Glass fiber and method for producing the same
AssigneeNippon Sheet Glass Co., Ltd.
InventorsAya Nakamura, Hidetoshi Fukuchi, Masanori Shojiya
Life of this patent
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Abstract
A glass fiber according to the present invention is suitable for preventing filament breakage and suitable for being stably produced for a long term, and has a ß-OH value of 0.02 mm−1 or more and less than 0.55 mm−1. The preferred content of SO3 is more than 0 ppm and 70 ppm or less on a mass basis. The glass fiber is preferably substantially free of As and Sb. SO3 can be supplied to a glass raw material as, for example, a sulfuric acid salt of an alkali metal or an alkaline-earth metal.
Claims30
A glass fiber having a β-OH value of 0.02 mm−1 or more and less than 0.55 mm−1, comprising, in mass %:
- SiO2
- 45 to 80%;
- Al2O3
- 0 to 40%;
- B2O3
- 0 to 30%;
- MgO
- 0 to 30%;
- CaO
- 0 to 30%;
- SrO
- 0 to 30%;
- Li2O
- 0 to 4.5%;
- Na2O
- 0 to 5%;
- and
- K2O
- 0 to 5%.
- wherein, in mass %, the content of SiO2 is 45 to 73% and/or the content of Al2O3 is 10 to 40%.
A glass fiber having a β-OH value of 0.02 mm−1 or more and less than 0.55 mm−1, wherein
- the glass fiber is substantially free of As and Sb, and
- the content of SO3 is more than 0 ppm and 75 ppm or less on a mass basis.
A glass fiber having a β-OH value of 0.35 mm−1 to 0.53 mm−1, wherein
- the content of SO3 is 20 ppm to 70 ppm on a mass basis.
Dependencies are inferred from the claim text.