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Matches 551 - 600 out of 5,686

Document Document Title
WO/2002/008300A1
The invention relates to an improved method for producing di- or tri-functional lithium based initiator systems and the use thereof for the polymerisation of conjugated dienes, especially for the copolymerisation of conjugated dienes wit...  
WO/2002/008299A1
The present invention provides protected functionalized polymerization initiators having less than one molar equivalent chain extension agent introduced therein to provide hydrocarbon solubility.  
WO2000069928A3
A process for polymerizing 1,3-butadiene into a low molecular weight high-cis polybutadiene is described using a catalyst system comprising: (a) a neodymium-containing compound, (b) an aluminoxane or a trialkyl aluminum compound, (c) an ...  
WO/2002/004559A1
An aromatic vinyl resin composition comprising: (A) 5 to 40 wt.% graft copolymer which is obtained by polymerizing (a4) 60 to 15 parts by weight of a vinyl monomer in the presence of 40 to 85 parts by weight of rubber particles (the sum ...  
WO/2001/096425A2
A butadiene-type polymer suitable for use as a processing aid in a rubber composition is formed by polymerizing butadiene or other conjugated diene monomers in a solvent, such as hexane, to form a polymer of relatively low molecular weig...  
WO/2001/094354A1
The invention relates to solutions of lithium pyrrolidine in a mixture consisting of tetrahydrofuran (THF) and of hydrocarbons, whereby the lithium pyrrolidine concentration ranges from 2 to 30 wt. %, and the molar ratio Li pyrrolidine: ...  
WO/2001/092346A2
A catalyst composition for the polymerization of olefins is provided, comprising a cyclopentadienyl transition metal catalyst precursor and an activating co-catalyst.  
WO/2001/087991A1
A catalyst component which is particularly suitable for the preparation of polydienes showing enhanced catalytic activity and solubility in hydrocarbon media is obtained by reacting a Nd trihalide with Mg diallyl compounds of formula MgA...  
WO2001034669A8
A catalyst composition that is the combination or reaction product of ingredients including an iron-containing compound, a hydrogen phosphite, and an aluminoxane can be used in the polymerization of conjugated diene monomers.  
WO/2001/079470A2
A catalyst composition that is the combination of or the reaction product of ingredients including (a) a molybdenum-containing compound, (b) a hydrogen phosphite, and (c) a blend of two or more sterically distinct organoaluminum compound...  
WO/2001/070821A1
A continuous process for making a polymer including branched and linear components includes first polymerizing conjugated diene(s) in the presence of an organometallic initiator to a conversion of at least 90%. A coupling agent is added ...  
WO/2001/070835A1
The invention relates to a method for producing caoutchouc particles (K) by means of emulsion polymerisation in the presence of an emulsifier and a polymerisation initiator. Said particles contain A) 80 to 100 wt. % of one or more conjug...  
WO/2001/068716A2
The invention is related to a novel compound represented by NdHA4 wherein A is a carboxylate, and to a diene polymerization catalyst using the novel compound. NdHA4 has monomeric structure and does not contain water, bases and salts. NdH...  
WO/2001/064758A1
A polymerization initiator solution which comprises a dilithium polymerization initiator wherein the number of functional groups is 1.8 to 2.0 per molecule on the average and a solvent selected among aliphatic hydrocarbon compounds and a...  
WO/2001/049754A1
A catalyst composition that is the combination of or the reaction product of ingredients including an iron-containing compound, a hydrogen phosphite, and a mixture of two or more organoaluminum compounds. This catalyst composition is par...  
WO/2001/049763A1
Blends of syndiotactic 1,2-polybutadiene and rubbery elastomers are prepared by a process that comprises polymerizing 1,3-butadiene monomer into syndiotactic 1,2-polybutadiene within a rubber cement of at least one rubbery elastomer by u...  
WO/2001/049755A1
A catalyst composition that is the combination of or the reaction product of ingredients including an iron-containing compound, an organomagnesium compound, and a cyclic hydrogen phosphite. This catalyst composition is particularly usefu...  
WO/2001/049753A1
A process for preparing conjugated diene polymers by polymerizingconjugated diene monomers in the presence of a catalyst composition that is formed by combining an iron-containing compound, a hydrogen phosphite, and an organoaluminum com...  
WO/2001/046268A1
A process for producing a synthetic diene rubber which comprises: adding an electrolyte capable of coagulating rubber latex particles to a polymerization system during emulsion polymerization at the time when the conversion into polymer ...  
WO/2001/042315A1
Group 4 metal complexes of the constrained geometry type, catalysts derived therefrom and polymerization processes using the same, characterized by a nitrogen containing aliphatic or cycloaliphatic moiety that is substituted with one or ...  
WO/2001/038408A2
The invention relates to a method for producing polymers on the basis of 1,3 dienes by radical polymerization of cyclodextrin-complexed 1,3 dienes and optionally further unsaturated monomers which can optionally also be cyclodextrin-comp...  
WO/2001/036494A1
The invention relates to a method for carrying out the anionic polymerization of vinyl aromatic monomers or dienes in the presence of a lithium organyl or lithium alcoholate and a magnesium compound or an aluminum compound, whereby a ste...  
WO/2001/036497A1
The invention is directed to organometallic catalysts prepared by a process comprising a) combining nucleophilic group-containing particulate support material with an arylboron or arylaluminum Lewis acid compound in the presence of a Lew...  
WO/2001/034659A1
A method for preparing a functionalized polymer comprising the steps of preparing a pseudo-living polymer by polymerizing conjugated diene monomer with a lanthanide-based catalyts, and reacting the pseudo-living polymer with at least one...  
WO/2001/034669A1
A catalyst composition that is the combination or reaction product of ingredients including an iron-containing compound, a hydrogen phosphite, and an aluminoxane can be used in the polymerization of conjugated diene monomers.  
WO/2001/034658A1
A method for preparing a functionalized polymer comprising the steps of preparing a pseudo-living polymer by polymerizing conjugated diene monomer with a lanthanide-based catalyst, and reacting the pseudo-living polymer with at least one...  
WO/2001/032724A1
A catalyst composition that is formed by combining (a)(i) an iron compound and a halogen-containing compound or (ii) a halogen-containing iron compound, (b) a hydrogen phosphite, and (c) an organoaluminum compound. This catalyst composit...  
WO/2001/030858A1
An olefin polymerization pre-catalyst and a method for preparing an activated olefin polymerization catalyst composition from the pre-catalyst are disclosed in formula (I): wherein M, R?1¿, R?2¿, R?3¿ and R?4¿ are defined herein.  
WO/2001/010917A1
Disclosed is a method for the production of a solution of high molecular polymers of conjugated dienes in a vinyl aromatic hydrocarbon by anionic polymerisation of said diene in the presence of an alkyl lithium catalyst. The invention al...  
WO/2001/004164A2
Organic compounds are hydrogenated in the presence of certain bis(pentadienyl) divalent Group IV metal complexes having $g(p)-bound, neutral, conjugated diene ligands. These complexes are effective hydrogenation catalysts for polymers co...  
WO/2001/002446A1
The invention concerns a catalytic system based on rare earth and magnesium and its use for polymerising unsaturated compounds. The inventive catalytic system is characterised in that it comprises a compound consisting of the reaction pr...  
WO/2000/075207A1
The invention concerns a method for preparing polymers, which consists in contacting: an ethylenically unsaturated monomer; a source of free radicals; and a compound (I) or general formula (IA), wherein R?2¿ represents a group, a cycle ...  
WO/2000/075201A1
A catalyst composition that is the combination of or the reaction product of ingredients including a molybdenum-containing compound, a hydrogen phosphite, and an organoaluminum compound. This catalyst composition is useful for polymerizi...  
WO/2000/073315A1
The invention relates to a catalyst system on the basis of fulven compounds that are reacted with a transition metal compound in the presence of a reducing agent. They are then reacted with an element H-acidic compound. The invention fur...  
WO/2000/073385A1
A chloroprene latex composition which has a chloroprene polymer gel content of 3 to 40 wt. % and in which the sol has a weight-average molecular weight of 400,000 or higher. The chloroprene latex is excellent in initial adhesion performa...  
WO/2000/071593A1
The invention relates to a method of polymerizing dienes in a solvent that contains vinyl-aromatic monomers. Said polymerization is carried out in the presence of an organometallic compound of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo or W as the ca...  
WO/2000/069928A2
A process for polymerizing 1,3-butadiene into a low molecular weight high-cis polybutadiene is described using a catalyst system comprising: (a) a neodymium-containing compound, (b) an aluminoxane or a trialkyl aluminum compound, (c) an ...  
WO/2000/069927A1
The present invention is related to a bimodal rubber characterized in that the bimodal rubber is a composition of linear, and branched rubber molecules, and has a broad, yet monomodal Mw distribution and rubber modified polymers produced...  
WO/2000/068283A1
A process for producing a synthetic rubber consisting mainly of butadiene units through emulsion polymerization, which comprises adding, in the course of polymerization, an electrolyte capable of coagulating rubber latex particles to the...  
WO/2000/068311A1
The invention relates to rubber mixtures containing diene rubbers which contain 0.1 - 2 wt. % primary hydroxyl groups and have a glass transition temperature of -120 to -50 °C. The invention also relates to mixtures comprising filling m...  
WO/2000/068284A1
Process for the preparation of sulphur-modified polychloroprene, in alkaline aqueous emulsion and in the presence of radical initiator, characterized in that one or more organic polysulphides are added to the reaction mixture, these orga...  
WO/2000/064948A1
The present invention relates to a method of anionically polymerizing monomers by contacting the monomers with a monofunctional anionic polymerization initiator which is an organo-substituted alkali metal compound other than a silicon-ba...  
WO/2000/063256A1
There is disclosed a method for preparing a silyl-functional living cationic polymer which can be subsequently coupled to form a moisture-curable telechelic system, said method comprising reacting, in the presence of a Lewis acid, (A) at...  
WO/2000/053643A1
A catalyst composition which is solid at room temperature comprises a transition metal or transition metal compound having on average more than one ligand co-ordinated thereto, each ligand being supported by a support via a divalent grou...  
WO/2000/050479A1
Novel protected amine anionic polymerization initiators useful in the preparation of polymers having a protected amine functional group. The initiators are very soluble in hydrocarbon solvents.  
WO/2000/050468A1
The invention relates to a polymerization initiator containing an alkaline-earth metal compound selected from the group: a) of the heteroleptic alkaline-earth metal compounds of formula (I) L - M - R or; b) of the cationic alkaline-earth...  
WO/2000/050478A1
Novel formulations of alkyllithium species having improved thermal stability are provided. The compositions include one or more alkyllithium compounds and one or more additives. Exemplary additives include silyl ethers, germane ethers, t...  
WO2000006610A3
A method for producing a polymeric material, said method comprising subjecting a starting material which includes two multiple bonds which are activated so that they will take part in a polymerisation reaction and wherein the multiple bo...  
WO2000006533B1
A compound of formula (I) where R<1> is CH and R<6> is a bond, or R<1> and R<6> together form an electron withdrawing group; R<2> and R<3> are independently selected from (CR<7>R<8>)n, or a group CR<9>R<10>, -(CR<7>R<8>CR<9>R<10>)- or -(...  
WO/2000/034348A1
Cationic polymerization initiators of formula (I) are disclosed. The acyl sulfonium salts of the present invention differ from known acyl sulfonium initiators in that the substituents R?2¿ and R?3¿ on the sulfur are larger and more com...  

Matches 551 - 600 out of 5,686