| abstract |
The present invention relates to a polyester polyol, (a) a dicarboxylic acid composition, (a1) 50 to 100 mol% of a terephthalic acid-based material selected from terephthalic acid, dimethyl terephthalate, polyalkylene terephthalate and mixtures thereof, (a2) from 0 to 50 mol% of phthalic acid, phthalic anhydride or isophthalic acid, (a3) 0 to 50 mol% of at least one dicarboxylic acid, , 10 to 70 mol% of a dicarboxylic acid composition, (b) from 2 to 30 mol% of at least one fatty acid, a fatty acid derivative and / or benzoic acid, (c) from 10 to 70 mol% of at least one aliphatic or cycloaliphatic diol having from 2 to 18 carbon atoms or alkoxylates thereof, (d) from 2 to 50 mol% of a highly functional polyol selected from the group consisting of glycerol, alkoxylated glycerol, trimethylol propane, alkoxylated trimethylol propane, pentaerythritol and alkoxylated pentaerythritol, , Wherein the polyol (d) having an OH functionality of ≥ 2.9 per kg of polyester polyol is reacted in an amount of not less than 200 mmol, preferably not less than 500 mmol, particularly preferably not less than 800 mmol, To provide an ester polyol. |