Title: Glass composition for alkali-resistant glass fiber

Abstract: This invention relates to a glass composition for alkali-resistant glass fiber, which comprises: (a) 30 - 57% by weight of SiO.sub.2 ; (b) 12 - 26% by weight of ZrO.sub.2 ; (c) 14 - 26% by weight of R.sub.2 O (wherein R represents Na, K or Li); (d) 1 - 11% by weight of R'O (wherein R' represents Ca, Ba, Mg, Zn or Co); (e) 0.1 - 6% by weight of CaF.sub.2 ; (f) 0.1 - 10% by weight of M.sub.2 (SiF.sub.6) (wherein M represents Na, K or Li); and (g) 0.1 - 12% by weight of B.sub.2 O.sub.3. This invention further relates to a glass composition for alkali-resistant glass fiber, which comprises: (a) 30 - 57% by weight of SiO.sub.2 ; (b) 12 - 25% by weight of ZrO.sub.2 ; (c) 14 - 26% by weight of R.sub.2 O (wherein R represents Na, K or Li); (d) 1 - 11% by weight of R'O (wherein R' represents Ca, Ba, Mg, Zn or Co); (e) 0.1 - 6% by weight of CaF.sub.2 ; (f) 0.1 - 10% by weight of M.sub.2 (SiF.sub.6) (wherein M represents Na, K or Li); (g) 0.1 - 12% by weight of B.sub.2 O.sub.3 ; (h) an effective amount of up to 3% by weight of TiO.sub.2 ; (i) an effective amount of up to 3% by weight of Al.sub.2 O.sub.3 ; and (j) an effective amount of up to 3% by weight of Fe.sub.2 O.sub.3.

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Other info:

Inventors: Iizawa, Yoshihiro (Tokorozawa, JP)

Application Number: 881893
Filing Date: 1978-02-27
Publication_date: 1979-03-06
Assignee: Ikebukuro Horo Kogyo Co., Ltd. (JP)
Primary Class(es): 501/38 501/58, 501/59, 501/77, 501/79
Other Classes:
US Patent Ref:

3861926	Jan, 1975	Irlam et al.	106/50.
3861927	Jan, 1975	Kimma et al.	106/50.
3969121	Jul, 1976	Atkinson	106/50.
4014705	Mar, 1977	Yale	106/50.
4066465	Jan, 1978	Mohri et al.	106/50.

Other Refs:
Primary Examiner: Vertiz, O. R.
Assistant Examiner: Bell, Mark
Attorney: Wenderoth, Lind & Ponack