Abstract: A pigmentary composition prepared by coating metallic particles of pigment by means of a polymer or copolymer, by covering the polymerization or copolymerization "in situ" of at least one ethylenically unsaturated monomer having at least one oxygen or nitrogen heteroatom, and having a mono- or di-carborylic acid function, or an ester, nitrile or amide function or an N-substituted amide function, or an amine, alcohol or ether function, wherein the polymerization or copolymerization reaction is effected in a medium comprising at least one organic solvent in which the monomer is soluble and in the presence of at least one polymerization catalyst soluble in this medium, the monomer and the proportion thereof being selected so that the polymer or copolymer formed is insoluble in the organic solvent used.

Abstract: A process for the preparation of pigmentary compositions which comprises coating the particles of pigment by means of a polymer or copolymer, by covering by the polymerisation or copolymerisation "in situ" of at least one ethylenically unsaturated monomer having at least one polymerisable double bond and containing at least three carbon atoms or at least two carbon atoms and a heteroatom and/or a halogen atom attached to one of the carbon atoms wherein the polymerisation or copolymerisation reaction is effected in a medium comprising at least one organic solvent in which the monomer is soluble, and in the presence of at least one polymerisation catalyst soluble in this medium, the monomer and the proportion thereof being selected so that the polymer or copolymer formed is insoluble in the organic solvent used, the ratio by weight of pigment to resin being from 10/90 to 95/5 and the amount of catalyst being from 0.