Preparation of impact-resistant polystyrene

US5990236A · kind A · utility

Assignee

• BASF SE

Inventors

• Konrad Knoll · Mannheim, DE
• Wolfgang Loth · Bad Dürkheim, DE
• Hermann Gausepohl · Mutterstadt, DE

Key dates

• Filing date: Jul 1, 1997
• Grant date: Nov 23, 1999
• Expiry date: Jul 1, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F287/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Abstract of the disclosure: A process is described for the continuous preparation of an impact-resistant molding material by anionic polymerization of styrene or another aromatic vinyl compound or mixtures thereof in the presence of a solvent and a block rubber, wherein the polymerization is carried out in at least 2 reaction vessels that together form a reactor cascade, the monomer stream being subdivided among the reaction vessels present, the living polymer chain ends being terminated in a conventional manner and the solvent being removed.