Pigments

US4937338A · 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: Apr 20, 1989
• Grant date: Jun 26, 1990
• Expiry date: Apr 20, 2009

Classification

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

Abstract

Pigment of the general formula: EQU f.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.