Patent ID: 11634547

Abstract:
A water-soluble film is provided, which is less susceptible to curling even after long-term storage. The water-soluble film includes a polyvinyl alcohol resin (A) , and has a first surface, which has a crystal Unity index Xa, and a second surface, which is opposite to the first surface and has a crystallinity index Xb, where: Xa≥Xb; Xa−Xb is from 0.015 to 0.10; and the crystallinity indexes Xa and Xb are measured through an infrared spectroscopic analysis by an attenuated total reflection method and represented by: ABS1141/ABS1093, wherein ABS1141 and ABS1093 are absorbances at wavenumbers of 1141 cm−1 and 1093 cm−1, respectively.