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:
Mar. 18, 2008
Filed:
Dec. 27, 2004
Lei Zheng, Apex, NC (US);
John Thomas Lean, Akron, OH (US);
Eric Sean Castner, Uniontown, OH (US);
Thierry Florent Edme Materne, Lasne, BE;
Dane Kenton Parker, Massillon, OH (US);
Frank James Feher, Copley, OH (US);
Lei Zheng, Apex, NC (US);
John Thomas Lean, Akron, OH (US);
Eric Sean Castner, Uniontown, OH (US);
Thierry Florent Edme Materne, Lasne, BE;
Dane Kenton Parker, Massillon, OH (US);
Frank James Feher, Copley, OH (US);
The Goodyear Tire & Rubber Company, Akron, OH (US);
Abstract
The present invention discloses a process for producing a core-shell polymer that comprises: (1) preparing a monomer solution which is comprised of (a) at least one monomer, optional one crosslinking monomer (b) a conjugate acid of a surfactant with a pKa of less than 14, and (c) a controlled free radical polymerization agent; (2) preparing an aqueous medium which is comprised of (a) water, and (b) a conjugate base of a weak acid wherein the pKb of the base is less than 14; and (3) mixing the monomer solution with the aqueous medium under conditions that result in the in-situ formation of an emulsifier to produce a polymerization medium, and (4) initiating free radical polymerization within the polymerization medium to produce a core polymer, wherein the core contains a free radical control agents, (5) adding a second monomer to the polymerization medium containing the core polymer, and (6) allowing polymerization to proceed in the presence of the free radical control agent to produce the core-shell polymer.