Method of making cellular rubber using amines

Claim 1

IN A METHOD OF PRODUCING A CELLULAR RUBBER WHEREIN A RUBBERY POLYMER OF POLYMERIZABLE CONJUGATED ALIPHATIC DIOLEFINE IN PLASTIC FORM IS MIXED WITHCOMPOUNDING AND CURING AGENTS AND CURED UNDER CONDITIONS PERMITTING AN INCREASE IN VOLUME, THE STEPS WHICH COMPRISE INCORPORATING IN THE PLASTIC RUBBER POLYMER AT LEAST ONE ALIPHATIC HYDROCARBON-COMPATIBLE SATURATED AMINE WHICH IS VOLATILE AT CURING TEMPERATURES FOR RUBBER AND HAS CONNECTED TO AMINONITROGEN AT LEAST ONE HYDROCARBON GROUP HAVING FIVE TO 12 INCLUSIVE CARBON ATOMS AND SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC AND CYCLOALIPHATIC SATURATED HYDROCARBON GROUPS, SAID AMINES CONSISTING OF CARBON, HYDROGEN AND NITROGEN, SUBJECTING THE RUBBERY POLYMER THUS FORMED TO AN ELEVATED TEMPERATURE TO CAUSE THE VOLATILIZATION OF SAID AMINE AND EXPANSION OF THE RUBBERY POLYMER, ALLOWING THE HEATED RUBBERY MIXTURE TO EXPAND AND FINALLY CURING THE RUBBERY POLYMER IN THE EXPANDED CONDITION, SAID AMINES BEING THE SOLE OF BLOWING AGENT IN SAID RUBBERY MIXTURE.