Process for production of deep colored small particle size gas black with low content of extractable matter

US3978019A · kind A · utility

Assignee

• Deutsche Gold- und Silber-Scheideanstalt Vormals Roessler

Inventors

• Alfred Oelmann
• Claus R. Engel
• Lothar Rothbuhr · Hürth, DE

Key dates

• Filing date: Jan 28, 1975
• Grant date: Aug 31, 1976
• Expiry date: Jan 28, 1995

Classification

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

Abstract

Deeply colored carbon black having a low content of extractable matter and a primary particle size of about 8-25 nanometers is made by the gas black process using as the carrier gas for the vapors of the carbon black forming oil a hydrogen rich mixture containing over about 50 volume % hydrogen and then collecting the separated carbon black deposited on a cooling roll.