Patent classifications
G03G9/1133
METHOD FOR PRODUCING RECYCLED CARRIER, METHOD FOR PRODUCING RECYCLED ELECTROSTATIC CHARGE IMAGE DEVELOPER, IMAGE FORMING METHOD, AND RECYCLED CARRIER
A method for producing a recycled carrier includes: performing classification, the classification including separating a carrier having a coating layer from a collected developer by a centrifugal air classifier, the collected developer containing the carrier and being obtained by collecting an electrostatic charge image developer remaining after image formation; and performing recoating, the recoating including dissolving or thermally melting a coating resin of the separated and classified carrier and then coating the resulting carrier again to produce a recycled carrier.
TONER AND METHOD FOR MANUFACTURING TONER
A toner is provided, which is obtained by heat treating a toner particle containing a crystalline polyester resin, an amorphous polyester resin, a hydrocarbon wax and a wax dispersant, wherein the crystalline polyester resin is a hybrid resin having crystalline polyester segments and amorphous vinyl segments, and a mass ratio of crystalline polyester segments and amorphous vinyl segments in the crystalline polyester resin (crystalline segments/amorphous segments) is 70/30 to 98/2.
CARRIER FOR DEVELOPING ELECTROSTATIC LATENT IMAGES, TWO-COMPONENT DEVELOPER, IMAGE FORMING APPARATUS, TONER STORING UNIT, AND SUPPLEMENTAL DEVELOPER
A carrier for developing electrostatic latent images is provided. The carrier includes a magnetic core particle and a resin layer coating a surface of the magnetic core particle. The resin layer includes a particulate material A having a volume average particle diameter (a) and a particulate material B having a volume average particle diameter (b). The volume average particle diameter (a) of the particulate material A is the largest among volume average particle diameters of all particulate materials included in the resin layer, and an inequation 100≧(a)/(b)≧5 is satisfied. The particulate material A is barium sulfate.
Magnetic carrier and two-component developer
A magnetic carrier is provided which can suppress a decrease in glossiness even in a long term use for POD which requires high glossiness. A magnetic carrier includes a filled core particle in which a silicone resin is filled in pores of a porous magnetic core particle and a vinyl resin coating a surface of the filled core particle. In a pore distribution of the porous magnetic core particle measured by a mercury intrusion method, a cumulative pore volume in a pore diameter range of 0.1 to 3.0 μm is 35.0 to 95.0 mm.sup.3/g, and in a pore distribution of the filled core particle measured by a mercury intrusion method, a cumulative pore volume in a pore diameter range of 0.1 to 3.0 μm is 3.0 to 15.0 mm.sup.3/g. The magnetic carrier includes 1.2 to 3.0 parts by mass of the vinyl resin to 100.0 parts by mass of the filled core particle.
ELECTROSTATIC CHARGE IMAGE DEVELOPING CARRIER, METHOD OF PREPARING ELECTROSTATIC CHARGE IMAGE DEVELOPING CARRIER, AND ELECTROSTATIC CHARGE IMAGE DEVELOPER
An electrostatic charge image developing carrier includes magnetic particles and a resin coating layer which covers the magnetic particles, wherein a sulfate ion concentration of the resin coating layer is 0.05% by weight or less with respect to a total weight of the resin coating layer, and when a total value of a molar amount of sulfate ions contained and a molar amount of sulfo groups contained per 1 g of the resin coating layer is A mol and a molar amount of sodium ions contained per 1 g of the resin coating layer is B mol, a relationship of 0.1<B/A<1.2 is satisfied.
MAGNETIC CARRIER, TWO-COMPONENT DEVELOPER, AND REPLENISHMENT DEVELOPER
A magnetic carrier includes a magnetic core and a coating resin that covers a surface of the magnetic core. The coating resin includes a resin A and a resin B. A content of the resin A is 1 to 50% by mass, and a content of the resin B is 50 to 99% by mass, with respect to the coating resin. The resin A has a particular unit Y1 and a particular unit Y2, and the resin B contains 0.1% by mass or less of the particular unit Y2. When a mass of the resin A is represented by X, a mass of the unit Y1 is represented by Ma, and a mass of the unit Y2 is represented by Mb, 0.90≤(Ma+Mb)/X≤1.00 and 1.00≤Ma/Mb≤30.0 are satisfied, and also 0≤|SPa−SPb|≤2.0 is satisfied.
MAGNETIC CARRIER, TWO-COMPONENT DEVELOPER, AND DEVELOPER FOR REPLENISHMENT
A magnetic carrier including a magnetic core and a coating resin configured to coat the surface of the magnetic core. The coating resin contains a graft resin A and a graft resin B. The coating resin (i) contains 1.0 mass % or more and 50.0 mass % or less of the graft resin A, and (ii) contains 50.0 mass % or more and 99.0 mass % or less of the graft resin B. The graft resin A has a unit Y1 represented by formula (1) and a unit Y2 represented by formula (2). The graft resin B (i) is a comb-shaped polymer having, as a branch, at least one moiety selected from, for example, a styrene-based polymer moiety and a (meth)acrylate-based polymer moiety, and (ii) contains the polysiloxane structure moiety at a content of 0.1 mass % or less.
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MAGNETIC CARRIER, TWO-COMPONENT DEVELOPER, AND REPLENISHMENT DEVELOPER
A magnetic carrier including: a magnetic core; and a coating resin that coats a surface of the magnetic core, wherein the resin coating layer has a thickness of 50 nm or more, a coating resin, which forms the resin coating layer, contains a resin S having an organosilicon polymer moiety, and when a surface and a position at a depth of 20 nm from the surface of the magnetic carrier are analyzed by X-ray photoelectron spectroscopy, an amount of silicon element as determined by the analysis has a ratio within a specific range at respective positions.
TWO COMPONENT DEVELOPER CONTAINING TONER AND MAGNETIC CARRIER, AND METHOD FOR PRODUCING TWO COMPONENT DEVELOPER
A two component developer comprising a toner and a specific magnetic carrier, wherein a toner particle in the toner comprises a surface layer comprising an organosilicon polymer, electrical conductivity of a filtrate obtained by filtering off the toner using a specific procedure is 1.0 to 2.5 μS/cm, and when dC (atomic %) denotes carbon concentration, dO (atomic %) denotes oxygen concentration and dSi (atomic %) denotes silicon concentration, as measured by ESCA, at the surface of the toner particle, then the dC, the dO and the dSi satisfy the following formulae:
40.0≤dC/(dC+dO+dSi)×100≤60.0
10.0≤dSi/(dC+dO+dSi)×100≤26.0.
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 (μm) of the inorganic particles and the thickness T (μm) of the coating resin layer satisfy the following relational expression (1): 0.007≤D/T≤0.24.