Process for producing heat-resistant and moisture-resistant polyborometallosiloxanes

Claim 1

A process for producing a heat-resistant and moisture-resistant polyborometallosiloxane, which comprises adding (1) a phosphorus or metal compound which compound is selected from the group consisting of salts which are halides, oxyhalides, sulfates, oxysulfates, oxalates and oxyoxalates; alkali metal and ammonium salts of said salts; and acetylacetone complexes; and (2) a compound capable of easily forming a complex with the phosphorus or metal compound, said compound capable of easily forming a complex being selected from the group consisting of ethers, monohydric and polyhydric alcohols, ketones, phenols, heterocyclic compounds containing oxygen as a hetero atom, and chain and cyclic compounds having quinonic oxygen, an aldehyde group, or a carboxyl group in the side chain; to (3) an organoborosiloxane, being a monomer, oligomer or polymer whose main chain consists mainly of B, Si and O elements; the metal in said metal compound being at least one member selected from the group consisting of Ti, Zr, V, Al, Fe, Cr, Co, Ni, Ge, Sn, As, Mg, Pb and Sb; and heating the resulting mixture to a temperature of 550° C. or lower to bond the phosphorus or metal atom to the silicon atom and/or the boron atom through an oxygen atom.