Water-soluble film and chemical agent package

• US 11,225,572 B2
• Filed: 06/25/2019
• Issued: 01/18/2022
• Est. Priority Date: 12/27/2016
• Status: Active Grant

• Current Assignee: Mitsubishi Chemical Corporation (Mitsubishi Chemical Group Corp.)
• Original Assignee: Mitsubishi Chemical Corporation (Mitsubishi Chemical Group Corp.)
• Inventors: Hiura, Takahiro
• Primary Examiner(s): Teskin, Fred M
• Application Number:
  US16/451,342
• Publication Number:
  US 20190322855A1
• Time in Patent Office: 938 Days
• Field of Search: 524388
• CPC Class Codes: B65D 65/46 Applications of disintegrable, dissolvable or edible materials
• CPC Class Codes: C08J 2300/14 Water soluble or water swellable polymers, e.g. aqueous gels
• CPC Class Codes: C08J 2329/04 Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
• CPC Class Codes: C08J 3/18 Plasticising macromolecular compounds plasticisers C08K
• CPC Class Codes: C08J 5/18 Manufacture of films or sheets
• CPC Class Codes: C08K 5/053 Polyhydroxylic alcohols
• CPC Class Codes: C08L 2203/16 used for films
• CPC Class Codes: C08L 29/04 Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
• CPC Class Codes: C11D 17/043 Liquid or thixotropic (gel) compositions

Abstract

A water-soluble film includes: a polyvinyl alcohol resin (A); and a plasticizer (B), wherein the plasticizer (B) contains a polyhydric alcohol (b1) having a melting point of more than 50° C. and 100° C. or less, a polyhydric alcohol (b2) having a melting point of 50° C. or less, and a polyhydric alcohol (b3) having a melting point of more than 100° C. The water-soluble film has a high tensile strength and a high tensile elongation, and does not cause bleed-out before the formation of a package.

Claims

1. A water-soluble film, comprising:

a polyvinyl alcohol resin (A);

a plasticizer (B), and

a filler (C),

wherein the plasticizer (B) contains

a polyhydric alcohol (b1) having a melting point of more than 50°

C. and 100°

C. or less,

a polyhydric alcohol (b2) having a melting point of 50°

C. or less, and

a polyhydric alcohol (b3) having a melting point of more than 100°

C.;

wherein a content of the filler (C) is from 1 part by weight to 30 parts by weight with respect to 100 parts by weight of the polyvinyl alcohol resin (A); and

wherein the water-soluble film has a water content of from 3 wt. % to 15 wt. %.

2. The water-soluble film according to claim 1, wherein the polyvinyl alcohol resin (A) comprises an anionic group-modified polyvinyl alcohol resin.

3. The water-soluble film according to claim 1, wherein the polyvinyl alcohol resin (A) comprises

an anionic group-modified polyvinyl alcohol resin and

an unmodified polyvinyl alcohol.

4. The water-soluble film according to claim 1, wherein a content of the plasticizer (B) is 25 parts by weight or more with respect to 100 parts by weight of the polyvinyl alcohol resin (A).

5. The water-soluble film according to claim 1, wherein a weight content ratio (b1/b3) of the polyhydric alcohol (b1) having a melting point of more than 50°

C. and 100°

C. or less to the polyhydric alcohol (b3) having a melting point of more than 100°

C. is from 1 to 40.

6. The water-soluble film according to claim 1, wherein the water-soluble film is capable of being used for chemical agent packaging.

7. The water soluble film according to claim 1, wherein the water-soluble film has a water content of from 5 wt. % to 15 wt. %.

8. The water soluble film according to claim 7, wherein the water-soluble film has a water content of from 6 wt. % to 13 wt. %.

9. The water-soluble film according to claim 1, wherein polyhydric alcohol (b1) is selected from the group consisting of trimethylolpropane, salicyl alcohol, threitol, xylitol, trehalose, and sorbitol.

10. The water-soluble film according to claim 1, wherein polyhydric alcohol (b2) is selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, tetraethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, tripropylene glycol, polyethylene glycol having a molecular weight of 2,000 or less, polypropylene glycol having a molecular weight of 2,000 or less, glycerin, diglycerin, and triethanolamine.

11. The water-soluble film according to claim 1, wherein polyhydric alcohol (b3) is selected from the group consisting of catechol, resorcinol, hydroquinone, bisphenol A, bisphenol F, neopentyl glycol, phloroglucinol, erythritol, pentaerythritol, arabitol, fucitol, glucose, fructose, mannitol, inositol, lactitol, sucrose, maltitol, and maltotriitol.

12. The water-soluble film according to claim 9, wherein polyhydric alcohol (b1) is selected from the group consisting of sorbitol and xylitol.

13. The water-soluble film according to claim 10, wherein polyhydric alcohol (b2) is selected from the group consisting of glycerin and propylene glycol.

14. The water-soluble film according to claim 11, wherein polyhydric alcohol (b3) is selected from the group consisting of mannitol and maltitol.

15. The water-soluble film according to claim 1, wherein polyhydric alcohol (b1) is selected from the group consisting of sorbitol and xylitol;

polyhydric alcohol (b2) is selected from the group consisting of glycerin and propylene glycol; and

polyhydric alcohol (b3) is selected from the group consisting of mannitol and maltitol.

16. The water-soluble film according to claim 1, wherein polyhydric alcohol (b1) comprises trimethylolpropane, sorbitol, xylitol, or combinations thereof;

polyhydric alcohol (b2) comprises 1,3-propanediol, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, tetraethylene glycol, tripropylene glycol, polyethylene glycol having a molecular weight of 2,000 or less, polypropylene glycol having a molecular weight of 2,000 or less, glycerin, diglycerin, or combinations thereof; and

polyhydric alcohol (b3) comprises neopentyl glycol, mannitol, maltitol, or combinations thereof.

17. A chemical agent package, comprising:

a package bag comprising a plurality of water-soluble films of claim 1 bonded to each other; and

a liquid chemical agent included in the package bag.

18. The chemical agent package according to claim 17, wherein the liquid chemical agent shows a pH value of from 6 to 12 when dissolved or dispersed in water, and the liquid chemical agent has a water content of 15 wt. % or less.

19. A water-soluble film, comprising:

a polyvinyl alcohol resin (A) comprising an anionic group-modified polyvinyl alcohol resin and an unmodified polyvinyl alcohol; and

a plasticizer (B), wherein the plasticizer (B) contains

a polyhydric alcohol (b1) having a melting point of more than 50°

C. and 100°

C. or less,

a polyhydric alcohol (b2) having a melting point of 50°

C. or less, and

a polyhydric alcohol (b3) having a melting point of more than 100°

C.