Appeal No. 1998-0138
Application 08/381,809
amount; (b) a polyorganosiloxane having at least two alkenyl groups per molecule; (c) a
polyorganosiloxane having at least two SiH groups per molecule; and (d) a hydrosilylation catalyst. The
palladium compound (component (a)) is also limited to those that “exhibit[] substantially no
hydrosilylation catalytic activity.” The method claims include the steps of adding a heat-stabilizing
amount of palladium containing component (a) to components (b), (c) or (d) and forming the silicone
rubber by addition crosslinking of components (b), (c) and (d).
Representative claims 5, 6 and 16 are reproduced below:
5. An addition-crosslinking silicone composition crosslinkable to a silicone
rubber displaying increased heat resistance, comprising:
a) an effective, heat-stabilizing amount of a palladium
heat-stabilizing compound;
b) a polyorganosiloxane having at least two alkenyl groups per
molecule;
c) a polyorganosiloxane having at least two SiH groups per
molecule;
d) a hydrosilylation catalyst;
wherein said palladium compound a) exhibits substantially no
hydrosilylation catalytic activity, and wherein the heat resistance of said
silicone rubber is greater than an otherwise similar rubber not containing
said palladium compound a).
6. The composition of claim 5 wherein said palladium heat-stabilizing
compound is selected from the group consisting of:
PdX , L PdX , L Pd X , L PdX , L PdX , PdL , M PdX or2 2 2 2 2 2 4 2 2 4 4 2 4
M PdX , in which
2 6
X is an inorganic ligand selected from the group
consisting of the halides, NO , NO , 0.5 SO ,2 3 4
and CN; a carboxylic acid radical of the
formula OCOR’ in which R’ is an unsubstituted
or substituted alkyl, cycloalkyl, or aryl radical
having 1-20 carbon atoms; a complexing
unsubstituted or substituted organic anion; and
OH;
2
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