WATER-SOLUBLE COMPOSITE FILM

摘要

PURPOSE:To obtain a water-soluble composite film excellent in storage stability and transparency by integrally laminating a polyvinyl alcohol resin film to a film based on a water-soluble polymeric compd. constituted of a repeated unit represented by a specific general formula. CONSTITUTION:A water-soluble composite film used as a packing material for various articles or a sanitary article is formed by integrally laminating a PVA film to a film based on a water-soluble polymeric compd. constituted of a repeated unit represented by general formula [wherein A is a unit constituted of the repetition of (CH2CH2O) and depends on 7Owt.% or more of (CH2CH2 O) and the repetition number of (CH2CH2O) is an integer, X is a residue of an org. compd. having two active hydrogen atoms and R2 is a residue of a dicarboxylic acid compd. or a residue of a diisocyanate compd.]. Since this composite film can be produced by coating the PVA film with a raw material resin in a molten state, the production of the composite film is easy.