Vinyl carbosiloxane resins

摘要

This invention is a vinylcarbosiloxane resin that is the hydrosilation reaction product of 1,3,5,7 -tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane and a hydride-terminated linear polysiloxane, siloxane, or silane, having two terminal Si—H hydrogens reactive with vinyl groups in a hydrosilation reaction, in the presence of a platinum catalyst. Suitable hydride-terminated linear polysiloxanes, siloxances, and silanes include those having the structures:;;In another embodiment, the vinylcarbosiloxane resin can be reacted with one or more other hydrido-silanes and hydrido-polysiloxanes in the presence of a platinum catalyst to form a curable composition.

主权项

1. A vinylcarbosiloxane resin that is the hydrosilation reaction product of a mixture comprising A) 1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane and B) a bis(dimethylsilyl) alkylene or a linear polysiloxane having two terminal Si—H capable of reacting with vinyl groups in a hydrosilation reaction selected from the group having the structure:in which R is a C1 to C4 alkyl group or a linear silicone unit of the structure —(O—SiMe2)n or —(O—SiAr2)n or —(O—SiMeAr)n;
in which n is 3 to 5 and represents the number of repeating units; Me is a methyl group; Ar is an aryl group; and R′ and R″ independently are a C1 to C4 alkyl group or an aryl group.