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:
Sep. 20, 2016
Filed:
Aug. 26, 2011
James Charles Bohling, Lansdale, PA (US);
Steven James Broadwater, Warminster, PA (US);
Arnold Stan Brownell, Lansdale, PA (US);
John William Hook, Iii, Warminster, PA (US);
Reginald T. Smart, Horsham, PA (US);
James Charles Bohling, Lansdale, PA (US);
Steven James Broadwater, Warminster, PA (US);
Arnold Stan Brownell, Lansdale, PA (US);
John William Hook, III, Warminster, PA (US);
Reginald T. Smart, Horsham, PA (US);
Rohm and Haas Company, Philadelphia, PA (US);
Abstract
This invention provides a multistage emulsion polymer including, as copolymerized units: from 0.5% to 5%, by weight P-acid monomer, based on the weight of the emulsion polymer; from 0% to 0.05% by weight multiethylenically unsaturated monomer, based on the weight of the emulsion polymer; and at least one second monoethylenically unsaturated monomer; the emulsion polymer having a calculated Tg of from −20° C. to 50° C.; the emulsion polymer is formed by the 'pulsed' addition of 75% to 100% of the P-acid monomer during a stage including from 10% to 50% of the total monomer weight, preferably added during the relatively early stages of the polymerization. A multistage polymer/TiO2 composite particle and an aqueous coating composition including the composite particle are also provided.