Nippon Sheet Glass Company, Limited

Hoya Corporation

Avanstrate Inc.

Olympus Corporation

Unitika Ltd.

Unitika Glass Fiber Co., Ltd.

Junji Kurachi

Akihiro Koyama

Nobuyuki Yamamoto

Yasuhiro Saito

Kazuishi Mitani

Shoichi Kishimoto

Yoshihiro Matsuno

Koichi Ataka

Yoichi Hachitani

Aya Nakamura

Yutaka Senshu

Keiji Tsunetomo

Shinya Okamoto

Yasushi Nakamura

Hiroaki Kasai

Hirotaka Koyo

Hiroyuki Inomata

Takeshi Hidaka

Masamichi Hijino

Takaharu Miyazaki

Hidetoshi Fukuchi

Riku Sawai

Yoshito Nawa

Kohji Hattori

Koji Fujita

Hiroshi Ikeda

Takeo Watanabe

Haruki Niida

Teruhide Inoue

Kensuke Matsuno

Akira Kitayama

The present disclosure provides a glass composition for chemical strengthening, the glass composition having a high alkali resistance and being suitable for achieving both the surface compressive stress and the compressive stress layer depth. The glass composition according to the present disclosure includes, as components, in mol %: 60 to 80% SiO; 1 to 5% AlO; 5 to 25% MgO; 0 to 5% CaO; 10 to 20% NaO; and 0 to 10% KO. A chemically strengthened glass article, for example, having a surface compressive stress of 650 to 950 MPa and a compressive stress layer depth of 7 to 17 μm can be provided using the glass composition.

Glass composition for chemical strengthening and chemically strengthened glass article

The present disclosure provides a novel glass composition that has a low permittivity and is suitable for mass production. A glass composition provided satisfies, in wt %, for example, 40&#x2264;SiO&#x2264;60, 25&#x2264;BO&#x2264;45, 0&#x3c;AlO&#x2264;18, 0&#x3c;RO&#x2264;5, and 0&#x2264;RO&#x2264;12, and satisfies at least one of: i) SiO+BO&#x2265;80 and SiO+BO+AlO&#x2264;99.9; and ii) SiO+BO&#x2265;78, SiO+BO+AlO&#x2264;99.9, and 0&#x3c;RO&#x3c;10. Another glass composition provided includes SiO, BO, AlO, RO, and 3&#x3c;RO&#x3c;8 at the same contents as the above, and satisfies SiO+BO&#x2265;75 and SiO+BO+AlO&#x3c;97, where RO=LiO+NaO+KO and RO=MgO+CaO+SrO.

Glass composition, glass fiber, glass cloth, and method for producing glass fiber

The present disclosure provides a novel glass composition that has a low permittivity and is suitable for mass production. A glass composition provided satisfies, in wt %, for example, 40&#x2264;SiO&#x2264;60, 25&#x2264;BO&#x2264;45, 0&#x3c;AlO&#x2264;18, 0&#x3c;RO&#x2264;5, and 0&#x2264;RO&#x2264;12, and satisfies at least one of: i) SiO+BO&#x2265;80 and SiO+BO+AlO&#x2264;99.9; and ii) SiO+BO&#x2265;78, SiO+BO+AlO&#x2264;99.9, and 0&#x3c;RO&#x3c;10. Another glass composition provided includes SiO, BO, AlO, RO, and 3&#x3c;RO&#x3c;8 at the same contents as the above, and satisfies SiO+BO&#x2265;75 and SiO+BO+AlO&#x3c;97, where RO&#x2550;LiO+NaO+KO and RO&#x2550;MgO+CaO+SrO.

The present invention provides a glass composition that allows holes with a circular contour and a smooth inner wall to be formed by a collective micro-hole-forming process using a combination of modified portion formation by ultraviolet laser irradiation and etching, the glass composition being adapted for practical continuous production. The present invention relates to a glass for laser processing, the glass including a metal oxide serving as a coloring component, the glass having a glass composition including, in mol %: 45.0%&#x2264;SiO&#x2264;68.0%; 2.0%&#x2264;BO&#x2264;20.0%; 3.0%&#x2264;AlO&#x2264;20.0%; 0.1%&#x2264;TiO&#x2264;5.0%; and 0%&#x2264;ZnO&#x2264;9.0%, wherein a relationship of 0&#x2264;LiO+NaO+KO&#x3c;2.0% is satisfied.

Glass for laser processing and method for producing perforated glass using same

Provided is a glass composition containing, in mol %: 56 to 66% SiO; 6 to 12% AlO; 5 to 14% MgO; 0 to 1% CaO; 17 to 24% NaO; and 0 to 3% KO. The total content of LiO, NaO, and KO is in a range of 18.5 to 24%. This glass composition is suitable for production by a float process and for introduction of a compressive stress layer with a high crack initiation load, a high surface compressive stress, and a large thickness by chemical strengthening.

Glass composition, glass composition for chemical strengthening, strengthened glass article, and cover glass for display

A glass composition of the present invention includes, in mol %, 66 to 72% SiO, 1 to 4% AlO, 8 to 15% MgO, 1 to 8% CaO, 12 to 16% NaO, and 0 to 1% KO. A total content of MgO and CaO is in a range of 12 to 17%, and a molar ratio of CaO to the total content of MgO and CaO is in a range of 0.1 to 0.4. The glass composition of the present invention is suitable for production by the float process, and is suitable for chemical strengthening.

The present invention provides a glass composition containing, in mass %: 59.0 to 63.0% SiO; 4.0 to 10.0% TiO; 8.0 to 12.0% AlO; 1.0 to 5.0% MgO; 0 to 4.0% CaO; 4.0 to 14.0% SrO; 4.0 to 11.0% NaO; and 0 to 1.0% KO. According to the present invention, it is possible to provide a glass composition having excellent heat resistance, being suitable for production by the float process, and being suitable for chemical strengthening.

Glass composition, chemically strengthened glass, and glass substrate for information recording medium

Provided is a glass composition containing, in mass %: 58 to 64% SiO; 8 to 12% AlO; 6 to 10% MgO; 0 to 1% CaO; 18 to 24% NaO; 0 to 3% KO; 0 to 2% TiO; and 0 to 3% ZrO. The total content of MgO, CaO, SrO, and BaO is in a range of 7 to 12%. This glass composition is suitable for production by a float process and for chemical strengthening.

A glass substrate for a display, which is formed of a glass having a light weight and having high refinability with decreasing environmental burdens, the glass comprising, by mass %, 50 to 70% of SiO, 5 to 18% of BO, 10 to 25% of AlO, 0 to 10% of MgO, 0 to 20% of CaO, 0 to 20% of SrO, 0 to 10% of BaO, 5 to 20% of RO (in which R is at least one member selected from the group consisting of Mg, Ca, Sr and Ba), and over 0.20% but not more than 2.0% of R'O (in which R&#x2032; is at least one member selected from the group consisting of Li, Na and K), and containing, by mass %, 0.05 to 1.5% of oxide of metal that changes in valence number in a molten glass, and substantially containing none of AsO, SbOand PbO.

Glass substrate for display and display

An ultraviolet ray transmitting glass composition including the following components, in terms of mass % or mass ppm: 60 to 79% SiO; 0 to 1% BO; exceeded 0% but not more than 20% AlO; 0 to 10% LiO; 5 to 20% NaO; 0 to 15% KO; 0 to 10% MgO; 0 to 10% CaO; 0 to 15% SrO; 0 to 2% refining agent; 2 to 20 ppm T-FeO(in which T-FeOdenotes a total iron oxide content obtained by converting all of iron compounds into FeO); and 0 to 200 ppm TiO. The ultraviolet ray transmitting glass composition is suitable for a glass article, such as a bioanalytical device that is used for analysis using ultraviolet rays.

Ultraviolet ray transmitting glass composition and glass article making use of the same

The glass composition of the present invention includes the following components, expressed in mass %: 70% to 88% of SiO; 6% to 18% of BO; 0.5% to 4.5% of AlO; 0% to 0.5% of LiO; 0% to 0.5% of NaO; 2% to 10% of KO; and 0% to 2% of MgO+CaO+SrO+BaO, and the glass composition further includes chlorine (Cl). The glass composition of the present invention is used suitably as a glass substrate for an information display device.

Glass composition and method for production thereof, and glass substrate for information display device and information display device using the same

A glass substrate of the present invention for magnetic recording media having high heat resistance and easy chemical strengthening ability at once has not been obtained, which is a glass composition essentially comprising 60 to 70 wt % SiO, 5 to 20 wt % AlO, 0 to 1 wt % LiO, 3 to 18 wt % NaO, 0 to 9 wt % KO, 0 to 10 wt % MgO, 1 to 15 wt % CaO, 0 to 4.5 wt % SrO, 0 to 1 wt % BaO, 0 to 1 wt % TiOand 0 to 1 wt % ZrO, wherein the sum of LiO, NaO and KO is from 5 to 25 wt %, and the sum of MgO, CaO, SrO and BaO is from 5 to 20 wt %.

Glass composition, glass article, glass substrate for magnetic recording media, and method for producing the same

There are provided a method of processing an amorphous material which is capable of forming surface projections of uniform height in desired positions on the amorphous material, and a magnetic disk substrate using the amorphous material. A predetermined pressure is applied to selected parts of a surface of an amorphous material using fine particles having a hardness higher than that of the amorphous material to form high-density compressed layers, and a surface layer of the amorphous material is removed using a treatment agent that has a different removal capacity in the compressed layers and a remaining uncompressed layer, thus making the compressed layers project out. For example, the treatment agent may be an etching solution having a different etching rate in the compressed layers and the uncompressed layer.

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Tokyo, Japan

Junji Kurachi