Patent ID: 6458887
Filing Date: 2002-10-01
Classification: C10M,C10N

Abstract:
A process for preparing an aqueous emulsion of polymer for the treatment of a metal surface, comprising the steps of:preparing an organic mixture comprising monomers of said polymer and a free radical polymerization initiator, said monomers comprising at least one monomer M1, chosen from the group consisting of acrylic acid esters and methacrylic acid esters, and at least one acrylic or methacrylic monomer M2 having an acid, amide, amine or epoxy group, the monomers M1 and M2 representing at least 30% of the total weight of the organic mixture and the at least one monomer M2 representing less than 25% of the total weight of the organic mixture, in an aqueous phase containing a surfactant suitable for emulsification, miniemulsifying said organic mixture to form colloids of said mixture, copolymerizing said monomers in a miniemulsion by activation of the initiator, characterized in that: said organic mixture also comprises at least 0.1% by weight of oil, the miniemulsion is prepared in the presence of at least one cosolvent added in a quantity representing at least 0.7% by weight relative to the total weight of the organic mixture and the aqueous phase.