Carbazole Patents (Class 430/79)
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Publication number: 20040152002Abstract: Improved organophotoreceptor comprises an electrically conductive substrate and a photoconductive element on the electrically conductive substrate, the photoconductive element comprising:Type: ApplicationFiled: December 30, 2003Publication date: August 5, 2004Inventors: Zbigniew Tokarski, Nusrallah Jubran, Vytautas Getautis, Maryte Daskeviciene, Valentas Gaidelis, Vygintas Jankauskas
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Publication number: 20040151998Abstract: Charge transport compounds are described that have a multiple number of hydrazone-bridged (N,N-disubstituted)arylamine groups connected by a central bridging group.Type: ApplicationFiled: December 30, 2003Publication date: August 5, 2004Inventors: Nusrallah Jubran, Hwan Koo Lee, Kam W. Law
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Patent number: 6768010Abstract: Organophotoreceptors comprise an electrically conductive substrate and a photoconductive element on the electrically conductive substrate, the photoconductive element comprising: a) a charge transport compound having the formula where R1 and R2 are, independently, hydrogen, an alkyl group, a heterocyclic group, an alkaryl group or an aryl group; X is an aromatic group; Y is an (N,N-disubstituted) arylamine group, such as a (N,N-disubstituted) arylamine group, a carbazole group or a julolidine group; Z is (CH2)m group where m is an integer between 1 and 30 where one or more of the methylene groups is optionally replaced by O, S, C═O, O═C—O, O═C—NR3, sulfoxide, sulfate, phosphate, an aryl group, urethane, urea, a NR4 group, a CHR5 group, or a CR6R7 group where R3, R4, R5, R6, and R7 are, independently, H, hydroxyl, thiol, an amine group, an alkyl group, a heterocyclic group, an alkaryl group, or an aryl group; and E is an epoxy group; and (b) a charge generating coType: GrantFiled: September 16, 2003Date of Patent: July 27, 2004Assignee: Samsung Electronics Co., Ltd.Inventors: Zbigniew Tokarski, Nusrallah Jubran, Vytautas Getautis, Maryte Daskeviciene, Edmundas Montrimas, Valentas Gaidelis
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Publication number: 20040106054Abstract: This invention relates to a novel organophotoreceptor that includes a photoconductive layer havingType: ApplicationFiled: August 20, 2003Publication date: June 3, 2004Inventors: Vytautas Getautis, Edmundas Montrimas, Ingrida Paulauskaite, Valentas Gaidelis, Vygintas Jankauskas, Zbigniew Tokarski, Nusrallah Jubran, Kam W. Law
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Publication number: 20040081903Abstract: This invention relates to a novel organophotoreceptor that comprises an electrically conductive substrate and photoconductive element on the electrically conductive substrate, the photoconductive element havingType: ApplicationFiled: August 5, 2003Publication date: April 29, 2004Inventors: Zbigniew Tokarski, Nusrallah Jubran, Kam W. Law, Vytautas Getautis, Jonas V. Sidaravicius, Maryte Daskeviciene, Vygintas Jankauskas, Edmundas Montrimas, Valentas Gaidelis, Albina Stanisauskaite
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Publication number: 20040063012Abstract: An improved organophotoreceptor comprises an electrically conductive substrate and a photoconductive element on the electrically conductive substrate wherein the photoconductive element hasType: ApplicationFiled: June 9, 2003Publication date: April 1, 2004Inventors: Nusrallah Jubran, Zbigniew Tokarski, Kam W. Law
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Patent number: 6689523Abstract: This invention relates to an organophotoreceptor that includes: (a) a charge transport compound having the formula where R1 and R2 are, independently, a carbazolyl group; R3 and R4 are, independently, hydrogen, an alkyl group, an aryl group, or a heterocyclic group; and X is a sulfonyldiphenylene group; (b) a charge generating compound; and (c) an electrically conductive substrate.Type: GrantFiled: October 31, 2002Date of Patent: February 10, 2004Assignee: Samsung Electronics Co., Ltd.Inventors: Kam W. Law, Nusrallah Jubran, Zbigniew Tokarski
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Publication number: 20030232261Abstract: This invention relates to a novel organophotoreceptor that includes:Type: ApplicationFiled: May 7, 2003Publication date: December 18, 2003Inventors: Zbigniew Tokarski, Nusrallah Jubran, Vytautas Getautis, Jonas V. Sidaravicius, Edmundas Montrimas, Maryte Daskeviciene, Valentas Gaidelis, Vygintas Jankauskas, Albina Stanisauskaite
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Publication number: 20030224270Abstract: A high-sensitivity and long-life electrophotographic photoreceptor comprising an electroconductive substrate and at least a photosensitive layer on the electroconductive substrate is provided, wherein the photosensitive layer contains a polyarylate resin not having a nitrogen atom in its repeating unit, and the Hall mobility at an electric field strength of 3×105 (V/cm) and at a temperature of 21° C. of the photosensitive layer is 3×10−6 (cm2/Vs) or more.Type: ApplicationFiled: June 3, 2003Publication date: December 4, 2003Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Teruyuki Mitsumori, Akiteru Fujii, Mamoru Nozomi, Satoshi Kato, Yuuta Kamano
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Publication number: 20030219662Abstract: Charge transport compounds are described that have a multiple number of hydrazone-bridged heterocyclic groups (especially julolidine groups, carbazole groups, triarylamine groups and (N,N-disubstituted)arylamine groups such as dialkarylamine groups (e.g. dimethylphenylamine; methylethylphenylamine, dipropylphenylamine, ethylepropylphenylamine, ethylbutylnaphthylamine, etc.), alkyldiarylamine groups (e.g. methyldiphenylamino, ethyldiphenylamino, etc), and triarylamino groups (e.g., triphenyl amino, trinaphthylamino, etc)) connected by a central bridging group.Type: ApplicationFiled: May 30, 2003Publication date: November 27, 2003Applicant: SAMSUNG Electronics Co. Ltd.Inventors: Nusrallah Jubran, Zbigniew Tokarski, Kam Law, Vytautas Getautis, Jonas Sidaravicius, Osvaldas Paliulis, Valentas Gaidelis, Vygintas Jankauskas
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Publication number: 20030215728Abstract: Improved organophotoreceptor include:Type: ApplicationFiled: March 6, 2003Publication date: November 20, 2003Inventors: Nusrallah Jubran, Zbigniew Tokarski, Kam W. Law
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Publication number: 20030207188Abstract: Improved organophotoreceptors have:Type: ApplicationFiled: March 6, 2003Publication date: November 6, 2003Inventors: Nusrallah Jubran, Zbigniew Tokarski, Kam W. Law
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Publication number: 20030203296Abstract: This invention relates to a novel organophotoreceptor that includes: (a) a charge transport composition comprising molecules having the formula 1Type: ApplicationFiled: March 10, 2003Publication date: October 30, 2003Inventors: Kam W. Law, Nusrallah Jubran, Zbigniew Tokarski
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Publication number: 20030190540Abstract: 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 <<1>>.Type: ApplicationFiled: September 13, 2002Publication date: October 9, 2003Inventors: Masayuki Shoshi, Yuuko Komai, Hongguo Li, Masaomi Sasaki
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Publication number: 20030129513Abstract: Charge transport compounds are described that have a multiple number of hydrazone-bridged heterocyclic groups (especially julolidine, carbazole and/or triarylmethane groups) connected by a central bridging group.Type: ApplicationFiled: September 24, 2001Publication date: July 10, 2003Applicant: Samsung Electronics Co., Ltd.Inventors: Nusrallah Jubran, Hwan Koo Lee, Kam W. Law
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Publication number: 20030113132Abstract: A novel charge transport compound, a novel process using that novel compound and an organophotoreceptor includes:Type: ApplicationFiled: August 9, 2002Publication date: June 19, 2003Applicant: Samsung Information Systems AmericaInventors: Kam W. Law, Nusrallah Jubran, Zbigniew Tokarski, Alan R. Katritzky, Ritu Jain, Rexiat Maimait
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Publication number: 20030113643Abstract: An organophotoreceptor that includes:Type: ApplicationFiled: September 27, 2002Publication date: June 19, 2003Applicant: SAMSUNG Electronics Co. Ltd.Inventors: Kam W. Law, Nusrallah Jubran, Zbigniew Tokarski
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Publication number: 20030113644Abstract: This invention relates to an organophotoreceptor that includes:Type: ApplicationFiled: October 31, 2002Publication date: June 19, 2003Applicant: SAMSUNG Electronics Co., Ltd.Inventors: Kam W. Law, Nusrallah Jubran, Zbigniew Tokarski
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Publication number: 20030104294Abstract: An organophotoreceptor that includes:Type: ApplicationFiled: September 13, 2002Publication date: June 5, 2003Applicant: SAMSUNG Electronics Co. Ltd.Inventors: Kam W. Law, Nusrallah Jubran, Zbigniew Tokarski, Alan R. Katritzky, Ritu Jain, Rexiat Maimait, Anatoliy V. Vakulenko
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Publication number: 20020119384Abstract: A light emitting device includes a substrate, and a light emitting element section formed over the substrate. The light emitting element section includes a first light emitting layer in which light is generated due to electroluminescence, one pair of electrode layers used to apply an electric field to the first light emitting layer, a second light emitting layer which absorbs light generated in the first light emitting layer and generates light having a longer wavelength than a wavelength of the absorbed light, and one pair of dielectric multilayer films which are formed under and above the second light emitting layer, respectively. A wavelength range of light which is reflected by the pair of dielectric multilayer films includes a wavelength range of light generated in the second light emitting layer.Type: ApplicationFiled: February 25, 2002Publication date: August 29, 2002Applicant: SEIKO EPSON CORPORATIONInventors: Tomoko Koyama, Takeo Kaneko
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Patent number: 6340548Abstract: Organic photoreceptors that include a charge transport compound, a charge generating compound, and an electroconductive support in which the charge transport compound is a novel aryl hydrazone-functional carbazole compound.Type: GrantFiled: March 16, 2000Date of Patent: January 22, 2002Assignee: Imation Corp.Inventors: Nusrallah Jubran, Zbigniew Tokarski, Terrance P. Smith
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Patent number: 6232466Abstract: A process for preparing a stable titanyl phthalocyanine crystal showing at least one diffraction peak at a Bragg angle (2&thgr;±0.2) of 27.3° is disclosed, which comprises treating amorphous or quasi-amorphous titanyl phthalocyanine with a solvent selected from an alcohol solvent, an aromatic solvent, a mixed solvent of an alcohol solvent and an aromatic solvent, or a mixed solvent of an alcohol solvent and water. The resulting titanyl phthalocyanine exhibits high photosensitivity and excellent durability as a photoconductive material of an electrophotographic photoreceptor.Type: GrantFiled: March 19, 1991Date of Patent: May 15, 2001Assignee: Fuji Xerox Co., LTDInventors: Katsumi Daimon, Akihiko Tokida, Katsumi Nukada, Hidemi Nukada, Yasuo Sakaguchi
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Patent number: 6139997Abstract: An electrophotographic photosensitive member is formed of a support, and a photosensitive layer disposed on the support. The photosensitive layer is characterized by containing an azo pigment having an organic group represented by formula (1) below: ##STR1## wherein X.sub.1, Z.sub.1, k.sub.1, B, A, R.sub.1 and R.sub.2 are defined in the text. The group of the formula (1) may provide at least one of up to 4 azo-substituents of the azo pigment having an entire structure represented byAr.paren open-st.N.dbd.N--Cp) 1-4,wherein Ar denotes an aromatic or heterocyclic core unit, Cp denotes a coupler residue group, and --(N.dbd.N--Cp) denotes such an azo-substituent. The photosensitive member can exhibit good electro-photographic performances including high and stable sensitivity on repetitive use.Type: GrantFiled: March 8, 1999Date of Patent: October 31, 2000Assignee: Canon Kabushiki KaishaInventors: Masato Tanaka, Kouichi Nakata
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Patent number: 6103435Abstract: An electrophotographic photoconductor includes an electroconductive support and a photoconductive layer formed thereon which contains a compound having a charge generating moiety and a charge transporting moiety in the molecule thereof. As such a compound for use in the electrophotographic photoconductor, various compounds having a charge generating moiety derived from an azo compound and a charge transporting moiety derived from a triarylamine compound are proposed. Bisazo and trisazo compounds serving as such compounds are also proposed, together with intermediates for producing the bisazo and trisazo compounds.Type: GrantFiled: May 17, 1999Date of Patent: August 15, 2000Assignee: Ricoh Company, Ltd.Inventors: Tomoyuki Shimada, Masaomi Sasaki, Chiaki Tanaka
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Patent number: 5998008Abstract: A developer carrying member is comprised of a substrate and a coat layer which covers the surface of the substrate. The coat layer contains at least a binder resin, conductive spherical particles having a number average particle diameter of from 0.3 .mu.m to 30 .mu.m and a true density of 3 g/cm.sup.3 or below, and a nitrogen-containing heterocyclic compound, the particles and the compound being dispersed in the binder resin.Type: GrantFiled: May 28, 1997Date of Patent: December 7, 1999Assignee: Canon Kabushiki KaishaInventors: Masayoshi Shimamura, Yasuhide Goseki, Kenji Fujishima, Michiko Orihara, Kazunori Saiki, Satoshi Otake
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Patent number: 5981124Abstract: An electrophotographic photoconductor includes an electroconductive support and a photoconductive layer formed thereon which contains a compound having a charge generating moiety and a charge transporting moiety in the molecule thereof. As such a compound for use in the electrophotographic photoconductor, various compounds having a charge generating moiety derived from an azo compound and a charge transporting moiety derived from a triarylamine compound are proposed. Bisazo and trisazo compounds serving as such compounds are also proposed, together with intermediates for producing the bisazo and trisazo compounds.Type: GrantFiled: November 24, 1995Date of Patent: November 9, 1999Assignee: Ricoh Company, Ltd.Inventors: Tomoyuki Shimada, Masaomi Sasaki, Chiaki Tanaka
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Patent number: 5843607Abstract: A photoconductive imaging member comprised of a charge transport layer comprised of an indolocarbazole represented by the Formulas (Ia), (IIa), (IIIa), (IVa), (Va), or (VIa); or optionally mixtures thereof: ##STR1## wherein R and R' are independently selected from the group consisting of a hydrogen atom, a halogen atom, alkyl, alkoxyl, and aryl; m and n are numbers of from 0 to 4; R.sup.1 and R.sup.2 are independently selected from the group consisting of alkyl, aryl, vinyl, and diarylaminoaryl; R.sup.3 and R.sup.4 are an atom of hydrogen, alkyl, alkoxy, aryl, or halogen, and p is a number of from 1 to 3.Type: GrantFiled: October 2, 1997Date of Patent: December 1, 1998Assignee: Xerox CorporationInventors: Nan-Xing Hu, Beng S. Ong
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Electrophotographic photosensitive member and apparatus and process cartridge provided with the same
Patent number: 5756248Abstract: An electrophotographic photosensitive member comprising a substrate and a photosensitive layer formed thereon, and the photosensitive layer contains an arylamine compound expressed by the following general formula (1): ##STR1## wherein R.sub.l is substituted or unsubstituted alkyl, aralkyl, alkaryl or aryl, R.sub.2 -R.sub.8 are each hydrogen, halogen, substituted or unsubstituted alkyl, alkoxy or amino, and Ar is alkyl, aryl or heterocyclic aryl.An electrophotographic apparatus includes the electrophotographic photosensitive member set forth above, a charging means, an exposure means, and a developing means.Type: GrantFiled: September 4, 1996Date of Patent: May 26, 1998Assignee: Canon Kabushiki KaishaInventors: Takakazu Tanaka, Toshihiro Kikuchi, Tetsuro Kanemaru, Kouichi Nakata -
Patent number: 5747205Abstract: A photoconductive imaging member comprised of a starburst aromatic amine compound of the formula ##STR1## wherein N is nitrogen; A.sup.1 to A.sup.3 each individually represent biaryl; R.sub.a, R.sub.b, and R.sub.c independently represent one of the groups of the following formulas ##STR2## wherein N is nitrogen; each Ar.sup.1 and Ar.sup.2 are aryl; R.sub.1 to R.sub.8 are substituents independently selected from the group consisting of hydrogen, halogen, hydrocarbon, and alkoxy; and X represents oxygen, sulfur, or an alkylene.Type: GrantFiled: February 27, 1997Date of Patent: May 5, 1998Assignee: Xerox CorporationInventors: Nan-Xing Hu, Ping Liu, Beng S. Ong
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Patent number: 5736284Abstract: A charge transporting material high in solubility in a binder polymer and having high carrier mobility is disclosed, which contains a carbazole derivative represented by the following general formula (1): ##STR1## wherein Ar.sup.1 and Ar.sup.2, which may be the same or different, each represents an aryl group which may have a substituent group; R.sup.1 and R.sup.2, which may be the same or different, each represents a lower alkyl group or an aryl group which may have a substituent group; R.sup.3 represents a lower alkyl group, an alicyclic alkyl group having 5 to 7 carbon atoms, an aryl group which may have a substituent group, or an aralkyl group which may have a substituent group; and m and n each represents an integer of 0 or 1. An electrophotographic photoreceptor containing the charge transporting material is also disclosed.Type: GrantFiled: April 15, 1997Date of Patent: April 7, 1998Assignee: Takasago International CorporationInventors: Tohru Kobayashi, Yoshimasa Matsushima, Hiroshi Sugiyama, Toshimitsu Hagiwara
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Patent number: 5707768Abstract: A diamine compound of the following formula (1): ##STR1## wherein R.sub.1 is a hydrogen atom, a lower alkyl group or a lower alkoxy group, each of A.sub.1, A.sub.2 and A.sub.3 which are independent of one another, is a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a group of the following formula (2): ##STR2## wherein R.sub.1 is as defined above, and X is a substituted or unsubstituted arylene group or a substituted or unsubstituted heterocyclic bivalent group.Type: GrantFiled: November 28, 1995Date of Patent: January 13, 1998Assignee: Hodogaya Chemical Co., Ltd.Inventors: Mitsutoshi Anzai, Atsushi Takesue, Takanobu Watanabe, Chieko Inayoshi
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Patent number: 5622799Abstract: An electrophotographic photosensitive member, a process cartridge having the electrophotographic photosensitive member and an electrophotographic apparatus are provided. The electrophotographic photosensitive member has a conductive substrate and a photosensitive layer thereon, wherein the photosensitive layer contains a disazo pigment represented by the following formula (1): ##STR1## wherein R.sub.1 to R.sub.8 are the same or different and are each a hydrogen atom, a halogen atom, an alkyl group or an alkoxy group, n is a positive integer, A.sub.1 and A.sub.2 are the same or different and are each a coupler residual group having a phenolic hydroxyl group, and at least one of A.sub.1 and A.sub.2 is a coupler residual group represented by the following formula (2): ##STR2## wherein X.sub.1 is a residual group forming a polycyclic aromatic ring or a heterocyclic ring by condensing with a benzene ring, R.sub.9 and R.sub.Type: GrantFiled: November 21, 1994Date of Patent: April 22, 1997Assignee: Canon Kabushiki KaishaInventors: Koichi Suzuki, Hideyuki Takai, Satomi Sugiyama, Mitsuhiro Kunieda
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Patent number: 5569749Abstract: An organic photoconductive material is represented by the following general formula [1]:A.sub.1 --N.dbd.N--B--N.dbd.N--A.sub.2 [1],wherein B is a divalent organic group bonded to nitrogen atoms forming azo groups, A.sub.1 and A.sub.2 are groups different from each other, A.sub.1 is represented by the following general formula [A1]: ##STR1## wherein X is an atomic group which is necessary for forming an aromatic hydrocarbon ring or an aromatic hetero-ring by condensation with the benzene ring, Y is a hydrogen atom, an alkyl group, an alkoxy group or a halogen atom, m is an integer of 1 to 4, R is an aromatic hydrocarbon ring group or an aromatic hetero-ring group and n is 1 or 2, and A.sub.2 is a group represented by one of the following general formulae [A2] and [A3]: ##STR2## wherein a.sub.1 is a group selected from R, --N.dbd.CH--R and ##STR3## R, X, Y, m and n are the same as those in the general formula [A1] and p is 0 or 1.Type: GrantFiled: January 18, 1996Date of Patent: October 29, 1996Assignee: Dainichiseika Color & Chemicals Mfg. Co., Ltd.Inventors: Hisao Kouno, Shyouichi Takahashi, Kazuhiro Higashide, Nakaji Komiyama, Osamu Suda, Masaru Hasegawa
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Patent number: 5527653Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer thereon. The photosensitive layer contains a disazo pigment having a 1,2-benzofluorenone as a central structure. A process cartridge and an electrophotographic apparatus containing the electrophotographic photosensitive member is also provided.Type: GrantFiled: September 29, 1994Date of Patent: June 18, 1996Assignee: Canon Kabushiki KaishaInventor: Masato Tanaka
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Patent number: 5501927Abstract: An electrophotographic photoreceptor including a light-sensitive layer containing a bisazo or trisazo compound represented by formula (I-1), (II-1), (III,1), (IV-1), (V-1) or (VI-1): ##STR1##Type: GrantFiled: June 23, 1993Date of Patent: March 26, 1996Assignee: Fuji Xerox Co., Ltd.Inventors: Akira Imai, Toru Ishii, Akihiko Tokida, Yutaka Akasaki
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Patent number: 5459247Abstract: Bisazo compounds useful as charge generating materials having formula (I) are disclosed: ##STR1## wherein R represents hydrogen, an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms or a nitro group.Type: GrantFiled: February 25, 1994Date of Patent: October 17, 1995Assignee: Ricoh Company, Ltd.Inventor: Mitsuru Hashimoto
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Patent number: 5422211Abstract: An imaging member comprised of supporting substrate, a photogenerator layer comprised of trisazo pigments as essentially represented by the formula (I), ##STR1## wherein X and Y are halogen, and Z is alkyl; and a charge transport layer.Type: GrantFiled: April 30, 1993Date of Patent: June 6, 1995Assignee: Xerox CorporationInventors: Kock-Yee Law, Ihor W. Tarnawskyi
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Patent number: 5415962Abstract: An electrophotographic photosensitive member is constituted by disposing a photosensitive layer on an electroconductive support. The photosensitive layer is characterized by containing a specific fluorene compound or by containing another specific fluorene compound and a specific triphenylamine compound. The photosensitive layer is suitable for providing an electrophotographic apparatus showing excellent electrophotographic characteristics such as a high photosensitivity, a good potential stability in repetitive use, a decreased transfer memory, no crack in the photosensitive layer and no crystallization of a charge-transporting material.Type: GrantFiled: April 20, 1993Date of Patent: May 16, 1995Assignee: Canon Kabushiki KaishaInventors: Tetsuro Kanemaru, Toshihiro Kikuchi, Akihiro Senoo, Takakazu Tanaka
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Patent number: 5411828Abstract: An electrophotographic photosensitive member is disclosed which has a photosensitive layer on a conductive support. The photosensitive layer contains an azo pigment of Formula (1):Ar--(--N.dbd.N--Cp).sub.n.Also, disclosed are an electrophotographic apparatus, a device unit, and a facsimile machine using the electrophotographic photosensitive member.Type: GrantFiled: February 4, 1993Date of Patent: May 2, 1995Assignee: Canon Kabushiki KaishaInventor: Yoshio Kashizaki
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Patent number: 5395715Abstract: The present invention relates to an improvement of a photosensitive member having a photosensitive layer which contains a specific amino compound as a charge transporting material.Type: GrantFiled: June 29, 1993Date of Patent: March 7, 1995Assignee: Minolta Camera Kabushiki KaishaInventors: Hideaki Ueda, Shigeaki Tokutake, Keiichi Inagaki, Yuki Shimada
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Patent number: 5376486Abstract: The present invention provides an electrophotographic photoreceptor high in sensitivity and endurance and highly resistant against oxidizing action with ozone or the like which comprises an electrically conductive support and, provided thereon, a light-sensitive layer which contains at least one azo compound containing a coupler component represented by the following formula [I] or [II]: ##STR1## wherein X represents a heterocyclic or aromatic ring residue which may have a substituent fusing with the benzene ring, Y represents a linkage group, R.sup.1 -R.sup.4 each represents a hydrogen atom or an alkyl group and R.sup.5 represents a hydrogen atom or an alkyl, aralkyl or acyl group which may have a substituent; ##STR2## wherein X and Y are as defined above and R.sup.6 and R.sup.7 each represents a hydrogen atom or an alkyl group which may have a substituent.Type: GrantFiled: June 14, 1993Date of Patent: December 27, 1994Assignee: Mitsubishi Paper Mills LimitedInventors: Akira Itoh, Hideki Nagamura
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Patent number: 5370954Abstract: An electrophotographic photoconductor is composed of an electroconductive support and a photoconductive layer formed thereon which contains a charge generating material and a charge transporting material. The charge generating material is composed of a particular triasazo compound and a particular disazo compound. A photoconductive composition useful as a photoconductive material is also composed of the trisazo compound and the disazo compound.Type: GrantFiled: April 16, 1993Date of Patent: December 6, 1994Assignee: Ricoh Company, Ltd.Inventors: Katsuichi Ohta, Masaomi Sasaki, Mitsuru Hashimoto, Kazuya Ishida, Tomoyuki Shimada
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Patent number: 5356742Abstract: An electrophotographic photoconductor is composed of an electroconductive substrate and a photoconductive layer formed thereon, the photoconductive layer includes a dipyrenylamine derivative of formula (I): ##STR1## wherein R represents an alkyl group with 1 to 12 carbon atoms, which may have a substituent, or an aryl group which may have a substituent. Novel dipyrenylamine derivatives of formula (I), in which R is --ph--(R.sup.4)n, wherein, ph is a phenyl group, R.sup.4 is hydrogen, an unsubstituted or substituted alkyl group having 1 to 12 carbon atoms, an unsubstituted or substituted alkoxyl group having 1 to 12 carbon atoms, n is an integer of 1 to 5, and when n is 2 to 5, R.sup.4 may be the same or different, which are for use in the photoconductive layer of the electrophotographic photoconductor, are synthesized.Type: GrantFiled: February 28, 1992Date of Patent: October 18, 1994Assignee: Ricoh Company, Ltd.Inventors: Tomoyuki Shimada, Masaomi Sasaki, Tamotsu Aruga, Hiroshi Adachi
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Patent number: 5344736Abstract: An electrophotographic photoreceptor is provided with a photosensitive layer, which contains an azo compound represented by the following g general formula (1): ##STR1## wherein A means a coupler residuum having phenolic OH radicals, R.sub.1 and R.sub.2 designate, respectively, a radical of an integer of, both, m=0.about.4, n =0.about.4, selected from the group consisting of hydrogen, halogen atoms, alkyl group, alkoxy group, and di-substituted amino group.The electrophotographic photoreceptor of this invention has excellent electrification characteristics, sensitivity characteristics and image-forming property as well as good sensitivity. In addition, its sensitivity and electrification characteristics undergo less variations even when employed repeatedly. It also undergoes little light-induced fatigue. It has high weatherability.Type: GrantFiled: March 2, 1993Date of Patent: September 6, 1994Assignee: Dainichiseika Color & Chemicals Mfg. Co., Ltd.Inventors: Nakaji Komiyama, Hisao Kouno, Kazuhiro Higashide, Osamu Suda, Masaru Hasegawa
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Patent number: 5316881Abstract: The photoconductor for electrophotography comprises an electroconductive substrate and a photosensitive layer formed on the substrate. The photosensitive layer may be a monolayer or function-separated laminate type one which comprise a charge generating layer and a charge transporting layer laminated one on another. The charge generating layer contains a specified benzidine compound represented by general formula (I) below as the charge transporting substance. ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4, which are the same or different, each represent independently an aryl group, an alkylaryl group, an alkoxyaryl group or a halogenated aryl group provided that R.sub.1 and R.sub.2, or R.sub.3 and R.sub.4, or both combine and form a condensed aromatic group with the nitrogen atom to which they are bonded, respectively; R.sub.5 and R.sub.6 each represent independently a hydrogen atom, an alkyl group, an alkoxy group, or a halogen atom.Type: GrantFiled: December 18, 1992Date of Patent: May 31, 1994Assignee: Fuji Electric Co., Ltd.Inventors: Yoichi Nakamura, Nobuyoshi Mori, Sumitaka Nogami
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Patent number: 5306586Abstract: An electrophotographic imaging member including a charge generating layer and a heterogeneous charge transport layer, the charge transport layer having regions of charge transport and inactive regions and the charge transporting regions are in contact with each other. This imaging member has characteristics that enable high quality and high contrast imaging.Type: GrantFiled: August 6, 1992Date of Patent: April 26, 1994Assignee: Xerox CorporationInventors: Damodar M. Pai, Andrew R. Melnyk, Milan Stolka
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Patent number: 5298661Abstract: Charge transporting materials having general formula (I): ##STR1## R.sup.1 represents hydrogen; an unsubstituted or substituted alkyl group; an alkoxyl group having 1 to 4 carbon atoms; a thioalkoxyl group having 1 to 4 carbon atoms; an aryloxy group; an aralkyl group; a nitro group; an unsubstituted or substituted aryl group; a halogen; an amino group; an unsubstituted or substituted dialkylamino group; R.sup.2 represents hydrogen; an unsubstituted or substituted alkyl group; an alkoxyl group having 1 to 4 carbon atoms; or a halogen; R.sup.3 represents hydrogen; an alkyl group having 1 to 4 carbon atoms; an alkoxyl group having 1 to 4 carbon atoms; a halogen; a dialkylamino group; an amino group; a thioalkoxyl group having 1 to 4 carbon atoms; an aryloxy group; a methylenedioxy group; an aralkyl group; or an unsubstituted or substituted aryl group; R.sup.Type: GrantFiled: June 18, 1993Date of Patent: March 29, 1994Assignee: Ricoh Company, Ltd.Inventors: Tomoyuki Shimada, Masaomi Sasaki, Tamotsu Aruga
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Patent number: 5286589Abstract: An electrophotographic photosensitive member has a photosensitive layer on an electroconductive support. The photosensitive layer comprises a compound having a structure represented by the general formula (1) or (2) as a charge-generating material: ##STR1## wherein A.sub.1 and A.sub.3 are respectively an alkyl radical, an aralkyl radical, an aromatic radical or a heterocyclic radical which may have a substituent; A.sub.2 is hydrogen atom, or an alkyl radical, an aralkyl radical, an aromatic radical, or a heterocyclic radical which may have a substituent; A.sub.1 and A.sub.2 may be the same with or different from each other; A.sub.1 and A.sub.2 may be linked together to form a ring; and n is an integer of 1, 2, or 3.Type: GrantFiled: November 12, 1992Date of Patent: February 15, 1994Assignee: Canon Kabushiki KaishaInventors: Shintetsu Go, Kazushi Iuchi, Toshie Miyaji, Hajime Miyazaki, Hideyuki Takai, Masakazu Matsumoto
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Patent number: 5283144Abstract: A photoreceptor includes a charge generating layer having: 1) a photogenerating pigment purified by sublimation at a pressure not greater than 10.sup.-3 Torr and subsequent condensation of the photogenerating pigment at a temperature less than about 100.degree. C.; and 2) a film-forming binder.Type: GrantFiled: September 2, 1992Date of Patent: February 1, 1994Assignee: Xerox CorporationInventors: Anthony T. Ward, George Liebermann, Ah-Mee Hor, Giuseppa Baranyi, Donald J. Teney
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Patent number: 5268246Abstract: An electrophotographic photoconductor is composed of an electroconductive support and a photoconductive layer formed thereon comprising a novel pyrene-ring-containing olefin compound having formula [I]: ##STR1## wherein R.sup.1 and R.sup.2 each represent hydrogen or an alkyl group which may have a substituent; Y is an aliphatic hydrocarbon group which may have a substituent, a cyclic hydrocarbon group which may have a substituent, or an aromatic group which may have a substituent; n is an integer of 0 or 1, and m is an integer of 1 to 3, provided that when n is 0, m is 1, R.sup.1 is hydrogen, and Y is an aromatic group with a substituent ##STR2## R.sup.5 and R.sup.3 each represent hydrogen, and Y and R.sup.1 may be bonded to form a ring, a method of synthesizing the pyrene-ring-containing olefin compound and an intermediate therefor are disclosed.Type: GrantFiled: April 9, 1991Date of Patent: December 7, 1993Assignee: Ricoh Company, Ltd.Inventors: Tamotsu Aruga, Masaomi Sasaki, Tomoyuki Shimada, Hiroshi Adachi