Carbon blacks

US6156837A · kind A · utility

Assignee

• Cabot Corporation · US

Inventors

• John M. Branan, Jr. · Amarillo, US
• Bin Chung · Nashua, US
• Frank J. Hrach, Jr. · Parkersburg, US
• Ronald C. Hurst · Pampa, US
• David J. Kaul · Champaign, US
• Sergio A. Montes · Nashua, US
• William L. Sifleet · Acton, US
• Daniel W. Weaver · Amarillo, US
• Jay J. Zimmer · Pampa, US

Key dates

• Filing date: Aug 23, 1993
• Grant date: Dec 5, 2000
• Expiry date: Aug 23, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/19
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

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: PA1 35 mg/g.ltoreq.I.sub.2 No..ltoreq.65 mg/g PA1 30 m.sup.2 g.ltoreq.CTAB.ltoreq.55 m.sup.2 g PA1 1.12 mg/m.sup.2 .ltoreq.I.sub.2 No./CTAB ratio PA1 Tint.ltoreq.65% PA1 75 cc/100 g.ltoreq.CDBP.ltoreq.95 cc/100 g Also disclosed are rubber and/or plastic compositions containing the new carbon blacks.