Patent ID: 7285182

Claim:
A surface treated paper or paperboard comprising paper or paperboard surface treated with a surface treating composition comprising a) a nanoparticle fraction comprising nanoparticles, and b) A carrier fraction comprising plate-like pigment particles and at least one binder, wherein the carrier fraction is obtained by mixing the plate-like pigment particles with the binder before combining the carrier fraction with the nanoparticle fraction and the nanoparticles are between 15 and 75 nm, wherein the binder is a latex, a water soluble binder or mixtures thereof, and the water soluble binders are selected from the group consisting of starch, protein, carboxymethyl cellulose, other cellulose derivative, polyvinyl alcohol and mixtures thereof, and the latex is selected from the group consisting of styrene butadiene, acrylate, styrene acrylate, polyvinyl acetate and mixtures thereof and the binder is between 15 to 75% of the solids content of the carrier fraction.