Preparation of polyurethanes

Claim 1

METHOD FOR MAKING A RUBBER-LIKE POLYURETHANE WHICH COMPRISES REACTING AN ORGANIC COMPOUND CONTAINING ACTIVE HYDROGEN CONTAINING GROUPS, A MOLECULAR WEIGHT OF AT LEAST 1000, AN HYDROXYL NUMBER OF LESS THAN 112 AND SELECTED FROM THE GROUP CONSISTING OF HYDROXYL TERMINATED POLYESTERS OF POLYHYDRIC ALCOHOLS AND POLYCARBOXYLIC ACIDS AND POLYHYDRIC POLYALKYLENE ETHERS WITH AN EXCESS OF AN ORGANIC POLYISOCYANATE AND A QUANTITY OF A GLYCOL HAVING A MOLECULAR WEIGHT SUBSTANTIALLY LESS THAN 1000 AT LEAST SUFFICIENT TO REACT WITH ALL OF THE -NCO GROUPS PRESENT, SAID COMPOUNDS BEING FREE FROM ANY CARBON TO CARBON UNSATURATION OTHER THAN AROMATIC, MILLING THE RESULTING MILLABLE GUM WITH FROM ABOUT 1 TO ABOUT 10 PERCENT BY WEIGHT OF AN ORGANIC PEROXIDE AS THE SOLE CURING AGENT, PRESSING SAID GUM INTO A MOLD HAVING THE DESIRED CONFIGURATION AND CURING IT AT A TEMPERATURE OF FROM ABOUT 120*C. TO ABOUT 160*C.