thanol and copolyesters thereof; polyamides such as nylon-6, nylon-6,6; polyolefins such as polyethylene, polypropylene, polystyrene, copolymers of ethylene and ??-olefins, especially linear ??-olefins, copolymers of ethylene with (meth)acrylate esters and/or methacrylic and/or acrylic acids and salts thereof, and copolymers of the above named olefins; acrylonitrile-butadiene-styrene copolymers; f