Preparation of cellular polyester-urethane resins

Claim 1

A PROCESS FOR THE MANUFACTUREE OF EXPANDED SYNTHETIC RUBBER-LIKE MATERIALS WHICH COMPRISES REACTING A POLYESTER HAVING AN ACID VALUE LESS THAN 15 MGS KOH PER GM. AND A HYDOXYL NUMBER FROM 46.1 TO 112.3 MGS. KOH PER GM. AND A VISCOSITY BETWEEN 50 AND 1000 POISES AT 25*C. AND FURTHER CHARACTERIZED IN THAT FROM 2 TO 18 MOLAR PERCENT, BASED ON THE TOTAL DICARBOXYLIC ACID CONTENT OF THE ESTER INGREDIENS, ARE SELECTED FROM THE GROUP CONSISTING OF AN ALIPHATIC POLYHYDOXY ALCOHOL HAVING MORE THAN 2 HYDOXYL GROUS, TRICARBALLYLIC ACID, PYROMELLITRIC ACID, DIETHANOLAMINE, AND DIHYDROXYSTEARIC ACID, SAID DICARBOXYLIC ACID CONSISTING ESSENTIALLY OF AN ALIPHATIC DICARBOXYLIC ACID HAVING FROM 2 TO 8 CARBON ATOMS IN THE CHAIN BETWEEN THE CARBOXYL GROUPS, WITH AN ORGANIC DIISOCYANATE AND WATER IN THE PRESENCE OF A CATLYST COMPRISING A MEMBER SELECTED FROM THE GROUP CONSISTING OF TRIETHYLAMINE, DIMETHYLCYCLOHEXYLAMINE, DI-(B-DIETHYLAMINOETHYL)ADIPATE, DIETHYLBENZYLAMINE, NETHYLHEXAMETHYLENEIMINE, N-ETHYLPIPERIDIEN, AND A-METHYLBENZYLDIMETHYLAMINE, WHEREIN SAID DIISOCYANATE IS PRESENT IN AN AMOUNT SUBSTANTIALLY EQUIVALENT TO THE REACTIVE END-GROUPS OF THE SAID POLYESTER AND THE WATER PRESENT, TO FORM A POLYURETHANE.