Title:
CELLULOSE TRIACETATE AND PROCESS FOR PRODUCING THE SAME
Document Type and Number:
WIPO Patent Application WO/2000/031143
Kind Code:
A1
Abstract:
Cellulose triacetate having satisfactory filterability, i.e., having a clogging constant (K) as determined by the following method of 70 or lower. (Measurement method) Cellulose triacetate is dissolved in a methylene chloride/methanol [9/1 (by weight)] mixed solvent to obtain a solution having a concentration of 16 wt.% (on a solid basis). This solution is filtered through a metal gauze filter medium at a constant filtration pressure of 3 kg/cm?2¿ and at 25 °C to measure at intervals the amount of the solution which has been filtered. From the found values, the slope of a straight line represented by t/V $m(k)t (wherein t represents the filtration time (sec) and V represents the filtered amount (ml) is calculated. The clogging constant (K) is determined using the equation K=(slope)x2x10?4¿.
Inventors:
OZAKI TORU (JP)
OGAWA HIROSHI (JP)
SASAI HIROFUMI (JP)
OGAWA HIROSHI (JP)
SASAI HIROFUMI (JP)
Application Number:
PCT/JP1999/006337
Publication Date:
June 02, 2000
Filing Date:
November 12, 1999
Export Citation:
Assignee:
DAICEL CHEM (JP)
OZAKI TORU (JP)
OGAWA HIROSHI (JP)
SASAI HIROFUMI (JP)
OZAKI TORU (JP)
OGAWA HIROSHI (JP)
SASAI HIROFUMI (JP)
International Classes:
C08B3/06; C08B3/24; D01F2/28; (IPC1-7): C08B3/06
Foreign References:
| JPH09188701A | 1997-07-22 | |||
| JPS63117001A | 1988-05-21 | |||
| JPS5614501A | 1981-02-12 |
Other References:
See also references of EP 1167391A4
Attorney, Agent or Firm:
Furuya, Kaoru (Nihonbashi-Hamacho Chuo-ku, Tokyo, JP)
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