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WO/1997/025369A1 |
A composite membrane is provided in which a porous substrate is impregnated with a polymeric composition comprising various combinations of 'alpha','beta','beta'-trifluorostyrene, substituted 'alpha','beta','beta'-trifluorostyrene and et...
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WO/1997/025477A1 |
A low surfactant content latex polymer suitable for use as a barrier layer is disclosed. The latex polymer comprises an aryl vinyl monomer, an aliphatic conjugated diene monomer, and an acrylamide-based monomer. The latex polymer has a m...
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WO/1997/023520A1 |
A process for the preparation of hydrocarbon solutions of monofunctional ether initiators of the following general structure: M-Qn-Z-O-[A(R1R2R3)] wherein M is an alkali metal selected from the goup consisting of lithium, sodium and pota...
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WO/1997/023488A1 |
An organic alumino-oxy compound having an A1 to A2 ratio of 0.1 or below in the 27Al-NMR spectrum of the compound wherein A1 is the area of the region enclosed by both the segment, which joins the minimum point found between two consecut...
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WO/1997/023522A1 |
The present invention relates to novel low molecular weight, structured polymer compositions. The invention also relates to methods for inhibiting scale formation, precipitation or deposition; increasing dispersion of insoluble precipita...
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WO/1997/023517A1 |
The invention relates to a process for the preparation of mechanically and osmostically stable high capacitive very acidic cation exchangers with a grain size of 0.1 mm by sulphonation of gel-like or porous pearl polymers with sulphuric ...
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WO/1997/021738A1 |
A polymerization catalyst comprising (a) a specific transition metal compound, (b) either a compound capable of reacting with the compound (a) to form an ionic complex or a specific oxygenic compound, and (c) an alkylating agent as an op...
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WO/1997/021741A1 |
The invention relates to a process for the preparation of copolymerisates of vinyl aromatic compounds at temperatures ranging from -80 �C to 150 �C in the presence of metallocene catalyst systems, polymerisation occurring using a tig...
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WO/1997/021742A1 |
The invention relates to a process for the preparation of polymerisates of vinyl aromatic compounds at temperatures ranging from -80 �C to 150 �C in the presence of metallocene catalyst systems, polymerisation occurring using a tight...
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WO/1997/018248A1 |
A process for producing copolymers from vinylaromatic and olefinic compounds involving polymerisation in dispersion in the presence of metallocene catalyst systems.
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WO/1997/018247A1 |
Improved processes have been developed for atom (or group) transfer radical polymerization (ATRP). In one improvement, the ATRP process involves polymerizing in the presence of a (partially) free radical-deactivating amount of the corres...
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WO/1997/016476A1 |
The invention concerns foams containing cycloolefin copolymers. The foams according to the invention contain at least one cycloolefin copolymer which, relative to the total weight of the cycloolefin copolymer, contains between 0.1 and 10...
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WO/1997/016465A1 |
This invention concerns novel, unsymmetrically protected, telechelically functionalized linear and star or multi-arm polymers, their optionally hydrogenated analogues, the polymers produced by selective removal of the protecting groups, ...
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WO/1997/013796A1 |
A process for preparing a poly(hydroxystyrene) which comprises the steps of (a) heating a carbinol under decomposition conditions in the presence of a solvent for a sufficient period of time to form hydroxystyrene, said solvent having a ...
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WO/1997/013752A1 |
The invention relates to compounds of formula (I), in which R is H, C1-C12alkyl, phenyl, (C1-C4alkyl)phenyl, phenyl-C1-C4alkyl, halogen, C2-C12alkynyl or C1-C12alkoxy, X is NR', NCOR' or O, and Y is R'' or R''-CO-, where R'' is C2-C6alke...
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WO/1997/008231A1 |
A process is disclosed for continuously producing expandable styrene polymers by polymerising styrene in the presence of expanding agents in three steps: (a) prepolymerising styrene in the mass; (b) dispersing the prepolymer in an aqueou...
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WO/1997/007141A1 |
In the present invention, catalyst systems with a high degree of polymerisation are described which contain at least one catalyst constituent of general formula (I): RnMXm, in which M1 is Ti, Zr or Hf, Ra is C5 (R1, R2, R3, R4, R5) or C6...
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WO/1997/005174A1 |
Hetero-telechelic polymers having the formula (I): FG-(Q)d-Z-J-[A(R1R2R3)]x wherein FG is a protected or non-protected functional group; Q is a saturated or unsaturated hydrocarbyl group derived by incorporation of a compound selected fr...
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WO/1997/005179A1 |
The present invention provides novel, multi-arm or star-shaped polymers having mixed protected functional and non-functional ends, their optionally hydrogenated analogues, and the polymers produced by removal of the protecting groups. Th...
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WO/1997/002299A1 |
Halogen-free antidrip agents for thermoplastic molding compounds contain polymers based on vinyl aromatic monomers with molecular weights (Mw) of at least 800 000 g/mol and a narrow molecular weight distribution.
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WO/1997/002298A1 |
Disclosed herein is a process for the polymerization of ethylene, norbornenes and styrenes, by contacting in solution a selected nickel compound and a selected compound which is or can be coordinated to the nickel with the olefin(s). The...
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WO/1997/001585A1 |
The invention concerns a process for the anionic polymerization or copolymerization of vinyl aromatic compounds such as styrene in solution with an initial monomer concentration of between 40 and 100 wt.% under non-isothermic conditions,...
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WO/1996/039379A1 |
Sulfonyl fluoride substituted 'alpha','beta','beta'-trifluorostyrene monomers are disclosed. The monomers are incorporated into polymeric compositions which are conveniently hydrolyzed to produce polymeric compositions which include ion-...
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WO/1996/037353A1 |
A process for producing a styrenic resin which comprises granulating a powdered syndiotactic styrenic polymer by the use of a vented extruder having one or more vents each having an internal pressure of 0 to 760 Torr at a molding tempera...
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WO/1996/035509A1 |
A process for the preparation of hydrocarbon solutions of monofunctional ether initiators of the following general structure: M-Qn-Z-OA(R1R2R3) wherein M is defined as an alkali metal, selected from the group consisting of lithium, sodiu...
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WO/1996/034894A1 |
A process for producing a syndiotactic styrenic polymer, characterized in that the polymer is formed through at least two polymerization stages and that hydrogen is introduced in at least one arbitrary stage of them. According to this pr...
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WO/1996/034896A1 |
The present invention is a process of hydrogenating high molecular weight aromatic polymers comprising hydrogenating the high molecular weight aromatic polymer in the presence of a silica supported metal hydrogenation catalyst, character...
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WO/1996/033223A1 |
A high yield of three-armed radial anionic polymers is produced by the process of coupling metal terminated anionic polymers with a trialkoxysilane having a silicon-hydrogen bond, preferably trimethoxysilane. The metal terminated anionic...
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WO/1996/033224A1 |
This invention relates to a method for preparing compositions comprising terminally unsaturated polymers of low molecular weight, referred to as oligomers or macromonomers. In particular, a first oligomer composition is obtained by free ...
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WO/1996/033147A1 |
The application relates to a process for the oligomerization of aromatic or alicyclic hydrocarbons by means of a complex made up of BF3 and a cocatalyst. The aromatic hydrocarbon may preferably be styrene, alpha-methyl styrene, or a mixt...
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WO/1996/031578A1 |
The present invention provides a new and improved flame-retardant additive comprising a brominated syndiotactic styrenic polymer and a method of making and using the same. The additive has a melting temperature in excess of about 325 �...
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WO/1996/030421A1 |
A new polymerization process (atom transfer radical polymerization, or ATRP) based on a redox reaction between a transition metal (e.g., Cu(I)/Cu(II)), provides "living" or controlled radical polymerization of styrene, (meth)acrylates, a...
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WO/1996/029353A1 |
A process for producing polymers of vinyl aromatic compounds at temperatures in the 0 to 150 �C range in the presence of metallocene complexes as catalysts, in which polymerisation takes place at a pressure of 5 to 300 bar in the prese...
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WO/1996/029354A1 |
The present invention provides a unique and novel way of producing vinyl phenols such as poly(4-hydroxystyrene) (PHS). In this new process, 4-hydroxyphenylmethylcarbinol (HPMC) is heated under suitable conditions of temperature and press...
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WO/1996/029355A1 |
The present invention provides a unique and novel way of producing polyhydroxystyrene which comprises the steps of (a) heating 4-hydroxyacetophenone under suitable hydrogenation conditions of temperature and pressure in the presence of a...
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WO/1996/028482A1 |
A liquid phase, powder bed polymerization process for preparing syndiotactic polymers of vinylaromatic monomers comprising: A) continuously introducing one or more vinylaromatic monomers and one or more catalyst systems to a horizontally...
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WO/1996/028481A1 |
A process for preparing syndiotactic polymers of vinylaromatic monomers comprising contacting one or more vinylaromatic monomers with a catalyst system comprising a pentamethylcyclopentadienyltitanium based metal complex capable of prepa...
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WO/1996/027623A2 |
Particulate polystyrene preparations capable of being filtered are obtained by anionic polymerisation of styrene in a non-aqueous dispersion. Polymerisation is carried out in an aliphatic hydrocarbon as dispersing agent and with a styren...
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WO/1996/027620A1 |
A process for the preparation of (co)polymers employing a peroxide composition comprising at least one organic peroxide wherein at least 20 % of the total active oxygen content of said organic peroxide is attributable to one or more cycl...
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WO/1996/026227A2 |
The invention concerns a process for producing polymers of vinyl aromatic compounds at temperatures in the 0-150 �C range in the presence of catalyst systems containing as active components: (A) compounds of general formula (I): XM(Z1)...
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WO/1996/026226A1 |
The invention concerns catalyst systems of general formula (I) XM(Z1)z1(Z2)z2(Z3)z3, in which the substituents and indices have the following meanings: X represents C1-C10 alkyl, 5-7-membered cycloalkyl, C1-C10 alkoxy, C6-C15 aryl or com...
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WO/1996/024620A1 |
A method for polymerising or copolymerising at least one radical-polymerisable monomer in the presence of a stable free radical from the nitroxide family. The stable free radical is 'beta'-substituted and provides excellent polydispersit...
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WO/1996/023841A1 |
Granular leuco vat-dye preparations containing, as essential components, leuco vat-dye, reducing agents and alkaline metal hydroxide, and the production of said preparations and their use in dyeing cellulose-containing textile materials.
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WO/1996/020226A1 |
A method is disclosed of producing polymers of vinyl aromatic compounds at temperatures in the 0-150 �C range in the presence of catalyst systems in which the active components are (A) at least two different metallocene complexes; and ...
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WO/1996/019506A1 |
The present invention provides a unique and novel way of producing vinyl phenols such as poly(4-hydroxystyrene) (PHS). In this new process, p-'alpha'-aminoethylphenol (AEP) is heated under suitable conditions of temperature and pressure ...
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WO/1996/018657A1 |
A process for the preparation of hydrocarbon solutions of monofunctional amine initiators of general structures (II): M-Qn-Z-N(A(R1R2R3))2 or (IV), wherein M is defined as an alkali metal, selected from the group consisting of lithium, s...
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WO/1996/018664A1 |
Disclosed is a process for producing polystyrene by anionic polymerisation in non-aqueous dispersion in an aliphatic hydrocarbon (as dispersing agent) and with a styrene butadiene block copolymer (as dispersing auxiliary agent).
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WO/1996/018663A1 |
The present invention is a free radical bulk polymerization process for the preparation of high molecular weight polymers from vinyl aromatic monomers, characterized in that the polymerization is conducted in the presence of a vinyl acid...
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WO/1996/016997A1 |
A highly syndiotactic polystyrene (SPS) which has a weight-average molecular weight of 1x104 to 2x106 and wherein the weight fraction of the extract obtained by dissolving SPS in 1,2,4-trichlorobenzene, cooling the solution to yield a ge...
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WO/1996/016993A1 |
A method of controlling the molecular weight of a styrenic polymer by the addition of an organometallic compound, such as triethylaluminum, in the production of a highly syndiotactic crystalline styrenic polymer by using a catalyst for p...
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