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CN-117425632-B - Anti-reflection glass

CN117425632BCN 117425632 BCN117425632 BCN 117425632BCN-117425632-B

Abstract

An antireflection glass comprising, in order from the glass substrate side, a glass substrate, an antireflection film and a protective layer, wherein the antireflection film is composed of a medium-low refractive index layer having a refractive index of 1.36 to 1.45 and a layer thickness of 150 to 210nm, a medium refractive index layer having a refractive index of 1.56 to 1.79 and a layer thickness of 90 to 140nm, a high refractive index layer having a refractive index of 1.75 to 1.87 and a layer thickness of 30 to 50nm, a low refractive index layer having a refractive index of 1.27 to 1.35 and a layer thickness of 70 to 75nm, the high refractive index layer having a refractive index of 1.43 to 1.48 and a layer thickness of 20 to 30nm, the high refractive index layer, the low refractive index layer and the protective layer containing (A) an aluminum salt solution compound, the average light transmittance at both surfaces at a wavelength of 380 to 780nm being 0.6% or less, and the average light transmittance at a wavelength of 380 to 780nm being 98% or more, the antireflection glass having high antireflection performance and being suitable for alkali-resistant antireflection and excellent production.

Inventors

  • Yokoyama Shochi
  • ISHIKAWA SHOICHI

Assignees

  • 福美化学工业株式会社

Dates

Publication Date
20260505
Application Date
20220624
Priority Date
20210823

Claims (8)

  1. 1. An antireflection glass, characterized by comprising a glass substrate, an antireflection film and a protective layer in this order, The antireflection film is formed from the glass substrate side A medium-low refractive index layer having a refractive index of 1.36 to 1.45 and a layer thickness of 150 to 210nm, A medium refractive index layer having a refractive index of 1.56 to 1.79 and a layer thickness of 90 to 140nm, A high refractive index layer having a refractive index of 1.75 to 1.87 and a layer thickness of 30 to 50nm, A low refractive index layer having a refractive index of 1.27 to 1.35 and a layer thickness of 70 to 75nm The high refractive index layer having a higher refractive index than the medium refractive index layer, The refractive index of the protective layer is 1.43-1.48, the layer thickness is 20-30 nm, The high refractive index layer, the low refractive index layer and the protective layer contain (A) an aluminum salt hydrate, The average light reflectance of both sides at a wavelength of 380 to 780nm is 0.6% or less, the average light transmittance at a wavelength of 380 to 780nm is 98% or more, Further, the medium-low refractive index layer and the medium refractive index layer contain (A) an aluminum salt hydrate, The high refractive index layer is formed of a cured product of a high refractive index layer composition containing (A) 1 to 15 parts by mass of an aluminum salt hydrate and (E) 40 to 130 parts by mass of metal oxide particles, relative to (B) 100 parts by mass of a binder component formed of an alkoxysilane compound represented by the following formula (1) or a hydrolysate thereof, R n -Si(OR 1 ) 4-n (1) Wherein R is an alkyl group, an alkenyl group or an alkoxyalkyl group, R 1 is an alkyl group, an alkoxyalkyl group, an acyloxy group or a halogen atom, and n is an integer of 1 or 2.
  2. 2. The antireflection glass according to claim 1, wherein the protective layer is formed of a cured product of a protective layer composition containing (A) 3 to 25 parts by mass of an aluminum salt hydrate and (C) 1 to 20 parts by mass of a metal chelate compound, relative to (B) 100 parts by mass of a binder component formed of an alkoxysilane compound represented by the following formula (1) or a hydrolysate thereof, R n -Si(OR 1 ) 4-n (1) Wherein R is an alkyl group, an alkenyl group or an alkoxyalkyl group, R 1 is an alkyl group, an alkoxyalkyl group, an acyloxy group or a halogen atom, and n is an integer of 1 or 2.
  3. 3. The antireflection glass according to claim 1, wherein the low refractive index layer is formed of a cured product of a low refractive index layer composition containing (A) 3 to 25 parts by mass of an aluminum salt hydrate, (C) 1 to 20 parts by mass of a metal chelate compound and (D) 25 to 90 parts by mass of silica particles, with respect to 100 parts by mass of (B) a binder component formed of an alkoxysilane compound represented by the following formula (1) or a hydrolysate thereof, R n -Si(OR 1 ) 4-n (1) Wherein R is an alkyl group, an alkenyl group or an alkoxyalkyl group, R 1 is an alkyl group, an alkoxyalkyl group, an acyloxy group or a halogen atom, and n is an integer of 1 or 2.
  4. 4. The antireflection glass according to claim 1, wherein the intermediate refractive index layer is formed of a cured product of an intermediate refractive index layer composition containing (A) 1 to 15 parts by mass of an aluminum salt hydrate and (E) 40 to 130 parts by mass of metal oxide particles, relative to (B) 100 parts by mass of a binder component formed of an alkoxysilane compound represented by the following formula (1) or a hydrolysate thereof, R n -Si(OR 1 ) 4-n (1) Wherein R is an alkyl group, an alkenyl group or an alkoxyalkyl group, R 1 is an alkyl group, an alkoxyalkyl group, an acyloxy group or a halogen atom, and n is an integer of 1 or 2.
  5. 5. The antireflection glass according to claim 1, wherein the medium-low refractive index layer is formed of a cured product of a medium-low refractive index layer composition containing (A) 3 to 25 parts by mass of an aluminum salt hydrate, (C) 1 to 20 parts by mass of a metal chelate compound and (D) 25 to 90 parts by mass of silica particles, with respect to (B) 100 parts by mass of a binder component formed of an alkoxysilane compound represented by the following formula (1) or a hydrolysate thereof, R n -Si(OR 1 ) 4-n (1) Wherein R is an alkyl group, an alkenyl group or an alkoxyalkyl group, R 1 is an alkyl group, an alkoxyalkyl group, an acyloxy group or a halogen atom, and n is an integer of 1 or 2.
  6. 6. The anti-reflective glass of claim 1, wherein the glass substrate is an alkali aluminosilicate glass.
  7. 7. The antireflection glass according to claim 1, wherein the antireflection glass is an antireflection glass for alkali resistance chemical strengthening.
  8. 8. A method for producing an antireflection reinforced glass, comprising the step of subjecting the antireflection glass according to claim 1 to a chemical reinforcing treatment in a metal salt solution for ion exchange, and the step of alkali-washing the antireflection glass before or after the chemical reinforcing treatment step.

Description

Anti-reflection glass Technical Field The present invention relates to an antireflection glass to which high antireflection performance is imparted, which is suitable for use in the production of an antireflection reinforced glass. Background Strengthened glass having an improved strength is widely used for applications such as window glass of automobiles and houses, and recently is also used for applications such as full-face protection panels for capacitive touch panels, displays for various mobile devices such as digital cameras and cellular phones. The shape of the tempered glass for the latter use is small and complex, and shape processing such as cutting, end face processing, and hole forming is required. However, since these shape processing is difficult to perform after the strengthening, the glass substrate is processed into a final product shape in advance and then subjected to the strengthening treatment. As a method for strengthening glass, a physical strengthening method using quenching and a chemical strengthening method using ion exchange are known. The physical strengthening method is not effective for a thin glass substrate, which is a glass having a thickness of several mm or more. Therefore, a chemical strengthening method is generally used for thin-wall glass such as the protective panel and the display. The chemical strengthening method using ion exchange is performed by replacing metal ions (for example, sodium ions) having a small ionic radius contained in glass with metal ions (for example, potassium ions) having a larger ionic radius. That is, a compressive stress layer is formed on the surface of the glass by replacing a metal ion having a smaller ionic radius with a metal ion having a larger ionic radius. As a result, the glass needs to have a strength significantly improved from that of a normal glass by removing compressive stress on the surface in addition to the force for breaking the bonds between molecules. However, even when the tempered glass is tempered by a chemical treatment using ion exchange, other functions such as an antireflection function may be required, and particularly, a high antireflection function is required for the aforementioned protective panel, various displays, and the like. In order to provide an antireflection function, an antireflection film having a low refractive index may be formed on the glass surface. As a means for forming such an antireflection film, a method of vapor deposition and a method of using a sol-gel method are known. The vapor deposition method is a sol-gel method in which a coating liquid containing fine particles is applied and an antireflection film is formed by gelation by a heat treatment, and is mainly used because of low production cost and high production cost, because it requires a very high cost apparatus and is not industrially implemented. As an antireflection film formed by such a sol-gel method, for example, an antireflection film containing a hydrolytic condensate of a silicon compound, a metal chelate compound, and silica particles having a low refractive index is known (see patent document 1). The formation of an antireflection film on the surface of a tempered glass obtained by chemical treatment has a large problem to be solved. Conventionally, after forming an antireflection film, since potassium ions cannot penetrate into the glass and strengthening treatment cannot be performed, it has been necessary to form an antireflection film for each product subjected to shape processing and then strengthening treatment. In this case, the advantage of the sol-gel method that enables large-area processing is completely lost, and productivity is significantly reduced. In order to solve the above problems, a method of performing glass strengthening by chemical treatment after forming an antireflection film has been proposed. One of them is a method of glass strengthening by ion exchange using the interstitial spaces (hereinafter referred to as voids) between particles of inorganic fine particles contained in an antireflection film formed on a surface (patent document 2). However, this method has a problem that it is difficult to control the gap in which ion exchange can be performed. In order to solve the above-mentioned problems, there is proposed a method of ion exchange using hollow particles having a space therein, not using the voids between particles (patent document 3). In this method, since particles having a predetermined space volume are used, the ion exchange conditions can be set more easily than in the void method described above. However, on the other hand, hollow inorganic particles are not present in many cases or industrial production methods are limited, and thus the types of usable inorganic particles are limited. In order to improve the antireflection performance, a multilayer antireflection film has been developed in which a high refractive index layer and a medium refractive index layer are provided in