ABC block copolymers based on butadiene, isoprene and styrene, p

Details ABC block copolymers based on butadiene, isoprene and styrene, p ABC block copolymers based on butadiene, isoprene and styrene, p

1990-10-01

1992-03-17

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...

525271, 525931, 525258, 525259, 525 95, 524571, 524577, C08F29704, C08L 900, C08J 324

Patent

active

050969730

ABSTRACT:
An unsaturated, elastomeric ABC block copolymer comprised of the monomer units of 40 to 80% of 1,3-butadiene, 5 to 40% of isoprene and 2 to 30% of styrene, said copolymer comprising i) 40 to 75% of block A which contains styrene and butadiene units or isoprene and butadiene units with a content of distributed vinyl or isopropenyl groups of less than 15%, iia) up to 25% of a block B which contains styrene and butadiene units or isoprene and butadiene units with a vinyl or isopropenyl content of more than 70%, or iib) up to 25% of a block B' which contains styrene, isoprene and optionally butadiene units with a content of homogeneously distributed isopropenyl or vinyl groups of less than 15%, and iii) 20 to 55% of a block C which contains styrene and isoprene units and optionally butadiene units with an isopropenyl or vinyl content of more than 70%.

REFERENCES:
patent: 4814386 (1989-03-01), Hellermann et al.

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