Patents by Inventor Masaaki Taya
Masaaki Taya has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8293447Abstract: An object of the present invention is to provide a toner which allows fixation at low temperatures, which is excellent in anti-offset ability, and which provides a high quality image at high and low humidities in a stable manner without causing any image defect over time. Provided is a toner, containing at least a binder resin and a colorant in which: the binder resin in the toner contains 60% by mass or more of a styrene/acryl resin and a THF-insoluble fraction A which is an extraction residue obtained by carrying out Soxhlet extraction with tetrahydrofuran (THF) for 16 hours; the THF-insoluble fraction A contains a TOL-insoluble fraction B which is an extraction residue obtained by carrying out Soxhlet extraction with toluene (TOL) for 16 hours; and a mass ratio (B/A) between the THF-insoluble fraction A and the TOL-insoluble fraction B is in the range of 0.1?B/A?0.5.Type: GrantFiled: June 22, 2011Date of Patent: October 23, 2012Assignee: Canon Kabushiki KaishaInventors: Katsuhisa Yamazaki, Masami Fujimoto, Masaaki Taya
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Publication number: 20110256480Abstract: An object of the present invention is to provide a toner which allows fixation at low temperatures, which is excellent in anti-offset ability, and which provides a high quality image at high and low humidities in a stable manner without causing any image defect over time. Provided is a toner, containing at least a binder resin and a colorant in which: the binder resin in the toner contains 60% by mass or more of a styrene/acryl resin and a THF-insoluble fraction A which is an extraction residue obtained by carrying out Soxhlet extraction with tetrahydrofuran (THF) for 16 hours; the THF-insoluble fraction A contains a TOL-insoluble fraction B which is an extraction residue obtained by carrying out Soxhlet extraction with toluene (TOL) for 16 hours; and a mass ratio (B/A) between the THF-insoluble fraction A and the TOL-insoluble fraction B is in the range of 0.1?B/A?0.5.Type: ApplicationFiled: June 22, 2011Publication date: October 20, 2011Applicant: CANON KABUSHIKI KAISHAInventors: Katsuhisa Yamazaki, Masami Fujimoto, Masaaki Taya
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Patent number: 7897316Abstract: Provided is a toner including at least: a binder resin; and a colorant, in which: the binder resin contains at least a polyester unit and a vinyl copolymer unit; a main peak MpA is present in the molecular weight region of 2,000 to 7,000 in a molecular weight distribution measured by means of gel permeation chromatography (GPC) of a specific tetrahydrofuran (THF) soluble matter A measured by a specific method; a main peak MpB is present in the molecular weight region of 5,000 to 10,000 in a molecular weight distribution measured by means of GPC of a specific THF soluble matter B which contains a component of a molecular weight region of 100,000 or less in range from 70 to 100 mass %, and the peak molecular weight MpA of the THF soluble matter A and the peak molecular weight MpB of the THF soluble matter B satisfy a specific equation.Type: GrantFiled: July 24, 2006Date of Patent: March 1, 2011Assignee: Canon Kabushiki KaishaInventors: Katsuhisa Yamazaki, Masami Fujimoto, Shuichi Hiroko, Masaaki Taya
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Publication number: 20070026336Abstract: Provided is a toner including at least: a binder resin; and a colorant, in which: the binder resin contains at least a polyester unit and a vinyl copolymer unit; a main peak MpA is present in the molecular weight region of 2,000 to 7,000 in a molecular weight distribution measured by means of gel permeation chromatography (GPC) of a specific tetrahydrofuran (THF) soluble matter A measured by a specific method; a main peak MpB is present in the molecular weight region of 5,000 to 10,000 in a molecular weight distribution measured by means of GPC of a specific THF soluble matter B which contains a component of a molecular weight region of 100,000 or less in range from 70 to 100 mass %, and the peak molecular weight MpA of the THF soluble matter A and the peak molecular weight MpB of the THF soluble matter B satisfy a specific equation.Type: ApplicationFiled: July 24, 2006Publication date: February 1, 2007Applicant: CANON KABUSHIKI KAISHAInventors: KATSUHISA YAMAZAKI, Masami Fujimoto, Shuichi Hiroko, Masaaki Taya
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Patent number: 7147981Abstract: In a toner having toner particles having at least a binder resin and a colorant, the binder resin in the toner contains at least i) a vinyl resin formed of a vinyl resin having at least a carboxyl group and a vinyl resin having at least an epoxy group, and having a cross-linked structure formed by the reaction of the carboxyl group of the former with the epoxy group of the latter, and ii) a copolymer having an aliphatic conjugated diene compound as a monomer component; and the binder resin in the toner has a THF-insoluble matter in a content of from 0.1% by weight to 60% by weight, and the copolymer having an aliphatic conjugated diene compound as a monomer component is incorporated in an o-dichlorobenzene-soluble matter of the THF-insoluble matter. This toner has superior developing stability and running performance in high-speed machines, and can keep fixing separation claws from contamination.Type: GrantFiled: March 26, 2004Date of Patent: December 12, 2006Assignee: Canon Kabushiki KaishaInventors: Hiroyuki Fujikawa, Masami Fujimoto, Takakuni Kobori, Masaaki Taya
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Patent number: 6929894Abstract: A toner is disclosed which is composed of toner particles containing at least a binder resin, a colorant and a wax, and an external additive. The wax has, in its DSC endothermic curve, a maximum endothermic peak at 55° C. to 80° C. within the temperature range from 30° C. to 160° C., the maximum endothermic peak having a half width of from 2° C. to 7° C., and the binder resin is composed chiefly of a polyester resin. The toner has a dynamic elastic modulus from 5×102 to 1×105 dN/m2 at 140° C., and its ratio to a dynamic elastic modulus at 170° C. is from 0.05 to 50, and the toner contains 10 to 20% by weight of THF-insoluble matter A of a binder resin component after 8 hours from the start of extraction and 1 to 10% by weight of THF-insoluble matter B of the binder resin component after 24 hours from the start of extraction, the ratio of A to B, B/A, being from 0.1 to 0.8. Also disclosed is a fixing method making use of this toner.Type: GrantFiled: July 10, 2002Date of Patent: August 16, 2005Assignee: Canon Kabushiki KaishaInventors: Nobuyoshi Sugahara, Masaaki Taya, Junko Yoshikawa, Takayuki Itakura, Yojiro Hotta
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Publication number: 20050176411Abstract: There is provided a mobile terminal with an international dialing operation function, which enables unfamiliar and troublesome conversion into an international telephone number to be performed with a simpler operation and which performs conversion into an appropriate telephone number according to the location where the terminal has moved. The mobile terminal identifies its location with a location identification section and determines whether an originating call is a call to the originator's country or to a foreign country according to the identified location. If the call is to a foreign country, an international prefix according to the identified location is identified. Furthermore, a country code is set to correspond to the originator's country, or it is identified from the inputted counterpart's telephone number and the like. Conversion into an international telephone number is performed using the country code, and then a call is originated.Type: ApplicationFiled: May 12, 2003Publication date: August 11, 2005Applicant: NTT DoCoMo, Inc.Inventors: Masaaki Taya, Motoshi Tamura
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Publication number: 20050106485Abstract: An object of the present invention is to provide a toner which allows fixation at low temperatures, which is excellent in anti-offset ability, and which provides a high quality image at high and low humidities in a stable manner without causing any image defect over time. Provided is a toner, containing at least a binder resin and a colorant in which: the binder resin in the toner contains 60% by mass or more of a styrene/acryl resin and a THF-insoluble fraction A which is an extraction residue obtained by carrying out Soxhlet extraction with tetrahydrofuran (THF) for 16 hours; the THF-insoluble fraction A contains a TOL-insoluble fraction B which is an extraction residue obtained by carrying out Soxhlet extraction with toluene (TOL) for 16 hours; and a mass ratio (B/A) between the THF-insoluble fraction A and the TOL-insoluble fraction B is in the range of 0.1?B/A?0.5.Type: ApplicationFiled: October 4, 2004Publication date: May 19, 2005Applicant: CANON KABUSHIKI KAISHAInventors: Katsuhisa Yamazaki, Masami Fujimoto, Masaaki Taya
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Publication number: 20040259012Abstract: In a toner having toner particles having at least a binder resin and a colorant, the binder resin in the toner contains at least i) a vinyl resin formed of a vinyl resin having at least a carboxyl group and a vinyl resin having at least an epoxy group, and having a cross-linked structure formed by the reaction of the carboxyl group of the former with the epoxy group of the latter, and ii) a copolymer having an aliphatic conjugated diene compound as a monomer component; and the binder resin in the toner has a THF-insoluble matter in a content of from 0.1% by weight to 60% by weight, and the copolymer having an aliphatic conjugated diene compound as a monomer component is incorporated in an o-dichlorobenzene-soluble matter of the THF-insoluble matter. This toner has superior developing stability and running performance in high-speed machines, and can keep fixing separation claws from contamination.Type: ApplicationFiled: March 26, 2004Publication date: December 23, 2004Inventors: Hiroyuki Fujikawa, Masami Fujimoto, Takakuni Kobori, Masaaki Taya
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Publication number: 20040009420Abstract: A toner is disclosed which is composed of toner particles containing at least a binder resin, a colorant and a wax, and an external additive. The wax has, in its DSC endothermic curve, a maximum endothermic peak at 55° C. to 80° C. within the temperature range from 30° C. to 160° C., the maximum endothermic peak having a half width of from 2° C. to 7° C., and the binder resin is composed chiefly of a polyester resin. The toner has a dynamic elastic modulus from 5×102 to 1×105 dN/m2 at 140° C., and its ratio to a dynamic elastic modulus at 170° C. is from 0.05 to 50, and the toner contains 10 to 20% by weight of THF-insoluble matter A of a binder resin component after 8 hours from the start of extraction and 1 to 10% by weight of THF-insoluble matter B of the binder resin component after 24 hours from the start of extraction, the ratio of A to B, B/A, being from 0.1 to 0.8. Also disclosed is a fixing method making use of this toner.Type: ApplicationFiled: July 10, 2002Publication date: January 15, 2004Inventors: Nobuyoshi Sugahara, Masaaki Taya, Junko Yoshikawa, Takayuki Itakura, Yojiro Hotta
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Patent number: 6670087Abstract: In a toner comprising a binder resin and a colorant, the toner contains as the binder resin at least a vinyl resin selected from the group consisting of i) a vinyl resin having a carboxyl group and a vinyl resin having an epoxy group, ii) a vinyl resin having a carboxyl group and an epoxy group and iii) a vinyl resin produced by the reaction of a carboxyl group with an epoxy group, and the toner has, in its dielectric dissipation factor (tan &dgr;), at least a maximum value and a minimum value in the temperature range of from 20° C. to 150° C., and, where the maximum value is represented by Max and the minimum value by Min, has a value of log10(Max/Min)≦2. Also disclosed are an image-forming apparatus, a process cartridge and an image-forming method which make use of the toner.Type: GrantFiled: November 5, 2001Date of Patent: December 30, 2003Assignee: Canon Kabushiki KaishaInventors: Hiroyuki Fujikawa, Masaaki Taya, Takakuni Kobori, Masami Fujimoto
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Publication number: 20020098431Abstract: In a toner comprising a binder resin and a colorant, the toner contains as the binder resin at least a vinyl resin selected from the group consisting of i) a vinyl resin having a carboxyl group and a vinyl resin having an epoxy group, ii) a vinyl resin having a carboxyl group and an epoxy group and iii) a vinyl resin produced by the reaction of a carboxyl group with an epoxy group, and the toner has, in its dielectric dissipation factor (tan &dgr;), at least a maximum value and a minimum value in the temperature range of from 20° C. to 150° C., and, where the maximum value is represented by Max and the minimum value by Min, has a value of log10(Max/Min)≦2. Also disclosed are an image-forming apparatus, a process cartridge and an image-forming method which make use of the toner.Type: ApplicationFiled: November 5, 2001Publication date: July 25, 2002Inventors: Hiroyuki Fujikawa, Masaaki Taya, Takakuni Kobori, Masami Fujimoto
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Patent number: 6326114Abstract: A toner includes at least a polyester resin having a carboxyl group, a coloring agent, 0.1-10 mass % of a metal salicylate compound with respect to a mass of the toner and 20-400 ppm of a hindered phenol with respect to the mass of the toner.Type: GrantFiled: April 13, 2000Date of Patent: December 4, 2001Assignee: Canon Kabushiki KaishaInventors: Takayuki Itakura, Masaaki Taya, Wakashi Iida, Junko Yoshikawa, Nobuyoshi Sugahara
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Patent number: 6316157Abstract: A non-metallic black toner is disclosed. The toner has toner particles containing at least a binder resin, a carbon black and an organometallic compound, and an external additive. The toner particles contain 10 to 200 ppm of at least one kind of alkali metal element and at least one kind of organometallic compound. The toner particles further contain a polyester resin. The non-metallic black toner has a weight-average particle diameter of 4 to 11 &mgr;m, the following loss tangents tan &dgr; shown by dielectric loss factor ∈″/dielectric constant ∈′ at frequencies of 5×104 Hz and 105 Hz: tan &dgr; (5×104 Hz)≦0.0125 tan &dgr; (105 Hz)≦0.0105, a Carr's flowability index of 50 or more, and a Carr's floodability index of 65 or more. Also, an image forming method is disclose using the black toner.Type: GrantFiled: July 5, 2000Date of Patent: November 13, 2001Assignee: Canon Kabushiki KaishaInventors: Junko Yoshikawa, Kenji Okado, Masaaki Taya, Yushi Mikuriya, Kazumi Yoshizaki, Yasushi Katsuta, Kenichi Nakayama
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Patent number: 6187490Abstract: A two-component developer suitable for electrophotography is formed of a toner and a resin-coated carrier. The resin-coated carrier is formed of carrier core particles and 0.01-2.0 wt. % based on the carrier core particles of a resin coating layer coating the carrier core particles. The resin-coated carrier has an average particle size of 25-55 &mgr;m and the carrier core particles comprise a ferrite component represented by formula (I) below: (Fe2O3)a(MnO)b(MgO)c(A)d (I), wherein A represents a mixture of SrO, CaO and Al2O3, and a, b, c and d are numbers representing mol fractions of associated components and satisfying: 0.4<a<0.6, 0.35<b<0.45, 0.07<c<0.12, 0.005<d<0.015, and a+b+c+d≦1. Because of the specific composition, the carrier core particles are provided with a smooth surface, which is reflected into a surface smoothness of the resin-coated carrier even after coated with a thin resin coating layer.Type: GrantFiled: March 15, 2000Date of Patent: February 13, 2001Assignee: Canon Kabushiki KaishaInventors: Masaaki Taya, Takaaki Kohtaki, Yasuhiro Ichikawa
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Patent number: 6022659Abstract: A yellow toner for developing electrostatic images is formed of yellow toner particles containing a binder resin and a yellow colorant. The yellow toner has a storage modulus G'.sub.180 at 180.degree. C. and a minimum storage modulus G'.sub.min(120-170) in a temperature range of 120-170.degree. C. giving a ratio [G'.sub.180 /G'.sub.min(120-170) ] of 2.0-8.0. The binder resin comprises a polyester resin having a glass transition temperature of 50-65.degree. C. and an acid value of 2.0-25.0 mgKOH/g. The yellow toner is a compound represented by Formula (1) below:Formula (1): ##STR1## The primary particles of the yellow colorant exhibit a length/breadth ratio of at most 1.5. The yellow colorant is dispersed in the toner particles as independent particles (including primary particles and secondary particles) providing a number-average particle size of 0.1-0.7 .mu.m. The yellow toner is provided with improved fixability and anti-offset property as well as good color toner performances.Type: GrantFiled: February 27, 1998Date of Patent: February 8, 2000Assignee: Canon Kabushiki KaishaInventors: Makoto Kanbayashi, Masaaki Taya, Wakashi Iida, Tetsuya Ida
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Patent number: 6013402Abstract: A color toner has (i) color toner particles containing at least a binder resin and a colorant and (ii) an external additive. The color toner has a weight-average particle diameter of 5 to 8 .mu.m and a number-average particle diameter of 4.5 to 7.5 .mu.m, and contains 5 to 40% by number of particles having a particle diameter of 4 .mu.m or less in the number distribution of the color toner and 7% by volume or less of particles having a particle diameter of 10.08 .mu.m or more in the volume distribution of the color toner. The inorganic powder selected from the group consisting of a strontium titanate powder, a cerium oxide powder and a calcium titanate powder, and a hydrophobic fine alumina powder are externally added to the color toner particles as the external additives, the inorganic powder has a longitudinal average particle diameter of 0.2 to 2 .mu.m, and the hydrophobic fine alumina powder has a longitudinal average particle diameter of 0.005 to 0.1 .mu.m.Type: GrantFiled: December 18, 1998Date of Patent: January 11, 2000Assignee: Canon Kabushiki KaishaInventors: Makoto Kanbayashi, Masaaki Taya, Wakashi Iida, Tetsuya Ida
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Patent number: 6001525Abstract: An electrophotographic two-component type developer includes a toner and a magnetic carrier showing stable charge-imparting performances for a long period of continuous image formation and wherein various environmental conditions. The magnetic carrier comprises: magnetic carrier core particles and a silicone resin coating the magnetic carrier core particles; wherein the silicone resin is characterized by having (i) both (a) a --COO-- group and (b) a phenyl group or nitrogen-containing group, (ii) a carbon content attributable to the --COO-- group of 10-70 atomic % of silicon constituting the silicone resin, based on ESCA, and (iii) a carbon content attributable to the phenyl group of 0.1-300 atomic % or a nitrogen content attributable to the nitrogen-containing group of 0.01-10 atomic %, respectively, of the carbon content attributable to the --COO-- group, based on ESCA.Type: GrantFiled: November 19, 1997Date of Patent: December 14, 1999Assignee: Canon Kabushiki KaishaInventors: Tetsuya Ida, Masaaki Taya, Makoto Kanbayashi
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Patent number: 5994018Abstract: A toner contains toner particles and fine alumina particles. The toner particles include a binding resin and a colorant. The fine alumina particles contain 200 to 700 .mu.g of zirconium compound per gram of alumina. The toner may be used as a one-component developer or as a two-component developer with a carrier.Type: GrantFiled: April 27, 1999Date of Patent: November 30, 1999Inventors: Wakashi Iida, Masaaki Taya, Makoto Kanbayashi, Tetsuya Ida, Junko Inaba
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Patent number: 5912099Abstract: A magenta toner for developing electrostatic images is formed of a binder resin, and a quinacridone pigment providing an X-ray diffraction spectrum showing two peaks in a Bragg angle (2.theta.) region of 5-10 deg. The magenta toner has an improved light fastness, may have a desired hue comparable to a printing process ink and is suitably used for electrophotographic full-color image formation. The magenta toner may preferably be formed through a process including a first kneading step starting from wet blending of a binder resin and two paste pigments including quinacridone and 2,9-dimethylquinacridone, respectively, under mild conditions not causing crystal transformation to form a master batch and a second kneading step of diluting the master batch together with other additive.Type: GrantFiled: August 4, 1997Date of Patent: June 15, 1999Assignee: Canon Kabushiki KaishaInventors: Makoto Kanbayashi, Masaaki Taya, Ryoichi Fujita, Wakashi Iida, Tetsuya Ida