Rubber compositions comprising at least one diene based polymer, a precipitated silica, a coupling agent package comprising a mercapto-functional alkylalkoxysilane and a blocked mercapto-functional alkylalkoxysilane, a deblocking agent, a vulcanizing package comprising at least one vulcanizing agent comprising sulfur and at least one accelerator, and a scorch modifier are provided herein.

Rubber compositions comprising at least one diene based polymer, a precipitated silica, a coupling agent package comprising a mercapto-functional alkylalkoxysilane and a blocked mercapto-functional alkylalkoxysilane, a deblocking agent, a vulcanizing package comprising at least one vulcanizing agent comprising sulfur and at least one accelerator, and a scorch modifier are provided herein.

A rubber composition for vibration damping rubbers, comprises a rubber component, a sulfur-based vulcanizing agent, a resin, and a bismaleimide. The resin is a mixed resin comprising at least an aromatic hydrocarbon resin and an aliphatic hydrocarbon resin. When the total amount of the rubber component is regarded as 100 parts by weight, the rubber composition preferably contains 1.5 parts by weight or less of the sulfur-based vulcanizing agent.

A rubber composition for vibration damping rubbers, comprises a rubber component, a sulfur-based vulcanizing agent, a resin, and a bismaleimide. The resin is a mixed resin comprising at least an aromatic hydrocarbon resin and an aliphatic hydrocarbon resin. When the total amount of the rubber component is regarded as 100 parts by weight, the rubber composition preferably contains 1.5 parts by weight or less of the sulfur-based vulcanizing agent.

The invention relates to a rubber composition which comprises an elastomer which is a copolymer of ethylene and of a 1,3-diene which comprises ethylene units which represent more than 50 mol % of the monomer units of the copolymer, the 1,3-diene being 1,3-butadiene or isoprene, 35 to 100 phr of a reinforcing filler which comprises a silica, a plasticizing system comprising a hydrocarbon plasticizing resin and a hydrocarbon liquid plasticizing agent, it being understood that the total content of hydrocarbon plasticizing resin and of hydrocarbon liquid plasticizing agent is greater than 10 phr and less than or equal to 80 phr. Such a composition confers on a tread of a tire an improved performance compromise between grip, roadholding and rolling resistance.

The invention relates to a rubber composition which comprises an elastomer which is a copolymer of ethylene and of a 1,3-diene which comprises ethylene units which represent more than 50 mol % of the monomer units of the copolymer, the 1,3-diene being 1,3-butadiene or isoprene, 35 to 100 phr of a reinforcing filler which comprises a silica, a plasticizing system comprising a hydrocarbon plasticizing resin and a hydrocarbon liquid plasticizing agent, it being understood that the total content of hydrocarbon plasticizing resin and of hydrocarbon liquid plasticizing agent is greater than 10 phr and less than or equal to 80 phr. Such a composition confers on a tread of a tire an improved performance compromise between grip, roadholding and rolling resistance.

Described are hydrosilylation-curable polyorganosiloxane compositions containing sulfur, including hydrosilylation-curable polyorganosiloxane prepolymers and hydrosilylation-cured polyorganosiloxane polymer products made therefrom, as well as methods of preparing and using the same, devices comprising or prepared from the same, and sulfur-functional organosiloxanes useful therein.

The present invention provides for a composition which is suitable for use in the vulcanization of rubber, and a process for producing the composition. The composition comprises a salt of a vulcanization accelerator which is selected from a group of accelerator classes including thiazoles, dithiocarbamates, dithiophosphates, sulfenamides, thiuram sulfides, xanthates, guanidines, aldehyde amines, or combinations thereof; a solid particulate substrate; and a hydrophobic carrier material.

The present invention provides for a composition which is suitable for use in the vulcanization of rubber, and a process for producing the composition. The composition comprises a salt of a vulcanization accelerator which is selected from a group of accelerator classes including thiazoles, dithiocarbamates, dithiophosphates, sulfenamides, thiuram sulfides, xanthates, guanidines, aldehyde amines, or combinations thereof; a solid particulate substrate; and a hydrophobic carrier material.

The invention relates to benzothiazole-containing silanes of the formula I ##STR00001##
which are prepared by reacting benzothiazole-containing silanes of the formula II ##STR00002##
with a compound of formula III
R.sup.2—H  (III). The benzothiazole-containing silanes of the formula I can be used in rubber mixtures.