Thermoformable blends of multiblock polymer compositions with po

Details Thermoformable blends of multiblock polymer compositions with po Thermoformable blends of multiblock polymer compositions with po

1991-01-28

1992-02-18

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...

525 99, C08L 2506, C08L 5302

Patent

active

050895583

ABSTRACT:
A polymer composition for use in making thermoformed products which comprises a blend of: (1) 20 to 75% by weight of a polyvinylaromatic resin, (2) 20 to 75% by weight of S.sub.1 -(B/S.sub.2).sub.n type block copolymer wherein S.sub.1 and S.sub.2 are vinylaromatic block polymers, B is a diene block polymer, (B/S.sub.2) represents a tapered or non-tapered block copolymer and the S.sub.1 block is 5 to 20% by weight of the block copolymer, (S.sub.1 +S.sub.2) is 65 to 95% by weight of the block copolymer, and the total block styrene content of the block copolymer ranges between 35 and 80% by weight, and (3) 0.5 to 10% by weight a diene-vinylaromatic block copolymer (B'-S') containing 10-60% by weight of the vinylaromatic polymer block.

REFERENCES:
patent: 4847326 (1989-07-01), Vituske

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