Compositions: coating or plastic – Coating or plastic compositions – Molds and mold coating compositions
Patent
1989-01-03
1991-06-25
Group, Karl
Compositions: coating or plastic
Coating or plastic compositions
Molds and mold coating compositions
106 35, 106772, 106783, 106788, C04B 2814, B28B 734
Patent
active
050264281
ABSTRACT:
In the production of plaster articles, for example, dental dies and moulds, powdered gypsum (calcium sulphate) is mixed with an aqueous solution of boric acid and/or silicic acid.
By incorporating boric acid and/or silicic acid in the mix, the hardness and setting characteristics of the mix are improved. In a typical application the concentration of boric acid in the aqueous solution is from 0.3 to 1.1 grams boric oxide per liter of solution and the preferred concentration of silicic acid in the aqueous solution is within the range of from 75 mls to 300 mls concentrated silicic acid per liter of aqueous solution.
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patent: 3393116 (1968-07-01), Larson et al.
patent: 3436236 (1969-04-01), Gamber et al.
patent: 3520708 (1970-07-01), Prytherch et al.
patent: 3598621 (1971-08-01), Ferrara et al.
patent: 4148660 (1979-04-01), Lankard et al.
patent: 4526619 (1985-07-01), Ohi et al.
patent: 4647311 (1987-03-01), Ohi et al.
Group Karl
Mosely Neal J.
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