Claims
- 1. A recording material which contains, in at least one hydrophilic colloidal layer, an infrared absorbing agent comprising a dyestuff of the general 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 monovalent cation or one equivalent of a polyvalent cation, but excluding the compound of general formula I in which R1 and R2 are methyl, R3 is hydrogen and M+ is ½ Ni2+.
- 2. The recording material of claim 1 wherein, in the dyestuff of general formula I, R1 and R2 are methyl, R3 is hydrogen, and M is Na.
Priority Claims (1)
Number |
Date |
Country |
Kind |
44 26 892 |
Jul 1994 |
DE |
|
Parent Case Info
This application is a divisional application of U.S. application Ser. No. 08/856,890, filed May 15, 1997 now U.S. Pat. No. 5,747,233, which is a continuation of U.S. application Ser. No. 08/504,107, filed on Jul. 19, 1995, now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (5)
Number |
Date |
Country |
251282 |
Jan 1988 |
EP |
288083 |
Oct 1988 |
EP |
445627 |
Sep 1991 |
EP |
591820 |
Apr 1994 |
EP |
1-147451 |
Jun 1989 |
JP |
Non-Patent Literature Citations (3)
Entry |
Chem. Abstr. 146699z 115:732 (1991). |
Chem. Abst. 169019e 112:730 (1990). |
Chem. Abst. 108465a 112:663 (1990). |
Continuations (1)
|
Number |
Date |
Country |
Parent |
08/504107 |
Jul 1995 |
US |
Child |
08/856890 |
|
US |