Thermoplastic molding compounds with improved impact resistance

US6835775B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Michael Breulmann · Mannheim, DE
• Sabine Oepen · Ellerstadt, DE
• Norbert Niessner · Friedelsheim, DE
• Norbert Güntherberg · Speyer, DE
• Wil Duijzings · Born, NL
• Graham Edmund Mc Kee · Neustadt, DE
• Peter Rossmanith · Baden, AT

Key dates

• Filing date: Oct 31, 2002
• Grant date: Dec 28, 2004
• Expiry date: Dec 8, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L55/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The graft copolymer made froma1: from 10 to 90% by weight of a particulate graft base A1, made from a particulate emulsion polymer with a glass transition temperature below 0° C. made froma11: from 70 to 100% by weight of butadiene or of at least one C1-8-alkyl acrylate, or of mixtures of these, as component A11,a12: from 0 to 20% by weight of at least one polyfunctional crosslinking monomer, as component A12,a13: from 0 to 30% by weight of other copolymerizable monomers, as component A13, the total amount of these being 100% by weight,a2: from 10 to 90% by weight of a graft A2 made from the following monomers, the amounts being based on A2,a21: from 60 to 100% by weight of at least one vinylaromatic monomer, or of a (meth)acrylic ester or of mixtures of these, as component A21, anda22: from 0 to 40% by weight of at least one ethylenically unsaturated monomer, as component A22,has a median particle diameter of from 130 to 500 nm and has polymodal particle size distribution in which less than 40% by weight of the particles are present in any particle size range of width 50 nm.