V. Howard Attorney, Agent, or FirmBurgess, Dinklage & Sprung lI-(OCII CH:). (CIIJCII:-O)C]I N-RN n-ro-CmAJfiM Cii.-cm o).hu m in which R is an alkylene radical of about 2 to 15 carbon atoms, a, b, c and d are integers from 1 to about 22 and the sum of a, b, c and d is about 5 to 25.