Patent · US Expired

Azulenemethine dyes and an optical recording medium containing the novel dyes

US5166359A · kind A · utility

0Cited by

5References

3Claims

0Family size

Assignee

BASF SE

Inventors

Michael Acker · Ludwigshafen am Rhein, DE
Peter Neumann · Wiesloch, DE
Wolfgang Schrott · Cologne, DE
Matthias Dust · Ludwigshafen, DE

Key dates

Filing date	Mar 28, 1991
Grant date	Nov 24, 1992
Priority date	—
Expiry date	Mar 28, 2011

Classification

Technology area (CPC G)Physics
CPC primaryG11B7/2534
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

An optical recording medium contains novel azulenemethine dyes of the formula ##STR1## where R is unsubstituted or substituted C.sub.1 -C.sub.6 -alkyl, X.sup..crclbar. is an anion, A.sup..sym. is heterocyclic radical, of the formula ##STR2## wherein R.sup.1, R.sup.2, R.sup.3, Y, Z and W are as defined, with the proviso that, when A.sup..sym. is a radical of the formula II f, II g, II i or II k, m is 2, A is 1, 2 or 3 and M is 1 or 2.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.