. . "Those monomers can, for example, be nitrile containing monomers such as acrylonitrile, methacrylonitrile, ??-chloroacrylonitrile, ??-ethoxyacrylonitrile, fumaronitrile or crotonitrile; acrylic esters such as methyl acrylate or ethyl acrylate; methacrylic esters such as methyl methacrylate, isobornyl methacrylate or ethyl methacrylate; vinyl halides such as vinyl chloride; vinyl esters such as viny" . .