Cellular rubber article and process for producing the same

Claim 1

A PROCESS FOR THE PRODUCTION OF CELLULAR MATERIAL FROM ELASTOMERIC COPOLYMERS OF LOW UNSATURATION PREPARED BY THE COPOLYMERIZATION OF A MAJOR PROPORTION OF ISOBUTYLENE WITH A MINOR PROPORTION OF ISOPRENE AT A TEMPERATURE BELOW 0*C., BY THE APPLICATION TO THE COLD MIXTURE OF A DISSOLVED FRIEDEL-CRAFTS ACTIVE METAL HALIDE CATALYST IN SOLUTION IN AN INERT NON-COMPLEX FORMING SOLVENT, THE STEPS IN COMBINATION OF INCORPORATING INTO 100 PARTS BY WEIGHT OF POLYMER, 4 TO 10 PARTS OF SULFUR, 20 PARTS OF A PARAFFINIC HYDROCARBON OIL BOILING WITHIN THE RANGE BETWEEN 400* AND 500* F., AND ABOUT 0.5 PART OF DIAZOAMINO BENZENE, AND THEREAFTER CURING THE COMPOSITION FOR ABOUT 40 MINUTES AT 307*F., TO PRODUCE A MASS OF SMALL CLOSED CELLS WITHIN THE BODY OF THE COPOLYMER, THE INTERIOR OF EACH CELL A SUFFICIENT AMOUNT OF SULFUR BLOOMING AGENT ON THE SURFACE TO PREVENT ADHESION OF THE CELL WALLS UNDER PRESSURE, THE ELASTICATOR SERVING THE COMBINED PURPOSES OF PLASTICIZER DURING THE MILLING STEP, CURING AID AND BLOOMING AGENT AFTER COMPLETION OF THE CURING SOFTENER TO FACILITATE CELL-FORMATION DURING CURING, AND BLOOM-PROMOTER.