Process for the preparation of cellular and non-cellular polyurethanes

US4481309A · kind A · utility

Assignee

• BASF SE

Inventors

• Wolfgang Straehle · Heidelberg, DE
• Ingolf Buethe · Haßloch, DE
• Matthias Marx · Fürstenfeldbruck, DE

Key dates

• Filing date: Apr 9, 1984
• Grant date: Nov 6, 1984
• Expiry date: Apr 9, 2004

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/4887
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the preparation of cellular or non-cellular polyurethanes through the reaction of organic polyisocyanates with a polyether-polyester polyol component containing di- to tetrafunctional polyether-polyester polyols having hydroxyl numbers of from 10 to 200, which are themselves prepared by esterifying conventional di- to tetrafunctional polyether polyols with carboxylic acid anhydrides, preferably aromatic carboxylic acid anhydrides, in the presence of selected catalysts to form carboxylic acid half esters, and oxyalkylating the resulting carboxylic acid half esters with alkylene oxides in the presence of N-methylimidazole, triethylene diamine, triphenylphosphine or mixtures thereof with thiodialkylene glycol as catalysts.