Water-soluble film and packaging

Patent metadata

Field	Value
Publication number	US-2023312846-A1
Application number	US-202118003782-A
Country	US
Kind code	A1
Filing date	Jun 14, 2021
Priority date	Jun 29, 2020
Publication date	Oct 5, 2023
Grant date	—

Abstract

[Problem to be solved] To provide a water-soluble film capable of achieving both cold water solubility and resistance to oxidative deterioration.
[Solution] A water-soluble film containing a polyvinyl alcohol resin, wherein the water-soluble film has a surface on at least one side in which an abundance ratio of carbonyl in all carbon bonds obtained by X-ray photoelectron spectroscopy is 1 to 5%, and a complete dissolution time in water at 10° C. is 120 seconds or less.

First claim

1 . A water-soluble film containing a polyvinyl alcohol resin,
wherein the water-soluble film has a surface on at least one side in which an abundance ratio of carbonyl in all carbon bonds obtained by X-ray photoelectron spectroscopy is in the range of 1 to 5%, and a complete dissolution time in water at 10° C. is 120 seconds or less.

2 . The water-soluble film as claimed in claim 1 , wherein on the surface where the abundance ratio of carbonyl in all the carbon bonds is within the above range, a ratio (C—C/C═O) of an abundance ratio of carbon-carbon single bond obtained by the X-ray photoelectron spectroscopy to the abundance ratio of carbonyl is 10 to 50.

3 . The water-soluble film as claimed in claim 1 , wherein on the surface where the abundance ratio of carbonyl in all the carbon bonds is within the above range, an abundance ratio of carbon in all elements obtained by the X-ray photoelectron spectroscopy is 50 to 70%, an abundance ratio of oxygen is 20 to 35%, and a ratio of carbon to oxygen (C/O) is 1.5 to 3.5.

4 . The water-soluble film as claimed in claim 1 , wherein the surface having the abundance ratio of carbonyl in all the carbon bonds within the above range is subjected to surface modification.

5 . The water-soluble film as claimed in claim 4 , wherein the surface modification is by any method of ultraviolet treatment, ozone treatment, corona treatment, and plasma treatment.

6 . A package in which the water-soluble film as claimed in claim 1 stores a chemical.

7 . The package as claimed in claim 6 , wherein the chemical is a pesticide or a detergent.

8 . The package as claimed in claim 6 , wherein the chemical is in a liquid form.

9 . The package as claimed in claim 6 , wherein the chemical is stored so that the surface having the abundance ratio of carbonyl in all the carbon bonds within the range of 1 to 5% is in contact with the chemical.

Assignees

• Kuraray Co

Inventors

• Okamoto Minoru
• Shimizu Sayaka
• Kazeto Osamu

Classifications

• C08L29/04

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

• C08J2300/14

  Water soluble or water swellable polymers, e.g. aqueous gels · CPC title

• Y10T428/1379

  Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit · CPC title

• Y10T428/1341

  Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit · CPC title

• C09D129/04

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