Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1980-11-03
1983-04-19
Nussbaum, Marvin L.
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
350 9629, 250227, 528 31, 10628714, 524861, G02B 514
Patent
active
043803679
DESCRIPTION:
BRIEF SUMMARY
FIELD OF ART
This invention relates to a coating material for optical communication glass fibers and more particularly to a silicone type coating material for optical communication glass fibers.
BACKGROUND TECHNIQUE
Optical communication glass fibers are made from glass such as quartz glass and are extremely small in diameter, for which reason they are weak in strength. In order to make up such weakness in strength of optical communication glass fibers and to avoid strain on their surfaces, generally a primary coat is applied onto the surface of those fibers using, for example, nylon, polyethylene, polyurethane, epoxy resin, or silicone resin.
As shown on page 12 of Japanese Patent Laying Open Print No. 100734/76, it is preferable that such primary coat materials have a higher refractive index than that of the clad layer of optical communication glass fibers.
Among those materials, moreover, silicone resin having a higher refractive index than that of the clad layer is considered to be the most preferred material for improving the characteristics of optical communication glass fibers, as is described in Japanese Patent Laying Open Print No. 150050/77.
However, the silicone resin which has heretofore been used in this kind of application is disadvantageous in that the cured film is very hard, that the air bubbles incorporated before or during the coating operation are difficult to be removed, that the components of the composition are less compatible with each other resulting in the curing being slowed down, and that the coated film surface becomes rough.
It is an object of this invention to remedy such disadvantages associated with conventional primary coat materials.
It is another object of this invention to provide a coating material for optical communication glass fibers, characteristic in that the incorporated air bubbles are easy to be removed, that it can be applied easily onto an optical communication glass fiber having a clad layer, that it can be cured quickly, that the adhesion thereof to such glass fiber is satisfactory, and that it can form a smooth film rich in flexibility.
It is a further object of this invention to provide an optical communication glass fiber coated with a coating material having the above-mentioned characteristics.
DISCLOSURE OF THE INVENTION
The aforesaid objects of this invention can be attained by a coating material for optical communication glass fibers and an optical communication glass fiber having a primary coat layer formed by applying the said coating material onto the glass fiber followed by curing said 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 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 of the component (c) as platinum metal being 0.5 to 1,000 ppm of the total amount of both components (a) and (b).
BEST FORM FOR PRACTISING THE INVENTION
This invention is described below more concretely.
The foregoing component (a) in the coating material for optical communication glass fibers of this invention, which is a main component of the coating material of the inventio
REFERENCES:
patent: 3948848 (1976-04-01), Mink
patent: 4114981 (1978-09-01), Ishida et al.
Nussbaum Marvin L.
Toray Silicone Co. Ltd.
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