Adhesion promoters for one-component RTV silicone compositions

Claim 1

A method of making a one-package and substantially acid-free room temperature vulcanizable composition curable to the solid elastomeric state, which method comprises agitating under substantially anhydrous conditions at a temperature in the range of from 0° C. to 180° C., a room temperature vulcanizable material selected from (i) a mixture comprising (a) 100 parts of a silanol-terminated polydiorganosiloxane, (b) a stabilizing amount of a scavenger for hydroxy functional groups, (c) 0-10 parts of a polyalkoxy crosslinking agent, (d) an effective amount of a condensation catalyst, (e) 0-5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof, and (f) an effective amount of an adhesion promoter having the formula ##STR35## where R 10 and R 11 are C 1-8 monovalent hydrocarbon radicals, t varies from 0 to 3 and Z is a saturated, unsaturated or aromatic hydrocarbon radical, said hydrocarbon radical further functionalized by a member selected from the group consisting of amino, ether, epoxy, isocyanato, cyano, isocyanurate, acryloxy and acyloxy and mixtures thereof; and (ii) a mixture comprising (a) 100 parts of a polyalkoxy-terminated polydiorganosiloxane, (b) 0-10 parts of a polyalkoxy crosslinking agent, (c) an effective amount of condensation catalyst, (d) a stabilizing amount of scavenger for hydroxy functional groups, (e) 0-5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof, and (f) an effective amount of an adhesion promoter having the formula ##STR36## where R 10 and R 11 are C 1-8 monovalent hydrocarbon radicals, t varies from 0 to 3, and Z is a saturated, unsaturated, or aromatic hydrocarbon radical further functionalized by a member selected from the group consisting of amino, ether, epoxy, isocyanato, cyano, isocyanurate, acryloxy and acyloxy and mixtures thereof.

Claim 2

A method of making a one-package and substantially acid-free room temperature vulcanizable composition curable to the solid elastomeric state, which method comprises agitating under substantially anhydrous conditions at a temperature in the range of from 0° C. to 180° C., a room temperature vulcanizable material selected from (i) a mixture comprising (a) 100 parts of a silanol-terminated polydiorganosiloxane, (b) a stabilizing amount of a scavenger for hydroxy functional groups, (c) 0-10 parts of a polyalkoxy crosslinking agent, (d) an effective amount of a condensation catalyst, (e) 0-5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof, and (f) an effective amount of an adhesion promoter having the formula ##STR35## where R 10 and R 11 are C 1-8 monovalent hydrocarbon radicals, t varies from 0 to 3 and Z is a saturated, unsaturated or aromatic hydrocarbon radical, said hydrocarbon radical further functionalized by a member selected from the group consisting of amino, ether, epoxy, isocyanato, cyano, isocyanurate, acryloxy and acyloxy and mixtures thereof; and (ii) a mixture comprising (a) 100 parts of a polyalkoxy-terminated polydiorganosiloxane, (b) 0-10 parts of a polyalkoxy crosslinking agent, (c) an effective amount of condensation catalyst, (d) a stabilizing amount of scavenger for hydroxy functional groups, (e) 0-5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof, and (f) an effective amount of an adhesion promoter having the formula ##STR36## where R 10 and R 11 are C 1-8 monovalent hydrocarbon radicals, t varies from 0 to 3, and Z is a saturated, unsaturated, or aromatic hydrocarbon radical further functionalized by a member selected from the group consisting of amino, ether, epoxy, isocyanato, cyano, isocyanurate, acryloxy and acyloxy and mixtures thereof.