Back to results
US 6,441,191 B1Granted
Dyestuffs containing indolenecyanine disulphonic acid derivatives
AssigneeHoneywell International Inc.
InventorsRalph Lonsky, Lutz Uwe Lehmann
Life of this patent
Estimating the term…
Abstract
The present invention relates to the use of dye-stuffs of the general formula I in which R1, R2 and R3 and M⊕ are as defined in claim 1, as infrared-absorbing agents in hydrophilic colloidal layers, for example in recording materials or for detection purposes, recording materials, for example photographic recording materials, which comprise such dyestuffs in hydrophilic colloidal layers, and new dyestuffs of the general formula I.
Claims14
A cyanine dyestuff comprising a compound of formula I
- in which R1 and R3 independently of one another are hydrogen, (C1-C6)-alkyl which is unsubstituted or monosubstituted by halogen or phenyl, or unsubstituted or mono- or di-substituted phenyl, and R3 furthermore is also halogen or (C3-C7)-cycloalkyl, but wherein no sulpho or sulphonate groups, no carboxyl or carboxylate groups and no sulphato groups may occur as a substituent in phenyl groups, wherein the sulphonate groups are in the 5-position of the terminal indole rings, and M+ is a monovalent cation or one equivalent of a polyvalent cation, but excluding that compound of formula I in which, simultaneously, R1 and R2 are methyl, R3 is hydrogen and M+ is ½ Ni2+, that compound in which, simultaneously, R1 and R2 are ethyl, R3 is methyl and M+ is K+, and that compound in which, simultaneously, R1 and R2 are methyl, R3 is hydrogen and M⊕ is K⊕, said compound exhibiting IR absorption in the range of from about 800 to about 1000 nm.
A cyanine dyestuff of formula I
- in which R1, R2, and R3 independently of one another are hydrogen, (C1-C6)-alkyl which is unsubstituted or monosubstituted by halogen or phenyl, or unsubstituted or mono- or di-substituted phenyl, and R3 furthermore is also halogen or (C3-C7)-cycloalkyl, but wherein no sulpho or sulphonate groups, no carboxyl or carboxylate groups and no sulphato groups may occur as a substituent in phenyl groups, wherein the sulphonate groups are in the 5-position of the terminal indole rings and M+ is a sodium ion, an ammonium ion, a triethylammonium ion, or a hydrogen ion.
A cyanine dyestuff comprising a compound of formula I
- in which R1 and R3 independently of one another are hydrogen, (C1-C6)-alkyl which is unsubstituted or monosubstituted by halogen or phenyl, or unsubstituted or mono- or di-substituted phenyl, and R3 furthermore is also halogen or (C3-C7)-cycloalkyl, but wherein no sulpho or sulphonate groups, no carboxyl or carboxylate groups and no sulphato groups may occur as a substituent in phenyl groups, wherein the sulphonate groups are in the 5-position of the terminal indole rings, and M+ is a monovalent cation or one equivalent of a polyvalent cation, but excluding that compound of formula I in which, simultaneously, R1 and R2 are methyl, R3 is hydrogen and M+ is ½ Ni2+, said dyestuff compound exhibiting IR absorption in the range of from about 800 to about 1000 nm.
Dependencies are inferred from the claim text.