Patent ID: 8334035

Claim:
A polyester polyol having a concentration of ether groups of from 9.0 mol/kg polyester polyol to 16 mol/kg polyester polyol, which is produced by reacting a mixture comprising (A) terephthalic acid, (B) an oligoethylene glycol of the formula H—(OCH 2 CH 2 ) n —OH with a number-average number of oxyethylene groups n of from 3.0 to 9.0, and (C) at least one aliphatic dicarboxylic acid selected from the group consisting of succinic acid, glutaric acid, adipic acid, sebacic acid, suberic acid, azelaic acid, decane dicarboxylic acid, dodecane dicarboxylic acid and omega-hydroxycaproic acid.