Identification of absorbent material with a thermostable colorant and process

US5032452A · kind A · utility

Assignee

• Huels Aktiengesellschaft · DE

Inventors

• Bernd Nowitzki · Marl, DE
• Annette Sandkuhler · Marl, DE
• Werner Duismann · Dorsten, DE
• Karin Muller · Marl, DE
• Peter Rennwanz · Haltern, DE

Key dates

• Filing date: Feb 20, 1990
• Grant date: Jul 16, 1991
• Expiry date: Feb 20, 2010

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/249957
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A process is provided for applying a thermostable identification mark to an absorbent material such as piece goods or ceramics. A cobalt salt solution containing hydrogen peroxide is applied in the form of a mark to the surface of an absorbent material, followed by a thermal aftertreatment above 400.degree. C. for stabilization of the identifying mark.