Patent ID: 6406536
Filing Date: 2002-06-18
Classification: C04B

Abstract:
A process for the preparation of a mixture of additives, for a dry premix which comprises as inorganic components at least one hydraulic binder and at least a photocatalyst that oxidizes, in the presence of light, air and ambient humidity, the pollutant substances present in the environment, or of a cementitious composition which comprises as inorganic components at least one hydraulic binder and at least a photocatalyst that oxidizes, in the presence of light, air and ambient humidity, the pollutant substances present in the environment, said process comprising the step of combining together the following organic additives:a) at least one melamine resin, obtained from condensation of melamine with formaldehyde; b) at least one cellulose ether; câ€²) at least one polymer chose n from among an ethylene polymer, an acrylic polymer, a terpolymer comprising as co-monomers at least one ester of acrylic acid with an alcohol and at least one ester of vinyl alcohol with a carboxylic acid; or alternatively to the component câ€²: câ€³) at least an acrylic latex; and d) at least one chemically modified starch.