Process for producing ABS moulding compositions having a high rubber content

US6482897B1 · kind B1 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Richard Weider · Leverkusen, DE
• Gisbert Michels · Leverkusen, DE
• Frank Wingler · Leverkusen, DE

Key dates

• Filing date: Aug 6, 1997
• Grant date: Nov 19, 2002
• Expiry date: Aug 6, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F279/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for producing impact-resistant moulding compositions, which is characterised in that a monomer mixture comprising90 to 20 parts by weight of an aromatic monoalkenyl compound,10 to 50 parts by weight of an ethylenically unsaturated nitrile,0 to 30 parts by weight of other copolymerisable compoundsis polymerised by a radical mechanism in the presence of15 to 50 parts by weight, per 100 parts by weight of monomers, of a soluble, gel-free butadiene polymer, and in the presence of50 to 200 parts by weight, per 100 parts by weight of monomers, of a solvent,wherein the solvent is selected from the group comprising an aliphatic (C1-C8) or cycloaliphatic alcohol, ketone, ether, ester, nitrile (A) or mixtures thereof or a mixture of (A) with an aliphatic (C4-C10), cycloaliphatic or aromatic hydrocarbon (B) in an A:B weight ratio of 100:0 to 30:70, and the polymerisation is conducted as far as a polymer content of the total mixture of 30 to 70% by weight, with thorough mixing and optionally with the subsequent addition of a regulator and initiator, so that the isolated thermoplastic moulding composition contains 20 to 40% by weight of butadiene polymer.