| abstract |
A polycarboxylic acid alkyl or aryl ester corresponding to the formula <IMAGE> is reacted with a dialkanolamine corresponding to the formula HN-A-OH)2 at a temperature from 50 DEG to 200 DEG C. The alcohol ROH formed during this reaction is removed from the reaction mixture and the product recovered corresponds to the formula <IMAGE> in which the radicals n, X, A and R are as defined herein. The thus-produced poly-N,N-hydroxyalkylamides are particularly useful as cell-opening materials in the production of elastic polyurethane foams. |