Patents by Inventor Jun Azuma

Jun Azuma 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).

  • Patent number: 10996575
    Abstract: A photosensitive layer included in an electrophotographic photosensitive member contains at least a charge generating material, a hole transport material, and a binder resin. The hole transport material includes a compound (1). The binder resin includes a polyarylate resin having at least one repeating unit (10) and at least one repeating unit (11). Alternatively, the binder resin includes a polycarbonate resin having a repeating unit (20) and a repeating unit (21).
    Type: Grant
    Filed: January 10, 2020
    Date of Patent: May 4, 2021
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Tomofumi Shimizu, Kazuaki Ezure, Hayase Yamamoto, Jun Azuma
  • Patent number: 10871723
    Abstract: An electrophotographic photosensitive member (1) includes a conductive substrate (2) and a photosensitive layer (3) disposed directly or indirectly on the conductive substrate (2). The photosensitive layer (3) has a charge generating layer (3a) and a charge transport layer (3b) disposed in order from the conductive substrate (2). The charge generating layer (3a) contains a charge generating material. The charge transport layer (3b) contains a charge transport material, a binder resin, and a pigment that absorbs light having an irradiation wavelength.
    Type: Grant
    Filed: December 28, 2017
    Date of Patent: December 22, 2020
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Kensuke Okawa, Seiki Hasunuma, Jun Azuma
  • Patent number: 10795273
    Abstract: A bis-butadiene derivative is represented by general formula (1) shown below. In general formula (1), Ra, Rb, and Rc each represent, independently of one another, an alkyl group having a carbon number of at least 1 and no greater than 8 or an alkoxy group having a carbon number of at least 1 and no greater than 8. l and m each represent, independently of one another, an integer of at least 0 and no greater than 5. n represents an integer of at least 0 and no greater than 4. Chemical groups Ra may be the same as or different from each other. Chemical groups Rb may be the same as or different from each other. Chemical groups Rc may be the same as or different from each other.
    Type: Grant
    Filed: June 17, 2019
    Date of Patent: October 6, 2020
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Jun Azuma, Kensuke Kojima
  • Patent number: 10761441
    Abstract: A method for producing an electrophotographic photosensitive member includes an electrically conductive substrate and a photosensitive layer. The method includes applying an application liquid for photosensitive layer formation containing a solvent, a binder resin, and a hole transport material directly or indirectly onto the electrically conductive substrate, and removing a portion of the solvent, to form the photosensitive layer. The solvent contains a first solvent that is an alcohol having a carbon number of at least 1 and no greater than 3, and a second solvent other than the first solvent.
    Type: Grant
    Filed: May 14, 2019
    Date of Patent: September 1, 2020
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Jun Azuma, Tomofumi Shimizu, Kenji Kitaguchi, Kiichiro Oji
  • Patent number: 10761439
    Abstract: An electrophotographic photosensitive member includes a photosensitive layer. The photosensitive layer contains a charge generating material, a hole transport material, and a binder resin. The binder resin contains a polyarylate resin represented by general formula (1). In general formula (1), r and s each represent an integer of at least 0 and no greater than 49 and t and u represents an integer of at least 1 and no greater than 50. Furthermore, r+s+t+u=100 and r+t=s+u. X and Y each represent, independently of one another, a divalent group represented by chemical formula (1-1), (1-2), (1-3), or (1-4).
    Type: Grant
    Filed: August 4, 2017
    Date of Patent: September 1, 2020
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Jun Azuma, Kensuke Okawa, Seiki Hasunuma, Tomofumi Shimizu
  • Patent number: 10761440
    Abstract: A photosensitive member (1) includes a conductive substrate (2) and a photosensitive layer (3). The photosensitive layer is a single-layer photosensitive layer (3c). The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The hole transport material includes a triphenylamine derivative represented by general formula (HT). The electron transport material includes a compound represented by general formula (ET1), (ET2), (ET3), (ET4), or (ET5).
    Type: Grant
    Filed: August 24, 2017
    Date of Patent: September 1, 2020
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Hiroki Tsurumi, Eiichi Miyamoto, Jun Azuma
  • Patent number: 10730819
    Abstract: A naphthalenedicarboxylic acid dichloride production method includes causing a reaction between naphthalenedicarboxylic acid and a chlorinating agent at a reaction temperature of 20° C. or higher and 75° C. or lower in presence of a solvent including tetrahydrofuran. The causing a reaction in the naphthalenedicarboxylic acid dichloride production method is preferably performed in presence of N,N-disubstituted formamide.
    Type: Grant
    Filed: September 18, 2019
    Date of Patent: August 4, 2020
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Jun Azuma
  • Patent number: 10732526
    Abstract: An electrophotographic photosensitive member (1) includes a conductive substrate (2) and a photosensitive layer (3). The photosensitive layer (3) is a single-layer photosensitive layer (3c) and contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The binder resin includes a polyarylate resin represented by general formula (1). In general formula (1), Q1, Q2, Q3, and Q4 each represent a methyl group or a hydrogen atom. r, s, t, and u each represent a number greater than or equal to 15 and less than or equal to 35.
    Type: Grant
    Filed: November 30, 2017
    Date of Patent: August 4, 2020
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Tomofumi Shimizu, Keiji Maruo, Jun Azuma
  • Publication number: 20200233321
    Abstract: An electrophotographic photosensitive member includes a conductive substrate, a charge generating layer, and a charge transport layer. The charge generating layer has a thickness of at least 0.07 ?m. The charge transport layer contains a binder resin, a hole transport material, and meta-terphenyl. The binder resin includes a polyarylate resin including repeating units and a group represented by respective general formulas (1) to (3). The electrophotographic photosensitive member satisfies at least two conditions of: (A) the charge generating layer has a thickness of at least 0.12 ?m; (B) the charge transport layer contains a specific amount of fluororesin particles; and (C) the charge transport layer contains meta-terphenyl in an amount of at least 5.0 parts by mass and no greater than 15.0 parts by mass relative to 100 parts by mass of the binder resin.
    Type: Application
    Filed: January 17, 2020
    Publication date: July 23, 2020
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Kazutaka SUGIMOTO, Kensuke OKAWA, Jun AZUMA
  • Publication number: 20200233324
    Abstract: A photosensitive layer included in an electrophotographic photosensitive member contains at least a charge generating material, a hole transport material, and a binder resin. The hole transport material includes a compound (1). The binder resin includes a polyarylate resin having at least one repeating unit (10) and at least one repeating unit (11). Alternatively, the binder resin includes a polycarbonate resin having a repeating unit (20) and a repeating unit (21).
    Type: Application
    Filed: January 10, 2020
    Publication date: July 23, 2020
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Tomofumi SHIMIZU, Kazuaki EZURE, Hayase YAMAMOTO, Jun AZUMA
  • Publication number: 20200231535
    Abstract: A compound is represented by general formula (1). In general formula (1), R1 and R2 each represent, independently of one another, a hydrogen atom, a methyl group, or an ethyl group, and a sum of the number of carbon atoms of the chemical group represented by R1 and the number of carbon atoms of the chemical group represented by R2 is 2. R3 and R4 each represent, independently of one another, a hydrogen atom, a methyl group, or an ethyl group, and a sum of the number of carbon atoms of the chemical group represented by R3 and the number of carbon atoms of the chemical group represented by R1 is 2. A photosensitive layer of an electrophotographic photosensitive member contains at least a charge generating material, a hole transport material, and a binder resin.
    Type: Application
    Filed: July 17, 2018
    Publication date: July 23, 2020
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Jun AZUMA, Kensuke KOJIMA, Tomofumi SHIMIZU, Hideki OKADA
  • Patent number: 10649351
    Abstract: An electrophotographic photosensitive member (1) includes a conductive substrate (2) and a photosensitive layer (3). The photosensitive layer (3) is a single-layer photosensitive layer (3c) and contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The binder resin includes a polyarylate resin represented by general formula (1). In general formula (1), Q1, Q2, Q3, and Q4 each represent a methyl group or a hydrogen atom. r, s, t, and u each represent a number greater than or equal to 15 and less than or equal to 35.
    Type: Grant
    Filed: November 30, 2017
    Date of Patent: May 12, 2020
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Tomofumi Shimizu, Jun Azuma, Keiji Maruo
  • Publication number: 20200117106
    Abstract: A compound mixture contains a mixture of a compound represented by general formula (1) and a compound represented by general formula (2). In the general formula (1), R1A, R2A, R3A, R4A, R5A, R6A, R7A, R8A, R9A, and R10A each represent, independently of one another, a hydrogen atom, an alkyl group having a carbon number of at least 1 and no greater than 8, an alkoxy group having a carbon number of at least 1 and no greater than 8, or an aryl group having a carbon number of at least 6 and no greater than 14.
    Type: Application
    Filed: October 4, 2019
    Publication date: April 16, 2020
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Jun AZUMA, Kensuke KOJIMA, Tomofumi SHIMIZU
  • Publication number: 20200115313
    Abstract: A naphthalenedicarboxylic acid dichloride production method includes causing a reaction between naphthalenedicarboxylic acid and a chlorinating agent at a reaction temperature of 20° C. or higher and 75° C. or lower in presence of a solvent including tetrahydrofuran. The causing a reaction in the naphthalenedicarboxylic acid dichloride production method is preferably performed in presence of N,N-disubstituted formamide.
    Type: Application
    Filed: September 18, 2019
    Publication date: April 16, 2020
    Applicant: KYOCERA Document Solutions Inc.
    Inventor: Jun AZUMA
  • Publication number: 20200026207
    Abstract: An electrophotographic photosensitive member (1) includes a conductive substrate (2) and a photosensitive layer (3) disposed directly or indirectly on the conductive substrate (2). The photosensitive layer (3) has a charge generating layer (3a) and a charge transport layer (3b) disposed in order from the conductive substrate (2). The charge generating layer (3a) contains a charge generating material. The charge transport layer (3b) contains a charge transport material, a binder resin, and a pigment that absorbs light having an irradiation wavelength. The binder resin includes a polyarylate resin including a repeating unit represented by general formula (1): In general formula (1), X and Y each represent, independently of one another, a divalent group represented by chemical formula (1-1).
    Type: Application
    Filed: December 28, 2017
    Publication date: January 23, 2020
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Kensuke OKAWA, Seiki HASUNUMA, Jun AZUMA
  • Publication number: 20190384190
    Abstract: A bis-butadiene derivative is represented by general formula (1) shown below. In general formula (1), Ra, Rb, and Rc each represent, independently of one another, an alkyl group having a carbon number of at least 1 and no greater than 8 or an alkoxy group having a carbon number of at least 1 and no greater than 8. l and m each represent, independently of one another, an integer of at least 0 and no greater than 5. n represents an integer of at least 0 and no greater than 4. Chemical groups Ra may be the same as or different from each other. Chemical groups Rb may be the same as or different from each other. Chemical groups Rc may be the same as or different from each other.
    Type: Application
    Filed: June 17, 2019
    Publication date: December 19, 2019
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Jun AZUMA, Kensuke KOJIMA
  • Patent number: 10509309
    Abstract: A polyarylate resin is represented by general formula (1) shown below. In general formula (1), R1 represents a hydrogen atom or methyl group. R2 and R3 each represent a hydrogen atom or an alkyl group having a carbon number of at least 1 and no greater than 4. R2 and R3 are not the same as one another. When R1 represents a hydrogen atom, R2 and R3 are not bonded to one another. When R1 represents a methyl group, R2 and R3 are optionally bonded to one another to form a ring. r and s each represent a number greater than or equal to 0 and less than or equal to 49. t and u each represent a number greater than or equal to 1 and less than or equal to 50. r+s+t+u=100. r+t=s+u.
    Type: Grant
    Filed: February 20, 2018
    Date of Patent: December 17, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Jun Azuma
  • Publication number: 20190354027
    Abstract: An electrophotographic photosensitive member (1) includes a conductive substrate (2) and a photosensitive layer (3). The photosensitive layer (3) is a single-layer photosensitive layer (3c) and contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The binder resin includes a polyarylate resin represented by general formula (1). In general formula (1), Q1, Q2, Q3, and Q4 each represent a methyl group or a hydrogen atom. r, s, t, and u each represent a number greater than or equal to 15 and less than or equal to 35.
    Type: Application
    Filed: November 30, 2017
    Publication date: November 21, 2019
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Tomofumi SHIMIZU, Jun AZUMA, Keiji MARUO
  • Publication number: 20190354028
    Abstract: A method of manufacturing an electrographic photoreceptor provided with a conductive substrate and a single-layered photosensitive layer is disclosed. The method includes: directly or indirectly applying a coating liquid for photosensitive layer formation onto the conductive substrate, the coating liquid containing a solvent, a charge generating agent, a binder resin, a hole transport material and an electron transport material; and removing part of the solvent to form the single-layered photosensitive layer. The solvent includes a first solvent as an alcohol with 1 to 3 carbon atoms and a second solvent as a solvent other than the first solvent. The binder resin includes a polyarylate resin as a polymerized product of monomers including a first monomer represented by General Formula (1) below and a second monomer represented by General Formula (2) below. The electron transport material includes a compound represented by General Formula (31), (32), (33) or (34) below.
    Type: Application
    Filed: May 2, 2019
    Publication date: November 21, 2019
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Tomofumi SHIMIZU, Jun AZUMA
  • Publication number: 20190354029
    Abstract: A method for producing an electrophotographic photosensitive member includes an electrically conductive substrate and a photosensitive layer. The method includes applying an application liquid for photosensitive layer formation containing a solvent, a binder resin, and a hole transport material directly or indirectly onto the electrically conductive substrate, and removing a portion of the solvent, to form the photosensitive layer. The solvent contains a first solvent that is an alcohol having a carbon number of at least 1 and no greater than 3, and a second solvent other than the first solvent.
    Type: Application
    Filed: May 14, 2019
    Publication date: November 21, 2019
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Jun AZUMA, Tomofumi SHIMIZU, Kenji KITAGUCHI, Kiichiro OJI