Electrophotographic positively charged toner and manufacturing method thereof
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United States of America Patent
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Issued Date -
Apr 7, 2005
app pub date -
Nov 26, 2003
filing date -
Nov 28, 2002
priority date (Note) -
Abandoned
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Abstract
An electrophotographic positively charged toner and method for its manufacture. The toner includes a core toner that has a binder resin, a wax, a colorant and a charge control agent as its principal component materials. The core toner is spherified through heat treatment. The toner also includes at least fine silica particles as an external additive. The charge control agent contains a resin having a quaternary ammonium salt group as a functional group and a nigrosine dye. Even if after kneading, pulverization and classification, the toner is made spherical by melting the surfaces of the particles in a hot air current, the charge control agent is not coated and hence the charging ability thereof is not reduced.
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