Patent classifications
G03G9/083
MAGNETIC TONER
A magnetic toner includes toner particles. The toner particles each include a toner mother particle and an external additive attached to a surface of the toner mother particle. The toner mother particles contain a binder resin and a magnetic powder. The external additive includes resin particles as external additive particles. The resin particles have a blocking rate of no greater than 40% by mass. The resin particles have a number average primary particle diameter of at least 40 nm and no greater than 120 nm. A resin constituting the resin particles is a vinyl resin including repeating units represented by general formulas (1) and (2), and a repeating unit derived from a sulfo group-containing vinyl compound. The content of the repeating unit derived from the sulfo group-containing vinyl compound in the vinyl resin is at least 0.1 mol % and no greater than 3.5 mol %
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MAGNETIC TONER
A magnetic toner includes toner particles. The toner particles each include a toner mother particle and an external additive attached to a surface of the toner mother particle. The toner mother particles contain a binder resin and a magnetic powder. The external additive includes resin particles as external additive particles. The resin particles have a blocking rate of no greater than 40% by mass. The resin particles have a number average primary particle diameter of at least 40 nm and no greater than 120 nm. A resin constituting the resin particles is a vinyl resin including repeating units represented by general formulas (1) and (2), and a repeating unit derived from a sulfo group-containing vinyl compound. The content of the repeating unit derived from the sulfo group-containing vinyl compound in the vinyl resin is at least 0.1 mol % and no greater than 3.5 mol %
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CARRIER FOR ELECTROSTATIC IMAGE DEVELOPMENT, ELECTROSTATIC IMAGE DEVELOPER, AND PROCESS CARTRIDGE
A carrier for electrostatic image development includes: a core material; and a coating resin layer that contains inorganic particles and covers the core material. The content of the inorganic particles is 10% by mass or more and 60% by mass or less based on the total mass of the coating resin layer. The volume average diameter D (m) of the inorganic particles and the thickness T (m) of the coating resin layer satisfy the following relational expression (1): 0.007D/T0.24.
TONER
A magnetic toner comprising a toner particle, the toner particle comprising a magnetic body, a crystalline resin A, and an amorphous resin B. The crystalline resin A has a monomer unit (a). The amorphous resin B has a monomer unit (b). A content of the crystalline resin A in the toner is 6.2 to 77.0 mass %. The sum of contents of the crystalline resin A and the amorphous resin B in the toner is 30.0 mass % or more. A content of the monomer unit (a) in the crystalline resin A is 50.0 to 100.0 mass %. Using SPA [(J/cm.sup.3).sup.0.5] for a SP value of the crystalline resin A and using SPB [(J/cm.sup.3).sup.0.5] for a SP value of the amorphous resin B, SPA and SPB satisfy 0.15SPBSPA2.00.
IMAGE FORMING METHOD
Provided is an image forming method for arranging powder particles on a resin image layer, wherein the powder particles are non-spherical powder particles; the image forming method containing the step of adjusting an orientation of the powder particles disposed on the resin image layer; and hd1 and hd2 are adjusted so as to satisfy a relation expressed by the following Equation (1), Equation (1): hd1<hd2, wherein hd1 and hd2 each are respectively a half-value width of a reflected light distributions before and after the step of adjusting the orientation of the powder particles.
TONER
A toner including a toner particle including a binder resin and a crystalline material, wherein in powder dynamic viscoelasticity measurement of the toner, where an onset temperature of a storage elastic modulus E obtained when a temperature is raised at 20 C./min is denoted by T(A) C., and an onset temperature of a storage elastic modulus E obtained when a temperature is raised at 5 C./min is denoted by T(B) C., T(A)T(B) is 3.0 C. or less, in DSC of the toner, a peak temperature of a maximum endothermic peak is from 50.0 C. to 90.0 C., and an amount of a tetrahydrofuran-insoluble component in the binder resin is from 15% by mass to 60% by mass.
TONER
A toner including a toner particle including a binder resin and a crystalline material, wherein in powder dynamic viscoelasticity measurement of the toner, where an onset temperature of a storage elastic modulus E obtained when a temperature is raised at 20 C./min is denoted by T(A) C., and an onset temperature of a storage elastic modulus E obtained when a temperature is raised at 5 C./min is denoted by T(B) C., T(A)T(B) is 3.0 C. or less, in DSC of the toner, a peak temperature of a maximum endothermic peak is from 50.0 C. to 90.0 C., and an amount of a tetrahydrofuran-insoluble component in the binder resin is from 15% by mass to 60% by mass.
Magnetic toner
A magnetic toner comprising a magnetic toner particle including a binder resin, a magnetic body and a crystalline polyester, wherein a storage elastic modulus E(40) [Pa] at 40 C. and a storage elastic modulus E(85) [Pa] at 85 C., which are obtained in a powder dynamic viscoelasticity measurement of the magnetic toner, satisfy the following formulas (1) to (3).
E(40)6.010.sup.9(1)
E(85)5.510.sup.9(2)
[E(40)E(85)]100/E(40)40(3)
TONER
A toner includes toner particles. The toner particles each include a toner mother particle. The toner mother particles contain a binder resin and a magnetic powder. The binder resin includes a polyester resin, a vinyl resin, and a block polymer. The block polymer includes a polyester portion, a vinyl polymer portion, and a linker that links the polyester portion and the vinyl polymer portion. The linker is derived from a specific compound having a vinyl group and at least one of a carboxy group and an alcoholic hydroxyl group. The magnetic powder has an octahedral structure.
Magnetic toner
A magnetic toner comprising a magnetic toner particle including a binder resin, a magnetic body and a crystalline polyester, wherein the dielectric loss tangent at 100 kHz is 1.010.sup.2 or more, a variation coefficient CV3 of an occupied area ratio of the magnetic body when a cross section of the magnetic toner particle is divided by a square grid having a side of 0.8 m in cross-sectional observation of the magnetic toner particle using a transmission electron microscope TEM is from 30.0% to 80.0%, and where a storage elastic modulus of the magnetic toner at 40 C. is taken as E(40) [Pa] and a storage elastic modulus of the magnetic toner at 85 C. is taken as E(85) [Pa], the following formulas (1) and (2) are satisfied:
E(85)5.510.sup.9(1)
[E(40)E(85)]100/E(40)30(2).