Typical polyesterpolyols useful in the present invention include polyesterpolyols obtained by a dehydration-condensation (esterification) reaction of a single compound or a mixture of compounds selected from diols having 2 to 20 carbon atoms, for example, alkylene and polyalkylene glycols such as ethylene glycol, propylene glycol, trimethylene glycol, butylene glycol, 1,3-butanediol, tetramethylen