Abstract: A toner containing toner particles and an inorganic fine powder; the toner particles containing at least a binder resin, a colorant, a sulfur-containing resin, and a wax; the binder resin containing a hybrid resin component containing a vinyl type polymer unit and a polyester unit, and the sulfur-containing resin being a resin selected from the group consisting of sulfur-containing polymers and sulfur-containing copolymers

Abstract: A toner manufacturing method includes grinding and classification to produce a toner containing a binder resin and a colorant with a weight mean particle size of 5 microns to 12 microns and sharp particle density distribution. The toner has a specific circularity, relationship between cut ratio and weight mean size, and relationship between circularity and weight mean size as disclosed in the specification.

Abstract: A toner contains at least a bonding resin and a coloring agent, and has the following characteristics (i) to (iv):

Abstract: A toner is formed of toner particles each comprising at least a binder resin, a colorant and a wax, and inorganic fine powder. The toner is characterized by (a) containing a sulfur-containing polymer, and (b) showing dielectric loss tangent (tan&dgr;) values at 100 kHz assuming a maximum of 2.5×10−2 to 8×10−2 in a temperature range of 100 to 130° C. Because of the combination of the features (a) and (b), the toner can exhibit a good combination of developing performances and fixing performances.

Abstract: A toner contains at least a binder resin, a colorant, a wax and an aluminum compound, wherein the binder resin has an acid value of 1 to 40 mgKOH/g; the binder resin contains 2% to 50% by weight of tetrahydrofuran (THF) based on the weight of the binder resin; a tetrahydrofuran-soluble matter of the binder resin has a main peak in a molecular weight range of from 2,000 to 30,000 in a chromatogram by gel permeation chromatography (GPC); and the aluminum compound is a specific aluminum compound of substituted or unsubstituted benzilic acid.

Abstract: A toner exhibiting good balance of low-temperature fixability, an anti-offset characteristic and a developing performance in continuous image formation is formed of at least a binder resin, a colorant and a wax. The toner exhibits a dielectric loss tangent showing a maximum of 6.0×10−2 to 10.0×10−2 in a temperature range of 90 to 125° C. The toner provides a DSC curve showing at least one heat-absorption peak or shoulder in a temperature range of 85 to 140° C. on temperature increase according to differential scanning calorimetry (DSC). The binder resin comprises a hybrid resin having a vinyl polymer unit and a polyester unit.

Abstract: A toner containing toner particles and an inorganic fine powder; the toner particles containing at least a binder resin, a colorant, a sulfur-containing resin, and a wax; the binder resin containing a hybrid resin component containing a vinyl type polymer unit and a polyester unit, and the sulfur-containing resin being a resin selected from the group consisting of sulfur-containing polymers and sulfur-containing copolymers

Abstract: A toner having a negative triboelectric chargeability is constituted by at least a binder resin, a colorant and an organic metal compound. The toner is characterized by: (a) the organic metal compound is an organic zirconium compound comprising a coordination or/and a bonding of zirconium and an aromatic compound as a ligand or/and an acid source selected from the group consisting of aromatic diols, aromatic hydroxycarboxylic acids, aromatic monocarboxylic acids, and aromatic polycarboxylic acids, (b) the binder resin is a resin selected from the group consisting of (i) a polyester resin and (ii) a hybrid resin component comprising a polyester unit and a vinyl polymer unit, (c) the binder resin has an acid value of 2-50 mgKOH/g, and (d) the toner contains a TFT (tetrahydrofuran)-soluble content providing a GPC (gel permeation chromatography) chromatogram exhibiting a main peak in a molecular weight range of 3,000-20,000 and including 3-25% of a component having molecular weights of at least 5×105.

Abstract: A toner having a negative triboelectric chargeability is constituted by at least a binder resin, a colorant, a wax and an organic metal compound. The toner is characterized in that: (a) the toner has an acid value of 5-35 mgKOH/g, (b) the binder resin comprises a vinyl polymer, (c) the binder resin in the toner contains a chloroform-insoluble content in an amount of 3-50 wt. %, (d) the toner contains a THF (tetrahydrofuran)-soluble content providing a GPC (gel permeation chromatography) chromatogram exhibiting a main peak in a molecular weight range of 5,000-30,000 and at least one sub-peak and/or shoulder in a molecular weight range of 2.times.10.sup.5 -15.times.10.sup.5 and including 15-70% of a component having molecular weights of 1.times.10.sup.4 -10.times.10.sup.

Abstract: A toner for developing an electrostatic image is composed of toner particles each containing at least a binder resin, a colorant, and a wax. The wax satisfies conditions of:(a) showing a maximum heat-absorption peak in a region of 50-130.degree. C. on temperature increase on a DSC (differential scanning calorimeter) curve, and(b) giving a .sup.13 C-NMR (nuclear magnetic resonance) spectrum showing a total peak area S in a range of 0-50 ppm, a total peak area S1 in a range of 36-42 ppm and a total peak area S2 in a range of 10-17 ppm satisfying:1.0.ltoreq.(S1/S).times.100.ltoreq.10, 1.5.ltoreq.(S2/S).times.100.ltoreq.15, and S1<S2.The wax satisfying the above-conditions has an appropriately branched long-chain structure and provides the toner with a good balance of good low-temperature fixability and anti-hot-temperature offset characteristic.

Abstract: An electrophotographic toner is composed of at least a binder resin, a colorant, and a wax. The binder resin (a) comprises a polyester resin, a vinyl resin and a hybrid resin component comprising a polyester unit and a vinyl polymer unit, (b) has a THF (tetrahydrofuran)-soluble content (W1) of 50-85 wt. % and a THF-insoluble content (W2) of 5-50 wt. %, an ethyl acetate-soluble content (W3) of 40-98 wt. % and an ethyl acetate-insoluble content (W4) of 2-60 wt. %, a chloroform-soluble content (W5) of 55-90 wt. % and a chloroform-insoluble content (W6) of 10-45 wt. %, respectively after 10 hours of Soxhlet extraction with respective solvents, giving a ratio W4/S6 of 1.1-4.0, and contains a THF-soluble content providing a GPC (gel permeation chromatography) chromatogram exhibiting a main peak in a molecular weight range of 4000-9000, including 35.0-65.0% (A1) of a component haing molecular weights in a range of 500 to below 1.times.10.sup.4, 25.0-45.0% (A2) of a component having molecular weights in a range of 1.

Abstract: A toner for developing an electrostatic image is comprised of a binder resin, a colorant and a wax. The toner has the following rheological characteristics: (a) a temperature at which the ratio of a loss elastic modulus to a storage elastic modulus (G"/G'=tan .delta.) comes to be 1.0 is present in a temperature range of from 55.degree. C. to 70.degree. C., with an elastic modulus being 1.5.times.10.sup.8 Pa or below; (b) the ratio of the storage elastic modulus at a temperature of 40.degree. C. (G'.sub.40) to the storage elastic modulus at a temperature of 50.degree. C. (G'.sub.50), G'.sub.40 /G'.sub.50, is from 1.5 to 5.0; (c) the ratio of the storage elastic modulus at a temperature of 50.degree. C. (G'.sub.50) to the storage elastic modulus at a temperature of 60.degree. C. (G'.sub.60), G'.sub.50 /G'.sub.60, is from 3 to 20; (d) the ratio of the storage elastic modulus at a temperature of 70.degree. C. (G'.sub.70) to the storage elastic modulus at a temperature of 100.degree. C. (G'.sub.100), G'.sub.

Abstract: The invention relates to a magnetic developer comprising a magnetic toner containing at least a binder resin, a magnetic material and a hydrocarbon wax,wherein said magnetic toner has such properties that:a DSC curve of the toner measured by the use of a differential scanning calorimeter is characterized in that with an endothermic peak in raising temperature, its onset temperature is 105.degree. C. or below and its peak temperature is in the range of from 100.degree. C. to 120.degree. C., and that with an exothermic peak in dropping temperature its peak temperature is in the range of from 62.degree. C. to 75.degree. C. and its peak intensity ratio is 5.times.10.sup.-3 or more; andsaid magnetic material has such properties that:a residual magnetization 6r is in the range of from 12 emu/g to 30 emu/g and a coercive force Hc is in the range of from 130 oersteds to 300 oersteds in a magnetic field of 10,000 oersteds.

Abstract: A bleaching activiator granulate produced by granulating (A) a bleaching activator selected from alkylcarbonyloxybenzene carboxylic acids, alklcarbonyloxybenzene sulfonic acids and salts thereof, and (B) an .alpha.-olefinsulfonate with (C) a water-soluble binder, which makes it possible to provide bleaching activator granulate having improved solubility and storability.

Abstract: A heat fixable toner comprises a binder resin and a release agent. The binder resin comprises a polyester resin, and the release agent comprises a graft-modified polyolefin. A recording medium containing a toner image of said heat fixable toner is heat-fixed by contacting the recording medium with a heater element through a film interposed therebetween. After the heat-fixing step, the film is peeled from the fixed toner image while the film surface temperature is higher than the endothermic peak temperature of the toner.

Abstract: A developer for developing electrostatic images has a toner and an aggregate of fine particles. The aggregate holds a silicone compound selected from the group consisting of a silicone oil and a silicone varnish, in an amount of from 20% by weight to 90% by weight.

Abstract: A toner for developing an electrostatic image includes: a binder resin, a colorant and a wax. The toner is designed to have (a) a storage modulus at 100.degree. C. (G'.sub.100) of 1.times.10.sup.4 Pa to 5.times.10.sup.4 Pa, and (b) a storage modulus at 60.degree. C. (G'.sub.60) and a storage modulus at 70.degree. C. (G'.sub.70) providing a ratio (G'.sub.60 /G'.sub.70) of at least 30. Because of the rheological properties, the toner shows a good fixability even at a high colorant content and shows an improved fixability immediately after power supply to a fixing device in a cold environment. The binder resin may preferably include a low-modulus component and a high-modulus component. The wax may preferably include a high-melting point wax component and a low-melting point wax component.

Abstract: A toner for developing electrostatic images is prepared from a binder resin, a colorant or magnetic material, and a wax component. The toner is provided with improved low-temperature fixability anti-electrostatic offset characteristic, anti-blocking characteristic and anti-offset characteristic by controlling the thermal characteristic of the wax component so as to provide a DSC (differential scanning colorimeter) curve on temperature increase, showing a minimum onset temperature of heat absorption of at least 50.degree. C. and at least two heat absorption peaks including a largest and a second largest peaks, different from each other in peak temperature by at least 15.degree. C., wherein low-temperature heat absorption peak P.sub.1 of the two peaks shows a half-value width of at most 20.degree. C. and a higher-temperature heat absorption peak P.sub.2 shows a half-value width of at most 20.degree. C., and wherein the peak P.sub.1 shows a higher half-width temperature and the peak P.sub.

Abstract: A heat fixable toner comprises a binder resin and a release agent. The binder resin comprises a polyester resin, and the release agent comprises a graft-modified polyolefin.

Abstract: A magnetic developer including magnetic toner particles is formed from a magnetic material containing silicon preferably in an amount of 0.1-1.0 wt. % calculated as SiO.sub.2 and aluminum preferably in an amount of 0.1-1.0 wt. % calculated as Al.sub.2 O.sub.3, respectively based on the magnetic material. The magnetic developer thus produced has both a large triboelectric charge and a sharp distribution of triboelectric charge and is suitable for developing digital latent images by a reversal development scheme. The magnetic developer also has appropriate levels of residual magnetization and coercive force, and characters printed therewith are suitable for magnetic ink character recognition.