WATER-SOLUBLE FILM AND CHEMICAL AGENT PACKAGE

• US 20190322855A1
• Filed: 06/25/2019
• Published: 10/24/2019
• 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
• Granted Patent: US 11,225,572 B2
• Time in Patent Office: Days
• 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); 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.

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 has a water content of from 3 wt. % to 15 wt. %.

7. The water-soluble film according to claim 1, wherein the water-soluble film is used for chemical agent packaging.

8. 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.

9. The chemical agent package according to claim 8, 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.