JP2001264511A - Antireflection member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antireflection member excellent in stain-proofing performance such as suitability to the wiping of fingerprints. SOLUTION: In the antireflection member obtained by disposing a low refractive index monolayer and an antireflection layer formed by alternately laminating high refractive index layers and low refractive index layers or laminating a middle refractive index layer, a high refractive index layer, a low refractive index layer and a stain-proofing layer on at least one face of a substrate, a middle layer comprising a metal, ceramics or the like is interposed between the top low refractive index layer and the stain-proofing layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antireflection member having antifouling properties. More specifically, the present invention relates to a configuration for quickly fixing an antifouling agent.

[0002]

2. Description of the Related Art In an optical member having an anti-reflection film such as a lens, dirt due to sweat, fingerprints and the like easily adheres, and it is difficult to remove dirt once adhered. As means for solving these problems, an antifouling layer or a water repellent layer using a thin film of fluoroalkylsilane or the like has been proposed.

[0003] As disclosed in JP-A-5-215905, a fluoroalkylsilazane formed by using a vacuum evaporation method, as disclosed in JP-A-6-122778, a fluoroalkylsilane formed by using a plasma CVD method, In the case of a water-repellent layer such as a mixture of a fluorine compound and an organopolysiloxane as disclosed in JP-A-8-209118, the material itself has a strong reactivity or a high fixing property caused by a plasma assisting action. The original water repellency of the material could be exhibited.

However, the demand for antifouling performance has increased,
When an antifouling layer having a surface slippery material or a fluorine compound having a flexible molecular structure having an ether bond as disclosed in JP-A-9-61605 is developed, the antifouling performance of the material itself is improved. However, at the same time, the low reactivity was aggravated by the poor reactivity and the fixing property was lowered, and the original antifouling performance of the material could not be exhibited due to the fingerprint wiping property and the like.

[0005] The material itself has a flexible molecular structure as represented by an ether bond, which plays an essential role in exhibiting antifouling performance, and if the reactivity of the terminal functional group is too high. It has been found that three-dimensional crosslinking occurs and inhibits a flexible structure, that is, an antifouling property.

[0006]

However, the above-mentioned antifouling agent having excellent antifouling performance has excellent penetrability and is slightly weak in reactivity, so that it has poor fixability and soaks in a base material. Therefore, there is a disadvantage that the original antifouling performance of the material is not exhibited.

The present invention has been made in view of the above-mentioned drawbacks, and has as its object to provide an antireflection member having excellent antifouling performance such as fingerprint wiping properties.

[0008]

A low refractive index single layer, a high refractive index layer and a low refractive index layer are alternately laminated on at least one surface of a substrate, or an intermediate refractive index layer, a high refractive index layer, An anti-reflection member provided with an anti-reflection layer in which a low-refractive-index layer and an anti-fouling layer are laminated, characterized in that an intermediate layer made of metal or ceramics is laminated between the low-refractive-index layer on the top layer and the anti-fouling layer. And

The intermediate layer is made of Ti, Al, Si, Ni, C
It is characterized by being a metal film formed by vapor deposition or sputtering of r, Ag, Pt or the like.

The intermediate layer is an oxide film formed by vapor deposition or sputtering of titanium oxide, aluminum oxide, magnesium oxide, or the like.

The intermediate layer functions as a barrier layer by preventing permeation of the antifouling agent, or by exerting a catalytic effect of accelerating the reaction of the terminal functional group, thereby improving the fixability of the antifouling agent. Improves antifouling performance.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
FIG. 1 shows a case where a hard coat layer, an antireflection layer, and an antifouling layer are laminated on one surface of a substrate.

As the substrate 1, a display member made of plastic or glass, a spectacle lens, or a film substrate made of polyester, polycarbonate, polyacetyl cellulose or the like is appropriately selected depending on the purpose and application.

As the hard coat layer 2, an acrylic or silicon resin material is used. Coating is performed to a thickness of 3 to 20 μm using an ultraviolet curing method or a heat curing method. Transparent particles having an average particle size of 0.01 to 3 μm can be dispersed in the hard coat layer to perform a light diffusion treatment called antiglare.

Examples of the high refractive index material of the antireflection layer 3 include titanium oxide, zirconium oxide, niobium oxide, and ITO, but are not particularly limited as long as the refractive index is n = 1.80 or more. Absent.

Examples of the material having a low refractive index for the antireflection layer 3 include silicon oxide, magnesium fluoride, calcium fluoride and barium fluoride. However, the material is not particularly limited as long as the material has a refractive index n = 1.60 or less. Not something.

These materials are formed by a vacuum evaporation method, a sputtering method, an ion plating method or the like. Each layer has an optical thickness of 10 to 200 nm.

The intermediate layer 4 is made of Ti, Al,
Si, Ni, Cr, Ag, Pt, etc., and the ceramic film include titanium oxide, aluminum oxide, silicon oxide, magnesium oxide and the like.

These materials are formed by vacuum deposition, sputtering, ion plating, or the like. However, the thickness of the layer needs to be 10 nm or less in optical film thickness so as not to impair the antireflection function.

The antifouling layer 5 is made of an antifouling agent comprising an organic silane compound having a perfluoropolyether group and having an average molecular weight of 1,000 to 10,000.

In particular, R _f- (OC ₃ F ₆ ) _n -O- (C
_{F 2) m - (CH 2} ) l -O- (CH 2) s -Si
(R) ₃ (where R _f is a linear or branched perfluoroalkyl group having 1 to 16 carbon atoms, particularly CF ₃ −,
C ₂ F ₅ − and C ₃ F ₇ − are preferred.

R is a hydrolyzing group, -Cl, -Br,
^{-I, -OR 1, -OOCR 1,} -OC (R 1) C = C
(R ² ) ₂ , -ON = C (R ¹ ) ₂ , -ON = CR ³ ,
_{^{-N (R 2) 2, -R}} 2 NOCR 1 and the like are preferable.

R ¹ is an aliphatic hydrocarbon group having 1 to 10 carbon atoms such as an alkyl group, or 6 to 20 carbon atoms such as a phenyl group.
R ² is a C 1-5 aliphatic hydrocarbon group such as a hydrogen atom or an alkyl group; R ³ is a C 3-6 divalent aliphatic hydrocarbon group such as an alkylidene group It is.

The hydrolyzable groups in the above-mentioned organosilane compounds can be used not only as one kind but also as a mixture of two or more kinds. In particular, -OCH _3, -OC ₂ H
_5, -OOCCH _3, -NH ₂ are preferred. Further, n is an integer of 1 to 50, m is an integer of 0 to 3, I is an integer of 0 to 3, s is an integer of 0 to 6, provided that 6 ≧ m + 1> 0. (Hereinafter referred to as Compound 1) or a polymer thereof is preferred.

From the viewpoint of the working environment and the control of the film thickness, it is preferable to use the PVD method without using a diluting solvent when forming the antifouling layer, and it is particularly preferable to use the vacuum evaporation method. A film having a thickness of about 5 to 10 nm is formed.

[0026]

Now, the present invention will be described in detail with reference to specific examples.

(Example 1) A polyfunctional acrylic resin was formed as a hard coat layer 2 on a transparent plastic film substrate 1 of triacetyl cellulose 80 μm by an ultraviolet irradiation curing method, and then a high refractive index of the antireflection layer 3 was obtained. As a layer, TiO ₂ was alternately laminated as a low-refractive index layer by SiO ₂ as a low refractive index layer, and various metals were formed as an intermediate layer 4 to a thickness of 2 nm by DC magnetron sputtering. Further, as the antifouling layer 5, an organic silane compound containing a perfluoropolyether group as the compound 1 was formed into a film having a thickness of about 10 nm by a vacuum evaporation method.

The antifouling performance of these antireflection members is shown in the table below. The contact angle was measured using a CA-X type contact angle meter manufactured by Kyowa Interface Science Co., Ltd. The fingerprint wiping property was compared with the easiness of wiping using a commercially available tissue paper with respect to the difficulty of attaching a fingerprint. In general, the contact angle was high, showing excellent fingerprint wiping properties.

Example 2 On the same anti-reflection laminate as in Example 1, various oxides were formed to a thickness of 2 nm as the intermediate layer 4 by using a vacuum evaporation method. Further, as the antifouling layer 5, an organic silane compound containing a perfluoropolyether group of the compound 1 was formed to a thickness of about 10 nm by a vacuum evaporation method.

The antifouling performance of these antireflection members is shown in the table below. In general, the contact angle was high, showing excellent fingerprint wiping properties.

Comparative Example 3 An organic silane compound containing a perfluoropolyether group of Compound 1 was formed as an antifouling layer 5 to a thickness of about 10 nm on the same antireflection laminate as in Example 1 by a vacuum evaporation method. .

The antifouling performance of these antireflection members is shown in the table below. Generally, the contact angle was low, and the fingerprint wiping properties were slightly inferior.

[0033]

[Table 1]

[0034]

As described above, according to the constitution of the present invention, it is possible to provide an antireflection member having excellent antifouling performance such as fingerprint wiping properties.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 base material 2 hard coat layer 3 antireflection layer 4 intermediate layer 5 antifouling layer

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C23C 14/08 C23C 14/14 B 14/14 D G02B 1/10 A F-term (Reference) 2K009 AA02 AA05 AA15 BB28 CC01 CC03 CC14 CC24 CC42 DD03 DD04 EE05 4F100 AA05D AA18E AA19E AA20D AA20E AA21C AA21E AA27C AB10E AB11E AB12E AB13E AB16E AB24E AG00A AJ06A AK01A AK25B AK41A AK45A AK52B AK52E BA05 BA07 BA10A BA10E DE01B EH66 GB90 JB13B JB14B JK12B JL06 JL06E JN01B JN06 JN18C JN18D 4K029 AA11 BA03 BA04 BA07 BA12 BA13 BA17 BA35 BA43 BA44 BA46 BA48 BA62 BB02 BC08 BD00 CA01 CA05

Claims (3)

[Claims] 1. A low refractive index monolayer, a high refractive index layer and a low refractive index layer alternately laminated on at least one surface of a substrate, or an intermediate refractive index layer, a high refractive index layer, and a low refractive index layer. An anti-reflection member provided with an anti-reflection layer in which an anti-reflection layer is laminated, wherein an intermediate layer made of metal or ceramics is laminated between the low-refractive-index layer of the uppermost layer and the anti-reflection layer. Element. 2. The method according to claim 1, wherein the intermediate layer comprises Ti, Al, Si, Ni, C
2. The anti-reflection member according to claim 1, wherein the anti-reflection member is a metal film formed by vapor deposition or sputtering of r, Ag, Pt, or the like. 3. The anti-reflection member according to claim 1, wherein said intermediate layer is an oxide film formed by vapor deposition or sputtering of titanium oxide, aluminum oxide, magnesium oxide, or the like.