POLYESTER POLYOLS AND THEIR USE AS POLYOL COMPONENT IN TWO-COMPONENT POLYURETHANE LACQUERS

摘要

NEW POLYESTER POLYOLS AND THEIR USE AS POLYOL COMPONENT IN TWO-COMPONENT POLYURETHANE LACQUERS The present invention is directed to polyester polyols in the hydroxyl number range of about 80 to 250 which are based on reaction products of a) about 52 to 60 mole % of a polyol component with b) about 40 to 48 mole % of dicarboxylic acid component, characterized in that a) the polyol component is based on (i) about 2 to 30 mole % of at least one dihydric aliphatic alcohol which has at least two carbon atoms and is different from neopentyl glycol, (ii) about 5 to 40 mole % of at least one aliphatic alcohol which is at least trihydric and has at least 3 carbon atoms, (iii) about 20 to 60 mole % of bis-(hydroxymethyl)-cyclohexane and (iv) about 10 to 50 mole % of neopentyl glycol, and b) the dicarboxylic acid component is based on (v) about 50 to 99 mole % of at least one aliphatic, saturated dicarboxylic acid or an anhydride of such an acid containing at least 2 carbon atoms and (vi) about 0.5 to 50 mole % of at least one aliphatic unsaturated dicarboxylic acid or its anhydride having at least 4 carbon atoms, the percentages under a) and b) adding up to 100. The present invention is also directed to the use of these polyester polyols as a binder component for two-component polyurethane lacquers containing lacquer polyisocyanates for the production of lacquer coats on molded plastic parts.