Process for the production of rubberlike polyurethanes

Claim 1

IN A METHOD FOR MAKING A RUBBER-LIKE POLYURETHANE WHICH COMPRISES REACTING AN ORGANIC POLYISOCYANATE WITH A MEMBER SELECTED FROM THE CLASS CONSISTING OF A POLDYESTER HAVING TERMINAL HYDRROXYL GROUPS AND A MOLECULAR WEIGHT OF FROM ABOUT 500 TO ABOUT 5,000 PREPARED BY ESTERIFICATION OF A DICARBOXYLIC ACID AND A POLYHYDRIC ALCOHOL, A POLYALKYLENE ETHER GLYCOL HAVING A MOLECULAR WEIGHT WEIGHT WITHIN THE RANGE OF FROM ABOUT 500 TO ABOUT 10,000 AND A POLYDTHIOETHER GLYCOL HAVING A MOLECULAR WEIGHT WITHIN THE RANGE OF FROM ABOUT 500 TO ABOUT 10,000, SAID POLYESTER HAVING AN HYDROXYL NUMBER OF FROM ABOUT 30 TO ABOUT 120 WITH THE LOWER MOLECULAR WEIGHT CORRESPONDING SUBSTANTIALLY TO THE HIGHER HYDROXYL NUMBER, THE IMPROVEMENT WHICH COMPRISES EFFECTING THE REACTION IN THE PRESENCE OF FROM ABOUT 0,0001 PERCENT TO ABOUT 5 PERCENT OF THE REACTION PRODUCT OF TWO MOLS OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF AN AROMATIC ARTHO-HYDROXY ALDEHYDE, AN ENOLIZABLE 1,3-DIKETONE AND AN AROMATIC ORTHO-HYDROXY, AN ENOLIZABLE 1,3-DEKETONE AND LOWER ALKYLENE PRIMARY DIAMINE.