Process for the preparation of polyester or polyether-polyester polyol

US4582926A · kind A · utility

Assignee

• BASF SE

Inventors

• Wolfgang Straehle · Heidelberg, DE
• Matthias Marx · Fürstenfeldbruck, DE

Key dates

• Filing date: Apr 9, 1984
• Grant date: Apr 15, 1986
• Expiry date: Apr 9, 2004

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/2672
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

In order to prepare polyester or polyetherpolyester polyols, polyols, preferably di- to hexafunctional polyether polyols having hydroxyl numbers from 15 to 250 are esterified with at least one carboxylic acid anhydride, preferably phthalic acid anhydride, in the presence of N-methylimidazole, triethylenediamine, and/or triphenylphosphine as catalysts to form a carboxylic acid half-ester, and said half-ester is then oxyalkylated with at least one alkylene oxide, preferably ethylene oxide, in the presence of N-methylimidazole, triethylenediamine, triphenylphosphine, thiodialkylene glycol, employing a mixture of at least two of the compounds cited as catalysts.