Process for producing highly concentrated pigment presscakes

US6436182B1 · kind B1 · utility

Assignee

• Clariant Corporation · DE

Inventors

• Leonhard Unverdorben · Uttenreuth, DE
• Uwe Nickel · Bad Homburg vor der Höhe, DE
• Andreas Harz · Schwalbach, DE
• Gunnar Tilch · Mainz, DE

Key dates

• Filing date: Jul 7, 2000
• Grant date: Aug 20, 2002
• Expiry date: Jul 7, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B67/0096
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to an advantageous process for producing highly concentrated pigment presscakes which comprises concentrating a pigment suspension on a high-pressure filter press with a pressure of at least 16 bar to a pigment content of at least 50% by weight without adding nonionic surfactants which have a cloud point in water.