Patent · US Expired

Heterocyclic polymethine dyes with carbamate or amide groups

US5221751A · kind A · utility

3Cited by

3References

3Claims

0Family size

Assignee

BASF SE

Inventors

Michael Acker · Ludwigshafen am Rhein, DE
Bernhard Albert · Monsheim, DE
Sibylle Brosius · Ludwigshafen, DE
Klaus D. Schomann · Stockach, DE
Harald Kuppelmaier · Heidelberg, DE

Key dates

Filing date	May 20, 1991
Grant date	Jun 22, 1993
Priority date	—
Expiry date	May 20, 2011

Classification

Technology area (CPC G)Physics
CPC primaryG11B7/2535
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

Polymethine dyes suitable for use in an optical recording medium have the formula ##STR1## where p is 0 or 1, PA1 Z is nitrogen, oxygen, sulfur, isopropylidene, cyclohexylidene or the radical --CH.dbd.CH--, PA1 Q is a radical of the formula ##STR2## where R.sup.2 is hydrogen, chlorine, bromine or C.sub.1 -C.sub.6 -alkyl, L is C.sub.1 -C.sub.12 -alkylene, or a single bond PA1 R.sup.1 is hydrogen, substituted or unsubstituted C.sub.1 -C.sub.20 -alkyl, substituted or unsubstituted C.sub.5 -C.sub.7 -cycloalkyl or substituted or unsubstituted phenyl, PA1 X.sup..crclbar. is an anion, and the rings A may each be substituted or benzofused.

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