Dental investment compositions in low-dusting powdery form
AssigneeG-C Dental Industrial Corp.
InventorsNobukazu Ohi, Hiroshi Kamohara, Shunichi Futami
Life of this patent
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Abstract
A dental investement composition in the low-dusting powdery form contains (a) a mixture of a soluble phosphate with magnesium oxide or hemihydrate gypsum as a binder, (b) quartz and/or christobalite as a refractory material, (c) one or more wetting agents selected from the group consisting of hydrophobic liquid hydrocarbons, liquid hydrophobic fatty acid esters and liquid hydrophobic fatty acids showing a vapor pressure of 3.15 mmHg or below 20.degree. C., and (d) one or more anionic surface active agents selected from the group consisting of alkylbenzene sulfonates and alkyl sulfates.
Claims14
A low-dusting powder dental investment composition, consisting essentially of:
- (a) a binder which is (1) a mixture of a soluble phosphate with magnesium oxide, or (2) a hemihydrate gypsum;
- (b) a refractory material which is at least one member selected from the group consisting of quartz and cristobalite;
- (c) 0.50 to 5.00 parts by weight of a wetting agent which is at least one member selected from the group consisting of liquid hydrophobic hydrocarbons, liquid hydrophobic fatty acid esters, isosteric acid, oleic acid, linolenic acid, linoleic acid, 2-ethylpentanoic acid, and 2-ethylhexanoic acid;
- wherein said wetting agent has a vapor pressure of 3.15 mm Hg or below at 20.degree. C.;
- (d) 0.01 to 0.50 parts by weight of an anionic surface active agent which is at least one member selected from the group consisting of alkylbenzene sulfonates and alkyl sulfates;
- and
- (e) a setting controlling agent in an amount of from 0% and up to an amount effective for setting controlling;
- wherein the total amount of components (a), (b), (c), (d) and (e) adds up to 100 parts by weight.
Dependencies are inferred from the claim text.