Thioheterocyclic near-infrared dyes
US5932740A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 1998 |
| Grant date | Aug 3, 1999 |
| Priority date | — |
| Expiry date | Jan 23, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/49854
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed is a novel near-infrared absorbing dye of formula: ##STR1## wherein X.sup.1, X.sup.2 independently represents --CR.sup.8 R.sup.9 --, --S--, --Se--, --NR.sup.10 --, --CH.dbd.CH-- or --O--; n is an integer of 2 or 3; R.sup.1 and R.sup.2 independently represent alkyl of 1 to 10 carbons or substituted alkyl of 1 to 10 carbons; R.sup.3 represents a ring chosen from a set consisting of aryl, substituted aryl, and a heterocyclic ring of a type present in photographic emulsions; R.sup.4, R.sup.5, R.sup.6 and R.sup.7 independently represent hydrogen, alkyl of 1-10 carbons, substituted alkyl of 1-10 carbons, R.sup.4 and R.sup.5 taken together or R.sup.6 and R.sup.7 taken together can represent atoms necessary to form a 5 or 6-membered aliphatic ring, an aromatic six-membered ring, an aromatic 10-membered ring, a substituted aromatic six-member ring or a substituted aromatic 10-member ring; R.sup.8, R.sup.9 independently represent alkyl of 1-10 carbons, substituted alkyl of 1-10 carbons, aryl of 6-10 carbons, or substituted aryl of 6-10 carbons; and R.sup.10 represents an alkyl of 1-10 carbons, substituted alkyl of 1-10 carbons, aryl of 6-10 carbons, or substituted aryl of 6-10 carb…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.