A method for producing a carrier for electrostatic charge image development includes coating magnetic particles by adding the magnetic particles and a coating liquid containing a resin and a solvent to a mixer with a stirring blade to form a resin coating layer on surfaces of the magnetic particles and taking a carrier having the resin coating layer out of the mixer. In the coating, the stirring conditions after the solvent is evaporated and dried by heating in the mixer until the carrier is taken out of the mixer satisfy Formula 1 below and Formula 2 below:
0.2?peripheral speed ?Dn (m/s) of stirring blade?2.0Formula 1,
1?10.sup.3?stirring workload (peripheral speed?stirring time T)?4?10.sup.3Formula 2, where D represents a diameter (m) of the stirring blade, n represents a number of revolutions (rps) of the stirring blade, and T represents a time (s) from a time point at which, after a load power of the stirring blade before drying of the solvent increases with drying until completion of drying, a load power of the stirring blade decreases to 1.3 times or less the load power of the stirring blade before drying to a time point at which stirring in the mixer is stopped.

An electrostatic latent image developing carrier includes carrier particles each including a carrier core and first and second coat layers covering a surface of the carrier core. The first and second coat layers give a layered structure in which the first coat layer and the second coat layer are layered in order from the surface of the carrier core. The first coat layer contains a fluororesin. The second coat layer contains a silicone resin and a fluorine silane in an amount of at least 1% by mass relative to a mass of the silicone resin. An area S.sub.A of a region of a surface region of the first coat layer that is covered with the second coat layer and an area S.sub.B of a region thereof that is not covered with the second coat layer satisfy a relationship represented by 0.05S.sub.B/(S.sub.A+S.sub.B)0.50.

An electrostatic latent image developing carrier includes carrier particles each including a carrier core and first and second coat layers covering a surface of the carrier core. The first and second coat layers give a layered structure in which the first coat layer and the second coat layer are layered in order from the surface of the carrier core. The first coat layer contains a fluororesin. The second coat layer contains a silicone resin and a fluorine silane in an amount of at least 1% by mass relative to a mass of the silicone resin. An area S.sub.A of a region of a surface region of the first coat layer that is covered with the second coat layer and an area S.sub.B of a region thereof that is not covered with the second coat layer satisfy a relationship represented by 0.05S.sub.B/(S.sub.A+S.sub.B)0.50.

A toner comprising a toner particle that contains a binder resin and a colorant, wherein (1) an average circularity of the toner is at least 0.960, (2) an onset temperature T ( C.) of a storage elastic modulus E of the toner, as determined by a powder dynamic viscoelastic measurement, is from 50 C. to 70 C., and (3) in a differential curve obtained by differentiation, by load, of a load-displacement curve provided by measurement of the strength of the toner by a nanoindentation procedure, with the horizontal axis being load (mN) and the vertical axis being displacement (m), the load X that provides the maximum value in the differential curve in the load region from 0.20 mN to 2.30 mN is from 1.00 mN to 1.50 mN.

A toner having a toner particle containing a binder resin, an amorphous polyester, and a colorant, wherein a softening point of the toner is at least 110 C. and not more than 140 C.; an integrated value f1 for stress of the toner is not more than 10 g.Math.m/sec, as measured using a tack tester, with a temperature for a probe end being 150 C. and a press holding time being 0.01 seconds; and an integrated value f2 for stress of the toner is at least 30 g.Math.m/sec, as measured using a tack tester, with a temperature for a probe end being 150 C. and a press holding time being 0.1 seconds.

An electrostatic charge image developing toner includes a particulate toner matrix containing a binder resin and an external additive. The binder resin includes an amorphous polyester resin, a crystalline resin, and an amorphous vinyl resin. A storage modulus G.sub.0(t) measured before the toner is left and storage moduli G.sub.Tm-10(t) and G.sub.Tm-20(t) measured after the toner is left for three hours at temperatures (T.sub.m-10) C. and (T.sub.m-20) C., respectively, based on a melting point (T.sub.m C.) derived from the crystalline resin satisfy the relations represented by G.sub.0(t)<G.sub.Tm-10(t), G.sub.0(t)<G.sub.Tm-20(t), and G.sub.Tm-10(x)/G.sub.Tm-20(x)1.5 in a temperature range A for measurement where the storage modulus G.sub.0(t) is 1.010.sup.6 Pa or more. The value t represents any temperature ( C.) for measurement in the temperature range A for measurement; and the value x represents the temperature ( C.) for measurement having a maximum difference between the storage moduli G.sub.Tm-10(t) and G.sub.Tm-20(t).

A white toner according to an embodiment includes: a raw white toner not containing a colloidal silica and containing a white pigment and a crystalline resin; and 1.0 to 1.1 parts by weight of a colloidal silica per 100 parts by weight of the raw white toner. The white toner has a true density of 1.8 to 2.2 g/cm.sup.3.

An electrostatic charge image developing toner includes a particulate toner matrix containing a binder resin and an external additive. The binder resin includes an amorphous polyester resin, a crystalline resin, and an amorphous vinyl resin. A storage modulus G.sub.0(t) measured before the toner is left and storage moduli G.sub.Tm-10(t) and G.sub.Tm-20(t) measured after the toner is left for three hours at temperatures (T.sub.m-10) C. and (T.sub.m-20) C., respectively, based on a melting point (T.sub.m C.) derived from the crystalline resin satisfy the relations represented by G.sub.0(t)<G.sub.Tm-10(t), G.sub.0(t)<G.sub.Tm-20(t), and G.sub.Tm-10(x)/G.sub.Tm-20(x)1.5 in a temperature range A for measurement where the storage modulus G.sub.0(t) is 1.010.sup.6 Pa or more. The value t represents any temperature ( C.) for measurement in the temperature range A for measurement; and the value x represents the temperature ( C.) for measurement having a maximum difference between the storage moduli G.sub.Tm-10(t) and G.sub.Tm-20(t).

A toner includes a toner particle containing a resin component. The resin component contains an ester group-containing olefin copolymer and an acid group-containing olefin copolymer. For example, the ester group-containing olefin copolymer is an ethylene-vinyl acetate copolymer, and the acid group-containing olefin copolymer is an ethylene-methacrylic acid copolymer. The acid group-containing olefin copolymer has an acid value of 50 to 300 mg KOH/g. The content of the ester group-containing olefin copolymer in the resin component is 50 mass % or more based on the total mass of the resin component. The content of the unit derived from the vinyl acetate is 3 mass % or more and 35 mass % or less based on the total mass of the ester group-containing olefin copolymer.

The present invention relates to a toner for electrostatic charge image development, including: a toner base particle having at least a binder resin, a releasing agent, and a colorant, wherein the following formula (1) is satisfied wherein a maximum value and a minimum value of a dielectric loss tangent tan , which are obtained by measuring at a frequency in the range of 1 kHz to 100 kHz under the condition at a temperature of 20 C. and a relative humidity of 50% RH, are defined as tan .sub.max and tan .sub.min, respectively. According to the present invention, a toner for electrostatic charge image development, with which the rising of the toner charge amount is improved while ensuring the low temperature fixability, and a high quality image having less density unevenness can be obtained even during the image forming at a high speed and a high printing rate, is provided.
Frequency showing tan .sub.max<Frequency showing tan .sub.min(1)