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:
Oct. 03, 2017
Filed:
May. 17, 2016
Rohm and Haas Company, Philadelphia, PA (US);
James C. Bohling, Lansdale, PA (US);
David G. Kelly, Ambler, PA (US);
Pu Luo, King Of Prussia, PA (US);
Yogesh Tiwary, Bangalore, IN;
Rohm and Haas Company, Philadelphia, PA (US);
Abstract
The present invention relates to a process for preparing an aqueous dispersion of polymer encapsulated TiOparticles, comprising a multistage polymerization steps that includes a relatively large amount of low Tfirst monomers and a relatively small amount of high Tsecond monomers that comprise a relatively high concentration of an acid monomer. The dispersion of encapsulated TiOparticles shows significantly improved freeze-thaw stability as compared with prior art processes that do not include staging with the second monomers described herein.