	US 12,286,514 B2
	Water-soluble film and package
Minoru Okamoto, Okayama (JP); Sayaka Shimizu, Okayama (JP); and Osamu Kazeto, Okayama (JP)
Assigned to KURARAY CO., LTD., Okayama (JP)
Filed by KURARAY CO., LTD., Okayama (JP)
Filed on Jun. 28, 2021, as Appl. No. 17/360,018.
Application 17/360,018 is a continuation of application No. PCT/JP2019/051490, filed on Dec. 27, 2019.
Claims priority of application No. 2018-248289 (JP), filed on Dec. 28, 2018.
Prior Publication US 2021/0324160 A1, Oct. 21, 2021
Int. Cl. C08J 5/18 (2006.01); B65D 65/46 (2006.01)

CPC C08J 5/18 (2013.01) [B65D 65/46 (2013.01); C08J 2329/04 (2013.01)]

20 Claims

1. A water-soluble film comprising a polyvinyl alcohol resin having: (i) a degree of saponification of 64 to 93 mol %, and (ii) a degree of polymerization of 200 to 8000, wherein,

a complete dissolution time of the water-soluble film is 90 seconds or less, and

when a crystallinity index calculated using a diamond prism is Fd1 and a crystallinity index calculated using a germanium prism is Fg1 for FT-IR measurement of a first surface of the water-soluble film by ATR technique,

the Fd1 and the Fg1 satisfy formulae below:

0.25≤Fd1≤0.65 (1)

Fd1/Fg1>1 (2).