Process for stabilizing oil-extended rubber

Claim 1

A PROCESS FOR PRODUCING A RUBBER COMPOSITION STABILIZED AGAINST OXIDATIVE DEGRADATION WHICH COMPRISES BLENDING TOGETHER (1) AN AQUEOUS LATEX OF VULCANIZABLE RUBBERY POLYMER OF A CONJUGATED DIENE CONTAINING UP TO 8 CARBON ATOMS CONTAMINATED WITH FROM 20 TO 1000 PARTS PER MILLION OF THE RUBBERY POLYMER OF IRON PYROPHOSPHATE WHICH LATEX CONTAINS FROM 2 TO 10% BY WEIGHT OF THE RUBBERY POLYMER OF A CARBOXYLIC ACID SALT EMULSIFIER OF THE GROUP CONSISTING OF SODIUM AND POTASSIUM SALTS OF FATTY ACIDS CONTAINING 10 TO 22 CARBON ATOMS, ABIETIC ACIDS, DEHYDRO-ABIETIC ACID, DIHYDRO- AND TETRAHYDRO-ABIETIC ACIDS, AND (2) AN AQUEOUS EMULSION OF COMPATIBLE PETROLEUM OIL SOFTENER FOR THE RUBBER, THE SAID SOFTENER HAVING A VISCOSITY BETWEEN ABOUT 10 AND 106 CS AT 210*F, SPECIFIC GRAVITY 60/60*F, OF BETWEEN ABOUT 0.9 AND 105, BOILING POINT ABOVE 300*F, AT 10 MM AND HAVING BEEN OBTAINED BY EXTRACTING PETROLEUM WITH A SOLVENT OF THE GROUP CONSISTING OF LIQUID SULFUR DIOXIDE, PHENOL, CRSEYLIC ACID, FURFURAL, BETA-BETA''-DICHLOROETHYL ETHER AND NITROBENZENE, AND SAID OIL SOFTENER BEING PRESENT IN THE BLEND IN AN AMOUNT VARYING FROM 10 TO 100 PARTS PER 100 PARTS OF RUBBERY POLYMER, AND COAGULATING THE BLEND BY MIXING WITH AN AQUEOUS SOLUTION OF AN ACID OF THE GROUP CONSISTING OF SULFURIC, HYDROCHLORIC, ACETIC, TRICHLOROACETIC AND FORMIC ACIDS AND WHICH AQUEOUS SOLUTION ALSO CONTAINS A WATER-SOLUBLE SALT OF MAGNESIUM SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM SULFATE, MAGNESIUM CHLORIDE, MAGNESIUM NITRATE, MAGNESIUM BROMIDE, MAGNESIUM IODIDE, MAGNESIUM ACETATE AND MAGNESIUM FORMATE, IN AN AMOUNT SUFFICIENT TO FURNISH 1 TO 8 MOLES OF MAGNESIUM PER MOLE OF COMTAMINATING IRON.