Naphtholactamsquaric acid dyes and optical recording materials containing these dyes

US4830951A · kind A · utility

Assignee

• BASF SE

Inventors

• Matthias Dust · Ludwigshafen, DE
• Peter Neumann · Wiesloch, DE
• Peter Hauser · Raleigh, US
• Gerhard Wagenblast · Wachenheim, DE
• Heidi Benthack-Thoms · Schifferstadt, DE
• Helmut Barzynski · Bad Dürkheim, DE
• Klaus D. Schomann · Stockach, DE
• Harald Kuppelmaier · Heidelberg, DE

Key dates

• Filing date: Sep 4, 1987
• Grant date: May 16, 1989
• Expiry date: Sep 4, 2007

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S430/146
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Naphtholactamsquaric acid dyes of the formula ##STR1## where R.sup.1 and R.sup.2 independently of one another are each unsubstituted or substituted C.sub.3 -C.sub.22 -alkyl, in which the alkyl chain may be interrupted by oxygen atoms, or are each unsubstituted or substituted C.sub.1 -C.sub.4 -aralkyl, unsubstituted or substituted C.sub.5 -C.sub.7 -cycloalkyl or unsubsituted or substituted phenyl, and the rings A, B, C and D are unsubstituted or substituted and/or benzofused, and optical recording materials consisting of a base and a layer which is sensitive to laser light and is composed of a thermoplastic or crosslinked polymer and one or more dyes (I). Because of the high light absorption of (I), the recording materials are very sensitive to light from the GaAlAs semiconductor laser. An excellent signal-to-noise ratio is obtained on reading the recordings.