Chemically strengthened glass

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United States of America Patent

PATENT NO 10450226
APP PUB NO 20180072619A1
SERIAL NO

15818016

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A chemically strengthened glass having a compressive stress layer formed in a surface layer thereof according to an ion exchange method, in which the glass has a surface roughness (Ra) of 0.20 nm or higher, a hydrogen concentration Y in a region to a depth X from an outermost surface of the glass satisfies the following relational equation (I) at X=from 0.1 to 0.4 (μm), a surface strength F (N) measured by a ball-on-ring test under the following conditions is (F≥1500×t2) relative to a sheet thickness t (mm) of the glass, and a surface of the glass has no polishing flaw:

description='In-line Formulae' end='lead'Y=aX+b  (I)description='In-line Formulae' end='tail'

in which meanings of respective symbols in the equation (I) are as follows: Y: hydrogen concentration (as H2O, mol/L); X: depth from the outermost surface of the glass (μm); a: −0.270 to −0.005; and b: 0.020 to 0.220.

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Patent Owner(s)

  • AGC INC.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fujiwara, Yusuke Tokyo, JP 101 873
Kashima, Izuru Tokyo, JP 26 93
Kobayashi, Daisuke Tokyo, JP 309 1376
Sera, Yoichi Tokyo, JP 12 75
Suzuki, Yuichi Tokyo, JP 173 1953
Tamai, Kiyoshi Tokyo, JP 17 87
Yamada, Taku Tokyo, JP 47 327

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