Patent · US Expired

Naphtholactamtrimethine dyes and optical recording medium containing same

US5002863A · kind A · utility

1Cited by

3References

6Claims

0Family size

Assignee

BASF SE

Inventors

Matthias Dust · Ludwigshafen, DE
Peter Neumann · Wiesloch, DE
Michael Acker · Ludwigshafen am Rhein, DE
Heidi Benthack-Thoms · Schifferstadt, DE
Klaus D. Schomann · Stockach, DE
Harald Kuppelmaier · Heidelberg, DE

Key dates

Filing date	Nov 17, 1988
Grant date	Mar 26, 1991
Priority date	—
Expiry date	Nov 17, 2008

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S430/146
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

Naphtholactamtrimethine dyes useful in optical recording media have the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are identical or different and each is independently of the others C.sub.1 -C.sub.22 -alkyl, which may be substituted and/or interrupted by one or more oxygen atoms, one or more imino groups or one or more C.sub.1 -C.sub.4 -alkylimino groups, or is substituted or unsubstituted C.sub.5 -C.sub.7 -cycloalkyl or substituted or unsubstituted phenyl, and the rings A, B, C and D may each be substituted and/or benzofused.

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