Patent ID: 6124418
Filing Date: 2000-09-26
Classification: C07F,C08G

Abstract:
A method of preventing colloid formation by a haloplatinate catalyst for the hydrosilation of an ethylenically unsaturated epoxide comprising the steps of:(i) providing a hydrosilation reaction mixture comprising an ethylenically unsaturated epoxide and an organohydrogen siloxane or an organohydrogensilane;(ii) mixing in the mixture of step (i) a quaternary ammonium, phosphonium, or arsonium salt, said salt containing a cationic species of the formula MR.sub.4.sup.+ where M is nitrogen, phosphorus, or arsenic and the R groups are, individually, organic radicals comprising C.sub.1-30, substituted or unsubstituted, linear alkyl, or an aryl, alkaryl, or aralkyl radical and a salt of hexahaloplatinic acid; and(iii) reacting the quaternary ammonium, phosphonium, or arsonium salt with the salt of hexahaloplatinic acid to form in situ a haloplatinate hydrosilation catalyst in the hydrosilation mixture and wherein the haloplatinate hydrosilation catalyst promotes the hydrosilation reaction without promoting a ring opening polymerization of the epoxide.