Patents by Inventor Naohiro Mikawa

Naohiro Mikawa 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).

  • Polyarylene sulfide, a process for the preparation thereof and a composition comprising the same
    Patent number: 5789533
    Abstract: A polyarylene sulfide in which a ratio of terminal --SX groups to a total of the terminal --SX groups and --SZn-- groups is less than 20 mole %, wherein X represents an alkali metal or a hydrogen atom, and which has a melt viscosity, V.sub.6 of 100 to 2,000 poises.Also disclosed are a composition comprising 100 parts of the above polyarylene sulfide, 0.01 to 20 parts of zeolite and 0.01 to 20 part of silica, and a process for the preparation of the above polyarylene sulfide.
    Type: Grant
    Filed: June 27, 1996
    Date of Patent: August 4, 1998
    Assignee: Tonen Chemical Corporation
    Inventors: Hidenori Yamanaka, Osamu Komiyama, Masaru Miyoshi, Yoshitaka Anazawa, Naohiro Mikawa, Kazuhiro Ichikawa
  • Biodegradable ethylene polymer having ester bonds in the main chain and process for production of the same
    Patent number: 5367033
    Abstract: An ethylene polymer which Is capable of being degraded by microorganisms is provided which comprises a recurring unit represented by the general formula ##STR1## in which R is a divalent hydrocarbon group containing 2 to 20 carbon atoms, R' is a divalent hydrocarbon group containing 1 to 20 carbon atoms and A is a polyethylene segment comprising a recurring unit represented by the formula --CH.sub.2.CH.sub.2 -- and having a number average molecular weight (Mn) of 300 to 300,000, and the ethylene polymer having a number average molecular weight (Mn) of 500 to 5,000,000.
    Type: Grant
    Filed: January 25, 1993
    Date of Patent: November 22, 1994
    Assignee: Tonen Corporation
    Inventors: Naohiro Mikawa, Satoshi Ueki, Naomi Koyama, Hiroyuki Furuhashi, Tetsuya Morioka, Shigeyuki Toki