prov:value
| - ymeric acrylates and methacrylates, for example copolymers of methylmethacrylate, ethyl acrylate and methacrylic acid, poly(alkyl methacrylates), poly(alkyl acrylates), in which alkyl is C.sub.1 -C.sub.20, cellulose esters and cellulose ethers, such as cellulose acetate, cellulose acetate butyrate, methylcellulose,ethylcellulose, polyvinyl butyral, polyvinyl formal, cyclized rubber, polyethers, su
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