GAS BARRIER MATERIAL

• US 20100316863A1
• Filed: 08/07/2008
• Published: 12/16/2010
• Est. Priority Date: 08/07/2007
• Status: Active Grant

• Current Assignee: KAO Corporation
• Original Assignee: KAO Corporation
• Inventors: Honbo, Naoki, Isogai, Akira, Maezawa, Takahiro, Mukai, Kenta, Kumamoto, Yoshiaki, Ugajin, Toru
• Granted Patent: US 8,029,896 B2
• Time in Patent Office: Days
• US Class Current: 428/292.1
• CPC Class Codes: C08B 15/02 Oxycellulose; Hydrocellulose; Cellulosehydrate, e.g. microcrystalline cellulose
• CPC Class Codes: C08J 7/0427 with only one layer of a composition containing a polymer binder with more layers C08J7/042
• CPC Class Codes: C08J 7/043 Improving the adhesiveness of the coatings per se, e.g. forming primers adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50
• CPC Class Codes: C08J 7/048 Forming gas barrier coatings
• CPC Class Codes: Y10T 428/249924 Noninterengaged fiber-containing paper-free web or sheet which is not of specified porosity
• CPC Class Codes: Y10T 428/2965 Cellulosic
• CPC Class Codes: Y10T 428/298 Physical dimension

Abstract

Provided is a material for gas barrier containing cellulose fibers having an average fiber diameter of not more than 200 nm, wherein the content of the carboxyl group in a cellulose composing the cellulose fiber is 0.1 to 2 mmol/g. A molded composite having gas barrier properties such as high oxygen barrier properties can be produced by applying the material for gas barrier on a substrate and drying.

Claims

1. A material for gas barrier, comprising cellulose fibers having an average fiber diameter of not more than 200 nm, wherein the content of carboxyl group in a cellulose composing the cellulose fiber ranges from 0.1 to 2 mmol/g.

2. The material for gas barrier according to claim 1, wherein the cellulose fibers have an average aspect ratio from 10 to 1,000.

3. The material for gas barrier according to claim 1 or 2, wherein a suspension of the cellulose fibers diluted to 0.1% by mass of a solid content contains cellulose fibers passing through a 16 μ

m-mesh glass filter in an amount of not less than 5% by mass of the whole cellulose fibers in the suspension before passing.

4. The material for gas barrier according to claim 1 or 2, wherein a suspension of the cellulose fibers diluted to 1% by mass of a solid content does not contain a cellulose particle having a particle diameter of not less than 1 μ

m.

5. The material for gas barrier according to claim 1 or 2, wherein a suspension of the cellulose fibers diluted to 1% by mass of a solid content has a light transmittance of not less than 0.5%.

6. A molded article having gas barrier properties, comprising the material for gas barrier according to any one of claims 1 to 5.

7. A molded composite having gas barrier properties, comprising a molded substrate and a layer comprising the material for gas barrier according to any one of claims 1 to 5.

8. The molded composite having gas barrier properties according to claim 7, wherein the substrate or a moisture preventive layer has a vapor permeability from 0.1 to 600 g/m²·

day.

9. The molded composite having gas barrier properties according to claim 7 or 8, wherein the substrate or the moisture preventive layer is composed of a biodegradable material or a biomass-derived material.

10. The molded composite having gas barrier properties according to any one of claims 7 to 9, wherein the layer composed of the material for gas barrier has a thickness of not more than 900 nm.

11. The molded composite having gas barrier properties according to any one of claims 7 to 10, wherein the layer composed of the material for gas barrier is formed by coating or spraying the material for gas barrier.