Phillips Petroleum Company

Gerard Kraus

Harold R Hunt

Paul J Cheng

Carl J Stacy

This invention relates to the use of organo-sulfur substituted pyridine compounds as reinforcing promoters and coupling agents for silica filled rubber compositions.

Rubber compositions comprising a siliceous filler in combination with an

Stabilization of asphalt and asphalt-rubber compositions against degradation, e.g., viscosity increase by addition of a finite small and effective viscosity stabilizing amount of an alkali metal nitrite.

Asphalt compositions

This invention relates to asphalt composition exhibiting improved physical properties comprising asphalt, hydrogenated rubber copolymer and sulfur which compositions exhibit improved temperature viscosity stability and improved tensile properties.

A carbon black with a tint residual below -6 in a rubber composition causes the hysteresis or heat buildup of such a rubber composition to be significantly lower than that of a rubber composition incorporating a carbon black with a higher tint residual, while the abrasion resistance of such rubber compositions incorporating these different blacks remains essentially unchanged. Tint residual is the difference between the measured tint and the tint calculated from the structure, nitrogen surface area, and CTAB surface area in accordance with a specific formula disclosed.

Carbon black for low-hysteresis rubber compositions

A carbon black with a tint residual below -6 in a rubber composition causes the hysteresis or heat buildup of such a rubber composition to be significantly lower than that of a rubber composition incorporating a carbon black with a higher tint residual, while the abrasion resistance of such rubber compositions incorporating these different blacks remains essentially unchanged. Tint residual is the difference between the measured tint and the tint calculated from the structure, nitrogen surface area, and CTAB surface area in accordance with a specific formula disclosed. Disclosed are carbon black reactor configurations capable of producing carbon black useful in compounding such a low-hysteresis rubber.

Carbon black is produced by heating a carbonaceous feed material to an elevated temperature to decompose the feed material to produce carbon black. A sample of the effluent from the reactor is passed as a suspension of carbon black particles in a gas into an optical cell. A beam of light is directed into the cell, and scattered light is measured at two different locations. A signal representative of the ratio of the two measured scattered light intensities is employed to control the introduction into the reactor of an alkali metal which controls the structure of the carbon black produced.

Control of carbon black production

A carbon black with a tint residual below -6 in a rubber composition causes the hysteresis or heat buildup of such a rubber composition to be significantly lower than that of a rubber composition incorporating a carbon black with a higher tint residual, while the abrasion resistance of such rubber compositions incorporating these different blacks remains essentially unchanged. Tint residual is the difference between the measured tint and the tint calculated from the structure, nitrogen surface area and CTAB surface area in accordance with a specific formula disclosed.

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Bartlesville, OK, United States of America

Gerard Kraus