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 ##STR7## in which R.sup.1, R.sup.2 and R.sup.3 independently of one another are hydrogen, (C.sub.1 -C.sub.6)-alkyl which is unsubstituted or monosubstituted by halogen or phenyl, or unsubstituted or mono- or di-substituted phenyl, and R.sup.3 furthermore is also halogen or (C.sub.3 -C.sub.7)-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.sup..sym. is a monovalent cation or one equivalent of a polyvalent cation, but excluding those compounds of general formula I in which, simultaneously, the sulphonate groups are in the 5-positions of the two indole systems, R.sup.1 and R.sup.2 are methyl, R.sup.3 is hydrogen and M.sup..sym. is Na.sup..sym. or 1/2 Ni.sup.2 .sym., that compound in which, simultaneously, the sulphonate groups are in the 6-positions of the two indole systems, R.sup.1 and R.sup.2 are methyl, R.sup.3 is hydrogen and M.sup..sym. is K.sup..sym., and that compound of the general formula I in which, simultaneously, the sulphonate groups are in the 5-positions of the two indole systems, R.sup.1 and R.sup.2 are ethyl, R.sup.3 is methyl and M.sup..sym. is K.sup..sym..
- 2. The recording material of claim 1 wherein, in the general formula I,
- R.sup.1 and R.sup.2 are (C.sub.1 -C.sub.3)-n-alkyl;
- R.sup.3 is hydrogen or (C.sub.1 -C.sub.4)-alkyl; and
- M.sup..sym. is an alkali metal cation or the unsubstituted ammonium ion or an ammonium ion which is substituted by 1 to 4 identical or different (C.sub.1 -C.sub.4)-alkyl radicals, or the hydrogen ion.
- 3. The recording material of claim 2 wherein, in the general formula I, R.sup.1 and R.sup.2 are methyl, R.sup.3 is hydrogen and M.sup..sym. is the sodium, the potassium, the ammonium or the triethylammonium ion.
- 4. The recording material of claim 1, wherein the material is a photographic or reprographic recording material based on silver halide.
- 5. The recording material of claim 2, wherein the material is a photographic or reprographic recording material based on silver halide.
- 6. The recording material of claim 3, wherein the material is a photogrpahic or reprographic recording material based on silver halide.
- 7. The recording material as claimed in claim 1, wherein the dyestuffs of the general formula I are present in the hydrophilic colloidal layer in the form of J aggregates.
- 8. The recording material as claimed in claim 1, which contains the dyestuff of the general formula I in an amount of 5 to 500 mg/M.sup.2 in the hydrophilic colloidal layer.
Priority Claims (1)
Number |
Date |
Country |
Kind |
44 26 892.0 |
Jul 1994 |
DEX |
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Parent Case Info
This application is a continuation of application Ser. No. 08/504,107 filed on Jul. 19, 1995, now abandoned.
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5445930 |
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EPX |
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01 147 451 |
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Continuations (1)
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Number |
Date |
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Parent |
504107 |
Jul 1995 |
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