Patent ID: 7151140
Filing Date: 2006-12-19
Classification: C08C,C08G

Abstract:
1. A method for preparing an isoprene 1,3-butadiene copolymer, comprising: (a) mixing an isoprene to a 1,3-butadiene at a weight ratio of 7:3 to 9:1, but not including styrene, and performing a copolymerization reaction of the isoprene and the 1,3-butadiene in the presence of an organolithium initiator in a hydrocarbon solvent and a Lewis base to obtain a living polymer; (b) coupling the ends of the living polymer with a multi-reactive polysiloxane compound represented by the following formula 1; and (c) producing a reaction mixture containing a living polymer with uncoupled active ends and subsequently modifying the uncoupled active ends of the living polymer with an organic amine compound represented by the following formula 2, wherein the modification of the uncoupled active ends of the living polymer with an organic amine compound is performed: wherein X is a halogen atom; Y is Si or C; R is a lower alkyl group having less than 20 carbon atoms; R 1 is the same as R, or a hydrogen atom, a halogen-substituted alkyl group, or a halogen-substituted silane group; R 2 is the same as X or R 1 ; a is from 1 to 3; b is (3−a), wherein a+b=3; c is from 1 to 1000; and d is from 1 to 50000, wherein R