Patent ID: 6455615
Filing Date: 2002-09-24
Classification: C04B

Abstract:
A method for making a cementitious waterproofing material, comprising:kneading a hydraulic cement, a polymer dispersion, a water-soluble polymer, a re-dispersible powder resin, or a mixture thereof with water to obtain a kneaded material at a weight ratio of cement to polymer in the range of about 100:15 to about 100:150 under conditions of about 25Â° C. to about 120Â° C., and about 20 rpm to about 80 rpm until the water content of the kneaded material reaches about 5% to about 20%, mixing the kneaded material with a toughening polymer at a weight ratio of kneaded material to toughening polymer in the range of about 100:10 to about 100:50 at a temperature of about 40Â° C. to about 85Â° C. to enhance its toughness; and calendering the resulting composition into sheets, wherein the toughening polymer is one of rubber, thermoplastic elastomer, thermoplastic resin or combination thereof.