Additives for hydraulic cement compositions
AssigneeW. R. Grace & Co.-Conn.
InventorsWillis A. Weigand, Chiara F. Ferraris, James M. Gaidis, Ellis M. Gartner
Life of this patent
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Abstract
The present invention provides additives for hydraulic cement compositions, particularly masonry cements, which improve the water-repellancy, workability, and board life of said compositions. The additives of the invention comprise a water-insoluble, water-repelling acid, a set retarding composition, an emulsifier, and a polymer selected from the group consisting of polyvinyl alcohol, polyvinyl acetate, hydroxypropyl substituted polysaccharides, and mixtures thereof.
Claims18
A stable oil-in-water emulsion cement additive comprising:
- a) from about 50 to 95% by weight, based on the total solids, of a water-insoluble, water-repelling acid component selected from the group consisting of fatty acids, rosin acids, and mixtures thereof;
- b) from about 3 to 35% by weight, based on the total solids, of a set retarding component;
- c) from about 2 to 20% by weight, based on the total solids, of a low molecular weight workability-enhancing polymer component selected from the group consisting of polyvinyl alcohol;
- hydroxypropyl substituted polysaccharides;
- polyvinyl acetate;
- and mixtures thereof;
- wherein said workability-enhancing polymer is dissolved in said cement additive;
- d) an amount of an emulsifier component effective to provide an emulsion;
- and
- e) water.
A method of making cement comprising the step of intergrinding Portland cement clinker with a stable oil-in-water emulsion cement additive comprising:
- a) from about 50 to 95% by weight, based on the total solids, of a water-insoluble, water-repelling acid comopnent selected from the group consisting of fatty acids, rosin acids, and mixtures thereof;
- b) from about 3 to 35% by weight, based on the total solids, of a set retarding component;
- c) from about 2 to 20% by weight, based on the total solids, of a low molecular weight workability-enhancing polymer component selected from the group consisting of polyvinyl alcohol;
- hydroxypropyl substituted polysaccharides;
- polyvinyl acetate;
- and mixtures thereof;
- wherein said workability-enhancing polymer is dissolved in said cement additive;
- d) an amount of an emulsifier component effective to provide an emulsion;
- and e) water.
Dependencies are inferred from the claim text.