Nippon Sheet Glass Company, Limited

Unitika Ltd.

Unitika Glass Fiber Co., Ltd.

Yoshito Nawa

Takaharu Miyazaki

Riku Sawai

Junji Kurachi

Aya Nakamura

Hidetoshi Fukuchi

Kohji Hattori

Koji Hayashi

Yoshiyuki Inaka

Daisuke Nishinaka

Tomoki Sekida

The present disclosure provides a novel glass composition that has a low permittivity and is suitable for mass production. A glass composition provided satisfies, in wt %, for example, 40&#x2264;SiO&#x2264;60, 25&#x2264;BO&#x2264;45, 0&#x3c;AlO&#x2264;18, 0&#x3c;RO&#x2264;5, and 0&#x2264;RO&#x2264;12, and satisfies at least one of: i) SiO+BO&#x2265;80 and SiO+BO+AlO&#x2264;99.9; and ii) SiO+BO&#x2265;78, SiO+BO+AlO&#x2264;99.9, and 0&#x3c;RO&#x3c;10. Another glass composition provided includes SiO, BO, AlO, RO, and 3&#x3c;RO&#x3c;8 at the same contents as the above, and satisfies SiO+BO&#x2265;75 and SiO+BO+AlO&#x3c;97, where RO=LiO+NaO+KO and RO=MgO+CaO+SrO.

Glass composition, glass fiber, glass cloth, and method for producing glass fiber

The present disclosure provides a novel glass composition that has a low permittivity and is suitable for mass production. A glass composition provided satisfies, in wt %, for example, 40&#x2264;SiO&#x2264;60, 25&#x2264;BO&#x2264;45, 0&#x3c;AlO&#x2264;18, 0&#x3c;RO&#x2264;5, and 0&#x2264;RO&#x2264;12, and satisfies at least one of: i) SiO+BO&#x2265;80 and SiO+BO+AlO&#x2264;99.9; and ii) SiO+BO&#x2265;78, SiO+BO+AlO&#x2264;99.9, and 0&#x3c;RO&#x3c;10. Another glass composition provided includes SiO, BO, AlO, RO, and 3&#x3c;RO&#x3c;8 at the same contents as the above, and satisfies SiO+BO&#x2265;75 and SiO+BO+AlO&#x3c;97, where RO&#x2550;LiO+NaO+KO and RO&#x2550;MgO+CaO+SrO.

A glass composition of the present disclosure includes, in wt %, 50&#x2264;SiO&#x2264;56, 20&#x2264;BO&#x2264;30, 10&#x2264;AlO&#x2264;20, 3.5&#x2264;MgO+CaO&#x2264;10, and 0&#x2264;RO&#x2264;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.

Glass composition, glass fibers, glass cloth, and method for producing glass fibers

Growing community of inventors

Kyoto, Japan

Yoshito Nawa