Asahi Glass Company, Limited

Asabi Glass Company, Limited

Yasumasa Nakao

Kei Maeda

Manabu Nishizawa

Tetsuya Nakashima

Jeetendra Sehgal

Junichiro Kase

Hideki Kushitani

Hideo Takahashi

Akio Koike

Seiki Ohara

Akira Takada

Hitoshi Onoda

Setsuro Ito

Seturo Ito

Yasuji Fukasawa

Chikao Tanaka

Jun-ichiro Kase

A glass for substrate, which consists, as represented by mass percentage, essentially of: wherein MgO+CaO+SrO+BaO is at least 15%.

Glass for substrate and glass substrate

A glass substrate for a display with a thickness of from 0.3 to 6 mm, which has an average W (filtered center line waviness: JIS B0651) of from 0.03 to 0.5 &mgr;m measured with a contact-type surface roughness measuring instrument using a phase compensation 2RC zone filter with a cutoff value of 0.8 to 25 mm over a measuring length of 200 mm.

Glass substrate for display and method of selecting it

An alkali-free glass consisting essentially of:

Alkali-free glass

A glass substrate for a display, which has a strain point of at least 550&deg; C., an average linear expansion coefficient of from 65&times;10 to 100&times;10 /&deg;C. within a range of from 50 to 350&deg; C. and a ratio K /d of at least 280 Pa&middot;kg&middot;m where K is the fracture toughness and d is the density.

Glass substrate for a display

Glass for a data storage medium substrate and glass substrate for data storage media

A glass for a substrate, having an average thermal expansion coefficient in the range of from 60&times;10,to 75&times;10,/&deg; C. at 50 to 350&deg; C., which consists essentially of the following composition expressed by wt %:

Glass for a substrate

A glass for a substrate consisting essentially of:

A plate glass containing B,O,, having a total content of Li,O, Na,O and K,O of from 0 to 13 mol %, a content of BaO of from 0 to 0.8 mol % and a content of SiO,of from 50 to 75 mol %, and having an average linear thermal expansion coefficient of from 75&times;10,to 120&times;10,/&deg; C. in a range of from 50 to 350&deg; C., a strain point of at least 550&deg; C., a density of at most 2.65 g/cm,at 20&deg; C. and an oxygen atom density of from 7.2&times;10,to 9.0&times;10,mol/cm,at 20&deg; C.

Plate glass and substrate glass for electronics

An alkali-free glass consisting essentially of, by wt %, from 58.4 to 66.0% of SiO,, from 15.3 to 22.0% of Al,O,, from 5.0 to 12.0% of B,O,, from 0 to 8.0% of MgO, from 0 to 9.0% of CaO, from 3.0 to 12.5% of SrO, from 0 to less than 2.0% of BaO, and from 9.0 to 18.0% of MgO&plus;CaO&plus;SrO&plus;BaO and having a strain point of at least 640&deg; C.

Alkali-free glass and flat panel display

A glass composition for a substrate consisting essentially of from 56 to 72 wt % of SiO.sub.2, from 1 to less than 14 wt % of Al.sub.2 O.sub.3, from 0 to 9 wt % of MgO, from 0.5 to 11 wt % of CaO, from 0 to 4 wt % of SrO, from 0 to 3 wt % of BaO, from 6 to less than 14 wt % of MgO+CaO+SrO+BaO, from 0 to 9 wt % of Na.sub.2 O, from 6 to 20 wt % of K.sub.2 O, and from 6 to 20 wt % of Na.sub.2 O+K.sub.2 O.

Glass composition for a substrate

An alkali-free glass consisting essentially of from 60 to 74 mol % of SiO.sub.2, from 10 to 16 mol % of Al.sub.2 O.sub.3, from 10 to 12 mol % of B.sub.2 O.sub.3, the molar ratio of Al.sub.2 O.sub.3 /B.sub.2 O.sub.3 being from 1.0 to 1.5, from 0 to 5 mol % of MgO, from 0 to 5 mol % of CaO, from 0 to 12 mol % of SrO, from 0 to 12 mol % of BaO, and from 6 to 12 mol % of SrO+BaO, which contains substantially no alkali metal oxide and has a strain point exceeding 650.degree. C. and an average thermal expansion coefficient of at most 40.times.10.sup.-7 /.degree.C. within a range of from 50.degree. to 300.degree. C., and of which the weight loss per unit area after immersion at 25.degree. C. for 20 minutes in a liquid prepared by mixing a 40 wt % ammonium fluoride aqueous solution and a 50 wt % hydrofluoric acid aqueous solution in a volume ratio of 9:1, is less than 0.60 mg/cm.sup.2, the weight loss per unit area after immersion at 95.degree. C. for 20 hours in 0.1N HCl, is less than 0.20 mg/cm.sup.2, and the liquidus temperature is at most a temperature at which the viscosity is 10.sup.4 poise.

Alkali-free glass and display substrate

A glass composition for a substrate consisting essentially of from 59 to 72 wt % of SiO.sub.2, from 1 to 15 wt % of Al.sub.2 O.sub.3, from 0.5 to 9 wt % of MgO, from 0.5 to 11 wt % of CaO, from 0 to 6 wt % of SrO, from 0 to 5 wt % of BaO, from 4 to 19 wt % of MgO+CaO+SrO+BaO, from 0 to 9 wt % of Na.sub.2 O , from 4 to 21 wt % of K.sub.2 O, from 10 to 22 wt % of Na.sub.2 O+K.sub.2 O, and from 0.5 to 10.5 wt % of ZrO.sub.2, wherein the difference between the SiO.sub.2 content and the Al.sub.2 O.sub.3 content is from 50 to 71 wt %, and the specific gravity of the composition is less than 2.6.

An alkali-free glass consisting essentially of from 60 to 73 mol % of SiO.sub.2, from 5 to 16 mol % of Al.sub.2 O.sub.3, from 5 to 12 mol % of B.sub.2 O.sub.3, from 0 to 6 mol % of MgO, from 0 to 9 mol % of CaO, from 1 to 9 mol % of SrO, from 0 to less than 1 mol % of BaO, and from 7 to 18 mol % of MgO+CaO+SrO+BaO and having a strain point of at least 640.degree. C.

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Yokohama, Japan

Yasumasa Nakao