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US 12,189,334 B2Granted
Electrostatic charge image developing toner and electrostatic charge image developer
AssigneeFUJIFILM Business Innovation Corp.
InventorsSatoshi Miura, Yoshimasa Fujihara, Atsushi Sugawara, Shintaro Anno, Daisuke Noguchi
Life of this patent
Estimating the term…
Abstract
An electrostatic charge image developing toner includes a toner particle that contains a binder resin having an acid value of 5 mgKOH/g or more and 25 mgKOH/g or less, and a pigment having an isoindoline skeleton, in which a total Net intensity NA of an alkali metal and an alkaline earth metal, which is measured by fluorescent X-ray analysis, in the toner particle is 1.50 kcps or more and 4.00 kcps or less.
Claims17
An electrostatic charge image developing toner comprising:
- a toner particle that contains a binder resin having an acid value of 5 mgKOH/g or more and 25 mgKOH/g or less, and a colorant, wherein the colorant comprises a pigment having an isoindoline skeleton,
- wherein a total Net intensity NA of an alkali metal and an alkaline earth metal, which is measured by fluorescent X-ray analysis, in the toner particle is 1.50 kcps or more and 4.00 kcps or less, wherein a proportion of the pigment having an isoindoline skeleton in the colorant in the toner is 50% by mass or more and 100% by mass or less,
- wherein the toner particle contains an amorphous resin and a crystalline resin as the binder resin, and
- in a case where a cross section of the toner particle is observed, at least two domains of crystalline resins satisfy Condition (A), Condition (B1), Condition (C), and Condition (D),
- Condition (A):
- an aspect ratio of the domain of the crystalline resin is 5 or more and 40 or less;
- Condition (B1):
- a major axis length of the domain of the crystalline resin is 0.5 μm or more and 1.5 μm or less;
- Condition (C):
- an angle between an extension line of the major axis of the domain of the crystalline resin and a tangent line at a contact point where the extension line is in contact with a surface of the toner particle is 60 degrees or more and 90 degrees or less;
- and
- Condition (D):
- a crossing angle between extension lines of the major axes in two domains of the crystalline resins is 45 degrees or more and 90 degrees or less.
10 more elements
An electrostatic charge image developing toner comprising:
- a toner particle that contains a binder resin having an acid value of 5 mgKOH/g or more and 25 mgKOH/g or less, and a colorant, wherein the colorant comprises a pigment having an isoindoline skeleton,
- wherein a total Net intensity NA of an alkali metal and an alkaline earth metal, which is measured by fluorescent X-ray analysis, in the toner particle is 1.50 kcps or more and 4.00 kcps or less, wherein a proportion of the pigment having an isoindoline skeleton in the colorant in the toner is 50% by mass or more and 100% by mass or less,
- wherein the toner particle contains an amorphous resin and a crystalline resin as the binder resin, and
- in a case where a cross section of the toner particle is observed, at least two domains of crystalline resins satisfy Condition (A), Condition (B2), Condition (C), and Condition (D),
- Condition (A):
- an aspect ratio of the domain of the crystalline resin is 5 or more and 40 or less;
- Condition (B2):
- a ratio of a major axis length of the domain of the crystalline resin to a maximum diameter of the toner particle in at least one of the two domain of the crystalline resins is 10% or more and 30% or less;
- Condition (C):
- an angle between an extension line of the major axis of the domain of the crystalline resin and a tangent line at a contact point where the extension line is in contact with a surface of the toner particle is 60 degrees or more and 90 degrees or less;
- and
- Condition (D):
- a crossing angle between extension lines of the major axes in two domains of the crystalline resins is 45 degrees or more and 90 degrees or less.
10 more elements
Dependencies are inferred from the claim text.