Konica Corporation

Konica Minolta Business Technologies, Inc.

Konica Minolta, Inc.

Tomoo Sakimura

Akihiko Itami

Kazuhisa Shida

Takeo Oshiba

Shinichi Hamaguchi

Shingo Fujimoto

Yohko Kitahara

Masahiko Kurachi

Hirofumi Hayata

Mayuko Matsusaki

Akira Kinoshita

Masao Asano

Toyoko Shibata

Tomoko Suzuki

Hiroshi Yamazaki

Takeshi Ishida

Asao Matsushima

Kazumasa Watanabe

Tomoko Sakimura

Kunihiro Ogura

Yoshihiko Etoh

Hiroshi Nakahara

Naoki Nozaki

Shinichi Yabuki

Nobuaki Kobayashi

Teruo Sasaki

Kageyuki Tomoyori

Mayuko Ushiro

Hirohiko Seki

Tadaaki Sumitani

Tsuyoshi Shimoda

Takeo Ooshiba

Masahiro Ishie

Hidaya Miwa

Shinchi Hamaguchi

Chigusa Miyake

A method for producing a porous resin particle including a mesoporous structure portion and an outer shell portion integrally formed on a surface of the mesoporous structure portion includes, in a state that an oil-phase liquid, in which a polymerizable monomer and an oil-soluble polymerization initiator having a polymerization initiating ability to the polymerizable monomer are dissolved or dispersed in a hydrophobic solvent, is dispersed as oil droplets in an aqueous medium containing a water-soluble polymerization initiator having a polymerization initiating ability to the polymerizable monomer, generating a plurality of mesopores inside the porous resin particle by forming a solid medium, by polymerizing the polymerizable monomer by acting the oil-soluble polymerization initiator and the water-soluble polymerization initiator at the same time on the polymerizable monomer.

Porous resin particle and method for producing the same, and structure

A fixing member includes a base material, an elastic layer, and a surface layer, all of which are laminated in the order in a thickness direction, wherein the surface layer has a porous structure formed by a plurality of pores, each of which has a pore size of less than 1 &#x3bc;m.

Fixing member, image forming apparatus, fixing method, and image forming method

A method of producing, in a liquid, a hollow particulate material having a cavity therein, the method including: (A) blowing gas into a resin solution containing a first dispersion medium; (B) pouring the resin solution to which the gas is blown in step (A) into a second dispersion medium to form liquid droplets encapsulating the gas and prepare a dispersion of the liquid droplets; and (C) solidifying the liquid droplets formed in step (B) and isolating the solidified liquid droplets from the second dispersion medium.

Method of producing hollow particulate material

Provided is a method for the production of a hollow particle, which can easily produce a hollow particle having plural spaces formed inside. The method for the production of a hollow particle is a method for the production of a hollow particle having plural spaces inside thereof, which comprises dispersing an oil-phase liquid prepared by dissolving or dispersing a polymerizable monomer and an oil-soluble polymerization initiator having polymerization initiation ability for the polymerizable monomer in a hydrophobic solvent, in an aqueous medium containing a water-soluble polymerization initiator having polymerization initiation ability for the polymerizable monomer, to form an oil droplet; and applying the oil-soluble polymerization initiator and the water-soluble polymerization initiator at the same time to the polymerizable monomer, and polymerizing the polymerizable monomer, to form a shell dividing plural spaces in a particle.

Method for production of hollow particle

Disclosed is a production process of an organic photoreceptor which can suppress occurrence of uneven density and image defects. The production process of an organic photoreceptor, the organic photoreceptor including an intermediate layer and an organic photosensitive layer on the intermediate layer, includes: applying a coating liquid for forming the intermediate layer to a conductive support to form a coating film, the coating liquid being obtained by dissolving a binder resin in a solvent and dispersing first and second metal oxide fine particles therein; and drying the coating film. The Pe number of the first metal oxide fine particles is two or more times larger than that of the second metal oxide fine particles.number=(6&#x3c0;&#x3bc;)/&#x2003;&#x2003;Equation (1):

Production process of organic photoreceptor

The present invention provides an electrophotographic photoconductor including an electrically conductive substrate, an intermediate layer, and a photosensitive layer that are formed on the electrically conductive support, the intermediate layer including first titanium oxide particles surface-treated with a first reactive organic silicon compound, second titanium oxide particles surface-treated with a second reactive organic silicon compound different from the first reactive organic silicon compound, and a binder resin. The first reactive organic silicon compound is methyl hydrogen polysiloxane. The second reactive organic silicon compound is a compound represented by the following general formula (1):R&#x2014;Si&#x2014;(X)&#x2003;&#x2003;(1)R represents a alkyl group having 1 to 10 carbon atoms substituted by at least one of acryloxy and methacryloxy groups or unsubstituted; and X represents an alkoxy group having 1 to 4 carbon atoms or a halogen atom.

Electrophotographic photoconductor and image forming apparatus

The present invention provides an electrophotographic photoconductor that can improve unevenness in image density and reduce image defects such as fogging and dots. The electrophotographic photoconductor includes a conductive support, an intermediate layer, and a photosensitive layer. The intermediate layer includes metal oxide particles surface-treated with a titanium chelate compound represented by the following formula (1):Ti(OR)(L)&#x2003;&#x2003;(1)wherein R at each occurrence independently represents a Caliphatic hydrocarbon group; L at each occurrence independently represents a ligand derived from a chelating agent selected from the group consisting of &#x3b2;-ketoester represented by the following formula (1a): &#x3b2;-diketone represented by the following formula (1b): and a Calkylene glycol; n represents an integer of 1 to 3; if n is 2 or more, two Rs may be coupled to each other.

Electrophotographic photoconductor, process cartridge including the same, and image forming apparatus including the same

Reduced are interferential streaks in a halftone image, which are produced when using a cylindrical photoreceptor conductive substrate having been subjected to tool bit cutting processing, and provided are an electrophotographic photoreceptor capable of obtaining high image quality in response to a light printing field or the like and an image forming method employing the electrophotographic photoreceptor. Disclosed is an electrophotographic photoreceptor possessing a cylindrical substrate having been finished via cutting processing and provided thereon, a photosensitive layer, wherein among peaks other than at a lag of 0 in a correlogram of a substrate surface profile in a direction along a central axis of the substrate, a mean value from a maximum peak in height to a third peak in height is 0.3-0.8, each of the peaks in height corresponding to an autocorrelation coefficient.

Electrophotographic photoreceptor and image forming method

The present invention provides an electrophotographic photoconductor including an intermediate layer having sufficient electron transportability and blocking property and capable of suppressing image defects such as fogging and dots. The electrophotographic photoconductor according to the present invention includes a conductive support, a photosensitive layer disposed on the conductive support, and an intermediate layer disposed between the conductive support and the photosensitive layer, wherein the intermediate layer comprises metal oxide particles and a binder resin. The metal oxide particles are surface-treated with an alkoxysilane oligomer represented by the following Formula (1):SiO(OR)(OR)&#x2003;&#x2003;Formula (1) wherein Rand Reach individually represents a Calkyl group; n represents an integer of 2 to 20; and m and l each individually represents an integer of 0 or more and satisfies an equation of m+1=2n+2.

Reduced can be interferential streaks produced in a halftone image when using a photoreceptor support (also called a drawn tube) having been subjected to tool bit cutting processing, and provided can be an electrophotographic photoreceptor capable of obtaining high quality in response to the light printing field or the like and an image forming method employing the electrophotographic photoreceptor. Also disclosed is an electrophotographic photoreceptor possessing a cylindrical support and provided thereon, a photosensitive layer, the cylindrical support possessing a processing profile regularly formed along a central axis, provided on a circumferential surface of the cylindrical support, wherein the processing profile satisfies Formula 1: Formula 1 &#x394;L&#x2267;10 &#x3bc;m, where &#x394;L, represents a difference between a processing period width and another processing period width in a central axis direction of the cylindrical support in an image region.

An objective is to provide an organic photoreceptor exhibiting high sensitivity, suitable for exposure to a semiconductor laser having an emission wavelength of 350-500 nm or a light emitting diode, with which generation of memory images as well as image defects caused by very small charge leakage is inhibited, and also to provide an image forming apparatus fitted with the organic photoreceptor. Also disclosed is an organic photoreceptor possessing a charge generation layer and a charge transport layer provided on a conductive substrate, wherein the charge generation layer contains particles made of a condensed polycyclic pigment, having an average major axis length of 500 nm or less, an average aspect ratio of 2.5-5.0, and an aspect ratio variation coefficient of 16% or less.

Electrophotographic photoreceptor and image formation apparatus

An objective is to provide an organic photoreceptor exhibiting high sensitivity, suitable for exposure to a semiconductor laser having an emission wavelength of 350-500 nm or a light emitting diode, with which generation of memory images as well as image defects caused by very small charge leakage is inhibited, and also to provide an image forming apparatus fitted with the organic photoreceptor. Also disclosed is an organic photoreceptor possessing a charge generation layer and a charge transport layer provided on a conductive support, wherein the charge generation layer contains particles made of a condensed polycyclic pigment, having an average major axis length of 500 nm or less, an average aspect ratio of 2.5-5.0, and an aspect ratio variation coefficient of 16% or less.

Organic photoreceptor and image forming apparatus

An electrophotographic image forming method is disclosed. The method includes electrically charging a photoreceptor, imagewise exposing the photoreceptor so that a latent image is formed on the photoreceptor, supplying a lubricant on a surface of the photoreceptor, and developing the latent image with a toner so that a toner image is formed on the photoreceptor, transferring the toner image and cleaning the photoreceptor, in which the photoreceptor has an electro-conductive substrate, a photosensitive layer and a protective layer containing inorganic particles, a ratio RSm/Dof an average length of surface roughness profile element in the direction making a right angle with the driving direction of the photoreceptor RSm (&#x3bc;m) to a number-based median diameter of the toner Dis from 0.4 to 2.0, and a skewness of the surface roughness profile of the photoreceptor in the direction making a right angle with the driving direction of the photoreceptor Rsk is from &#x2212;3.0 to 0.0.

Image forming method

An electrophotographic photoreceptor is disclosed, comprising on an electrically conductive support an intermediate layer, a charge generation layer and a charge transport layer in this order, wherein the charge transport layer contains a charge transport material represented by formula (1) and a compound represented by formula (2) and the content of the compound represented by formula (2) is not less than 100 ppm and not more than 5000 ppm. 

Electrophotographic photoreceptor

An electrophotographic photoreceptor to be used in an image forming apparatus having a charge providing means by contacting a charging member to an electrophotographic photoreceptor is disclosed. The photoreceptor has at least an interlayer, a charge generation layer and a charge transfer layer each provided on an electroconductive substrate, and the interlayer has a thickness of from 5 to 25 &#x3bc;m and the charge transfer layer has a thickness of from 5 to 20 &#x3bc;m. An image forming apparatus, image forming method and cartridge for the method are also disclosed.

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Hino, Japan

Tomoo Sakimura