60 u00d7 40 u00d7 4 mm are stored in an air circulating oven for 1000 hours at 135 u00b0 c the yi is then determined according to astm e313 the difference relative to the zero sample before storage is calculated u03b4yi 1000 h the determination of the melt volume flow rate mvr is effected at 300 u00b0 c and 1 2 kg load using a melt index tester according to iso 1133 the compounds according to the invention were prepared on an ev32ht extruder from clextral with a throughput of 50 kg h the melt temperature was 320 u00b0 c the various additives were metered in the form of a powder mixture with polycarbonate powder pc 2 see under raw materials used u2212 5 by weight based on the total weight taken irgafos b900 mixture of four parts of irgafos 168 and one part of irganox 1076 pc 1 mpc is a polycarbonate without additives based on bisphenol a and dpc having a melt volume flow rate mvr of 11 4 cm 3 10 min 300 u00b0 c 1 2 kg polyfunctional compounds a1 370 ppm b1 35 ppm c1 11 ppm d1 67 ppm the content of phenolic oh terminal groups is 330 mg kg pc 2 ipc is a polycarbonate without additives based on bisphenol a having an mvr of 19 cm 3 10 min 300 u00b0 c 1 2 kg in powder form it serves for the preparation of homogeneous powder concentrates of the solid and liquid additives in polycarbonate polyfunctional compounds a b.