Among the thermoplastic resins which may be mentioned are homopolymers and copolymers of lower alkylacrylates, such as methyl acrylates, ethyl acrylates, methyl methacrylates, butyl methacrylates or copolymers of these or their equivalents with styrenes, including ring and chain substituted styrenes, acrylonitrile, polyvinyl chloride, and the like.