Antistatic hard coat film

• US 6,146,753 A
• Filed: 05/21/1998
• Issued: 11/14/2000
• Est. Priority Date: 05/26/1997
• Status: Expired due to Term

• Current Assignee: Dai Nippon Printing Company Limited
• Original Assignee: Dai Nippon Printing Company Limited
• Inventors: Niimi, Takahiro, Katagiri, Hiroomi, Tsuchiya, Mitsuru
• Primary Examiner(s): Krynski, William
• Assistant Examiner(s): SHEWAREGED, BETELHEM
• Application Number:
  US09/083,428
• Time in Patent Office: 908 Days
• Field of Search: 428/206, 428/208, 428/323, 428/480, 428/403, 428/407, 428/922, 428/926, 361/212
• US Class Current: 428/332
• CPC Class Codes: C03C 17/34 with at least two coatings having different compositions C03C17/44 takes precedence
• CPC Class Codes: C03C 17/3405 with at least two coatings of organic materials C03C17/36, C03C17/42 take precedence
• CPC Class Codes: G02B 1/14 Protective coatings, e.g. hard coatings
• CPC Class Codes: G02B 1/16 having an anti-static effect, e.g. electrically conducting coatings
• CPC Class Codes: Y10T 428/24893 including particulate material
• CPC Class Codes: Y10T 428/24909 Free metal or mineral containing
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/26 Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
• CPC Class Codes: Y10T 428/31 Surface property or characteristic of web, sheet or block
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]

Abstract

An antistatic hard coat film for various displays is provided which can prevent electrostatic deposition of foreign materials and at the same time possesses excellent scratch resistance and hardness high enough not to cause a deterioration in transparency upon being rubbed. The antistatic hard coat film 5 comprises: a transparent substrate film 1; a transparent conductive layer 2, having a surface resistivity of preferably not more than 10¹² Ω/□, provided on the substrate film 1; and a hard coat 3 provided on the transparent conductive layer 2, the hard coat 3 preferably having such an anisotropic conductivity that the resistivity in the layer surface direction is higher than the resistivity in the layer thickness direction.

Claims

1. An antistatic hard coat film comprising:

a transparent substrate film;

a transparent conductive layer having a surface resistivity of not more than 10¹² Ω

/□

; and

a hard coat layer having a volume resistivity in the thickness direction of not more than 10⁸ Ω

·

cm provided on the transparent conductive layer, said hard coat layer comprising hard coat resin containing conductive fine particles, the diameter of the conductive fine particles being not less than one-third of the coating thickness of the conductive layer.

2. The antistatic hard coat film according to claim 1, wherein the hard coat layer comprises a reaction-curing resin composition.

3. The antistatic hard coat film according to claim 2, wherein the hard coat layer has a thickness of 1 to 50 μ

m.

4. The antistatic hard coat film according to claim 1, wherein the conductive fine particles are particles that have been surface treated with gold and/or nickel.

5. The antistatic hard coat film according to claim 4, wherein the particles are selected from the group consisting of silica, carbon black, metallic, and resin particles.