Thermoplastic molding compositions with improved optical properties

US8501868B2 · kind B2 · utility

Assignee

• Styrolution GmbH · DE

Inventors

• Matthias Müller · Kirchheim unter Teck, DE
• Ludger Leber · Schifferstadt, DE
• Achim Datko · Leimen, DE
• Leonie Felicitas Braun · Mannheim, DE
• Christian Lemaire · Alleur, BE
• Piyada Charoensirisomboon · Mannheim, DE
• Michel Pepers · Velden, NL

Key dates

• Filing date: Mar 25, 2011
• Grant date: Aug 6, 2013
• Expiry date: Mar 25, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2207/53
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to thermoplastic molding compositions having a mixture of (a) from 10 to 50% by weight of a methyl methacrylate polymer as component (A), from 20 to 60% by weight of a copolymer as component (B), and from 20 to 70% by weight of a graft copolymer as component (C). Component (C) is obtainable from components (c1) a core, (c2) a first graft shell, and (c3) a second graft shell. The second graft shell (c3) is obtainable via polymerization of a C1-C8-alkyl ester of methacrylic acid as component (c31) and a further vinylaromatic monomer as component (c32). Graft copolymer (C) is produced via emulsion polymerization and is isolated from the reaction mixture by precipitation resulting from shear. Also disclosed are processes for producing the molding compositions, the use of the molding compositions, and moldings obtainable from the molding compositions.