Cements
AssigneeNational Research Development Corporation
InventorsStephen Crisp, Alan D. Wilson
Life of this patent
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Abstract
A poly(carboxylate) cement pack comprises as one component a water soluble poly(carboxylic acid) or a precursor thereof, and as another component an aluminosilicate glass, the ratio of acidic to basic oxides in the glass being selected such that the glass will react with a poly(carboxylic acid) in the presence of water to form a poly(carboxylate) cement.
Claims22
A water hardenable cement composition which comprises a poly(carboxylic acid) or anhydride thereof which forms the poly(carboxylic acid) in the presence of water, an aluminosilicate glass comprising from 0 up to 8 percent by weight of fluorine, the ratio of acidic to basic oxides in the glass being from 0.1 to 3.0 that the glass will react with said poly(carboxylic acid) in the presence of water to form a poly(carboxylic) cement, and a water soluble chelating agent.
A composition, according to claim 10, in which the weight ratio of aluminosilicate glass to said equeous solution is from 0.5:1 to 5:1.
A process for the preparation of a poly(carboxylate) cement which comprises mixing a water soluble poly(carboxylic acid) or anhydride thereof which forms the poly(carboxylic acid) in the presence of water with an aluminosilicate glass comprising from 0 up to 8 per cent by weight of fluorine and a water soluble chelating agent in the presence of water, the ratio of acidic to basic oxides in the glass being from 0.1 to 3.0 such that the glass will react with said poly(carboxylic acid) to form a poly(carboxylate) cement.
Dependencies are inferred from the claim text.