# US 11,999,832 B2 · Polyvinyl alcohol-based resin film

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- Number: US 11,999,832 B2
- Document ID: US11999832B2
- Status: Granted
- Kind: B2
- Application number: 17/423,845
- Filed: 2019-10-10
- Published: 2022-03-17
- Granted: 2024-06-04
- Earliest claimed: 2019-01-30
- Assignees: Aicello Corporation
- Applicants: Aicello Corporation
- Inventors: Mizuki Shigemasa; Yohei Kuchina; Hirokazu Ohsawa
- Web page: https://patentgrep.com/patent/US11999832B2

## CPC

- B29C 41/26: by depositing flowable material on a rotating drum
- C08J 5/18: Manufacture of films or sheets
- B29C 41/003: {characterised by the choice of material}
- B32B 27/08: of synthetic resin
- B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers}
- C08K 5/42: Sulfonic acids; Derivatives thereof
- C08L 29/04: Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
- G02B 1/10: Optical coatings produced by application to, or surface treatment of, optical elements (G02B1/08 takes precedence)
- B29K 2029/04: {PVOH, i.e. polyvinyl alcohol (B29K2031/04 takes precedence)}
- B29L 2031/712: {Containers; Packaging elements or accessories, Packages (closures therefor B29L2031/56; ink or toner cartridges B29L2031/7678; squeeze tubes B29L2023/20; suitcases B29L2031/7418)}
- C08J 2329/04: Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
- C08K 5/0016: {Plasticisers}
- C08K 5/053: Polyhydroxylic alcohols
- C08K 5/098: Metal salts of carboxylic acids
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES

## Abstract

An object is to smoothly obtain, through coating of the surface of a metal roll, a polyvinyl alcohol-based resin film that contains a polyvinyl alcohol-based resin and can be used in a water sealing process, and/or to lower the adhesion force of such film on metal seal bar, etc., during heat sealing. As a solution, a polyvinyl alcohol-based resin film containing components A to C below is provided: A. a polyvinyl alcohol-based resin; B. a plasticizer; and C. one or more types selected from sodium polyoxyethylene alkyl ether acetate, disodium polyoxyethylene alkyl sulfosuccinate salt, N-alkyl-N-methyl-ß-alanine sodium salt, and sodium alkane-1,2-diol acetate salt.

## Claims

### Claim 1

An anionic group-modified polyvinyl alcohol-based water-soluble resin film containing components A to C below:
A. an anionic group-modified polyvinyl alcohol-based resin;
B. one or more components selected from glycerin, sorbitol, polyethylene glycol, and diglycerin; and
C. one or more components selected from sodium polyoxyethylene alkyl ether acetate, disodium polyoxyethylene alkyl sulfosuccinate salt, N-alkyl-N-methyl-ß-alanine sodium salt, and sodium alkane-1,2-diol acetate salt.

### Claim 2 (depends on 1)

The anionic group-modified polyvinyl alcohol-based water-soluble resin film according to claim 1, wherein component C comprises one or more components selected from sodium polyoxyethylene lauryl ether acetate, sodium polyoxyethylene tridecyl ether acetate, disodium polyoxyethylene alkyl sulfosuccinate salt, N-lauroyl-N-methyl-ß-alanine sodium salt, and sodium dodecane-1,2-diol acetate salt.

### Claim 3 (depends on 1)

The anionic group-modified polyvinyl alcohol-based water-soluble resin film according to claim 1, wherein an alkali metal salt of fatty acid having 6 to 22 carbon atoms is contained as component D.

### Claim 4 (depends on 1)

The anionic group-modified polyvinyl alcohol-based water-soluble resin film according to claim 1, obtained by coating on a metal roll an aqueous solution of anionic group-modified polyvinyl alcohol-based resin free from phosphorus atom-containing surfactant, drying the solution, and then releasing the resulting film from the metal roll, wherein a release strength of the film at a time of release is 550 gf/200 mm or lower.

### Claim 5 (depends on 1)

The anionic group-modified polyvinyl alcohol-based water-soluble resin film according to claim 1, wherein, when two pieces of the anionic group-modified polyvinyl alcohol-based water-soluble resin film are heated and pressed by a seal bar to be sealed, an adhesion strength of the anionic group-modified polyvinyl alcohol-based water-soluble resin film per 70 mm of width, on the seal bar heated to 150° C., is 500 gf/70 mm or lower.

### Claim 6 (depends on 2)

The anionic group-modified polyvinyl alcohol-based water-soluble resin film according to claim 2, wherein an alkali metal salt of fatty acid having 6 to 22 carbon atoms is contained as component D.

### Claim 7 (depends on 2)

The anionic group-modified polyvinyl alcohol-based water-soluble resin film according to claim 2, obtained by coating on a metal roll an aqueous solution of anionic group-modified polyvinyl alcohol-based resin free from phosphorus atom-containing surfactant, drying the solution, and then releasing the resulting film from the metal roll, wherein a release strength of the film at a time of release is 550 gf/200 mm or lower.

### Claim 8 (depends on 2)

The anionic group-modified polyvinyl alcohol-based water-soluble resin film according to claim 2, wherein, when two pieces of the anionic group-modified polyvinyl alcohol-based water-soluble resin film are heated and pressed by a seal bar to be sealed, an adhesion strength of the anionic group-modified polyvinyl alcohol-based water-soluble resin film per 70 mm of width, on the seal bar heated to 150° C., is 500 gf/70 mm or lower.

### Claim 9 (depends on 3)

The anionic group-modified polyvinyl alcohol-based water-soluble resin film according to claim 3, obtained by coating on a metal roll an aqueous solution of anionic group-modified polyvinyl alcohol-based resin free from phosphorus atom-containing surfactant, drying the solution, and then releasing the resulting film from the metal roll, wherein a release strength of the film at a time of release is 550 gf/200 mm or lower.

### Claim 10 (depends on 3)

The anionic group-modified polyvinyl alcohol-based water-soluble resin film according to claim 3, wherein, when two pieces of the anionic group-modified polyvinyl alcohol-based water-soluble resin film are heated and pressed by a seal bar to be sealed, an adhesion strength of the anionic group-modified polyvinyl alcohol-based water-soluble resin film per 70 mm of width, on the seal bar heated to 150° C., is 500 gf/70 mm or lower.

### Claim 11 (depends on 4)

The anionic group-modified polyvinyl alcohol-based water-soluble resin film according to claim 4, wherein, when two pieces of the anionic group-modified polyvinyl alcohol-based water-soluble resin film are heated and pressed by a seal bar to be sealed, an adhesion strength of the anionic group-modified polyvinyl alcohol-based water-soluble resin film per 70 mm of width, on the seal bar heated to 150° C., is 500 gf/70 mm or lower.

### Claim 12 (depends on 6)

The anionic group-modified polyvinyl alcohol-based water-soluble resin film according to claim 6, obtained by coating on a metal roll an aqueous solution of anionic group-modified polyvinyl alcohol-based resin free from phosphorus atom-containing surfactant, drying the solution, and then releasing the resulting film from the metal roll, wherein a release strength of the film at a time of release is 550 gf/200 mm or lower.