Polyalkoxysilyl-terminated polydiorganosiloxanes, methods for their preparation, and room temperature vulcanizable compositions containing them

Polyalkoxysilyl-terminated polydiorganosiloxanes which are relatively stable in viscosity over prolonged storage periods are prepared by endcapping a silanol-ter­minated polydiorganosiloxane in the presence of a catalytic amount of an acidic amine salt which subsequently decomposes to substantially inert products, preferably an amine salt of formic acid, and in the absence of silicon-nitrogen com­pounds and enoxysilanes normally used as catalyst quenchers and scavengers. The products are useful for the preparation of scavenger-free room temperature vulcanizable composi­tions, particularly when combined with certain N-alkoxy­silylalkyl-substituted compounds as adhesion promoters.