Patent ID: 6265336
Filing Date: 2001-07-24
Classification: C04B

Abstract:
A process for making a boron-carbon-silicon ceramic, comprising the step of:pyrolyzing at a temperature and for a time an organoboron thermoset polymer having a repeating unit of formula (1): ##STR24##wherein:(1) n and n' are integers from 1 to 12 and u, u', y, y' and y"" are positive integers;(2) --(C.dbd.C).sub.n -- and --(C.dbd.C).sub.n' -- represent cross-linked alkenyl moieties and n and n' are as previously indicated;(3) R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7 and R.sup.8 are selected from the group consisting of saturated aliphatic, unsaturated aliphatic, aromatic, fluorocarbon moieties and mixtures thereof; ##STR25##represents a carboranyl group;(5) q and q' are integers from 3 to 16;(6) x and x' represent integers greater than or equal to zero;(7) A is selected from the group consisting of O, an aliphatic bridge, an aryl bridge and mixtures thereof;(8) E is selected from the group consisting of O, an aliphatic bridge, an aryl bridge and mixtures thereof; and(9) E and A may be the same or different.