Preparation of thermoplastics

US5910276A · kind A · utility

Assignee

• BASF SE

Inventors

• Norbert Güntherberg · Speyer, DE
• Jurgen Hofmann · Spalt, DE
• Hilmar Ohlig · Kaiserslautern, DE
• Elmar Mailahn · Worms, DE
• Klaus Bus · Kaiserslautern, DE
• Bernhard Czauderna · Hirschberg, DE
• Sven Grabowski · Ludwigshafen, DE

Key dates

• Filing date: Mar 22, 1996
• Grant date: Jun 8, 1999
• Expiry date: Mar 22, 2016

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C48/762
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Toughened thermoplastics are prepared by mechanically dewatering a water-moist elastomer component A containing up to 60% by weight of residual water and mixing the resulting dewatered elastomer component A' with a thermoplastic polymer B in an extruder, by a process in which the elastomer component A is fed to a twin-screw extruder which has corotating, in each case double-flight, screws and essentially includes, in the transport direction, PA1 a metering section in which the elastomer component A is fed to the extruder by a metering means, PA1 at least one squeeze section which serves for dewatering and contains at least one retarding element and in each case at least one associated dewatering orifice, PA1 at least one section provided with a conveying screw or at least one section provided with mixing, kneading or other plasticating elements or combinations of these elements, PA1 at least one section in which the thermoplastic polymer B is introduced as a melt into the extruder, PA1 at least one section provided with mixing, kneading or other plasticating elements or combinations of these elements, PA1 at least one devolatilization section which is provided with at least one dev…