DETAILED DESCRIPTION We claim: 1.
A process for the production of an aromatic block polyether-poly(ester) carbonate which comprises interfacial process for producing poly(ester) carbonates using a polyphenylene oxide corresponding to the following general formula: ##STR10## wherein R independently represents hydrogen or C.
sub.
1 -C.
sub.
4 alkyl; X represents ##STR11## wherein R is as defined above, --O--, --S-- or --SO.
sub.
2 --; and m and n independently represent integers of from 1 to 200.
2.
A process as claimed in claim 1 wherein there are used (1) one or more hydroxyl group-containing polyphenylene oxides; (2) one or more other diphenols; (3) one or more chain-terminators; (4) phosgene; optionally (5) up to 80 mole %, based on the total moles of carbonate and carboxylate groups, of one or more arylene dicarboxylic acid dichlorides; and, optionally, (6) from 0.
01 to 1 mole %, based on moles of diphenols (1) and (2), of one or more branching agents; one or more polyphenylene oxides as defined in claim 1 being used as component (1) in quantities of from 5 to 95%, by weight, based on the total weight of the resulting block polyether-poly(ester) carbonate.
3.
A process as claimed in claim 2, wherein from 10 to 95%, by weight, of polyphenylene oxide (I) is used.
4.
A process as claimed in claim 3 wherein from 20 to 60%, by weight, of polyphenylene oxide (I) is used.
5.
A process as claimed in claim 2, wherein polyphenylene oxide (I) having a number average molecular weight (Mn) of from 600 to 10,000 is used.
6.
A process as claimed in claim 5 wherein polyphenylene oxide (I) having Mn as value of from 900 to 3000 is used.
7.
A process as claimed in claim 5 wherein polyphenylene oxide (I), wherein m and n independently represent integers of from 3 to 20, is used.
8.
A process as claimed in claim 2, wherein polyphenylene oxide (I), wherein R represents CH.
sub.
3, is used.
9.
A process as claimed in claim 2, wherein the catalyst required for the interfacial method is added after the phosgene and the arylene dicarboxylic acid dichloride
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Electrical and Wave 
