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Abstract

Compositions which can be stored in the absence of moisture, but crosslink in the presence of moisture at room temperature to form elastomers comprising a diorganopolysiloxane having terminal condensable groups, a silicon compound having at least three hydrolyzable groups bonded directly to silicon per molecule, an average of at least one acyloxy group being present as a hydrolyzable group per silicon atom in the silicon compound, and an organosilicon compound having at least one vicinal epoxy group, in which at least part of the organosilicon compound containing at least one vicinal epoxy group is a cyclic diorganopolysiloxane. These compositions are prepared by mixing under anhydrous conditions a diorganopolysiloxane having terminal condensable groups with a silicon compound having at least three hydrolyzable groups bonded directly to silicon per molecule, an average of at least one acyloxy group being present as a hydrolyzable group per silicon atom in the silicon compound and an organosilicon compound having at least one vicinal epoxy group, in which at least part of the organosilicon compound containing at least one vicinal epoxy group is a cyclic diorganopolysiloxane.

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First Claim