METHOD FOR MAKING MICROPOROUS SILICONE RESINS WITH NARROW PORE-SIZE DISTRIBUTIONS

摘要

A method for preparing a microporous siliconeresin which can be used to form low dielectric constantfilms useful for electrical insulating coatings onelectronic devices comprising (A) contacting ahydridosilicon containing resin with an alkenyltri-arylsilane in the presence of a platinum group metal-containing hydrosilation catalyst effecting formation ofa silicon resin where at least 5 percent of silicon atomsare substituted with at least one triarylsilylalkylenegroup and 45 percent of silicon atoms are substitutedwith at least one hydrogen atom and (B) heating thesilicon resin of step (A) in an inert atmosphere at atemperature sufficient to effect thermolysis of thetriarylsilylalkylene groups from the silicon atoms.