Making gas-expanded organic plastics

Claim 1

THE METHOD OF MAKING VULCANIZED GAS-EXPANDED RUBBER WHICH COMPRISES INCORPORATING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF HYDRAZINE, HYDRAZINE HYDRATE, HYDRAZINE SALTS OF CARBOXYLIC ACIDS, HYDRAZINE SALTS OF INORGANIC ACIDS, HYDRAZINE DITHIOCARBAZINATE, HYDRAZINE BENZENE SULFONATE, HYDRAZINE TOLUENE SULFONATE, HYDRAZINE CARBAZINATE AND HYDRAZINE SALTS OF CARBAMIC ACIDS WITH A VULCANIZABLE RUBBER MIX COMPRISING A SULFUR-VULCANIZABLE CONJUGATED DIENE POLYMER RUBBER AT A TEMPERATURE BELOW 160* F., THE AMOUNT OF SAID COMPOUND SELECTED FROM SAID GROUP BEING SUCH AS TO PROVIDE FROM 0.1 TO 5.0 PARTS OF HYDRAZINE BASE (NH2-NH2) PER 100 PARTS OF SAID RUBBER, INCORPORATING IN THE MIXTURE SULFUR IN AMOUNT SUFFICIENT TO VULCANIZE SAID RUBBER TOGETHER WITH OTHER CONVENTIONAL RUBBER COMPOUNDING INGREDIENTS TO FORM A SOLID MOLDABLE RUBBER MIXTURE, SEPARATELY INTIMATELY INCORPORATING SAID COMPOUND AND SAID SULFUR WITH THE RUBBER MIXTURE AND THEREBY AVOIDING CONTACT OF HIGH CONCENTRATIONS OF SAID COMPOUND WITH HIGH CONCENTRATIONS OF SAID SULFUR WITH CONSEQUENT PREMATURE INTERACTION, SHAPING THE RESULTING SOLID RUBBER MIXTURE CONTAINING SAID COMPOUND IN UNDECOMPOSED FORM TO FORM A BODY OF CONSIDERABLE THICKNESS, SUBSEQUENTLY HEATING THE SHAPED MIXTURE IN A MOLD AT A TEMPERATURE SUFFICIENTLY ELEVATED AND UNDER SUCH CONDITIONS AS TO EFFECT SIMULTANEOUS DECOMPOSITION OF SAID COMPOUND WITH EVOLUTION OF GAS BY SAID COMPOUND AND VULCANIZATION OF SAID RUBBER SUFFICIENTLY TO RETAIN SAID GAS AND EXPANDING SAID MIXTURE TO A CELLULAR MASS HAVING A FINE, UNIFORM PORE STRUCTURE THROUGHOUT.

Claim 2

THE METHOD OF MAKING VULCANIZED GAS-EXPANDED RUBBER WHICH COMPRISES INCORPORATING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF HYDRAZINE, HYDRAZINE HYDRATE, HYDRAZINE SALTS OF CARBOXYLIC ACIDS, HYDRAZINE SALTS OF INORGANIC ACIDS, HYDRAZINE DITHIOCARBAZINATE, HYDRAZINE BENZENE SULFONATE, HYDRAZINE TOLUENE SULFONATE, HYDRAZINE CARBAZINATE AND HYDRAZINE SALTS OF CARBAMIC ACIDS WITH A VULCANIZABLE RUBBER MIX COMPRISING A SULFUR-VULCANIZABLE CONJUGATED DIENE POLYMER RUBBER AT A TEMPERATURE BELOW 160* F., THE AMOUNT OF SAID COMPOUND SELECTED FROM SAID GROUP BEING SUCH AS TO PROVIDE FROM 0.1 TO 5.0 PARTS OF HYDRAZINE BASE (NH2-NH2) PER 100 PARTS OF SAID RUBBER, INCORPORATING IN THE MIXTURE SULFUR IN AMOUNT SUFFICIENT TO VULCANIZE SAID RUBBER TOGETHER WITH OTHER CONVENTIONAL RUBBER COMPOUNDING INGREDIENTS TO FORM A SOLID MOLDABLE RUBBER MIXTURE, SEPARATELY INTIMATELY INCORPORATING SAID COMPOUND AND SAID SULFUR WITH THE RUBBER MIXTURE AND THEREBY AVOIDING CONTACT OF HIGH CONCENTRATIONS OF SAID COMPOUND WITH HIGH CONCENTRATIONS OF SAID SULFUR WITH CONSEQUENT PREMATURE INTERACTION, SHAPING THE RESULTING SOLID RUBBER MIXTURE CONTAINING SAID COMPOUND IN UNDECOMPOSED FORM TO FORM A BODY OF CONSIDERABLE THICKNESS, SUBSEQUENTLY HEATING THE SHAPED MIXTURE IN A MOLD AT A TEMPERATURE SUFFICIENTLY ELEVATED AND UNDER SUCH CONDITIONS AS TO EFFECT SIMULTANEOUS DECOMPOSITION OF SAID COMPOUND WITH EVOLUTION OF GAS BY SAID COMPOUND AND VULCANIZATION OF SAID RUBBER SUFFICIENTLY TO RETAIN SAID GAS AND EXPANDING SAID MIXTURE TO A CELLULAR MASS HAVING A FINE, UNIFORM PORE STRUCTURE THROUGHOUT.