ANTISTATIC LAMINATE AND LAMINATE MATERIAL INCLUDING THE SAME

• US 20130011663A1
• Filed: 03/03/2011
• Published: 01/10/2013
• 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
• Granted Patent: US 9,302,447 B2
• Time in Patent Office: Days
• US Class Current: 428/332
• CPC Class Codes: B32B 2262/04 Cellulosic plastic fibres, e.g. rayon
• CPC Class Codes: B32B 23/06 of paper or cardboard
• CPC Class Codes: B32B 23/08 of synthetic resin
• CPC Class Codes: B32B 2307/21 Anti-static
• CPC Class Codes: B32B 27/12 next to a fibrous or filamentary layer
• CPC Class Codes: H01L 23/60 Protection against electrostatic charges or discharges, e.g. Faraday shields
• 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

An antistatic laminate and a laminate material equipped with the laminate are provided, wherein the laminate includes a base material and an antistatic layer which comprises a cellulose fiber having a carboxyl group, and the laminate can prevent deterioration of antistatic properties under a low humidity environment, while high transparency is maintained due to use of a material wherein natural resources are effectively used.

Claims

1. An antistatic laminate which includes laminated plural layers and is used to prevent charging, the laminate comprising:

a base material and an antistatic layer which is laminated on at least one surface side of the base material, and

the antistatic layer includes a cellulose fiber having a carboxyl group.

2. The antistatic laminate according to claim 1, wherein the cellulose fiber is a cellulose fiber to which a carboxyl group is introduced by an acid reaction, and the content of the carboxyl group per 1 g of the cellulose fiber is in a range of 0.1 mmol or more and 5 mmol or less.

3. The antistatic laminate according to claim 2, wherein at least a part of the carboxyl group is a carboxyl acid salt.

4. The antistatic laminate according to claim 3, wherein a fiber width of the cellulose fiber is 2 nm or more and 50 nm or less, and a length of the cellulose fiber is 1 μ

m or more.

5. The antistatic laminate according to claim 4, wherein the cellulose fiber is a crystalline cellulose, and has a crystalline structure of cellulose type-I.

6. The antistatic laminate according to claim 5, wherein the antistatic layer further includes a water absorbent.

7. The antistatic laminate according to claim 6, wherein a weight ratio of the cellulose fiber and the water absorbent (cellulose fiber/water absorbent) is in a range of (5/95) or more and (95/5) or less.

8. The antistatic laminate according to claim 7, wherein the water absorbent is an inorganic lamellar compound.

9. The antistatic laminate according to claim 8, wherein a weight ratio of the cellulose fiber and the inorganic lamellar compound (cellulose fiber/inorganic lamellar compound) which are included in the antistatic layer is in a range of (20/80) or more and (70/30) or less.

10. The antistatic laminate according to claim 9, wherein the thickness of the antistatic layer is 100 nm or more.

11. The antistatic laminate according to claim 9, wherein electrical resistance at the surface of the antistatic laminate is 1.0×

1012Ω

/□

or less under an environment of 25°

C. and 20% RH.

12. The antistatic laminate according to claim 9, wherein a half-life of surface charge at the surface of the antistatic laminate is 10 seconds or less under an environment of 25°

C. and 20% RH.

13. The antistatic laminate according to claim 9, wherein the base material is made from plastic, and haze of the antistatic laminate is in a range of 0.1% or more and 10% or less.

14. The antistatic laminate according to claim 9, wherein the base material is made from paper.

15. A laminate material which includes the antistatic laminate according to claim 9.