Red iron-oxide pigments with improved colour values

US10563066B2 · kind B2 · utility

Assignee

• LANXESS Deutschland GmbH · DE

Inventors

• Waldemar Czaplik · Burscheid, DE
• Jurgen Kischkewitz · Ratingen, DE
• Stephan Spiegelhauer · Langenfeld, DE

Key dates

• Filing date: Sep 10, 2015
• Grant date: Feb 18, 2020
• Expiry date: May 2, 2036

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K2201/005
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to iron oxide red pigments having improved color values, a process for producing these improved iron oxide red pigments by the Penniman red process using nitrate (also referred to as nitrate process or direct red process) and an apparatus for the production thereof.