Preparation process for block copolymers for tire tread...

Details Preparation process for block copolymers for tire tread... Preparation process for block copolymers for tire tread...

2007-04-17

2007-04-17

Teskin, Fred (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S105000, C525S249000, C525S250000, C524S572000, C524S573000, C526S176000, C526S177000, C526S340200, C152S209100, C152S905000

Reexamination Certificate

active

10835409

ABSTRACT:
A preparation process for a copolymer having two blocks usable in a sulphur-cross-linkable rubber composition of reduced hysteresis in the cross-linked state, such a block copolymer in which one of the blocks is a polyisoprene and the other a diene elastomer other than a polyisoprene, and this rubber composition for tire treads. A process for the preparation of this copolymer involves copolymerizing one or more monomers including a conjugated diene other than isoprene using a catalytic system including at least one hydrocarbon solvent, a compound A of a metal of group IIIA, a compound B of an alkaline-earth metal and a polymeric initiator C having a C—Li bond which is constituted of a monolithiated polyisoprene intended to form the polyisoprene block, the number-average molecular weight Mn1of the polyisoprene block being between 2,500 and 20,000 g/mol. A copolymer is obtained in which the block composed of the diene elastomer has a number-average molecular weight Mn2of between 65,000 and 350,000 g/mol and a content of trans-1,4 linkages equal to or greater than 70%.

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Shimada et al. “Manufacture of conjugated diene polymers”, STN Chemical Abstract XP002113272; Copyright 1999 ACS.

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