Organic colouring agents and coloured polymer compositions with a high stability to weathering

A transparent thermoplastic polymer composition comprising or a colouring agent combination of the structures selected from the group consisting of:

• III. (1a) and (1b), (7)
• IV. (1a) and (1b), (4), (7)
• XII. (3), (4), (8b)
• XIII. (3), (5), (8b)
• XX. (1a) and (1b), (8b)
• wherein the structures are as follows:
• wherein
• Ra and Rb, independently of one another, represent a linear or branched alkyl radical, or halogen;
• n, independently of the particular R, represents a natural number between 0 and 3, wherein for n=0 the radical is hydrogen;
• wherein
• R is selected from the group consisting of H and the p-methylphenylamine radical;
• wherein
• R3 is a halogen;
• n=4;
• wherein
• R1 and R2, independently of one another, represent a linear or branched alkyl radical, or halogen;
• n represents a natural number between 0 and 4;
• wherein
• the radicals R(5-20), independently of one another, represent hydrogen, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl, neopentyl, hexyl, thexyl, fluorine, chlorine, bromine, sulfone or CN, and
• M, represents aluminium, nickel, cobalt, iron, zinc, copper or manganese, and a polycarbonate polymer,
• wherein the colouring agent combination is used in amounts, based on the particular individual components, of from 0.000001 weight % to 1 weight %, based on the total polymer composition, and
• wherein the change in the colour value E after 1,000 h of artificial weathering with exposure to xenon light at 0.75 W is less than 1.02.