Cabot Corporation

John M Branan, Jr

William L Sifleet

Ted W Bush

Martin C Green

Bin Chung

David J Kaul

Ronald C Hurst

Mizuo Soeda

Chiung-Huei Shieh

Myles L Mace

Roscoe W Taylor

Frank J Hrach, Jr

Jay J Zimmer

Kazue Watanabe

Daniel W Weaver

Kenneth W Babcock

Takeo Ito

Gino Panciroli

Yoichi Yuza

Chiung H Shieh

Miles Mace

Chiun Huei Shieh

Sergio A Montes

Chiuna-Huei Shieh

New carbon blacks that when incorporated into rubber compositions impart increased abrasion resistance and lower hysteresis. Also disclosed are rubber composition incorporating the novel carbon blacks, which have nitrogen surface area of at least 100, a CDBP of at least 105, a tint of 90-140 and a delta D50/Dmode ratio of 0.6-0.76.

Carbon black and rubber composition containing same

A process for producing carbon blacks comprised of mixing an oxidant, primary fuel, and carbon black feedstock to form carbon black particles and aggregates, passing the mixture through a reactor, cooling, separating, and recovering the carbon black product. The improvement comprises the addition of a secondary oxidant-containing stream to the reactor such that the secondary oxidant stream does not interfere with the formation of the carbon black particles and aggregates in the reactor. Also disclosed are new carbon black products defined by the following parameters:

Carbon blacks

Carbon blacks having a CTAB of greater than 155 m.sup.2 /g; an I.sub.2 No. of greater than 180 mg/g; a N.sub.2 SA of greater than 160 m.sup.2 /g; a Tint value of greater than 145%; a CDBP of 90-105 cc/100 g; a DBP of 115-140 cc/100 g; a .DELTA.DBP (.DELTA.DBP=DBP-CDBP) of 20-35 cc/100 g; a .DELTA.D50 of less than 40 nm; a Dmode of 40-65 nm; .DELTA.D50/Dmode ratio of 0.55-0.67; and an ASTM Aggregate Volume less than 137,000 (nm).sup.3. Also disclosed are rubber compositions containing the carbon blacks which exhibit superior handling and cornering performance properties, increased abrasion resistance and improved traction.

Performance carbon blacks

Carbon blacks imparting superior treadwear/hysteresis performance and

Carbon blacks having a having a CTAB of 95-120 m.sup.2 /g, a CDBP of 106-120 cc/100 g, a Tint/CTAB ratio of 0.90-1.10, a Skewness D.sub.c of 1.30-1.80 and a Skewness P.sub.s of 1.00-1.50. Also disclosed are rubber compounds containing the carbon blacks which exhibit increased abrasion resistance, lower heat build-up and reduced rolling resistance.

Low rolling resistance/high treadwear resistance carbon blacks

Improved treadwear/hysteresis carbon blacks having a CTAB of 120-160 m.sup.2 /g, a N.sub.2 SA of 125-180 m.sup.2 /g, a CDBP of 95-120 cc/100 g, a DBP of 110-145 cc/100 g, a Tint/CTAB ratio of 0.80-1.10, a .DELTA.D50 of 70-100 nm and a .DELTA.D50/Dmode ratio of 0.80-1.05. Also disclosed are rubber compositions containing the carbon blacks which exhibit superior treadwear/hysteresis performance properties.

Treadwear/hysteresis carbon blacks

Growing community of inventors

Amarillo, TX, United States of America

John M Branan, Jr