Hard coat film, antireflection hard coat film, optical element and image display

• US 7,569,269 B2
• Filed: 09/26/2005
• Issued: 08/04/2009
• Est. Priority Date: 10/06/2004
• Status: Expired due to Fees

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Hamamoto, Daisuke, Takada, Katsunori, Shigematsu, Takayuki
• Primary Examiner(s): Ahmed; Sheeba
• Application Number:
  US10/588,548
• Publication Number:
  US 20070178297A1
• Time in Patent Office: 1,408 Days
• Field of Search: None
• US Class Current: 428/323
• CPC Class Codes: C08G 18/673 containing two or more acrylate or alkylacrylate ester groups
• CPC Class Codes: C08G 18/755 and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
• CPC Class Codes: C08J 2475/00 Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
• CPC Class Codes: C08J 7/0427 with only one layer of a composition containing a polymer binder with more layers C08J7/042
• CPC Class Codes: C08J 7/043 Improving the adhesiveness of the coatings per se, e.g. forming primers adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50
• CPC Class Codes: C08J 7/046 Forming abrasion-resistant coatings; Forming surface-hardening coatings
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C08K 3/36 Silica
• CPC Class Codes: C08K 7/26 Silicon- containing compounds
• CPC Class Codes: C09D 175/16 having terminal carbon-to-carbon unsaturated bonds
• CPC Class Codes: C09D 4/00 Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
• CPC Class Codes: C09D 5/006 Anti-reflective coatings
• CPC Class Codes: C09D 7/61 inorganic
• CPC Class Codes: C09D 7/67 Particle size smaller than 100 nm
• CPC Class Codes: G02B 1/111 using layers comprising organic materials
• 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 428/256 Heavy metal or aluminum or compound thereof
• CPC Class Codes: Y10T 428/257 Iron oxide or aluminum oxide
• CPC Class Codes: Y10T 428/259 Silicic material
• 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 428/269 : including synthetic resin or polymer layer or component
• CPC Class Codes: Y10T 428/31551 : Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]

Abstract

A hard coat film of the present invention comprises a hard coat layer, which is a cured coat layer, provided on at least one side of a transparent plastic film substrate, wherein a hard coat layer forming material comprises urethane acrylate (A); isocyanuric acid acrylate (B) and inorganic ultrafine particles (C), and has a high hardness and suppresses curling due to cracking and cure shrinkage.

Claims

1. A hard coat film comprising a hard coat layer, which is a cured coat layer, provided on at least one side of a transparent plastic film substrate, wherein

a hard coat layer forming material comprises:

urethane acrylate (A);

isocyanuric acid acrylate (B) and inorganic ultrafine particles (C), and

a mixing quantity of the isocyanuric acid acrylate (B) is about in the range of from 5 to 25 parts by weight relative to 100 parts by weight of the urethane acrylate (A),

a mixing quantity of the inorganic ultrafine particles (C) is about in the range of from 10 to 60 parts by weight relative to all resin components in a hard coat forming material, and

a difference in refractive index between the transparent plastic film substrate and the hard coat layer is 0.04 or less.

2. The hard coat film according to claim 1, wherein the ultrafine particles (C) are at least one metal oxide selected from the group consisting of titanium oxide, silicon oxide, aluminum oxide, zinc oxide, tin oxide and zirconium oxide.

3. The hard coat film according to claim 1, wherein an average particle diameter of inorganic ultrafine particles (C) is 100 nm or less.

4. The hard coat film according to claim 1, wherein a thickness of the hard coat layer is in the range of from 15 to 50 μ

m.

5. The hard coat film according to claim 1, having a pencil hardness of 4H or higher.

6. An antireflection hard coat film comprising the hard coat film according to claim 1 and an antireflection layer formed on the hard coat layer of the hard coat film.

7. The antireflection hard coat film according to claim 6, wherein ultrafine particles of silicon oxide each in the shape of a hollow sphere are contained in the antireflection layer.

8. An optical element comprising the hard coat film according to claim 1 laminated on one side or both sides of an optical element.

9. An optical element comprising the antireflection hard coat film according to claim 6 laminated on one side or both sides of an optical element.

10. An image display comprising a hard coat film according to claim 1.

11. An image display comprising a hard coat film according to claim 2.

12. An image display comprising a hard coat film according to claim 3.

13. An image display comprising a hard coat film according to claim 4.

14. An image display comprising a hard coat film according to claim 5.

15. An image display comprising an antireflection hard coat film according to claim 6.

16. An image display comprising an antireflection hard coat film according to claim 7.

17. An image display comprising an optical element according to claim 8.

18. An image display comprising an optical element according to claim 9.