Patent ID: 9534071
Date: 2017-01-03
CPC Classifications: C08C,C08F,C08K,C08L

Claim:
1. A process for the preparation of a functionalized and branched elastomeric copolymer comprising the following steps: (a) anionic copolymerization of at least one conjugated diene monomer and at least one vinyl arene, in the presence of at least one hydrocarbon solvent, of at least one lithium-based initiator, and of at least one polar modifier, obtaining a solution comprising an elastomeric copolymer; (b) reacting at least 10% by weight of the polymeric chains present in the elastomeric copolymer in step (a) with at least one compound having at least one functional group selected from: epoxides, ketones, esters, aldehydes, obtaining a solution comprising a functionalized elastomeric copolymer; (c) adding a quantity of lithium-based initiator to the solution obtained in step (b), from 1 to 4 times the molar quantity of lithium-based initiator used in step (a) and a compound of bromine having general formula (I): wherein R represents a linear or branched C1-C30 alkyl group, a C3-C30 cycloalkyl group, a C6-C30 aryl group, wherein a functionalized and branched elastomeric copolymer is obtained in which the functionalization of the polymeric chains is of the terminal type.