Composition and method for producing a transparent thermoplastic polycarbonate/polymethyl methacrylate moulding compound

US12195623B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Andreas Seidel · Dormagen, DE
• Tobias Bubmann · Bayreuth, DE
• Jan Heijl · Loferer, DE
• Marina Reithmeier · Cologne, DE
• Volker Altstädt · Hamburg, DE

Key dates

• Filing date: Jun 27, 2022
• Grant date: Jan 14, 2025
• Expiry date: Jun 27, 2042

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2205/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

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 (Mw), 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 (Mw), determined by gel permeation chromatography at ambient temperature in tetrahydrofuran as the solvent using a polystyrene st…