Copolycarbonate compositions with improved rheological and optical properties containing diglycerolesters

A composition comprising

• A) 67.0 to 99.95 wt % of one or more copolycarbonates comprising monomer units selected from the group consisting of the structural units of general formulae (1a), (1b), (1c) and (1d)
• in which
• R1 represents hydrogen or C1-C4-alkyl,
• R2 represents C1-C4-alkyl,
• n represents 0, 1, 2 or 3 and
• R3 represents C1-C4-alkyl, aralkyl or aryl,
• Or
• 67.0 to 99.95 wt % of a blend of the one or more copolycarbonates and at least one further homo- or copolycarbonate comprising one or more monomer units of general formula (2):
• in which
• R4 represents H, linear or branched C1-C10 alkyl and
• R5 represents linear or branched C1-C10 alkyl;
• wherein the optionally present further homo- or copolycarbonate has no monomer units of formulae (1a), (1b), (1c) and (1d);
• B) 0.05 to 3.0 wt % of at least one diglycerol ester;
• and
• C) optionally one or more added substances in a total amount of up to 30.0 wt %.