Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2005-04-19
2005-04-19
Choi, Ling-Sui (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S328500, C526S346000, C526S340000, C526S219600, C526S317100
Reexamination Certificate
active
06881805
ABSTRACT:
The present invention is directed to a dispersion of polymer particles in a dispersing medium. The polymer particles each contain an average of more than two living radicals that are not chemically protected. The present invention is also directed to a free radical precipitation process involving combining at least one monomer in at least one solvent; dispersing said monomer solvent mixture in a dispersing medium that is non-miscible with the first solvent, using a surfactant, stabilizer or mixture thereof; initiating polymerization with at least one free-radical generating agent and conversion, to produce polymer particles containing radicals trapped by precipitation by virtue of being above the lower critical solution temperature of the system; and removing the precipitating agent either during or after free-radical generation to form a dispersion polymer in the dispersing medium having living, trapped radicals.
REFERENCES:
patent: 5173551 (1992-12-01), Caneba
Caneba et al., “Low VOC latex pants from a precipitation polymerization process”, Clean Prod. Processes, 3, 55-59(2001).*
Parker, H.Y., Westmoreland, D.G, and Chang, H.R., “ESR Study of MMA Batch Emulsion Polymerization in Real Time: Effects of Particle Size”, Macromolecules 1996, 29, p. 5119-5127.
Gerard T. Caneba, Bo Wang, “Low VOC latex paints from a Precipitation Polymerization Process”, Clean Prod Processes 3 (2001) 55-59 © Springer-Vrlag, 2001.
Gerard T. Caneba, “Free-Radical Retrograde-Precipitation Polymerization Process”, Advances in Polymer Technology, vol. 11 No. 4 pp. 278-286, 1990.
Anuj Aggarwal, Rahul Saxena, Bo Wang, and Gerard T. Caneba; Studies of the Polymerization of Methacrylic Acid via Free-Radical Retrograde Precipitation Polymerization Process, Journal of Applied Polymer Science, vol. 62, 2039-2051 (1996).
Dar Yadunandan L.
Schlom Peter J.
Xiao Chaodong
Almer Charles W.
Choi Ling-Sui
National Starch and Chemical Investment Holding Corporation
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