| abstract |
(57) [Summary] [Structure] A polyvinyl alcohol-based polymer (A) and a functional group selected from a silicon-containing group capable of being converted into a silanol group in the presence of water at one end having a softening point of 0 ° C. or lower. A method for producing a water-soluble film, which comprises casting an aqueous solution of the water-soluble polymer (B) into a film. [Effect] The water-soluble film of the present invention has properties such as good appearance as a packaging material, film strength, chemical resistance, cold water solubility, and flexibility, and can be applied to a wide range of fields. For example, it is useful as a powder / granular / lump-shaped drug packaging material for laundry detergents, bleaching agents, agricultural chemicals, industrial chemicals, horticultural seed packaging materials, laundry bags, disposable daily necessities, and the like. |