| http://www.w3.org/ns/prov#value | - The polymeric resin used to form the coating on the surface of the plastic material serves as a solvent for the photochromic compound and may be a material such as poly(vinyl chloride), poly(vinyl acetate), polyurethane, poly(vinyl butyral), copolymers of vinyl chloride and vinyl acetate, copolymers of vinyl chloride and vinylidene chloride, poly(vinyl propionate), cellulose acetate butyrate and p
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