CURED COMPOSITIONS TRANSPARENT TO ULTRAVIOLET RADIATION

摘要

A curable coating composition that may be converted to a cured coating for an optical fiber during a continuous fiber coating process. The curable coating composition comprises an organohydrogenpolysiloxane, an alkenyl functional polysiloxane, and an ultraviolet radiation absorbing hydrosilation photocatalyst in an amount for crosslink formation between the organohydrogenpolysiloxane and the alkenyl functional polysiloxane. The curable coating composition crosslinks under the influence of ultraviolet radiation to provide a cured coating having a high level of transparency to ultraviolet radiation. Application of heat to the curable coating composition accelerates the rate of cured coating formation. The high level of transparency of the cured coating allows from about 70% to about 99% of radiation of wavelengths from about 240 nm to about 275 nm to pass through the coating for writing a refractive index grating to produce an optical fiber Bragg grating.