Patents by Inventor Takashige Kasuya
Takashige Kasuya 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: 7368211Abstract: To provide a magnetic toner which is excellent in durability and developability even in the case of being applied to high-speed developing process or being used in a large-capacity process cartridge amount of toner in which is increased, and which has high degree of blackness. Provided is a magnetic toner having magnetic toner particles containing at least a binder resin and magnetic material particles each comprising a predetermined amount of a titanium compound, characterized in that: 1) the magnetic material particles have a predetermined amount of adsorbed moisture at a relative vapor pressure of 50%; and 2) a difference between the amount of moisture adsorbed to the magnetic material particles in an adsorbing process for increasing a relative vapor pressure and the amount of moisture adsorbed to the magnetic material particles in a desorbing process for reducing a relative vapor pressure is reduced.Type: GrantFiled: June 29, 2005Date of Patent: May 6, 2008Assignee: Canon Kabushiki KaishaInventors: Yusuke Hasegawa, Yoshihiro Ogawa, Shinichiro Abe, Junko Nishiyama, Takashige Kasuya
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Patent number: 7288354Abstract: A toner is composed of toner particles including toner base particles containing at least a binder resin and a colorant, and inorganic fine particles. The toner base particles having a specific circle-equivalent diameter as measured with a flow type particle image analyzer have a specific average circularity. The toner base particles have a specific surface roughness as measured with a scanning probe microscope. The binder resin contains at least a vinyl resin having as partial structure a linkage formed by the reaction of a carboxyl group with an epoxy group.Type: GrantFiled: July 30, 2004Date of Patent: October 30, 2007Assignee: Canon Kabushiki KaishaInventors: Shuhei Moribe, Nobuyuki Okubo, Tsutomu Onuma, Hideto Iida, Koji Nishikawa, Takashige Kasuya
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Patent number: 7273686Abstract: In a toner comprising toner particles which comprise toner base particles containing at least a binder resin and a magnetic material, and inorganic fine particles, the toner base particles have been obtained through a pulverization step; and, the toner base particles having a circle-equivalent diameter of from 3 ?m or more to 400 ?m or less as measured with a flow type particle image analyzer have an average circularity of from 0.935 or more to less than 0.970; and the toner base particles have an average surface roughness of from 5.0 nm or more to less than 35.0 nm as measured with a scanning probe microscope. The toner can enjoy less toner consumption per sheet of images, can achieve a long lifetime in a smaller quantity of toner, and has superior developing performance in any environment.Type: GrantFiled: July 29, 2004Date of Patent: September 25, 2007Assignee: Canon Kabushiki KaishaInventors: Tsutomu Onuma, Nobuyuki Okubo, Hideto Iida, Takashige Kasuya, Koji Nishikawa, Shuhei Moribe
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Patent number: 7267919Abstract: A toner of the present invention comprises at least a binder resin comprising as a main component a polyester resin, a wax, and a colorant, in which in case of measuring a wettability of the toner with respect to a mixed solvent of methanol and water in terms of an optical transimittance at an optical wavelength of 780 nm, a methanol concentration of the mixed solvent is in a range of 45 to 65% by volume when an optical transmittance is 80% and 10%, respectively; a melt index (MI) is of 0.1 to 10 g/10 min at a temperature of 125° C.Type: GrantFiled: March 20, 2006Date of Patent: September 11, 2007Assignee: Canon Kabushiki KaishaInventors: Syuhei Moribe, Hiroshi Yusa, Takashige Kasuya, Yoshihiro Ogawa
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Publication number: 20070202424Abstract: Provided is a magnetic toner comprising magnetic toner particles each comprising at least a binder resin and a magnetic iron oxide, the magnetic toner being excellent in developability and environmental stability, and being capable of reducing a toner consumption. A saturation magnetization ?s and a remanent magnetization ?r of the magnetic toner in a measured magnetic field of 795.8 kA/m are arranged in the range of 5 to 60 Am2/kg and in the range of 0.1 to 10.0 Am2/kg, respectively, and the binder resin having a polyester component polymerized by using a Ti chelate compound as a catalyst is used.Type: ApplicationFiled: April 30, 2007Publication date: August 30, 2007Applicant: CANON KABUSHIKI KAISHAInventors: Yoshihiro Ogawa, Takashige Kasuya, Syuhei Moribe, Kouji Nishikawa
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Patent number: 7241547Abstract: A toner exhibits excellent image characteristics, and also has an excellent charging property even if the toner is used in a cleaning-simultaneous-with-developing system having a direct injection charging mechanism. The toner includes toner particles and non-magnetic metallic-compound fine particles. The weight average particle diameter of the toner is 3.0 ?m to 12.0 ?m. The metallic-compound fine particles are conductive metallic-compound fine particles having a specific surface area (cm2/cm3) of 5×105 to 100×105; a medium diameter (D50) of 0.4 ?m to 4.0 ?m with respect to a volume-based particle diameter distribution, the medium diameter (D50) being smaller than the weight average particle diameter of the toner; and a 90% particle diameter D90 of 6.0 ?m or less with respect to a volume-based particle diameter.Type: GrantFiled: July 13, 2006Date of Patent: July 10, 2007Assignee: Canon Kabushiki KaishaInventors: Tsuyoshi Takiguchi, Yosuke Morikawa, Takashige Kasuya, Kimihiro Yoshimura, Katsuhisa Yamazaki, Kaori Hiratsuka
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Patent number: 7238387Abstract: Hydrophobic inorganic fine particles characterized by being a mixture of at least small-particle-diameter inorganic fine particles having an average primary particle diameter of 5 to 25 nm and having a maximum peak particle diameter of 20 nm or less and large-particle-diameter inorganic fine particles having an average primary particle diameter which is 1.5 to 100 times the average primary particle diameter of the small-particle-diameter inorganic fine particles; the mixture being a mixture having been treated in the same treating tank to subject both the small-particle-diameter inorganic fine particles and large-particle-diameter inorganic fine particles simultaneously to hydrophobic treatment.Type: GrantFiled: May 26, 2004Date of Patent: July 3, 2007Assignee: Canon Kabushiki KaishaInventors: Yoshihiro Ogawa, Takashige Kasuya, Kaori Hiratsuka
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Publication number: 20070147886Abstract: A toner exhibits excellent image characteristics, and also has an excellent charging property even if the toner is used in a cleaning-simultaneous-with-developing system having a direct injection charging mechanism. The toner includes toner particles and non-magnetic metallic-compound fine particles. The weight average particle diameter of the toner is 3.0 ?m to 12.0 ?m. The metallic-compound fine particles are conductive metallic-compound fine particles having a specific surface area (cm2/cm3) of 5×105 to 100×105; a medium diameter (D50) of 0.4 ?m to 4.0 ?m with respect to a volume-based particle diameter distribution, the medium diameter (D50) being smaller than the weight average particle diameter of the toner; and a 90% particle diameter D90 of 6.0 ?m or less with respect to a volume-based particle diameter.Type: ApplicationFiled: March 5, 2007Publication date: June 28, 2007Applicant: CANON KABUSHIKI KAISHAInventors: Tsuyoshi TAKIGUCHI, Yosuke Morikawa, Takashige Kasuya, Kimihiro Yoshimura, Katsuhisa Yamazaki, Kaori Hiratsuka
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Publication number: 20070148577Abstract: Hydrophobic inorganic fine particles characterized by being a mixture of at least small-particle-diameter inorganic fine particles having an average primary particle diameter of 5 to 25 nm and having a maximum peak particle diameter of 20 nm or less and large-particle-diameter inorganic fine particles having an average primary particle diameter which is 1.5 to 100 times the average primary particle diameter of the small-particle-diameter inorganic fine particles; the mixture being a mixture having been treated in the same treating tank to subject both the small-particle-diameter inorganic fine particles and large-particle-diameter inorganic fine particles simultaneously to hydrophobic treatment.Type: ApplicationFiled: March 2, 2007Publication date: June 28, 2007Applicant: CANON KABUSHIKI KAISHAInventors: Yoshihiro Ogawa, Takashige Kasuya, Kaori Hiratsuka
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Publication number: 20070059049Abstract: An image forming method having the steps of controlling the layer thickness of a toner on a toner bearing member by means of a toner regulating blade, and developing with the toner an electrostatic latent image formed on an electrostatic latent image bearing member, the toner regulating blade has, at its part to be kept in touch with the toner bearing member, a specific ten-point average roughness Rz and a specific ratio (area of contact portion/area of non-contact portion) at a specific face pressure, and the toner has a specific average circularity and has a specific aerated bulk density. This image forming method promises superior developing performance in any environment, can keep sleeve negative ghost from occurring and can keep toner melt adhesion to toner regulating blade and toner melt adhesion to toner bearing member from occurring.Type: ApplicationFiled: June 22, 2006Publication date: March 15, 2007Applicant: Canon Kabushiki KaishaInventors: Tsutomu Onuma, Yoshihiro Ogawa, Yusuke Hasegawa, Koji Nishikawa, Tomohisa Sano, Junko Nishiyama, Miho Okazaki, Takashige Kasuya
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Patent number: 7150953Abstract: A developer capable of providing an excellent image without causing a charging failure even after a long-term and repeated use contains a toner particle having a binder resin and a colorant, an inorganic fine particle, and a conductive fine particle, in which a volume average particle diameter Da of the conductive fine particle and an number average primary particle diameter Db of the inorganic fine particle satisfy the expression (1) below, and a rate of liberation “a” of the conductive fine particle from the toner particle is 40 to 95% and a rate of liberation “b” of the inorganic fine particle from the toner particle is 0.1 to 5% Da?10Db.Type: GrantFiled: September 12, 2003Date of Patent: December 19, 2006Assignee: Canon Kabushiki KaishaInventors: Katsuhisa Yamazaki, Takashige Kasuya, Tsuyoshi Takiguchi, Kaori Hiratsuka
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Patent number: 7141343Abstract: A toner exhibits excellent image characteristics, and also has an excellent charging property even if the toner is used in a cleaning-simultaneous-with-developing system having a direct injection charging mechanism. The toner includes toner particles and non-magnetic metallic-compound fine particles. The weight average particle diameter of the toner is 3.0 ?m to 12.0 ?m. The metallic-compound fine particles are conductive metallic-compound fine particles having a specific surface area (cm2/cm3) of 5×105 to 100×105; a medium diameter (D50) of 0.4 ?m to 4.0 ?m with respect to a volume-based particle diameter distribution, the medium diameter (D50) being smaller than the weight average particle diameter of the toner; and a 90% particle diameter D90 of 6.0 ?m or less with respect to a volume-based particle diameter.Type: GrantFiled: April 18, 2003Date of Patent: November 28, 2006Assignee: Canon Kabushiki KaishaInventors: Tsuyoshi Takiguchi, Yosuke Morikawa, Takashige Kasuya, Kimihiro Yoshimura, Katsuhisa Yamazaki, Kaori Hiratsuka
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Publication number: 20060263710Abstract: A magnetic toner including at least: a binder resin; and a magnetic body, in which, when magnetization at a magnetic field strength of 397.9 kA/m and a coercive force of the magnetic toner are denoted by ?s (Am2/kg) and Hc (kA/m), respectively, a magnetic field strength at which the magnetic toner shows a magnetization value equal to 95% of ?s is denoted by H95% (kA/m), and a number average particle size of the magnetic body is denoted by d (?m), H95%, Hc, and d satisfy the following expressions. 151<H95%<200??(1) 7.Type: ApplicationFiled: May 3, 2006Publication date: November 23, 2006Applicant: CANON KABUSHIKI KAISHAInventors: Yusuke Hasegawa, Yoshihiro Ogawa, Junko Nishiyama, Miho Okazaki, Takashige Kasuya, Tomohisa Sano
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Publication number: 20060257772Abstract: A toner exhibits excellent image characteristics, and also has an excellent charging property even if the toner is used in a cleaning-simultaneous-with-developing system having a direct injection charging mechanism. The toner includes toner particles and non-magnetic metallic-compound fine particles. The weight average particle diameter of the toner is 3.0 ?m to 12.0 ?m. The metallic-compound fine particles are conductive metallic-compound fine particles having a specific surface area (cm2/cm3) of 5×105 to 100×105; a medium diameter (D50) of 0.4 ?m to 4.0 ?m with respect to a volume-based particle diameter distribution, the medium diameter (D50) being smaller than the weight average particle diameter of the toner; and a 90% particle diameter D90 of 6.0 ?m or less with respect to a volume-based particle diameter.Type: ApplicationFiled: July 13, 2006Publication date: November 16, 2006Applicant: CANON KABUSHIKI KAISHAInventors: Tsuyoshi Takiguchi, Yosuke Morikawa, Takashige Kasuya, Kimihiro Yoshimura, Katsuhisa Yamazaki, Kaori Hiratsuka
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Publication number: 20060240352Abstract: The invention is to provide a toner excellent in fixing property, high-temperature offset resistance and blocking resistance, and having an excellent developing property. The invention provides a toner including at least a binder resin and a colorant, wherein: the binder resin contains a hybrid resin which contains a polyester-type resin unit by 50 mass % or more and in which a polyester-type resin component and a vinyl-type resin component are chemically bonded; the toner contains 3 to 50 mass % of a tetrahydrofuran-insoluble matter derived from the binder resin; the tetrahydrofuran-insoluble matter contains a hybrid resin; and a tetrahydrofuran-soluble matter, obtained by hydrolyzing the tetrahydrofuran-insoluble matter and separating by filtration, has, in a GPC-measured molecular weight distribution, a main peak within a molecular weight range of 50,000 to 500,000.Type: ApplicationFiled: April 20, 2006Publication date: October 26, 2006Applicant: CANON KABUSHIKI KAISHAInventors: Yoshihiro Ogawa, Yusuke Hasegawa, Tomohisa Sano, Junko Nishiyama, Miho Okazaki, Takashige Kasuya, Koji Nishikawa
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Patent number: 7097951Abstract: A toner of the present invention comprises at least a binder resin comprising as a main component a polyester resin, a wax, and a colorant, in which in case of measuring a wettability of the toner with respect to a mixed solvent of methanol and water in terms of an optical transimittance at an optical wavelength of 780 nm, a methanol concentration of the mixed solvent is in a range of 45 to 65% by volume when an optical transmittance is 80% and 10%, respectively; a melt index (MI) is of 0.1 to 10 g/10 min at a temperature of 125° C.Type: GrantFiled: August 29, 2005Date of Patent: August 29, 2006Assignee: Canon Kabushiki KaishaInventors: Syuhei Moribe, Hiroshi Yusa, Takashige Kasuya, Yoshihiro Ogawa
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Publication number: 20060177753Abstract: A toner of the present invention comprises at least a binder resin comprising as a main component a polyester resin, a wax, and a colorant, in which in case of measuring a wettability of the toner with respect to a mixed solvent of methanol and water in terms of an optical transimittance at an optical wavelength of 780 nm, a methanol concentration of the mixed solvent is in a range of 45 to 65% by volume when an optical transmittance is 80% and 10%, respectively; a melt index (MI) is of 0.1 to 10 g/lO min at a temperature of 125° C.Type: ApplicationFiled: March 20, 2006Publication date: August 10, 2006Applicant: CANON KABUSHIKI KAISHAInventors: Syuhei Moribe, Hiroshi Yusa, Takashige Kasuya, Yoshihiro Ogawa
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Publication number: 20060078812Abstract: To provide a magnetic toner which is excellent in durability and developability even in the case of being applied to high-speed developing process or being used in a large-capacity process cartridge amount of toner in which is increased, and which has high degree of blackness. Provided is a magnetic toner having magnetic toner particles containing at least a binder resin and magnetic material particles each comprising a predetermined amount of a titanium compound, characterized in that: 1) the magnetic material particles have a predetermined amount of adsorbed moisture at a relative vapor pressure of 50%; and 2) a difference between the amount of moisture adsorbed to the magnetic material particles in an adsorbing process for increasing a relative vapor pressure and the amount of moisture adsorbed to the magnetic material particles in a desorbing process for reducing a relative vapor pressure is reduced.Type: ApplicationFiled: June 29, 2005Publication date: April 13, 2006Applicant: CANON KABUSHIKI KAISHAInventors: Yusuke Hasegawa, Yoshihiro Ogawa, Shinichiro Abe, Junko Nishiyama, Takashige Kasuya
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Publication number: 20060078811Abstract: According to the present invention, a magnetic toner comprising magnetic toner particles including at least a binder resin and magnetic particles is provided, wherein an isoelectric point of the magnetic particles is pH 4.0 or less, in order to provide a magnetic toner stably having an optimum charged amount regardless of environments so that a high-quality image having high blackness can be formed without causing any ghost phenomenon.Type: ApplicationFiled: June 29, 2005Publication date: April 13, 2006Applicant: CANON KABUSHIKI KAISHAInventors: Junko Nishiyama, Yoshihiro Ogawa, Yusuke Hasegawa, Shinichiro Abe, Takashige Kasuya
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Patent number: 7001703Abstract: A toner of the present invention comprises at least a binder resin comprising as a main component a polyester resin, a wax, and a colorant, in which in case of measuring a wettability of the toner with respect to a mixed solvent of methanol and water in terms of an optical transimittance at an optical wavelength of 780 nm, a methanol concentration of the mixed solvent is in a range of 45 to 65% by volume when an optical transmittance is 80% and 10%, respectively; a melt index (MI) is of 0.1 to 10 g/10 min at a temperature of 125° C.Type: GrantFiled: September 25, 2003Date of Patent: February 21, 2006Assignee: Canon Kabushiki KaishaInventors: Syuhei Moribe, Hiroshi Yusa, Takashige Kasuya, Yoshihiro Ogawa