| 摘要 |
PROBLEM TO BE SOLVED: To provide film having solubility to cold water, specifically, having film strength enough to be used as a packaging material, readily soluble to cold water and slight in film surface stickiness and mechanical strength drop due to moisture absorption. SOLUTION: The film is 1-10 mol% in the copolymerization ratio of anionic group-containing vinyl units and contains a polyvinyl alcohol with a saponification degree of 80-89 mol% and a 4 mass% aqueous solution viscosity of 8-20 mP×s at 20°C. In the film, it is preferable that the anionic group be at least one functional group selected from carboxylic acid ester group, carboxylic acid group and carboxylic acid metal salt group. COPYRIGHT: (C)2006,JPO&NCIPI |
