Abstract: The present invention relates to a composition formed of metal pigments and to a process for their preparation. The composition is composed of metal particles FP and a liquid, the liquid being an ester of a fatty acid R?-COOR in which R? is a saturated or unsaturated aliphatic group having from 9 to 20 carbon atoms and R is an alkyl having from 1 to 8 carbon atoms. It is obtained by a process which consists in introducing starting particles of the metal (SP) into a liquid vehicle and in subjecting the mixture thus obtained to milling, said liquid vehicle being said fatty acid ester. Uses: preparation of paints, of inks, of plastics or of cosmetic compositions.

Abstract: A method for coating aluminum particles with a polymer film, includes the following steps: (A) providing an aqueous dispersion of metal aluminum particles using surfactants, the aluminum particles being contacted with S2O82? persulphate anions; then (B) providing an emulsion type polymerization in the aqueous dispersion thus obtained, by introducing into the dispersion monomers whereof the free radical polymerization is initiated by the persulphate anions, or by introducing into the emulsion monomers and an initiator for polymerizing the monomers, whereby a polymer film is formed on the surface of the aluminum particles. The invention also concerns pigment compositions based on aluminum particles coated with polymer films, obtainable by the method, as well as the use of the compositions for formulation of paints having a metallized appearance.

Abstract: A pigment composition contains aluminium metal-based particles (p), the particles (p) including a surface oxidation layer having an average thickness of at least 5 nm. In addition, the aforementioned particles (p) are coated with a protective layer having hydrocarbon chains R which are linked to the surface of the particles (p) by [particle]-Al—O—Si—R linkages. The invention also relates to method of preparing the inventive pigment compositions as well as the use thereof, in particular, for the formulation of water-based metallic paints.