Title:
ALKALI-FREE GLASS
Document Type and Number:
WIPO Patent Application WO/2020/162605
Kind Code:
A1
Abstract:
The present invention relates to alkali-free glass comprising, in mol% in terms of oxides, 63-75% SiO2, 10-16% Al2O3, 0-5% B2O3, 0.1-15% MgO, 0.1-12% CaO, 0-8% SrO, and 0-6% BaO, wherein the ratio [MgO]/[CaO] is 1.5 or less, formula (A) returns a value of 82.5 or greater, formula (B) returns a value of 690-800, inclusive, formula (C) returns a value of 100 or less, formula (D) returns a value of 20 or less, the Young's modulus is 83 GPa or greater, and the surface devitrification viscosity ηc is 104.2 d Pa·s or greater.
Inventors:
TOKUNAGA HIROFUMI (JP)
ONO KAZUTAKA (JP)
ONO KAZUTAKA (JP)
Application Number:
PCT/JP2020/004848
Publication Date:
August 13, 2020
Filing Date:
February 07, 2020
Export Citation:
Assignee:
AGC INC (JP)
International Classes:
C03C3/091; C03B5/225; C03B17/06; C03B18/02; C03C3/087; C03C3/093; C03C3/097; C03C3/112; G02F1/1333; G03F1/60; G11B5/73; H01Q1/38
Domestic Patent References:
| WO2013183569A1 | 2013-12-12 | |||
| WO2013180220A1 | 2013-12-05 | |||
| WO2013172307A1 | 2013-11-21 |
Foreign References:
| JP2016029001A | 2016-03-03 |
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (JP)
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