Glass for chemical strengthening, chemically strengthened glass, and electronic device case
AssigneeAGC Inc.
InventorsQing LI, Akio KOIKE, Eriko MAEDA
Life of this patent
Estimating the term…
Abstract
The present invention pertains to a glass for strengthening, that: has an average transmittance of at least 70% when converted to a thickness of 0.8 mm at a wavelength of 380-780 nm; has a haze value of no more than 0.7% when converted to a thickness of 0.8 mm in a C light source; has a Young's modulus of at least 85 GPa; has a fracture toughness value of at least 0.90 MPa·m1/2; a thermal conductivity at 20° C. of at least 1.3 W/m·K; and comprises a lithium aluminosilicate crystallized glass.
Claims11
1-4. (canceled)
A chemically strengthened glass, comprising a lithium aluminosilicate crystallized glass, and comprising, as expressed by mass % on an oxide basis:
- 4 to 15% of Li2O;
- 0.2 to 4% of Na2O;
- 0 to 2% of K2O;
- 0 to 4% of SnO2;
- 1 to 8% of ZrO2;
- 1 to 4% of P2O5;
- 0 to 1% of BaO;
- and
- 0 to 2% of ZnO,
- a total of SnO2 and ZrO2 being 3 to 8%,
- wherein the glass is free of As2O3 and Sb2O3, and
- the glass has:
- an average transmittance at a wavelength of 380 to 780 nm of 70% or higher in terms of a thickness of 0.8 mm;
- a haze value of 0.7% or lower in terms of the thickness of 0.8 mm at a C illuminant;
- a Young's modulus of 85 GPa or more;
- a fracture toughness value of 0.90 MPa·m1/2 or more;
- and
- a thermal conductivity at 20° C. of 1.3 W/m·K or more.
Dependencies are inferred from the claim text.