Naphtholactam dyes and optical recording medium containing these days

US4876356A · kind A · utility

Assignee

• BASF SE

Inventors

• Matthias Dust · Ludwigshafen, DE
• Peter Neumann · Wiesloch, DE
• Ernst Schefczik
• Heidi Benthack-Thoms · Schifferstadt, DE
• Helmut Barzynski · Bad Dürkheim, DE
• Klaus D. Schomann · Stockach, DE
• Harald Kuppelmaier · Heidelberg, DE
• Eberhard Koester · Bischofswerda, DE

Key dates

• Filing date: Mar 12, 1987
• Grant date: Oct 24, 1989
• Expiry date: Mar 12, 2007

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31504
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

Naphtholactam dyes of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, n, p, Z.sup.1, Z.sup.2 and the rings A, B, C and D each have the meanings stated in the description, and an optical recording medium which contains one or more naphtholactam dyes and may contain a base.