Rohm and Haas Company

Antony Keith VanDyk

Dennis Paul Lorah

Ralph Craig Even

Ann Robertson Hermes

Wayne Devonport

Joseph David Tanzer

Colorants, dispersants, and dispersions are provided which include PNPs having a mean diameter in the range of from 1 to 50 nanometers, an acid value in the range of from 0 to 700 mg KOH/g PNP solids, an amine value in the range of from 0 to 250, a hydroxyl number in the range of from 0 to 250 mg KOH/g PNP solids, and containing at least 2 wt % of a polarizable group. Also provided are methods for preparing colorants, dispersants, and dispersions, which include PNPs.

Colorants, dispersants and dispersions containing polymeric nanoparticles

An aqueous composition including an aqueous dispersion of polymeric nanoparticles having a mean diameter of from 1 to 50 nanometers, the particles including, as polymerized units, at least one multi-ethylenically-unsaturated monomer and at least one ethylenically unsaturated water soluble monomer is discloseded. Certain embodiments of the composition include pigment particles and other polymer particles. The aqueous compositions include aqueous coating compositions.

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Blue Bell, PA, United States of America

Antony Keith VanDyk