Antireflective film, polarizing plate, and image display device

Patent metadata

Field	Value
Publication number	US-9279913-B2
Application number	US-50671709-A
Country	US
Kind code	B2
Filing date	Jul 21, 2009
Priority date	Jul 22, 2008
Publication date	Mar 8, 2016
Grant date	Mar 8, 2016

Abstract

An antireflective film is provided, the antireflective film including: a transparent support; and at least one low refractive index layer, wherein the low refractive index layer is formed from a composition containing at least following (A) to (C): (A) a fluorine-containing antifouling agent having at least one polymerizable unsaturated group; (B) a fluorine-containing copolymer having at least one polymerizable unsaturated group; and (C) inorganic fine particles.

First claim

What is claimed is:

1. An antireflective film, comprising:
a transparent support; and
at least one low refractive index layer,
wherein the low refractive index layer is formed from a composition containing the following (A) to (C):
(A) a fluorine-containing antifouling agent having at least one polymerizable unsaturated group;
(B) a fluorine-containing copolymer having at least one polymerizable unsaturated group; and
(C) inorganic fine particles,

the fluorine-containing antifouling agent having a polymerizable unsaturated group (A) has a weight average molecular weight of 400 or more and less than 5000, and
the fluorine-containing antifouling agent having a polymerizable unsaturated group (A) is represented by Formula (F):
(Rf 1 )—[(W)—(R A ) n ] m   Formula (F)

wherein Rf represents a (per)fluoroalkyl group or a (per)fluoropolyether group, W represents a single bond or a linking group, R A represents a functional group having an unsaturated double bond, n represents an integer of 1 to 3, and m represents an integer of 1 to 3;
wherein the composition further contains a polyfunctional monomer having 3 or more polymerizable unsaturated groups (D) represented by formula limitation (2), (3), (4), or (5):
Rf 2 —{CH 2 —OC(O)CH═CH 2 } n   formula (2)

Rf 2 —{C(O)OCH═CH 2 } n   formula (3)

Rf 21 —{Rf 22 —CH 2 —OC(O)CH═CH 2 } n   formula (4)

Rf 21 —{Rf 22—C(O)OCH═CH 2 } n   formula (5)

wherein Rf 2 represents an n-valent group consisting of a carbon atom(s) and a fluorine atom(s), or an n-valent group consisting of a carbon atom(s), a fluorine atom(s) and an oxygen atom(s);
Rf 21 represents an n-valent group having at least a carbon atom and a fluorine atom;
Rf 22 represents a divalent group having at least a carbon atom and a fluorine atom;
and n represents an integer of 3 or more,
wherein the polyfunctional monomer contains 35% by weight or more of fluorine and has a calculated value of entire intercrosslink molecular weight of less than 500.

2. The antireflective film according to claim 1 ,
wherein the fluorine-containing antifouling agent having a polymerizable unsaturated group (A) has a perfluoropolyether structure, and R A represents a plurality of polymerizable unsaturated groups in one molecule of the fluorine-containing antifouling agent.

3. The antireflective film according to claim 2 , wherein the plurality of polymerizable unsaturated groups is four or more and 9 or less.

4. The antireflective film according to claim 1 ,
wherein the fluorine-containing copolymer having a polymerizable unsaturated group (B) has a weight average molecular weight of 5000 or more and less than 500000.

5. The antireflective film according to claim 1 ,
wherein the inorganic fine particles (C) are hollow silica particles.

6. The antireflective film according to claim 1 ,
wherein color tint of regular reflecting light for incident light at an angle of 5° of a CIE standard light source D65 in a wavelength region from 380 to 780 nm satisfies following conditions that a* value and b* value in CIE1976 L*a*b* color space are in ranges of 0≦a*≦8 and −10≦b*≦0, respectively, and within this color tint variation range, a color difference ΔE due to 2.5% variation in a thickness of an arbitrary layer out of the layers contained in the antireflective film falls in a range of equation (5):
Δ 9 E ={( L*−L *′) 2 +( a*−a *′) 2 +( b*−b *′) 2 } 1/2 ≦3  equation (5)

wherein L*′, a*′, and b*′ are color tints of reflected light at a designed film thickness.

7. The antireflective film according to claim 1 , further comprising:
a medium refractive index layer and a high refractive index layer, the antireflective film comprising the medium refractive index layer, the high refractive index layer, and the low refractive index layer in this order from a side of the transparent support,
wherein the medium refractive index layer has a refractive index at a wavelength of 550 nm of 1.60 to 1.65 and a thickness of 50.0 nm to 70.0 nm,
the high refractive index layer has a refractive index at a wavelength of 550 nm of 1.70 to 1.74 and a thickness of 90.0 nm to 115.0 nm, and
the low refractive index layer has a refractive index at a wavelength of 550 nm of 1.33 to 1.38 and a thickness of 85.0 nm to 95.0 nm.

8. The antireflective film according to claim 7 ,
wherein at least one of the medium refractive index layer and the high refractive index layer contains conductive inorganic fine particles.

9. The antireflective film according to claim 8 ,
wherein the conductive inorganic fine particles contain at least one metal oxide selected from the group consisting of tin-doped indium oxide, antimony-doped tin oxide, fluorine-doped tin oxide, phosphorous-doped tin oxide, zinc antimonate, indium-doped zinc oxide, zinc oxide, ruthenium oxide, rhenium oxide, silver oxide, nickel oxide, and copper oxide.

10. The antireflective film according to claim 1 , wherein a content of the component (A) is 1 to 15% by mass, a content of the component (B) is 5-70% by mass, a content of the component (C) is 10-70% by mass, and a content of the component (D) is 5-60% by mass, with respect to a total solid component in the composition.

11. A polarizing plate, comprising:
a polarizing film; and
two protective films that protect both sides of the polarizing film,
wherein at least one of the two protective films is the antireflective film according to claim 1 .

12. An image display device, comprising:
a display; and
the antireflective film according to claim 1 provided at an outermost surface of the display.

13. An antireflecfive film, comprising:
a transparent support; and
at least one low refractive index layer,
wherein the low refractive index layer is formed from a composition containing the following (A) to (C):
(A) a fluorine-containing antifouling agent having at least one polymerizable unsaturated group;
(B) a fluorine-containing copolymer having at least one polymerizable unsaturated group; and
(C) inorganic fine particles,

wherein the fluorine-containing antifouling agent having a polymerizable unsaturated group (A) has at least one perfluoroalkyl group or perfluoroether group,
wherein the composition further contains a polyfunctional monomer having 3 or more polymerizable unsaturated groups (D) represented by formula (2), (3), (4), or (5);
Rf 2 —{CH 2 —OC(O)CH═CH 2 } n   formula (2)

Rf 2 —{C(O)OCH═CH 2 } n   formula (3)

Rf 21 —{Rf 22 —CH 2 —OC(O)CH═CH 2 } n   formula (4)

Rf 21 —{Rf 22—C(O)OCH═CH 2 } n   formula (5)

wherein Rf 2 represents an n-valent group consisting of a carbon atom(s) and a fluorine atom(s), or an n-valent group consisting of a carbon atom(s), a fluorine atom(s) and an oxygen atom(s); Rf 21 represents an n-valent group having at least a carbon atom and a fluorine atom; Rf 22 represents a divalent group having at least a carbon atom and a fluorine atom; and n represents an integer of 3 or more, and
wherein the polyfunctional monomer contains 35% by weight or more of fluorine and has a calculated value of entire intercrosslink molecular weight of less than 500.

14. The antireflective film according to claim 13 ,
wherein the fluorine-containing antifouling agent having a polymerizable unsaturated group (A) has a weight average molecular weight of 400 or more and less than 5000.

15. The antirefiective film according claim 13 , wherein a content of the component (A) is 1 to 15% by mass, a content of the component (B) is 5-70% by mass, a content of the component (C) is 10-70% by mass, and a content of the component (D) is 5-60% by mass, with re

Assignees

• Wakizaka Daiki
• Asahi Miho
• Suzuki Takato
• Fujifilm Corp

Inventors

• Wakizaka Daiki
• Asahi Miho
• Suzuki Takato

Classifications

• Y10T428/24612

  Composite web or sheet · CPC title

• Y10T428/24942

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

• G02B1/111 Primary

  using layers comprising organic materials · CPC title

• G02B5/3033

  in the form of a thin sheet or foil, e.g. Polaroid · CPC title

• Y10T428/3154

  Of fluorinated addition polymer from unsaturated monomers · CPC title