able compositions, a wide variety of polymers including vinyl polymers and copolymers such as polyvinyl alcohol, polyvinyl acetals, polyvinyl acetate vinyl sorbate, polyvinyl ester acetal, polyvinyl pyrrolidone, polyvinyl butyrol, halogenated polyvinyl alcohol; cellulose based polymers such as cellulose-acetate hydrogenphthalate, cellulose alkyl ethers; urea-formaldehyde resins; polyamide condensa