. polystyrene, and polymers of alkyl acrylates and methacrylates including copolymers incorporating acrylic or methacrylic acid; and polyesters; such as poly( ethylene glycol-co-isophthalic acid-coterephthalic acid), poly(p-cyclohexane dicarboxylic acid-co-isophthalic acid-cocyclohexylenebismethanol), poly(pcyclohexanedicarboxylic acid-co-2,2,4,4- tetramethylcyclobutane-l ,3-diol) and the like.