Patent ID: 6765072
Filing Date: 2004-07-20
Classification: A01N,A61K,C04B,C08F,C08J,C08L,C09D,C09J

Abstract:
A process for preparing an aqueous dispersion of latex particles having a heterogeneous morphology by a semicontinuous emulsion polymerization comprising:forming a surfactant, or protective colloid; and forming an emulsion polymer by a semicontinuous process from a monomer mixture, using said surfactant, or protective colloid, wherein said monomer mixture comprises: 10 to 70 percent by weight of at least one nonionic, ethylenically unsaturated monomer whose homopolymer has a Tg above 30Â° C.; and 5 to 30 percent by weight of at least one hydrophillic, ethylenically unsaturated monomer, wherein the nonionic, ethylenically unsaturated monomer and the at least one hydrophillic, ethylenically unsaturated monomer are simultaneously added to the dispersion, and wherein the latex particles have good storage stability and water resistance and have raspberry and/or domain structures.