Thermoplastic polyamide moulding compositions

Claim 1

A thermoplastic molding composition consisting essentially of: A. 99.5 to 80% by weight of an amorphous linear polyamide derived from α 1 . 5 to 50 mole percent of a cycloaliphatic or aromatic aliphatic diamine. α 2 . 0 to 45 percent of an aliphatic diamine of 4 to 20 carbon atoms in which the amino groups are separated by at least four carbon atoms, β 1 . 5 to 50 mole percent of an aromatic dicarboxylic acid of 7 to 20 carbon atoms, β 2 . 0 to 45 mole percent of a saturated aliphatic dicarboxylic acid of 6 to 20 carbon atoms, the carboxy groups of which are separated by at least four carbon atoms, and γ. 0 to 80 mole percent of an aliphatic aminocarboxylic acid of 2 to 20 carbon atoms, the sum of the mole percent of α 1 and α 2 being equal to the sum of the mole percent of β 1 and β 2 , the sum of the mole percent of components α 1 , α 2 , β 1 , β 2 and γ being 100 mole percent, the sum of α 1 and β 1 being from 20 to 95 mole percent and the sum of α 2 , β 2 and γ being from 5 to 80 mole percent, said polyamide having a second order transition temperature of at least 100° C. and a reduced specific viscosity of 0.7 to 1.8 dl/g, and B. 0.5 to 20% by weight of at least one segmented thermoplastic elastomeric copolyester comprising a. long chain ester units derived from a dicarboxylic acid or its equivalent ester-forming derivatives having a molecular weight of less than about 300 and a long chain glycol or its equivalent ester-forming derivative having a molecular weight of more than about 350, and b. short chain ester units derived from a dicarboxylic acid or its equivalent ester-forming derivatives having a molecular weight of less than about 300 and a low molecular weight diol or its equivalent ester-forming derivatives having a molecular weight of less than about 250, the ester units being linked head-to-tail by ester linkages and the short chain ester units B) being present to the extent of about 25% to 65% by weight of the copolyester.