| 摘要 |
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.
|
