Thermoplastic molding material based on graft copolymers with bimodal particle size distribution and a two-step graft shell

US5196480A · kind A · utility

Assignee

• BASF SE

Inventors

• Friedrich Seitz · Friedelsheim, DE
• Karl Ruppmich · Ludwigshafen, DE
• Juergen Vietmeier · Monsheim, DE

Key dates

• Filing date: Apr 5, 1991
• Grant date: Mar 23, 1993
• Expiry date: Apr 5, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L51/003
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Thermoplastic molding materials which have high gloss and are readily colored and comprise a first graft copolymer A of an elastomeric, crosslinked acrylate polymer as the graft base and a graft shell made from a vinyl-aromatic monomer and a polar, copolymerizable, ethylenically unsaturated monomer, and a second separately prepared graft copolymer B of an elastomeric crosslinked acrylate polymer as the graft base, which is different from that in A and has a larger mean particle diameter than the graft base of copolymer A, having a first graft shell of a vinyl-aromatic monomer and a second graft shell of a mixture of a vinyl aromatic monomer and a polar-copolymerizable, ethylenically unsaturated monomer, and a hard matrix C.