Rubber-like polyurethanes and storage stable intermediates for producing the same

Claim 1

IN THE PREPARATION OF A STORABLE ADDUCT ADAPTED TO BE CURED TO FORM AN ELASTOMERIC SUBSTANTIALLY NON-POROUS POLYURETHANE BY REACTION THEREOF EITH A POLYISOCYANATE BY A PROCESS WHICH COMPRISES REACTING A POLYESTER WITH AN EXCESS OF AN ORGANIC POLYISCOYANATE AND THEN WITH A COMPOUND HAVING AMINO GROUPD, THE IMPROVEMENT WHICH PERMITS INCORPORATION OF THE POLYISOCYANATE TO BE USED DURING THE SUBSEQUENT CURING PROCESS IN THE ADDUCT AT THE TIME THE ADDUCT IS PREPARED WHICH COMPRISES (1) REACTING A POLYESTER HAVING TERMINAL HYDROXYL GROUPS, AN HYDROXYL NUMBER OF FROM ABOUT 20 TO ABOUT 80 AND AN ACID NUMBER OF ABOUT 1 WITH AN EXCESS OF AN AROMATIC DIISOCYANATE SUFFICIENT TO FORM AN ADDUCT HAVING TERMINAL-NCO GROUPS; BUT NOT MORE THAN ABOUT 0.25% BY WEIGHT -NCO GROUPS; AND POLYESTER HAVING BEEN SELECTED FROM THE CLASS CONSISTING OF POLYRSTER PEPARED BY ESTERIFICATION OF A DICARBOXYLIC ACID AND AN ALIPHATIC GLYCOL AND A POLYEATER PREPARED BY ESTERFICSTION OF A DICABOXYLIC ACID WITH A MIXTURE OF AN ALIPHATIC GLYCOL AND A HYDROGEN-CONTAINING AMINE; (2) REACTING THE SAID ADDUCT HAVING TERMINAL -NCO GROUPS WITH AN EXCESS OF AN AROMATIC DIPRIMARY AMINE TO FORM A PRODUCT CONTAINING FREE -NH2 GROUPD, AND (3) MIXING THE RESULTING PRODUCT WITH FROM ABOUT 5% TO ABOUT 15% BY WEIGHT OF A DIIOCYANATE HAVING A URETIDINEONE RING CONNECTING TWO AROMATIC RADICALS AND PREPARED BY ADDITION OF ONLY TWO MOLS OF MONOMERIC AROMATIC DIISOCYANATE.