POLYESTER POLYOLS AND THEIR USE FOR PREPARING MICROCELLULARPOLYURETHANE ELASTOMERS

摘要

The invention relates to a method for preparing microcellular polyurethane elastomer by reacting an organic isocyanate, a polyester polyol, a difunctional chain extender and a blowing agent, wherein at least a part of the polyester polyol used consists of a polyester polyol having a hydroxyl number between 28 and 112 and comprising units derived from aliphatic and/or aromatic dicarboxylic acids and from aliphatic, cycloaliphatic and/or heterocyclic glycols, as well as between 0.02 and 11 mole percent of units derived from monoalkanolamine with respect to the total amount of glycol and monoalkanolamine present in the polyester polyol.