Coating processes – Particles – flakes – or granules coated or encapsulated – Solid encapsulation process utilizing an emulsion or...
Reexamination Certificate
2004-12-27
2008-03-18
Haider, Saira B. (Department: 1796)
Coating processes
Particles, flakes, or granules coated or encapsulated
Solid encapsulation process utilizing an emulsion or...
C264S004100
Reexamination Certificate
active
07344752
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.
REFERENCES:
patent: 4814373 (1989-03-01), Frankel et al.
patent: 5395891 (1995-03-01), Obrecht et al.
patent: 6127488 (2000-10-01), Obrecht et al.
patent: 6133364 (2000-10-01), Obrecht et al.
patent: 6207757 (2001-03-01), Obrecht et al.
patent: 6242526 (2001-06-01), Siddiqui et al.
patent: 6242534 (2001-06-01), Obrecht et al.
patent: 6248419 (2001-06-01), Kennedy et al.
patent: 6353065 (2002-03-01), Charleux et al.
patent: 6489378 (2002-12-01), Sosa et al.
patent: 6653404 (2003-11-01), Konno et al.
patent: 6747095 (2004-06-01), Konno et al.
patent: 6777500 (2004-08-01), Lean et al.
patent: 2004/0127634 (2004-07-01), Parker et al.
patent: 2005/0282957 (2005-12-01), Parker et al.
U.S. Appl. No. 60/552,617, Zheng et al., filed Mar. 12, 2004.
U.S. Appl. No. 10/721,718, Parket et al., filed Nov. 25, 2002.
Ferguson et al, Polymer magazine, vol. 43, Issue 24 (Nov. 2002), pp. 6371-6382.
Smulders and Monteiro, Macromolecules, 37, 4474-4483 (2004).
Prokopov and Gritskova (Russ. Chem. Rev2001, 70, 791).
Castner Eric Sean
Edme Materne Thierry Florent
Feher Frank James
Lean John Thomas
Parker Dane Kenton
Haider Saira B.
Rockhill Alvin T.
The Goodyear Tire & Rubber Company
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