Heat-stable copolycondensate molding materials

A heat stable copolycondensate molding material which contains polyarylene sulfone and polyarylene ether sulfone units in random distribution and is obtainable by polycondensation of a mixture of

• (A) from 2 to 98 mol%, based on the sum of (A) to (C), of ##STR53## (B) from 2 to 98 mol%, based on the sum of (A) to (C), of ##STR54## and (C) from 0 to 96 mol%, based on the sum of (A) to (C), of ##STR55## where X is a chemical bond or ##STR56## wherein R.sup.3 and R.sup.4 are different when n and p are simultaneously 0, or ##STR57## only when u or p is 0, R.sup.1 and R.sup.2 are each alkyl or alkoxy, each of 1 to 6 carbon atoms, R.sup.3 and R.sup.4 are each hydrogen, alkyl of 1 to 6 carbon atoms, aryl or halogen-substituted alkyl of 1 to 4 carbon atoms, m is 0 or 1 and n and p are 0, 1, 2, 3 or 4, with
• (D) from 1 to 100 mol%, based on the sum of (D) and (E), of ##STR58## where R.sup.5 and R.sup.6 are each hydrogen or have the same meaning as R.sup.1 and R.sup.2, Y is Cl or F, and v and w are each 0, 1, 2, 3 or 4, and
• (E) from 0 to 99 mol% based on the sum of (D) and (E), of ##STR59## where Y is Cl or F, Z.sub.1 is ##STR60## Z.sub.2 is --O--, --S--, ##STR61## or a chemical bond, R.sup.7, R.sup.8, R.sup.9 and R.sup.10 are each hydrogen, Cl or F or may have the same meaning as R.sup.1 and R.sup.2, q and p are each 0 or 1 and r, s, t and u may each be an integer of from 0 to 4, with the proviso that one or more of the components (C) and (E) are present and the molar ratio of (B) to the sum of (A)+(C) is not greater than 1;
• further comprising from 5 to 50% by weight, based on the molding materials, of at least one thermoplastic selected from the group consisting of polyesters, nylons, polyurethanes, polyolefins, polyvinyl chlorides and polyoxymethylenes.