Alkali-free glass panel

Patent metadata

Field	Value
Publication number	US-2023212060-A1
Application number	US-202117920962-A
Country	US
Kind code	A1
Filing date	Jun 21, 2021
Priority date	Jun 23, 2020
Publication date	Jul 6, 2023
Grant date	—

Abstract

The present invention provides an alkali-free glass sheet, including as a glass composition, in terms of mol%, 64% to 71% of SiO2, 12.5% to 17% of Al2O3, 0% to 4% of B2O3, 0% to 0.5% of Li2O+Na2O+K2O, 6% to 11% of MgO, 3% to 11% of CaO, 0% to 6% of SrO, 0% to 1% of BaO, and 14% to 19% of MgO+CaO+SrO+BaO, and having a mole percent ratio (Al2O3/CaO)×{B2O3/(MgO+CaO+SrO+BaO)} of from 0 to 0.5, a mole percent ratio MgO/(CaO+SrO) of from 0.5 to 1.5, a mole percent ratio (MgO+CaO+SrO+BaO-Al2O3)×B2O3 of from 1 to 10, and a mole percent ratio SiO2×CaO/MgO of from 30 to 90.

First claim

1 . An alkali-free glass sheet, comprising as a glass composition, in terms of mol%, 64% to 71% of SiO 2 , 12.5% to 17% of Al 2 O 3 , 0% to 4% of B 2 O 3 , 0% to 0.5% of Li 2 O+Na 2 O+K 2 O, 6% to 11% of MgO, 3% to 11% of CaO, 0% to 6% of SrO, 0% to 1% of BaO, and 14% to 19% of MgO+CaO+SrO+BaO, and having a mole percent ratio (Al 2 O 3 /CaO)×{B 2 O 3 /(MgO+C a O+SrO+BaO)} of from 0 to 0.5, a mole percent ratio MgO/(CaO+SrO) of from 0.5 to 1.5, a mole percent ratio (MgO+CaO+SrO+BaO- Al 2 O 3 )×B 2 O 3 of from 1 to 10, and a mole percent ratio SiO 2 ×CaO/MgO of from 30 to 90.

2 . The alkali-free glass sheet according to claim 1 , wherein the alkali-free glass sheet has a Young’s modulus of 80 GPa or more, a strain point of 700° C. or more, and a liquidus temperature of 1,350° C. or less.

3 . The alkali-free glass sheet according to claim 1 wherein the alkali-free glass sheet is further substantially free of As 2 O 3 and Sb 2 O 3 .

4 . The alkali-free glass sheet according to claim 1 , wherein the alkali-free glass sheet further comprises 0.001 mol% to 1 mol% of SnO 2 .

5 . The alkali-free glass sheet according to claim 1 , wherein the alkali-free glass sheet has a strain point of 710° C. or more.

6 . The alkali-free glass sheet according to claim 1 , wherein the alkali-free glass sheet has a Young’s modulus of more than 81 GPa.

7 . The alkali-free glass sheet according to claim 1 , wherein the alkali-free glass sheet has an average thermal expansion coefficient within a temperature range of from 30° C. to 380° C. of from 30×10 -7 /°C to 50×10 -7 /°C.

8 . The alkali-free glass sheet according to claim 1 , wherein the alkali-free glass sheet has a liquidus viscosity of 10 4.0 dPa·s or more.

9 . The alkali-free glass sheet according to claim 1 , wherein the alkali-free glass sheet is used for an OLED device.

10 . An alkali-free glass sheet, which has a content of Li 2 O+Na 2 O+K 2 O of from 0 mol% to 0.5 mol% in a glass composition, and has a Young’s modulus of 80 GPa or more, a strain point of 700° C. or more, and a liquidus temperature of 1,350° C. or less.

Assignees

• Nippon Electric Glass Co

Inventors

• NISHIMIYA Mayu

Classifications

• H10K59/10

  OLED displays · CPC title

• H10K59/80

  Constructional details · CPC title

• H10K50/844

  Encapsulations · CPC title

• H05B33/02

  Details · CPC title

• C03C3/091 Primary

  containing aluminium · CPC title