| 摘要 |
Aromatic polyetherketones containing the repeat units: -O-Ph-O-Ph-CO-Ph-I and -O-Ph-Ph-O-Ph-CO-Ph-II in the relative molar proportions I:II of 95:5 to 60:40, preferably 90:10 to 60:40. The polymer typically has a melt viscosity of at least 0.06 kN.s.m.-2 preferably at least 0.1 kN.s.m.-2. Preferred polymers are tough. The polymers may be made by condensation of hydroquinone, 4,4'-dihydroxydiphenyl and 4,4,'-difluorobenzophenone in the presence of an alkali metal carbonate or bicarbonate and of an aromatic sulphone solvent, e.g., diphenylsulphone. Polycondensation is effected at 150 DEG -400 DEG C. The polymers are very useful for wire coating. |
