Method for producing polymer blends suited for use as filters

US7767125B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Klemens Mathauer · Ludwigshafen, DE
• Marianna Pierobon · Ludwigshafen, DE
• Tobias Petsch · Morbach, DE
• Simone Schillo · Ludwigshafen, DE
• Michael Kerber · Cleveland Heights, US
• Frank Müller · Birkenfeld, DE

Key dates

• Filing date: Mar 14, 2006
• Grant date: Aug 3, 2010
• Expiry date: May 16, 2026

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29L2031/14
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Process for production of polymer blends which are suitable as filter aids and are composed of polystyrene and of crosslinked water-insoluble polyvinylpyrrolidones via processing of the two components in an extruder, which comprises melting polystyrene in an extruder and then treating it with the polyvinylpyrrolidone, and adding, to the mixture of the components, from 0.1 to 10% by weight of water, based on the total amount of polystyrene and popcorn polymer, and extruding and comminuting the mixture.