Abstract: An electrical device in which a resistive element composed of a conductive polymer composition and two electrodes is made by a method in which the device is cut from a laminate of the conductive polymer composition and the electrodes, is exposed to a thermal treatment at a temperature above the melting temperature of the conductive polymer composition, and is then crosslinked.

Abstract: A method of purifying an aromatic carboxylic acid halide, for example p-phenoxybenzoyl chloride, comprising the steps of: (a) adding an acidic catalyst, for example a molecular sieve, to the acid halide; (b) heating the resulting mixture of the acidic catalyst and the acid halide to a temperature of about 180.degree. C. to about 250.degree. C. for a period of at least 0.5 hours; (c) distilling the mixture to obtain acid halide substantially free of aldehyde and the halo derivative thereof. Optionally, a reactive aromatic compound may be added to the mixture of the acid halide and the acidic catalyst before the heating step. The process is particularly useful for providing aromatic acid halides of sufficient purity for preparing melt stable aromatic polyketones.