Chrome oxide green, a process for its preparation and its use

US4957562A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Jakob Rademachers · Krefeld, DE
• Dieter Rade · Krefeld, DE
• Hans-Ulrich Hofs · Krefeld, DE
• Gunther Teichmann · Krefeld, DE
• Gerhard Trenczek · Krefeld, DE

Key dates

• Filing date: Oct 19, 1988
• Grant date: Sep 18, 1990
• Expiry date: Oct 19, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/82
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Chrome green oxide useful, inter alia, as a coloring material and having a water number of 10 to 40 g/100 g is prepared by adding sulphonic acid compounds, polyphosphoric acid compounds, polyacrylic acid compounds or mixtures thereof, in quantities of from 0.1 to 2% by weight, to an aqueous suspension of chrome oxide green pigment having a BET surface area of from 1 to 20 m.sup.2 /g before drying, and then drying the suspension.