f one or more alkenyl aromatic monomers with an ethylenically unsaturated nitrile, acrylonitrile-styrene-butadiene polymers, polymers of ??-olefins other than ethylene and propylene, polyesters such as polyethylene terephthalate, polybutylene terephthalate and the like, polyvinyl chloride, polycarbonates and well as other thermoplastic resins.