Yellow toner, process for producing the tower and image forming method using the toner
AssigneeCanon Kabushiki Kaisha
InventorsTatsuhiko Chiba, Kazuo Yoshinaga, Satoshi Yasuda, Hiroaki Kawakami, Ryoichi Fujita, Shinya Yachi, Koichi Tomiyama
Life of this patent
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Abstract
A yellow toner suitable for electrophotography is formed by dispersing a yellow colorant mixture in a binder resin. The yellow colorant mixture is formed of at least a pigment of formula (1) or (2) below, and a dye of formula (3) below: wherein R1 and R2 independently denote a hydrogen atom, a chlorine atom or —CH3, and R3 denotes wherein R1, R2, R3 and R4 independently denote a hydrogen atom, —COOH, —COOCH3, —CF3, —CONH(C6H4)CONH2, or
Claims71
A particulate yellow toner, comprising:
- at least a binder resin and a yellow colorant,
- wherein the yellow colorant comprises at least a pigment represented by structural formula (1) or structural formula (2) shown below, and a dye represented by structural formula (3) shown below:
- wherein R1 and R2 independently denote a hydrogen atom, a chlorine atom or —CH3, and R3 denotes
- wherein R1, R2, R3 and R4 independently denote a hydrogen atom, —COOH, —COOCH3, —CF3, —CONH(C6H4)CONH2, or
A process for producing a yellow toner, comprising the steps of:
- dispersing a monomer composition comprising at least a polymerizable monomer, a pigment represented by structural formula (1) or structural formula (2) shown below, and a dye represented by structural formula (3) shown below in an aqueous dispersion medium to form particles of the composition, and
- polymerizing the polymerizable monomer in the dispersed particles to obtain toner particles:
- wherein R1 and R2 independently denote a hydrogen atom, a chlorine atom or —CH3, and R3 denotes
- wherein R1, R2, R3 and R4 independently denote a hydrogen atom, —COOH, —COOCH3, —CF3, —CONH(C6H4)CONH2,
An image forming method, comprising:
- forming an electrostatic image on an image-bearing member, and developing the electrostatic image with a particulate developer carried on a developer-carrying member,
- wherein the particulate developer comprises a particulate yellow toner comprising:
- at least a binder resin and a yellow colorant, and
- the yellow colorant comprises at least a pigment represented by structural formula (1) or structural formula (2) shown below, and a dye represented by structural formula (3) shown below:
- wherein R1 and R2 independently denote a hydrogen atom, a chlorine atom or —CH3, and R3 denotes
- wherein R1, R2, R3 and R4 independently denote a hydrogen atom, —COOH, —COOCH3, —CF3, —CONH(C6H4)CONH2, or
Dependencies are inferred from the claim text.