Water-soluble film and packaging material

Patent metadata

Field	Value
Publication number	US-2024254294-A9
Application number	US-202117360040-A
Country	US
Kind code	A9
Filing date	Jun 28, 2021
Priority date	Dec 28, 2018
Publication date	Aug 1, 2024
Grant date	—

Abstract

A water-soluble film is provided that is capable of achieving deformation resistance during pouch storage as well as excellent water solubility of the film and excellent reduction in undissolved residues. A water-soluble film includes a polyvinyl alcohol-based resin, wherein a crystal long period Ds obtained from an X-ray profile obtained by small-angle X-ray scattering measurement in a water/methanol mixed solvent (volume ratio: 2/8) is from 10.0 to 30.0 nm and a rate of increase (DS−Da)/Da of the crystal long period Ds to a crystal long period Da obtained by small-angle X-ray scattering measurement before immersion in the solvent is 30% or more and 130% or less.

First claim

1 . A water-soluble film comprising a polyvinyl alcohol-based resin, wherein
a crystal long period Ds obtained from an X-ray profile obtained by small-angle X-ray scattering measurement in a water/methanol mixed solvent (volume ratio: 2/8) is from 10.0 to 30.0 nm and a rate of increase (DS−Da)/Da of the crystal long period Ds to a crystal long period Da obtained by small-angle X-ray scattering measurement before immersion in the solvent is 30% or more and 130% or less.

2 . The water-soluble film according to claim 1 , wherein the crystal long period Da of the water-soluble film obtained by small-angle X-ray scattering measurement before immersion in the solvent is from 9.0 to 15.0 nm.

3 . A package comprising: the water-soluble polyvinyl alcohol film according to claim 1 or 2 and a chemical contained using the water-soluble polyvinyl alcohol film.

4 . The package according to any one of claims 1 through 3 , wherein the chemical is a pesticide, a detergent, or a germicide.

5 . The package according to claim 3 or 4 , wherein the chemical is in a liquid form.

Assignees

• Kuraray Co

Inventors

• Okamoto Minoru
• Shimizu Sayaka
• Kazeto Osamu
• Asada Mitsunori

Classifications

• C08J2329/04

  Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids · CPC title

• B29K2995/0062

  water-soluble · CPC title

• B29D7/01

  Films or sheets · CPC title

• C08J3/244

  Stepwise homogeneous crosslinking of one polymer with one crosslinking system, e.g. partial curing · CPC title

• C08J2300/20

  Polymers characterized by their physical structure · CPC title