Sulfur vulcanizable rubber containing sodium thiosulfate...

Details Sulfur vulcanizable rubber containing sodium thiosulfate... Sulfur vulcanizable rubber containing sodium thiosulfate...

C - Chemistry, Metallurgy

08

J

C08J 3/24 (2006.01) C08K 3/30 (2006.01) C08K 5/54 (2006.01) C08K 5/548 (2006.01)

Patent

CA 2168696

A method is disclosed for processing a rubber composition comprising thermomechanically mixing at a rubber temperature in a range of 140°C to 190°C for a mixing time of 1 to 20 minutes (i) 100 parts by weight of at least one sulfur vulcanizable elastomer selected from conjugated diene homopolymers and copolymers, natural rubber and copolymers of at least one conjugated diene and aromatic vinyl compound; (ii) 10 to 250 phr of particulate precipitated silica; (iii) .01 to 1.0 parts by weight per weight of said silica of an organosilicon compound; and (iv) .05 to 10 phr of sodium thiosulfate pentahydrate. Addition of the sodium thiosulfate pentahydrate to sulfur vulcanizable rubber, silica and sulfur containing organosilicon compound decreases the mixing/processing time without sacrificing end product properties.

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