A toner comprising a toner particle comprising an organic pigment and a binder resin, wherein, in a solid-state NMR measurement at 60° C. using a solid fraction obtained by specific procedure for dissolving the toner in chloroform as a sample, a transverse relaxation time T2 of a peak observed between 1.5 and 2.5 ppm is from 0.08 to 0.13 ms.

To provide a charge control agent and a toner having a superior charging characteristic. A charge control agent containing a bis-phthalimide derivative represented by formula. Thus, it is possible to provide a safe, negative chargeability charge control agent with which the rate of rise of the charge can be increased, and which has a high charging amount and poses no problem in terms of waste regulations. Furthermore, it is possible to provide a negatively chargeable toner (and particularly, a negatively chargeable polymerized toner) for electrostatic image development which uses this charging control agent and has a superior charging characteristic.

A toner comprises a toner particle containing an amorphous polyester, wherein the amorphous polyester contains an amorphous polyester 1, the amorphous polyester contains a tin compound and a titanium compound, a Sn/Ti abundance ratio between Sn and Ti in the amorphous polyester according to x-ray fluorescence analysis is 20/80 to 80/20, and a weight-average molecular weight Mw1 of the amorphous polyester 1 according to measurement by gel permeation chromatography (GPC) is Mw1<7,000.

The present invention is directed to providing a toner having no environmental difference in charging performance, and having high stability of images after output of a large number of copies under environments at high temperature and high humidity in a higher-speed one-component developing system, and a method for producing the toner, and the toner comprises a toner particle including a toner base particle containing a binder resin, a colorant and a releasing agent; and a resin particle adhering to the surface of the toner base particle, wherein the resin particle contains a resin A, and the resin A has an ionic functional group and an acid dissociation constant pKa of 7.0 or more and 9.0 or less, and the resin A has a monovalent group a represented by Formula (1): ##STR00001##

A method for manufacturing a toner including supplying powder particles containing a binder resin via a plurality of powder-particle supplying units to a treating chamber, the treating chamber having a cylindrical inner peripheral surface, heat treating the powder particles in the treating chamber by supplying hot air into the treating chamber, wherein a temperature of the hot air supplied into the treating chamber is 100.0° C. or higher and 200.0° C. or lower, and adjusting a humidity of the hot air so that a relative humidity of the hot air supplied into the treating chamber is 3.0% or more and 80.0% or less.

A toner comprising a toner particle containing a binder resin, a wax, and inorganic fine particles, wherein the binder resin contains a crystalline polyester resin and an amorphous polyester resin, and, in a cross section of the toner particle, when Sc represents an area taken up by the crystalline polyester resin and S1 represents an area taken up by the inorganic fine particles that are present in the crystalline polyester resin portion, Sc and S1 satisfy the relationship S1/Sc≧0.2.

A toner is provided. The toner comprises toner base particles, resin particles adhered to surfaces of the toner base particles, and an external additive adhered to the surfaces of the toner base particles. The toner base particles each comprising a binder resin, a colorant, and a wax. The toner has a storage elastic modulus G′ of 4.0×10.sup.5 or less at 70° C. An embedment degree of the external additive is from 15% to 40%, as the embedment degree is measured by stirring 10 g of the toner and 20 g of a carrier in a 50-mL vial at 67 Hz for 60 minutes using a rocking mill.

An electrophotographic toner which is excellent in grindability, fixing property and durability by being obtained via a step of melt-kneading a mixture containing an amorphous bioplastic having a weight-average molecular weight (Mw) of 55000 to 120000, a terpene phenol resin, and a styrene acrylic resin having a weight-average molecular weight (Mw) of 85500 to 118000 so as to obtain a kneaded mixture, and a step of grinding the kneaded mixture after hardening.

A toner composition comprising (a) a first lower molecular weight amorphous polyester resin comprising a polyester derived from dodecenyl succinic acid, dodecenyl succinic anhydride, or a combination thereof present in an amount of from about 5 to about 15 weight percent, based on the total weight of the first amorphous polyester; (b) a second higher molecular weight amorphous polyester resin comprising a polyester derived from dodecenyl succinic acid, dodecenyl succinic anhydride, or a combination thereof, and a branching agent derived from a polyacid or polyol component; wherein the dodecenyl succinic acid, dodecenyl succinic anhydride, or combination thereof is present in the second amorphous polyester in an amount of from about 5 to about 15 weight percent, based on the total weight of the second amorphous polyester; (c) a crystalline polyester resin; (d) a wax; and (e) optionally, a colorant.

A toner having a toner particle that is produced through a step of melt-kneading a resin composition containing a binder resin, a colorant, a hydrocarbon wax, and a wax dispersing agent, cooling the obtained kneaded material, pulverizing the obtained cooled material, and heat treating the resulting resin particles, wherein the wax dispersing agent is a polymer provided by graft polymerizing a styrene-acrylic polymer onto a polypropylene, the styrene-acrylic polymer is a polymer having a monomer unit derived from a cycloalkyl (meth)acrylate, and specific relationships are satisfied where Mp(p) is the melting point (° C.) of the polypropylene and Mp(w) is the melting point (° C.) of the hydrocarbon wax.