Patent ID: 8754149

Claim:
A photocatalytic cement composition satisfactory for use as a fluid paint, without dripping, or a render, or a plaster at the same time, the plaster having a viscosity greater than that of the fluid paint, for forming a protective coating onto a surface against environmentally polluting substances including nitrogen oxides NO and NO x , comprising the following organic and inorganic ingredients: a) a superfluidifying agent which is a sulphonated naphthalene, or an acrylic polymer; b) at least one cellulosic ether with a viscosity in the range between 300 and 7000 mPa·s, measured as Brookfield viscosity, 2% solution at a temperature of 20° C.; c′) at least one adhesive polymer, which is different from the polymer used as a superfluidifying agent a) selected from the group consisting of an ethylenic polymer, an acrylic polymer, and a terpolymer including as comonomers at least one ester of acrylic acid with an alcohol and at least one ester of vinyl alcohol with a carboxylic acid; or as an alternative to c′) c″) latex selected from the group consisting of an acrylic latex, a styrene latex, and a butadiene latex, together with water, a photocatalyst, a hydraulic binder and a filler, and containing no starch or chemically modified derivatives thereof, the degree of NO and NO x lowering provided by said protective coating being between 80% and 85%, and wherein the composition excludes a melamine resin.