Polyestercarbonate resin is disclosed having a molecular structure that
contains units derived from dicarboxylic acids and units derived from at
least one diphenol selected from the group consisting of formula (IIa) and
(IIb)
##STR1##
in which R.sub.1 to R.sub.7 each independently of the others represents
hydrogen, halogen, a C.sub.1 - to C.sub.12 -alkyl radical, a C.sub.6 - to
C.sub.19 -aryl radical, a C.sub.7 - to C.sub.12 -aralkyl radical. Also
disclosed are the processes for their preparation, and their use in the
production of molded articles and extrudates.
