Abstract: The present invention provides a toner-set comprising yellow toner, magenta toner, cyan toner and black toner, in which the black toner comprises black toner particles comprising at least a binder resin and a black pigment and having a standard deviation of degree of roundness of not more than 0.045; the yellow toner comprises yellow toner particles comprising at least a binder resin and a yellow pigment and having a standard deviation of degree of roundness of not more than 0.045 and an average degree of roundness larger than that of the black toner particles, the magenta toner comprises magenta toner particles comprising at least a binder resin and a magenta pigment and having a standard deviation of degree of roundness of not more than 0.045 and an average degree of roundness larger than that of the black toner particles, and the cyan toner comprises cyan toner particles comprising at least a binder resin and a cyan pigment and having a standard deviation of degree of roundness of not more than 0.

Abstract: The present invention provides a toner for developing an electrostatic image which has relatively high roundness and uniform shape as well as excellent rising property of electrification, electrification stability, maintenance of heat resistance, fixability, image quality and productivity, said toner being effective for full-color image formation, cleanerless system and toner-recycling system.

Abstract: The present invention relates to a mono-component developing device, which develops an electrostatic latent image formed on an electrostatic latent image-supporting member with a toner having a weight-average particle size of from 4 to 10 &mgr;m, a compression rate of not more than 32% and an angle of repose of not more than 38°, and a toner used for the mono-component developing device. Even in the case when a comparatively great stress is imposed on the toner particles, the toner of the present invention maintains superior fluidity and makes it possible to provide a high-quality image.

Abstract: A production method of toner particles has steps of mixing a binder resin and a colorant, melting and kneading the mixture, pulverizing the kneaded material, and classifying the pulverized materials to give a colored resin particles. Then the colored resin particles are mixed with silica particles having an average primary particle size of 16 to 28 nm with the number of particles (A) that are less than 15 nm in particle size, the number of particles (B) that are between 15 and 30 nm in particle size and the number of particles (C) that are larger than 30 nm in particle size having the relation of (B)/(A)>4 and (B)/(C)>4. To obtain toner particles, the resultant mixture is heat-treated to make the colored resin particles spherical and to make the silica particles fixed on the surface of the colored resin particles.

Abstract: A developing system is provided for forming a full-color image, which includes

Abstract: The present invention provides a toner-set comprising yellow toner, magenta toner, cyan toner and black toner, in which

Abstract: The present invention related to a toner used in a toner-jetting system wherein the toner is jettingly adhered to a recording medium in a direct manner, the toner having a specific aerated bulk density, a specific distribution of a particle size and/or a specific mean roundness.

Abstract: The present invention related to a toner used in a toner-jetting system wherein the toner is jettingly adhered to a recording medium in a direct manner, the toner having a specific cohesion degree, a specific distribution of a particle size and/or a specific mean roundness.

Abstract: The present invention provides a toner-set comprising yellow toner, magenta toner, cyan toner and black toner, in which the black toner comprises black toner particles comprising at least a binder resin and a black pigment and having a standard deviation of degree of roundness of not more than 0.045; the yellow toner comprises yellow toner particles comprising at least a binder resin and a yellow pigment and having a standard deviation of degree of roundness of not more than 0.045 and an average degree of roundness larger than that of the black toner particles, the magenta toner comprises magenta toner particles comprising at least a binder resin and a magenta pigment and having a standard deviation of degree of roundness of not more than 0.045 and an average degree of roundness larger than that of the black toner particles, and the cyan toner comprises cyan toner particles comprising at least a binder resin and a cyan pigment and having a standard deviation of degree of roundness of not more than 0.

Abstract: The present invention relates to a negatively chargeable toner comprising fine toner particles which contain a thermoplastic resin, a colorant, and a specified compound; the toner externally admixed with inorganic fine particles which have been treated with a hydrophobicizer and a silane coupling agent having a cationic group and/or a silicone oil having a cationic group, and which have a blow-off charge quantity (Q) of −800<Q<0 &mgr;C/g relative to iron oxide particles.

Abstract: The present invention relates to a non-magnetic toner for developing electrostatic latent images, having; an average degree of roundness of not less than 0.960, a standard deviation of degree of roundness of not more than 0.040, a value of D/d50 of not less than 0.40, in which D=6/(&rgr;·S) (&rgr; is a true density of toner (g/cm3), and S is a BET specific surface area of toner (m2/g)); d50 is an average weight particle size of toner, and an adhesive stress of 6 g/cm2 or less under a compression of 1 kg/cm2. The non-magnetic toner for developing electrostatic latent images provides high-quality images not only in low-speed areas, but also in high-speed areas, and has a superior transferring properties.

Abstract: The present invention related to a toner used in a toner-jetting system wherein the toner is jettingly adhered to a recording medium in a direct manner, the toner having a specific angle of repose, a specific mean roundness and/or a specific distribution of a particle size.

Abstract: The present invention relates to a non-magnetic yellow toner for use in full-color image forming apparatuses, such as full-color electrostatic copying machines and full-color laser beam printers, comprising:non-magnetic toner particles containing a binder resin having an acid value of 1 to 30 KOHmg/g, and a coloring material composed of a compound classified as C. I. pigment yellow 180;the toner particles having a roundness of 0.94 to 1.0, a standard roundness deviation of not more than 0.045, and a volume mean particle size of 2 to 9 .mu.m.

Abstract: The present invention relates to developer comprising a toner and/or a carrier;the toner comprising:toner particles comprising colored resin-particles containing at least a binder resin and a colorant, and inorganic fine particles fixed on the surface of the colored resin-particles,the toner particles having an average degree of roundness of not less than 0.960 and a standard deviation of degree of roundness of not more than 0.040;and carrier having an average degree of roundness of not less than 0.940 and a standard deviation of degree of roundness of not more than 0.055.

Abstract: The present invention provides a mono-component developing method comprising the steps of: supplying a mono-component developer containing a toner particles having an average shape factor (SF value) of 100 to 150 to a developer transporting member;regulating the developer on the developer transporting member by a regulating member to form a thin developer-layer on the transporting member;transporting the thin developer-layer by the transporting member to develop an electrostatic latent image; andafter development, making a residual developer on the developer-transporting member in contact with a static erasing member applied with a voltage having a polarity opposite to a charging polarity of the toner particles,and also provides a mono-component developing machine for effectuate the above method.

Abstract: A mono-component developing method, comprising the steps of:supplying a mono-component developing agent containing a toner onto a developer-supporting member that is aligned face to face with an image-supporting member;regulating the developing agent on the developer-supporting member by a regulating member installed in contact with the developer-supporting member; anddeveloping an electrostatic latent image formed on the image-supporting member by the toner,wherein the toner has a weight-average particle size (d.sub.50) in the range of 4 to 10 .mu.m, an average degree of roundness of not less than 0.950 and a standard deviation of degree of roundness of not more than 0.040, and more preferably the toner has a specific value of a surface shape characteristic D/d.sub.50, and a specific ratio d.sub.50 /Ra of the toner weight-average particle size (d.sub.50) to the surface roughness (Ra) of the developer-supporting member.

Abstract: The present invention relates to a non-magnetic toner for developing electrostatic latent images, having;an average degree of roundness of not less than 0.960,a standard deviation of degree of roundness of not more than 0.040,a value of D/d.sub.50 of not less than 0.40, in which D=6/(.rho..multidot.S) (.rho. is a true density of toner (g/cm.sup.3), and S is a BET specific surface area of toner (m.sup.2 /g)); d.sub.50 is an average weight particle size of toner, andan adhesive stress of 6 g/cm.sup.2 or less under a compression of 1 kg/cm.sup.2. The non-magnetic toner for developing electrostatic latent images provides high-quality images not only in low-speed areas, but also in high-speed areas, and has a superior transferring properties.

Abstract: The present invention provides a toner, comprising;toner particles containing at least a binder resin and a colorant, and having an average degree of roundness from 0.960 to 1.0 and a standard deviation of degree of roundness of not more than 0.040; andsilica particles having an average primary particle size of 16 to 28 nm, in which the number of particles (A) that are less than 15 nm in particle size, the number of particles (B) that are between 15 and 30 nm in particle size and the number of particles (C) that are larger than 30 nm is in relation of B/A>4 and B/C>4.

Abstract: The present invention relates to a negatively chargeable developing agent for mono-component development comprising;toner particles containing a binder resin and a colorant; andinorganic fine particles which are treated with a hydrophobicizing agent and a surface treating agent having a cationic group, the inorganic fine particles externally added to the toner particles and having a blow-off charge quantity (Q) -800<Q<0 .mu.C/g relative to iron oxide particles, the negatively chargeable developing agent being suitable for use in a mono-component developing device and image-forming apparatus.

Abstract: 1. A non-magnetic mono-component developer comprising:toner particles containing at least a binder resin and a coloring agent and having a volume mean particle size D of 4 to 10 .mu.m;first inorganic fine particles having a mean primary particle size of 1 to 40 nm, the quantity of addition of the first inorganic fine particles being 0.1 to 2% by weight relative to the quantity of the toner particles;second inorganic fine particles having a mean primary particle size of 40 to 100 nm and not less than 10 nm larger than the first inorganic fine particles, the quantity of addition of the second inorganic fine particles being 0.1 to 2.5% by weight relative to the quantity of the toner particles, the total quantity of addition of the first and second inorganic fine particles being 0.