Method of making hydrophilic articles of water-insoluble polymers

Claim 1

A process for the production of a hydrophilic film of a water-insoluble polymer selected from the group consisting of regenerated cellulose, cellulose ether, cellulose ester, and polyalkylene, and capable of forming films, which comprises sprinkling the surface of said film, in tackified condition, with from an amount effective to render said film hydrophilic up to 50% by weight of the total weight of said film, of amorphous particles of a size within the range of about 0.01 to 2 mm of an orginally water-soluble cellulose ether selected from the group consisting of carboxymethyl cellulose, hydroxyethyl cellulose and methylhydroxyethyl cellulose, prepared from natural cellulose and rendered by chemical cross-linking more than 50% by weight water-insoluble while remaining water-absorbent, said cross-linking agent being selected from the group consisting of dimethylol-methylene bisacrylamide, methylenebis-acrylamide, tri- and tetra-chloropyrimidine, cyanuric chloride, epichlorohydrin, dichloroacetic acid, a diepoxide and a di-α-halogenohydrin.