Appeal No. 1996-3214 Page 3
Application No. 08/195,897
14. A method of preventing colloid formation by a
haloplatinate catalyst for the hydrosilation of vinyl expoxides
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 +
4
where M is nitrogen, phosphorus, or arsenic and the R
groups are, individually, organic radicals comprising C ,
1-30
substituted or unsubstituted, linear alkyl, or an aryl, alkaryl
or aralkyl radical and haloplatinate hydrosilation catalyst;
and
(iii) reacting the salt with the catalyst to form in situ
a haloplatinate hydrosilation catalyst in the hyrosilation
mixture and whereby said salt prevents colloid formation of
said catalyst.
15. The method of claim 14 wherein the quaternary salt is
tetra-n-butyl ammonium bromide.
16. The method of claim 15 wherein the hexahaloplatinic
acid is potassium hexachloroplatinate.
17. The method of Claim 14 wherein the hexahaloplatinic
acid is added after quaternary ammonium, phosphonium or
arsonium slat has been added to the hydrosilation mixture.
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