fluid polyester with polyester elastomers.

The thermoplastic molding composition containing A) from 10 to 98.9% by weight of at least one thermoplastic polyester, B) 0.01 to 50% by weight of a mixture of B1) at least one highly branched or hyperbranched polycarbonate with an OH of 1 to 600 mg of KOH / g of polycarbonate (to DIN 53240 under Part 2), or B2) at least one highly branched or hyperbranched of AxBy type with x at least 1.1 and y is at least polyester 2.1, or mixtures thereof, E) from 0.1 to 40% by weight of a thermoplastic polyester elastomer F) 0 to 60% by weight of other additives, the sum of the percentages by weight of components a ) to D) 100%.