Transparent block copolymers having two monovinyl-substituted ar

Details Transparent block copolymers having two monovinyl-substituted ar Transparent block copolymers having two monovinyl-substituted ar

1987-12-03

1990-07-03

Briggs, Sr., Wilbert J.

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

Synthetic resins

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

525 96, 525 98, 525256, 525258, 525259, 525271, 525314, C08F29704, C08L 5302

Patent

active

049392085

ABSTRACT:
Transparent linear resinous conjugated diene/monovinyl-substituted aromatic block copolymers of improved properties are prepared by forming a monovinyl-substituted aromatic homopolymer block referred to as S.sub.1, followed by forming a conjugated diene homopolymer block, referred to as B.sub.1 and linked to segments S.sub.1, followed by the formation of a conjugated diene/monovinyl-substituted aromatic random copolymer block, referred to as B/S and linked to segment B.sub.1, followed by the formation of a monovinyl-substituted aromatic homopolymer block, referred to as S.sub.2 and linked to segment B/S thereby forming the block copolymer S.sub.1 -B.sub.1 -B/S-S.sub.2 wherein the molecular weight of the S.sub.2 block is significantly greater than the molecular weight of the S.sub.1 block.

REFERENCES:
patent: 3639517 (1987-12-01), Kitchen et al.
patent: 4086298 (1978-04-01), Fahrbach et al.
patent: 4089913 (1978-05-01), Miki et al.
patent: 4091053 (1978-05-01), Kitchen
patent: 4122134 (1978-10-01), Miki et al.
patent: 4167545 (1979-09-01), Fahrbach et al.
patent: 4168286 (1979-09-01), Moczygemba
patent: 4221884 (1980-09-01), Bi et al.
patent: 4704434 (1987-11-01), Kitchen et al.

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