Star block copolymer of vinylaromatic monomer and of conjugated

Details Star block copolymer of vinylaromatic monomer and of conjugated Star block copolymer of vinylaromatic monomer and of conjugated

1996-03-04

1997-06-03

Zemel, Irina S.

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

Synthetic resins

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

525314, C08F29704

Patent

active

056355610

ABSTRACT:
The invention relates to a star block copolymer of the formula [S.sub.1 -S.sub.2 -(B.sub.1 /S.sub.3)-B.sub.2 ].sub.m -X-[B.sub.2 (B.sub.1 /S.sub.3)-S.sub.2 ].sub.n in which X represents a polyfunctional radical resulting from a coupling agent, m and n represent non-zero integers such that m+n is equal to 3 or 4, S.sub.1 and S.sub.2 each represent a block of a polymer containing at least one vinylaromatic monomer, B.sub.2 represents a block of a polymer containing at least one conjugated diene, (B.sub.1 /S.sub.3) represents a block of a statistical copolymer containing at least one vinylaromatic monomer and at least one conjugated diene, 40 to 75% by weight of (B.sub.1 /S.sub.3) consisting of resulting from vinylaromatic monomer, characterized in that the sum of the mass of the blocks B.sub.2 contains more than 40% by weight and less than 90% by weight of the total mass of the conjugated diene contained in the said star block copolymer. The invention also relates to the process for obtaining this copolymer. The compositions comprising this copolymer and crystal polystyrene have noteworthy mechanical properties and transparencies.

REFERENCES:
patent: 4704434 (1987-11-01), Kitchen
patent: 4925899 (1990-05-01), Rendina
patent: 5130377 (1992-07-01), Trepka
patent: 5256736 (1993-10-01), Trepka
patent: 5290875 (1994-03-01), Moczygenba
patent: 5319033 (1994-06-01), Trepka
patent: 5399628 (1995-03-01), Moczygemba

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