As A Nitrogen- Or Phosphorus-containing Polymer Patents (Class 430/108.22)
-
Publication number: 20110229811Abstract: The invention provides a toner for developing an electrostatic image including toner particles having a shape factor SF1 of 110 or more and including a binder resin, and particles of an external additive that adhere to the toner particles, wherein the particles of the external additive including first particles, and second particles which are adhered to the first particles and have a primary particle size of 0.2 times to 0.5 times as large as that of the first particles, and in an image obtained by observing the particles of the external additive with a microscope, when the projection surface area of the first particle is defined as S1 and the total of the projection surface areas of the second particles which are not hidden by the first particle is defined as S2, S2 being from 0.1 times to 0.5 times as large as S1.Type: ApplicationFiled: August 9, 2010Publication date: September 22, 2011Applicant: FUJI XEROX CO., LTD.Inventors: Yutaka SAITO, Michio Take, Yoshifumi Iida, Sakon Takahashi, Motoko Sakai, Katsuyuki Kitajima
-
Publication number: 20110177447Abstract: The present invention provides a toner containing base particles formed by emulsifying or dispersing, in an aqueous medium, a toner composition liquid which is obtained by dissolving or dispersing, in an organic solvent, at least a binder resin soluble in the organic solvent and a colorant masterbatch containing a colorant and a colorant dispersion resin, wherein the colorant dispersion resin is a resin having sparing solubility defined below: where the “sparing solubility” means that when 4 parts by mass of the colorant dispersion resin are added to and mixed with 10 parts by mass of the organic solvent, the mixture becomes white turbid at 25° C. or becomes a transparent solution once at 25° C. and then becomes white turbid within 12 hours.Type: ApplicationFiled: January 13, 2011Publication date: July 21, 2011Inventors: Kazumi Suzuki, Tatsuya Morita
-
Patent number: 7960085Abstract: A method for producing a positively chargeable toner is described. The method for producing a positively chargeable toner may include the steps of: mixing and emulsifying a charge-controlling resin having a positive polar group, an organic solvent and an aqueous medium to form an emulsion, and then removing the organic solvent from the emulsion, to thereby form a suspension of the charge-controlling resin having a positive polar group in the range of 5.0×10?5 to 6.0×10?4 mol/g; mixing the suspension of the charge-controlling agent with a suspension of toner base particles containing a binder resin and a colorant, to thereby form a mixture; and heating the mixture containing the suspension of the toner base particles and the suspension of the charge-controlling resin, to thereby fix the charge-controlling resin on the surfaces of the toner base particles.Type: GrantFiled: January 31, 2008Date of Patent: June 14, 2011Assignee: Brother Kogyo Kabushiki KaishaInventors: Masateru Kawamura, Jun Ikami
-
Publication number: 20110123920Abstract: The present invention is toner particle that includes a continuous phase of binder polymer and a second phase of hydrocolloid. The particle has a porosity of at least 10 percent.Type: ApplicationFiled: December 7, 2010Publication date: May 26, 2011Inventors: Mridula Nair, Xiqiang Yang, Tamara K. Jones, Jason Morgan
-
Publication number: 20110053063Abstract: A toner is provided including a core particle comprising a binder resin, a colorant, and a release agent, and a shell layer comprising particles of a vinyl resin. The vinyl resin comprises 80% by weight or more of a unit of an aromatic compound having a vinyl-polymerizable functional group. A method of manufacturing the above toner is also provided, including steps of dissolving or dispersing the binder resin, the colorant, and the release agent in an organic solvent to prepare an oily liquid, dispersing the oily liquid in an aqueous medium to prepare the core particles, and adhering particles of a vinyl resin to the surfaces of the core particles to form shell layers.Type: ApplicationFiled: August 11, 2010Publication date: March 3, 2011Inventors: Takuya KADOTA, Yoshihiro MIKURIYA, Tsuyoshi NOZAKI, Atsushi YAMAMOTO, Yoshimichi ISHIKAWA, Tomohiro FUKAO, Tomoharu MIKI
-
Publication number: 20110045398Abstract: A black toner has a toner particle including at least a resin (a) having a polyester as a main component, carbon black, and a wax, and a fine inorganic particle. When the Tgs of the black toner measured by DSC at temperature rise rate of 0.5° C./min and 4.0° C./min are defined as Tg(0.5) and Tg(4.0) respectively, Tg(0.5) is 35.0 to 60.0° C. and the difference between Tg(4.0) and Tg(0.5) is 2.0 to 10.0° C. When preparing a solution of which the black toner is dissolved in ethyl acetate and defined the concentration thereof as Cb1 (mg/mL) and the light absorbance thereof at 600 nm wavelength as A600, A600/Cb1 is less than 0.15. When preparing a solution of which the black toner is dissolved in chloroform and defined the concentration thereof as Cb2 (mg/mL) and the light absorbance thereof at 600 nm wavelength as A600, A600/Cb2 is 2.00 to 6.55.Type: ApplicationFiled: February 19, 2010Publication date: February 24, 2011Applicant: CANON KABUSHIKI KAISHAInventors: Ayako Sekikawa, Atsushi Tani, Takaaki Kaya, Shigeto Tamura, Makoto Kambayashi
-
Publication number: 20110039200Abstract: A yellow toner is provided which can form high-quality images and has high offset resistance and excellent charging performance while being a capsule-type toner having excellent low-temperature fixability. The yellow toner satisfies, in DSC measurement, 40.0?Tg(0.5)?60.0 and 2.0?Tg(4.0)?Tg(0.5)?10.0, wherein when the concentration of the yellow toner in an ethyl acetate dispersion is Cy1 (mg/ml) and the light absorbance at a wavelength of 422 nm of the dispersion is A(ethyl acetate)422, the relationship between Cy1 and A(ethyl acetate)422 satisfies A(ethyl acetate)422/Cy1<0.45, and when the concentration of the yellow toner in a chloroform solution is Cy2 (mg/ml) and the light absorbance at a wavelength of 422 nm of the solution is A(chloroform)422, the relationship between Cy2 and A(chloroform)422 satisfies 6.00<A(chloroform)422/Cy2<14.4.Type: ApplicationFiled: February 9, 2010Publication date: February 17, 2011Applicant: CANON KABUSHIKI KAISHAInventors: Takaaki Kaya, Ayako Sekikawa, Atsushi Tani, Shigeto Tamura
-
Publication number: 20110039199Abstract: A toner having a core with a first latex having a specific glass transition temperature, and further having a shell surrounding the core with a second latex having a specific glass transition temperature and possessing functional groups, and processes for producing the same.Type: ApplicationFiled: August 24, 2010Publication date: February 17, 2011Applicant: XEROX CORPORATIONInventors: Zhen Lai, Yuhua Tong, Chieh-Min Cheng, Peter V. Nguyen, Jon T. Owens
-
Patent number: 7881648Abstract: To provide a positive charge control resin with which an electrophotographic functional component part coming into contact with a toner can be made chargeable in a polarity reverse to the polarity of the toner, and which has superior dispersibility in, and compatibility with, a main binder. The present invention is a positive charge control resin having a copolymer obtained by polymerizing specific acrylate or methacrylate monomer, amino-group-containing monomer(s) and carboxyl-group-containing monomer(s) as copolymerization components.Type: GrantFiled: May 29, 2006Date of Patent: February 1, 2011Assignee: Canon Kasei Kabushiki KaishaInventors: Tatsurou Yoshida, Eri Yagi
-
Patent number: 7862970Abstract: A toner composition includes core particles including a polymeric latex and an optional colorant, and amino-containing polymer particles dispersed on an external surface of the particles.Type: GrantFiled: May 13, 2005Date of Patent: January 4, 2011Assignee: Xerox CorporationInventors: Michael S. Hawkins, Eric M. Strohm, Richard P. N. Veregin, Vladislav Skorokhod, Clive R. Daunton, Robert D. Bayley
-
Publication number: 20100323290Abstract: A toner for an electrophotography and its manufacturing method are disclosed. The toner comprises toner particles containing a cross-linked polymer having two-valent crosslinking group represented by Formula (1), wherein, R1 is a hydrogen atom or a chlorine atom, R2 is a hydrogen atom, a chlorine atom or a methoxy group. The toner satisfies storage durability against heat as well as sufficient low temperature fixing ability.Type: ApplicationFiled: June 10, 2010Publication date: December 23, 2010Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Mikio KOUYAMA, Ken OHMURA, Kenji HAYASHI, Yukio HOSOYA, Hiroaki OBATA, Koji SHIBATA
-
POLYMER HAVING A SULFONIC GROUP OR A SULFONATE GROUP AND AN AMIDE GROUP AND METHOD OF PRODUCING SAME
Publication number: 20100233610Abstract: A polymer is provided in which a sulfonic group or a derivative thereof is introduced. The polymer includes a unit represented by the following chemical formula (1): wherein R represents -A1-SO2R1; A1 is selected from an alkylene group, a heterocyclic ring, an aromatic ring; and —SO2R1 is a sulfonic group or of a derivative of a sulfonic acid.Type: ApplicationFiled: May 20, 2010Publication date: September 16, 2010Applicant: CANON KABUSHIKI KAISHAInventors: Tatsuki Fukui, Takashi Kenmoku, Ako Kusakari, Chieko Mihara, Tetsuya Yano, Norikazu Fujimoto -
Patent number: 7794909Abstract: An object of the present invention is to provide a spherical toner that has a sharp particle size distribution and a small particle diameter. This is a capsule-type toner that exhibits an excellent low-temperature fixability, while at the same time having a high offset resistance and excellent charging properties and having the ability to provide a high-quality image in which the characters, lines, and dots are precisely defined. The object is achieved by a toner comprising a toner particle that comprises at least (a) resin having polyester as the main component, colorant, wax, and (b) urethane resin, wherein the hydroxyl value per specific surface area of the toner particle is fall into the specific range, and wherein a Tg(0.5) and a Tg(4.0)-Tg(0.5) of the toner fall into specific range.Type: GrantFiled: July 6, 2009Date of Patent: September 14, 2010Assignee: Canon Kabushiki KaishaInventors: Takaaki Kaya, Shigeto Tamura, Ryoichi Fujita, Ayako Sekikawa, Makoto Kambayashi
-
Patent number: 7718338Abstract: A charge control resin containing a copolymer which has a unit having a sulfonic acid ester group having a specific structure and has the unit in specific proportions. The charge control resin can provide a toner with superior charging performance. Also disclosed is a toner having such a charge control resin.Type: GrantFiled: March 24, 2006Date of Patent: May 18, 2010Assignee: Canon Kabushiki KaishaInventors: Norikazu Fujimoto, Yasukazu Ayaki, Shigeto Tamura, Tetsuya Yano
-
Publication number: 20100092884Abstract: Single component toners are provided with at least one surface additive including a large polymeric spacer, and processes for producing the same. In embodiments, the toner is a non-magnetic single component toner produced by emulsion aggregation methods. The large polymeric spacer additives provide excellent flow characteristics to the resulting toners, and reduce the incidence of clogging failure and print defects such as ghosting, white bands, and low toner density compared with conventionally produced toners.Type: ApplicationFiled: October 15, 2008Publication date: April 15, 2010Applicant: XEROX CORPORATIONInventors: Samir Kumar, Grazyna L. Kmiecik-Lawrynowicz, Maura A. Sweeney, Michael L. Grande, Julie C. Pickering, Timothy L. Lincoln
-
Publication number: 20100015543Abstract: A black toner includes: toner mother particles containing carbon black as a colorant and a binder resin, the toner mother particles being surface-modified with a polyalkyleneimine.Type: ApplicationFiled: June 30, 2009Publication date: January 21, 2010Applicant: SEIKO EPSON CORPORATIONInventors: Masahiro Oki, Yoshihiro Ueno
-
Patent number: 7638250Abstract: A toner is provided including a colorant; a binder resin (A) which is a polyester resin having no tetrahydrofuran insoluble component, and having a molecular weight distribution such that components having a molecular weight of not greater than 500 are included in an amount of not greater than 4% by weight and a peak is present in a molecular weight range of from 3,000 to 9,000 when measured by gel permeation chromatography (GPC); and a binder resin (B) which is a polyester resin having no tetrahydrofuran insoluble component, and including units of a polycarboxylic acid and a diol having the specific formula; wherein at least one of the binder resins (A) and (B) is prepared in the presence of the specific titanium-containing catalyst, and wherein a weight ratio ((A)/(B)) of the binder resin (A) to the binder resin (B) is from 60/40 to 85/15.Type: GrantFiled: March 14, 2007Date of Patent: December 29, 2009Assignee: Ricoh Company LimitedInventors: Takahiro Honda, Hiroyuki Fushimi, Osamu Uchinokura
-
Publication number: 20090170018Abstract: There is provided a toner for developing a latent electrostatic image, obtained by a method containing: ejecting a toner composition fluid from an ejection hole so as to make the toner composition fluid into droplets; and solidifying the droplets in an atomizing space so as to form solid particles, wherein the toner composition fluid contains at least a colorant formed by reacting a polymer containing 10 mol % or more of a monomer unit having a sulfonic acid group or a salt thereof, or a monomer unit having a sulfuric acid group or a salt thereof as a constitutional unit, and a basic dye.Type: ApplicationFiled: December 23, 2008Publication date: July 2, 2009Inventors: Shinichi KURAMOTO, Shinji OHTANI, Yoshihiro NORIKANE
-
Publication number: 20090170019Abstract: To provide a toner for developing an electrostatic charge image, the toner containing at least a colorant obtained by reacting a polymer with a basic dye, wherein the polymer contains 10 mol % or more of a monomer unit having any one of a sulfonic acid group, a sulfonic acid salt group, a sulfuric acid group and a sulfuric acid salt group as a constitutional unit, and the toner is obtained by forming a toner composition liquid containing at least the colorant into oil droplets in an aqueous medium, and solidifying the oil droplets into solid particles.Type: ApplicationFiled: December 23, 2008Publication date: July 2, 2009Inventors: Shinichi Kuramoto, Shinji Ohtani
-
Patent number: 7547497Abstract: A toner which is negatively charged to develop an electrostatic latent image is provided that contains a colorant; and a binder resin, wherein the toner has an acid value of from 5 to 20 mg KOH/g and an amine value of from 0.5 to 10 mg KOH/g.Type: GrantFiled: March 16, 2005Date of Patent: June 16, 2009Assignee: Ricoh Company, Ltd.Inventors: Osamu Uchinokura, Masami Tomita, Hisashi Nakajima, Shinya Nakayama, Koichi Sakata, Akihiro Kotsugai, Tomoyuki Ichikawa, Yasuo Asahina, Hideki Sugiura, Yasuaki Iwamoto, Satoshi Mochizuki
-
Patent number: 7524599Abstract: A toner composition includes core toner particles and a shell formed over the core toner particles. The core toner particles include a resin substantially free of cross linking, an optional cross linked resin, a polyester resin, and a colorant. The shell includes a resin containing charge control agent recurring units.Type: GrantFiled: March 22, 2006Date of Patent: April 28, 2009Assignee: Xerox CorporationInventors: Daryl W. Vanbesien, Cuong Vong, Karen A. Moffat, Richard P. N. Veregin
-
Publication number: 20090104555Abstract: The present invention provides a toner containing at least a binder resin and a pigment, wherein the amount of the pigment in the toner is 3.0% by mass to 8.5% by mass, the volume average particle diameter of the toner is 2.0 ?m to 6.0 ?m, and a monochrome image, which has been fixed on a recording medium so that the amount of the toner adhered onto the recording medium is 0.25 mg/cm2, has a reflection density of 1.2 to 2.5.Type: ApplicationFiled: October 6, 2008Publication date: April 23, 2009Inventors: Shinichi Wakamatsu, Hiroshi Yamashita, Naohiro Watanabe, Tsuyoshi Sugimoto
-
Patent number: 7514194Abstract: The invention provides a toner for developing electrostatic latent images containing at least a binder resin, a colorant, a releasing agent, and a graft polymer that has been made by graft polymerization of a resin matrix and a macromonomer including at least one group selected from the group consisting of a hydroxyl group, a hydroxyalkyl group, and a pyrolidonyl group, and a production method thereof. The invention further provides an electrostatic latent image developer using the toner, an image forming method using the toner, and an image forming apparatus.Type: GrantFiled: December 19, 2005Date of Patent: April 7, 2009Assignee: Fuji Xerox Co., Ltd.Inventors: Masakazu Iijima, Takao Ishiyama, Masaaki Suwabe, Yasuo Kadokura, Michio Take, Hiroshi Nakazawa
-
Publication number: 20080241723Abstract: Emulsion aggregation toner particles comprising at least one binder resin and a colorant, wherein the colorant comprises at least one ceramic pigment.Type: ApplicationFiled: March 26, 2007Publication date: October 2, 2008Applicant: XEROX CORPORATIONInventors: Grazyna E. KMIECIK-LAWRYNOWICZ, Maura A. SWEENEY, Robert D. BAYLEY
-
Patent number: 7393912Abstract: A polyhydroxyalkanoate containing in a molecule at least one unit represented by the chemical formula (1). The polyhydroxyalkanoate is a biodegradable plastic with enhanced melt-processability and exhibits excellent charging stability, high chargeability, and enhanced dispersibility when used as a charge control agent of a toner in an electrophotographic process. (R denotes -A1(—SO2R1)x. R1 is selected from OH, a halogen atom, ONa, OK, and OR1a. R1a and A1 are selected from a substituted or unsubstituted aliphatic hydrocarbon structure, a substituted or unsubstituted aromatic ring structure, and a substituted or unsubstituted heterocyclic structure. Further, m and x are integers selected from 1 to 8, and when two or more units exist, each of R, R1R1a, A1, m, and x is defined as above independently for each of the units.Type: GrantFiled: June 23, 2005Date of Patent: July 1, 2008Assignee: Canon Kabushiki KaishaInventors: Chieko Mihara, Tetsuya Yano, Shinya Kozaki, Tsutomu Honma, Takashi Kenmoku, Tatsuki Fukui, Ako Kusakari
-
Publication number: 20080118854Abstract: A charge control resin containing a copolymer which has a unit having a sulfonic acid ester group having a specific structure and has the unit in specific proportions. The charge control resin can provide a toner with superior charging performance. Also disclosed is a toner having such a charge control resin.Type: ApplicationFiled: March 24, 2006Publication date: May 22, 2008Applicant: CANON KABUSHIKI KAISHAInventors: Norikazu Fujimoto, Yasukazu Ayaki, Shigeto Tamura, Tetsuya Yano
-
Patent number: 7374846Abstract: The present invention relates to a non-magnetic monocomponent color toner composition and a method for preparing the same, and more particularly to a non-magnetic monocomponent color toner composition having a narrow charge distribution, good charging characteristics, good environmental independence, superior image characteristics, high transfer efficiency and long-term stability caused by significantly improved charge maintenance capability, and a method for preparing the same. The non-magnetic monocomponent color toner composition of the present invention is prepared by coating organic particles having an average particle size of 0.3 to 2.0 ?m, organic particles having an average particle size of 0.05 to 0.25 ?m, and silica on toner mother particles.Type: GrantFiled: October 21, 2005Date of Patent: May 20, 2008Assignee: LG Chem, Ltd.Inventors: Hyeung-Jin Lee, Tae-Hee Yoon, Joo-Yong Park, Chang-Soon Lee
-
Patent number: 7348117Abstract: A toner including toner particles comprising a binder resin; and at least two kinds of particulate resins which are located on at least a surface of the toner particles, wherein the toner satisfies at least one of the following relationships (TgA-TgB)?20° C., wherein TgA and TgB represent glass transition temperatures (Tg) of a particulate resin (A) having a highest Tg and a particulate resin (B) having a lowest Tg among the at least two kinds of particulate resins, respectively; and 100,000?Mwc?6,000,000 and 8,000?Mwd?800,000, wherein Mwc and Mwd represent weight average molecular weights (Mw) of a particulate resin (C) having a highest Mw and a particulate resin (D) having a lowest Mw among the at least two kinds of particulate resins, respectively, wherein Mwc>Mwd.Type: GrantFiled: August 4, 2004Date of Patent: March 25, 2008Assignee: Ricoh Company LimitedInventors: Ryohta Inoue, Naohiro Watanabe, Masahide Yamada, Sonoh Matsuoka, Chiaki Tanaka, Takeshi Takada, Masahiro Ohki, Akinori Saitoh
-
Publication number: 20080070142Abstract: The invention provides a toner for electrostatic charge development including a binder resin and an infrared absorber, wherein at least one of the infrared absorbers is a compound represented by Structural Formula (1).Type: ApplicationFiled: February 12, 2007Publication date: March 20, 2008Applicant: FUJI XEROX CO., LTD.Inventors: Makoto Furuki, Minquan Tian, Miho Watanabe, Takashi Matsubara
-
Patent number: 7323281Abstract: A toner comprising toner particles comprising a first binder resin; a second binder resin different from said first binder resin and having a glass transition temperature of from 40 to 55° C.; a colorant; and a release agent, and a particulate resin material which is located on surface of the toner particles with a coverage of from 50 to 100%, and which has a glass transition temperature of from 50 to 90° C., wherein a weight ratio (W2/W1) between the second binder resin (W2) and the first binder resin (W1) is from 5/95 to 40/60, and wherein a ratio (G?80/G?180) between a storage modulus of the toner at 80° C. (G?80) and a storage modulus at 180° C. (G?180) is from 100 to 1,000.Type: GrantFiled: September 29, 2006Date of Patent: January 29, 2008Assignee: Ricoh Company, Ltd.Inventors: Shigeru Emoto, Shinichiro Yagi, Naohito Shimota, Maiko Kondo, Fumihiro Sasaki, Toshiki Nanya, Hiroto Higuchi, Masami Tomita, Tomoyuki Ichikawa
-
Patent number: 7314695Abstract: A toner for developing electrostatic charge images that exhibits superior fixability at low temperature so as to realize satisfactory fixing performance even with less energy, that exhibits high stress resistance so as to be free from blade contamination by molten toner, and that exhibits excellent performances in any environmental conditions. In particular, a toner for developing an electrostatic charge images, comprising at least a binder resin, a colorant and a charge control agent, wherein a low-molecular-weight polymer having functional groups is used at least as the charge control agent and a cycloolefin copolymer resin is used at least as the binder resin.Type: GrantFiled: April 10, 2003Date of Patent: January 1, 2008Assignees: Tomoegawa Paper Co., Ltd, Ticona GmbHInventors: Yoshiaki Harada, Toru Nakamura
-
Publication number: 20070218389Abstract: A toner is provided including a colorant; a binder resin (A) which is a polyester resin having no tetrahydrofuran insoluble component, and having a molecular weight distribution such that components having a molecular weight of not greater than 500 are included in an amount of not greater than 4% by weight and a peak is present in a molecular weight range of from 3,000 to 9,000 when measured by gel permeation chromatography (GPC); and a binder resin (B) which is a polyester resin having no tetrahydrofuran insoluble component, and including units of a polycarboxylic acid and a diol having the specific formula; wherein at least one of the binder resins (A) and (B) is prepared in the presence of the specific titanium-containing catalyst, and wherein a weight ratio ((A)/(B)) of the binder resin (A) to the binder resin (B) is from 60/40 to 85/15.Type: ApplicationFiled: March 14, 2007Publication date: September 20, 2007Inventors: Takahiro Honda, Hiroyuki Fushimi, Osamu Uchinokura
-
Patent number: 7179575Abstract: A toner includes particles of a resin, an optional colorant, a first crystalline polymeric wax and a second crystalline polymeric wax, where the first crystalline polymeric wax is a crystalline polyethlene wax, the second crystalline polymeric wax is selected from aliphatic polar amide functionalized waxes, carboxylic acid-terminated polyethylene waxes, aliphatic waxes consisting of esters of hydroxylated unsaturated fatty acids, high acid waxes, and mixtures thereof, and the toner particles are prepared by an emulsion aggregation process.Type: GrantFiled: June 28, 2004Date of Patent: February 20, 2007Assignee: Xerox CorporationInventors: Karen A. Moffat, David J. Sanders, Enno E. Agur, Daryl W. Vanbesien
-
Patent number: 7160661Abstract: A toner including particles of a resin, an optional colorant, and a crystalline wax, where the crystalline wax is selected from aliphatic polar amide functionalized waxes, carboxylic acid-terminated polyethylene waxes, aliphatic waxes consisting of esters of hydroxylated unsaturated fatty acids, high acid waxes, and mixtures thereof, is prepared by an emulsion aggregation process.Type: GrantFiled: June 28, 2004Date of Patent: January 9, 2007Assignee: Xerox CorporationInventors: Karen A. Moffat, Daryl W. Vanbesien, Enno E. Agur, Chu-heng Liu, David J. Sanders
-
Patent number: 7157199Abstract: A toner comprising toner particles comprising a first binder resin; a second binder resin different from said first binder resin and having a glass transition temperature of from 40 to 55° C.; a colorant; and a release agent, and a particulate resin material which is located on surface of the toner particles with a coverage of from 50 to 100%, and which has a glass transition temperature of from 50 to 90° C., wherein a weight ratio (W2/W1) between the second binder resin (W2) and the first binder resin (W1) is from 5/95 to 40/60, and wherein a ratio (G?80/G?180) between a storage modulus of the toner at 80° C. (G?80) and a storage modulus at 180° C. (G?180) is from 100 to 1,000.Type: GrantFiled: December 1, 2003Date of Patent: January 2, 2007Assignee: Ricoh Company, Ltd.Inventors: Shigeru Emoto, Shinichiro Yagi, Naohito Shimota, Maiko Kondo, Fumihiro Sasaki, Toshiki Nanya, Hiroto Higuchi, Masami Tomita, Tomoyuki Ichikawa
-
Patent number: 7090954Abstract: In order to control the filming, a developer comprises developer primary particles, each comprising at least a resin and a colorant and an additive agent added to the developer primary particles and having a particle diameter smaller than that of the developer primary particles, wherein an extrication amount of the additive agent in the developer primary particles is smaller than 5.2×10?5 part by weight with respect to the developer primary particles.Type: GrantFiled: February 24, 2003Date of Patent: August 15, 2006Assignee: Oki Data CorporationInventors: Toru Ishihara, Kenji Koido
-
Patent number: 6953646Abstract: A toner comprises toner particles comprising at least a binder resin, a colorant, and a sulfur-containing resin, in which the toner particles comprise the sulfur-containing resin so as to satisfy a relation of; 0.50?IS/TS?0.95 where TS denotes a content of sulfur in the toner particles, and IS denotes a content of sulfur in isopropyl alcohol insoluble components of the toner particles, whereby it is possible to obtain a high quality image having an excellent developing resistance regardless of the surrounding conditions and a uniform charge amount distribution regardless of processing speed.Type: GrantFiled: May 14, 2003Date of Patent: October 11, 2005Assignee: Canon Kabushiki KaishaInventors: Tadashi Doujo, Yuichi Mizoh, Nene Shibayama, Yusuke Hasegawa
-
Patent number: 6936390Abstract: A toner for developing an electrostatic image, including a colorant, a binder resin comprising a modified polyester, and fine resin particles having a weight average particle diameter of 50 to 300 nm and being present on an outer surface of the toner, wherein the toner has a BET specific surface area of 1.5 to 4.0 m2/g.Type: GrantFiled: March 24, 2003Date of Patent: August 30, 2005Assignee: Ricoh Company, Ltd.Inventors: Toshiki Nanya, Masami Tomita, Shigeru Emoto, Hiroshi Yamada, Shinichiro Yagi, Naohiro Watanabe, Tadao Takigawa
-
Patent number: 6911520Abstract: Provided is a polyhydroxyalkanoate containing in a molecule thereof one or more units each selected from the following formulae (1) (2), (3) and (4): wherein R1 and R6 are each OH, halogen, ONa, OK, OCH3 or OC2H5; A1 and J6 are each a substituted or unsubstituted aliphatic hydrocarbon; m and n are each 0 to 7; r is 1 to 500; and R1? to R5? are each hydrogen or halogen.Type: GrantFiled: February 27, 2003Date of Patent: June 28, 2005Assignee: Canon Kabushiki KaishaInventors: Tatsuki Fukui, Etsuko Sugawa, Tetsuya Yano, Chieko Mihara, Takeshi Imamura, Takashi Kenmoku
-
Patent number: 6887637Abstract: A toner for electrostatic image development, which comprises a binder resin, a colorant and a charge control resin, wherein the charge control resin is a copolymer composed a vinyl monomer unit and a quaternary ammonium salt group-containing (meth)acrylate monomer unit and has a glass transition temperature of 40 to 75° C., and a production process thereof.Type: GrantFiled: February 13, 2001Date of Patent: May 3, 2005Assignee: Zeon CorporationInventor: Kazu Niwa
-
Patent number: 6846601Abstract: In a negatively chargeable toner having i) negatively chargeable toner particles containing at least a binder resin, a colorant and a vinyl copolymer and ii) an inorganic fine powder, the negatively chargeable toner has a weight-average particle diameter of from 4 ?m to 12 ?m and contains, in particle size distribution of the toner, less than 50% by volume of particles of 10.1 ?m or more in particle diameter, and the vinyl copolymer is a vinyl copolymer obtained by copolymerizing a monomer composition which contains at least i) a vinyl monomer such as an N-substituted acryl- or methacrylamide or a ring-structure acryl- or methacrylamide and ii) a vinyl monomer having as a functional group a carboxyl group or a carboxyl group made into salt structure. An image-forming method and a process cartridge make use of such a negatively chargeable toner.Type: GrantFiled: March 10, 2003Date of Patent: January 25, 2005Assignee: Canon Kabushiki KaishaInventors: Minoru Shimojo, Satoshi Matsunaga
-
Patent number: 6818370Abstract: A toner for developing an electrostatic latent image, containing a colorant and a binder resin composed of two different resins (A) and (B), wherein resin (A) is substantially free of tetrahydrofuran insolubles, is selected from polyester resins and polyol resins and has such a molecular weight distribution according to gel permeation chromatography that (a) a main peak is present in a molecular weight of 3000 to 9,000 and (b) that portion of resin (A) having a molecular weight of 500 or less accounts for 4% or less based on a total weight of resin (A), wherein resin (B) is substantially free of tetrahydrofuran insolubles and is a polyester resin containing a diol component represented by the formula (1): and wherein the weight ratio of resin (A) to resin (B) is in the range of 60:40 to 85:15.Type: GrantFiled: November 27, 2002Date of Patent: November 16, 2004Assignee: Ricoh Company, Ltd.Inventors: Osamu Uchinokura, Hiroyuki Fushimi, Kohki Katoh, Shinichiro Yagi, Toshiki Nanya
-
Patent number: 6808852Abstract: A toner characterized by improved fixing performances with no or minimum oil application is formed of: (i) a binder resin, (ii) a colorant, (iii) a hydrocarbon wax, (iv) a resin composition formed by copolymerization of a styrenic monomer together with at least one of nitrogen-containing vinyl monomers, carboxyl group-containing monomers, hydroxyl group-containing monomers and (meth)acrylate ester monomers, in the presence of a hydrocarbon unit; and (v) an organometallic compound. The binder resin (i) comprises a polyester component in a proportion of at least 60 wt. % of the binder resin. The toner has a GPC molecular weight distribution including a weight-average molecular weight (Mw) of at least 4.0×104 an a ratio Mw/Mn of at least 50 between the Mw and a number-average molecular weight (Mn).Type: GrantFiled: September 4, 2002Date of Patent: October 26, 2004Assignee: Canon Kabushiki KaishaInventors: Yojiro Hotta, Wakashi Iida, Tetsuya Ida, Takayuki Itakura, Nozomu Komatsu
-
Publication number: 20040142266Abstract: A toner comprised of a branched amorphous resin, a crystalline resin, and a colorant.Type: ApplicationFiled: January 22, 2003Publication date: July 22, 2004Applicant: Xerox CorporationInventors: Guerino G. Sacripante, Hadi K. Mahabadi, Fatima M. Mayer, Edward G. Zwartz, T. Brian McAneney
-
Patent number: 6743559Abstract: Disclosed is a toner comprising particles of a polyester resin, an optional colorant, and polypyrrole, wherein said toner particles are prepared by an emulsion aggregation process. Another embodiment of the present invention is directed to a process which comprises (a) generating an electrostatic latent image on an imaging member, and (b) developing the latent image by contacting the imaging member with charged toner particles comprising a polyester resin, an optional colorant, and polypyrrole, wherein said toner particles are prepared by an emulsion aggregation process.Type: GrantFiled: January 23, 2003Date of Patent: June 1, 2004Assignee: Xerox CorporationInventors: James R. Combes, Karen A. Moffat, Maria N. V. McDougall
-
Patent number: 6733939Abstract: The electrophotographic toner according to the present invention comprises a binder resin, a colorant, and a negative charge control agent. The binder resin is polyester and/or polyol. The negative charge control agent comprises components which are (1) sulfonic-acid containing monomers, (2) aromatic monomers having electron-withdrawing groups, and (3) acrylate monomers and/or methacrylate monomers. In particular, substituted phenyl maleimides and substituted phenyl itaconimides are prefereably used as the aromatic monomers. Moreover, n-butyl (meth)acrylates and 2-ethylhexyl (meth)acrylates are prefereably used as the acrylate monomers and/or methacrylate monomers.Type: GrantFiled: September 28, 2001Date of Patent: May 11, 2004Assignee: Ricoh Company, Ltd.Inventors: Toshiki Nanya, Hiroyuki Fushimi, Osamu Uchinokura, Shinichiro Yagi, Kohki Katoh
-
Patent number: 6716561Abstract: A toner for developing electrostatic latent images, including a matrix of a first resin selected from polyester resins, polyol resins and mixtures thereof, a plurality of domains of a second resin dispersed in the matrix and containing a wax. The amount of the wax is 2-15% by weight based on the weight of the toner The matrix is substantially free of domains of the second resin having a maximum diameter of greater than 2.0 &mgr;m. A part of the domains containing the wax having a maximum diameter of at least 0.2 &mgr;m constitutes a part of an outer surface of the toner.Type: GrantFiled: November 27, 2001Date of Patent: April 6, 2004Assignee: Ricoh Company, Ltd.Inventors: Keiko Shiraishi, Masanori Suzuki, Yohichiroh Watanabe, Masahide Yamashita, Akihiro Kotsugai, Toyoshi Sawada, Kohki Katoh
-
Patent number: 6689525Abstract: A dispersing agent for a pigment, comprising a specific compound having a structure wherein a phthalocyanine type molecular skeleton which is adsorptive on the pigment and an oligomer unit or polymer unit which prevents re-agglomeration of the pigment to bring out the effect of dispersion are covalently bonded, and having affinity for a medium or a solvent. Also disclosed are a pigment-dispersion composition containing the dispersing agent, a toner prepared using a pigment having been treated with the dispersing agent, and a process for producing such a toner.Type: GrantFiled: February 6, 2002Date of Patent: February 10, 2004Assignee: Canon Kabushiki KaishaInventor: Hitoshi Itabashi
-
Publication number: 20040013962Abstract: A toner comprises toner particles comprising at least a binder resin, a colorant, and a sulfur-containing resin, in which the toner particles comprise the sulfur-containing resin so as to satisfy a relation of; 0.50≦IS/TS≦0.95 where TS denotes a content of sulfur in the toner particles, and IS denotes a content of sulfur in isopropyl alcohol insoluble components of the toner particles, whereby it is possible to obtain a high quality image having an excellent developing resistance regardless of the surrounding conditions and a uniform charge amount distribution regardless of processing speed.Type: ApplicationFiled: May 14, 2003Publication date: January 22, 2004Inventors: Tadashi Doujo, Yuichi Mizoh, Nene Shibayama, Yusuke Hasegawa
-
Patent number: 6673501Abstract: Disclosed is a toner comprising particles of a polyester resin, an optional colorant, and polypyrrole, wherein said toner particles are prepared by an emulsion aggregation process. Another embodiment of the present invention is directed to a process which comprises (a) generating an electrostatic latent image on an imaging member, and (b) developing the latent image by contacting the imaging member with charged toner particles comprising a polyester resin, an optional colorant, and polypyrrole, wherein said toner particles are prepared by an emulsion aggregation process.Type: GrantFiled: November 28, 2000Date of Patent: January 6, 2004Assignee: Xerox CorporationInventors: James R. Combes, Karen A. Moffat, Maria N. V. McDougall