Coating material for optical communication glass fibers
AssigneeToray Silicone Company, Ltd.
InventorToshio Suzuki
Life of this patent
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Abstract
Provided is a coating material for optical communication glass fibers comprising a vinyl group terminated methylphenylpolysiloxane, a methylhydrogenpolysiloxane or a methylphenylhydrogenpolysiloxane, and a platinum catalyst. This coating material is superior in coating work efficiency onto optical communication glass fibers, cures quickly and can afford an optical communication glass fiber of high quality having a closely adhered cured film rich in flexibility and uniformity.
Claims6
A coating material for optical communication glass fibers, comprising the following components (a), (b) and (c):
- (a) a vinyl group terminated methylphenylpolysiloxane having a viscosity at 25.degree. C. of 100 to 15,000 cP and with a methyl/phenyl molar ratio in the range of 1/1 to 10/1, the amount of the component (a) being 100 parts by weight,
- (b) at least one organohydrogenpolysiloxane selected from the group consisting of a methylhydrogenpolysiloxane having a viscosity at 25.degree. C. of 0.7 to 5,000 cP and containing at least three silicon atom bonded hydrogen atoms in one molecule, and a methylphenylhydrogenpolysiloxane having a viscosity at 25.degree. C. of 0.7 to 5,000 cP, containing at least three silicon atom bonded hydrogen atoms in one molecule and with a methyl/phenyl molar ratio not smaller than 1/1, the amount of the component (b) being an amount by weight required to provide a molar ratio of the silicon atom bonded hydrogen atoms in the component (b) to the silicon atom bonded vinyl groups in the component (a) of 0.8/1 to 10/1, and
- (c) platinum or a platinum compound, the amount by weight of the component (c) being 0.5 to 1,000 ppm in terms of platinum metal based on the total amount of the components (a) and (b).
An optical communication glass fiber having a primary coat layer formed by applying a composition onto said glass fiber followed by curing, said composition comprising:
- (a) a vinyl group terminated methylphenylpolysiloxane having a viscosity at 25.degree. C. of 100 to 15,000 cP and with a methyl/phenyl molar ratio in the range of 1/1 to 10/1, the amount of the component (a) being 100 parts by weight,
- (b) at least one organohydrogenpolysiloxane selected from a methylhydrogenpolysiloxane having a viscosity at 25.degree. C. of 0.7 to 5,000 cP and containing at least three silicon atom bonded hydrogen atoms in one molecule, and a methylphenylhydrogenpolysiloxane having a viscosity at 25.degree. C. of 0.7 to 5,000 cP, containing at least three silicon atom bonded hydrogen atoms in one molecule and with a methyl/phenyl molar ratio not smaller than 1/1, the amount of the component (b) being an amount by weight required to provide a molar ratio of the silicon atom bonded hydrogen atoms in the component (b) to the silicon atom bonded vinyl groups in the component (a) of 0.8/1 to 10/1, and
- (c) platinum or a platinum compound, the amount by weight of the component (c) being 0.5 to 1,000 ppm in terms of platinum metal based on the total amount of the components (a) and (b).
Dependencies are inferred from the claim text.