| http://www.w3.org/ns/prov#value | - Layers of this type are described in U.S. Pat. No. 4,686,118 and materials useful for the formation of such layers include homopolymers or copolymers formed from vinyl acetate, acrylic acid esters, ethylene, vinyl chloride or other vinyl monomers, polyvinyl alcohols, polyurethane, cellulose derivatives, polyesters and polyamides.
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