Utilization of latexes with hydraulic cement and gypsum compositions
AssigneeConstruction Products Research, Inc.
InventorsWarner K. Babcock, David A. Ruefenacht
Life of this patent
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Abstract
This invention relates to improved aluminous cement/gypsum compositions that contain polymer latex emulsions or compounds to produce self-curing, crack-free, fast-setting, high early strength, high bonding, water resistant, durable, cementitious mixtures for finishing, coating, plastering, stucco, rigid insulation protection, topping, resurfacing, patching, motaring, tile grouting, concrete, and the like. In addition, this invention discloses a method for improving the properties and performance of aluminous cement/gypsum compositions by adding certain types, amounts and/or combinations of polymer latex emulsions or compounds with or without the addition of wet expansion and drying shrinkage inhibitors.
Claims35
A method for reducing the wet expansion and drying shrinkage of an aluminous cement which comprises adding thereto:
- (a) gypsum in an amount above about 5 to about 55 percent by weight based on the amount of the aluminous cement to reduce drying shrinkage;
- and
- (b) a first polymer latex emulsion such that the percent polymer solids based on the amount of the aluminous cement and gypsum is about 1 to 25 percent by weight to reduce wet expansion.
A method for reducing the drying shrinkage of an aluminous cement which comprises adding thereto:
- (a) gypsum in an amount of above about 5 to about 55 percent by weight based on the amount of the aluminous cement to reduce drying shrinkage;
- and
- (b) a first polymer latex emulsion such that the percent polymer solids based on the amount of the aluminous cement and gypsum is about 1 to 25 percent by weight to further reduce drying shrinkage.
A method for reducing the wet expansion of a cementitious composition comprising aluminous cement in an amount of 60 to 95 weight percent and gypsum in an amount of 5 to 40 weight percent, which method comprises adding thereto a first polymer latex emulsion such that the percent polymer solids based on the amount of aluminous cement and gypsum in the cementitious composition is about 1 to 25 weight percent to inhibit wet expansion.
A method for reducing the drying shrinkage of a cementitious composition comprising aluminous cement in an amount of about 60 to 95 weight percent and gypsum in an amound of about 5 to 40 weight percent, which method comprises adding a first polymer latex emulsion such that the percent polymer solids based on the amount of aluminous cement and gypsum in the cementitious composition is about 1 to 25 weight percent to reduce the drying shrinkage.
A method for reducing the wet expansion and drying shrinkage of a cementitious composition comprising aluminous cement which comprises adding thereto:
- (a) gypsum in an amount of about 5 to 40 percent by weight based on the amount of aluminous cement to reduce drying shrinkage;
- and
- (b) a first polymer latex emulsion such that the percent polymer solids based on the amount of the aluminous cement and gypsum is about 2 to 15 percent by weight to reduce wet expansion.
A method for reducing the drying shrinkage of an aluminous cement which comprises adding thereto:
- (a) gypsum in an amount of above about 10 to about 25 percent by weight based on the amount of the aluminous cement to reduce drying shrinkage;
- and
- (b) a polymer latex emulsion such that the percent polymer solids based on the amount of the aluminous cement and gypsum is about 2 to 15 percent by weight to further reduce drying shrinkage.
Dependencies are inferred from the claim text.