Composition comprising a compound with two polymerizable groups, a multistage polymer and a thermoplastic polymer, its method of preparation, its use and article comprising it

[Field of the invention]

[001] The present invention relates to a composition comprising a compound with two polymerizable groups, a multistage polymer and a thermoplastic polymer its process of preparation and its use.

[002] In particular the present invention relates to a composition comprising a compound with two polymerizable groups, a multistage polymer in form of polymeric particles made by a multistage process and a (meth) acrylic polymer.

[003] More particularly the present invention relates to polymer composition comprising a compound with two polymerizable groups, polymeric particles made by a multistage process comprising at least two stages and a (meth) acrylic polymer, its method of preparation, its use for making impact modified polymer compositions, comprising thermosetting resins and compositions and articles comprising it.

[Technical problem]

[004] Many of today's articles are manufactured from polymeric materials or comprise polymers or polymeric compositions. These articles have to resist to mechanical stress during their use. So they have to be impact modified.

[005] One class of polymeric materials are thermoset polymers, which for example are used in adhesives or polymeric composites.

[006] Thermosetting polymers consist of crosslinked three dimensional structures. The crosslinking for example is obtained by curing reactive groups inside the so called prepolymer. Curing for example can be obtained by heating the polymer chains in order to crosslink and harden the material permanently.

[007] In order to prepare a polymeric thermoset composite material the prepolymer is mixed with the other component such as glass beads or fibres or the other component which is wetted or impregnated and cured afterwards. Example for prepolymers or matrix material for thermoset polymers are unsaturated polyesters, vinylesters, epoxy or phenolic ones.

[008] Thermosetting resins once cured have excellent properties in view of dimensional stability, mechanical strength, electrical insulating properties, heat resistance, water resistance and chemical resistance. Such thermosetting resins are for example epoxy resins or phenolic resins. However such cured resins have small fracture toughness and are brittle.

[009] In order to guarantee and obtain a satisfying mechanical performance over a large temperature range, the impact performance of the thermoset polymer matrix has to be increased.

[010] One form of impact modifiers are core-shell particles also called multistage polymers which are made by a multistage process, with at least stage comprising a rubber like polymer. Afterwards the particles are incorporated in the brittle polymer for composite material or the one of the phases for the structural adhesives, in order to increase the impact resistance of the finished product.

[ Oil ] However these kind of multistage polymers are not easy to disperse in all kind of resins or polymers or even monomers, especially in a homogeneous distribution and/or in small or large quantities at a reasonable time; for example in curable resins as unsaturated polyesters or vinylesters, but also other precursors of polymeric phases or monomers for composites and structural adhesives .

[012] A good homogeneous dispersion of the multistage polymer is necessary for having satisfying impact performance. The dispersion should also have a reasonable stability (pot life) .

[013] The objective of the present invention is to propose a composition suitable for preparing cured toughened thermoset polymers comprising a multistage polymer and a thermoplastic polymer, which is homogeneous and stable, while having a suitable viscosity for the required application.

[014] An additional objective of the present invention is also to provide a composition suitable for preparing cured thermoset polymers comprising a precursor of the thermoset polymer, a multistage polymer and a thermoplastic polymer, which can be easily and fast prepared.

[015] Another objective of the present invention is to propose a method for manufacturing a composition suitable for preparing cured thermoset polymers comprising a precursor of the thermoset polymer, a multistage polymer and a thermoplastic polymer, which is homogeneous and stable, while having a suitable viscosity for the required application.

[016] Still another objective of the present invention is a method for manufacturing a cured toughened polymer composition with satisfying impact properties.

[017] The objective of the present invention is to propose a process with reduced preparation time of a composition suitable for preparing cured thermoset polymers comprising a multistage polymer .

[018] Still an additional objective is to propose an impact modified cured polymer with satisfying impact properties or adhesive composition, with satisfying impact and adhesive strength properties .

[BACKGROUND OF THE INVENTION ]Prior art

[019] The document WO2016/102666 discloses a composition comprising a multistage polymer and its method of preparation. The composition comprises as well a (meth) acrylic polymer that has a mass average molecular weight of less than 100 OOOg/mol.

[020] The document WO2016/102682 discloses a multistage polymer composition and its method of preparation. The multistage polymer comprises a last stage that comprises a (meth) acrylic polymer that has a mass average molecular weight of less than 100 OOOg/mol .

[021] The document EP2441784A1 discloses a vinyl ester composition that contains polymer fine particles. The polymer fine particles are core shell polymers with a shell comprising aromatic vinyl monomers and vinyl cyan monomer.

[022] The document EP 1 632 533 describes a process for producing modified epoxy resin. The epoxy resin composition is having rubber like polymer particles dispersed in it by a process that brings the particles in contact with an organic medium that disperses the rubber particles .

[023] The document W02019/011984 discloses a resin composition. The resin composition comprises a resin system, a curative system and a particle system. The particle system is a multistage polymer.

[024] None of the prior art documents discloses a composition or a process as claimed.

[Brief description of the invention]

[025] Surprisingly it has been found that a composition (PCI) comprising

a) a multistage polymer (MP1) comprising

al) one stage (SA1) comprising a polymer (Al) having a glass transition temperature of less than 10°C

a2 ) one stage (SA2) comprising a polymer (A2) having a glass transition temperature of at least 60°C and b) a thermoplastic polymer (Bl) having a glass transition temperature of at least 30°C and

c) a component (LC1) comprising a compound (Cl) with at least two polymerizable groups (PG1) and (PG2),

characterized in that the polymer (Bl) has a mass average molecular weight Mw of between 10 OOOg/mol and 500 OOOg/mol and that the component b) represents at most 40wt% of a composition based on a) and b) only and the sum of components a) and b) is between 0.5phr and lOOphr for lOOphr of component c) ;

can be easily dispersed in the precursors for a polymeric matrix material for thermosetting polymers.

[026] Surprisingly it has also been found that a composition (PCI) comprising

a) a multistage polymer (MP1) comprising

al) one stage (SA1) comprising a polymer (Al) having a glass transition temperature of less than 10°C

a2 ) one stage (SA2) comprising a polymer (A2) having a glass transition temperature of at least 60°C and b) a thermoplastic polymer (Bl) having a glass transition temperature of at least 30°C and c) a component (LC1) comprising a compound (Cl) with at least two polymerizable groups (PG1) and (PG2),

characterized in that the polymer (Bl) has a mass average molecular weight Mw of between 10 OOOg/mol and 500 OOOg/mol and that the component b) represents at most 40wt% of a composition based on a) , and b) only and the sum of components a) and b) is between 0.5phr and lOOphr for lOOphr of component c) ;

has a good stability and stays homogeneous over a long period of time. By a long period of time at least 2 week at 23°C are meant, and by homogeneous is meant that no significant separation between the respective components takes place.

[027] Surprisingly it has also been found that a method for manufacturing a composition (PCI) comprising the steps of

i) providing a composition (Ci) comprising

a) a multistage polymer (MP1) comprising

al) one stage (SA1) comprising a polymer (Al) having a glass transition temperature of less than 10°C

a2 ) one stage (SA2) comprising a polymer (A2) having a glass transition temperature of at least 60°C and

b) a thermoplastic polymer (Bl) having a glass transition temperature of at least 30°C and a mass average molecular weight Mw of between 10 OOOg/mol and 500 OOOg/mol so that the component b) represents at most 40wt% of a composition based on a) and b) ; and

ii) mixing the composition (Ci) with a compostion (Ciia) comprising at least one other component or compound present in the composition (PCI); and

iii) optionally mixing the composition obtained in step ii) with the other components or compounds present in the composition (PCI) that have not been added yet in step ii) , allows to prepare stable and homogeneous compositions and allows as well to reduce preparation time of the composition (PCI) in comparison to a composition not comprising the component b) . [ 028 ] Surprisingly it has also been found that a method for manufacturing a composition (PCI) comprising the steps of

i) providing a polymeric composition comprising

a) a multistage polymer (MP1) comprising

al) one stage (SA1) comprising a polymer (Al) having a glass transition temperature of less than 10°C

a2 ) one stage (SA2) comprising a polymer (A2) having a glass transition temperature of at least 60°C and b) a thermoplastic polymer (Bl) having a glass transition temperature of at least 30 °C and a mass average molecular weight Mw of between 10 OOOg/mol and 500 OOOg/mol so that the component b) represents at most 40wt% of a composition based on a) and b) ,

ii) providing c) a component (LC1) comprising a compound (Cl) with at least two polymerizable groups (PG1) and (PG2),

iii) mixing the components a) , b) and c) in a ratio of sum of components a) and b) is between 0.5 and lOOphr for lOOphr of component c) ;

yields to a method with reduced preparation time of the composition (PCI) in comparison to a composition not comprising the component b) .

[ 029 ] Surprisingly it has also been found that the use of a thermoplastic polymer (Bl) having a glass transition temperature of at least 30°C and a mass average molecular weight Mw of between 10 OOOg/mol and 500 OOOg/mol in a composition (PCI) comprising

a) a multistage polymer (MP1) comprising

al) one stage (SA1) comprising a polymer (Al) having a glass transition temperature of less than 10°C

a2 ) one stage (SA2) comprising a polymer (A2) having a glass transition temperature of at least 60°C and b) said thermoplastic polymer (Bl) at most 40wt% of the composition based on a) and b),and

c) a component (LC1) comprising a compound (Cl) with at least two polymerizable groups (PG1) and (PG2),

and the sum of components a) and b) is between 0.5phr and lOOphr for lOOphr of component c) ; reduces the preparation time of the composition (PCI) in comparison to a composition not comprising the component b) .

[ 030 ] Surprisingly it has also been found that a method for manufacturing the polymer composition (PC2) comprising the steps of

i) providing a polymeric composition (Ci) comprising

a) a multistage polymer (MP1) comprising

al) one stage (SA1) comprising a polymer (Al) having a glass transition temperature of less than 10°C

a2 ) one stage (SA2) comprising a polymer (A2) having a glass transition temperature of at least 60°C and b) a thermoplastic polymer (Bl) having a glass transition temperature of at least 30°C and a mass average molecular weight Mw of between 10 OOOg/mol and 500 OOOg/mol so that the component b) represents at most 40wt% of a composition based on a) and b) ,

ii) providing a composition (Ciib) comprising c) a component

(LC1) comprising a compound (Cl) with at least two polymerizable groups (PG1) and (PG2),

iii) mixing the components a), b) and c) in a ratio of sum of components a) and b) is between 0.5phr and lOOphr for lOOphr of component c)

iv) polymerizing or curing the mixture.

yields polymer composition that has satisfying toughening and/or impact properties.

[ 031 ] Surprisingly it has also been found that a polymeric composition (PC2) comprising

a) a multistage polymer (MP1) comprising

al) one stage (SA1) comprising a polymer (Al) having a glass transition temperature of less than 10°C, a2 ) one stage (SA2) comprising a polymer (A2) having a glass transition temperature of at least 60°C and b) a thermoplastic polymer (Bl) having a glass transition temperature of at least 30°C and c) a polymer (P2) comprising units from a compound (Cl) with at least two polymerizable groups (PG1) and (PG2), characterized in that the polymer (Bl) has a mass average molecular weight Mw of between 10 OOOg/mol and 500 OOOg/mol and that the component b) represents at most 40wt% of a composition based on a) and b) only and the sum of components a) and b) is between 0.5phr and lOOphr for lOOphr of component c) ,

has satisfying toughening properties.

[Detailed description of the invention]

[ 032 ] According to a first aspect, the present invention relates to a composition (PCI) comprising

a) a multistage polymer (MP1) comprising

al) one stage (SA1) comprising a polymer (Al) having a glass transition temperature of less than 10°C

a2 ) one stage (SA2) comprising a polymer (A2) having a glass transition temperature of at least 60°C and

b) a thermoplastic polymer (Bl) having a glass transition temperature of at least 30°C and

c) a component (LC1) comprising a compound (Cl) with at least two polymerizable groups (PG1) and (PG2),

characterized in that the polymer (Bl) has a mass average

molecular weight Mw of between 10 OOOg/mol and 500 OOOg/mol and that the component b) represents at most 40wt% of a composition based on a) and b) only and the sum of components a) and b) is between 0.5phr and lOOphr for lOOphr of component c) .

[ 033 ] According to a second aspect, the present invention relates to a method for manufacturing a composition (PCI) comprising the steps of

i) providing a composition (Ci) comprising

a) a multistage polymer (MP1) comprising

al) one stage (SA1) comprising a polymer (Al) having a glass transition temperature of less than 10°C a2 ) one stage (SA2) comprising a polymer (A2) having a glass transition temperature of at least 60°C and b) a thermoplastic polymer (Bl) having a glass transition temperature of at least 30°C and a mass average molecular weight Mw of between 10 OOOg/mol and 500 OOOg/mol so that the component b) represents at most 40wt% of a composition based on a) and b) ; and

ii) mixing the composition (Ci) with a composition (Ciia) comprising at least one other component or compound present in the composition (PCI); and

iii) optionally mixing the composition obtained in step ii) with the other components or compounds present in the composition (PCI) that have not been added yet in step ii) .

[ 034 ] In a third aspect the present invention relates to a method for manufacturing a composition (PCI) comprising the steps of i) providing a polymeric composition (Ci) comprising

a) a multistage polymer (MP1) comprising

al) one stage (SA1) comprising a polymer (Al) having a glass transition temperature of less than 10°C

a2 ) one stage (SA2) comprising a polymer (A2) having a glass transition temperature of at least 60°C and b) a thermoplastic polymer (Bl) having a glass transition temperature of at least 30°C and a mass average molecular weight Mw of between 10 OOOg/mol and 500 OOOg/mol so that the component b) represents at most 40wt% of a composition based on a) and b) , ii) providing a composition (Ciib) comprising c) a component (LC1) comprising a compound (Cl) with at least two polymerizable groups (PG1) and (PG2),

iii) mixing the compositions (Ci) and (Ciib) comprising components a) , b) and c) in a ratio that the sum of components a) and b) is between 0.5phr and lOOphr for lOOphr of component c) .

[ 035 ] In a fourth aspect the present invention relates to a method for reducing the preparation time of a composition (PCI) comprising the steps of

i) providing a polymeric composition (Ci) comprising a) a multistage polymer (MP1) comprising

al) one stage (SA1) comprising a polymer (Al) having a glass transition temperature of less than 10°C

a2 ) one stage (SA2) comprising a polymer (A2) having a glass transition temperature of at least 60°C and b) a thermoplastic polymer (Bl) having a glass transition temperature of at least 30°C and a mass average molecular weight Mw of between 10 OOOg/mol and 500 OOOg/mol so that the component b) represents at most 40wt% of a composition based on a) and b) ,

ii) providing a composition (Ciib) comprising c) a component (LC1) comprising a compound (Cl) with at least two polymerizable groups (PG1) and (PG2),

iii) mixing the components a) , b) and c) in a ratio of sum of components a) and b) is between 0.5phr and lOOphr for lOOphr of component c) .

[036] In a fifth aspect the present invention relates to a polymeric composition (PC2) comprising

a) a multistage polymer (MP1) comprising

al) one stage (SA1) comprising a polymer (Al) having a glass transition temperature of less than 10°C, a2 ) one stage (SA2) comprising a polymer (A2) having a glass transition temperature of at least 60°C and b) a thermoplastic polymer (Bl) having a glass transition temperature of at least 30°C and

c) a polymer (P2) comprising units from a compound (Cl) with at least two polymerizable groups (PG1) and (PG2), characterized in that the polymer (Bl) has a mass average molecular weight Mw of between 10 OOOg/mol and 500 OOOg/mol and that the component b) represents at most 40wt% of a composition based on a) and b) only and the sum of components a) and b) is between 0.5phr and lOOphr for lOOphr of component c) .

[037] According to a sixth aspect, the present invention relates to the use of a composition (PCI) comprising

a) a multistage polymer (MP1) comprising al) one stage (SA1) comprising a polymer (Al) having a glass transition temperature of less than 10°C

a2 ) one stage (SA2) comprising a polymer (A2) having a glass transition temperature of at least 60°C and

b) a thermoplastic polymer (Bl) having a glass transition temperature of at least 30°C and

c) a component (LC1) comprising a compound (Cl) with at least two polymerizable groups (PG1) and (PG2),

characterized in that the polymer (Bl) has a mass average molecular weight Mw of between 10 OOOg/mol and 500 OOOg/mol and that the component b) represents at most 40wt% of a composition based on a) and b) only and the sum of components a) and b) is between 0.5phr and lOOphr for lOOphr of component c) ;

to prepare an impact modified polymeric composition (PC2) .

[038] By the term "polymer powder" as used is denoted a polymer comprising powder grain in the range of at least lpm obtained by agglomeration of primary polymer comprising particles in the nanometer range.

[039] By the term "primary particle" as used is denoted a spherical polymer particle comprising particle in the nanometer range. Preferably the primary particle has a weight average particle size between 50nm and 500nm.

[040] By the term "particle size" as used is denoted the volume average diameter of a particle considered as spherical.

[041] By the term "thermoplastic polymer" as used is denoted a polymer that turns to a liquid or becomes more liquid or less viscous when heated and that can take on new shapes by the application of heat and pressure. In the scope of the invention a thermoplastic polymer can also be crosslinked, if it still can thermoformed .

[042] By the term "thermosetting polymer" as used is denoted a polymer made from prepolymer in a soft, solid or viscous state

(for example oligomer having at least two reactive groups or a monomer or a mixture of both) that changes irreversibly into an infusible, insoluble polymer network by curing. [043] By the term "polymer composite" as used is denoted a multicomponent material comprising multiple different phase domains in which at least one type of phase domain is a continuous phase and in which at least one component is a polymer.

[044] By the term "copolymer" as used is denoted that the polymer consists of at least two different monomers.

[045] By "multistage polymer" as used is denoted a polymer formed in sequential fashion by a multi-stage polymerization process. Preferred is a multi-stage emulsion polymerization process in which the first polymer is a first-stage polymer and the second polymer is a second-stage polymer, i.e., the second polymer is formed by emulsion polymerization in the presence of the first emulsion polymer, with at least two stages that are different in composition .

[046] By the term " (meth) acrylic" as used is denoted all kind of acrylic and methacrylic monomers.

[047] By the term " (meth) acrylic polymer" as used is denoted that the (meth) acrylic) polymer comprises essentially polymers comprising (meth) acrylic monomers that make up 50wt% or more of the (meth) acrylic polymer.

[048] By the term "dry" as used is denoted that the ratio of residual water is less than 1.5wt and preferably less than 1.25wt% .

[049] By the term "total intruded volume" as used is denoted the total volume intruded by liquid mercury according to ISO 15901- 1:2016. This volume is cummulated and the analysis results show cumulated intruded volume in ml/g (cm ³ /g) as function of the applied pressure or the pore diameter. The total intruded volume is the volume intruded at the maximal applied pressure, which corresponds also to the smallest pores .

[050] By the term "incremental intrusion" as used is denoted the volume intruded in ml/g between two certain pressures or two pore sizes. This incremental intrusion can also be expressed relatively to the total intruded volume in vol% .

[051] By the term "phr" as used is denoted part per hundred by weight. For example lphr of compound A in view of compound B in the composition means that 1kg of compound A is added to 100kg or present in view of compound B.

[052] By saying that a range from x to y in the present invention, it is meant that the upper and lower limit of this range are included, equivalent to at least x and up to y.

[053] By saying that a range is between x and y in the present invention, it is meant that the upper and lower limit of this range are excluded, equivalent to more than x and less than y.

[054] With regard to composition (PCI) according to the invention, it is preferably a polymeric composition.

[055] The polymeric composition (PCI) comprises a) a multistage polymer (MP1), b) a thermoplastic polymer (Bl) and c) a component (LC1) comprising a compound (Cl) with at least two polymerizable groups (PG1) and (PG2), characterized in that the polymer (Bl) has a mass average molecular weight Mw of between 10 OOOg/mol and 500 OOOg/mol and that the component b) represents at most 40wt% of a composition based on a) , and b) only and the sum of components a) and b) is between 0.5phr and lOOphr for lOOphr of component c) .

[056] The multistage polymer (MP1) comprises al) one stage (SA1) comprising a polymer (Al) having a glass transition temperature of less than 10°C and a2 ) one stage (SA2) comprising a polymer (A2) having a glass transition temperature of at least 60°C.

[057] The thermoplastic polymer (Bl) having a glass transition temperature of at least 30°C.

[058] The component b) of the composition (PCI) represents at most 40wt% of a composition based on a) and b) only. The composition based on a) and b) only is referred to as composition (Ci) . Preferably the component b) of the composition (Ci) represents at most 35wt% of the composition based on a) and b) only; more preferably at most 30wt%, still more preferably less than 30wt%, advantageously less than 25wt% and more advantageously less than 20wt% .

[059] The component b) of the composition (Ci) represents more than 0.5wt% of a composition based on a) and b) only. Preferably the component b) of the composition (Ci) represents more than lwt% of the composition based on a) and b) only; more preferably more than 2wt%, still more preferably more than 4wt%, advantageously more than 8wt% and more advantageously more than 10wt%.

[060] The component b) represents between 0.5wt% and 40wt% of a composition based on a) and b) only. Preferably the component b) represents between 5wt% and 35wt% of the composition based on a) and b)only; more preferably between 6wt% and 30wt%, still more preferably between 7wt% and less than 30wt%, advantageously between 7wt% and less than 25wt% and more advantageously between 10wt% and less than 20wt%.

[061] At least the component a) of composition (PCI) or composition (Ci) is part of a multistage polymer (MP1) .

[062] At least the component a) is obtained by a multistage process comprising at least two stages (SA1) and (SA2); and two polymers (Al) and (A2) form the multistage polymer (MP1) .

[063] In the composition (PCI) the sum of components a) and b) is between 0.5phr and lOOphr for lOOphr of component c) . Preferably the sum of components a) and b) is between lphr and lOOphr for lOOphr of component c) .

[064] In a first more preferred embodiment of the composition (PCI) the sum of components a) and b) is between lphr and 50phr for lOOphr of component c) , still more preferably between lphr and 25phr, even more preferably between lphr and 20phr and advantageously between lphr and 15phr.

[065] In a second more preferred embodiment of the composition (PCI) the sum of components a) and b) is between 2phr and lOOphr for lOOphr of component c) , still more preferably between 5phr and lOOphr, even more preferably between lOphr and lOOphr and advantageously between 15phr and lOOphr.

[066] In a third more preferred embodiment of the composition (PCI) the sum of components a) and b) is between 15phr and lOOphr for lOOphr of component c) , still more preferably between 17phr and lOOphr, even more preferably between 19phr and lOOphr and advantageously between 21phr and lOOphr.

[067] In a fourth more preferred embodiment of the composition (PCI) the sum of components a) and b) is between 20phr and lOOphr for lOOphr of component c) , still more preferably between 30phr and lOOphr, even more preferably between 40phr and lOOphr and advantageously between 50phr and lOOphr.

[068] In one embodiment the composition (PCI) is liquid. In that case, the viscosity of the composition (PCI) is between lmPa*s and 1000Pa*s. The viscosity is measured at 25°C. The viscosity is the dynamic viscosity. If there should be shear thinning the value of the dynamic viscosity is taken at a shear rate of 1 1/s. The viscosity is measured with a rheometer.

[069] Preferably the viscosity of the liquid composition (PCI) is between 5mPa*s and 900Pa*s, more preferably between 10mPa*s and 800Pa*s at a temperature of 25 °C and a shear rate of 1 1/s.

[070] The multistage polymer (MP1) of the composition (PCI) according to the invention has at least two stages (SA1) and (SA2) comprising the polymer (Al) and (A2) respectively, that are different in its respective polymer composition.

[071] The multistage polymer (MP1) is preferably in form of polymeric particles considered as spherical particles. These particles are also called core/shell particles. The first stage (SA1) forms the core, the second stage (SA2) the shell. Optionally all following stages form additional respective shells . Such a multistage polymer (MP1) which is also called core/shell particle is preferred.

[072] The core/shell particles have a weight average particle size (diameter) between 15nm and 900nm. Preferably the weight average particle size of the polymer is between 20nm and 800nm, more preferably between, more preferably between 25nm and 600nm, still more preferably between 30nm and 550nm, again still more preferably between 35nm and 500nm, advantageously between 40nm and 400nm, even more advantageously between 75nm and 350nm and advantageously between 80nm and 300nm. The polymer core/shell particles itself can be agglomerated giving a polymer powder comprising many of such polymer core/shell particles.

[073] The multistage polymer (MP1) has a multilayer structure comprising at least one stage (SA1) comprising a polymer (Al) having a glass transition temperature less than 10°C, at least one stage (SA2) comprising a polymer (A2) having a glass transition temperature over 60°C.

[074] In an optional variation, the multistage polymer (MP1) can also already comprise a stage (SB1) comprising the polymer (Bl) having a glass transition temperature over 30 °C. In this optional variation, the component b) of the composition (Ci) is combined with the component a) of the composition of the invention. This variation is more detailed explained in the process part.

[075] Preferably the stage (SA1) is the first stage of the at least two stages and the stage (SA2) comprising polymer (A2) is grafted on stage (SA1) comprising polymer (Al) or another optional intermediate layer.

[076] In a further variation there could also be another stage before stage (SA1), so that stage (SA1) would also be a kind of shell, for example on a seed.

[077] In a first embodiment the polymer (Al) having a glass transition temperature of less than or below 10°C comprises at least 50wt% of polymeric units coming from alkyl acrylate and the stage (SA1) is the most inner layer of the multistage polymer (MP1) or the polymer particle having the multilayer structure. In other words the stage (SA1) comprising the polymer (Al) is the core of the multistage polymer (MP1) or the polymer particle.

[078] With regard to the polymer (Al) of the first preferred embodiment, it is a (meth) acrylic polymer comprising at least 50wt% of polymeric units coming from acrylic monomers. Preferably 60wt% and more preferably 70wt% of the polymer (Al) are acrylic monomers .

[079] The acrylic momonomer units in polymer (Al) comprises monomers chosen from Cl to C18 alkyl acrylates or mixtures thereof. More preferably acrylic monomer in polymer (Al) comprises monomers of C2 to C12 alkyl acrylic monomers or mixtures thereof Still more preferably acrylic monomer in polymer (Al) comprises monomers of C2 to C8 alkyl acrylic monomers or mixtures thereof.

[080] The polymer (Al) can comprise a comonomer or comonomers which are copolymerizable with the acrylic monomer, as long as polymer (Al) is having a glass transition temperature of less than 10°C.

[081] The comonomer or comonomers in polymer (Al) are preferably chosen from (meth) acrylic monomers and/or vinyl monomers.

[082] Most preferably the acrylic or methacrylic comonomers of the polymer (Al) are chosen from methyl acrylate, propyl acrylate, isopropyl acrylate, butyl acrylate, tert-butyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate and mixtures thereof, as long as polymer (Al) is having a glass transition temperature of less than 10 °C.

[083] In a specific embodiment the polymer (Al) is a homopolymer of butyl acrylate .

[084] More preferably the glass transition temperature Tg of the polymer (Al) comprising at least 70wt% of polymeric units coming from C2 to C8 alkyl acrylate is between -100°C and 10°C, even more preferably between -80°C and 0°C and advantageously between -80°C and -20°C and more advantageously between -70°C and -20°C.

[085] In a second preferred embodiment the polymer (Al) having a glass transition temperature below 10°C comprises at least 50wt% of polymeric units coming from isoprene or butadiene and the stage (A) is the most inner layer of the polymer particle having the multilayer structure. In other words the stage (SA1) comprising the polymer (Al) is the core of the polymer particle.

[086] By way of example, the polymer (Al) of the core of the second embodiment, mention may be made of isoprene homopolymers or butadiene homopolymers, isoprene-butadiene copolymers, copolymers of isoprene with at most 98 wt% of a vinyl monomer and copolymers of butadiene with at most 98 wt% of a vinyl monomer. The vinyl monomer may be styrene, an alkylstyrene, acrylonitrile, an alkyl (meth) acrylate, or butadiene or isoprene. In a preferred embodiment the core is a butadiene homopolymer.

[087] More preferably the glass transition temperature Tg of the polymer (Al) comprising at least 50wt% of polymeric units coming from isoprene or butadiene is between -100°C and 10°C, even more preferably between -90°C and 0°C, advantageously between -85°C and 0°C and most advantageously between -80°C and -20°C. [088] In a third preferred embodiment the polymer (Al) is a silicone rubber based polymer. The silicone rubber for example is polydimethyl siloxane. More preferably the glass transition temperature Tg of the polymer (Al) of the second embodiment is between -150°C and 0°C, even more preferably between -145°C and - 5°C, advantageously between -140°C and -15°C and more advantageously between -135°C and -25°C.

[089] With regard to the polymer (A2) , mention may be made of homopolymers and copolymers comprising monomers with double bonds and/or vinyl monomers. Preferably the polymer (A2) is a (meth) acrylic polymer, comprises more than 50wt% monomer units coming from (meth) acrylic monomers and optionally commoners that are (meth) acrylic monomers as styrene commoners, for example styrene.

[090] Preferably the polymer (A2) comprises at least 70wt% monomers chosen from Cl to C12 alkyl (meth) acrylates . Still more preferably the polymer (A2) comprises at least 80wt% of monomers Cl to C4 alkyl methacrylate and/or Cl to C8 alkyl acrylate monomers.

[091] Most preferably the acrylic or methacrylic monomers of the polymer (A2) are chosen from methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate and mixtures thereof, as long as polymer (A2) is having a glass transition temperature of at least 60°C.

[092 ] Advantageously the polymer (A2) comprises at least 70wt% of monomer units coming from methyl methacrylate.

[093] Preferably the glass transition temperature Tg of the polymer (A2) is between 60°C and 150°C. The glass transition temperature of the polymer (A2) is more preferably between 80°C and 150°C, advantageously between 90°C and 150°C and more advantageously between 100°C and 150°C.

[094] Preferably the polymer (A2) of the multistage polymer (MP1) is grafted on the polymer (Al) made in the previous stage.

[095] In certain embodiments the polymer (A2) is crosslinked.

[096] In one embodiment the polymer (A2) comprises a functional comonomer. The functional copolymer is chosen from acrylic or methacrylic acid, the amides derived from this acids, such as for example dimethylacrylamide, 2-methoxy-ethyl acrylate or methacrylate, 2-aminoethyl acrylate or methacrylate which are optionally quaternized, polyethylene glycol (meth) acrylates, water soluble vinyl monomers such as N-vinyl pyrrolidone or mixtures thereof. Preferably the polyethylene glycol group of polyethylene glycol (meth) acrylates has a molecular weight ranging from 400g/mol to 10 000 g/mol.

[097] With regard to the thermoplastic polymer (Bl) , it has a mass average molecular weight Mw of between 10 OOOg/mol and 500 OOOg/mol.

[098] The thermoplastic polymer (Bl) has a mass average molecular weight Mw of more than 10 OOOg/mol, preferably more than 10 500g/mol, more preferably more than 11 OOOg/mol, still more preferably more than 12 OOOg/mol, advantageously more than 13 000 g/mol, more advantageously more than 14 000 g/mol and still more advantageously more than 15 000 g/mol.

[099] The thermoplastic polymer (Bl) has a mass average molecular weight Mw below 500 OOOg/mol, preferably below 450 OOOg/mol, more preferably below 400 OOOg/mol, still more preferably below 400 OOOg/mol, advantageously below 350 000 g/mol, more advantageously below 300 000 g/mol and still more advantageously below 250 000 g/mol and most advantageously below 200 000 g/mol.

[0100] Preferably the mass average molecular weight Mw of polymer (Bl) is between 10 500g/mol and 450 OOOg/mol, more preferable between 11 000 g/mol and 400 000 g/mol and even more preferably between 12 OOOg/mol and 350 OOOg/mol advantageously between 13 OOOg/mol and 300 OOOg/mol, more advantageously between

14 OOOg/mol and 250 OOOg/mol and most advantageously between

15 OOOg/mol and 200 OOOg/mol.

[0101] In a first more preferred embodiment the mass average molecular weight Mw of polymer (Bl) is between 15 OOOg/mol and 300 OOOg/mol, more preferable between 15 000 g/mol and 200 000 g/mol and even more preferably between 15 OOOg/mol and 190 OOOg/mol advantageously between 15 OOOg/mol and 180 OOOg/mol, more advantageously between 15 OOOg/mol and 160 OOOg/mol and most advantageously between 15 OOOg/mol and 150 OOOg/mol. [0102] In a second more preferred embodiment the mass average molecular weight Mw of polymer (Bl) is between 15 OOOg/mol and 450 OOOg/mol, more preferable between 18 000 g/mol and 400 000 g/mol and even more preferably between 20 OOOg/mol and 350 OOOg/mol advantageously between 22 OOOg/mol and 300 OOOg/mol, more advantageously between 25 OOOg/mol and 250 OOOg/mol and most advantageously between 30 OOOg/mol and 200 OOOg/mol.

[0103] Preferably the polymer (Bl) is a copolymer comprising (meth) acrylic monomers. More preferably the polymer (Bl) is a (meth) acrylic polymer. Still more preferably the polymer (Bl) comprises at least 70wt% monomers chosen from Cl to C12 alkyl (meth) acrylates . Advantageously the polymer (Bl) comprises at least 80wt% of monomers Cl to C4 alkyl methacrylate and/or Cl to C8 alkyl acrylate monomers.

[0104] Preferably the glass transition temperature Tg of the polymer (Bl) is between 30°C and 150°C. The glass transition temperature of the polymer (Bl) is more preferably between 40°C and 150°C, advantageously between 45°C and 150°C and more advantageously between 50°C and 150°C.

[0105] Preferably the polymer (Bl) is not crosslinked.

[0106] Preferably the polymer (Bl) is not grafted on any of the polymers (Al) or (A2), if it is part of the multistage polymer. This means that the monomer or monomers used for the preparation of the polymer (Bl) do not comprise a crosslinker or a graft crosslinker. It cannot be excluded that nevertheless a part of polymer (Bl) is linked to the polymers of previous stages. Either due to reactive groups from crosslinking or grafting still present from previous stage or through entanglement for polymer chains. The polymer (Bl) can be, at least partly, recovered by extraction with a solvent.

[0107] The mass average molecular weight Mw of the polymer (Bl) is measured with by size exclusion chromatography (SEC) . If the polymer (Bl) is part of the multistage polymer, it can be extracted with a solvent an its molecular weight measured; Alternatively the polymer (Bl) can be synthesized under the same conditions without the presence of the previous stage, and a "pure" polymer (Bl) is obtained for measuring, while avoiding extraction step.

[0108] In one embodiment the polymer (Bl) comprises also a functional comonomer.

[0109] The functional comonomer has the formula (1)

[0110] wherein Ri is chosen from H or CH ₃ and R ₂ is H or an aliphatic or aromatic radical having at least one atom that is not C or H.

[0111] Preferably the functional monomer is chosen from glycidyl (meth) acrylate , acrylic or methacrylic acid, the amides derived from these acids, such as, for example, dimethylacrylamide, 2- methoxyethyl acrylate or methacrylate, 2-aminoethyl acrylates or methacrylates are optionally quaternized, polyethylene glycol (meth) acrylates. Preferably the polyethylene glycol group of polyethylene glycol (meth) acrylates has a molecular weight ranging from 400g/mol to 10 000 g/mol.

[0112] In a first preferred embodiment the polymer (Bl) comprises from 80wt% to 100wt% methyl methacrylate, preferably from 80wt% to 99.9wt% methyl methacrylate and from 0. lwt% to 20wt% of a Cl to C8 alkyl acrylate monomer. Advantageously the Cl to C8 alkyl acrylate monomer is chosen from methyl acrylate, ethyl acrylate or butyl acrylate .

[0113] In a second preferred embodiment the polymer (Bl) comprises between 0wt% and 50wt% of a functional monomer. Preferably the meth) acrylic polymer (Bl) comprises between 0wt% and 30wt% of the functional monomer, more preferably between lwt% and 30wt%, still more preferably between 2wt% and 30wt%, advantageously between 3wt% and 30wt%, more advantageously between 5wt% and 30wt% and most advantageously between 5wt% and 30wt%.

[0114] Preferably the functional monomer of the second preferred embodiment is a (meth) acrylic monomer. The functional monomer has the formula (2) or (3)

[0115] wherein in both formulas (2) and (3) Ri is chosen from H or CH ₃ ; and in formula (2) Y is O, R ₅ is H or an aliphatic or aromatic radical having at least one atom that is not C or H; and in formula (3) Y is N and R ₄ and/or R ₃ is H or an aliphatic or aromatic radical.

[0116] Preferably the functional monomer (2) or (3) is chosen from glycidyl (meth) acrylate, acrylic or methacrylic acid, the amides derived from these acids, such as, for example, dimethylacrylamide, 2-methoxyethyl acrylate or methacrylate, 2- aminoethyl acrylates or methacrylates are optionally quaternized, acrylate or methacrylate monomers comprising a phosphonate or phosphate group, alkyl imidazolidinone (meth) acrylates, polyethylene glycol (meth) acrylates. Preferably the polyethylene glycol group of polyethylene glycol (meth) acrylates has a molecular weight ranging from 400g/mol to 10 000 g/mol

[0117] The multistage polymer (MP1) or core/shell polymer particle is obtained by a multistage process comprising at least two stages. At least the components al) and the component a2) of composition (PCI) are part of a multistage polymer (MP1) .

[0118] Preferably the polymer (Al) having a glass transition temperature below 10°C made during the stage (SA1), is made before stage (SA2) or is the first stage of the multistage process.

[0119] Preferably the polymer (A2) having a glass transition temperature over 60°C made during the stage (SA2) is made after the stage (SA1) of the multistage process.

[0120] In a first preferred embodiment the thermoplastic polymer

(Bl) having a glass transition temperature of at least 30°C is made by a process to give polymeric particles of the polymer (Bl) . The weight average particle size (diameter) of these particles of polymer (Bl) is between 15nm and 900nm. Preferably the weight average particle size of the particles of polymer (Bl) is between 20nm and 800nm, more preferably between, more preferably between 25nm and 600nm, still more preferably between 30nm and 550nm, again still more preferably between 35nm and 500nm, advantageously between 40nm and 400nm, even more advantageously between 75nm and 350nm and advantageously between 80nm and 300nm. The polymer particles itself can be agglomerated together with the multistage polymer (MP1) particles giving the polymer powder comprising many of both such polymer particles. This yield to the composition (Ci) comprising the components a) and b) .

[0121] In a second preferred embodiment the polymer (Bl) having a glass transition temperature of at least 30°C is the external layer of the polymer particle having the multilayer structure in other words of the multistage polymer (MP1) .

[0122] The polymer (Bl) having a glass transition temperature over 30°C made during the stage (SB1), is made after the stage (SA2) of the multistage process. There could be additional intermediate stages, either between stage (SA1) and stage (SA2) and/or between stage (SA2) and stage (SB1) . This yields also to the composition (Ci) comprising the components a) and b) .

[0123] At least a part of the polymer (Bl) could be grafted on the polymer made in the previous layer or entangled with polymer chains of previous layer. If there are only two stages (SA1) and (SA2) comprising polymer (Al) and (A2) respectively, a part of polymer (Bl) could be grafted on polymer (A2) or entangled with the chains of polymer (A2) .

[0124] In one embodiment, at least 50wt% of polymer (Bl) is grafted .

[0125] In another embodiment, less than 50wt% of polymer (Bl) is grafted .

[0126] In still another embodiment, less than 20wt% of polymer (Bl) is grafted. [0127] In still another embodiment, between 5wt% and 60wt% of polymer (Bl) is grafted.

[0128] In still another embodiment, less than 5wt% of polymer (Bl) is grafted.

[0129] In still another embodiment, 0wt% of polymer (Bl) is grafted

[0130] The ratio of grafting can be determined by extraction with a solvent for the polymer (Bl) and gravimetric measurement before and after extraction to determine the non-grafted quantity.

[0131] The polymer (Bl) and the polymer (A2) are not the same polymer, even if their composition could be very close and some of their characteristics are overlapping. The essential difference is that the polymer (A2 ) is always part of the multistage polymer (MP1) . As explained earlier, there are embodiments, where the polymer (Bl) can also be part of the multistage polymer, however the polymer (Bl) is not voluntary grafted on the multistage polymer (MP1 ) .

[0132] The glass transition temperature Tg of the respective polymers can be estimated for example by dynamic methods as thermo mechanical analysis.

[0133] In order to obtain a sample of the respective polymers (Al) and (A2) they can be prepared alone, and not by a multistage process, for estimating and measuring more easily the glass transition temperature Tg individually of the respective polymers of the respective stages. The polymer (Bl) can be extracted for estimating and measuring the glass transition temperature Tg easier .

[0134] With regard to the component (LC1) of the composition (PCI) , it is preferably a liquid.

[0135] The viscosity is between 0.5mPa*s and 10Pa*s at 25°C. Preferably the viscosity is between lmPa*s and 10Pa*s, more preferably between 10mPa*s and 10Pa*s, even more preferably between 50mPa*s and 10Pa*s and advantageously between 100mPa*s and 10Pa*s. The viscosity of (LCl)is the dynamic viscosity. If there should be shear thinning the value of the dynamic viscosity is taken at a shear rate of 1 1/s. The viscosity is measured with a rheometer .

[0136] The component (LC1) can also be a mixture of several compounds, one of them being the compound (Cl) with at least two polymerizable groups (PG1) and (PG2) .

[0137] The component (LC1) or liquid component (LC1) can additionally comprise a monomer (Ml) or a mixture of monomers (Mx) . The monomer (Ml) or the mixture of monomers (Mx) comprise at least one carbon double bond.

[0138] The monomer (Ml) can be chosen from (meth) acrylic monomers, allyl monomers or styrenic monomers or mixtures thereof for (Mx) .

[0139] In a variation monomer (Ml) can be chosen from (meth) acrylic monomers, allyl monomers or mixtures thereof for (Mx) .

[0140] Preferably the monomer (Ml) is chosen from styrene, oi- methylstyrene, vinyltoluene, divinylbenzene, alkyl

(meth) acrylates that have an alkyl group containing 1 to 10 carbon atoms, and hydroxyethyl (meth) acrylate, as well as bifunctional (meth) acrylates such as butanediol di (meth) acrylate, 1, 6- hexanediol di (meth) acrylate and di (meth) acrylates having a glycol structure, and polyfunctional (meth) acrylates such as trimethylolpropane tri (meth) acrylate.

[0141] In a first more preferred embodiment the monomer (Ml) is chosen from alkyl (meth) acrylates that have an alkyl group containing 1 to 10 carbon atoms, and hydroxyethyl (meth) acrylate, as well as bifunctional (meth) acrylates such as butanediol di

(meth) acrylate, 1, 6-hexanediol di (meth) acrylate and di (meth) acrylates having a glycol structure, and polyfunctional (meth) acrylates such as trimethylolpropane tri (meth) acrylate.

[0142] In a second more preferred embodiment the monomer (Ml) or mixtures thereof for (Mx) comprises no styrene.

[0143] In a third more preferred embodiment the monomer (Ml) or mixtures thereof for (Mx) comprises no styrene based monomers.

[0144] The two polymerizable groups (PG1) and (PG2) of compound

(Cl) are preferably carbon double bonds.

[0145] The two polymerizable groups (PG1) and (PG2) of compound

(Cl) are more preferably a, b-unsaturated carbonyl groups. [0146] The two polymerizable groups (PG1) and (PG2) of compound (Cl) can be chosen from an acrylate group, a methacylate group or a condensation product comprising maleic acid or itaconic acid or fumaric acid.

[0147] Preferably the compound (Cl) is a vinyl ester or an unsaturated polyester

[0148] In a first more preferred embodiment the compound (Cl) is a vinyl ester. The vinyl ester is typically a reaction product obtainable by reacting a polyepoxide (such as an epoxy resin) with an ethylenically unsaturated double bond-containing monocarboxylic acid as (meth) acrylic acid for example, it has the same backbone as the polyepoxide in a main chain thereof, and is curable due to the presence of unsaturated double bonds in a molecule thereof. The backbone is preferably one or more types of backbones selected from the group consisting of backbones of bisphenol A, bisphenol F, phenol novolak, cresol novolak, hydrogenated bisphenol A, hydrogenated bisphenol F, aliphatic ester, aliphatic ether, and aromatic ester types .

[0149] In a second more preferred embodiment the compound (Cl) is an unsaturated polyester. The unsaturated polyester is a reaction product of at least one dibasic organic acid or its anhydride and at least one polyhydric alcohol.

[0150] Optionally the component (LC1) can comprise an initiator for radical polymerization. For example, an organic peroxide may be added .

[0151] The present invention relates also to a method for manufacturing a composition (PCI).

[0152] With regard to a first preferred method for manufacturing the composition (PCI) according to the invention it comprises the steps of

i) providing a composition (Ci) comprising

a) a multistage polymer (MP1) comprising

al) one stage (SA1) comprising a polymer (Al) having a glass transition temperature of less than 10°C a2 ) one stage (SA2) comprising a polymer (A2) having a glass transition temperature of at least 60°C and b) a thermoplastic polymer (Bl) having a glass transition temperature of at least 30 °C and a mass average molecular weight Mw of between 10 OOOg/mol and 500 OOOg/mol so that the component b) represents at most 40wt% of a composition based on a) and b) ; and

ii) mixing the composition (Ci) with a composition (Ciia) comprising at least one other component or compound present in the composition (PCI); and

iii) optionally mixing the composition obtained in step ii) with the other components or compounds present in the composition (PCI) that have not been added yet in step ii) .

[0153] The composition (Ciia) can comprise:

- a polyepoxide or

- a polyepoxid and organic acid with a doublebond or

- a vinylester or

- a vinylester and monomer (Ml) or the mixture of monomers (Mx)

- unsaturated polyester or

- unsaturated polyster and monomer (Ml) or the mixture of monomers (Mx) .

[0154] The other components or compounds that are optionally added in step iii) are monomer (Ml) or the mixture of monomers (Mx) or initiator for polymerization. The monomer (Ml) or the mixture of monomers (Mx) are added in step iii) if they not have been added in step ii, because they were not present in the composition (Ciia) or additional monomer (Ml) or the mixture of monomers (Mx) are added in step iii) when they were present in the composition (Ciia) of step ii) .

[0155] In a first preferred embodiment, the composition (Ciia) comprises a polyepoxide.

[0156] In a second preferred embodiment, the composition (Ciia) comprises polyepoxid and organic acid with a double bond.

[0157] In a third preferred embodiment, the composition (Ciia) comprises a vinylester. [0158] In a fourth preferred embodiment, the composition (Ciia) comprises a vinylester and monomer (Ml) or the mixture of monomers (Mx) .

[0159] In a fifth preferred embodiment, the composition (Ciia) comprises an unsaturated polyester.

[0160] In a sixth preferred embodiment, the composition (Ciia) comprises an unsaturated polyester and monomer (Ml) or the mixture of monomers (Mx) .

[0161] The steps ii) and iii) of the first preferred method for manufacturing the composition (PCI) will add and form the compound (Cl) with at least two polymerizable groups (PG1) and (PG2), if

[0162] Preferably the steps i) to iii) are made in the indicated order .

[0163] With regard to a second preferred method for manufacturing the composition (PCI) according to the invention it comprises the steps of

i) providing a composition (Ci) comprising

a) a multistage polymer (MP1) comprising

al) one stage (Al) comprising a polymer (Al) having a glass transition temperature of less than 10°C

a2 ) one stage (A2) comprising a polymer (A2) having a glass transition temperature of at least 60°C and

b) a thermoplastic polymer (Bl) having a glass transition temperature of at least 30 °C and a mass average molecular weight Mw of between 10 OOOg/mol and 500 OOOg/mol so that the component b) represents at most 40wt% of a composition based on a) and b) ; and

ii) providing a composition (Ciib) comprising c) a component (LC1) comprising a compound (Cl) with at least two polymerizable groups (PG1) and (PG2) or a precursor or the precursors for compound (Cl),

iii) mixing the composition from i) with a composition from ii) .

[0164] The composition (Ciib) can comprise:

- a polyepoxide or

- a polyepoxid and organic acid with a doublebond or

- a vinylester or - a vinylester and monomer (Ml) or the mixture of monomers

(Mx)

- unsaturated polyester or

- unsaturated poleyster and monomer (Ml) or the mixture of monomers (Mx) .

[0165] The second preferred method for manufacturing the composition (PCI) can also comprising the optional additional step iv) of adding other components or compounds .

[0166] Preferably the steps i) to iii) are made in the indicated order .

[0167] In a first preferred embodiment, the composition (Ciib) comprises a polyepoxide.

[0168] In a second preferred embodiment, the composition (Ciib) comprises polyepoxid and organic acid with a double bond,

[0169] In a third preferred embodiment, the composition (Ciib) comprises a vinylester.

[0170] In a fourth preferred embodiment, the composition (Ciib) comprises a vinylester and monomer (Ml) or the mixture of monomers (Mx) .

[0171] In a fifth preferred embodiment, the composition (Ciib) comprises an unsaturated polyester.

[0172] In a sixth preferred embodiment, the composition (Ciib) comprises an unsaturated polyester and monomer (Ml) or the mixture of monomers (Mx) .

[0173] With regard to a third preferred method for a method for manufacturing a composition (PCI) according to the invention it comprises the steps of

i) providing a polymeric composition comprising

a) a multistage polymer (MP1) comprising

al) one stage (SA1) comprising a polymer (Al) having a glass transition temperature of less than 10°C

a2 ) one stage (SA2) comprising a polymer (A2) having a glass transition temperature of at least 60°C and b) a thermoplastic polymer (Bl) having a glass transition temperature of at least 30°C, ii) providing c) a component (LC1) comprising a compound (Cl) with at least two polymerizable groups (PG1) and (PG2),

iii) mixing the components a) , b) and c) .

[0174] The compound (Cl) is a polyepoxide, a vinylester or an unsaturated polyester.

[0175] In a first preferred embodiment, the compound (Cl) is a polyepoxide .

[0176] In a second preferred embodiment, the compound (Cl) is a vinylester .

[0177] In a third preferred embodiment, the compound (Cl) is an unsaturated polyester.

[0178] In more preferred embodiment, the compound (Cl) is a vinylester .

[0179] The mixing of the respective components of all embodiments can be made by agitation. The agitation is made with a stirrer.

[0180] The important condition of the mixing step is the temperature. Preferably, the temperature of the mixing step is between 0°C and 50°C, more preferably between 5°C and 45°C, even more preferably between 10°C and 40°C, most preferably between 10°C and 35°C and advantageously between 10°C and 30°C.

[0181] The time required for the mixing step is less than compared to a composition not comprising the thermoplastic polymer (Bl) having a glass transition temperature of at least 30°C

[0182] The mixing time is preferably less than 120min and advantageously less than 90min (lab scale) . This parameter is influenced by the used quantities. For the same ratio of components, the time can be shorter if less absolute over all quantities are used.

[0183] The different processes for manufacturing the composition (PCI) preferably uses a multistage polymer (MP1) or composition (Ci) in form of a polymer powder POW1 which is having a total intruded volume of at least 1.2 ml/g as measured by mercury porosimetry . [0184] The porosity of the polymer powder POW1 is expressed as total intruded volume or total cuumulative intrusion (cumulative intruded volume) in millilitre (ml) of mercury per mass (g) of said polymer powder POW1. This is measured according to the norm ISO 15901-1: Evaluation of pore size distribution and porosity of solid materials by mercury porosity and gas adsorption - Part 1: mercury porosity. The total cumulative intrusion is taken into account until a pore size diameter of 0.005pm.

[0185] The polymer powder POW1 has a total intruded volume or total cumulative intrusion of at most lOml/g. Preferably the polymer powder POW1 of the invention has a total intruded volume or total cumulative intrusion between 1.2ml/g and lOml/g.

[0186] The incremental intrusion (incremental intruded volume) is the volume between two certain pore diameters. The incremental intrusion can be expressed as an absolute value also in ml/g or as a relative value es percentage of total intruded volume or total cumulative intrusion. Preferably the polymer powder POW1 has a relative incremental intrusion for a pore size above lOpm (larger than lOpm) of at most 85%. Preferably the polymer powder POW1 has a cumulative intrusion for a pore size above lOpm (larger than lOpm) of at least 0.9ml/g.

[0187] The present invention relates also to the use of the composition (PCI) . The composition (PCI) is used to prepare a toughened polymeric composition (PC2) .

[0188] The polymeric composition (PC2) is prepared by polymerizing the compound (Cl) with at least two polymerizable groups (PG1) and (PG2) of the component (LC1) . After the polymerizing the compound (Cl) the polymer (P2) is obtained.

[0189] The present invention relates to a polymeric composition (PC2) comprising

a) a multistage polymer (MP1) comprising

al) one stage (SA1) comprising a polymer (Al) having a glass transition temperature of less than 10°C, a2 ) one stage (SA2) comprising a polymer (A2) having a glass transition temperature of at least 60°C and b) a thermoplastic polymer (Bl) having a glass transition temperature of at least 30°C and

c) a polymer (P2) comprising units from a compound (Cl) with at least two polymerizable groups (PG1) and (PG2), characterized in that the polymer (Bl) has a mass average molecular weight Mw of between 10 OOOg/mol and 500 OOOg/mol and that the component b) represents at most 40wt% of a composition based on a) , and b) only and the sum of components a) and b) is between 0.5 and lOOphr for lOOphr of component c) .

[0190] The polymer (P2) is a thermoset polymer.

[0191] The polymeric composition (PC2) can comprise optionally other components as fibers or mineral fillers. Preferably the other components of the polymeric composition (PC2) are chosen from fibers or mineral fillers. In that case the polymeric composition (PC2) is a polymeric composite.

[0192] The polymeric composition (PC2) can be used as an adhesive and more preferably a structural adhesive or in a polymeric composite; or in applications as coating, decorative casting, flooring, polymer concrete, solid surfaces, artificial marble, or in marine applications, building and construction, wind energy applications .

[Methods of evaluation]

[0193] Glass transition Temperature

The glass transitions (Tg) of the polymers are measured with equipment able to realize a thermo mechanical analysis. A RDAII "RHEOMETRICS DYNAMIC ANALYSER" proposed by the Rheometrics Company has been used. The thermo mechanical analysis measures precisely the visco-elastics changes of a sample as function of the temperature, the strain or the deformation applied. Strain is 0.1%. The temperature range is between -125°C and 150°C and the temperature is changed at 2°C/min. The apparatus records continuously, the sample deformation, keeping the strain fixed, during a controlled program of temperature variation. The results are obtained by drawing, in function of the temperature, the elastic modulus (G' ) , the loss modulus and the tan delta. The Tg is highest temperature value read in the tan delta curve, when the derived of tan delta is equal to zero.

[0194] Molecular Weight

The mass average molecular weight (Mw) of the polymers is measured with by size exclusion chromatography (SEC) . Polystyrene standards are used for calibration. The polymer is dissolved in THF at a concentration of lg/L. The chromatography column uses modified silica. The flow is lml/min and a detector of refractive index is used .

[0195] Particle size analysis

The particle size of the primary particles after the multistage polymerization is measured with a Zetasizer.

The particle size of the polymer powder after recovering is measured with Malvern Mastersizer 3000 from MALVERN.

For the estimation of weight average powder particle size, particle size distribution and ratio of fine particles a Malvern Mastersizer 3000 apparatus with a 300mm lenses, measuring a range from 0,5-880pm is used.

[0196] Porosity

[0197] The porosity of a polymer powder POW1 is expressed as total intruded volume or total ccumulative intrusion (cumulative intruded volume) in millilitre (ml) of mercury per mass (g) of said polymer powder POW1. This is measured according to the norm ISO 15901-1: Evaluation of pore size distribution and porosity of solid materials by mercury porosity and gas adsorption - Part 1: mercury porosity.

[EXAMPLES]

[0198] Raw Materials :

[0199] As component (LC1) the commercial resins ATLAC430, ATLAC590 and ATLAC P600 from the company Aliancys are used.

[0200] The multistage polymer (MP1) is made according to the following synthesis : First stage (SA1) - polymerization of a polymer type (Al) : To a 20 litres high-pressure reactor was charged : de-ionized water 116.5 parts, emulsifier potassium salt of beef tallow fatty acid 0.1 part, 1,3-butadiene 21.9 parts, t- dodecyl mercaptan 0.1 parts, and p-menthane hydroperoxide 0.1 parts as an initial kettle charge. The solution was heated, with agitation, to 43°C at which time a redox-based catalyst solution was charged (water 4.5 parts, sodium tetrapyrophosphate 0.3 parts, ferrous sulphate 0.004 parts and dextrose 0.3 parts), effectively initiating the polymerization. Then the solution was further heated to 56°C and held at this temperature for a period of three hours. Three hours after polymerization initiation, a second monomer charge (77.8 parts BD, t-dodecyl mercaptan 0.2 parts), one-half of an additional emulsifier and reductant charge (de ionized water 30.4 parts, emulsifier potassium salt of beef tallow fatty acid 2.8 parts, dextrose 0.5 parts) and additional initiator (p-menthane hydroperoxide 0.8 parts) were continuously added over eight hours. Following the completion of the second monomer addition, the remaining emulsifier and reductant charge plus initiator was continuously added over an additional five hours. Thirteen hours after polymerization initiation, the solution was heated to 68 °C and allowed to react until at least twenty hours had elapsed since polymerization initiation, producing polybutadiene rubber latex, R1. The resultant polybutadiene rubber latex (Al) contained 38% solids and had a weight average particle size of about 160 nm.

[0201] Second stage (SA2) - Polymerization of polymer type (A2) : into a 3.9 litres reactor was charged 75.0 parts, on a solids basis, of polybutadiene rubber latex Rl, 37.6 parts de-ionized water, and 0.1 parts sodium formaldehyde sulfoxylate. The solution was agitated, purged with nitrogen, and heated to 77°C. When the solution reached 77 °C, a mixture of 22.6 parts methyl methacrylate, 1.4 parts divinyl benzene and 0.1 parts t-butyl hydroperoxide initiator was continuously added over 70 minutes, followed by o hold period of 80 minutes. Thirty minutes after the onset of the hold period, 0.1 parts of sodium formaldehyde sulfoxylate and 0.1 parts t-butyl hydroperoxide were added to the reactor at once. Following the 80-minute hold period, a stabilization emulsion was added to the graft copolymer latex. The stabilization emulsion was prepared by mixing 3.2 parts de-ionized water (based on graft copolymer mass), 0.1 parts oleic acid, 0.1 parts potassium hydroxyde, and 0.9 parts octadecyl-3- ( 3 , 5-di- tertbutyl-4-hydroxyphenyl ) propionate . The resultant core shell polymer (A1+A2) had a weight average particle size of about 180 nm. The final multistage polymer (MP1) was then recovered, the polymer composition being coagulated and dried giving a powder of core/shell-1.

[ 0202 ] According to a preferred embodiment the thermoplastic polymer (Bl) having a glass transition temperature of at least 30°C is made as an additional stage on the multistage polymer (MP1) - Polymerization of polymer composition type Cl

Synthesis of the polymer (Bl) : semi continuous process: charged into a reactor, with stirring, were 10 OOOg of core shell polymer (A1+A2) still in dispersion in de-ionized water, O.Olg of FeS04 and 0.032g of ethylenediaminetetraacetic acid, sodium salt (dissolved in lOg of de-ionized water), 3.15g of sodium formaldehydesulfoxylate dissolved if llOg of de-ionized water and 21.33 g of emulsifier potassium salt of beef tallow fatty acid (dissolved in 139.44g of water), and the mixture was stirred until complete dissolution of added raw materials exept core-shell polymer. Three vacuum-nitrogen purges were carried out in succession and the reactor left under a slight vacuum. The reactor was then heated. At the same time, a mixture comprising 1066.7 g of methyl methacrylate and 10.67 g of n-octyl mercaptan was nitrogen-degassed for 30 minutes. The reactor is heated at 63°C and maintained at that temperature. Next, the monomers mixture was introduced into the reactor in 180min using a pump. In parallel, a solution of 5.33g of ter-butyl hydroperoxide (dissolved in lOOg of de-ionized water) is introduced (same addition time). The lines was rinsed with 50g and 20g of water. Then the reaction mixture was heated at a temperature of 80 °C and the polymerization was then left to completion for 60 minutes after the end of the monomers addition. The reactor was cooled down to 30°C. The mass average molecular weight of the copolymer Bl is M _w = 28 OOOg/mol.

[ 0203 ] The final polymer composition consisting of the multistage polymer (MP1) and polymer (Bl) was then recovered, the polymer composition being coagulated and dried giving a power of core/shell-2.

[0204] Mixing of components: lOOg of component (LC1) are put in a recipient made of aluminium. Varying quantities of multistage polymer (MP1) either already comprising the thermoplastic polymer (Bl) or not, in form of powder are added. It is agitated for 60min with a speed of 150-200rpm.

[0205] Rheology: the viscosity of the compositions is measured with a Anton Parr Rheometer. A cone-plate geometry is used (module CP- 50) at 25 ° C .

[0206] Dispersion test: 5wt% of the component MP1 or MP1 + Bl in powder form are added into 95% of the component LC1. In standard conditions the mixing is applied using a dispersion blade at 100- 200 RPM. After 60 minutes the aspect of the dispersion is evaluated as a function of the presence of undispersed powder particle (small grains), agglomeration of powder particle, single phase or biphasic dispersion and the presence of bubbles. In the case of bad dispersion, extra mixing for 60 minutes was applied at 500 RPM. Same procedure is made with quantity of component MP1 or MP1 + Bl.

[0207] Sample preparation to produce parts for mechanical test: standard BPO/Amine system (Benzoyl peroxide / Dimethylaniline ) curing agent were used. Dosage were selected in order to get a gel time around 30 min at room temperature.

[0208] Mechanical evaluation: tensile properties like elongation at break, tensile strength, and young modulus were evaluated using a ZWICK Z050 TH AllroundLine equipped with a 50kN cell following ISO 527 specification

[0209] Lap shear evaluation: were evaluated using a ZWICK Z050 TH AllroundLine equipped with a 50kN cell following EN 1465 specification. Aluminium plates were used as substrate. [ 0210 ] Composition Examples: a composition is made of following compounds :

[ 0211 ] Table 1: composition and dispersion results in ATLAC resins

[ 0212 ] The composition based on the invention (comprising compound b) the thermoplastic polymer (Bl)) can be easily and fast prepared for different compound c) . The obtained dispersions are inventive homogeneous . [ 0213 ] Table 2: mechanical properties results in polymerized ATLAC 430

[ 0214 ] In table 2 a significant increase in toughening is observed for a polymer obtained from a composition according to the invention. The fracture toughness increase significantly, as the crack growth resistance K _ic and the fracture toughness G _ic show.