Ricoh Company, Ltd.

Masayuki Shoshi

Masaomi Sasaki

Akio Kojima

Michihiko Namba

Kaoru Tadokoro

Megumi Kawahara

Tetsuro Suzuki

Masao Yoshikawa

Tomoyuki Shimada

Chiaki Tanaka

Masakatsu Shimoda

Masafumi Ohta

Kaoru Teramura

Tsuneo Kurotori

Masayuki Koyano

Hongguo Li

Akiko Konishi

Ikuko Yamada

Yuuko Komai

Yumi Ichikawa

Hiroshi Tamura

Soh Noguchi

Yuko Arizumi

Keishi Kubo

Akihiko Kanemoto

Tetsurou Sasamoto

Takeshi Hihara

Yuko Komai

Masahiro Taniucchi

A silicone compound represented by the following Chemical Structure 1: wherein Y represents a substituted or non-substituted alkyl group having one to ten carbon atoms, X1, X2, and X3 independently represent methyl groups or any of Substituents A-1 to A-7, and l, m, and n are independently zero or an integer of from 1 to 6.

Silicone compound, photocurable liquid ink using the silicone compound, and method of manufacturing the ink

To provide a photocurable liquid developer including colored resin particles, and an electrically insulating liquid that cures by light, wherein the electrically insulating liquid contains an unsaturated group-containing silicone compound represented by General Formula (1) below,  

Photocurable liquid developer, method for producing the same, developing device and image forming apparatus

The object of the invention is to provide a novel aromatic polyester resin useful as a binder resin or charge transporting polymer for an organic photoconductor and an electrophotographic photoconductor having high sensitivity and high durability produced using the above-noted novel aromatic polyester resin. For this object, the invention provides an aromatic polyester resin which has a recurring unit represented by the following Formula (I) and an electrophotographic photoconductor produced using the above-noted aromatic polyester resin. 

Aromatic polyester resin, and electrophotographic photoconductor and image forming apparatus using thereof

An object of the present invention is to provide an electrophotographic photoconductor for liquid development, having high resistance to a carrier solvent for use in a liquid developing method and having practically high sensitivity, an image-forming apparatus including the photoconductor, and an image forming method. To achieve this object, the present invention provides an electrophotographic photoconductor for liquid development including a support, and a photosensitive layer on or above the support, wherein the photosensitive layer includes a charge-generating material, a charge-transporting material, and an acceptor compound, and the charge-transporting material includes a charge-transporting polymer having a specified structure.

Electrophotographic photoconductor for liquid development, image forming apparatus having the same, and image forming method

A polycarbonate resin has a constitutional unit expressed by the following general formula (I):  Arepresents an alkyl group which is substitutional or nonsubstitutional, and an aryl group which is substitutional or nonsubstitutional. A, A, A, A, Aand Aeach represent one of a hydrogen atom, a halogen atom, an alkyl group which has 1 to 6 carbon atoms and is substitutional or nonsubstitutional.

Electrophotographic photoconductor comprising a polycarbonate resin having a dihydroxy diphenyl ether unit

To provide a highly sensitive and highly durable electrophotographic photoconductor, electrophotography, photographic apparatus and process cartridge for the electrophotographic apparatus which is practical for a high-speed copying machine as well as for a laser printer. The electrophotographic photoconductor includes a photoconductive layer on a conductive support, in which the photoconductive layer contains an azo compound expressed by Formula (1) and wherein at least one of 'Cp' and 'Cp' contains a coupler residue selected from Formula (2), Formula (3) and Formula (4).

Electrophotographic photoconductor, electrophotography, electrophotographic apparatus, process cartridge for electrophotographic apparatus and azo compound

An electrophotographic photoconductor contains a conductive support; and a photoconductive layer disposed on the photoconductive support; wherein the photoconductive layer contains an azo compound expressed by a general formula &#x3c;&#x3c;1&#x3e;&#x3e;ArN&#x2550;N&#x2014;Cp),&#x2003;&#x2003;(&#x3c;&#x3c;1&#x3e;&#x3e;)wherein in the general formula &#x3c;&#x3c;1&#x3e;&#x3e;, Ar is a substituted or non-substituted aromatic series hydrocarbon group or an aromatic series heterocyclic ring group which can be bonded by way of a bonding group; Cp is a coupler residual group; n represents an integer of 1, 2, 3, or 4, at least one of the Cp is a coupler residual group selected from the group consisting of general formulae &#x3c;&#x3c;2&#x3e;&#x3e;, &#x3c;&#x3c;3&#x3e;&#x3e;, and &#x3c;&#x3c;4&#x3e;&#x3e; 

Electrophotographic photoconductor, process for forming an image, image forming apparatus and process cartridge for the same

Providing an electrophotographic photoconductor comprising a conductive support and a photoconductive layer disposed on the photoconductive support; wherein the photoconductive layer contains an azo compound expressed by a general formula &#x3c;&#x3c;1&#x3e;&#x3e;.Ar&#xe00c;N&#x2550;N&#x2014;Cp)&#x2003;&#x2003;general formula &#x3c;&#x3c;1&#x3e;&#x3e;(in the general formula &#x3c;&#x3c;1&#x3e;&#x3e;, Ar expresses one of a substituted or non-substituted aromatic carbon hydride group and heterocyclic ring aromatic series group which can be combined by way of a bond group; Cp expresses a coupler residual group; n expresses an integer of one of 1, 2, 3, and 4; at least one of the Cp is a coupler residual group selected from one of the following general formulae &#x3c;&#x3c;2&#x3e;&#x3e;, &#x3c;&#x3c;3&#x3e;&#x3e;, and &#x3c;&#x3c;4&#x3e;&#x3e;.)

Electrophotographic photoconductor, process for forming an image, image forming apparatus and a process cartridge for the same

REACTION PRODUCT, PROCESS FOR THE PRODUCTION THEREOF, ELECTROPHOTOGRAPHIC PHOTOCONDUCTOR USING THE REACTION PRODUCT, ELECTROPHOTOGRAPHIC APPARATUS USING THE PHOTOCONDUCTOR, AND PROCESS CARTRIDGE FOR ELECTROPHOTOGRAPHIC APPARATUS

Mixture of titanyltetraazaporphyrin compounds and electrophotographic photoconductor using the same

A reaction product useful as an organic photoconductive material for electrophotographic photoconductors is provided, obtainable by reacting (i) a nitrile derivative, (ii) a phthalonitrile derivative or a 1,3-diiminoisoindoline derivative and, if necessary, (iii) a metal or a metal-containing compound.

REACTION PRODUCT, PROCESS OF PRODUCING SAME, ELECTROPHOTOGRAPHIC PHOTOCONDUCTOR USING SAME, ELECTROPHOTOGRAPHIC APPARATUS HAVING THE PHOTOCONDUCTOR, AND PROCESS CARTRIDGE FOR ELECTROPHOTOGRAPHIC APPARATUS

A mixture is made of a plurality of different titanyltetraazaporphyrin compounds, each of which is represented by formula (1):

A pigment includes a compound with a tetraazaporphyrin skeleton represented by formula (I): ##STR1## wherein M is a hydrogen atom, or an atom or compound capable of bonding to tetraazaporphyrin through a covalent bond or a coordinate bond; and R.sup.1 to R.sup.8 are each independently a hydrogen atom, a lower alkyl group which may have a substituent, or an aryl group which may have a substituent. In addition, the above-mentioned pigment is used as a charge generation material in an electrophotographic photoconductor comprising an electroconductive support and a photoconductive layer formed thereon.

Tetraazaporphyrin pigment for use in electrophotographic photoconductor

An electrophotographic photoconductor has an electroconductive support, and a photoconductive layer formed thereon which contains as a charge generation material a pigment including a compound with a tetraazaporphyrin skeleton represented by formula (I): ##STR1## wherein M is a hydrogen atom, or an atom or compound capable of bonding to tetraazaporphyrin through a covalent bond or a coordinate bond; and R.sup.1 to R.sup.4 are each independently a hydrogen atom, a lower alkyl group which may have a substituent, or an aryl group which may have a substituent.

Electrophotographic photoconductor

An electrophotographic photoconductor has an electroconductive support and a photoconductive layer provided thereon, containing at least one phenol compound of formula (1): ##STR1## wherein R.sup.1 to R.sup.4 and R.sup.11 to R.sup.14 are each independently a hydrogen atom, an alkyl group which may have a substituent, an alkoxyl group which may have a substituent, an alkoxycarbonyl group which may have a substituent, an aryl group which may have a substituent, nitro group, cyano group or a halogen atom; and Y is ##STR2## in which R is a hydrogen atom, an alkyl group which may have a substituent, an alkoxyl group which may have a substituent, an alkoxycarbonyl group which may have a substituent, an aryl group which may have a substituent, nitro group, cyano group, hydroxyl group or a halogen atom, and n is an integer of 0 to 5, or --(CH.dbd.CH).sub.x --, in which x is an integer of 0 to 5.

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Yokohama, Japan

Masayuki Shoshi