Appeal No. 1996-3214 Page 2
Application No. 08/195,897
This is a decision on appeal from the examiner's final
rejection of claims 14 through 20, which are all of the claims
pending in this application.
BACKGROUND
Appellants' invention relates to an in situ catalyst
preparation method that prevents colloid formation including
the steps of: (1) forming a hydrosilation reaction mixture
containing; (a) an ethylenically unsaturated epoxide, (b)
either an organohydrogen siloxane or an organohydrogensilane,
(c) a quaternary ammonium, phosphonium, or arsonium salt of a
specified formula, and (d) a catalytic material comprising a
salt of hexahaloplatinic acid (specification, page 16, line 24
through page 17, line 3); and (2) reacting the salt with the
catalytic material to form a product hydrosilation catalyst in
situ. According to appellants' specification (pages 9 and 10),
the onium salt is believed to stabilize platinum, for example,
as a quaternary bis(onium) hexahaloplatinate catalyst product.
Thus, the formation of colloidal platinum is allegedly
discouraged. Exemplary claims 14 through 17 are reproduced
below.
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