Aqueous dispersion of polymer for use in water-based glossy varnish.

摘要

The invention relates to a polymer dispersion intended to be used in coating compositions FOR TOPCOATS WITH A high gloss. This dispersion is prepared with monomer compositions AYB, ONE OF WHICH HAS A TG IN STATE polymerised at least 40 ° C, and at least 60 ° C above the Tg of the other composition of monomer in the cured state, BEING THE monomer composition MADE OF COMPOSITE ethylenically unsaturated compounds (1) at least 80% by weight of one or more compounds selected from the group consisting of aromatic monomer OF alkenyl, acrylonitrile, alkyl ester (hetero) cycloalkyl or aralkyl ACRYLIC ACID And methacrylic acid having between 4 and 22 carbon atoms; Acrylamide and methacrylamide N - substituted by an alkyl, cycloalkyl or aralkyl group having 1 to 8 carbon atoms, vinyl acetate and vinyl versatate, containing up to 25% by weight of these COMPUESTOSOPCIONALMENTE a second functional group capable of reacting with A suitable polymerization AGENT, (2) from 0.1 to 5% by weight of a ethylenically unsaturated carboxylic acid and (3) between 0.1 and 5% by weight of a monomer nitrogenous adhesion promoting copolymerizable, ALWAYS at least 60% by weight of the carboxylic acid is incorporated to the monomer composition containing less than 40% by weight of comonomer adhesion promoter, with the mass flow INTRODUCED IN THE rEACTOR monomers cOMPOSITION CONTAINING A SUPERIOR monomer composition of a factor between 1.1 and 11 to the mass flow of the monomers of the monomer composition B added simultaneously to the composition containing the composition of mONOMER O A.