Polyurethane process using peroxides and catalysts

Claim 1

A PROCESS FOR MANUFACTURING SHAPED ELASTOMERIC ARTICLES HAVING INCREASED STABILITY TO WITHSTAND REPEATED FLEXING, COMPRISING ADMIXING IN THE LIQUID PHASE BELOW A TEMPERATURE AT WHICH REACTION WILL OCCUR AND ABOVE A TEMPERATURE AT WHICH SOLIDS WILL REMAIN PRESNT. (1) A LINEAR HYDROXYL-TERMINATED COMPOUND HAVING AN ACID NUMBER BELOW 2 AND A MOLECULAR WEIGHT RANGING FROM ABOUT 1000 TO ABOUT 4000 AND SELECTED FROM THE GROUP CONSISTING OF (A) A POLYESTER PREPARED BY THE ESTERIFICATION OF AN ALIPHATIC DICARBOXYLIC ACID WITH AN EXCESS OF AN ALKYLENE GLYCOL, (B) A POLYETHER REPRESENTED BY THE FORMULA H(OR)NOH WHEREIN R IS AN ALKYLENE GROUP CONTAINING AT LEAST TWO LINEAR CARBON ATOMS AND N IS AN INTEGER SUCH THAT THE MOLECULAR WEIGHT OF SAID POLYETHER FALLS WITHIN THE RANGE SPECIFIED, AND (C) MIXTURES OF SAID POLYESTER (A) AND SAID POLYETHER (B). (2) FROM ABOUT 0.001 TO ABOUT 0.1 PART BY WEIGHT BASED ON 100 PARTS BY WEIGHT OF SAID HYDROXYL-TERMINATED COMPOUND, OF A CATALYST FOR THE PROMOTION OF THE REACTION BETWEEN HYDROXYL GROUPS AND ISOCYANATE GROUPS, (3) FROM ABOUT 1 TO ABOUT 3 PARTS BY WEIGHT, BASED ON 100 PARTS BY WEIGHT OF SAID HYDROXYL-TERMINATED COMPOUNDS OF DICUMYL PEROXIDE, AND (4) FROM ABOUT 0.95 TO ABOUT 1.05 MOLES OF AN ORGANIC DIISOCYANATE PER MOL OF SAID HYDROXYL-TERMINATED COMPOUND SAID ORGANIC DIISOCYNATE BEING ADMIXED IMMEDIATELY PRIOR TO CASTING THE RESULTANT LIQUID MIXTURE AND THEREAFTER CASTING THE RESULTANT LIQUID MIXTURE INTO A SHAPING MEANS AND APPLYING HEAT THERETO TO CAUSE THE FORMATION OF A SHAPED, CURED POLYURETHANE ELASTOMER.