Patents Examined by Christopher Rodee
  • Patent number: 9834683
    Abstract: The present invention provides a compound and a pigment dispersant, each of which improves the dispersibility of various types of pigments in a non-aqueous solvent and also provides a pigment composition, a pigment dispersion, and a toner, each of which has a preferable coloring power. The compound includes a polymer which has a monomer unit having a specific structure and also includes a specific partial structure.
    Type: Grant
    Filed: August 27, 2014
    Date of Patent: December 5, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventors: Chiaki Nishiura, Yuki Tsujii, Yasuaki Murai, Takayuki Toyoda, Waka Hasegawa, Masanori Seki, Masashi Kawamura, Masashi Hirose, Ayano Mashida
  • Patent number: 9829816
    Abstract: Provided is a toner for which the heat-resistant storability and the low-temperature fixability are able to co-exist at higher levels and for which the temporal stability of the low-temperature fixability is also excellent. The toner has a toner particle that contains a binder resin and a pigment, and this binder resin contains a polyester resin that has a specific structure and specific properties.
    Type: Grant
    Filed: June 11, 2015
    Date of Patent: November 28, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Masatake Tanaka, Yoshihiro Nakagawa, Naoya Isono, Tsutomu Shimano, Shintaro Noji, Yu Yoshida, Takeshi Kaburagi, Shohei Shibahara
  • Patent number: 9804518
    Abstract: An electrostatic charge image developing toner includes toner particles containing a binder resin, a colorant, and 5?-chloro-3-hydroxy-2?-methoxy-2-naphthanilide, wherein the colorant contains at least one of Pigment Red 238 and Pigment Red 269, the content of the colorant is from 1% by weight to 20% by weight, and the content of 5?-chloro-3-hydroxy-2?-methoxy-2-naphthanilide is from 1 ppm to 300 ppm based on the weight.
    Type: Grant
    Filed: November 11, 2015
    Date of Patent: October 31, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Akira Matsumoto, Shinya Nakashima, Masaki Iwase
  • Patent number: 9804516
    Abstract: A toner includes a base particle; and an external additive covering the base particle. The toner includes a tetrahydrofuran (THF)-insoluble component having a glass transition temperature determined from a DSC curve when heated for the second time of from ?50° C. to 10° C. and an average circularity not greater than 0.98, and satisfies the following relation: Bt?0.025×Ct?1.80 wherein Bt represents a BET specific surface area [m2/g]; and Ct represents a coverage [%] of the external additive covering the base particle.
    Type: Grant
    Filed: April 21, 2016
    Date of Patent: October 31, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Keiji Makabe, Tsuneyasu Nagatomo, Kohsuke Satoh, Junichi Watanabe, Kenji Yoneda, Daichi Hisakuni
  • Patent number: 9798265
    Abstract: The present invention can provide a liquid developer that can accommodate faster process speeds by image forming apparatuses, in which the liquid developer contains a toner particle comprising a polyester resin, and a carrier liquid having a vinyl ether compound. The liquid developer further contains a polymer compound having a structural unit represented by formula (1) in either of the toner particle or the carrier liquid.
    Type: Grant
    Filed: May 27, 2016
    Date of Patent: October 24, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kei Inoue, Kenji Nishiguchi
  • Patent number: 9798261
    Abstract: The present disclosure relates to a chemically prepared toner composition including a toner particle having a core including a first polymer binder, an styrene acrylate encapsulated wax latex, a pigment, and a shell formed around the core including a second polymer binder and method to make the same. The disclosed method of preparing the toner results in a change in the distribution of the components of the toner particle wherein the lower molecular weight resins, the pigment, and the wax are located away from the surface of the toner particle and the pigment is clinging to the edge of the wax domain.
    Type: Grant
    Filed: November 10, 2015
    Date of Patent: October 24, 2017
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Jing X Sun, Cory Nathan Hammond
  • Patent number: 9791792
    Abstract: An electrophotographic photosensitive member includes a surface layer with a hexagonal boron nitride dispersed therein. The hexagonal boron nitride has a graphitization index (GI) of at least 3.0 and less than 15.0.
    Type: Grant
    Filed: April 18, 2016
    Date of Patent: October 17, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yohei Miyauchi, Kimihiro Yoshimura, Harunobu Ogaki, Atsushi Okuda, Yuki Yamamoto, Wataru Kitamura, Mai Murakami
  • Patent number: 9791797
    Abstract: A toner composition including a toner particle having a surface, wherein the toner particle comprises at least one toner resin; a metallic pigment bonded to the surface of the toner particle; and an insulative surface additive disposed over the metallic pigment.
    Type: Grant
    Filed: March 11, 2016
    Date of Patent: October 17, 2017
    Assignee: Xerox Corporation
    Inventors: Varun Sambhy, Juan A. Morales Tirado, Kirk L. Stamp
  • Patent number: 9766562
    Abstract: A photoconductor including: a conductive support; an undercoat layer; and a photoconductive layer, the undercoat layer being disposed over the conductive support, the photoconductive layer being disposed over the undercoat layer, wherein the undercoat layer includes zinc oxide particles, wherein when a film thickness of the undercoat layer is 20 ?m, the undercoat layer has transmittance of 50% or more to light having a wavelength in a range of 500 nm or more but 800 nm or less, wherein a lowest transmittance of light is 85% or less in the range, and wherein when an electric field of 5 V/?m is applied to the undercoat layer, volume resistivity of the undercoat layer is 1.0×107 ?·cm or more but 5.0×108 ?·cm or less at an environment of 23° C. and 55% RH.
    Type: Grant
    Filed: May 2, 2016
    Date of Patent: September 19, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshihiro Ishida, Eiji Kurimoto, Tetsuro Suzuki, Tomoharu Asano, Daisuke Nii
  • Patent number: 9760030
    Abstract: An electrophotographic photosensitive member includes a laminated body, the laminated body including a support, an undercoat layer, and a charge generating layer. The undercoat layer includes a polymerized product of a composition including an electron transport material represented by formula (1), a cross-linking agent, and a thermoplastic resin having a polymerizable functional group, the laminated body satisfying expressions (2) and (3) Z1—X—Z2??(1) 0.20?|Vd2?Vd1|?2.0??(2) ??10??(3) in which Z1 and Z2 are groups having electron transport property, X is a linker, Vd2 and Vd1 are surface potentials of the charge generating layer after charging and ? is transit time based on a change rate of the surface of the charge generating layer, each as defined in the specification.
    Type: Grant
    Filed: October 19, 2015
    Date of Patent: September 12, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Michiyo Sekiya, Kunihiko Sekido, Kei Tagami, Masashi Nishi
  • Patent number: 9751872
    Abstract: This invention aims at providing a compound capable of providing a toner having high covering power and a toner having high covering power, which is achieved by an azamethine acetyl amide-based compound having a specific structure.
    Type: Grant
    Filed: June 29, 2016
    Date of Patent: September 5, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventor: Akiko Kitao
  • Patent number: 9746816
    Abstract: The invention is to provide an image forming apparatus and an electrophotographic cartridge, which are free from problems of cleaning failure, filming, soiling, residual images (ghosts), fogging, density reduction, noise and the like and which can provide high-definition images even when a toner having a small particle size and having a high degree of circularity is used and even when a photoreceptor having a small outer diameter is used.
    Type: Grant
    Filed: February 23, 2011
    Date of Patent: August 29, 2017
    Assignee: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Tadashi Mizushima, Akiteru Fujii, Takayuki Shoda
  • Patent number: 9740122
    Abstract: The present toner is an electrostatic latent image developing toner, and contains a toner base particle. The toner base particle contains a binder resin and a release agent. The binder resin contains a crystalline resin and a vinyl resin. When the storage elastic modulus G? at 50° C. is defined as G?50° C., the peak top temperature (° C.) of a specific endothermic peak in DSC of the toner is defined as Tm, the measurement temperature (° C.) at a G? of 1×106 Pa is defined as TmA, and the measurement temperature (° C.) at a G? of 1×105 Pa is defined as TmB, the toner satisfies the following expressions (1) to (3): G?50° C.?1×108??(1) TmB?TmA?8??(2) Tm<TmB??(3).
    Type: Grant
    Filed: September 22, 2016
    Date of Patent: August 22, 2017
    Assignee: KONICA MINOLTA, INC.
    Inventors: Takaki Kawamura, Aya Shirai, Kaori Fujino
  • Patent number: 9733582
    Abstract: The present disclosure relates to a chemically prepared toner composition including a toner particle having a core including a first polymer binder, an styrene acrylate encapsulated wax latex, a pigment, and a shell formed around the core including a second polymer binder and method to make the same. The disclosed method of preparing the toner results in a change in the distribution of the components of the toner particle wherein the lower molecular weight resins, the pigment, and the wax are located away from the surface of the toner particle and the pigment is clinging to the edge of the wax domain.
    Type: Grant
    Filed: November 10, 2015
    Date of Patent: August 15, 2017
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Jing X Sun, Cory Nathan Hammond
  • Patent number: 9726997
    Abstract: An electrostatic charge image developing toner includes toner particles containing crosslinked resin particles having a glass transition temperature of 55° C. or higher in a surface layer of the toner particle, and silica particles having a volume average particle diameter of 30 nm to 300 nm and a coverage with respect to the toner particle from 50% to 100%.
    Type: Grant
    Filed: January 20, 2015
    Date of Patent: August 8, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Asafumi Fujita, Narumasa Sato, Eisuke Iwazaki, Tomoaki Tanaka, Kotaro Yoshihara, Noriyuki Mizutani
  • Patent number: 9720339
    Abstract: A toner including at least a crystalline resin as a binder resin, wherein a tetrahydrofuran soluble content of the toner includes 5.0% or more as a peak area of a component having a molecular weight of 100,000 or greater in a molecular weight distribution measured by gel permeation chromatography, and the tetrahydrofuran soluble content of the toner has a weight-average molecular weight of 20,000 to 60,000.
    Type: Grant
    Filed: July 26, 2016
    Date of Patent: August 1, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Shingo Sakashita, Shinya Nakayama, Masahide Yamada, Atsushi Yamamoto, Hideyuki Santo, Yukiko Nakajima, Suzuka Amemori
  • Patent number: 9715185
    Abstract: An electrostatic-image developing toner includes a toner particle including a polyester resin and a styrene-(meth)acrylic resin, and an external additive including a poly[alkyl (meth)acrylate] particle. The amount of the poly[alkyl (meth)acrylate] particles is about 0.05 parts by mass or more and about 1.0 parts by mass or less relative to 100 parts by mass of the toner particle. The ratio D50P/D50T of the number-average diameter D50P of the poly[alkyl (meth)acrylate] particles to the number-average diameter D50T of the toner particles satisfies 0.03?D50P/D50T?0.15. The proportion of the styrene-(meth)acrylic resin in a resin component deposited on the surface of the toner particle is about 5 atom % or more and about 30 atom % or less as determined by X-ray photoelectron spectroscopy (XPS).
    Type: Grant
    Filed: November 6, 2015
    Date of Patent: July 25, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yuka Kawamoto, Kotaro Yoshihara, Daisuke Ishizuka, Asafumi Fujita, Narumasa Sato, Erina Saito
  • Patent number: 9715188
    Abstract: The toner comprising a toner particle containing a binder resin and a colorant, an iron oxide particle and an organic-inorganic composite fine particle, wherein the organic-inorganic composite fine particle comprises a vinyl resin particle, and inorganic fine particles which are embedded in the vinyl resin particle, and at least a part of which is exposed at surface of the organic-inorganic composite fine particle; the organic-inorganic composite fine particle has convexes derived from the inorganic fine particles, and wherein: a coverage ratio of the surface of the organic-inorganic composite fine particle with the inorganic fine particle is 20-70%; and the content of the iron oxide particle present on a surface of the toner particle is 0.1-5.0 mass % based on the mass of the toner particle.
    Type: Grant
    Filed: July 30, 2014
    Date of Patent: July 25, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kazuo Terauchi, Koji Nishikawa, Shohei Tsuda, Yojiro Hotta, Katsuhisa Yamazaki, Takayuki Itakura, Takeshi Naka, Motohide Shiozawa
  • Patent number: 9709912
    Abstract: A toner is provided. The toner includes a crystalline resin and a non-crystalline resin, and has a thermal property such that when the toner is heated after being firstly heated to 60° C. followed by cooling in differential scanning calorimetry (DSC), the toner has a clear peak specific to melting of the crystalline resin at a temperature T1, and when the toner is heated after being firstly heated to 80° C. followed by cooling in the differential scanning calorimetry (DSC), the toner does not have a clear peak specific to melting of the crystalline resin at a temperature not higher than the temperature T1.
    Type: Grant
    Filed: October 1, 2013
    Date of Patent: July 18, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Kazuoki Fuwa, Takuya Kadota, Yoshihiro Mikuriya, Tsuyoshi Nozaki, Yoshimichi Ishikawa, Yuta Takeuchi, Tomohiro Fukao, Tomoharu Miki, Takayuki Nakamura
  • Patent number: 9709907
    Abstract: An electrophotographic photosensitive member can provide images in which black spots and fogging are suppressed and density unevenness due to coating unevenness of the charge generation layer is suppressed. The charge generation layer of the electrophotographic photosensitive member contains a gallium phthalocyanine crystal, a nitrogen-containing heterocyclic compound, and an amide compound represented by a formula (1), and a nitrogen atom in a heterocyclic ring of the nitrogen-containing heterocyclic compound has a substituent.
    Type: Grant
    Filed: June 11, 2015
    Date of Patent: July 18, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kaname Watariguchi, Masato Tanaka, Masataka Kawahara, Jumpei Kuno, Tsutomu Nishida