Blends of polyether copolycarbonates and high molecular weight film-forming thermoplastics

Blends of

• a) 5% by weight to 95% by weight of a segmented aliphatic-aromatic polyether copolycarbonate corresponding to general formula (I) ##STR14## in which R.sup.1 and R.sup.2 independently of one another represent H or C.sub.1-5 alkyl or form a cycloaliphatic ring containing 5 to 6 ring members,
• z=2 to 4,
• n, x, y are selected so that the total molecular weight Mw is on average in the range from 10,000 to 350,000,
• D is the deprotonated residue of a dihydric to tetrahydric C.sub.2-18 alcohol optionally containing aromatic constituents,
• n is selected so that the molecular weight Mw (as determined by the light scattering method using a scattered light photometer of the optionally branched polyether block is in the range from 4,000 to 20,000,
• Z is a diphenol residue corresponding to general formula (II) ##STR15## where R.sup.3 and R.sup.4 independently of one another represent H, C.sub.1-5 alkyl, O--C.sub.1-5 -alkyl or halogen,
• W is a single chemical bond, ##STR16## O, SO.sub.2 or SO, R.sup.5 and R.sup.6 independently of one another being hydrogen, C.sub.1-18 alkyl, phenyl, C.sub.7-19 alkaryl/aralkyl, in addition to which the substituents R.sup.5 and R.sup.6 may be closed to form a cycloalkyl group containing 4 to 18 ring members, or a group corresponding to the following formulae ##STR17## where X=O, S, SO.sub.2, ##STR18## the polyether copolycarbonate (I) having a weight average molecular weight Mw in the range from 10,000 to 350,000 (as determined by the light scattering method using a scattered light photometer) and a content of 10% by weight to 75% by weight aromatic carbonate structural units ##STR19## and b) 95% by weight to 5% by weight of an aromatic polycarbonate or a mixture of aromatic polycarbonates, the total polyether content of the blends resulting from component a) being .gtoreq.18% by weight.