Linear block copolymers process for their preparation and adhesi

Details Linear block copolymers process for their preparation and adhesi Linear block copolymers process for their preparation and adhesi

1996-01-05

1996-09-10

Zemel, Irina

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

Synthetic resins

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

525316, 525 98, 524505, C08F29704

Patent

active

055546978

ABSTRACT:
Block copolymers of the structure A-B-C-D of improved processability derived from a vinyl aromatic monomer and a conjugated diene, having a total bound vinyl aromatic content in the range of from 10 to 40 wt %, wherein the conjugated diene has been polymerized in a 1,2 or 3,4 addition in an amount of from 1 to 20% of the total bound conjugated diene, and wherein A represents a predominantly poly(vinylaromatic)block, B represents a predominantly poly(conjugated diene), D represents a predominantly poly(vinylaromatic)block, and C represents a tapered block of the conjugated diene occurring in the block B and a the vinyl aromatic occuring in the block D, wherein the tapering in block C shows an increasing content of vinyl aromatic monomer in the direction to block D, wherein the weight ratio of the conjugated diene occurring in block B and the conjugated diene occurring in block C is in the range of from 5:5 to 9:1, and wherein the total apparent molecular weight of which is in the range of from 130,000 to 300,000.

REFERENCES:
patent: 4152370 (1979-05-01), Moczygemba
patent: 4939208 (1990-07-01), Lanza
patent: 5047484 (1991-09-01), Tung
patent: 5071920 (1991-12-01), Tung
patent: 5206300 (1993-04-01), Chamberlain
patent: 5234999 (1993-08-01), Tung
Block Copolymeric Applied Science Publishers London, 1972, pp. 82-83.

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