发明名称 |
CELLULOSE TRIACETATE AND PROCESS FOR PRODUCING THE SAME |
摘要 |
<p>The present invention provides a cellulose triacetate exhibiting a satisfactory filtration performance. Thus, the present invention provides a cellulose triacetate whose occlusion constant (K) determined by the following method is 70 or less. Method: the cellulose triacetate is dissolved in a solvent mixture of methylene chloride/methanol (=9/1 w/w) to form a 16 % by weight (as solid concentration) solution, which is then filtered under a constant pressure at the filtration pressure of 3 kg/cm<2> and the temperature of 25 DEG C using a musulin filter to determine a filtered volume with the lapse of time, from which the slope of a linear curve represented by t/V - t (wherein t is a filtration time (sec) and V is a filtered volume (ml)) is calculated to obtain an occlusion constant (K) where K=slope x 2 x10<4>.</p> |
申请公布号 |
EP1167391(A1) |
申请公布日期 |
2002.01.02 |
申请号 |
EP19990972647 |
申请日期 |
1999.11.12 |
申请人 |
DAICEL CHEMICAL INDUSTRIES, LTD. |
发明人 |
OZAKI, TORU;OGAWA, HIROSHI;SASAI, HIROFUMI |
分类号 |
C08B3/06;C08B3/24;D01F2/28;(IPC1-7):C08B3/06 |
主分类号 |
C08B3/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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