Process for preparing polyalkenamers for packaging applications

US10570249B2 · kind B2 · utility

Assignee

• Evonik Operations GmbH · DE

Inventors

• Roland Wursche · Schneverdingen, DE
• Florian Schwager · Munster, DE
• Franz Michlbauer · Kirchweidach, DE
• Helmut Hausner · Trostberg, DE
• Claudius Neumann · Roßdorf, DE

Key dates

• Filing date: Aug 11, 2016
• Grant date: Feb 25, 2020
• Expiry date: Dec 4, 2036

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/54
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for producing cycloalkenamer-containing compositions involves converting at least one cycloalkene by ring-opening metathetic polymerization to obtain a polyalkenamer-containing product mixture. The product mixture is worked up to remove monomers and oligomers of the cycloalkenes to obtain the polyalkenamer-containing composition by extraction with CO2. The extraction involves at least two stages: an extraction with liquid CO2 under the supercritical conditions, and then an extraction with supercritical CO2. Such cycloalkenamer-containing compositions can be used, for example, in the field of packaging materials, especially for food and drink.