Flame-resistant moulding materials based on thermoplastic aromatic polyesters and polyesters carbonates, a process for their production and their use in the production of moulded bodies

Flame resistant moulding materials containing:

• (a) from 92 to 99.98 parts by weight of thermoplastic aromatic polyester or polyester carbonate containing up to 45 mole percent of carbonate moieties based on the total of ester and carbonate moieties and said polyester or polyestercarbonate being based on diphenols, isophthalic acid or terephthalic acid, each of which is unsubstituted or substituted by halogen or alkyl having 1 to 4 carbon atoms;
• (b) from 0.01 to 3 parts by weight of at least one inorganic acid salt or organic acid salt wherein said inorganic acid salts are trisodium hexafluoroaluminate, tripotassium hexafluoroaluminate, disodium hexafluorotitanate, dipotassium hexafluorotitanate, disodium hexafluorosilicate, dipotassium hexafluorosilicate, disodium hexafluorozirconate, dipotassium hexafluorozirconate, sodium pyrophosphate, potassium pyrophosphate, sodium metaphosphate, potassium metaphosphate, sodium tetrafluoroborate, potassium tetrafluoroborate, sodium hexafluorophosphate, potassium hexafluorophosphate, sodium ortho-phosphate, potassium ortho-phosphate, or lithium ortho-phosphate, and
• said organic acid salts are alkali metal or ammonium salts of organic sulphonic acids, phosphonic acids or carboxylic acids with organic moieties being unsubstituted or substituted by halogen;
• (c) from 0.01 to 3 parts by weight of at least one halogenated phthalimide of the formula ##STR5## wherein R is hydrogen, alkyl having 1 to 10 carbon atoms, phenyl, naphthyl, C.sub.6 H.sub.4 X, C.sub.6 H.sub.3 X.sub.2 or C.sub.6 H.sub.2 X.sub.3 ;
• X is fluoro, chloro or bromo;
• R.sup.1 is a single bond, alkylene having 2 to 4 carbon atoms, phenylene or p-diphenylene;
• and
• Z is chloro or bromo;
• and
• (d) from 0 to 2.5 parts by weight of polytetrafluoroethylene.