Heat resistant styrenic polymer blends

Details Heat resistant styrenic polymer blends Heat resistant styrenic polymer blends

1991-04-22

1993-05-18

Nutter, Nathan M.

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

Synthetic resins

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

525 77, 525 78, C08L 900, C08L 5100

Patent

active

052122409

ABSTRACT:
Disclosed are styrenic polymer blends, preferably rubber modified styrenic polymer blends, containing a binary styrene/acrylonitrile copolymer in combination with a fumaronitrile-containing styrenic copolymer. The preferred rubber modified styrenic polymer blends hereof have improved heat and impact resistances and are composed of a binary styrene/acrylonitrile copolymer grafted to and/or occluded within a rubber substrate and dispersed in a matrix phase copolymer comprising fumaronitrile, styrene, and, optionally, acrylonitrile such that the concentration of acrylonitrile in the grafted and/or occluded portion of the rubber modifier is at least equal to and is preferably greater than the total concentration of fumaronitrile and acrylonitrile in the copolymer of the matrix phase.

REFERENCES:
patent: 2417607 (1947-03-01), Mowry
patent: 2439226 (1948-04-01), Seymour
patent: 2455342 (1948-11-01), Seymour
patent: 4267282 (1981-05-01), Tokas
patent: 4367310 (1983-01-01), Henton
patent: 4423188 (1983-12-01), Witschard
patent: 4427832 (1984-01-01), Yagi et al.
patent: 4536545 (1985-08-01), Olener et al.
patent: 4537933 (1985-08-01), Walker et al.

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