Polymer-modified fiber-cement composition
AssigneeRohm and Haas Company
InventorMichael Damian Bowe
Life of this patent
Estimating the term…
Abstract
A method for providing a polymer-modified fiber-cement composite by forming an aqueous composition including admixing an emulsion polymer having a glass transition temperature (Tg) of from −25° C. to 150° C., cement, cellulosic fibers, siliceous material, and water; forming a composite precursor by removal of at least some of the water; and curing/drying the composite precursor at a temperature at least 10° C. higher than the Tg of the polymer is provided. In an alternative embodiment the emulsion polymer is applied to the composite precursor. Polymer-modified fiber-cement composites formed by the method of the invention are also provided.
Claims7
A method for providing a polymer-modified fiber-cement composite comprising
- forming an aqueous composition comprising admixing a flocculated emulsion polymer having a glass transition temperature (Tg) of from −25° C. to 150° C., cement, cellulosic fibers, siliceous material, and water, and removing water by mechanical means followed by curing/drying at a temperature at least 10° C. higher than the Tg of said polymer.
A method for providing a polymer-modified fiber-cement composite comprising
- forming an aqueous composition comprising admixing cement, cellulosic fibers, siliceous material, and water;
- removing water by mechanical means;
- applying an emulsion polymer having a glass transition
- temperature (Tg) of from −25° C. to 150° C. wherein the emulsion polymer flocculates upon contact with the ingredients of the admixture;
- and
- curing/drying at a temperature at least 10° C. higher than the Tg of said polymer.
Dependencies are inferred from the claim text.