Styrene-based resin composition

Details Styrene-based resin composition Styrene-based resin composition

1990-06-04

1992-12-29

Seidleck, James 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 88, 525 98, 525 99, 525241, C08L 5302, C08L 2504

Patent

active

051752131

ABSTRACT:
A styrene-based resin composition comprising (A) a styrene-based polymer and (B) a rubber-like polymer dispersed in the styrene-based polymer. The dispersed particles of the rubber-like polymer comprise a styrene-butadiene-based block copolymer comprising 5 to 95% by weight of a conventional diblock-type polymer and 95 to 5% by weight of a tapered block-type polymer, wherein the butadiene unit content of the styrene-butadiene-based block copolymer is 6 to 16% by weight, based on the weight of the composition. The particles have a weight ratio of gel content to rubber-like polymer of 1.1:1 to 4.0:1 and have a swelling index of 5 to 20. The particles have an area average diameter of 0.1 to 0.9 .mu.m, with a ratio of area particle diameter to number average particle diameter of 1.0 to 1.8. The styrene-based resin composition has a high Izod impact strength and a high drop-weight impact strength, and further has excellent gloss and stiffness properties.

REFERENCES:
patent: 3906057 (1975-09-01), Durst
patent: 3906058 (1975-09-01), Durst
patent: 4195136 (1980-03-01), Sato et al.
patent: 4267283 (1981-05-01), Whitehead
patent: 4839418 (1989-06-01), Schwaben et al.

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