Water-soluble film, production method thereof, and chemical agent package
AssigneeMitsubishi Chemical Corporation
InventorsKouichirou Nakahara, Toshiya Ichiki
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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.
Claims17
A water-soluble film, comprising a polyvinyl alcohol resin (A), and having a first surface, which has a crystallinity index Xa, and a second surface, which is opposite to the first surface and has a crystallinity index Xb,
- wherein:
- the film is water-soluble such that the film dissolves in water at a temperature of 20° C.;
- Xa>Xb;
- a difference Xa−Xb is from 0.030 to 0.10;
- and
- the crystallinity indexes Xa and Xb are each measured through an infrared spectroscopic analysis by an attenuated total reflection method and represented by:
- ABS1141/ABS1093,
- wherein:
- ABS1141 is an absorbance at a wavenumber of 1141 cm−1;
- and
- ABS1093 is an absorbance at a wavenumber of 1093 cm−1.
Dependencies are inferred from the claim text.