Mineral-filled polycarbonate blend moulding composition having a low bpa content, and method for preparing same

A process for producing a thermoplastic molding compound comprising the steps of

• (i) producing a masterbatch by melt compounding the following components in a co-kneader:
• B) a polymer distinct from polycarbonate containing structural units derived from bisphenol A and distinct from polyester carbonate containing structural units derived from bisphenol A or a mixture consisting of polymers distinct from polycarbonate containing structural units derived from bisphenol A and distinct from polyester carbonate containing structural units derived from bisphenol A,
• wherein component B consists of
• B1) at least one thermoplastic polymer and
• optionally
• B2) at least one non-thermoplastic polymer,
• C) at least one inorganic filler selected from the group consisting of quartz compounds, talc, wollastonite, kaolin, CaCO3, titanium dioxide and titanium dioxide in combination with other inorganic pigments, Al(OH)3, AlO(OH), Mg(OH)2 and mica and combinations of the recited fillers and
• D) optionally a non-polymeric polymer additive and/or at least one non-polymeric process auxiliary, in each case distinct from component C,
• wherein the weight ratio of component B to component C is at least 0.5, and
• wherein the weight fraction of component B1 in component B is at least 50%,
• (ii) melt compounding the masterbatch obtained in step (i) with at least one polycarbonate and/or polyester carbonate in each case containing structural units derived from bisphenol A as component A and optionally further proportions of components B, C and/or D and/or the total amount of component D.