Method for producing water expandable styrene polymers

US6342540B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Guiscard Glück · Mainz, DE
• Klaus Hahn · Lampertheim, DE
• Peter Dodel · Edenkoben, DE

Key dates

• Filing date: Sep 15, 2000
• Grant date: Jan 29, 2002
• Expiry date: Sep 15, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2325/06
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A process prepares styrene polymers comprising water as sole blowing agent by mixing a polystyrene melt with water and with an emulsifying agent in an extruder, extruding the melt into a waterbath and pelletizing the cooled extrudate.