Title:
NON-ALKALI GLASS SUBSTRATE
Document Type and Number:
Japanese Patent JP2020152602
Kind Code:
A
Abstract:
To provide a non-alkali glass substrate in which, under a reduced pressure atmosphere, bubbles contained in molten glass can easily be removed.SOLUTION: A non-alkali glass substrate, containing, in oxide-based mass% expression, SiO2: 54 to 66%, Al2O3: 10 to 23%, B2O3: 6 to 12%, MgO + CaO + SrO + BaO: 8 to 26%, and in which, characterized, β-OH is 0.15 to 0.5 mm-1, contained amount of Cl is 0.1 to 0.35 mass%, and bubble growth index I expressed by the following formula (1) is 280 or more. I=590.5×[β-OH] + 874.1×[Cl] - 5.7×[B2O3] - 33.3 (1). Here, in equation (1), [β-OH] indicates β-OH (mm-1) of the non-alkali glass substrate, [Cl] indicates the contained amount of Cl (mass%) in the non-alkali glass substrate, and [B2O3] indicates the contained amount of B2O3 (mass%) in the non-alkali glass substrate.SELECTED DRAWING: None
Inventors:
HIROSE MOTOYUKI
ENOMOTO TAKASHI
ENOMOTO TAKASHI
Application Number:
JP2019051534A
Publication Date:
September 24, 2020
Filing Date:
March 19, 2019
Export Citation:
Assignee:
AGC INC
International Classes:
C03C3/091; C03B5/225
Domestic Patent References:
| JP2005306719A | 2005-11-04 | |||
| JP2005097090A | 2005-04-14 | |||
| JP2007039324A | 2007-02-15 | |||
| JP2016084242A | 2016-05-19 |
Foreign References:
| WO2011078258A1 | 2011-06-30 | |||
| WO2007004683A1 | 2007-01-11 | |||
| WO2014129424A1 | 2014-08-28 |
Attorney, Agent or Firm:
Hideaki Ito
Takemoto Yoichi
Hirohisa Hachiya
Takemoto Yoichi
Hirohisa Hachiya