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: 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.

Abstract: The nonmagnetic toner for forming full color images of the present invention comprises:a binder resin, a colorant and wax dispersed in the binder resin as wax particles;wherein the wax particles contained in the toner have a particle size distribution in which the wax particles having a particle size of 3 .mu.m or more are less than 3% by number, the wax particles having a particle size ranging from 2 .mu.m to less than 3 .mu.m are less than 12% by number, the wax particles having a particle size ranging from 1 .mu.m to less than 2 .mu.m are 5% to 30% by number, and the wax particles having a particle size of less than 1 .mu.m are 55% to 95% by number.

Abstract: A nonmagnetic monocomponent negatively chargeable color developer which has excellent light transmittancy for overhead projection transparencies, excellent transfer characteristics, charging characteristics, and durability is provided. The nonmagnetic monocomponent negatively chargeable color developer contains color toner particles that contain a chromatic color colorant, binder resin, and charge control agent, and an exterior additive added to the exterior of said toner particles. The binder resin is a linear polyester resin having a softening point of about 100.degree. to about 120.degree. C., the sum of the acid value and the hydroxyl value is about 20 to about 40 KOH mg/g, and the weight-average molecular weight/number-average molecular weight ratio is less than about 10. The charge controller is a boron compound having the general structural formula (A) below: ##STR1## wherein R.sub.1 and R.sub.8 is a substituted or nonsubstituted aryl groups; R.sub.2 and R.sub.

Abstract: A developer contains a set of color toners and black toner for use in a full color image forming apparatus. Each of the color toners contains a color colorant and a first binder resin, and the black toner contains a black colorant and a second binder resin. The difference between softening point and flow starting temperature of said first binder resin is less than the difference between softening point and flow starting temperature of said second binder resin.

Abstract: The present invention relates to A yellow developer comprising:a non-magnetic toner particle containing colorant, binder resin and wax, the colorant being a compound classified into C. I. pigment yellow 180, the binder resin having an acid value of 1 to 30 KOH mg/g, and the wax having an acid value of 0.5 to 30 KOH mg/g.

Abstract: The present invention relates to a developer comprising toner to which laminated titanium oxide is externally added.

Abstract: A toner for full-color development for use in a developing system of a full-color image forming apparatus which comprises a binder resin having a glass transition point Tg of from 60.degree. to 75.degree. C., a number-average molecular weight Mn of from 3500 to 6000, a ratio of a weight-average molecular weight Mw to the number-average molecular weight Mn (Mw/Mn) ranging from 3 to 8, and a difference between a temperature T.sub.1 at the apparent melt viscosity of 1.times.10.sup.5 poise and a temperature T.sub.2 at the apparent melt viscosity of 1.times.10.sup.6 poise DT (=T.sub.1 -t.sub.2) in the range of from 8.degree. to 15.degree. C.

Abstract: A negatively chargeable color toner for full-color image forming, comprising a specific linear polyester resin and C. I. Solvent Yellow 162 or a specific anthraquinone magenta dye or an anthraquinone magenta dye together with a quinacridone magenta pigment.