The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 06, 2021
Filed:
Jul. 15, 2019
Rohm and Haas Company, Collegeville, PA (US);
Jonathan DeRocher, Coopersburg, PA (US);
Andrew Hejl, Lansdale, PA (US);
Jessica Levin, Philadelphia, PA (US);
John J. Rabasco, Collegeville, PA (US);
Antony K. Van Dyk, Blue Bell, PA (US);
Kimy Yeung, Phoenixville, PA (US);
Rohm and Haas Company, Collegeville, PA (US);
Abstract
The present invention relates to a process for preparing an aqueous dispersion of neutralized multistage polymer particles comprising the steps of contacting under emulsion polymerization conditions a) an aqueous dispersion of first polymer particles with b) first monomers to form an aqueous dispersion of 2-stage polymer particles; then contacting under emulsion polymerization conditions the aqueous dispersion of 2-stage polymer particles with second monomers comprising to form an unneutralized aqueous dispersion of 3-stage polymer particles; then neutralizing the unneutralized aqueous dispersion of 3-stage polymer particles with a base to form an aqueous dispersion of neutralized 3-stage polymer particles, wherein the first and second monomers form a shell having a calculated Tof less than 50° C. The process of the present invention is useful in preparing a composition that is useful as an open time additive in coatings formulations.