Unsaturated, elastomeric, asymmetrically, coupled block copolyme

Details Unsaturated, elastomeric, asymmetrically, coupled block copolyme Unsaturated, elastomeric, asymmetrically, coupled block copolyme

1989-10-05

1991-10-29

Bleutge, John C.

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

Synthetic resins

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

525194, 525201, 525237, 525101, C08F 802

Patent

active

050617583

ABSTRACT:
An unsaturated elastomeric, asymmetrically coupled block copolymer of the formula: (A).sub.n -X-(B).sub.m, wherein block A is a block of polybutadiene having a content of uniformly distributed vinyl groups ranging from 8 to 60% and block (B) is a homopolymer of isoprene or a copolymer of at least 10% isoprene with 0 to 60% butadiene and up to 45% styrene, the copolymer having a vinyl unit content of 75 to 90%, X is a radical of a coupling agent and (m-n).gtoreq.0 and (m+n) ranges from 3 to 25.

REFERENCES:
patent: 4077893 (1978-03-01), Kioushy

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