Iron oxide pigments containing Al

US11634342B2 · kind B2 · utility

Assignee

• LANXESS Deutschland GmbH · DE

Inventors

• Kai BUETJE · Duisburg, DE
• Christine Kathrein · Dressendorf, DE
• Carsten Rosenhahn · Kempen, DE
• Juergen Kischkewitz · Ratingen, DE
• Ulrich Meisen · Kall, DE
• Peter Koehler · Freudenberg, DE

Key dates

• Filing date: Mar 21, 2022
• Grant date: Apr 25, 2023
• Expiry date: Mar 21, 2042

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K2201/006
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Aluminium-containing iron oxide pigments of the formula Fe2-xAlxO3 with x values from 0.01 to 0.25, characterized in that they possess an a* value of 30.5 to 32.5 CIELAB units and a b* value of 25.5 to 30.5 CIELAB units, measured in each case as full shade in the alkyd resin according to DIN EN ISO 787-25:2007.