AQUEOUS SELF-CROSSLINKABLE POLYMER DISPERSION MADE FROM HARD-CORE, SOFT-SHELL STRUCTURED POLYMER PARTICLES, AND COATING OR TREATMENT COMPOSITIONS

摘要

The present invention relates to an aqueous polymer dispersion, which includes hard-core, soft-shell structured particles, with the polymer phase of the core P1 having a glass-transition temperature Tg1 of 60 to 120°C, the polymer phase of the shell P2 having a glass-transition temperature Tg2 of -20 to 40°C, the minimum film-formation temperature TMF being 0 to 50°C, with the phase P1 being 15 to 60% of the total weight of P1+P2, the phase P1 including at least one monomer M1 having at least two copolymerisable ethylene unsaturations and at least one ethylene unsaturated monomer M2 having at least one carboxylic anhydride and/or acid function, the phase P2 being 40 to 85% of the total weight of P1+P2, with said phase P2 including at least one monomer M3 selected among the monomers having, in addition to the polymerisable ethylene unsaturation, at least one group selected among acetoacetoxy, diacetone, methylol or alkoxysilane. The invention also relates to protective and/or decorative coating compositions such as paints, varnishes, surface coatings, inks or adhesives and fibre-treatment compositions.