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AssigneeAsahi Glass Company, Limited
InventorsJunko MIYASAKA, Seiki Ohara, Shuji Yamazaki, Shusaku Akiba, Junichiro Kase
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An object of the present invention is to provide a glass for chemical strengthening which is capable of improving strength as compared with an ordinary soda lime silicate glass even when the same chemical strengthening treatment as that in a conventional process is applied and has good devitrification characteristics, a chemically strengthened glass using the glass for chemical strengthening, and a method for producing the chemically strengthened glass. The present invention provides a glass for chemical strengthening having a specific glass composition described in the present specification.
A glass for chemical strengthening, comprising, as expressed by mass percentage based on oxides, 60 to 72% of SiO2, 4.4 to 10% of Al2O3, 5 to 10.9% of MgO, 0.1 to 5% of CaO, 14 to 19% of Na2O, and 0 to 3% of K2O, wherein RO is 7% or more and 11% or less (wherein the RO represents the sum of alkaline earth metal oxides, i.e., MgO, CaO, SrO, and BaO) and RO/(RO+R2O) is 0.20 or more and 0.42 or less (wherein the R2O represents the sum of alkali metal oxides).
Dependencies are inferred from the claim text.