Unidirectional fiber-reinforced prepreg with thermosetting hardening matrix and method for its preparation

Unidirectional fiber-reinforced prepreg with thermosetting hardening matrix, wherein the prepreg has a fiber content of greater than or equal to 50 volume percent, and the fiber is completely wetted with a thickened impregnating resin, which consists of 100 parts by weight of an unsaturated styrene-containing, carboxyl-functional branched polyester resin, characterized in that the polyester resin 0.5 to a maximum of 2.2 parts by mass of metal oxide paste of group II a and 0.5 to a maximum of 1.5 mass parts of peroxide, and in that the impregnating resin up to 1.2 parts by weight of a low molecular weight carboxylic acid to a molecular weight of 150 grams per mole as contains accelerators and controller.