IP Library › Granted Patent US 12,371,540
Granted Patent B2
US 12,371,540 · App. 17/360,076 · Granted Jul 29, 2025

Water-soluble film and package

Inventors: Minoru Okamoto (Okayama, JP); Sayaka Shimizu (Okayama, JP); Osamu Kazeto (Okayama, JP)
Assignee: KURARAY CO., LTD.
C08J5/18B65D65/46C11D17/042C08J2329/04
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Quick Facts
Patent No.
US 12,371,540
App. No.
17/360,076
Granted
Jul 29, 2025
Kind
B2
Abstract

Provided are a water-soluble film capable of maintaining good mechanical strength even when packaging a liquid detergent and the like while maintaining excellent water solubility of the water-soluble film and a package using the same. A water-soluble film of the present invention includes a polyvinyl alcohol resin. When a crystallinity index calculated for a first surface is Fd1 and a crystallinity index calculated for a second surface opposed to the first surface is Fd2 for FT-IR measurement of respective two surfaces of the water-soluble film by ATR technique using a diamond prism, the Fd1 and the Fd2 are 0.22≤Fd1≤0.72, 0.2≤Fd2≤0.65 and Fd1/Fd2≥1.1.

Claims (39)

1. A water-soluble film comprising a polyvinyl alcohol resin, wherein the water-soluble film is soluble in water,

wherein a complete dissolution time of the water-soluble film in deionized water at 10° C. is 150 seconds or less, and

when a crystallinity index calculated for a first surface is Fd1 and a crystallinity index calculated for a second surface opposed to the first surface is Fd2 for FT-IR measurement of respective two surfaces of the water-soluble film by ATR technique using a diamond prism,

the Fd1 and the Fd2 satisfy formulae below:

0.22≤ Fd 1≤0.72, 0.2≤ Fd 2≤0.65  (1)

Fd 1/ Fd 2≥1.1  (2).

2. The water-soluble film according to claim 1 , wherein, when a crystallinity index calculated for the first surface is Fg1 and a crystallinity index calculated for the second surface is Fg2 for FT-IR measurement of the respective two surfaces by the ATR technique using a germanium prism,

the Fg1 and the Fg2 satisfy a formula below:

Fg 1/ Fg 2≥1.1  (3).

3. The water-soluble film according to claim 1 , wherein, when a crystallinity index calculated is Fg1 for FT-IR measurement of the first surface by the ATR technique using a germanium prism,

the Fd1 and the Fg1 satisfy a formula below:

Fg 1/ Fd 1≥1.05  (4).

4. A package comprising: a packaging material composed of the water-soluble film according to claim 1 and a chemical encapsulated in the packaging material.

5. The package according to claim 4 , wherein the packaging material is configured to cause the first surface of the water-soluble film to contact the chemical.

6. The package according to claim 4 , wherein the chemical is a pesticide, a detergent, or a germicide.

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

8. The water-soluble film according to claim 1 , wherein the polyvinyl alcohol resin has a degree of saponification of 64 to 93 mol %.

9. The water-soluble film according to claim 1 , wherein the polyvinyl alcohol resin has a viscosity-average degree of polymerization of 500 to 8,000.

10. The water-soluble film according to claim 1 , wherein the polyvinyl alcohol resin has a viscosity-average degree of polymerization of 200 to 300.

11. The water-soluble film according to claim 1 , wherein the polyvinyl alcohol resin includes (i) a polymer obtained from one or more vinyl ester-based monomers, (ii) a copolymer of one or more vinyl ester-based monomers and a copolymerizable monomer, or (iii) both (i) and (ii).

12. The water-soluble film according to claim 11 , wherein the polyvinyl alcohol resin includes the copolymer and the copolymerizable monomer includes maleic acid monomethyl ester.

13. The water-soluble film according to claim 11 , wherein the polyvinyl alcohol resin includes the copolymer and the copolymerizable monomer includes acrylamide-2-methylpropanesulfonic acid sodium salt.

14. The water-soluble film according to claim 11 , wherein the polyvinyl alcohol resin includes the copolymer, and a ratio of a number of structural unit derived from the copolymerizable monomer to a total number of structural units constituting the polyvinyl alcohol resin is 15 mol % or less.

15. The water-soluble film according to claim 11 , wherein the polyvinyl alcohol resin includes the polymer obtained from the one or more vinyl ester-based monomers.

16. The water-soluble film according to claim 1 , further comprising a plasticizer that includes glycerin.

17. The water-soluble film according to claim 16 , comprising the plasticizer at an amount of 1 part by mass or more to 40 parts by mass or less, based on 100 parts by mass of the polyvinyl alcohol resin.

18. The water-soluble film according to claim 1 , further comprising a surfactant at an amount of 10 parts by mass or less, based on 100 parts by mass of the polyvinyl alcohol resin, wherein the surfactant includes lauric acid diethanolamide.

19. A water-soluble film comprising a polyvinyl alcohol resin, wherein the water-soluble film is soluble in water,

wherein the polyvinyl alcohol resin has a viscosity-average degree of polymerization of 200 to 300, and

when a crystallinity index calculated for a first surface is Fd1 and a crystallinity index calculated for a second surface opposed to the first surface is Fd2 for FT-IR measurement of respective two surfaces of the water-soluble film by ATR technique using a diamond prism,

the Fd1 and the Fd2 satisfy formulae below:

0.22≤ Fd 1≤0.72, 0.2≤ Fd 2≤0.65  (1)

Fd 1/ Fd 2≥1.1  (2).

20. A water-soluble film comprising a polyvinyl alcohol resin, wherein the water-soluble film is soluble in water,

wherein the polyvinyl alcohol resin includes a copolymer of one or more vinyl ester-based monomers and a copolymerizable monomer, wherein the copolymerizable monomer includes maleic acid monomethyl ester or acrylamide-2-methylpropanesulfonic acid sodium salt, and

when a crystallinity index calculated for a first surface is Fd1 and a crystallinity index calculated for a second surface opposed to the first surface is Fd2 for FT-IR measurement of respective two surfaces of the water-soluble film by ATR technique using a diamond prism,

the Fd1 and the Fd2 satisfy formulae below:

0.22≤ Fd 1≤0.72, 0.2≤ Fd 2≤0.65  (1)

Fd 1/ Fd 2≥1.1  (2).

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 18, 2021
From: OKAMOTO, MINORU; SHIMIZU, SAYAKA; KAZETO, OSAMU
To: KURARAY CO., LTD.
Reel/Frame 057816/0926 →
Priority Claims (1)
JP 2018-248292 · Dec 28, 2018 · national
Continuity (2)
Continuation PCTJP2019051493 · Dec 27, 2019
Related Publication 20210324163A1 · Oct 21, 2021
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Cited By (1)
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