AB block copolymers based on butadiene, isoprene and styrene

Details AB block copolymers based on butadiene, isoprene and styrene AB block copolymers based on butadiene, isoprene and styrene

1989-05-31

1991-10-01

Teskin, Fred

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

Synthetic resins

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

525 98, 525232, 525237, 525250, 525314, 5253328, 152209R, C08L 5302, C08F29704

Patent

active

050534599

ABSTRACT:
An unsaturated elastomeric AB block copolymer comprising 20-75 wt. % 1,3-butadiene monomer units; 5-50 wt. % isoprene monomer units; and 3-30% wt. % styrene monomer units; wherein said block copolymer contains less than 3 wt. % styrene blocks, each of said block A and block B contain all three of said monomer units, said copolymer comprises 30-90 wt. % of block A and 70-10 wt. % of block B, and wherein the average vinyl and isopropenyl content of block B are each at least 30% higher than those of block A; and a method for preparing the unsaturated AB block copolymer.

REFERENCES:
patent: 3780139 (1973-12-01), Sutter et al.
patent: 4673709 (1987-06-01), Nordsiek et al.
patent: 4814386 (1989-03-01), Hellermann et al.

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