Covestro Deutschland Ag

Tobias Bubmann

Andreas Seidel

Jan Heijl

Marina Reithmeier

Volker Altstädt

The present invention relates to a composition for producing a thermoplastic moulding compound containing: A) an aromatic polycarbonate and/or aromatic polyester carbonate containing carboxy groups, wherein the polycarbonate has an acid value ranging from 0.5 to 10 mg of potassium hydroxide/g, determined in dichloromethane/ethanol as the solvent by means of potentiometric titration in accordance with DIN EN ISO 2114, method A in version 2002-06 with ethanolic potassium hydroxide solution at ambient temperature, and a weight-average molecular mass (M), determined by gel permeation chromatography at ambient temperature in dichloromethane as the solvent using a BPA polycarbonate standard, ranging from 15,000 to 40,000 g/mol, and B) a polymethyl methacrylate copolymer containing structural units derived from glycidyl methacrylate, wherein the copolymer has an epoxide equivalent weight, determined in dichloromethane as the solvent at ambient temperature in accordance with DIN EN 1877-1 in version 2000-12, of 0.05 to 3 wt % and a weight-average molecular mass (M), determined by gel permeation chromatography at ambient temperature in tetrahydrofuran as the solvent using a polystyrene standard, of 20,000 to 200,000 g/mol, wherein the weight ratio of component A and component B ranges from 95:5 to 35:65, and a method for producing a moulding compound from the composition, a moulding compound obtained according to the method, the use of the moulding compound to produce moulds, the moulds per se and a method for producing the moulds.

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Bayreuth, Germany

Tobias Bubmann