Abstract: A toner for electrostatic image development containing a resin binder, a negatively chargeable charge control agent, and a positively chargeable charge control agent, wherein the resin binder contains at least one polyester, wherein a carboxylic acid component of the polyester contains isophthalic acid and/or an ester thereof and fumaric acid and/or an ester thereof, provided that if two or more polyesters are used, the carboxylic acid component is taken as an overall component, and wherein the negatively chargeable charge control agent contains a metal-containing azo dye and/or a metal complex of salicylic acid, and wherein the toner has a softening point of from 90° to 120° C. The toner for electrostatic image development of the present invention can be suitably used in developing latent images formed in, for example, electrophotography, an electrostatic recording method, an electrostatic printing method, or the like.

Abstract: A toner in which mother toner particles containing at least a resin binder and a colorant are coated with an external additive, wherein the mother toner particles contain fine powders of a fluororesin having an average particle size of 1 ?m or less in an amount of from 4 to 10 parts by weight, based on 100 parts by weight of the resin binder, and a toner in which mother toner particles containing at least a resin binder and a colorant are coated with an external additive, wherein the external additive contains fine powders of a fluororesin having an average particle size of 1 ?m or less in an amount of from 0.3 to 2 parts by weight, based on 100 parts by weight of the mother toner particles. The toner of the present invention is suitably used for, for example, developing a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method, or the like.

Abstract: A toner in which mother toner particles containing at least a resin binder and a colorant are coated with an external additive, wherein the mother toner particles contain fine powders of a fluororesin having an average particle size of 1 ?m or less in an amount of from 4 to 10 parts by weight, based on 100 parts by weight of the resin binder, and a toner in which mother toner particles containing at least a resin binder and a colorant are coated with an external additive, wherein the external additive contains fine powders of a fluororesin having an average particle size of 1 ?m or less in an amount of from 0.3 to 2 parts by weight, based on 100 parts by weight of the mother toner particles. The toner of the present invention is suitably used for, for example, developing a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method, or the like.

Abstract: A method of forming fixed images, including the step of applying a two-component developer containing a carrier and a toner containing a wax and a resin binder containing a crystalline polyester to a two-component development device with a linear speed of from 500 to 5,000 mm/sec, to develop the toner, wherein the crystalline polyester is contained in an amount of from 3 to 40% by weight and the wax in an amount of from 2.5 to 10% by weight, of the toner, and wherein the two-component development device comprises at least three magnet rollers which are arranged closely to each other along the perimeter of a photoconductor, wherein one magnet roller arranged on the uppermost side in the rotational direction of the photoconductor rotates in a direction opposite to the rotational direction of the photoconductor at the point therebetween, and the other magnet rollers rotate in the same direction as the photoconductor at the point therebetween.

Abstract: The present invention relates to a crystalline polyester for toner, obtained by a process comprising the step of polymerizing raw material monomers in the presence of a wax, wherein the crystalline polyester has a number-average molecular weight of from 3000 to 10000 and a weight-average molecular weight of from 150000 to 8000000. The toner containing the crystalline polyester of the present invention can be used, for example, for developing electrostatic latent images formed in electrophotography, electrostatic recording method, electrostatic printing method, and the like.

Abstract: A toner for electrostatic image development containing a resin binder, a negatively chargeable charge control agent, and a positively chargeable charge control agent, wherein the resin binder contains at least one polyester, wherein a carboxylic acid component of the polyester contains isophthalic acid and/or an ester thereof and fumaric acid and/or an ester thereof, provided that if two or more polyesters are used, the carboxylic acid component is taken as an overall component, and wherein the negatively chargeable charge control agent contains a metal-containing azo dye and/or a metal complex of salicylic acid, and wherein the toner has a softening point of from 90° to 120° C. The toner for electrostatic image development of the present invention can be suitably used in developing latent images formed in, for example, electrophotography, an electrostatic recording method, an electrostatic printing method, or the like.

Abstract: A friction material for a synchronizer ring comprises (A) a petroleum coke with an ash content of 0.1 mass % to 8 mass % or (B) a pitch coke with an ash content of 0.1 mass % to 8 mass %, more preferably (C) a calcined petroleum coke with an ash content of 0.1 mass % to 1 mass % or (D) a foundry coke with an ash content of 5 mass % to 8 mass %. The friction material is effectively used for a synchronizer ring requiring high coefficient of dynamic friction.

Abstract: A toner in which mother toner particles containing at least a resin binder and a colorant are coated with an external additive, wherein the mother toner particles contain fine powders of a fluororesin having an average particle size of 1 ?m or less in an amount of from 4 to 10 parts by weight, based on 100 parts by weight of the resin binder, and a toner in which mother toner particles containing at least a resin binder and a colorant are coated with an external additive, wherein the external additive contains fine powders of a fluororesin having an average particle size of 1 ?m or less in an amount of from 0.3 to 2 parts by weight, based on 100 parts by weight of the mother toner particles. The toner of the present invention is suitably used for, for example, developing a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method, or the like.

Abstract: A toner comprising a resin binder and a colorant comprising a composite oxide of two or more metals, wherein the composite oxide has a BET specific surface area of 0.5 to 7 m2/g and a saturation magnetization of from 1 to 40 Am2/kg; and a two-component developer comprising the above toner and a carrier having a saturation magnetization of from 40 to 100 Am2/kg. The toner can be used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.

Abstract: A toner comprising a resin binder, a black colorant comprising a composite oxide of two or more metals, and a charge control agent comprising a quaternary ammonium salt. The toner is suitably used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.

Abstract: A friction material for a synchronizer ring comprises (A) a petroleum coke with an ash content of 0.1 mass % to 8 mass % or (B) a pitch coke with an ash content of 0.1 mass % to 8 mass %, more preferably (C) a calcined petroleum coke with an ash content of 0.1 mass % to 1 mass % or (D) a foundry coke with an ash content of 5 mass % to 8 mass %. The friction material is effectively used for a synchronizer ring requiring high coefficient of dynamic friction.

Abstract: A method of forming fixed images, including the step of applying a two-component developer containing a carrier and a toner containing a wax and a resin binder containing a crystalline polyester to a two-component development device with a linear speed of from 500 to 5,000 mm/sec, to develop the toner, wherein the crystalline polyester is contained in an amount of from 3 to 40% by weight and the wax in an amount of from 2.5 to 10% by weight, of the toner, and wherein the two-component development device comprises at least three magnet rollers which are arranged closely to each other along the perimeter of a photoconductor, wherein one magnet roller arranged on the uppermost side in the rotational direction of the photoconductor rotates in a direction opposite to the rotational direction of the photoconductor at the point therebetween, and the other magnet rollers rotate in the same direction as the photoconductor at the point therebetween.

Abstract: A toner comprising a resin binder and a colorant comprising a composite oxide of two or more metals, wherein the composite oxide has a BET specific surface area of 0.5 to 7 m2/g and a saturation magnetization of from 1 to 40 Am2/kg; and a two-component developer comprising the above toner and a carrier having a saturation magnetization of from 40 to 100 Am2/kg. The toner can be used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.

Abstract: The present invention relates to a crystalline polyester for toner, obtained by a process comprising the step of polymerizing raw material monomers in the presence of a wax, wherein the crystalline polyester has a number-average molecular weight of from 3000 to 10000 and a weight-average molecular weight of from 150000 to 8000000. The toner containing the crystalline polyester of the present invention can be used, for example, for developing electrostatic latent images formed in electrophotography, electrostatic recording method, electrostatic printing method, and the like.

Abstract: A toner for development of electrostatic latent images, comprising a resin binder comprising a resin having a softening point of from 120° to 170° C., a glass transition point of from 58° to 75° C., and a percentage of chloroform-insoluble component of from 5 to 50% by weight; and a resin having a softening point of 90° C. or more and less than 120° C., a glass transition point of from 58° to 75° C., and a percentage of chloroform-insoluble component of less than 5% by weight; and at least one low-melting point wax having a melting point of from 60° to 90° C. The toner for development of electrostatic latent images has low lowest fixing temperature and is excellent in the offset resistance, the blocking resistance and the durability.

Abstract: A toner for electrostatic image development, containing a resin binder; and a colorant containing a charcoal powder, wherein the charcoal powder has a volume-based median particle size (D50) of 5.6 &mgr;m or less, and a coefficient of variation of 80% or less; a two-component developer containing the toner and a carrier; and a process for development of a two-component developer, including the step of applying the two-component developer to a developing device for two-component development. The toner can be suitably used for, for instance, the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.

Abstract: A toner for development of electrostatic latent images, comprising a resin binder comprising a resin having a softening point of from 120° to 170° C., a glass transition point of from 58° to 75° C., and a percentage of chloroform-insoluble component of from 5 to 50% by weight; and a resin having a softening point of 90° C. or more and less than 120° C., a glass transition point of from 58° to 75° C., and a percentage of chloroform-insoluble component of less than 5% by weight; and at least one low-melting point wax having a melting point of from 60° to 90° C. The toner for development of electrostatic latent images has low lowest fixing temperature and is excellent in the offset resistance, the blocking resistance and the durability.

Abstract: A toner comprising a resin binder and a colorant comprising a composite oxide of two or more metals, wherein the composite oxide has a BET specific surface area of 0.5 to 7 m2/g and a saturation magnetization of from 1 to 40 Am2/kg; and a two-component developer comprising the above toner and a carrier having a saturation magnetization of from 40 to 100 Am2/kg. The toner can be used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.

Abstract: A positively chargeable toner for two-component development comprising a resin binder; a colorant; a releasing agent comprising a wax having a melting point of 50° to 120° C.; and an external additive comprising a positively chargeable silica, the positively chargeable silica having an absolute deviation of an error of 0.1 or less, against an approximate straight line showing an adhesion state of silicon atoms to carbon atoms, and a free ratio of 5% or less, wherein the positively chargeable toner is usable together with a ferrite carrier having a saturation magnetization of from 40 to 100 Am2/kg. This positively chargeable toner is used for development of an electrostatic latent image formed in electrophotography, electrostatic recording method, electrostatic printing method, or the like.

Abstract: A toner comprising a resin binder, a black colorant comprising a composite oxide of two or more metals, and a charge control agent comprising a quaternary ammonium salt. The toner is suitably used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.