Agc Inc.

Asahi Glass Company, Limited

Kiyoshi Tamai

Izuru Kashima

Yusuke Fujiwara

Daisuke Kobayashi

Yuichi Suzuki

Yoichi Sera

Taku Yamada

Kazutaka Ono

Yusuke Kobayashi

Seiji Inaba

Makoto Sano

Hirofumi Yamamoto

Nobutaka Aomine

Kazunobu Maeshige

Yuha Kobayashi

Hiroyuki Okawa

Hitoshi Onoda

Noriko Tanabe

Yasunari Saito

Naoki Uemura

A supporting glass substrate includes a compression stress layer on a surface thereof, and has an average thermal expansion coefficient at 50° C. to 200° C. that is 7 ppm/° C. to 15 ppm/° C., an internal tensile stress that is 5 MPa to 55 MPa, and a depth of the compression stress layer that is 10 μm to 60 μm.

Supporting glass substrate and laminated body

The present invention provides a cover glass and a glass laminate which are reduced in warpage, and have excellent scratch resistance, low reflecting properties and excellent optical properties. According to the present invention, a cover glass and a glass laminate which are reduced in glass warpage, retain the effect of scratch resistance, and have low reflecting properties and excellent optical properties can be provided by alternately superposing a film including a high-refractive-index material and a film including a low-refractive-index material, in given amounts.

Cover glass and glass laminate

A supporting glass substrate has a ratio of a Young's modulus (GPa) to a density (g/cm) that is 37.0 (GPa&#xb7;cm/g) or more and the ratio has a value larger than a ratio calculation value, the ratio calculation value being a ratio of a Young's modulus (GPa) calculated from a composition to a density (g/cm). The ratio calculation value is represented by the following expression: &#x3b1;=2&#xb7;&#x3a3;{(V&#xb7;G)/M&#xb7;X}, where, in the expression, Vis a filling parameter of a metal oxide contained in the supporting glass substrate, Gis a dissociation energy of a metal oxide contained in the supporting glass substrate, Mis a molecular weight of a metal oxide contained in the supporting glass substrate, and Xis a molar ratio of a metal oxide contained in the supporting glass substrate.

Supporting glass substrate

An object of the present invention is to provide a chemically strengthened glass that can effectively suppress strength of a glass from being deteriorated even though performing chemical strengthening and has high transmittance (that is, low reflectivity). The present invention relates to a chemically strengthened glass having a compressive stress layer formed on a surface layer thereof by an ion exchange method, in which the glass contains sodium and boron, and has a delta transmittance being +0.1% or more, and in which a straight line obtained by a linear approximation of a hydrogen concentration Y in a region of a depth X from an outermost surface of the glass satisfies a specific relational equation in X=0.1 to 0.4 (&#x3bc;m).

Chemically strengthened glass and production method for chemically strengthened glass

An object of the present invention is to provide a chemically strengthened glass having enhanced surface strength and bending strength. The present invention relates to a chemically strengthened glass having a compressive stress layer formed on a surface layer thereof by an ion exchange method, in which a straight line obtained by a linear approximation of a hydrogen concentration Y in a region of a depth X from an outermost surface of the glass satisfies a specific relational equation (I) in X=0.1 to 0.4 (&#x3bc;m), and an edge surface connecting main surfaces on a front side and a back side of the glass has a skewness (Rsk) measured based on JIS B0601 (2001) being &#x2212;1.3 or more.

Chemically strengthened glass and production method for same

A chemically strengthened glass having a compressive stress layer formed in a surface layer thereof according to an ion exchange method, in which the glass has a surface roughness (Ra) of 0.20 nm or higher, a hydrogen concentration Y in a region to a depth X from an outermost surface of the glass satisfies the following relational equation (I) at X=from 0.1 to 0.4 (&#x3bc;m), a surface strength F (N) measured by a ball-on-ring test under the following conditions is (F&#x2265;1500&#xd7;t) relative to a sheet thickness t (mm) of the glass, and a surface of the glass has no polishing flaw:&#x2003;&#x2003;(I)in which meanings of respective symbols in the equation (I) are as follows: Y: hydrogen concentration (as HO, mol/L); X: depth from the outermost surface of the glass (&#x3bc;m); a: &#x2212;0.270 to &#x2212;0.005; and b: 0.020 to 0.220.

Chemically strengthened glass

A chemically strengthened glass having a compressive stress layer formed in a surface layer thereof according to an ion exchange method, in which a surface of the glass has polishing flaws, the glass has a texture direction index (Stdi) of 0.30 or more, a hydrogen concentration Y in a region to a depth X from an outermost surface of the glass satisfies the following relational equation (I) at X=from 0.1 to 0.4 (&#x3bc;m), and a surface strength F (N) measured by a ball-on-ring test is (F&#x2265;1400&#xd7;t) relative to a sheet thickness t (mm) of the glass:&#x2003;&#x2003;(I)in which meanings of respective symbols in the equation (I) are as follows: Y: hydrogen concentration (as HO, mol/L), X: depth from the outermost surface of the glass (&#x3bc;m), a: &#x2212;0.300 or more, and b: 0.220 or less.

Chemically strengthened glass and method for producing same

A chemically strengthened glass having a compressive stress layer formed in a surface layer thereof according to an ion exchange method, in which the glass has a surface roughness (Ra) of 0.20 nm or higher, a hydrogen concentration Y in a region to a depth X from an outermost surface of the glass satisfies the following relational equation (I) at X=from 0.1 to 0.4 (&#x3bc;m), a surface strength F (N) measured by a ball-on-ring test under the following conditions is (F&#x2267;1500&#xd7;t) relative to a sheet thickness t (mm) of the glass, and a surface of the glass has no polishing flaw:&#x2003;&#x2003;(I)in which meanings of respective symbols in the equation (I) are as follows: Y: hydrogen concentration (as HO, mol/L); X: depth from the outermost surface of the glass (&#x3bc;m); a: &#x2212;0.270 to &#x2212;0.005; and b: 0.020 to 0.220.

A method for producing a chemically strengthened glass, including a step of bringing a glass containing sodium into contact with an inorganic salt containing potassium nitrate, thereby performing ion exchange of a Na ion in the glass with a K ion in the inorganic salt, in which the inorganic salt contains at least one salt selected from the group consisting of KCO, NaCO, KHCO, NaHCO, KPO, NaPO, KSO, NaSO, KOH and NaOH, and the method includes: a step of washing the glass after the ion exchange; a step of subjecting the glass to an acid treatment after the washing; and a step of subjecting the glass to an alkali treatment after the acid treatment.

Growing community of inventors

Tokyo, Japan

Kiyoshi Tamai