149results about "Developers" patented technology

To provide a toner that achieves both low-temperature fixation and storage stability in high-temperature environments. [Solution] A toner containing a graft polymer resin including a polyolefin resin and a styrene-based resin, a polyester resin, and a release agent, wherein when the toner heated to 50°C is measured by FTIR-ATR (total internal reflection absorption infrared spectroscopy), the peak intensity derived from the release agent is set to Wk-50 and the peak intensity derived from the polyester resin is set to RK-50; when the toner heated to 70°C is measured by FTIR-ATR, the peak intensity derived from the release agent is set to Wk-70 and the peak intensity derived from the polyester resin is set to RK-70; and when the toner heated to 90°C is measured by FTIR-ATR, the peak intensity derived from the release agent is set to Wk-90 and the peak intensity derived from the polyester resin is set to RK-90, the toner satisfies the following formulas (1) and (2). (Wk-70 / RK-70) / (Wk-50 / RK-50)≦1.1···(1) 1.5≦(Wk-90 / RK-90) / (Wk-50 / RK-50) (2)

This invention relates to a method for manufacturing a dry-process toner that can achieve both glossiness and resistance to hot offset. [Solution] A method for producing a dry-process toner containing amorphous polyester resin A, wherein the amorphous polyester resin A is a polycondensate of an alcohol component, a carboxylic acid component, and polyethylene terephthalate, and the method comprises the steps of: melt-kneading a mixture containing the amorphous polyester resin A using an open-roll twin-screw kneader; crushing and classifying the resulting kneaded material to obtain toner matrix particles; and mixing the obtained toner matrix particles with an external additive.

A toner comprising a toner particle comprising a binder resin, a crystalline material, and a silica particle, wherein a number average particle diameter D1 of the silica particle comprised in the toner particle is 400 to 3000 nm; the silica particle has a pointed portion; and the crystalline material comprises a compound having an ester group.

To provide printing systems including multilayer films that achieve proper wetting and anchoring of ink compositions without requiring additional primer layer or corona or plasma treatments.SOLUTION: The present invention relates to printing systems and methods that may include an ink composition including electrically charged ink particles dispersed in a hydrocarbon liquid and a multilayer film. The multilayer film may include a polymeric core layer; and one or more printing layers adjacent to the polymeric core layer. The one or more printing layers may include at least 50 wt.% of an ethylene vinyl acetate copolymer having acid and acrylate functional groups. The ethylene vinyl acetate copolymer having acid and acrylate functional groups may include from 0.5 wt.% to 4 wt.% methacrylic or acrylic acid; from 0.5 wt.% to 4 wt.% acrylate, from 7 wt.% to 40 wt.% vinyl acetate; and the balance ethylene, based on the total weight of the ethylene vinyl acetate copolymer having acid and acrylate functional groups.SELECTED DRAWING: None

To provide a powder container capable of preventing powder from adhering to an inner surface of the powder container and facilitating removal of the powder.SOLUTION: A powder container for storing powder has an inner surface in which a surface roughness Sz of is between 0.1 μm and 3.0 μm.SELECTED DRAWING: Figure 1

Magnetic carrier include a carrier core and a resin coat layer that coats the surface of the carrier core, and can electrostatically charge toner positively by friction. The resin coat layer contains polyimide silicone resin and silica particles.

An electrostatic charge image developer contains a toner including toner particles that contain a binder resin and a carrier including magnetic particles and a resin layer that adheres to a surface of the magnetic particles, in which, in a dynamic viscoelasticity measurement of the toner, in a case where a loss tangent tanδ at a temperature of 90° C. and a strain of 1% is represented by D1 (90), a loss tangent tanδ at a temperature of 90° C. and a strain of 50% is represented by D50 (90), a loss tangent tanδ at a temperature of 150° C. and a strain of 1% is represented by D1 (150), and a loss tangent tanδ at a temperature of 150° C. and a strain of 50% is represented by D50 (150), each of D1 (90), D50 (90), D1 (150), and D50 (150) is 0.5 or more and 2.5 or less, a value of D50 (150)−D1 (150) is less than 1.5, and a value of D50 (90)−D1 (90) is less than 1.0, and in the surface of the magnetic particles, an average unevenness interval Sm and an arithmetic mean roughness Ra satisfy 0.5 μm≤ Sm≤2.5 μm and 0.3 μm≤ Ra≤1.2 μm.

The present invention provides a magnetic one-component toner that has low-temperature fixing properties and excellent heat resistance and heat stress resistance over long periods, as well as an image forming apparatus using the same. [Solution] The magnetic one-component toner comprises toner matrix particles containing at least a binder resin and magnetic powder, and an external additive attached to the surface of the toner matrix particles. The binder resin comprises an amorphous polyester resin and a crystalline polyester resin containing an aliphatic diol with 3 to 9 carbon atoms, and the amount of crystalline polyester resin added is 5% by mass or less relative to the amorphous polyester resin. When the glass transition point at the first heating, measured by differential scanning calorimeter, is Tg1, and the glass transition point measured when the temperature is raised again after cooling after measuring Tg1 is Tg2, Tg(45) and Tg(25), which are Tg1 measured after being left at 45°C and 25°C for 100 hours, are 0

A toner contains toner particles that contains a polyester resin, an aromatic petroleum resin, and a release agent, wherein cross sections of the toner particles observed with a scanning electron microscope have domains of the release agent that satisfy the following requirements (i) and (ii):(i) the average number of the domains present per toner particle is 2 to 8; and(ii) each of the domains has a long diameter of at least 400 nm and an aspect ratio of at most 0.7 as calculated by Formula 1:Aspect ratio=(short diameter of domain) / (long diameter of domain)  Formula 1.

To provide a toner for electrostatic charge image development that reduces the difference in glossiness between a fixed image in a low temperature and low pressure condition and a fixed image in a high temperature and high pressure condition, while allowing acquisition of good fixability.SOLUTION: A toner for electrostatic charge image development includes toner particles containing a binder resin. In dynamic viscoelasticity measurement, when the loss tangent tanδ at a temperature of 90°C and a strain amount of 1% is defined as D1(90), the loss tangent tanδ at a temperature of 90°C and a strain amount of 50% as D50(90), the loss tangent tanδ at a temperature of 150°C and a strain amount of 1% as D1(150), and the loss tangent tanδ at a temperature of 150°C and a strain amount of 50% as D50(150), D1(90), D50(90), D1(150), and D50(150) are each 0.5 or more and 2.5 or less, the value of D50(150)-D1(150) is less than 1.5, and the value of D50(90)-D1(90) is less than 1.0. The toner particles further contain resin particles. The number average molecular weight of a THF soluble matter in the toner particles is 5000 or more and 15000 or less.SELECTED DRAWING: None

To provide a toner composition for electrostatic image development that does not contain titanium dioxide, exhibits excellent image density, charge amount, and charge stability, and is less prone to blotting during printing. [Solution] A toner composition for developing electrostatic images, comprising toner particles and an external additive, wherein the external additive comprises first silica particles, second silica particles, and third silica particles, the first silica particles being surface-treated with aluminum hydroxide and fatty acids, the content of the first silica particles being 1.0 to 1.5% by mass relative to the toner particles, the second silica particles being formed by a sol-gel method with an average particle diameter of 70 to 90 nm, the content of the second silica particles being 0.8 to 2.5% by mass relative to the toner particles, and the third silica particles having an average particle diameter of less than 10 nm.

To provide a toner for electrostatic image development that offers excellent resistance to hot offset and durability. [Solution] A toner for developing electrostatic images, comprising toner particles containing a binder resin and a release agent, The amorphous composite resin A comprises a polyester resin segment which is a polycondensate of an alcohol component and a carboxylic acid component, and a polymethacrylate ester resin segment which is an addition polymer of raw material monomers containing a methacrylate ester. A toner for developing electrostatic images, wherein the release agent contains ester wax.

A toner comprising a toner particle and an external additive, wherein the external additive comprises a silica particle and a hydrotalcite particle containing fluorine which is present in cross sections of the hydrotalcite particle, wherein, when a content of the hydrotalcite particle containing the fluorine and a content of the silica particle to 100 parts by mass of the toner particle are defined as Wh and Ws respectively, Wh and Ws are in specific ranges, and a sum of areas of peaks which are present in a range of −140 to 100 ppm of a chemical shift of the silica particle obtained by a solid-state 29Si-NMR DD / MAS method is defined as S, the area of the peak of a D unit and Q unit are defined as D and Q respectively, the Wh, the Ws, S, the D, and the Q satisfy a specific relationship.

To provide a developing device that can prevent scattering of toner, minimize maintenance, and obtain stable image quality for a long period.SOLUTION: A developing device causes two-component developer to be adsorbed on a surface of a rotating developing sleeve by using a magnetic force to form a magnetic brush, causes the magnetic brush to rub an electrostatic latent image carrier, and develops an electrostatic latent image formed on a surface of the electrostatic latent image carrier to form a toner image. The developing device comprises a case that accommodates the two-component developer and the developing sleeve, and an air filter. The air filter has a thickness of 2-20 mm and a density gradient in which the pressure drop at a wind speed of 10 cm / s is 2-40 Pa, forms an air current sucked into the case from the gap between the developing sleeve and the case, and forms an air current exhausted from inside the case through the air filter. The two-component developer accommodated in the case includes two-component developer composed of magnetic particles each having a surface coated by a resin layer. The resin layer includes at least one or more types of electrified particles.SELECTED DRAWING: Figure 1

A toner comprises a toner particle and silica fine particles, wherein, fragment ions of a D unit structure are observed in time-of-flight secondary ion mass spectrometry measurement of the silica fine particles, in a titration operation of the silica fine particles using NaOH, the titer is within a specific range, an area of a peak from −25 to −15 ppm in 29Si-NMR measurement of the silica fine particles is denoted by D, the sum of the areas of peaks from −140 to 100 ppm is denoted by S, and an area of a peak from more than −19 ppm to −17 ppm or less is denoted by D1, the specific surface area of the silica fine particles, D, D1, and S satisfy specific relationships, and a specific amount of a specific polyvalent metal element is present on the surface of the toner particle.

A toner comprising a binder resin and a near-infrared light absorbing material is provided. The toner in the form of a pellet has: a chroma C* of 20 or less in the L*C*h color space; a hue angle h of from 50 to 90 degrees in the L*C*h color space; and a spectral reflectance of 5% or less at a wavelength of from 800 to 900 nm.

This invention provides an electrophotographic apparatus that features a toner containing strontium titanate as an external additive and a highly durable electrophotographic photoreceptor, resulting in excellent transfer performance even in low-temperature, low-humidity environments. [Solution] An electrophotographic apparatus is provided, comprising: an electrophotographic photoreceptor having a surface layer containing resin X as a binder resin; charging means for charging the surface of the electrophotographic photoreceptor; exposure means for irradiating the charged surface of the electrophotographic photoreceptor with light to form an electrostatic latent image; developing means for supplying toner to the electrostatic latent image to form a toner image; and transfer means for transferring the toner image to a transfer medium, wherein the toner contains strontium titanate as an external additive, and the resin X contains a specific structural unit.

Provided is a toner including a binder resin, a release agent, and a charge-controlling agent, wherein the toner includes toner particles having particle diameters of 3 micrometers or smaller, among the toner particles having particle diameters of 3 micrometers or smaller, a proportion of the toner particles having an average circularity of 0.70 or greater but 0.85 or less in all of the toner particles is 10% by number or greater but less than 20% by number and a proportion of the toner particles having an average circularity of less than 0.70 in all of the toner particles is 10% by number or less.

Disclosed is an image forming apparatus that includes a photosensitive member, a rotary including a storage frame provided with a toner storage portion and an inlet opening communicating, a developing roller, and a supply roller, and a toner cartridge. In a case where a region that is surrounded by an outer peripheral surface of the developing roller, the outer peripheral surface of the supply roller, and a common tangent between the outer peripheral surface of the developing roller and the outer peripheral surface of the supply roller and that is positioned downstream of a contact portion in a rotational direction of the supply roller, in a state in which the rotary is in a developing posture, a downstream region is positioned below the inlet opening and overlaps with the inlet opening at least partially, as viewed in a vertical direction.

To prevent the occurrence of an increase in torque due to insufficient supply of metal soap to a surface of a photoreceptor.SOLUTION: An image forming apparatus comprises: a photoconductor drum 1; an electrifying roller 2; a developing roller 4; a cleaning blade 8; a toner storage unit 3b; and a control unit 202 that controls a metal soap application operation of applying, with the developing roller 4, metal soap stored in the toner storage unit 3b to a surface of the photoconductor drum 1. When performing the metal soap application operation, the control unit 202 performs control so that the moving speed of the surface of the photoconductor drum 1 becomes larger than the moving speed of the surface of the photoconductor drum 1 when performing an image forming operation.SELECTED DRAWING: Figure 2

To provide an electrostatic charge image developing toner which suppresses fogging in a low-temperature, low-humidity environment.SOLUTION: An electrostatic charge image developing toner is provided, comprising toner base particles containing a binder resin and colorant, and an external additive containing silica particles A charged with a polarity opposite that of the toner base particles, the silica particles A having a shape index of 2.0 or greater as expressed as a ratio of a number average particle diameter to a BET equivalent particle diameter.SELECTED DRAWING: None

This suppresses image defects caused by toner being reverse-transferred to the photoreceptor. [Solution] The image forming apparatus comprises a photoreceptor, a charging member, a developing unit, a transfer unit, a recovery member disposed downstream of the transfer unit and upstream of the charging member, which electrostatically recovers the reverse transfer toner having a first color transferred from the transfer member to the surface of the photoreceptor by the transfer unit, and a control unit that controls the voltage applied to the charging member and the recovery member, respectively. When the absolute value of the potential of the recovery member during image formation is V1 and the absolute value of the surface potential of the photoreceptor before passing through the recovery member is V2, the control unit controls V2

To provide an electrostatic charge image developing toner which offers high initial image density and suppresses image blur in a high-temperature, high-humidity environment, and to provide a method of manufacturing the same.SOLUTION: An electrostatic charge image developing toner and a method of manufacturing the same are provided, the electrostatic charge image developing toner comprising toner base particles containing a binder resin and colorant and having a circularity in a range of 0.950 to 0.995, inclusive, and an external additive containing silica particles A and silica particles B having different number average particle diameters, where the silica particles A have a greater number average particle diameter than the silica particles B, a BET specific surface area in a range of 70 m2 / g to 150 m2 / g, inclusive, and a shape index of 2.0 or greater as expressed as a ratio of the number average particle diameter to a BET equivalent particle diameter, and the silica particles B have a shape index of less than 2.0.SELECTED DRAWING: None

To provide a toner that has reduced the occurrence of drop-off and streaks even after a long-term printing in a high temperature and high humidity environment.SOLUTION: A toner contains a toner particle containing a polyester resin and silica fine particles. In measurement in time-of-flight secondary ion mass spectroscopy of the silica fine particles, fragment ions corresponding to the D-unit structure are observed. When the silica fine particles are dispersed in a mixed solution of ethanol and a NaCl solution and a titration operation using sodium hydroxide is performed, a titration amount falls within a specific range. In solid 29Si-NMR measurement of the silica fine particles, when the area of a peak where a peak top is present within a range from -25 to -15 ppm is defined as D, and the area of a peak where a peak top is present within a range exceeding -19 ppm and -17 ppm or less is defined as D1, the specific surface area of the silica fine particles, D, and D1 are present in a specific relationship. The polyester resin is present on the surface of the toner particle.SELECTED DRAWING: None