Hardcoat film, antireflection film and equipment for display

• US 7,332,213 B2
• Filed: 06/30/2004
• Issued: 02/19/2008
• Est. Priority Date: 06/30/2003
• Status: Expired due to Fees

• Current Assignee: Toray Industries Incorporated
• Original Assignee: Toray Industries Incorporated
• Inventors: Yoshida, Minoru, Kojima, Satoshi, Mimura, Takashi, Minamiguchi, Hisashi, Tsuchimoto, Tatsuro
• Primary Examiner(s): Cano; Milton I.
• Assistant Examiner(s): Joy; David J.
• Application Number:
  US10/879,595
• Publication Number:
  US 20050008863A1
• Time in Patent Office: 1,329 Days
• Field of Search: 428/212, 428/201, 428/141, 428/409, 428/423.7, 428/424.4, 428/480, 428/520, 428/522
• US Class Current: 428/212
• CPC Class Codes: G02B 1/11 Anti-reflection coatings
• CPC Class Codes: Y10T 428/24355 Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
• CPC Class Codes: Y10T 428/24851 Intermediate layer is discontinuous or differential
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree
• CPC Class Codes: Y10T 428/31 Surface property or characteristic of web, sheet or block
• CPC Class Codes: Y10T 428/31565 Next to polyester [polyethylene terephthalate, etc.]
• CPC Class Codes: Y10T 428/31576 Ester monomer type [polyvinylacetate, etc.]
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]
• CPC Class Codes: Y10T 428/31928 Ester, halide or nitrile of addition polymer
• CPC Class Codes: Y10T 428/31935 Ester, halide or nitrile of addition polymer

Abstract

A hardcoat film comprises a substrate film, and a hardcoat layer laminated on at least one side of the substrate film, wherein a reflectance of the hardcoat layer at a wavelength within 400 to 600 nm has a mean ripple amplitude of 1% or less. The hardcoat film has decreased iris patterns. There is also provided an antireflection film having a low surface reflectance and a neutral tone of color, and an equipment for display including the film.

Claims

1. A hardcoat film comprising:

a substrate film, and

a hardcoat layer laminated on at least one side of the substrate film, said substrate film having discontinuous protrusions formed between the substrate film and the hardcoat layer amplitude of 1% or less.

2. A hardcoat film according to claim 1, wherein the hardcoat layer has a surface reflectance of 6% or less and a haze of 6% or less.

3. A hardcoat film according to claim 1, wherein the reflectance of the hardcoat layer at a wavelength within 600 to 740 nm has a mean ripple amplitude of 2% or less.

4. A hardcoat film according to claim 1, wherein the hardcoat layer is provided by a composition containing 10 to 80 percent by weight of a multi-functional acrylate compound including at least one hydroxyl group, 1 to 30 percent by weight of a polyisocyanate compound, and 0.001 to 10 percent by weight of an organic metal catalyst.

5. A hardcoat film according to claim 4, wherein the organic metal catalyst is selected from an organic tin compound, an organic aluminum compound and an organic compound containing a 4 group element.

6. A hardcoat film according to claim 4, wherein the polyisocyanate compound is an aliphatic polyisocyanate compound.

7. A hardcoat film according to claim 1, wherein the substrate film is a polyester film.

8. An antireflection film comprising:

the hardcoat film to claim 1, and

a high refractive index layer and a low refractive index layer sequentially laminated over the hardcoat layer,

wherein the surface reflection spectrum at a wavelength within 400 to 700 nm satisfies all the following three conditions;

(1) a minimum reflectance of 0.6% or less,

(2) a reflectance at a wavelength of 400 nm of 3.5% or less, and

(3) a reflectance at a wavelength of 700 nm of 3% or less.

9. An antireflection film according to claim 8, wherein the surface reflection spectrum at a wavelength within 400 to 700 nm has a maximum amplitude of 0.5% or less.

10. An antireflection film according to claim 8, wherein the surface reflection spectrum at a wavelength within 400 to 700 nm has a maximum amplitude of 0.2% or less.

11. An antireflection film according to claim 8, wherein the low refractive index layer has a refractive index of 1.42 or less, and the difference in refractive indices between the low refractive index layer and the high refractive index layer is 0.15 or more.

12. An antireflection film according to claim 8, wherein the low refractive index layer has a porosity of 5% or more.

13. An antireflection film according to claim 8, wherein the substrate film is at least one selected from polyester, acetate and an acrylic resin.

14. An equipment for display comprising the antireflection film of claim 8 adhered to a front side of a display panel or a transparent optical filter.

15. A hardcoat film comprising:

a substrate film comprising polyester, and

a hardcoat layer comprising an acrylic resin, laminated on at least one side of the substrate film,

wherein an adhesion-promoting layer comprising a water-dispersing polyester-based resin is disposed between the substrate film and the hardcoat layer; and

the adhesion-promoting layer has a refractive index which satisfies the equation;

(refractive index of the adhesion-promoting layer)={(refractive index of the substrate film)}×

(refractive index of the hardcoat layer)}½

+0.02; and

a reflectance of the hardcoat layer at a wavelength from 400 to 600 nm has a mean ripple amplitude of 1% or less.

16. An antireflection film comprising:

the hardcoat film of claim 15, and

a high refractive index layer and a low refractive index layer sequentially laminated over the hardcoat film,

wherein the surface reflection spectrum at a wavelength from 400 to 700 nm satisfies all the following conditions;

(1) a minimum reflectance of 0.6% or less,

(2) a reflectance at a wavelength of 400 nm of 3.5% or less, and

(3) a reflectance at a wavelength of 700 nm of 3% or less.