Title:
ALKALI-FREE GLASS
Document Type and Number:
WIPO Patent Application WO/2023/037951
Kind Code:
A1
Abstract:
The present invention relates to alkali-free glass having a prescribed glass composition and having: a strain point of 700°C-740°C; a density of 2.6 g/cm３ or less; a Young's modulus of 90 GPa-100 GPa; an average coefficient of thermal expansion at 50-350°C of 30×10-7/K-39×10-７/K; a temperature T２ at which glass viscosity is 102 dPa・s of 1590°C- 1690°C; a temperature T4 at which glass viscosity is 104 dPa・s of 1350°C or less; a glass surface devitrification temperature (Tc) of less than T4＋80℃; and a specific modulus of 36 MN・m/kg or more.
Inventors:
HAMADA YUYA (JP)
TOKUNAGA HIROFUMI (JP)
TOKUNAGA HIROFUMI (JP)
Application Number:
PCT/JP2022/032891
Publication Date:
March 16, 2023
Filing Date:
August 31, 2022
Export Citation:
Assignee:
AGC INC (JP)
International Classes:
C03C3/093; C03C3/091; C03C3/118
Domestic Patent References:
| WO2013183625A1 | 2013-12-12 | |||
| WO2019082590A1 | 2019-05-02 |
Foreign References:
| JP2011105554A | 2011-06-02 | |||
| JP2019194156A | 2019-11-07 | |||
| CN111747645A | 2020-10-09 | |||
| CN111302619A | 2020-06-19 |
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (JP)
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