Preparation of polyetherols

US6563007B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Stefan Dinsch · Schipkau, DE
• Jurgen Winkler · Schwarzheide, DE
• Gottfried Knorr · Schwarzheide, DE
• Michael Reichelt · Ruhland, DE
• Gerd Hoppner · Schwarzheide, DE
• Peter von Malotki · Cosel, DE

Key dates

• Filing date: Jul 26, 2001
• Grant date: May 13, 2003
• Expiry date: Jul 26, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S521/914
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polyetherols based on solid initiator substances and liquid, hydroxyl-containing coinitiators are prepared by a catalyzed addition reaction of alkylene oxides by a process in which the initiator combination contains diols carrying ethoxy structures, the ratio of the average number of hydroxyl groups per mole of initiator combination to the number of ethoxy structures in the polyetherol being from 1:0.2 to 1:1.8 and the ratio of the amounts by weight of the diols carrying ethoxy structures to the average molecular weight of the polyetherol being from 1:2 to 1:15. The polyetherols prepared by this process are used for the preparation of PUR, in particular, rigid PUR foams.