Method of manufacturing cured ethylene acrylic and polyacrylate elastomers

A free flowing curative concentrate for crosslinking an ethylene/alkyl acrylate copolymer containing a monoalkyl ester of a 1,4-butene-dioic acid cure-site termonomer or a polyacrylate copolymer containing a monoalkyl ester of a 1,4-butene-dioic acid cure-site termonomer comprising an aqueous solution of hexamethylene diamine deposited on at least one particulate filler selected from the group consisting of silica fumed silica, precipitated silica and inorganic mineral wherein the aqueous solution comprises 70% hexamethylene diamine and 30% water.

A process comprising producing an aqueous solution comprising 70 weight % hexamethylene diamine and 30 weight % water;

• combining the aqueous solution with a particulate filler to deposit the hexamethylene diamine onto the filler to produce a dry liquid concentrate;
• combining the dry liquid concentrate with a copolymer to produce a mixture comprising about 0.06 to about 0.3 mole of amino function per kilogram of the copolymer;
• and heating the mixture wherein the filler is carbon black, fumed silica, precipitated silica, inorganic mineral, or combinations of two or more thereof and the copolymer is an ethylene/alkyl acrylate copolymer or a polyacrylate.