Title:
MICROFIBROUS CARBON SUBSTANCE ORIGINATING IN CELLULOSE MATERIAL AND PROCESS FOR PRODUCING THE SAME
Document Type and Number:
WIPO Patent Application WO/2003/025271
Kind Code:
A1
Abstract:
To prevent microfibrils in a cellulose material from disintegration, cellulose is dried and then carbonized or graphitized while avoiding factors causative of the disintegration, i.e., the effect of surface tension of water contained in the cellulose and crystallization of the water during freezing. Drying can be carried out by one of the following methods: (1) critical point drying after swelling the cellulose material in, for example, liquid carbon dioxide&semi (2) heat drying or freeze drying after swelling the cellulose material in an organic solvent&semi and (3) quick freeze drying while avoiding the formation of ice crystals after swelling the cellulose material in, for example, water. By carbonizing or graphitizing the thus dried material, aggregation among microfibrils or disintegration of the microfibril structure can be prevented, which makes it possible to process a bar−type or network microfibrous carbon material in a state of preserving microfibrils.
Inventors:
KUGA SHIGENORI (JP)
KIM DAE-YOUNG (KR)
NISHIYAMA YOSHIHARU (JP)
KIM DAE-YOUNG (KR)
NISHIYAMA YOSHIHARU (JP)
Application Number:
PCT/JP2002/009280
Publication Date:
March 27, 2003
Filing Date:
September 11, 2002
Export Citation:
Assignee:
KUGA SHIGENORI (JP)
KIM DAE-YOUNG (KR)
NISHIYAMA YOSHIHARU (JP)
KIM DAE-YOUNG (KR)
NISHIYAMA YOSHIHARU (JP)
International Classes:
D06B15/00; C01B31/04; D01F9/16; (IPC1-7): D01F9/16
Domestic Patent References:
| WO1986003455A1 | 1986-06-19 |
Foreign References:
| GB1167007A | 1969-10-15 | |||
| JPS4722663B1 | 1972-06-24 | |||
| JP2002038334A | 2002-02-06 |
Attorney, Agent or Firm:
Shimizu, Hatsushi (Oroshi-machi Tsuchiura-shi, Ibaraki, JP)
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