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US 5,206,272 AGranted
Impression material compositions
AssigneeTokuyama Soda Kabushiki Kaisha
InventorsSunao Urabe, Shouichi Narui
Life of this patent
Estimating the term…
Abstract
This invention relates to an impression material composition comprising an alginate and a gelling agent and being hardened in the presence of water, an unsaturated carboxylic acid polymer being contained in an amount of 5 to 150 parts by weight per 100 parts by weight of the alginate.
Claims23
An impression material composition comprising:
- (A) 100 parts by weight of a water soluble alginate salt,
- (B) 5 to 100 parts by weight of an unsaturated carboxylic acid polymer or its water-soluble salt,
- (C) 30 to 500 parts by weight of anhydrous or hydrated calcium sulfate, and
- (D) 3 to 100 parts by weight of an oxide or hydroxide of a divalent or polyvalent metal which is capable of converting the unsaturated carboxylic acid polymer (B) into its insoluble form, through its reaction with the unsaturated carboxylic acid polymer;
- said composition being characterized in that, it is easily kneaded with water, and after kneading with water the viscosity of the kneaded material increases in two stages, in which
- (1) in the first stage a gel of a water-insoluble, unsaturated carboxylic acid polymer is formed by reaction of above component (B) with the component (D), and thereafter,
- (2) in the second stage a hardened product of a water-insoluble alginate is formed by reaction of above component (A) with the component (C).
4 more elements
An impression material composition comprising
- (A) 100 parts by weight of a water soluble alginate salt,
- (B) 5 to 100 parts by weight of an unsaturated carboxylic acid polymer or its water-soluble salt,
- (C) 30 to 50 parts by weight of anhydrous or hydrated calcium sulfate, and
- (D) 3 to 100 parts by weight of zinc oxide;
- said composition being characterized in that, it is easily kneaded with water, and after kneading with water the viscosity of the kneaded material increases in two stages, in which
- (1) in the first stage a gel of a water-insoluble, unsaturated carboxylic acid polymer is formed by reaction of above component (B) with the component (D), and thereafter,
- (2) in the second stage a hardened product of a water-insoluble alginate is formed by reaction of above component (A) with the component (C).
4 more elements
Dependencies are inferred from the claim text.