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US 4,400,491 AGranted
Copolyester carbonates and the admixture thereof with known polycarbonates to give thermoplastic moulding compositions
AssigneeBayer Aktiengesellschaft
InventorsPeter Kafer, Leo Morbitzer, Werner Nouvertne, Dieter Neuray
Life of this patent
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Abstract
The new thermoplastic copolyester carbonates which are based on polybutylene glycols and hexahydrophthalic acid or trimethyladipic acid, as well as admixtures of copolyester carbonates of this type with known polycarbonates are suitable for thermoplastic moulding compositions, particularly where good stability to solvents, such as petrol, is required.
Claims9
A thermoplastic copolyester carbonate of formula (I) composed of structural units of the general formulae (IA) and (IB);
- ##STR4## wherein R denotes a hydrogen, chlorine or bromine atom or a C.sub.1 to C.sub.3 alkyl group,
- m is 0, 1 or 2,
- X denotes a direct bond or a C.sub.1 to C.sub.8 alkylene,
- C.sub.2 to C.sub.8 alkylidene, cyclohexylene, cyclohexylidene, --SO.sub.2 or --S radical,
- Y denotes--(CH.sub.2).sub.4,
- M denotes a radical of hexahydrophthalic acid or a radical of trimethyladipic acid, and
- u is an integer of from 10 to 50,
- said copolyester carbonate having an average weight-average molecular weight Mw of from 15,000 to 200,000, and which contains 50 to 95% by weight of aromatic polycarbonate segments and 50 to 5% by weight of polyester segments having an average number-average molecular weight Mn of from 2,000 to 20,000.
5 more elements
Dependencies are inferred from the claim text.