Antireflective film, polarizing plate and image display device

• US 20080118669A1
• Filed: 11/20/2007
• Published: 05/22/2008
• Est. Priority Date: 11/22/2006
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: INOUE, Rikio, MIFUNE, Hiroyuki, YONEYAMA, Hiroyuki
• Granted Patent: US 8,137,767 B2
• Time in Patent Office: Days
• US Class Current: 428/1.31
• CPC Class Codes: C09K 2323/03 Viewing layer characterised by chemical composition
• CPC Class Codes: C09K 2323/031 Polarizer or dye
• CPC Class Codes: C09K 2323/04 Charge transferring layer characterised by chemical composition, i.e. conductive
• CPC Class Codes: G02B 1/111 using layers comprising organic materials
• CPC Class Codes: G02B 2207/121 Antistatic or EM shielding layer
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree
• CPC Class Codes: Y10T 428/31504 Composite [nonstructural laminate]

Abstract

An antireflective film is provided and includes: a transparent substrate; at least one conductive layer formed from a composition including at least one transparent conductive polymeric material and a compound forming a cross-liking site, the compound having a plurality of cross-linking reactive groups, at least one of which cross-links with the transparent conductive polymeric material; and at least one low refractive index layer.

Claims

1. An antireflective film comprising:

a transparent substrate;

a conductive layer formed from a composition including a transparent conductive polymeric material and a compound forming a cross-liking site, the compound having a plurality of cross-linking reactive groups, at least one of which cross-links with the transparent conductive polymeric material; and

a low refractive index layer.

2. The antireflective film of claim 1, further comprising at least one layer of a hard coating layer and an antiglare layer between the transparent substrate and the conductive layer.

3. The antireflective film of claim 1, wherein the transparent conductive polymeric material is a complex of a π

-conjugated conductive polymer and a polymer dopant.

4. The antireflective film of claim 3, wherein the polymer dopant has at least one anionic group and at least one non-anionic group.

5. The antireflective film of claim 3, wherein the compound forming a cross-linking site has a group cross-linking with the polymer dopant.

6. The antireflective film of claim 3, wherein the compound forming a cross-linking site is one of:

a compound having a group capable of cross-linking with the polymer dopant and a group having an ethylenically unsaturated double bond; and

an oligomer having a group capable of cross-linking with the polymer dopant and a group having an ethylenically unsaturated double bond.

7. The antireflective film of claim 3, wherein the compound forming a cross-linking site is at least one of:

a hydrolysate of a mixture of a compound represented by formula (1) and a compound represented by formula (2); and

a condensate of the hydrolysate;

(R¹)_m-M¹-(OR³)_n  

 

(1)

(R²)_p-M²-(OR⁴)_q  

 

(2)

wherein R¹ is a group having as a partial structure a group cross-linking with the polymer dopant, R³s are the same or different and each is an alkyl group or a haloalkyl group, n is 1 or above, m is 1 or above, M¹ is silicon, aluminum, zirconium, titanium, tin or antimony, R² is a group having as a partial structure an ethylenically unsaturated double bond, R⁴s are the same or different and each is an alkyl group or a haloalkyl group, p is 1 or above, q is 1 or above, and M² is silicon, aluminum, zirconium, titanium, tin or antimony.

8. The antireflective film of claim 1, further comprising:

a middle refractive index layer and a high refractive index layer between the conductive layer and the low refractive index layer, wherein the middle refractive index layer, the high refractive index layer and the low refractive index layer are arranged in increasing order of distance from the transparent substrate, the middle refractive index layer has a refractive index of 1.5 to 1.7, the high refractive index layer has a refractive index of 1.7 to 2.1, and the low refractive index layer has a refractive index of 1.3 to 1.5.

9. A polarizing plate comprising:

a polarizer; and

two protective films sandwiching the polarizer therebetween, at least one of the two protective films being an antireflective film of claim 1.

10. An image display device comprising a polarizing plate of claim 9.