Patent ID: 9605106
Date: 2017-03-28
CPC Classifications: C08G

Claim:
1. A process for producing a polyester polyol with a concentration of ether groups in the range of between 9.0 mol/kg polyester polyol and 22 mol/kg polyester polyol, consisting essentially of (i) reacting in a first step in the presence of at least one catalyst selected from the group consisting of tin(II) salts, bismuth(II) salts and titanium tetraalkoxylates at a temperature in the range of between 160° C. and 240° C. and a pressure in the range of between 1 and 1013 mbar for a period in the range of between 7 and 100 hours, and (ii) reacting in a second step the reaction mixture resulting from step (i) with