Method of making cellular rubber using an alkyl amine and ammonium bicarbonate

Claim 1

A METHOD OF PRODUCING A CELLULAR RUBBER WHEREIN A RUBBERY POLYMER OF A POLYMERIZABLE CONJUGATED DIOLEFINIC COMPOUND HAVING LESS THAN SEVEN CARBON ATOMS, IN PLASTIC FORM, IS MIXED WITH COMPOUNDING AND CURING AGENTS AND CURED UNDER CONDITIONS PERMITTING AN INCREASE IN VOLUME, THE STEPS WHICH COMPRISE INCORPORATING IN THE PLASTIC RUBBERY POLYMER A PRODUCT FORMED BY MIXING AMMONIUM CARBONATE WITH AN AMINO HYDROGEN-CONTAINING ALKYLAMINE HAVING AT LEAST FOUR CARBON ATOMS, THEREAFTER SUBJECTING THE RUBBERY MIXTURE THUS FORMED TO ELEVATED TEMPERATURES SUFFICIENT TO CAUSE RELEASE OF GAS FROM SAID PRODUCT AND THUS EXPAND THE RUBBERY POLYMER, AND CURING THE RUBBERY POLYMER IN EXPANDED CONDITION, THE TOTAL OF THE ALKYLAMINE COMPONENTS INCORPORATED IN THE RUBBERY POLYMER BEING 2% TO 10% OF THE WEIGHT THEREOF AND AND THE AMMONIUM CARBONATE BEING PRESENT IN AN AMOUNT EQUIVALENT TO A SUBSTANTIAL PORTION OF SAID AMINE.

Claim 2

A METHOD OF PRODUCING A CELLULAR RUBBER WHEREIN A RUBBERY POLYMER OF A POLYMERIZABLE CONJUGATED DIOLEFINIC COMPOUND HAVING LESS THAN SEVEN CARBON ATOMS, IN PLASTIC FORM, IS MIXED WITH COMPOUNDING AND CURING AGENTS AND CURED UNDER CONDITIONS PERMITTING AN INCREASE IN VOLUME, THE STEPS WHICH COMPRISE INCORPORATING IN THE PLASTIC RUBBERY POLYMER A PRODUCT FORMED BY MIXING AMMONIUM CARBONATE WITH AN AMINO HYDROGEN-CONTAINING ALKYLAMINE HAVING AT LEAST FOUR CARBON ATOMS, THEREAFTER SUBJECTING THE RUBBERY MIXTURE THUS FORMED TO ELEVATED TEMPERATURES SUFFICIENT TO CAUSE RELEASE OF GAS FROM SAID PRODUCT AND THUS EXPAND THE RUBBERY POLYMER, AND CURING THE RUBBERY POLYMER IN EXPANDED CONDITION, THE TOTAL OF THE ALKYLAMINE COMPONENTS INCORPORATED IN THE RUBBERY POLYMER BEING 2% TO 10% OF THE WEIGHT THEREOF AND AND THE AMMONIUM CARBONATE BEING PRESENT IN AN AMOUNT EQUIVALENT TO A SUBSTANTIAL PORTION OF SAID AMINE.