Non-crosslinked polyether-ketones which can be processed by a thermoplastic method, and their preparation
AssigneeBASF SE
InventorHans-Josef Sterzel
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Abstract
Polyether-ketones containing the structural unit ##STR1## have a completely linear structure, and are heat-stable and free from crosslinking reactions during processing at from 390.degree. to 420.degree. C. They are prepared by Friedel-Crafts acylation of terephthaloyl chloride or terephthaloyl fluoride with diphenyl ether in hydrogen fluoride as a solvent and with boron trifluoride as a catalyst, the polycondensation reaction being carried out by a method in which the reaction mixture is a homogeneous solution.
Claims4
A polyether-ketone containing structural units of the formula ##STR3## and having an intrinsic viscosity of from 0.4 to 1.6, measured in concentrated sulfuric acid at 25.degree. C., which has a completely linear structure, and is heat-stable and free from crosslinking reactions during processing at from 390.degree. to 420.degree. C. said polyether ketone obtained by a polycondensation of terephthaloyl chloride or terephthaloyl fluoride with diphenyl ether in homogeneous phase at a reaction temperature not exceeding +10.degree. C.
Dependencies are inferred from the claim text.