Invention Grant
US08349063B2 Pencil lead and production process for the same 有权
铅笔铅和生产过程相同

  • Patent Title: Pencil lead and production process for the same
  • Patent Title (中): 铅笔铅和生产过程相同
  • Application No.: US13265476
    Application Date: 2010-04-22
  • Publication No.: US08349063B2
    Publication Date: 2013-01-08
  • Inventor: Satoru BanzaiKatsunori Kitazawa
  • Applicant: Satoru BanzaiKatsunori Kitazawa
  • Applicant Address: JP Shinagawa-Ku, Tokyo
  • Assignee: Mitsubishi Pencil Company, Limited
  • Current Assignee: Mitsubishi Pencil Company, Limited
  • Current Assignee Address: JP Shinagawa-Ku, Tokyo
  • Agency: Buchanan Ingersoll & Rooney PC
  • Priority: JP2009-106112 20090424; JP2009-106113 20090424; JP2009-106114 20090424; JP2009-106115 20090424; JP2009-106116 20090424; JP2009-106117 20090424; JP2010-051954 20100309; JP2010-051955 20100309; JP2010-051956 20100309; JP2010-051957 20100309; JP2010-051958 20100309; JP2010-051959 20100309
  • International Application: PCT/JP2010/057159 WO 20100422
  • International Announcement: WO2010/123070 WO 20101028
  • Main IPC: C09D13/00
  • IPC: C09D13/00
Pencil lead and production process for the same
Abstract:
A pencil lead containing flake graphite which has an ab face having a flatness of at least 2 μm or less and in which an aspect ratio of an a axis or a b axis in the ab face to a c axis is 5 or more is provided with a structure in which nanoparticles having a mv value of 0.05 to 2 based on 100 of a volume average diameter (mv value) of the graphite and having a sphericity of 0.1 to 20 nm or nanoparticles having a mv value of 0.05 to 2 based on 100 of a volume average diameter (mv value) of the graphite and having a specific surface area of 200 to 600 m2/g are brought into contact with the ab face of the graphite or a structure in which they are adhered to the ab face of the graphite.
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