Compositions containing inorganic, organic and organometallic palladium hydrogen scavengers
AssigneeMinnesota Mining and Manufacturing Company
InventorsMark S. Konings, Joel D. Oxman
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Abstract
The present invention provides an addition-curable composition containing an inorganic, organic or organometalic compound of palladium in an amount effective to reduce the amount of hydrogen gas evolved in the reaction of the composition. A preferred embodiment is a dental impression material composition comprising: (a) an addition-curable compound; (b) a crosslinker; (c) a platinum-containing catalyst; and (d) a palladium compound. This generally provides a positive gypsum model of, for example, a dental impression that is substantially free of pits.
Claims34
A composition comprising:
- a) an addition-curable compound;
- b) a crosslinker;
- c) a platinium containing catalyst;
- and
- d) an inorganic, organic or organometallic compound of palladium in an amount effective to reduce the amount of hydrogen gas evolved in the reaction of said composition.
A method of making a positive dental model comprising the steps of a) preparing an impression using a hardenable composition, said composition comprising (i) an addition-curable compound;
- (ii) a crosslinker;
- (iii) a platinum containing catalyst;
- and (iv) an inorganic, organic or organometallic compound of palladium in an amount effective to reduce the amount of hydrogen gas evolved in the reaction of said composition, and b) preparing the positive model from said impression.
A method of making a positive dental model comprising the step of applying an inorganic, organic or organometallic compound of palladium over at least part of the surface of an impression that will contact a positive model material before pouring said model material, said compound of palladium being present in an amount such that the positive model is substantially free of pits.
A method of making a positive dental model comprising the step of scavenging hydrogen gas escaping from an impression by mixing an inorganic, organic or organometallic compound of palladium with a hardenable positive model material prior to pouring said model material, said compound of palladium being present in an amount such that the positive model is substantially free of pits.
Dependencies are inferred from the claim text.