LAMINATED BODY, METHOD FOR PRODUCING THE SAME, AND MOLDED CONTAINER

• US 20130004687A1
• Filed: 03/18/2011
• Published: 01/03/2013
• Est. Priority Date: 03/24/2010
• Status: Active Grant

• Current Assignee: Toppan Printing Co., Ltd. (TOPPAN Holdings, Inc.)
• Original Assignee: Toppan Printing Co., Ltd. (TOPPAN Holdings, Inc.)
• Inventors: Oomori, Yumiko, Imai, Kazuko, Nishijima, Nao, Saiki, Akiko, Kimura, Mitsuharu
• Granted Patent: US 9,994,005 B2
• Time in Patent Office: Days
• US Class Current: 428/34.2
• CPC Class Codes: B32B 2255/12 on paper layer
• CPC Class Codes: B32B 2255/20 Inorganic coating
• CPC Class Codes: B32B 2255/205 Metallic coating
• CPC Class Codes: B32B 2255/28 Multiple coating on one surface
• CPC Class Codes: B32B 2307/54 Yield strength; Tensile strength
• CPC Class Codes: B32B 2307/7242 Non-permeable
• CPC Class Codes: B32B 2307/7244 Oxygen barrier
• CPC Class Codes: B32B 2439/00 Containers; Receptacles closures therefor B32B2435/00
• CPC Class Codes: B32B 2439/70 Food packaging
• CPC Class Codes: B32B 2439/80 Medical packaging
• CPC Class Codes: B32B 27/10 of paper or cardboard
• CPC Class Codes: B32B 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 29/06 specially treated, e.g. surfaced, parchmentised
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: D21H 15/02 characterised by configuration
• CPC Class Codes: D21H 17/25 Cellulose
• CPC Class Codes: D21H 19/34 comprising cellulose or derivatives thereof
• CPC Class Codes: D21H 19/52 Cellulose; Derivatives thereof
• CPC Class Codes: D21H 27/10 Packing paper packaging materials of special type or form B65D65/38
• CPC Class Codes: D21H 27/30 Multi-ply for surface covering D21H27/18; making on paper-making machines D21F9/00, D21F11/00
• CPC Class Codes: Y10T 428/1303 : Paper containing [e.g., paperboard, cardboard, fiberboard, etc.]
• CPC Class Codes: Y10T 428/249962 : Void-containing component has a continuous matrix of fibers only [e.g., porous paper, etc.]
• CPC Class Codes: Y10T 428/26 : Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension

Abstract

Disclosed is a material that effectively utilizes natural resources and is friendly to the environment as a whole. Specifically, disclosed is a barrier material that has excellent strength and excellent affinity and adhesion to a paper base due to an interaction with paper fibers and that gives sufficient barrier properties even in the form of a thin film. A laminated body (100) includes, on at least one surface of a base (1) made of paper, a fiber layer (2) containing fine cellulose fibers each having a fiber diameter of 1 nm or more and 10 μm or less. In particular, the fine cellulose fibers preferably have a fiber diameter of 1 nm or more and 30 nm or less.

Claims

1. A laminated body having a plurality of layers laminated thereon, the laminated body comprising:

a base made of paper, and a fiber layer laminated on at least one surface of the base and containing fine cellulose fibers each having a fiber diameter of 1 nm or more and 10 μ

m or less.

2. The laminated body according to claim 1,

wherein the fiber layer contains fine cellulose fibers each having a fiber diameter of 1 nm or more and 30 nm or less.

3. The laminated body according to claim 2,

wherein the fiber layer contains the fine cellulose fibers each having a fiber diameter of 1 nm or more and 30 nm or less in an amount of 10 mass % or more and 99 mass % or less, and contains fine cellulose fibers each having a fiber diameter of 100 nm or more and 10 μ

m or less in an amount of 1 mass % or more and 90 mass % or less.

4. The laminated body according to claim 3,

wherein the fine cellulose fibers have a crystallinity of 70% or more and 100% or less.

5. The laminated body according to claim 4,

wherein the fine cellulose fibers have 0.1 mmol/g or more and 3.5 mmol/g or less of a carboxyl group with respect to cellulose mass.

6. The laminated body according to claim 5,

wherein the bending elastic modulus of the fiber layer is 2 GPa or more and 30 GPa or less.

7. The laminated body according to claim 6,

wherein the arithmetic mean roughness (Ra) of the surface of the fiber layer is 100 nm or more and 2000 nm or less.

8. The laminated body according to claim 7,

wherein the thickness of the fiber layer is 100 nm or more and 2000 nm or less.

9. The laminated body according to claim 8,

wherein oxygen permeability at a temperature of 30°

C. and at a humidity of 70% is within a range of 0.001 cm³/m²·

atm·

day or more and 10 cm³/m²·

atm·

day or less.

10. The laminated body according to claim 8,

wherein water vapor permeability at a temperature of 40°

C. and at a humidity of 90% is within a range of 0.0000001 g/m²/day or more and 50 g/m²/day or less.

11. The laminated body according to claim 8,

wherein the oil resistance evaluated according to the JAPAN TAPPI paper pulp test method No. 41 has a kit number of 10 or more.

12. The laminated body according to claim 2,

wherein the fiber layer further contains an inorganic layered mineral.

13. The laminated body according to claim 2,

wherein the fiber layer further contains a composite material with a silica compound, shown in the following General Formula (1), or its hydrolyzate

wherein, in the following General Formula (1), X1, X2, X3, and X4 are the same or are different from each other, and are any one of a hydroxyl group, an alkoxy group, and an alkyl group.

14. The laminated body according to claim 2,

wherein the thickness of a mixed layer of the base and the fiber layer is 10 nm or more and 2000 nm or less.

15. The laminated body according to claim 2,

wherein the fiber layer and a thin film layer made of metal or metal oxide are provided on at least one surface of the base.

16. The laminated body comprising a resin layer or a sealant layer further provided on at least one surface of the laminated body according to claim 2.

17. A molded container using the laminated body according to claim 2.

18. A method for producing a laminated body comprising:

coating a coating liquid containing fine cellulose fibers each having a fiber diameter of 1 nm or more and 10 μ

m or less on at least one surface of a base made of paper, to form a coating film; and

drying the coating film to form a laminated body.

19. The method for producing a laminated body according to claim 18,

wherein the coating liquid has a solid content concentration of 1% and a transmissivity of 0.1% or more and 70% or less.