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US 12,461,462 B2Granted
White toner, electrostatic charge image developer, and toner cartridge
AssigneeFUJIFILM Business Innovation Corp.
InventorsAsafumi Fujita, Teppei Yawada, Kotaro Yoshihara, Tsuyoshi Murakami
Life of this patent
Estimating the term…
Abstract
A white toner includes a toner particle that contains a binder resin containing a hybrid resin in which an amorphous resin unit and a crystalline polyester resin unit are chemically bonded to each other, surface-treated titanium oxide, and a release agent, in which a proportion of Al atoms in a surface of the surface-treated titanium oxide is 3 atomic % or greater and 20 atomic % or less, and a proportion of Ti atoms in the surface is 5 atomic % or greater and 15 atomic % or less.
Claims13
A white toner comprising:
- a toner particle that contains a binder resin containing a hybrid resin in which an amorphous resin unit and a crystalline polyester resin unit are chemically bonded to each other, surface-treated titanium oxide, and a release agent,
- wherein a proportion of Al atoms in a surface of the surface-treated titanium oxide is 3 atomic % or greater and 20 atomic % or less, and a proportion of Ti atoms in the surface is 5 atomic % or greater and 15 atomic % or less,
- wherein a ratio (Al/Ti) of an atomic weight of Al to an atomic weight of Ti in the surface of the surface-treated titanium oxide is 1.5 or greater and 4.0 or less.
Dependencies are inferred from the claim text.