Parting agent for elastomer compositions

In the process of separating sheets of unvulcanized rubber compositions and facilitating the removal of molded vulcanized rubber compositions from a mold comprising applying a thin film of a parting agent to the surfaces of sheets of unvulcanized rubber compositions or the surface of a mold or both and separating said sheets of unvulcanized rubber compositions without self-adhering or separating molded vulcanized rubber compositions from said mold, the improvement consisting of applying a thin film of from 25mg to 5.0gm per square meter utilizing, as said parting agent, a salt of a diamine having the formula ##EQU5## wherein R.sub.3 is alkylene having 2 to 4 carbon atoms and R.sub.1 and R.sub.2 are members selected from the group consisting of hydrogen, alkyl having 1 to 8 carbon atoms and one hydrogen and one alkyl having 1 to 8 carbon atoms, with an anion component having the formula

• R -- X.sup.-
• where X.sup.- is an anion selected from the group consisting of --SO.sub.3.sup.- and --OSO.sub.3.sup.- and R is selected from the group consisting of monoalkylsulfates having from 6 to 26 carbon atoms, monoalkenylsulfates having from 6 to 26 carbon atoms, monoalkadienylsulfates having from 6 to 26 carbon atoms, sulfuric acid half esters of fatty alcohol ethoxylates having 1 to 20 mols of ethylene oxide adducted to 1 mol of a fatty alcohol having 6 to 26 carbon atoms, alkylbenzensulfonates having 4 to 12 carbon atoms in the alkyl, olefinsulfonic acids having 6 to 26 carbon atoms and .alpha.-sulfo fatty acid esters with alkanols having 1 to 4 carbon atoms, where the fatty acids have from 6 to 22 carbon atoms, dissolved in an aqueous solution in a concentration of 0.1% to 10% by weight.