alkylene terephthalates poly-C¶2¶ ¶6¶-molding compositions based on

Glycerol fatty acid esters of C12-24-fatty acids which may have 1 hydroxyl group and 1 to 3 C-C-double bonds are used as an additive in poly-C2-6-alkylene terephtalate-based moulding substances. The thermoplastic moulding substance contains the following in relation to the sum of the components A and B and optionally, C to E, which make up 100 wt.% overall: a) 40 to 99.99 wt.% of at least one poly-C2-26-alkylene terephthalate-based polyester as component A; b) 0.01 to 3 wt.% glycerol fatty acid esters of C12-24-fatty acids which may have 1 hydroxyl group and 1 to 3 C-C-double bonds as component B; c) 0-49.99 wt.% blend polymers which are miscible with or dispersible in component A as component C; d) 0 to 50 wt.% fillers as component D; and e) 0 to 10 wt.% other usual additives as component E.