Minolta Company, Ltd.

Tetsuo Sano

Yoshitaka Sekiguchi

Kenichi Kido

Hiroyuki Fukuda

Masayuki Hagi

Takeshi Arai

Yoshihiro Mikuriya

Junichi Tamaoki

Megumi Aoki

Chikara Tsutsui

Masahiro Anno

Katsunori Kurose

Junji Machida

Masaaki Takama

Mikihiko Sukeno

Choichiro Tanigawa

Senyu Taira

Satoru Iwata

Hideaki Tsukamoto

Masao Nakajima

Color toner for developing electrostatic image comprising two kinds of polyesters and two kinds of releasing agents

Color toner for developing electrostatic image, comprising first linear polyester and second non-linear polyester as binder resin

The present invention relates to a toner that contains at least a binder resin and a colorant, characterized in that the toner has a temperature range of 90 to 110&deg; C. at 2&times;10 (Pa) of a storage elastic modulus (G&prime;) under 0.1 (Hz) of a frequency.

Toner used for developing electrostatic latent image

A toner is provided for developing an electrostatic image which has relatively high roundness, uniform shape, excellent property of electrification, electrification stability, maintenance of heat resistance, fixability, image quality and productivity, and is effective for full-color image formation, cleanerless system and toner-recycling system. The toner comprises toner particles containing a binder resin (A), a polymer (B) and a colorant, the polymer (B) having weight-average molecular weight of 1000-3000 and a ratio of weight-average molecular weight/number-average molecular weight of not more than 2.0, wherein the polymer (B) particles exist on surfaces of the toner particles.

Toner for developing an electrostatic image

Electrostatic-latent-image developing toner and inorganic particles used for such a toner

Developer for developing electrostatic latent images

The present invention provides a toner for developing an electrostatic latent image which suppresses an adhesion and wearability on a surface of a photosensitive member and exhibits an excellent rising property of an electrification. The toner comprises (i) toner particles containing a binder resin and a colorant, (ii) a first external additive consisting of first inorganic particles whose number-average particle size is 5-40 nm, (iii) a second external additive consisting of second inorganic particles whose number-average particle size, which is larger than that of the first external additive, is 20-160 nm, (iv) a third external additive consisting of third inorganic particles whose number-average particle size, which is larger than that of the second external additive, is 80-1200 nm, and (v) a fourth external additive consisting of a metal salt of fatty acid whose volume-average particle size is 1.5-12 &mgr;m, said four external additives being externally added to the toner particles.

Toner for developing an electrostatic latent image

Toner for an electrostatic latent image development

The negatively chargeable toner of the present invention comprises negatively chargeable toner particles including a boron compound, and exterior additive particles adhered to the surface of the toner particle and comprising hydrophobic silica particles and metal titanate particles, wherein the additive weight ratio of said hydrophobic silica particles and metal titanate particles is within a range of 5:1 to 1:1.2, and a total specific surface area S of the exterior additive particles is 40 to 120.

Negatively chargeable toner for developing electrostatic latent images

This invention relates to a single component toner comprising specified polyester resins as binder resin and used in single-component developing system in which toner particles are electrically charged when passing through the opening between a toner-levelling member and a toner-transporting member positioned against a photosensitive member.

Single component toner comprising specified polyester

The present invention relates to a toner for developing a digital-image, comprising particles having rounded surfaces and having the following size distribution:

Toner for developing electrostatic latent image with specific

The present invention relates to a toner comprising a specific binder resin, a specific polyethylene wax and a specific polypropylene wax. The present invention further relates to a toner which comprises a binder resin including a specific first resin and a specific second resin.

Toner for developing electrostatic latent image

The present invention relates to a negatively chargeable toner comprising at least a binder resin, carbon black, and charge controller, wherein said charge controller is a colorless or white in color boron compound, and wherein a melt viscosity curve of said negatively chargeable toner has an inflection point of a viscosity slope, an inflection point temperature (T.sub.2) existing within a temperature range of T.sub.1 +20.degree. C. to T.sub.1 +40.degree. C. relative to a flow start temperature (T.sub.1), a first absolute value (.DELTA..eta..sub.1) existing within a range of 4.0.times.10.sup.-2 to 6.0.times.10.sup.-2, said first absolute value. (.DELTA..eta..sub.1) being a mean viscosity slope within a temperature range below the inflection point temperature (T.sub.2), a second absolute value (.DELTA..eta..sub.2) existing less than 2.0.times.10.sup.-2, said second absolute value (.DELTA..eta..sub.2) being a mean viscosity slope within a temperature range higher than said inflection point temperature (T.sub.2) is less than 2.0.times.10.sup.-2, and a temperature difference between said inflection point temperature (T.sub.2) and a flow stop temperature (T.sub.3) being 5.degree. C. or more.

Negatively chargeable toner for developing electrostatic latent image

The present invention provides a toner for developing an electrostatic latent image comprising:a colorant; and binder resin including a low-molecular component having a weight-average molecular weight from 3,000 to 15,000 which is obtained by gel permeation chromatography (GPC), said low-molecular component being included from 60 percent-by-weight to 80 percent-by-weight with respect to the binder resin.

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Amagasaki, Japan

Tetsuo Sano