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AssigneeBASF SE
InventorsStephan Jüngling, Hermann Gausepohl, Volker Warzelhan
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A process for preparing a solution of high molecular weight polymers of conjugated dienes in a vinylaromatic hydrocarbon by anionic polymerization of the diene in the presence of an alkyllithium as catalyst and a process for preparing impact-modified polymers of vinylaromatic compounds is described. The first process comprises firstly polymerizing the diene in solution in an aromatic hydrocarbon which is free of ethylenic double bonds to a molecular weight below about 105, then adding a trialkylaluminum in a molar excess relative to the alkyllithium, diluting the solution obtained with the vinylaromatic compound and then coupling the polydiene with a polyepoxide or an alkyl (meth)acrylate to give a high molecular weight polymer. The solution obtained in this way is further processed to give an impact-modified polymer of a vinylaromatic hydrocarbon by polymerizing the solution prepared as described, if desired after addition of further amounts of a vinylaromatic compound, in a manner known per se.
A process for preparing a solution of high molecular weight polymers of conjugated dienes in a vinylaromatic hydrocarbon by anionic polymerization of the diene in the presence of an alkyllithium as catalyst, wherein the diene is firstly polymerized in solution in an aromatic hydrocarbon which is free of ethylenic double bonds to a molecular weight Mw below about 105, a trialkylaluminum is then added in a molar excess relative to the alkyllithium, the solution obtained is diluted with the vinylaromatic compound and the polydiene is then coupled with a polyepoxide or an alkyl (meth)acrylate to give a high molecular weight polymer.
Dependencies are inferred from the claim text.