Glass substrate

Patent metadata

Field	Value
Publication number	US-12209052-B2
Application number	US-202017438290-A
Country	US
Kind code	B2
Filing date	Mar 6, 2020
Priority date	Mar 20, 2019
Publication date	Jan 28, 2025
Grant date	Jan 28, 2025

Abstract

A glass substrate of the present invention has a strain point of from 695° C. to 740° C., a temperature at 10 4.5 dPa·s of 1,300° C. or less, a liquidus viscosity of 10 4.5 dPa·s or more, a Young's modulus of 78 GPa or more, and a thermal shrinkage rate in heat treatment at 500° C. for 1 hour of 20 ppm or less.

First claim

The invention claimed is:

1. A glass substrate comprising as a glass composition, in terms of mol %, 10% to 15% of Al 2 O 3 , 0% to 0.1% of Li 2 O, 0% to 0.1% of Na 2 O, 0% to 1% of K 2 O, 0% to 8% of MgO, 0% to 10% of CaO, 0% to 10% of SrO, 0% to 3.51% of BaO, 0% to 10% of ZnO, 0% to 10% of P 2 O 5 , 0% to 1% of SnO 2 , 60% to −70% 68% of SiO 2 and 2% to 4.5% of B 2 O 3 , and having a strain point of from 713° C. to 740° C., a temperature at 104.5 dPa·s of 1,300° C. or less, a liquidus viscosity of 104.5 dPa·s or more, a Young's modulus of 78 GPa or more, and a thermal shrinkage rate in heat treatment at 500° C. for 1 hour of 20 ppm or less.

Assignees

• Nippon Electric Glass Co

Inventors

• Hayashi Masahiro
• NISHIMIYA Mayu

Classifications

• G02F1/1333

  Constructional arrangements; {Manufacturing methods}(G02F1/135, G02F1/136 take precedence) · CPC title

• C03C3/085

  containing an oxide of a divalent metal · CPC title

• C03C3/087

  containing calcium oxide, e.g. common sheet or container glass · CPC title

• C03C3/091

  containing aluminium · CPC title

• C03C3/093 Primary

  containing zinc or zirconium · CPC title