Process for the production of polyester polyols with low volumes of dioxane waste

US8481606B2 · kind B2 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

• Hartmut Nefzger · Pulheim, DE
• Erika Bauer · Höchst im Odenwald, DE
• Johannes Van De Braak · Hennef (Sieg), DE
• Jürgen Schloβmacher · Bergheim, DE

Key dates

• Filing date: Oct 24, 2009
• Grant date: Jul 9, 2013
• Expiry date: Oct 24, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31605
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to the production and use of polyester polyols, formed from at least one carboxylic acid anhydride and ethylene glycol, wherein a specialized reaction control substantially suppresses the formation of 1,4-dioxane from diethylene glycol.