Hard coat film, polarizing plate, image display device, and method for producing hard coat film

Patent metadata

Field	Value
Publication number	US-9182522-B2
Application number	US-201113639348-A
Country	US
Kind code	B2
Filing date	Apr 13, 2011
Priority date	Apr 15, 2010
Publication date	Nov 10, 2015
Grant date	Nov 10, 2015

Abstract

The present invention provides a hard coat film in which the generation of interference fringes can be reliably prevented. The hard coat film 1 of the present invention includes a transparent film 2 and a hard coat layer 3 provided on the transparent film 2 , wherein an interface 5 that can be detected to form by a reflection spectrum analysis exists between the transparent film 2 and the hard coat layer 3 , and a refractive index continuously varies in the thickness direction in a region 31 from the interface 5 to a thickness-wise middle part of the hard coat layer 3 without forming an interface that can be detected by the reflection spectrum analysis.

First claim

What is claimed is:

1. A hard coat film, comprising:
a transparent film; and
a hard coat layer provided on the transparent film;
wherein an interface that can be detected by a reflection spectrum analysis exists between the transparent film and the hard coat layer, and a refractive index continuously varies in the thickness direction in a region from the interface to a thickness-wise middle part of the hard coat layer without forming an interface that can be detected by the reflection spectrum analysis.

2. A hard coat film, comprising:
a transparent film; and
a hard coat layer provided on the transparent film;
wherein an interface that can be detected by a reflection spectrum analysis exists between the transparent film and the hard coat layer, a transparent film-forming component and a hard coat layer-forming component are present in a region from the interface to a thickness-wise middle part of the hard coat layer, and the transparent film-forming component in the region decreases toward a surface of the hard coat layer without forming an interface that can be detected by the reflection spectrum analysis.

3. The hard coat film according to claim 1 , wherein the hard coat layer has a thickness of 3 μm to 15 μm.

4. The hard coat film according to claim 1 , further comprising an antireflection layer provided on a surface of the hard coat layer.

5. The hard coat film according to claim 1 , wherein a transparent film-forming component and a hard coat layer-forming component are present in a region from the interface to a thickness-wise middle part of the transparent film, and the transparent film-forming component in the region decreases toward a surface of the hard coat layer.

6. A polarizing plate comprising the hard coat film according to claim 1 .

7. An image display device comprising the hard coat film according to claim 1 .

8. The hard coat film of claim 1 , wherein no detectable interface which can be detected by a reflection spectrum analysis is formed in a whole of the thickness direction of the hard coat layer.

9. The hard coat film of claim 2 , wherein no detectable interface which can be detected by a reflection spectrum analysis is formed in a whole of the thickness direction of the hard coat layer.

Assignees

• Kishi Atsushi
• Takemoto Hiroyuki
• Nitto Denko Corp

Inventors

• Kishi Atsushi
• Takemoto Hiroyuki

Classifications

• G02B1/14

  Protective coatings, e.g. hard coatings · CPC title

• Y10T428/24942

  including components having same physical characteristic in differing degree · CPC title

• G02F1/133528

  Polarisers · CPC title

• G02B5/3025

  Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state (G02B5/3008, G02B5/3016 take precedence) · CPC title

• G02B1/11

  Anti-reflection coatings · CPC title