Crystallized glass and chemically strengthened glass

Patent metadata

Field	Value
Publication number	US-11274058-B2
Application number	US-202016747586-A
Country	US
Kind code	B2
Filing date	Jan 21, 2020
Priority date	Jul 26, 2017
Publication date	Mar 15, 2022
Grant date	Mar 15, 2022

Abstract

A crystallized glass that: has a visible light transmittance of at least 85% when the thickness thereof is converted to 0.8 mm; has a haze value of no more than 1.0% when the thickness thereof is converted to 0.8 mm; contains, in terms of mass % on an oxide basis, 58%-70% SiO2, 15%-30% Al2O3, 2%-10% Li2O, 0%-5% Na2O, 0%-2% K2O, 0%-1.8% SrO, 0%-2% BaO, 0.5%-6% SnO2, 0.5%-6% ZrO2, and 0%-6% P2O5; has a total SrO and BaO content of 0.1%-3%; and has a total Na2O and K2O content of 1%-5%.

First claim

The invention claimed is:

1. A crystallized glass, comprising, as expressed by mass % on an oxide basis:
58 to 70% of SiO 2 ;
15 to 30% of Al 2 O 3 ;
2 to 10% of Li 2 O;
0 to 5% of Na 2 O,
0 to 2% of K 2 O;
0.5% to 1.8% of SrO;
0 to 1.5% of BaO;
0.5 to 6% of SnO 2 ;
0.5 to 6% of ZrO 2 ; and
0 to 6% of P 2 O 5 ,
wherein a total content of SrO and BaO is 0.5 to 2.0%, and a total content of Na 2 O and K 2 O is 1 to 5%, and
wherein
the crystallized glass comprises β-spodumene crystals, wherein an average particle size of the β-spodumene crystals is 300 nm or less,
a visible light transmittance of the crystallized glass having a thickness of 0.8 mm is 85% or higher, and
a haze value of the crystallized glass having a thickness of 0.8 mm is 1% or lower.

2. The crystallized glass according to claim 1 , wherein the haze value of the crystallized glass having a thickness of 0.8 mm is 0.6% or lower.

Assignees

• Agc Inc

Inventors

• Li Qing
• Koike Akio
• KANEHARA Kazuki

Classifications

• C03C10/0054 Primary

  containing PbO, SnO2, B2O3 · CPC title

• C03C3/083

  containing aluminium oxide or an iron compound · CPC title

• C03B32/02

  Thermal crystallisation, e.g. for crystallising glass bodies into glass-ceramic articles {(C03B27/012 takes precedence)} · CPC title

• C03C10/0027 Primary

  containing SiO2, Al2O3, Li2O as main constituents · CPC title

• C03B27/012

  by heat treatment, e.g. for crystallisation; Heat treatment of glass products before tempering by cooling (C03B27/008, C03B27/016 take precedence) · CPC title