Composition for Forming Film and Film Sheet

• US 20130022827A1
• Filed: 09/26/2012
• Published: 01/24/2013
• Est. Priority Date: 03/26/2010
• Status: Abandoned Application

• Current Assignee: Toppan Printing Co., Ltd. (TOPPAN Holdings, Inc.)
• Original Assignee: Toppan Printing Co., Ltd. (TOPPAN Holdings, Inc.)
• Inventors: Kimura, Mitsuharu, Oomori, Yumiko, Saiki, Akiko, Imai, Kazuko
• Application Number:
  US13/627,436
• Publication Number:
  US 20130022827A1
• Time in Patent Office: Days
• US Class Current: 428/446
• CPC Class Codes: B32B 2262/062 Cellulose fibres, e.g. cotton
• CPC Class Codes: B32B 2307/724 Permeability to gases, adsorption
• CPC Class Codes: B32B 27/12 next to a fibrous or filamentary layer
• CPC Class Codes: C08K 2201/008 Additives improving gas barrier properties
• CPC Class Codes: C08K 3/346 Clay
• CPC Class Codes: C08K 3/36 Silica
• CPC Class Codes: C08K 5/54 Silicon-containing compounds C08K5/0091 takes precedence
• CPC Class Codes: C08K 5/5425 containing at least one C=C bond
• CPC Class Codes: C08K 5/5435 containing oxygen in a ring
• CPC Class Codes: C08K 5/544 containing nitrogen
• CPC Class Codes: C08L 1/04 Oxycellulose; Hydrocellulose , e.g. microcrystalline cellulose
• CPC Class Codes: C09D 183/04 Polysiloxanes
• CPC Class Codes: D21H 19/32 obtained by reactions forming a linkage containing silicon in the main chain of the macromolecule
• CPC Class Codes: D21H 19/34 comprising cellulose or derivatives thereof

Abstract

The present invention provides a composition for forming a film and its resultant film which has a high level of adhesiveness to a substrate and has good gas barrier properties. The composition for forming a film is prepared by adding a silane coupling agent to an aqueous dispersion liquid in which a cellulose nanofiber is dispersed in an aqueous medium. In addition, the composition for forming a film is also prepared by blending an aqueous dispersion liquid (a) which contains a cellulose nanofiber and has a pH 4-9 with a hydrolysis liquid (b) which contains alkoxysilane hydrolysates and has a pH 2-4 by a weight ratio of “cellulose nanofiber”/“alkoxysilane (in terms of SiO₂)” in the range from 0.1 to 5.

Claims

1. A composition for forming a film, the composition comprising:

a silane coupling agent; and

an aqueous dispersion liquid in which a cellulose nanofiber is dispersed in an aqueous medium.

2. The composition for forming a film according to claim 1, wherein a ratio of said silane coupling agent added to said aqueous dispersion liquid is in the range of 0.5-150 wt % with respect to said cellulose nanofiber.

3. The composition for forming a film according to claim 2, wherein said silane coupling agent includes a silane coupling agent having an amino group.

4. The composition for forming a film according to claim 3, wherein a ratio of said silane coupling agent having an amino group added to said aqueous dispersion liquid is in the range of 0.5-30 wt % with respect to said cellulose nanofiber.

9. The composition for forming a film according to claim 1, wherein said cellulose nanofiber is a crystalline cellulose and has a cellulose I type crystallinity.

11. The composition for forming a film according to claim 9, wherein said cellulose nanofiber comprises oxidized cellulose.

12. The composition for forming a film according to claim 11, wherein said oxidized cellulose is obtained by an oxidation reaction using a nitroxyl radical derivative.

13. The composition for forming a film according to claim 12, further comprising an inorganic layered compound.

14. A film sheet comprising a film formed using said composition for forming a film according to claim 1.

16. The film sheet according to claim 14, wherein said film is laminated on a substrate.

17. The film sheet according to claim 16, wherein a deposited layer comprising an inorganic compound is formed on a surface of said substrate.

19. The film sheet according to claim 17, wherein said deposited layer comprises at least one inorganic compound selected from the group of aluminum oxide, magnesium oxide and silicon oxide.

5. A composition for forming a film comprising:

an aqueous dispersion liquid which contains a cellulose nanofiber and has a pH 4-9; and

a hydrolysis liquid which contains an alkoxysilane and has a pH 2-4, wherein a weight ratio of said cellulose nanofiber to said alkoxysilane in terms of SiO₂ is the range from 0.1 to 5.

6. The composition for forming a film according to claim 5, wherein said alkoxysilane is tetraalkoxysilane.

7. The composition for forming a film according to claim 6, wherein a concentration of said alkoxysilane in terms of SiO₂ in said hydrolysis liquid is 10% by weight or lower.

8. The composition for forming a film according to claim 5, wherein said cellulose nanofiber has an average fiber width of 50 nm or lower and 2.0-4.0 mmol/g of carboxy group amount.

10. The composition for forming a film according to claim 5, wherein said cellulose nanofiber is a crystalline cellulose and has a cellulose I type crystallinity.

15. A film sheet comprising a film formed using said composition for forming a film according to claim 5.

18. The film sheet according to claim 15, wherein said film is laminated on a substrate and a deposited layer comprising an inorganic compound is formed on a surface of said substrate.

20. The film sheet according to claim 18, further comprising a thermoplastic resin layer which makes it possible to weld or adhere by heat.