Patent ID: 6521691
Filing Date: 2003-02-18
Classification: B29B,B60C,C08J

Abstract:
A process of preparing a rubber composition which comprises:(A) blending a particulate elastomer-reinforcing filler and at least one additional rubber compounding ingredient with an aqueous emulsion of a conjugated diene-based elastomer and recovering a composition thereof by removing the water therefrom wherein said filler and compounding ingredient(s) are blended with said emulsion in a form of: (1) particulate (a) elastomer-reinforcing filler exclusive of aqueous or organic dispersion of said filler and (b) at least one additional rubber compounding ingredient; (2) particulate (a) elastomer-reinforcing filler as a dispersion thereof in an organic solvent and (b) at least one additional rubber compounding ingredient; and/or (3) particulate (a) elastomer-reinforcing filler as a dispersion thereof in water and (b) at least one additional rubber compounding ingredient; or (B) spraying an aqueous emulsion of a conjugated diene-based elastomer onto (1) a particulate elastomer-reinforcing filler and (2) at least one additional rubber compounding ingredient; and recovering a composition thereof by removing the water therefrom; wherein said reinforcing filler is selected from at least one of carbon black, synthetic amorphous precipitated silica aggregates and fumed silica, carbon black and modified carbon black having domains of silica on the surface thereof, and wherein said additional rubber compounding ingredient is selected from at least one of (A) additional diene-based elastomer(s) selected from homopolymers and copolymers of isoprene and/or 1,3-butadiene and copolymers of styrene with isoprene and/or 1,3-butadiene and their mixtures; (B) sulfur; (C) vulcanization accelerator(s) selected from dibenzothiazyl disulfide, 2-mercaptobenaothiazole, N-oxydiethylene benzothiazole-2-sulfenamide, 4-morpholinyl-2-benzothiazole disulfide, tetramethylthiuram disulfide, tetramethylthiuram monosulfide, tetrabutylthiuram disulfide, zinc dibutyldithiocarbamate, thiocarbqamuyl sulfenamide, N-cyclohexyl-2-benzothiazolesulfenamide, N-t-butyl-2-benzothiazole sulfenamide, and diphenylguanidine and their mixtures; and (D) vulcanization retarders selected from N-nitrosodiphenylamine, N-cyclohexyl thiophthalimide, magnesium oxide, and N-(cyclohexylthio)-phthalimide and their mixtures.