Cross-linked polymeric microgel prepared from polymerizing epoxy-containing monomer in the presence of an acid
AssigneePPG Industries, Inc.
InventorsKurt G. Olson, Suryya K. Das, Rostyslaw Dowbenko
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Abstract
A process for preparing polymeric microgel by aqueous dispersion polymerization techniques is disclosed. The emulsion can be inverted into organic diluent, and the water removed to form a dispersion of the microgel in the organic diluent. The microgel can be formulated into coating compositions where it improves the sag resistance and metallic pigment pattern control of the coating composition.
Claims7
A process for preparing emulsions of crosslinked polymeric particles comprising polymerizing a mixture of polymerizable ethylenically unsaturated monomers which contain greater than 2 percent by weight of a 1,2-epoxy group-containing ethylenically unsaturated monomer, the percentage by weight being based on total weight of polymerizable ethylenically unsaturated monomers, via aqueous emulsion polymerization techniques in the presence of acid having a pKa of -10 to 4 and in which the aqueous medium has a pH of less than 2.5, the 1,2-epoxy group-containing ethylenically unsaturated monomer and acid being present in amounts sufficient to form crosslinked polymeric particles.
Dependencies are inferred from the claim text.