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:
Jan. 19, 2016
Filed:
Aug. 26, 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
A glass flake () having improved heat resistance and chemical resistance is formed from a glass base material satisfying, in mass %, 60≦SiO≦75, 5<AlO≦15, 3≦CaO≦20, 6≦NaO≦20 and 9≦(LiO+NaO+KO)≦13. When 9≦(LiO+NaO+KO)≦13 is satisfied in mass %, the CaO content and the NaO content are preferably set within the ranges of 5≦CaO≦20 and 6≦NaO≦13, respectively. When 13≦(LiO+NaO+KO)≦20 is satisfied in mass %, the CaO content and the Na2O content are preferably set within the ranges of 3≦CaO≦15 and 9≦NaO≦20, respectively. The working temperature of the glass base material is preferably 1180° C.-1300° C. The temperature difference AT obtained by taking the devitrification temperature of the glass base material from the working temperature of the glass base material is preferably 0° C.-200° C. The glass transition temperature of the glass base material is preferably 550° C.-700° C. The acid resistance index ΔW of the glass base material is preferably 0.05-1.5 mass %.