Agc Inc.

Shingo Urata

Takashi Enomoto

Kazuhiro Suzuki

Yusuke Arai

Kenji Imakita

Kensuke Nagai

Takumi Umada

The present invention relates to a glass including, in mole percentage in terms of oxides: 40-65% of SiO; 25-40% of AlO; and 7-15% of one or more components, in total, selected from YO, LaO, NbO, TaO, and WO. Also the present invention relates to a chemically strengthened glass having a base composition including, in mole percentage in terms of oxides: 40-65% of SiO; 25-40% of AlO; 7-15% of YO; and 2-15% of LiO, and having a compressive stress value, measured at a depth of 50 μm from a surface thereof, of 150 MPa or more.

Glass, chemically tempered glass, and method for producing same

There is provided a process for producing molten glass, which is capable of easily increasing the HO content in glass melt with excessive generation of convection of the glass melt being reduced. One mode of the process for producing molten glass according to the present invention is characterized to include a material melting step for melting a raw glass material in a melting furnace to prepare glass melt; a water-molecules supply step for supplying a water-molecules supply gas into the glass melt flowing from an upstream end of the melting furnace toward a downstream end of the melting furnace; and a refining step for degassing, under a reduced pressure atmosphere, the glass melt flowing out of the downstream end; wherein a position where the water-molecules supply gas is supplied in the water-molecules supply step includes a first position and a second position from downstream to upstream in a flowing direction of the glass melt in this order; the first position is a position away from both of the upstream end and the downstream end; and the second position is a position closer to the upstream end than a center of a distance between the upstream end and the first position in the flowing direction of the glass melt.

Method for manufacturing molten glass, method for manufacturing glass product, and device for manufacturing molten glass

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Chiyoda-ku, Japan

Shingo Urata