Anti-reflection film having an antistatic hard coat and low refractive index layers and manufacturing method thereof

• US 8,446,673 B2
• Filed: 02/12/2010
• Issued: 05/21/2013
• Est. Priority Date: 02/17/2009
• Status: Active Grant

• Current Assignee: Toppan Printing Co., Ltd. (TOPPAN Holdings, Inc.)
• Original Assignee: Toppan Printing Co., Ltd. (TOPPAN Holdings, Inc.)
• Inventors: Yoshihara, Toshiaki
• Primary Examiner(s): Lavarias, Arnel C
• Application Number:
  US12/705,543
• Publication Number:
  US 20100208350A1
• Time in Patent Office: 1,194 Days
• Field of Search: None
• US Class Current: 359/585
• CPC Class Codes: G02B 1/116 including electrically conducting layers
• CPC Class Codes: G02B 1/118 having sub-optical wavelength surface structures designed to provide an enhanced transmittance, e.g. moth-eye structures
• CPC Class Codes: G02B 1/12 by surface treatment, e.g. by irradiation
• CPC Class Codes: G02B 1/16 having an anti-static effect, e.g. electrically conducting coatings
• CPC Class Codes: Y10T 428/24975 No layer or component greater than 5 mils thick
• CPC Class Codes: Y10T 428/265 1 mil or less

Abstract

An anti-reflection film which has not only sufficient anti-reflection properties and antistatic properties but also excellent optical properties is provided. The anti-reflection film includes an antistatic hard coat layer and a low refractive index layer on a transparent substrate, the antistatic hard coat layer containing conductive particles and a binder matrix, the antistatic hard coat layer including a mixed layer in which the transparent substrate component and the binder matrix blend together with a gradient and a localized layer, the mixed layer being optically indistinguishable and the localized layer being optically distinguishable, and the localized layer having an optical thickness of 50-400 nm.

Claims

1. An anti-reflection film comprising:

a transparent substrate;

an antistatic hard coat layer; and

a low refractive index layer, said antistatic hard coat layer and said low refractive index layer being formed on said transparent substrate, said antistatic hard coat layer containing conductive particles and a binder matrix, said antistatic hard coat layer including a mixed layer in which said binder matrix and a component of said transparent substrate blend together with a gradient and a localized layer which comprises said conductive particles and said binder matrix, said mixed layer being optically indistinguishable, and said localized layer being optically distinguishable and having an optical thickness of 50-400 nm.

2. The anti-reflection film according to claim 1, wherein said optical thickness of said localized layer is 200-350 nm.

3. The anti-reflection film according to claim 1, wherein a content ratio of said conductive particles in said antistatic hard coat layer is 0.5-5 wt % and a content amount of said conductive particles per unit area of said antistatic hard coat layer is 0.05-0.5 g/m².

4. The anti-reflection film according to claim 1, further comprising:

an intermediate layer which is optically indistinguishable and is arranged between said mixed layer and said localized layer.

5. The anti-reflection film according to claim 4, wherein said localized layer has a larger refractive index than said intermediate layer by a difference of 0.01-0.05.

6. The anti-reflection film according to claim 4, wherein said intermediate layer includes 95 wt % or more of said binder matrix.

7. The anti-reflection film according to claim 4, wherein said intermediate layer has a thickness of 2 μ

m or more.

8. The anti-reflection film according to claim 1, wherein said antistatic hard coat layer has a thickness of 3-15 μ

m.

9. The anti-reflection film according to claim 1, wherein said mixed layer has a thickness of 0.5 μ

m or more.

10. The anti-reflection film according to claim 1, wherein a parallel light transmittance thereof is 93.0-97.0%, and a surface resistivity of said low refractive index layer is 1.0×

10⁶ to 1.0×

10¹¹Ω

/□

.

11. The anti-reflection film according to claim 1, wherein an average luminous reflectance on said low refractive index layer surface is 0.5-1.5%, and a reflection hue in an L*a*b* chromaticity coordinate system on said low refractive index layer surface satisfies 0.00≦

a*≦

3.00 and −

3.00≦

b*≦

3.00.

12. The anti-reflection film according to claim 1, wherein said transparent substrate is mainly made of triacetyl cellulose film.