t both 0; [0025] wherein [0026] is a divalent dicarboxylic acid moiety in which R3 is an alkylene or cycloalkylene group containing from 1 to about 15 carbon atoms substituted with a total of from 1 to about 10 hydroxyl groups, with at least a portion of the hydroxyl groups being acylated with 3 to 24 carbon atom carboxylic acids; and wherein R4 is a poly(alkylene oxide) having the structure: