Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
December 15, 2015
Patent Application Number
12993058
Date Filed
May 28, 2009
Patent Citations Received
Patent Primary Examiner
Patent abstract
Disclosed is a glass flake (10) having improved heat resistance and improved chemical durability, which is composed of a glass base material satisfying, as expressed in mass %, 60≦SiO2≦70, 5≦Al2O3≦15, 1≦MgO≦10, 10≦CaO≦25 and 4<(Li2O+Na2O+K2O)<9. The temperature difference ΔT obtained by taking the devitrification temperature of the glass base material from the working temperature thereof is preferably within the range of 0-200° C. The glass transition temperature of the glass base material is preferably within the range of 560-750° C. It is desirable that the value of ΔW, which serves as an index for the acid resistance of the glass base material, is within the range of 0.05-1.2 mass %.
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