# US 2017/0283142 A1 · Packaging bag, and method using same for storing polyvinyl alcohol-based resin that contains modified group having active hydrogen

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- Number: US 2017/0283142 A1
- Document ID: US20170283142A1
- Status: Published application
- Kind: A1
- Application number: 15/512,654
- Filed: 2015-09-28
- Published: 2017-10-05
- Earliest claimed: 2014-09-30
- Assignees: The Nippon Synthetic Chemical Industry Co., Ltd.
- Applicants: The Nippon Synthetic Chemical Industry Co., Ltd.
- Inventors: Hirosato TAKAHASHI; Yukitoshi NISHIKAWA; Tomoyuki FUJII
- Web page: https://patentgrep.com/patent/US20170283142A1

## CPC

- B32B 1/00: Layered products having a non-planar shape
- B32B 15/08: of synthetic resin
- B32B 15/082: comprising vinyl resins; comprising acrylic resins
- B32B 15/085: comprising polyolefins
- B32B 15/088: comprising polyamides
- B32B 15/09: comprising polyesters
- B32B 15/20: comprising aluminium or copper {(B32B15/016 and B32B15/017 take precedence)}
- B32B 27/06: as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08)}
- B32B 27/08: of synthetic resin
- B32B 27/10: of paper or cardboard
- B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/34: comprising polyamides
- B32B 27/36: comprising polyesters
- B32B 29/002: {as the main or only constituent of a layer, which is next to another layer of the same or of a different material (next to a layer of a particular substance B32B9/06; next to a bituminous or tarry layer B32B11/06; next to a water-setting substance layer B32B13/08; next to a metal layer B32B15/12; next to a glass layer B32B17/065; next to a layer formed of natural mineral fibres or particles B32B19/046; next to a wood layer B32B21/06; next to a cellulosic plastic layer B32B23/06; next to a natural or synthetic rubber layer B32B25/06; next to a synthetic resin layer B32B27/10)}
- B65D 65/40: Applications of laminates for particular packaging purposes {(B65D1/0215, B65D1/28, B65D3/22, B65D5/0281, B65D5/563, B65D9/30, B65D29/02, B65D31/02, B65D75/26, B65D77/2024, B65D81/1275, B65D81/3811, B65D81/3823, B65D81/3834, B65D81/3846, B65D81/3858, B65D81/3874, B65D81/3886, B65D81/3897 take precedence; laminates per se or laminated packages characterised by the composition or)}
- B65D 65/42: Applications of coated or impregnated materials
- B65D 81/24: Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants (with thermal insulation B65D81/38)
- B32B 2307/31: Heat sealable
- B32B 2307/7246: Water vapor barrier
- B32B 2309/105: Thickness
- B32B 2439/00: Containers; Receptacles
- B32B 2439/46: Bags
- Y02W 30/80: Packaging reuse or recycling, e.g. of multilayer packaging (bio-packaging Y02W90/10)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT

## Abstract

A packaging bag for packaging a polyvinyl alcohol-based resin that contains a modified group having active hydrogen, the packaging bag including a film having a water vapor permeability of 10 g/m2/day or less. Accordingly, when a polyvinyl alcohol-based resin that contains a modified group having active hydrogen is packaged with the packaging bag, the storage stability of the polyvinyl alcohol-based resin that contains a modified group having active hydrogen can be improved, and hence an aqueous solution of the polyvinyl alcohol-based resin that contains a modified group having active hydrogen, the solution being reduced in insoluble matter content, can be obtained even after long-term storage thereof.

## Claims

### Claim 1

A packaging bag configured to package a polyvinyl alcohol-based resin that contains a modified group having active hydrogen, wherein the packaging bag comprises a film having a water vapor permeability of 10 g/m2/day or less.

### Claim 2 (depends on 1)

The packaging bag according to claim 1, wherein the packaging bag includes only a water vapor barrier layer having a water vapor permeability of 10 g/m2/day or less.

### Claim 3 (depends on 1)

The packaging bag according to claim 1, wherein the packaging bag includes a multilayer structure film formed of a substrate film layer, a water vapor barrier layer, and a protective film layer.

### Claim 4 (depends on 1)

The packaging bag according to claim 1, wherein the packaging bag has a thickness of from 10 μm to 450 μm.

### Claim 5 (depends on 1)

The packaging bag according to claim 1, wherein the polyvinyl alcohol-based resin that contains a modified group having active hydrogen has an average polymerization degree in conformity with JIS K 6726 of from 200 to 4,000.

### Claim 6 (depends on 1)

The packaging bag according to claim 1, wherein the polyvinyl alcohol-based resin that contains a modified group having active hydrogen has a saponification degree in conformity with JIS K 6726 of from 80 mol % to 100 mol %.

### Claim 7 (depends on 1)

The packaging bag according to claim 1, wherein the polyvinyl alcohol-based resin that contains a modified group having active hydrogen comprises a powdery matter having an average particle diameter of from 100 μm to 1,000 μm.

### Claim 8 (depends on 1)

The packaging bag according to claim 1, wherein the polyvinyl alcohol-based resin that contains a modified group having active hydrogen comprises an acetoacetyl group-containing polyvinyl alcohol-based resin.

### Claim 9 (depends on 1)

The packaging bag according to claim 1, wherein an outer periphery of the packaging bag is sheathed with kraft paper.

### Claim 10

A method of storing a polyvinyl alcohol-based resin that contains a modified group having active hydrogen, wherein the method comprises hermetically sealing and packaging a particulate matter of the polyvinyl alcohol-based resin that contains a modified group having active hydrogen with a packaging bag including a film having a water vapor permeability of 10 g/m2/day or less.

### Claim 11 (depends on 10)

The method of storing a polyvinyl alcohol-based resin that contains a modified group having active hydrogen according to claim 10, wherein the polyvinyl alcohol-based resin that contains a modified group having active hydrogen comprises an acetoacetyl group-containing polyvinyl alcohol-based resin.