Patents Assigned to Forestry and Forest Products Research Institute, Ministry of Agriculture, Forestry and Fisheries
  • Method for manufacturing lignin for carbon fiber spinning
    Patent number: 5344921
    Abstract: A method for manufacturing lignin for carbon fiber spinning, comprising subjecting to heat treatment in a non-oxidizing atmosphere a phenolated lignin obtained by phenolation of lignin dissolved out in delignification of a woody material, or a phenolated lignin derived from digestion of a woody material with a phenol.
    Type: Grant
    Filed: September 1, 1993
    Date of Patent: September 6, 1994
    Assignee: Forestry and Forest Products Research Institute, Ministry of Agriculture, Forestry and Fisheries
    Inventors: Kenichi Sudo, Kazumasa Shimizu
  • Process for producing wood adsorbents for mercury ions by graft polymerization of acrolein onto xanthated wood meal followed by conversion to thiosemicarbazone
    Patent number: 4258136
    Abstract: A novel wood adsorbent for mercury ions is provided by the process of this invention. The process comprises xanthating an alkali wood meal, impregnating the xanthated wood meal with a solution of a peroxide, graft copolymerizing the product with acrolein in gas phase, and converting acrolein aldehyde groups on the resulting graft copolymer to thiosemicarbazone to obtain the novel wood adsorbent for mercury ion. The novel wood adsorbent has a great adsorbing capacity for mercury ion.
    Type: Grant
    Filed: March 2, 1979
    Date of Patent: March 24, 1981
    Assignee: Forestry and Forest Products Research Institute, Ministry of Agriculture, Forestry and Fisheries
    Inventors: Yasuhiko Hirabayashi, Toshihiro Murayama