PROCESS FOR PREPARING POLYARYLENE THIOETHERS HAVING HIGH STABILITY

摘要

20375-584 In a process for producing a polyarylene thioether having high stability by dehalogenation/sulfurization reaction of an alkali metal (M) sulfide such as sodium sulfide and a dihaloaromatic compound such as paradichlorobenzene in a polar organic solvent, the haloaromatic compound is used excessively in an appropriate range rather than the alkali metal sulfide and the latter stage of the reaction or all period of the reaction is conducted under a powerful stirring condition to a certain degree to obtain the polyarylene thioether wherein the concentration of -SM or -SH groups of the polymer terminal is lowered. The polyarylene thioether thus obtained suppresses the coloration in the processing with an apparatus made of ferrous material such as extruder. Furthermore, the resulting polyarylene thioether contains a very small amount of -SM or -SH groups and is useful for producing colorless and transparent articles by melt processing.