Toner
AssigneeCanon Kabushiki Kaisha
InventorsTOHRU HIRAMATSU, SHOHEI SHIBAHARA, YUU SASANO, HIROKI KAGAWA
Life of this patent
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Abstract
Provided is a toner that includes a toner particle containing a binder resin; and an external additive, wherein the binder resin contains a polyester resin A; when a content of the polyester resin A in the binder resin is taken as Wp (mass %), Wp is 50 mass % or more; when a content ratio of the monomer unit Uiso corresponding to isophthalic acid to all monomer units corresponding to polycarboxylic acids in the polyester resin A is taken as MIPA (mol %), MIPA is 40 mol % or more; the external additive contains inorganic fine powder; and the inorganic fine powder contains a silica fine particle having aluminum hydroxide on the surface thereof.
Claims13
A toner comprising:
- a toner particle comprising a binder resin;
- and an external additive, wherein
- the binder resin comprises a polyester resin A;
- when a content of the polyester resin A in the binder resin is taken as Wp (mass %), Wp is 50 mass % or more;
- the polyester resin A is a copolymer of a polycarboxylic acid and a polyol;
- the polycarboxylic acid comprises an isophthalic acid;
- when a content ratio of a monomer unit Uiso corresponding to the isophthalic acid with respect to all monomer units corresponding to the polycarboxylic acid in the polyester resin A is taken as MIPA (mol %), MIPA is 40 mol % or more;
- the external additive comprises an inorganic fine powder;
- and
- the inorganic fine powder comprises a silica fine particle having aluminum hydroxide on a surface thereof.
Dependencies are inferred from the claim text.