Glass-clear impact-modified polystyrene based on styrene-butadiene block copolymers

US6521712B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Konrad Knoll · Mannheim, DE
• Herrmann Gausepohl · Mutterstadt, DE
• Wolfgang Fischer · Meerbusch, DE
• Josef Wunsch · Schifferstadt, DE
• Paul Naegele · Schifferstadt, DE
• Jurgen Koch · Refrath, DE

Key dates

• Filing date: Dec 23, 1999
• Grant date: Feb 18, 2003
• Expiry date: Dec 23, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L53/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Block copolymers comprise at least two hard blocks S1 and S2 made from vinyl aromatic monomers and, between these, at least ore random soft block B/S made from vinyl aromatic monomers and from dienes, where the proportion of the hard blocks is above 40% by weight, based on the total block copolymer, wherein the 1,2-vinyl content in the soft block B/S is less than 20%.