Abstract: Scorch (the premature crosslinking of an elastomer) is a problem that is often encountered in carboxylated rubbers in the presence of metal oxides which are used as crosslinking agents. Adipic acid can be used to greatly improve the scorch resistance of carboxylated rubbers. Adipic acid can be distributed throughout a carboxylated rubber before or after coagulation using any procedure that will result in a thorough mixing to form a rubber composition with improved scorch resistance.

Abstract: There is disclosed a process for the production of tack-free, pourable, filler containing elastomer powder which comprises(a) dispersing a carbon black filler in water;(b) mixing the thus dispersed carbon black filler with an elastomer latex;(c) coagulating the thus produced mixture of elastomer latex and carbon black with an acid/alum solution;(d) partitioning the thus coagulated suspension with a coating resin; and(e) filtering, washing and drying of the resultant powder, the improvement comprising using as a coating resin a mixture of a styrene/butadiene resin and a styrene/.alpha.-methylstyrene or a polystyrene resin wherein the weight ratio of the styrene/butadiene resin to the styrene/.alpha.

Abstract: Organo-sulfur impurities are removed from organic or aqueous solutions by contacting said solutions with polymers containing functional groups consisting of metal salts of N-halosulfonamides.

Abstract: There is disclosed a process for the production of tack-free, pourable, filler containing elastomer powder which comprises(a) dispersing a carbon black filler in water;(b) mixing the thus dispersed carbon black filler with an elastomer latex;(c) coagulating the thus produced mixture of elastomer latex and carbon black with a two-stage coagulation solution;(d) partitioning the thus coagulated suspension with a coating resin; and(e) filtering, washing and drying of the resultant powder, the improvement comprising using as a coating resin a mixture of a styrene/butadiene resin and a styrene/.alpha.-methylstyrene or a polystyrene resin wherein the weight ratio of the styrene/butadiene resin to the styrene/.alpha.

Abstract: Acrylonitrile is a monomer that is widely used in the synthesis of a vast variety of polymers. Undesirable quantities of unpolymerized residual acrylonitrile are often present in these acrylonitrile polymers. This residual or free acrylonitrile dissolved in an acrylonitrile polymer and/or its emulsifier system and the water phase used in its polymerization can be reduced significantly in concentration by treatment with oximes. Oximes react with acrylonitrile by an oxygen-cyanoethylation reaction which results in the formation of a cyanoethyl oximino ether linkage.