IN SITU PREPARATION OF A BIMORPHOLOGICAL LATEX

摘要

The present invention relates to an in situ method for preparing a bimorphological aqueous dispersion of first polymer particles with protuberating phosphorus acid cores and second polymer particles without protuberating cores. The method provides a more efficient way of making compositions for pigmented coating formulations.

主权项

1. An in situ method for preparing a bimorphological aqueous dispersion of polymer particles comprising the steps of:
a) mixing together an aqueous dispersion of phosphorus acid-functionalized acrylic-based first seed polymer particles having a volume average particle size in the range of from 40 nm to 85 nm with an aqueous dispersion of acrylic-based second seed polymer particles comprising a substantial absence of phosphorus acid functionality and having a volume average particle size in the range of from 20 nm to 80 nm; b) contacting monomers with the aqueous dispersions of the first and second seed polymer particles under emulsion polymerization conditions to form a dispersion of 1) polymer particles with a protuberating phosphorus acid functionalized core; and 2) polymer particles without a protuberating core; and wherein the weight-to-weight ratio of particles with the protuberating phosphorus acid functionalized core to particles without a protuberating core is in the range of 25:75 to 75:25.