Vinyl- and alkoxy-functional organosilicon compounds and method for the preparation thereof
AssigneeDow Corning Toray Silicone Co., Ltd.
InventorsToshio Saruyama, Masahiko Suzuki
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Abstract
Vinyl- and alkoxy-functional organosilicon compounds with the general formula ##STR1## in which R denotes C.sub.1 and C.sub.4 alkyl and a is 1, 2, or 3, b is 0 or 1, and a+b is 2 or 3 are made by an exchange reaction between sym-divinyltetramethyldisiloxane and vinyltrialkoxysilane or tetraalkoxysilane. These novel vinyl- and alkoxy-functional organosilicon compounds exhibit a high condensation reactivity with the silanol group.
Claims11
A vinyl- and alkoxy-functional organosilicon compound with a general formula ##STR6## in which R denotes C.sub.1 to C.sub.y alkyl and a is 1, 2, or 3, b is 0 or 1, and a+b is 2 or 3.
A method for the preparation of a vinyl- and alkoxy-functional organosilicon compound with a general formula ##STR7## in which R denotes C.sub.1 to C.sub.4 alkyl and a is 1, 2, or 3, b is 0 or 1, and a+b is 2 or 3, comprising mixing sym-divinyltetramethyldisiloxane and vinyltrialkoxysilane or tetraalkoxysilane in the presence of an acid catalyst and heating at a temperature of from 70.degree. C. and 150.degree. C. promoting an exchange reaction between sym-divinyltetramethyldisiloxane and vinyltrialkoxysilane or heating at a temperature of from 70.degree. C. to 200.degree. C. promoting an exchange reaction between sym-divinyltetramethyldisiloxane and tetraalkoxysilane, where the alkoxy of the vinyltrialkoxysilane and tetraalkoxysilane is oxygen bonded to an alkyl containing from one to four carbons.
A composition curable at room temperature comprising a polydiorganosiloxane with silicon bonded condensable groups and a vinyl- and alkoxy-functional organosilicon compound with a general formula ##STR8## in which R denotes C.sub.1 to C.sub.4 alkyl and a is 1, 2, or 3, b is 0 or 1, and a+b is 2 or 3.
Dependencies are inferred from the claim text.