Process for the preparation of polyricinoleic acid ester polyols having primary hydroxyl end groups

US9328196B2 · kind B2 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

• Hartmut Nefzger · Pulheim, DE
• Jörg Hofmann · Krefeld, DE
• Erika Bauer · Höchst im Odenwald, DE
• Bert Klesczewski · Neunburg vorm Wald, DE
• Klaus Lorenz · Worms, DE

Key dates

• Filing date: Nov 18, 2011
• Grant date: May 3, 2016
• Expiry date: Jul 22, 2032

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2110/0083
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the preparation of polyricinoleic acid ester polyols having primary hydroxyl end groups. It furthermore relates to polyricinoleic acid ester polyols obtainable according to the invention and polyurethane polymers prepared using these polyols. The process comprises the steps: a) polycondensation of ricinoleic acid until a hydroxyl number of >0 mg of KOH/g to <60 mg of KOH/g is reached; and b) reaction of the product obtained in step a) or of a secondary product of the product obtained in step a) comprising carboxyl groups with an epoxide of the general formula (I), wherein R1 represents hydrogen, an alkyl radical or an aryl radical, with the proviso that >80% by weight to <100% by weight, based on the total amount of the epoxide (I) employed, is ethylene oxide and the reaction is carried out in the presence of an amine as the catalyst.