ALEXANDRIA, Va., Aug. 25 -- United States Patent no. 12,715,999, issued on Aug. 25, was assigned to Rohm and Haas Co. (Collegeville, Pa.).
"Aqueous dispersion of opacifying pigment particles" was invented by Qing Zhang (Collegeville, Pa.), Andrew J. Swartz (Fleetwood, Pa.) and Michael W. Leonard (Collegeville, Pa.).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a waterborne composition comprising an aqueous dispersion of first and second multistage polymer particles, wherein each of the first and second polymer particles comprises a water-occluded core and a high Tg polymeric shell wherein the second multistage polymer particles further comprise a polymeric binder layer superp...