Cellular polyurethane resin and process of preparing same

Claim 1

A PROCESS FOR MAKING A RESILIENT, FOAMED, POLYESTER RESINOUS MATERIAL COMPRISING MIXING TOGETHER (1) A LIQUID POLYESTER RESIN MADE SUBSTANTIALLY ENTIRELY BY THE REACTION OF AN ACID SELECTED FROM THE GROUP CONSISTING OF STRAIGHT CHAIN SATURATED ALIPHATIC DICARBOXYLIC ACIDS CONTAINING 2 TO 8 CARBON ATOMS BETWEEN THE CARBOXYL GROUPS AND STAURATED ALIPHATIC DICARBOXYLIC ACIDS CONTAINING 2 TO 8 CARBON ATOMS AND UP TO 2 NON-ADJACENT ETHER OXYGEN ATOMS BETWEEN THE CARBOXY GROUPS, A POLYETHYLENE GLYCOL AND AN ALIPHATIC POLYHYDROXY COMPOUND CONTAINING FROM 3 TO 6 HYDROXYL GROUPS, THE ACID NUMBER OF SAID RESIN BEING FROM ABOUT 1 TO 25, THE SUM OF THE ACID AND HYDROXYL NUMBERS OF SAID RESIN BEING FROM ABOUT 40 TO ABOUT 100 AND THE HYDROXYL GROUPS PROVIDED BY SAID ALIPHATIC POLYHYDROXY COMPOUND CONSTITUTING FROM ABOUT 4.6% TO ABOUT 21.9% OF THE TOTAL HYDROXYL GROUPS PROVIDED BY SAID GLYCOL AND BY SAID POLYHYDROXY COMPOUND (2) A MIXTUE OF -2,4 AND -2,6 TOLUENE DIISOCYANATES WHEREIN THE PROPORTION OF THE -2,6 ISOMER RANGES FROM ABOUT 10% TO ABOUT 40% OF SAID MIXTURE, (3) A TERTIARY AMINE CATALYST, AND (4) A SMALL AMOUNT OF WATER, SAID MIXTURE OF SAID DIISOCYANATES BEING SUBSTANTIALLY IN EXCESS OF THAT REACTIVE WITH THE CARBOXYL AND HYDROXYL GROUPS OF SAID RESIN, AND SAID WATER REACTING WITH SAID DIISOCYANATES TO PRODUCE CARBON DIOXIDE GAS FOR PRODUCTION OF A FOAM.