Glass

Patent metadata

Field	Value
Publication number	US-2018148367-A1
Application number	US-201615576983-A
Country	US
Kind code	A1
Filing date	May 24, 2016
Priority date	Jun 2, 2015
Publication date	May 31, 2018
Grant date	—

Abstract

A glass of the present invention includes as a glass composition, in terms of mass %, 50% to 65% of SiO 2 , 15% to 26% of Al 2 O 3 , 0% to 5% of B 2 O 3 , 0% to 5% of MgO, 0% to 10% of CaO, 0% to 10% of SrO, 0% to 15% of BaO, and 0.01% to 15% of P 2 O 5 , has a molar ratio (MgO+CaO+SrO+BaO)/Al 2 O 3 of from 0.5 to 1.5, and satisfies a relationship of {[B 2 O 3 ]+3×[P 2 O 5 ]}≤18.5 mol %.

First claim

1 . A glass, which comprises as a glass composition, in terms of mass %, 50% to 65% of SiO 2 , 15% to 26% of Al 2 O 3 , 0% to 5% of B 2 O 3 , 0% to 5% of MgO, 0% to 10% of CaO, 0% to 10% of SrO, 0% to 15% of BaO, and 0.01% to 15% of P 2 O 5 , has a molar ratio (MgO+CaO+SrO+BaO)/Al 2 O 3 of from 0.5 to 1.5, and satisfies a relationship of {[B 2 O 3 ]+3×[P 2 O 5 ]}≤18.5 mol %.

2 . The glass according to claim 1 , wherein the glass has a mass ratio (SiO 2 +B 2 O 3 )/Al 2 O 3 of from 2 to 4.

3 . The glass according to claim 1 , wherein the glass has a mass ratio B 2 O 3 /P 2 O 5 of 2 or less.

4 . The glass according to claim 1 , wherein the glass satisfies a relationship of 4 mol %≤{[B 2 O 3 ]+3×[P 2 O 5 ]}≤16.5 mol % and a relationship of 110 mol %≤{2×[SiO 2 ]—[MgO]—[CaO]—[SrO]—[BaO]}≤130 mol %.

5 . The glass according to claim 1 , wherein the glass has a content of Li 2 O+Na 2 O+K 2 O of 0.5 mass % or less in the glass composition.

6 . The glass according to claim 1 , wherein the glass has a content of B 2 O 3 of 3.0 mass % or less in the glass composition.

7 . The glass according to claim 1 , wherein the glass has a property of allowing precipitation of two or more kinds of crystals among a SiO 2 —Al 2 O 3 —RO-based crystal, a SiO 2 -based crystal, and a SiO 2 —Al 2 O 3 -based crystal when being retained in a temperature range of from a liquidus temperature to (liquidus temperature-50° C.) for 24 hours.

8 . The glass according to claim 1 , wherein the glass has a strain point of 710° C. or more.

9 . The glass according to claim 1 , wherein the glass has an etching depth of 25 μm or more when immersed in a 10 mass % HF aqueous solution at 20° C. for 30 minutes.

10 . The glass according to claim 1 , wherein the glass has a specific Young's modulus of 28 GPa/(g/cm 3 ) or more.

11 . The glass according to claim 1 , wherein the glass is used for a substrate for a liquid crystal display.

12 . The glass according to claim 1 , wherein the glass is used for a substrate for an OLED display.

13 . The glass according to claim 1 , wherein the glass is used for a substrate for a high-definition display driven by a polysilicon or oxide TFT.

14 . A glass, which comprises as a glass composition at least SiO 2 , Al 2 O 3 , B 2 O 3 , P 2 O 5 , and RO (alkaline earth metal oxide), satisfies a relationship of {[B 2 O 3 ]+3×[P 2 O 5 ]}≤18.5 mol %, and has a property of allowing precipitation of two or more kinds of crystals among a SiO 2 —Al 2 O 3 —RO-based crystal, a SiO 2 -based crystal, and a SiO 2 —Al 2 O 3 -based crystal when being retained in a temperature range of from a liquidus temperature to (liquidus temperature-50° C.) for 24 hours.

Assignees

• Nippon Electric Glass Co

Inventors

• Hayashi Masahiro

Classifications

• G02F1/1333

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

• C03C3/091

  containing aluminium · CPC title

• C03C15/00

  Surface treatment of glass, not in the form of fibres or filaments, by etching (etching or surface-brightening compositions, in general C09K13/00) · CPC title

• C03C3/087 Primary

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

• C03C3/097 Primary

  containing phosphorus, niobium or tantalum · CPC title