Catalyst and composition for silicone dental impression materials
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United States of America Patent
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Dec 7, 1999
Grant Date -
N/A
app pub date -
Feb 17, 1998
filing date -
Mar 11, 1997
priority date (Note) -
Expired
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Abstract
A curable silicone dental impression composition is presented, preferably comprising a polyorganohydrogensiloxane having at least one silicon-bonded hydrogen atom; a silicone polymer having at least alkenyl groups; a vinyl siloxane/platinum/palladium catalyst complex; and inorganic fillers and other additives known in the art. The catalyst in accordance with the present invention is a complex of 1,3-divinyltetramethyldisiloxane and hexachloroplatinic acid doped with palladium, and prevents outgassing of hydrogen. The final catalyst complex has a platinum content in the range from about 1.1%-1.2% platinum and 500-600 ppm palladium.
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