By Coalescing Or Aggregating Patents (Class 430/137.14)
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Publication number: 20130171557Abstract: To provide a toner containing: a binder resin containing a non-crystalline polyester resin and a crystalline polyester resin; a colorant; and wax, wherein the toner satisfies the following formula 1, and has loss tangent of 1 or smaller at 80° C. or higher, B?A<20 Formula 1 where A represents a melting point of the crystalline polyester resin and B represents a temperature at which the toner has storage modulus G? of 20,000 Pa.Type: ApplicationFiled: September 27, 2011Publication date: July 4, 2013Inventors: Naohiro Watanabe, Tsuyoshi Sugimoto, Mamoru Hozumi, Osamu Uchinokura
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Patent number: 8475994Abstract: A toner having charge control agents which impart excellent triboelectric charging characteristics. In embodiments, the toner particles are washed with a solution containing metal ions that impart desirable charging characteristics to the toner particles.Type: GrantFiled: August 23, 2011Date of Patent: July 2, 2013Assignee: Xerox CorporationInventors: Grazyna E. Kmiecik-lawrynowicz, Robert D. Bayley, Maura A. Sweeney, Mark E. Mang
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Patent number: 8475993Abstract: A method for producing a decolorable toner comprising: forming particles containing a color former compound, a color developing agent, and a binder resin; forming first aggregated particles by aggregating and fusing the particles containing the color former compound, the color developing agent, and the binder resin in a dispersion medium; and forming second aggregated particles by aggregating and fusing the first aggregated particles and a binder resin in a dispersion medium.Type: GrantFiled: November 19, 2010Date of Patent: July 2, 2013Assignee: Toshiba Tec Kabushiki KaishaInventor: Masahiro Ikuta
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Patent number: 8475992Abstract: A process for preparing a toner comprising a binder resin and a colorant, wherein the binder resin comprises a polyester resin having an acid value (AV) greater than 5 mg KOH/g, the process comprising: providing an aqueous dispersion of self-dispersed polyester resin particles and associating the polyester resin particles by means of a change in the pH of the dispersion.Type: GrantFiled: June 20, 2008Date of Patent: July 2, 2013Assignee: Fujifilm Imaging Colorants LimitedInventors: Daniel Patrick Morris, John Dylan Morgan, Martin Russell Edwards, Miguel Angel Rodriguez-Vazquez, Mohammed Nawaz, Zoonia Mehmood
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Publication number: 20130157187Abstract: The disclosure describes a pigment treated with a rosin and a toner particle containing that rosin-treated pigment particle. The toner has a lower level of dielectric loss.Type: ApplicationFiled: December 14, 2011Publication date: June 20, 2013Applicant: Xerox CorporationInventors: Ke Zhou, Rina Carlini, Daryl W. Vanbesien, Cuong Vong, Karen A. Moffat, Richard P.N. Veregin
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Patent number: 8460848Abstract: Solvent-free extrusion processes are disclosed that are suitable for forming high bio-based polyester latexes that may be utilized in forming a toner, as well as other commercial products.Type: GrantFiled: December 14, 2010Date of Patent: June 11, 2013Assignee: Xerox CorporationInventors: Shigang Qiu, Santiago Faucher, Fumii Higuchi, Guerino G. Sacripante
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Patent number: 8460847Abstract: The present invention relates to a toner for electrophotography including a polyester obtained by subjecting a crystalline polyester-containing aqueous dispersion and a non-crystalline polyester-containing aqueous dispersion to aggregation and coalescence, as a resin binder, wherein the crystalline polyester is produced by polycondensing an alcohol component containing 70 mol % or more of an aliphatic diol having 2 to 8 carbon atoms with a carboxylic acid component containing 50 mol % or more of terephthalic acid. The toner is excellent in low-temperature fusing ability and pressure storage stability.Type: GrantFiled: August 14, 2009Date of Patent: June 11, 2013Assignee: Kao CorporationInventors: Eiji Shirai, Takashi Kubo, Hiroshi Mizuhata, Shoichi Murata
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Patent number: 8455169Abstract: The toner includes a binder resin; a colorant; and a release agent. The first inter-particle force Fp(A) of the toner, which is measured under an environmental condition of 23° C. and 60% RH after the toner is pressed for 1 minute at 25° C. under a compression stress of 15 kg/cm2, is from 1.0×10?9 (N) to 1.0×10?6 (N). The difference (Fp(B)?Fp(A)) between the second inter-particle force Fp(B) of the toner, which is measured under the environmental condition of 23° C. and 60% RH after the toner is pressed for 1 minute at 50° C. under a compression stress of 15 kg/cm2, and the first inter-particle force Fp(A) is 0 (N) to 1.0×10?7 (N).Type: GrantFiled: June 23, 2010Date of Patent: June 4, 2013Assignee: Ricoh Company, LimitedInventors: Daisuke Inoue, Fumihiro Sasaki, Osamu Uchinokura, Satoshi Kojima, Hideki Sugiura, Naoko Morisawa
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Publication number: 20130137031Abstract: An electrophotographic toner produced by mixing a dispersion of colorant particles containing a colorant and a dispersion of release agent particles containing a release agent and having a volume average particle diameter smaller than that of the colorant particles, aggregating the colorant particles and the release agent particles in the dispersion to produce first aggregates, mixing a dispersion of resin particles containing a binder resin and having a volume average particle diameter smaller than that of the release agent particles in the dispersion containing the first aggregates, and aggregating the first aggregates and the resin particles in the dispersion of the first aggregates and the resin particles to coat the first aggregates with the resin particles, producing second aggregates.Type: ApplicationFiled: October 31, 2012Publication date: May 30, 2013Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventor: TOSHIBA TEC KABUSHIKI KAISHA
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Patent number: 8450040Abstract: A method of making toner particles, including mixing at least one emulsion of at least one resin, a colorant, an optional wax, and optional additives to form a slurry; heating the slurry to form aggregated particles in the slurry; freezing aggregation of the particles with a buffer solution; and heating the aggregated particles in the slurry to coalesce the particles into toner particles.Type: GrantFiled: October 22, 2009Date of Patent: May 28, 2013Assignee: Xerox CorporationInventors: Kimberly D. Nosella, Allan K. Chen, Abdisamed Sheik-Qasim, Melanie L. Davis, Zhen Lai
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Publication number: 20130130174Abstract: A method of manufacturing toner is provided. The method includes preparing a first liquid by dissolving or dispersing toner components in an organic solvent, preparing a second liquid by emulsifying the first liquid in an aqueous medium, and evaporating the organic solvent from the second liquid. The toner components include a colorant, a release agent, and one or both of a binder resin and a precursor thereof. The evaporating includes flowing down the second liquid as a liquid film in substantially a vertical direction along an inner wall surface of a pipe that is depressurized, heating the liquid film at a temperature not higher than a glass transition temperature of the binder resin, and supplying the pipe with a depressurized water vapor from a supply opening disposed on an upper part of the pipe.Type: ApplicationFiled: November 6, 2012Publication date: May 23, 2013Inventor: Hiroshi YAMADA
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Patent number: 8445172Abstract: A method for producing a toner, containing: ultrasonically vibrating a liquid toner composition in which a toner material containing at least a binder resin and a colorant is dissolved or dispersed in a solvent; introducing the liquid toner composition to a liquid chamber, and ejecting the liquid toner composition as droplets from an ejecting plate having a plurality of holes and disposed on one surface of the liquid chamber; and drying and solidifying the droplets so as to produce a toner, wherein the ultrasonically vibrating is performed before the introducing the liquid toner composition to the liquid chamber.Type: GrantFiled: March 5, 2010Date of Patent: May 21, 2013Assignee: Ricoh Company, Ltd.Inventors: Yasutada Shitara, Yoshihiro Norikane, Yohichiroh Watanabe, Andrew Mwaniki Mulwa
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Publication number: 20130122418Abstract: A process including contacting an alkyl benzene sulfonate surfactant having an ammonium salt counter ion with a component to be emulsified or dispersed, wherein the alkyl benzene sulfonate surfactant is substantially free of sodium salt counter ions such that the sodium content of the alkyl benzene sulfonate surfactant is less than about 5,000 parts per million, and water to form a mixture; using the alkyl benzene sulfonate surfactant to emulsify the component and form an emulsion; or using the alkyl benzene sulfonate surfactant to disperse the component and form a dispersion.Type: ApplicationFiled: November 10, 2011Publication date: May 16, 2013Applicant: Xerox CorporationInventors: Kimberly D. Nosella, Shigang S. Qiu, Santiago Faucher, Allan Chen
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Patent number: 8440382Abstract: A method of stably producing a toner is provided. This method provides a long-term stabilization of material dispersion in a colorant-dispersed solution and inhibits segregation of the material and provides a more microfine and more uniform dispersion of the colorant in the toner, and moreover produces a toner that has a sharp toner particle diameter distribution. This method of producing toner has at least a colorant dispersion step of obtaining a colorant-dispersed solution by dispersing a pigment-containing colorant in a liquid mixture that contains the colorant and a dissolved resin solution or a polymerizable monomer, wherein the liquid mixture contains a nonionic surfactant and the nonionic surfactant has at least an oxyalkylene group and has a hydrophile-lipophile balance value (HLB value) of 9.0 or more and 17.0 or less.Type: GrantFiled: June 3, 2011Date of Patent: May 14, 2013Assignee: Canon Kabushiki KaishaInventors: Naoya Isono, Katsuyuki Nonaka, Yasuhiro Hashimoto, Akira Sugiyama, Yuhei Terui
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Publication number: 20130108955Abstract: An object of the present invention is to provide a process of producing a toner according to an emulsion aggregation process in which the temperature and treatment time in the fusion process can be reduced, and a toner having a small particle diameter, a sharp particle size distribution, and a properly controlled average circularity can be efficiently produced simply with a small amount of energy. The process includes aggregating a resin fine particles and a colorant fine particles by adding an aggregating agent containing a divalent or higher-valent metal ion, and fusing the resin fine particles and the colorant fine particles to obtain a toner particle by adding a chelating agent and a monovalent metal salt to the aggregate particle dispersion liquid obtained in the aggregation process, and heating the liquid to a temperature of not less than glass transition temperature of the resin.Type: ApplicationFiled: October 18, 2012Publication date: May 2, 2013Applicant: CANON KABUSHIKI KAISHAInventor: CANON KABUSHIKI KAISHA
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Patent number: 8431319Abstract: A washing process using one or more ionic liquids (ILs) as a washing aid agent for toners, including toners produced using such ILs, such as, low melt toners, is provided. ILs are environmentally sound, green solvents that act to swell toner particle surfaces so that surface absorbed and adsorbed pollutants, such as, surfactants and other manufacturing reactants, can be effectively removed. The resulting toners have good charging, charge maintenance and RH sensitivity.Type: GrantFiled: March 22, 2011Date of Patent: April 30, 2013Assignee: Xerox CorporationInventors: Zhen Lai, Chieh-Min Cheng, Zhaoyang Ou
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Patent number: 8431318Abstract: The present disclosure provides processes for producing polyester toners by emulsion aggregation where the resulting toner particles have high pigment loadings and desired circularity. The methods include adding a metal, in embodiments a metal compound, at the beginning of coalescence, which speeds the coalescence process and produces toner particles having a desired size and circularity for use in electrophotographic imaging systems.Type: GrantFiled: April 9, 2010Date of Patent: April 30, 2013Assignee: Xerox CorporationInventors: Daryl W. Vanbesien, Allan K. Chen, Kimberly D. Nosella, Cuong Vong, Karen Ann Moffat, Richard P. N. Veregin, Valerie M. Farrugia
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Patent number: 8431321Abstract: There are provided a toner that allows prevention of environmental contamination and is nevertheless free from toner durability degradation, wherein a sufficiently wide color reproduction range can be secured even when it is applied to color toner, and variation in characteristics among toner particles can be suppressed, as well as a method of manufacturing a toner, a developing device, and an image forming apparatus. In the toner particle is formed the biomass resin-containing domain.Type: GrantFiled: January 11, 2012Date of Patent: April 30, 2013Assignee: Sharp Kabushiki KaishaInventor: Yasuhiro Shibai
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Patent number: 8431320Abstract: Disclosed is a manufacturing method of toner which includes at least polyester resin and colorant, comprising the steps of: (A) dissolving, into an organic solvent, the polyester resin and ultrahigh molecular weight styrene resin in which a peak is present in a range larger than 500 thousands and smaller than 3 million in a molecular weight distribution, and preparing a binder resin solution; (B) dispersing the binder resin solution as binder resin solution droplets into an aqueous medium; (C) removing the organic solvent from the binder resin solution droplets, and preparing a resin particle dispersion; and (D) aggregating resin particles from which the organic solvent is removed and colorant particles containing the colorant with each other, and forming toner particles.Type: GrantFiled: July 20, 2011Date of Patent: April 30, 2013Assignee: Konica Minolta Business Technologies, Inc.Inventors: Masaharu Matsubara, Hiroyuki Kozuru, Noboru Ueda
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Patent number: 8426099Abstract: Colored resin particles, each includes: a resin; and a colorant, wherein a value of average equivalent circle diameter A (?m) of the colored resin particles is 3?A?6, an average degree of circularity B of the colored resin particles satisfies the following expression (1), and 0.990?0.0083A?B?1.021?0.0117A??(1) a cumulative number frequency of particles which have degrees of circularity of less than 0.9 in the colored resin particles is 1% or less.Type: GrantFiled: May 23, 2012Date of Patent: April 23, 2013Assignee: Fuji Xerox Co., Ltd.Inventors: Tomohito Nakajima, Hiroyuki Moriya, Hideya Katsuhara, Seiichi Takagi, Kazuya Hongo
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Patent number: 8420286Abstract: The present disclosure provides processes for preparing toner particles, in which fewer coarse particles are generated. The process includes introducing a buffer solution during coalescence of the toner slurry. The amount of coarse particles in the resulting toner particles may, in embodiments, be reduced to less than about 5 percent by weight of the total toner particles generated.Type: GrantFiled: March 27, 2008Date of Patent: April 16, 2013Assignee: Xerox CorporationInventors: Kimberly D. Nosella, Guerino G. Sacripante
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Publication number: 20130089359Abstract: An electrostatic latent image developing toner has an average sphericity of at least 0.94 but no more than 0.98, the particles for which the accumulated equivalent spherical diameter on a number basis is at least 90% and the sphericity is less than 0.92 account for less than 3% of the entire toner, the proportion of particles having a sphericity of at least 0.90 but less than 0.95 is at least 20% but no more than 40% of the entire toner, and a proportion of particles having a sphericity of at least 0.95 but no more than 1.00 is at least 60% but no more than 80% of the entire toner.Type: ApplicationFiled: November 5, 2012Publication date: April 11, 2013Applicant: FUJI XEROX CO., LTD.Inventor: FUJI XEROX CO., LTD.
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Publication number: 20130084519Abstract: The disclosure describes a toner process in which portion-wise addition of colorant(s) during particle formation is used to control the distribution of colorant within the toner particle, thereby enhancing A zone charge.Type: ApplicationFiled: September 30, 2011Publication date: April 4, 2013Applicant: XEROX CORPORATIONInventors: Ke Zhou, Shigang Qiu, Kimberly Nosella, Cuong Vong
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Publication number: 20130084520Abstract: An electrostatic image developing toner of the exemplary embodiment of the invention contains an amorphous first polyester resin of a polycondensation product of at least a carboxylic acid component and an alcohol component containing rosin, and a second polyester resin having the difference (absolute value) in parameter of solubility relative to the first polyester resin of from about 0.3 (cal/cm3)1/2 to about 3 (cal/cm3)1/2.Type: ApplicationFiled: September 25, 2012Publication date: April 4, 2013Applicant: FUJI XEROX CO., LTD.Inventor: FUJI XEROX CO., LTD.
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Patent number: 8409776Abstract: A toner for developing an electrostatic image, contains a binder resin having an acid value of from approximately 10 mgKOH/g to approximately 20 mgKOH/g and carbon black having a surface carboxyl group density of from approximately 2×10?6 mol/m to approximately 8×10?6 mol/m2, and is prepared in an aqueous medium.Type: GrantFiled: April 7, 2011Date of Patent: April 2, 2013Assignee: Fuji Xerox Co., Ltd.Inventor: Soichiro Kitagawa
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Patent number: 8409775Abstract: The present invention relates to a toner for electrophotography which has a small particle size and is excellent in all of low-temperature fusing ability, anti-hot offset property and image characteristics and a process for producing the toner, as well as to a dispersion of crosslinked resin particles which is used for production of the toner for electrophotography and a process for producing the dispersion of crosslinked resin particles. The dispersion of crosslinked resin particles having a volume median particle size (D50) of from 0.05 to 0.7 ?m according to the present invention is produced by a process including the steps of (A) neutralizing a resin containing an acid group-containing polyester in an aqueous medium to obtain a dispersion of resin particles; and (B) mixing the dispersion of resin particles obtained in the step (A) with an oxazoline group-containing polymer at a temperature of from 60 to 100° C.Type: GrantFiled: September 5, 2008Date of Patent: April 2, 2013Assignee: Kao CorporationInventors: Manabu Suzuki, Yutaka Murai
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Patent number: 8409777Abstract: There is provided a toner which can be manufactured in a simple production method and which is excellent in preservation stability and anti-offset property with uniformly-charging performance. The toner is formed of aggregate of resin-containing particles which are obtained by forming amorphous resin particles into slurry and further finely granulating the amorphous resin particles in form of the slurry followed by aggregation of the amorphous resin particles and which contains a binder resin, a colorant, a release agent, and a release agent-dispersing aid, the resin-containing particles having a volume average particle diameter in a range of from 0.4 ?m to 1.0 ?m.Type: GrantFiled: July 11, 2007Date of Patent: April 2, 2013Assignee: Sharp Kabushiki KaishaInventors: Yoritaka Tsubaki, Yasuhiro Shibai
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Publication number: 20130078566Abstract: Disclosed are a low-environmental load toner for electrostatic image development and a production process of the toner. The toner for electrostatic image development includes toner particles containing a resin. The resin contains a vinyl polymer having a structural unit represented by the following general formula (1): [in the general formula (1), R1 is a hydrogen atom, —CH2OH, —CH2OR2, or —CH2O(C?O)R3, and R2 and R3 are each an alkyl group having 1 to 8 carbon atoms].Type: ApplicationFiled: September 12, 2012Publication date: March 28, 2013Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Mikio KOUYAMA, Ken OHMURA
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Publication number: 20130078565Abstract: An electrostatic charge image developing toner contains a binder resin, a release agent, a black colorant, a methylglycine diacetate, and an aluminum element, the content of the methylglycine diacetate is in the range of from 5 ppm to 500 ppm, and the content of the aluminum element is in the range of from 0.07 atomic % to 0.18 atomic % in total element analysis using fluorescent X-rays.Type: ApplicationFiled: February 15, 2012Publication date: March 28, 2013Applicant: FUJI XEROX CO., LTD.Inventors: Satoshi YOSHIDA, Tsuyoshi MURAKAMI, Eisuke IWAZAKI, Shinya SAKAMOTO
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Publication number: 20130078562Abstract: An electrostatic image developing toner including: first toner particles which contain a first binder resin and a photoluminescent pigment; and second toner particles which contain a second binder resin and do not contain a photoluminescent pigment, wherein the proportion of the second toner particles is in a range from 5% by number to 80% by number with respect to a total number of all toner particles.Type: ApplicationFiled: February 1, 2012Publication date: March 28, 2013Applicant: Fuji Xerox Co., Ltd.Inventors: Masaru TAKAHASHI, Shotaro TAKAHASHI, Atsushi SUGITATE, Shuji SATO
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Patent number: 8404420Abstract: A decolorable electrophotographic toner, containing a color former compound, a color developing agent, a binder resin, and a release agent, wherein the toner has a pH of from 6 to 9 when dispersed in water with a pH of from 5.5 to 7 at a mass ratio of toner/water of 1/10.Type: GrantFiled: November 22, 2010Date of Patent: March 26, 2013Assignee: Toshiba Tec Kabushiki KaishaInventor: Satoshi Araki
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Patent number: 8394561Abstract: The present disclosure provides violet toners and methods for their production. In embodiments, methods of the present disclosure include systems which may be utilized to predict the color properties of a violet toner, thereby permitting adjustment of the pigment loading and/or target mass per unit area.Type: GrantFiled: July 20, 2009Date of Patent: March 12, 2013Assignee: Xerox CorporationInventors: Jordan H. Wosnick, Suxia Yang, Richard P. N. Veregin, Karen A. Moffat
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Patent number: 8394566Abstract: A toner composition with a novel surface additive package for developing images. The additive package includes sol-gel silica, a PDMS silica, an organic spacer such as PMMA and HMDS silica. The toner composition exhibits improved control of voltage, higher print density, lower toner amount remaining on the roll, lower toner usage, and reduced drum contamination. The toner composition also exhibits improved dry theological properties. These improved properties make this toner composition useful for higher speed printing while using less toner.Type: GrantFiled: November 24, 2010Date of Patent: March 12, 2013Assignee: Xerox CorporationInventors: Grazyna E. Kmiecik-Lawrynowicz, Maura A. Sweeney, Daniel W. Asarese, Samir Kumar, Juan A. Morales-Tirado, Michael F. Zona
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Patent number: 8394568Abstract: The present disclosure provides processes for producing resins suitable for use in forming toner compositions. In embodiments, the processes described herein comprise formation of latexes, including latexes for use in toners, produced without use of solvents.Type: GrantFiled: November 2, 2009Date of Patent: March 12, 2013Assignee: Xerox CorporationInventors: Shigang Qiu, Santiago Faucher, John Abate, Allan Chen, Ke Zhou
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Publication number: 20130059248Abstract: Method for producing structured particles specifically nanoparticles, toners for laser printers and photocopiers, particularly chemical toner with particular product properties. The method produces toners of improved performance. Method relates particularly to the selection and properties of the base materials and utilizing these properties to design the toner product properties that result in improved performance.Type: ApplicationFiled: May 6, 2011Publication date: March 7, 2013Applicant: Navran Advanced Nanoproducts Development International PVT. LTD.Inventor: Abhinava Kumar
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Patent number: 8389188Abstract: Provided are a toner using a resin having an active hydrogen-containing group, and a method of preparing the toner. The toner using a resin having an active hydrogen-containing group includes a binder resin (A), a cross-linked resin including a THF insoluble content of 99-100 weight %, a colorant, and at least one additive. The cross-linked resin is arranged in the form of a plurality of islands in each particle of the toner.Type: GrantFiled: October 22, 2008Date of Patent: March 5, 2013Assignee: Samsung Fine Chemicals Co., Ltd.Inventors: Dong Won Kim, Woo Young Yang, Keon Il Kim, Dae Il Hwang, Il Hyuk Kim, Jae Bum Park, Il Sun Hwang, Jae Kwang Hwang, Dae Woong Choi, Duck Kyun Ahn
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Patent number: 8389189Abstract: The present invention relates to a resin binder for toners which includes core/shell particles each including a core portion containing a crystalline polyester obtained by polycondensing an alcohol component containing an aliphatic diol having 2-12 carbon atoms and a carboxylic acid component containing an aliphatic dicarboxylic acid compound having 8-12 carbon atoms in an amount of 70-100 mol %, and a non-crystalline resin (A) obtained by polycondensing an alcohol component and a carboxylic acid component containing at least one succinic acid compound selected from the group consisting of an alkyl (C9-C18) succinic acid and an alkenyl (C9-C18) succinic acid in an amount of 3-60 mol %; and a shell portion containing a non-crystalline resin (B) obtained by polycondensing a carboxylic acid component and an alcohol component containing an aliphatic dialcohol having 2-5 carbon atoms in an amount of 80 mol % or more.Type: GrantFiled: March 2, 2011Date of Patent: March 5, 2013Assignee: Kao CorporationInventors: Eiji Shirai, Shoichi Murata
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Publication number: 20130052581Abstract: A toner having charge control agents which impart excellent triboelectric charging characteristics. In embodiments, the toner particles are washed with a solution containing metal ions that impart desirable charging characteristics to the toner particles.Type: ApplicationFiled: August 23, 2011Publication date: February 28, 2013Applicant: XEROX CORPORATIONInventors: Grazyna E. Kmiecik-lawrynowicz, Robert D. Bayley, Maura A. Sweeney, Mark E. Mang
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Patent number: 8377621Abstract: A process for preparing a toner comprising a binder resin and a colorant, wherein the binder resin comprises a polyester resin having an acid value greater than 5 mg KOH/g, the process comprising: providing an aqueous dispersion of polyester resin particles stabilized by an ionic surfactant and then associating the polyester resin particles.Type: GrantFiled: June 20, 2008Date of Patent: February 19, 2013Assignee: Fujifilm Imaging Colorants LimitedInventors: Daniel Patrick Morris, John Dylan Morgan, Martin Russell Edwards, Miguel Angel Rodriguez-Vazquez, Mohammed Nawaz, Zoonia Mehmood
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Patent number: 8372573Abstract: A toner in which, in a loss tangent (tan ?) curve obtained by a dynamic viscoelasticity test, the tan ? shows a maximal value ?a in the temperature region of 28.0-60.0° C., which maximal value ?a is 0.50 or more, and shows a minimal value ?b in the temperature region of 45.0-85.0° C., which minimal value ?b is 0.60 or less, where the difference between the maximal value ?a and the minimal value ?b is 0.20 or more; and, where the temperature that affords the maximal value ?a is represented by Ta (° C.) and the temperature that affords the minimal value ?b is represented by Tb (° C.), the difference between the Ta and the Tb is 5.0-45.0° C.; and the toner having, in a storage elastic modulus (G?) curve obtained by the dynamic viscoelasticity test, a value G?a of a storage elastic modulus at the Ta, of 1.00×106-5.00×107 Pa.Type: GrantFiled: March 19, 2012Date of Patent: February 12, 2013Assignee: Canon Kabushiki KaishaInventors: Yasukazu Ayaki, Atsushi Tani, Tsuneyoshi Tominaga
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Patent number: 8372574Abstract: A method of producing an electrostatic latent image developing toner includes: preparing a resin particle dispersion by polymerizing, in a water-based solvent, a polymerizable monomer that comprises a polymerizable monomer comprising a vinyl-based double bond; extracting a liquid from the resin particle dispersion by heating; mixing the distilled resin particle dispersion with a colorant particle dispersion prepared by dispersing a colorant; and aggregating the resin particles, the pigment particles and a release agent particles to form aggregate particles, and then conducting heating to fuse the aggregate particles.Type: GrantFiled: October 4, 2011Date of Patent: February 12, 2013Assignee: Fuji Xerox Co., Ltd.Inventors: Hideo Maehata, Yukihiro Ishii, Masaaki Suwabe, Tsutomu Kubo, Makiko Nakano, Kazuhiko Yanagida, Yasuo Matsumura
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Patent number: 8367294Abstract: The present disclosure provides processes for preparing toner particles, in which fewer coarse particles are generated. The process includes introducing a buffer solution during coalescence of the toner slurry. The amount of coarse particles in the resulting toner particles may, in embodiments, be reduced to less than about 5 percent by weight of the total toner particles generated.Type: GrantFiled: March 4, 2010Date of Patent: February 5, 2013Assignee: Xerox CorporationInventors: Kimberly D. Nosella, Guerino G. Sacripante
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Publication number: 20130011776Abstract: Disclosed is a decolorable toner produced by aggregating dispersed fine particles of a color material containing at least a color-forming compound, a color-developing agent and a decoloring agent with dispersed fine particles containing at least a binder resin having a carboxyl group, then adding a compound having a carbodiimide group or an epoxy group reactive with the carboxyl group of the binder resin, and thereafter fusing the aggregate particles, respectively in an aqueous medium. The thus obtained decolorable toner can suppress the generation of fine powder by the release of erasable color material fine particles from the toner particles.Type: ApplicationFiled: June 29, 2012Publication date: January 10, 2013Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Takayasu Aoki, Motonari Udo, Tsuyoshi Itou, Masahiro Ikuta, Takafumi Hara
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Publication number: 20130011777Abstract: Disclosed is a process for production of a decolorable toner, including: aggregating dispersed fine particles of a color material comprising at least a color-forming compound, a color-developing agent and a decoloring agent with dispersed fine particles comprising at least a binder resin comprising a polyester resin to form aggregates in an aqueous medium, adding a reactive polymer having an oxazoline group in to the aqueous medium, and fusing the aggregates in the aqueous medium. As a result, it becomes possible to produce a decolorable toner which suppresses the generation of fine powder due to the release of fine particles of an erasable color material from the toner.Type: ApplicationFiled: June 29, 2012Publication date: January 10, 2013Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Takayasu Aoki, Takafumi Hara, Tsuyoshi Itou, Masahiro Ikuta, Motonari Udo, Koji Shimokusa, Hiroshi Mizuhata
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Patent number: 8349531Abstract: Compounds and methods of forming compounds useful as a toner or toner precursor are disclosed. The compounds may include an aqueous dispersion, the dispersion including: (A) at least one thermoplastic resin; and (B) 0 to 5 weight percent of a stabilizing agent, based on the total weight of (A) and (B). The dispersion may have an average volume diameter particle size from about 0.05 to about 10 microns. A combined amount of the thermoplastic resin and the stabilizing agent may have an acid number of less than 25 mg KOH/g.Type: GrantFiled: November 26, 2008Date of Patent: January 8, 2013Assignee: Dow Global Technologies LLCInventors: Timothy J. Young, Richard A. Lundgard, Michael J. Johnson, Qichun Wan, Matthew J. Kalinowski, Mechelle A. Churchfield, Gary M. Strandburg
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Publication number: 20130004891Abstract: A toner comprising a modified polyester resin containing a structure represented by Formula (1a) or (1b), wherein, in Formula (1a) and (1b), R1 represents a hydrogen atom, a methyl group, or an ethyl group, R2 represents an aliphatic hydrocarbon which may be branched, or an aromatic hydrocarbon, and R3 represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or a phenyl group.Type: ApplicationFiled: June 21, 2012Publication date: January 3, 2013Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Hiroshi NAGASAWA, Ken OHMURA
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Patent number: 8343703Abstract: An electrostatic image developing toner, includes: a block copolymer that contains: a block A that has a glass transition temperature of about 60° C. or more; and a crystalline block B that has a melting point of about 25° C. or more derived from an ethylenically unsaturated compound, wherein the block copolymer satisfies the following equations (1) to (3): 30° C.?[T(0.5 MPa)?T(30 MPa)]?80° C.??(1) 60° C.?T(0.5 MPa)??(2) T(30 MPa)?80° C.??(3) wherein T(0.5 MPa) represents a temperature at which a viscosity of the block copolymer is 104 Pa·s when a pressure applied by a flow tester is 0.5 MPa; and T(30 MPa) represents a temperature at which a viscosity of the block copolymer is 104 Pa·s when a pressure applied by a flow tester is 30 MPa.Type: GrantFiled: August 7, 2009Date of Patent: January 1, 2013Assignee: Fuji Xerox Co., Ltd.Inventors: Hideo Maehata, Yasuo Matsumura, Takashi Imai
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Publication number: 20120328981Abstract: Disclosed is a preparation method for a toner. Problems according to use of a surfactant can be solved and it is possible to prepare toner particles having a uniform distribution of particle size by using an alkali-soluble resin containing an acidic group.Type: ApplicationFiled: February 16, 2011Publication date: December 27, 2012Applicant: SAMSUNG FINE CHEMICALS CO., LTD.Inventors: Il Hyuk Kim, Ji Sang Jeong, Ha Na Jung, Sung Hwa Lee, Kyung Gyol Yon
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Publication number: 20120328978Abstract: According to one embodiment, a developing agent includes a binder resin and a coloring agent, wherein when the developing agent is subjected to methanol extraction, and a filtrate of the resulting extract is subjected to HPLC measurement, the ratio of a peak area at a retention time of 10 minutes or less to the total peak area is 15.0% or less.Type: ApplicationFiled: June 19, 2012Publication date: December 27, 2012Applicants: TOSHIBA TEC KABUSHIKI KAISHA, KABUSHIKI KAISHA TOSHIBAInventor: Junichi Ishikawa
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Publication number: 20120328980Abstract: The toner for electrostatic image development has excellent charge properties, by which excellent toner particle size-controlling ability is achieved, and moreover the sharpening of a particle size distribution is achieved. The toner is composed of toner particles containing a binder resin. The process has an aggregating step of adding an aggregating agent containing a transition element into an aqueous medium of dispersed fine binder resin particles to aggregate the fine binder resin particles, and an aggregation-stopping step of adding an aggregation stopper composed on a sulfur atom-containing compound exhibiting a reducing action on the aggregating agent. The aggregating agent is a salt of a bivalent or higher metal selected from Sr, Ti, V, Cr, Mn, Fe, Co, Ni and Cu.Type: ApplicationFiled: June 18, 2012Publication date: December 27, 2012Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Saburou HIRAOKA, Tomomi OSHIBA, Mikihiko SUKENO, Tomoko MINE, Hitomi MOTANI, Tatsuya NAGASE, Ken OHMURA