Patent ID: 6336347
Filing Date: 2002-01-08
Classification: C03B,C03C

Abstract:
Process for producing a high-purity optical silica preform, comprisinga) vaporization of an organosilicon compound; b) thermal decomposition of the said organosilicon compound in the vapour state by a combustion process to give amorphous fused silica particles; c) deposition of the said amorphous fused silica particles on a support to form the high purity optical silica preform; and characterized in that the said organosilicon compound has the following formula in whichR1, R2 and R3 are each, independently, hydrogen, methyl, ethyl, propyl, isopropyl or a group of formula â€”Siâ€”(R5 R6 R7), where R5, R6 and R7 are each, independently, methyl, ethyl, propyl or isopropyl, and R4 is a group of formula â€”(CH2)mâ€”Siâ€”(R5 R6 R7), where R5, R6 and R7 are as defined above and m is an integer between 0 and 3.