| 摘要 |
1528589 Fluoroacylated cellulose derivatives MIDWEST RESEARCH INSTITUTE 24 Dec 1975 [26 Dec 1974] 52817/75 Heading C3A [Also in Division B1] Fluoroacylated ethyl cellulose derivatives, containing 4À4 to 5À5 ethoxide groups per disaccharide unit whereby essentially all pendant methylol groups and more than 50 mole per cent of the ring substituted hydroxyl groups are etherified contain 0À5 to 1-6 ring-substituted -OCO(CF 2 ) m CF 3 groups per disaccharide unit, wherein m is 1-6 and the derivatives contain at most only a trace of residual hydroxyl groups as determined by infra-red spectroscopic analysis, and contain more than 10% by weight F. The derivatives preferably have the formula in 50-100 mole per cent of the repeating disaccharide units, wherein m is 2-6 and the combined fluorine is at least 12 wt.%. |
