OXYGEN-CURABLE MERCAPTOORGANOSILOXANE COMPOSITIONS CATALYZED BY COBALTOCENE COMPOUNDS AND METHOD OF FORMING HIGHER MOLECULAR WEIGHT PRODUCTS THEREFROM

摘要

ABSTRACT OF THE DISCLOSURECompositions stable in the absence of oxygen areformed by mixing the following substantially in the absenceof oxygen(A) mercapto-functional organosiloxanes containing atleast two mercapto groups per molecule,(B) optionally, a filler, and(C) a catalytic amount of a cobaltocene of the formula(R3C5H4)Co(C5H4R4), wherein each R3 and R4 is hydrogenor methyl, preferably, 0.01-6 parts by weight of(C5H5)2Co per 100 parts by weight of (A) above.The compositions polymerize or cure upon exposure tooxygen. By utilizing various types and amounts ofmercapto-functional organosiloxanes, higher molecularweight products useful as encapsulating gels, coatingresins, or elastomeric sealants can be obtained by themethod of exposing the compositions of the presentinvention to oxygen.