Method of making polyurethane elastomer from polyester, organic diisocyanate, and bifunctional primary amine

Claim 1

A METHOD OF MAKING A RAW, STABLE POLYURETHANE GUM WHICH IS A REACTION PRODUCT OF 1 MOLE OF A POLYESTER CONTAINING ALCOHOLIC HYDROXYL END GROUPS DERIVED FROM A GYLCOL AND A DICARBOXYLIC ACID, FROM 0.06 TO 0.48 MOLE OF A PRIMARY AMIN THAT IS BIFUNCTIONAL WITH RESPECT TO ITS ABILITY TO REACT WITH ISOCYANATE GROUPS, AND FROM 0.8 TO 1.5 MOLE OF AN ORGANIC DIISOCYANATE, THE SUM OF THE ACTIVE HYDROGEN ATOMS IN THE POLYESTER AND IN THE BIFUNCTIONAL AMINE BEING APPROXIMATELY EQUAL TO THE NUMBER OF EQUIVALENTS OF ISOCYANATE, COMPRISING MIXING THE POLYESTER IN TWO DISTINCT STATES WITH THE DIISOCYANATE, THE FIRST SUCH DISTINCT STAGE COMPRISING INITIALLY MIXING FROM 45 TO 90% OF THE POLYESTER WITH ALL OF THE DIISOCYANATE WHEREBY A PREPOLYMER CONTAINING FREE ISOCYANTE GROUPS IS FORMED AND SUBSEQUENTLY, AFTER REACTION BETWEEN THE POLYESTER AND DIISOCYANATE IS SUBSTANTIALLY COMPLETE, ADDING IN A SECOND DISTINCT STAGE THE REMAINING 55 TO 10% OF THE POLYESTER AND MIXING SAID REMAINING POLYESTER INTIMATELY WITH THE PREPOLYMER, AND THEREAFTER, WHILE SAID ADDITIONAL POLYESTER IS STILL PRESENT AS SUCH IN THE PREPOLYMER, ADDING THE SAID BIFUNCTIONAL AMINE, WHEREBY THERE IS FORMED A RAW RUBBERY POLYURETHANE POLYMER OF PREDETERMINED DESIRED CHARACTERISTICS, THAT IS CURABLE TO AN ELASTIC, RUBBERY STATE BY THE ACTION OF HEAT AND ADDITIONAL ORGANIC DIISOCYANATE.

Claim 2

A METHOD OF MAKING A RAW, STABLE POLYURETHANE GUM WHICH IS A REACTION PRODUCT OF 1 MOLE OF A POLYESTER CONTAINING ALCOHOLIC HYDROXYL END GROUPS DERIVED FROM A GYLCOL AND A DICARBOXYLIC ACID, FROM 0.06 TO 0.48 MOLE OF A PRIMARY AMIN THAT IS BIFUNCTIONAL WITH RESPECT TO ITS ABILITY TO REACT WITH ISOCYANATE GROUPS, AND FROM 0.8 TO 1.5 MOLE OF AN ORGANIC DIISOCYANATE, THE SUM OF THE ACTIVE HYDROGEN ATOMS IN THE POLYESTER AND IN THE BIFUNCTIONAL AMINE BEING APPROXIMATELY EQUAL TO THE NUMBER OF EQUIVALENTS OF ISOCYANATE, COMPRISING MIXING THE POLYESTER IN TWO DISTINCT STATES WITH THE DIISOCYANATE, THE FIRST SUCH DISTINCT STAGE COMPRISING INITIALLY MIXING FROM 45 TO 90% OF THE POLYESTER WITH ALL OF THE DIISOCYANATE WHEREBY A PREPOLYMER CONTAINING FREE ISOCYANTE GROUPS IS FORMED AND SUBSEQUENTLY, AFTER REACTION BETWEEN THE POLYESTER AND DIISOCYANATE IS SUBSTANTIALLY COMPLETE, ADDING IN A SECOND DISTINCT STAGE THE REMAINING 55 TO 10% OF THE POLYESTER AND MIXING SAID REMAINING POLYESTER INTIMATELY WITH THE PREPOLYMER, AND THEREAFTER, WHILE SAID ADDITIONAL POLYESTER IS STILL PRESENT AS SUCH IN THE PREPOLYMER, ADDING THE SAID BIFUNCTIONAL AMINE, WHEREBY THERE IS FORMED A RAW RUBBERY POLYURETHANE POLYMER OF PREDETERMINED DESIRED CHARACTERISTICS, THAT IS CURABLE TO AN ELASTIC, RUBBERY STATE BY THE ACTION OF HEAT AND ADDITIONAL ORGANIC DIISOCYANATE.