Polyester polyols and their use in two-component polyurethane lacquers

摘要

The present invention relates to polyester polyols which have a hydroxyl number of 80 to 250 and are the reaction product of a) 52 to 60 mole % of a polyol component containing i) 10 to 50 mole % of one or more dihydric aliphatic alcohols having at least two carbon atoms, other than neopentyl glycol, ii) 5 to 40 mole % of one or more trihydric or higher functional aliphatic alcohols having at least 3 carbon atoms, iii) 10 to 40 mole % of one or more cycloaliphatic diols and iv) 10 to 60 mole % of neopentyl glycol, with b) 40 to 48 mole % of a dicarboxylic acid component containing v) 0 to 49.9 mole % of one or more saturated aliphatic dicarboxylic acids or an anhydrides thereof having at least 2 carbon atoms and vi) 50.1 to 100 mole % of one or more unsaturated aliphatic dicarboxylic acids or anhydrides thereof having at least 4 carbon atoms, wherein the percentages of a) and b), i) to iv) and v to vi) add up to 100. The present invention also relates to two-component polyurethane coating compositions containing a polyisocyanate component and a polyhydroxyl component, wherein at least a portion of the polyol component contains the polyester polyols according to the invention and to their use for the production of coatings on plastic moldings.