Cyclic aminoalkylsilanes and their use as adhesion promoters in room temperature vulcanizable polydiorganosiloxane compositions
AssigneeGeneral Electric Company
InventorJudith Stein
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Abstract
Cyclic aminoalkylsilane compositions are prepared by the reaction of approximately equimolar amounts of an aminoalkyltrialkoxysilane such as 3-aminopropyltrimethoxy-silane and a glycidyl ether such as methyl glycidyl ether. They are useful as adhesion promotors in room temperature vulcanizable compositions comprising polyalkoxysilyl-terrninated polydiorganosiloxanes.
Claims14
A method for improving adhesion to a substrate of a room temperature vulcanizable composition comprising a polyalkoxy-terminated polydioganosiloxane and a catalytic amount of a curing catalyst, said method comprising incorporating therein an adhesion improving amount of a cyclic aminoalkysilane having the formula ##STR8## wherein R.sup.1 is C.sub.1-8 alkyl, each R.sup.2 is independently hydrogen or C.sub.1-4 primary or secondary alkyl, R.sup.3 is methyl or ethyl and n is 2 or 3.
A room temperature vulcanizable composition comprising (A) at least one polyalkoxy-terminated polydiorganosiloxane, (B) a catalytic amount of a curing catalyst, and (C) an amount of effective to enhance adhesion to a substrate of a cyclic aminoalkylsilane having the formula ##STR9## wherein R.sup.1 is C.sub.1-8 alkyl, each R.sup.2 is independently hydrogen or C.sub.1-4 primary of secondary alkyl, R.sup.3 is methyl or ethyl and n is 2 or 3.
Dependencies are inferred from the claim text.