Water-soluble film and chemical agent package

Patent metadata

Field	Value
Publication number	US-11780976-B2
Application number	US-202016807578-A
Country	US
Kind code	B2
Filing date	Mar 3, 2020
Priority date	Oct 18, 2017
Publication date	Oct 10, 2023
Grant date	Oct 10, 2023

Abstract

To obtain a water-soluble film that is excellent in cold water solubility and is useful as a chemical agent package, provided is a water-soluble film, which is a polyvinyl alcohol water-soluble film including a carboxylic acid-modified polyvinyl alcohol resin (A) as a main component, wherein a lactonization rate of a carboxylic acid modifying group in the carboxylic acid-modified polyvinyl alcohol resin (A) is from 20% to 70%.

First claim

The invention claimed is:

1. A water-soluble film, which is a polyvinyl alcohol water-soluble film comprising a carboxylic acid-modified polyvinyl alcohol resin (A) as a main component,
wherein the carboxylic acid-modified polyvinyl alcohol resin (A) is an acrylic acid-modified polyvinyl alcohol resin; wherein a carboxylic acid modification amount of the carboxylic acid-modified polyvinyl alcohol resin (A) is greater than 4 mol % to 20 mol %; and
wherein a lactonization rate of a carboxylic acid modifying group in the carboxylic acid-modified polyvinyl alcohol resin (A) is from 20% to 70%.

2. The water-soluble film according to claim 1 , wherein the carboxylic acid modification amount of the carboxylic acid-modified polyvinyl alcohol resin (A) is greater than 4 mol % to 15 mol %.

3. The water-soluble film according to claim 1 , wherein the lactonization rate of the carboxylic acid modifying group in the carboxylic acid-modified polyvinyl alcohol resin (A) is from 20% to 65%.

4. The water-soluble film according to claim 1 , wherein the polyvinyl alcohol water-soluble film further comprises a plasticizer (B), and wherein a content of the plasticizer (B) is from 20 parts by weight to 70 parts by weight with respect to 100 parts by weight of the carboxylic acid-modified polyvinyl alcohol resin (A).

5. The water-soluble film according to claim 1 , wherein the water-soluble film is used as a chemical agent package.

6. The water-soluble film according to claim 1 , wherein the water-soluble film has a dissolution time of 250 seconds or less in a water solubility test in water at 10° C. after the water-soluble film is immersed in a liquid detergent having a pH of 8.

7. A chemical agent package, comprising:
a package bag comprising the water-soluble film of claim 1 ; and
a chemical agent packaged in the package bag.

8. The chemical agent package according to claim 7 , wherein the chemical agent comprises a detergent.

9. The chemical agent package according to claim 7 , wherein the chemical agent comprises a liquid detergent.

10. The chemical agent package according to claim 9 , wherein the liquid detergent has a pH of from 6 to 14.

11. The chemical agent package according to claim 9 , wherein the liquid detergent has a pH of from 6 to 8.

12. A water-soluble film, which is a polyvinyl alcohol water-soluble film comprising:
a carboxylic acid-modified polyvinyl alcohol resin (A) as a main component, and
a plasticizer (B);
wherein the carboxylic acid-modified polyvinyl alcohol resin (A) is an acrylic acid-modified polyvinyl alcohol resin, wherein a carboxylic acid modification amount of the carboxylic acid-modified polyvinyl alcohol resin (A) is greater than 4 mol % to 20 mol %,
wherein a lactonization rate of a carboxylic acid modifying group in the carboxylic acid-modified polyvinyl alcohol resin (A) is from 20% to 70%, and
wherein the plasticizer (B) comprises a polyhydric alcohol (B1) having a melting point of 80° C. or more and a polyhydric alcohol (B2) having a melting point of 50° C. or less.

13. The water-soluble film according to claim 12 , wherein the carboxylic acid modification amount of the carboxylic acid-modified polyvinyl alcohol resin (A) is greater than 4 mol % to 15 mol %.

14. The water-soluble film according to claim 12 , wherein the lactonization rate of the carboxylic acid modifying group in the carboxylic acid-modified polyvinyl alcohol resin (A) is from 20% to 65%.

15. A chemical agent package, comprising:
a package bag comprising a water-soluble film, and
a chemical agent packaged in the package bag;
wherein the water-soluble film is a polyvinyl alcohol water-soluble film comprising a carboxylic acid-modified polyvinyl alcohol resin (A) as a main component,
wherein the carboxylic acid-modified polyvinyl alcohol resin (A) is an acrylic acid-modified polyvinyl alcohol resin, wherein a carboxylic acid modification amount of the carboxylic acid-modified polyvinyl alcohol resin (A) is greater than 4 mol % to 20 mol %,
wherein a lactonization rate of a carboxylic acid modifying group in the carboxylic acid-modified polyvinyl alcohol resin (A) is from 20% to 70%, and
wherein the chemical agent is a liquid detergent having a pH of from 6 to less than 8.

16. The chemical agent package according to claim 15 , wherein the lactonization rate of the carboxylic acid modifying group in the carboxylic acid-modified polyvinyl alcohol resin (A) is from 20% to 65%.

Assignees

• Mitsubishi Chem Corp

Inventors

• HIURA Takahiro

Classifications

• C08F216/06

  Polyvinyl alcohol {; Vinyl alcohol} · CPC title

• C08K5/053

  Polyhydroxylic alcohols · CPC title

• C08J5/18 Primary

  Manufacture of films or sheets · CPC title

• C11D17/043

  Liquid or thixotropic (gel) compositions · CPC title

• C08J2329/04

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