Konica Minolta, Inc.

Konica Minolta Business Technologies, Inc.

Naoya Tonegawa

Masaharu Matsubara

Junya Onishi

Takanari Kayamori

Atsushi Iioka

Masahiro Anno

Masahiko Nakamura

Tsuyoshi Uchida

Kenichi Onaka

Kouji Sekiguchi

Tatsuya Nagase

Shiro Hirano

Tatsuya Fujisaki

Junichi Furukawa

Kouji Izawa

Asao Matsushima

Aya Shirai

Kenshi Miyajima

Hidehito Haruki

Atsushi Iloka

An electrostatic image developing toner includes toner base particles, wherein the toner base particles contain: an amorphous polyester resin; a crystalline resin; and o-acetoacetaniside, and the content of the o-acetoacetaniside in the toner base particles is 0.1 ppm by mass or more and 200 ppm by mass or less.

Electrostatic image developing toner and developer

To provide a magenta toner for electrostatic charge image development including a crystalline polyester resin and an amorphous resin as a binder resin, which is a means for improving low temperature fixability, scattering properties, GI value, saturation, and light fastness. A magenta toner for electrostatic charge image development including an amorphous resin and a crystalline polyester resin as a binder resin, wherein predetermined quinacridone-based pigment, metal element-containing monoazo pigment, and naphthol AS-based pigment are included as a coloring agent, and the combined content of the quinacridone-based pigment and the metal element-containing monoazo pigment is 50-90% by mass of the total coloring agent.

Magenta toner for electrostatic charge image development

An electrostatic charge image developing white toner according to the present invention includes toner base particles including rutile type titanium oxide particles as colorant and a binder resin. The rutile type titanium oxide particles are composed of two groups Ga and Gb of rutile type titanium oxide particles have different volume particle size distribution. A volume particle size distribution curve of the rutile type titanium oxide particles represents diameter on a horizontal axis and volume ratio on a vertical axis and has two main peaks. Diameters Da and Db of peak top positions of the two main peaks are respectively within a range of 100 to 500 nm, and satisfy following Relational expressions:(Relational expression 1):&#x2003;&#x2003;25 nm&#x2264;&#x2264;200 nm(Relational expression 2):&#x2003;&#x2003;(mass of):(mass of)=5:95 to 30:70.

Electrostatic charge image developing white toner, manufacturing method thereof, image forming apparatus, and image forming method

An electrostatic charge image developing toner includes a toner matrix particle having a core-shell structure. The toner matrix particle contains: a core particle including an amorphous resin, a colorant, a release agent, and a crystalline resin; and a shell layer coating a surface of the core particle at a coverage of 60 to 99%. The shell layer includes an amorphous resin. The amorphous resin contained in the core particle differs from the amorphous resin contained in the shell layer. The toner matrix particle has one to seven discrete shell domains determined by observation of a cross section of the toner matrix particle with an electron microscope.

Electrostatic charge image developing toner

A method of producing a toner for developing electrostatic images includes Steps I to III is provided. The toner includes a toner matrix particle having a core-shell structure. The toner matrix particle includes a core particle including an amorphous resin A and a crystalline material, and a shell including an amorphous resin B. The shell includes a phase of the amorphous resin B that is not fused with the core particle at the interface. The amorphous resin A differs from the amorphous resin B.

Method of producing toner for developing electrostatic images

An object of the present invention is to provide an electrostatic image developing toner including toner particles containing: an amorphous resin including an amorphous vinyl resin; and a crystalline resin, wherein the toner particles contain: a coloring agent including C. I. Pigment Yellow 74; and alkoxy aniline with an amount in the range of 0.1 to 50.0 mass ppm in the toner particles.

Electrostatic image developing toner

Provided is a method of forming an electrophotographic image using a plurality of color toners, the method containing: a charging step; an exposing step; a developing step; and a transferring step, wherein the plurality of color toners each respectively contain toner particles including a binder resin, a coloring agent, a releasing agent, and a crystalline resin; the binder resin contains an amorphous vinyl polymer formed with a vinyl monomer; the toner particles contain the amorphous vinyl polymer in the range of 10 to 90 mass %; and a maximum value of an acid value difference of the color toners is in the range of 1 to 10 mg KOH/g.

Electrophotographic image forming method and full color toner set for developing electrostatic image

Provided is an electrostatic image developing toner containing toner particles having a domain-matrix structure formed with a matrix of an amorphous polyester resin and a domain of a crystalline resin, wherein the toner particles contain an releasing agent and alkoxy aniline; and a content of the alkoxy aniline contained in the toner particles is in the range of 0.1 to 15.0 mass ppm.

An electrostatic image developing toner includes toner particles that contain coloring particles containing a binder resin, a coloring agent and a releasing agent. The binder resin includes an amorphous resin and a crystalline polyester resin. The toner satisfies Relations (1) and (2). &#x394;H1 is the amount of heat absorption based on a melting peak of the crystalline polyester resin in a first heating step. &#x394;H2 is the amount of heat absorption based on a melting peak of the crystalline polyester resin in a second heating step. &#x394;H0 is the value of the amount of heat absorption based on a melting peak of the crystalline polyester resin in the second heating step, multiplied by the ratio of the crystalline polyester introduced in the electrostatic image developing toner.0.43&#x3c;&#x394;1/&#x394;0&#x3c;0.95&#x2003;&#x2003;Relation (1):0.45&#x3c;&#x394;2/&#x394;1&#x3c;1.20&#x2003;&#x2003;Relation (2):

The toner according to the present invention comprises a matrix phase composed of a vinyl resin, and domain phases composed of a non-crystalline polyester resin dispersed in the matrix phase, and a number-average domain diameter of the domain phases composed of the non-crystalline polyester resin is 30 to 150 nm. The toner satisfies relation represented by a specific requirement of the total area of the domain phases present in a surface layer area of the toner particle, and the total area of the domain phases present in areas other than the surface layer area, in a given cross-section of the toner particle.

Toner for developing electrostatic latent image and process for producing the same

According to one implementation, a toner includes a toner mother particle and a convex portion on a surface of the toner mother particle. The toner mother particle includes at least a resin (1). The convex portion is formed from a resin particle including at least a resin (2). An average value of a length of a long side of the convex portion is within a range of 0.1 to 0.5 &#x3bc;m. A ratio between a Young's modulus of a non-convex portion of the toner mother particle (ER (1)) and a Young's modulus of a convex portion of the toner mother particle (ER (2)) is a value (ER (1)/ER (2)) within the range of 1.2 to 2.0.

Toner for developing electrostatic latent image and manufacturing method thereof

The present invention provides a developer for electrophotography which is superior in property of build up of electrification and in charge stability even in environments of high temperature and high humidity or in an environment of low temperature and low humidity where it is difficult for a developer to retain its electrostatic charge performance, and which can provide an image free from fogging and decrease in density for a long term, that is, a developer for electrophotography containing composite oxide particles which include metal titanate particles containing titanium as a first metal atom and a second metal atom and containing therein 0.009 to 0.350% by weight of a third metal atom selected from the group consisting of the metal atoms belonging to Group 5A of the long form of the periodic table of elements.

Developer for electrophotography

It is to provide a toner which can form an image of high image quality exhibiting high resolution wherein a final visible image exhibits high image density and high thin-line reproducibility even in long-term use. In a toner incorporating at least a colored particle containing a binder resin composed of a polyester resin and a colorant, and external additive particles, the toner has a degree of average circularity of 0.950-0.990, a volume based median diameter of 4.5-8.0 &#x3bc;m, a volume based particle diameter dispersibility (CVvalue) of 15-25; a metal selected from titanium, germanium, and aluminum is incorporated at a ratio of 10-1500 ppm; the above external additive particles is composed of a composite oxide incorporating a silicon atom and at least either of a titanium atom and an aluminum atom; and the existence ratio of silicon atoms in the surface thereof is higher than the existence ratio of silicon atoms in the entire part thereof.

Toner

A two component developer comprising a toner and a carrier, wherein the toner includes: colored particles; and external additive particles comprising a complex oxide incorporating silicon atoms and at least one of titanium atoms and aluminum atoms, and a surface existing ratio of the silicon atoms (R) in a surface of the external additive particles being larger than an average existing ratio of the silicon atoms (R) in an entirety of the external additive particles, and carrier particles comprise magnetic material powder dispersed in a phenol-formaldehyde resin, and have an average of the shape coefficient SF-1 of 1.0 to 12 and an average of the shape coefficient SF-2 of 1.1 to 2.5, and a volume based median diameter of from 10 to 100 &#x3bc;m.

Two component developer and image forming method

Provided is a method for forming an image containing the steps of: (a) forming an electrostatic latent image on an electrostatic latent image carrier; and (b) developing the electrostatic latent image by a two component developer comprising a toner and a carrier, wherein the two component developer is continually replenished in the developing step (b); and the toner includes: colored particles; and external additive particles comprising a complex oxide incorporating silicon atoms and at least one of titanium atoms and aluminum atoms, and a surface existing ratio of the silicon atoms (R) in a surface of the external additive particles being larger than an average existing ratio of the silicon atoms (R) in an entirety of the external additive particles.

Growing community of inventors

Sagamihara, Japan

Naoya Tonegawa