Pigments and their preparation

US4785088A · kind A · utility

Assignee

• BASF SE

Inventors

• Helmut Flohr · Ginsheim-Gustavsburg, DE
• Joachim Jesse · Bad Dürkheim, DE
• Bernhard Albert · Monsheim, DE
• Peter Neumann · Wiesloch, DE

Key dates

• Filing date: Jun 4, 1986
• Grant date: Nov 15, 1988
• Expiry date: Jun 4, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B69/06
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Pigments of the general formula EQU F.multidot.Het (I). where F is the cation of a cationic dye which has an absorption maximum at >700 nm and may or may not contain anionic groups and Het is an anion of a heteropolyacid based on tungsten, molybdenum, vanadium or a mixture of these with phosphorus, silicon, cobalt, aluminum, manganese, chromium, nickel or a mixture of these or a copper(I)-hexacyanoferrate(II) anion, are superior to the known IR dyes in terms of thermal stability and photostability, and give optical recording media having superior properties, such as a high signal/noise ratio.