The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 15, 2015
Filed:
May. 28, 2009
Kosuke Fujiwara, Tokyo, JP;
Akihiro Koyama, Tokyo, JP;
Kosuke Fujiwara, Tokyo, JP;
Akihiro Koyama, Tokyo, JP;
NIPPON SHEET GLASS COMPANY, LIMITED, Tokyo, JP;
Abstract
Disclosed is a glass flake () having improved heat resistance and improved chemical durability, which is composed of a glass base material satisfying, as expressed in mass %, 60≦SiO≦70, 5≦AlO≦15, 1≦MgO≦10, 10≦CaO≦25 and 4<(LiO+NaO+KO)<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 %.