Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Reexamination Certificate
2008-01-30
2011-11-29
Chapman, Mark (Department: 1721)
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
C430S108220, C430S137150
Reexamination Certificate
active
08067140
ABSTRACT:
A toner for developing electrostatic image which has a reduced residual amount of a decomposed product of a polymerization initiator remaining in the toner upon production (mainly an ether component) and an unreacted polymerizable monomer (mainly styrene), less odor produced upon fixing so as to avoid deteriorating surrounding environment, an excellent shelf stability at high temperature upon storing or anti-blocking property, and an excellent printing durability under both N/N environment and H/H environment upon printing is provided. A toner for developing electrostatic image comprising a colored resin particle which is obtained by polymerizing a polymerizable monomer composition containing a polymerizable monomer, a colorant and a charge control resin in an aqueous dispersion medium in the presence of a polymerization initiator, wherein the charge control resin is a quaternary ammonium base containing copolymer having a glass transition temperature “Tg” in the range from 70 to 100° C.; the polymerization initiator is an organic peroxide; and each residual amount of an ether component and styrene remaining in the toner for developing electrostatic image is respectively less than 500 ppm and less than 50 ppm.
REFERENCES:
patent: 6887637 (2005-05-01), Niwa
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Japanese Office Action dated Apr. 19, 2011, issued in corresponding Japanese Patent Application No. 2007-022493.
Chapman Mark
Westerman Hattori Daniels & Adrian LLP
Zeon Corporation
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