Toner
AssigneeCanon Kabushiki Kaisha
InventorsKosuke Fukudome, Kenta Kamikura, Kozue Uratani, Tetsuya Kinumatsu, Yuta Komiya
Life of this patent
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Abstract
A toner comprising a toner particle comprising a binder resin and an ester compound, wherein: the binder resin comprises a resin A comprising a specific amount of a long-chain acrylate unit and a styrene-based monomer unit, and a resin B comprising a specific monomer unit in a specific amount; the ester compound has an alkyl chain with a specific chain length, a content of the resin A in the chloroform-soluble portion of the toner particles is 60% by mass or more; and using SPm (J/cm3)1/2 for a SP value of the long-chain acrylate unit and using SPw (J/cm3)1/2 for a SP value of the ester compound, SPm is 18.00 to 19.00, and SPm and SPw satisfy formula (a). |SPm−SPw|≤1.50 (a)
Claims8
A toner, comprising:
- a toner particle comprising a binder resin and an ester compound;
- the binder resin comprising a resin A and a resin B;
- resin A comprising at least one member selected from the group consisting of a sulfide group and disulfide group, and comprising monomer units represented by formulae (1) and (2)
- where R1 represents a hydrogen atom or methyl group, R2 represents a straight-chain alkyl group having 12 carbon atoms, and R21 represents a hydrogen atom or methyl group;
- resin B comprising monomer units represented by formulae (3) and (4)
- where R31 represents a hydrogen atom or methyl group, R32 represents an optionally halogen-substituted straight-chain or branched C1-3 alkylene group, R33 to R35 independently represent a benzyl group, phenethyl group, or straight-chain, branched or cyclic C1-6 alkyl group, X represents a counteranion, and R22 represents a hydrogen atom or methyl group;
- the ester compound being at least one compound selected from the group consisting of compounds represented by formulae (5), (6) and (7)
- where R36 and R41 independently represent alkylene groups having 2 to 8 carbon atoms, and R37, R38, R42, R43, R51 and R52 independently represent a straight-chain alkyl group having 14 to 24 carbon atoms, wherein
- the toner has an average circularity of 0.97 to 0.99,
- a content of the resin A in a chloroform-soluble matter of the toner particle is at least 60 mass %,
- a content of the monomer unit represented by formula (1) in resin A is 2.0 to 15.0 mass %,
- a content of the monomer unit represented by formula (2) in resin A is at least 48.0 mass %,
- a content of the monomer unit represented by formula (4) in resin B is at least 48.0 mass %,
- SPm is 18.00 to 19.00, and
- |SPm−SPw|≤1.50
- when SPm (J/cm3)1/2 is an SP value of the monomer unit represented by formula (1) and SPw (J/cm3)1/2 is an SP value of the ester compound, and
- an average number of domains of the ester compound present in a toner cross section observed using a scanning transmission electron microscope is at least 250, and r1 is not greater than 1.00 μm when r1 (μm) is an average long diameter of the domains.
Dependencies are inferred from the claim text.