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:
Nov. 16, 2021
Filed:
May. 18, 2018
Nippon Sheet Glass Company, Limited, Tokyo, JP;
Unitika Ltd., Amagasaki, JP;
Unitika Glass Fiber Co., Ltd., Uji, JP;
Yoshiyuki Inaka, Mie, JP;
Takaharu Miyazaki, Nara, JP;
Koji Hayashi, Kyoto, JP;
Riku Sawai, Kyoto, JP;
Yoshito Nawa, Kyoto, JP;
Daisuke Nishinaka, Gifu, JP;
Tomoki Sekida, Kyoto, JP;
NIPPON SHEET GLASS COMPANY, LIMITED, Tokyo, JP;
UNITIKA LTD., Amagasaki, JP;
UNITIKA GLASS FIBER CO., LTD., Uji, JP;
Abstract
A glass composition of the present disclosure includes, in wt %, 50≤SiO≤56, 20≤BO≤30, 10≤AlO≤20, 3.5≤MgO+CaO≤10, and 0≤RO≤1.0, further includes FeO, and has a permittivity of less than 5.0 at a frequency of 1 MHz. R is at least one element selected from Li, Na, and K. The glass composition of the present disclosure is a low-permittivity glass composition with which the occurrence of fiber breakage during fiber forming can be reduced even when glass fibers to be formed have a small fiber diameter, and the occurrence of defects such as fiber breakage and fluffing during processing of the glass fibers can be reduced.