Multi-layer body made of polycarbonate with high weathering resistance

A process for producing a multilayer structure, wherein the process comprises the following steps:

• producing a substrate material comprising polycarbonate having a light transmission (ISO 13468-2) of less than 1.0% and a melt volume flow rate (MVR) of 7 cm3/10 min to 25 cm3/10 min comprising
• a1) 0.02% by weight to 0.2% by weight of at least one anthraquinone-based colorant of the structure (1) or (2) with
• structure (1)
• where R1 and R2 are each independently H, OH, OR5, NH2 or NHR5,
• where R5 is alkyl, cycloalkyl, phenyl or substituted and fused phenyls and
• where R3 is H, alkyl or alkoxy and
• where R4 is H, OH or p-methylphenyl-NH—;
• and with
• structure (2):
• a2) 0.01% by weight to 1.00% by weight of one or more demolding agents and optionally components a3) to a6);
• a3) at least one thermal stabilizer,
• a4) at least one processing stabilizer,
• a5) at least one UV absorber,
• a6) at least one further additive
• producing a molding in a specific framework geometry at high mold temperatures;
• coating the molding in a flow-coating process with a primer solution comprising
• a) organic binder material which enables adhesion between PC and a polysiloxane-based coating material, and
• b) at least one UV absorber,
• c) an alcohol-based solvent,
• venting the molding at room temperature for 10-60 min and curing at 100-135° C. for 5 min to 60 min.,
• coating the molding with a siloxane coating material in a flow-coating process comprising
• a) organosilicon compounds of the formula RnSiX4-n (with n from 1 to 4), where R represents aliphatic C1 to C10 radicals and aryl radicals, and X is H, aliphatic C1 to C10 radicals and aryl radicals, or partial condensates thereof,
• b) at least one finely divided inorganic compound,
• c) an alcohol-based solvent,
• d) at least one UV absorber;
• and
• venting the molding at room temperature for 10-60 min and curing at 100-140° C. for 10 min to 120 min.