Blue coloring agent for electro-photographic copying processes with positive control action

US5061585A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Hans-Tobias Macholdt · Darmstadt, DE
• Alexander Sieber · Frankfurt am Main, DE

Key dates

• Filing date: Mar 4, 1991
• Grant date: Oct 29, 1991
• Expiry date: Mar 4, 2011

Classification

• Technology area (CPC G): Physics
• CPC primary: G03G9/0912
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Blue coloring agent with positive control effect for electrophotographic copying processes, composed essentially of the compound of the formula ##STR1## the X-ray diffraction diagram of which contains a strong band at 2.degree. (CuK .alpha.)=18.47, three medium-strong bands at 2.degree. (CuK .alpha.)=5.97, 12.01 and 13.90 and weak broad bands at 2.degree. (CuK .alpha.)=20.0, 21.7, 22.5, 24.8, 28.2, 30.7 and 32.2, and the use of the coloring agent for the production of toners and developers which are used for the electrophotographic copying or duplication of originals, and also for the printing of electronically, optically or magnetically stored information or in color proofing.