Photographic compositions and elements spectrally sensitized with new methine dyes
AssigneeEastman Kodak Company
InventorEarl J. VanLare
Life of this patent
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Abstract
Photo-sensitive silver halide compositions and elements are spectrally sensitized with new mathine dyes having a trialkylsilylalkyl group attached to a nitrogen atom in a heterocyclic nucleus of the dye.
Claims9
In a radiation-sensitive silver-halide composition the improvement wherein said composition is spectrally sensitized by means of a methine dye comprising first and second nuclei joined by a methine linkage, at least said first nucleus comprising a heterocyclic nitrogen ring or ring system having a trialkylsilylalkyl group attached to a nitrogen atom thereof, said nitrogen atom being in conjugation with said methine linkage.
A radiation-sensitive silver-halide composition containing a spectral sensiziting amount of a methine dye represented by the structure formula ##STR29## wherein:
- D represents atoms which complete a substituted or unsubstituted heterocyclic ring or fused heterocyclic ring system constituting a first nucleus;
- Z represents atoms to complete a methine dye, including a methine linkage, a second nucleus, and if necessary, an associated ion to maintain charge neutrality;
- R.sup.1, R.sup.2 and R.sup.3 are the same or different alkyl groups having from 1 to 3 carbon atoms;
- and
- n is an integer from 1 to 6.
In a radiation-sensitive silver-halide composition, the improvement wherein said composition is spectrally sensitized by means of a methine dye selected from the group consisting of:
- (1) 5,5',6,6'-tetrachloro-1,1-diethyl-3,3'-bis(3-trimethylsilylpropyl)benzimid azolocarbocyanine iodide;
- (2) 5,6-dichloro-1,3'-diethyl-3-(3-trimethylsilylpropyl)benzimidazolooxacarboc yanine iodide;
- (3) 5,6-dichloro-1,3'-diethyl-3-(3-trimethylsilylpropyl)benzimidazolothicarboc yanine iodide;
- (4) 5,6-dichloro-1,3'-diethyl-3-(3-trimethylsilylpropyl)-4',5'-benzobenzimidaz olothiocarbocyanine iodide;
- (5) 5-{[5,6-dichloro-1-ethyl-3-)3-trimethylsilylpropyl)-2-benzimidazolinyliden e]ethylidene}-3-ethylrhodanine;
- (6) 5-{[5,6-dichloro-1-ethyl-3-(3-trimethylsilylpropyl)-2-benzimidazolinyliden e]ethylidene}-3-ethyl-2-thio-2,4-oxazolidinedione;
- (7) 3,3'-Bis(3-trimethylsilylpropyl)thiacarbocyanine iodide;
- (8) 9-methyl-3,3'-bis(3-trimethylsilylpropyl)thiacarbocyanine iodide;
- (9) 9-ethyl-3,3'-bis(3-trimethylsilylpropyl)thiacarbocyanine iodide;
- (10) 3,3'-bis(3-trimethylsilylpropyl)thiadicarbocyanine iodide;
- (11) 1'-ethyl-3-(3-trimethylsilylpropyl)thia-2'-cyanine iodide;
- (12) 3-ethyl-3'-(3-trimethylsilylpropyl)oxathiacarbocyanine iodide;
- (13) 3-ethyl-3'-(3-trimethylsilylpropyl)-4,5-benzothiacarbocyanine iodide;
- (14) 5-{[3-(3-trimethylsilylpropyl)-2-benzothiazolinylidene]ethylidene}-3-ethyl rhodanine;
- (15) 2-(3,3-dicyanoallylidene)-3-(3-trimethylsilylpropyl)benzothiazoline;
- (16) 3,3'-bis(3-trimethylsilylpropyl)selenacarbocyanine iodide;
- (17) 3,3'-bis(3-trimethylsilylpropyl)selenadicarbocyanine iodide;
- (18) 1'-ethyl-3-(3-trimethylsilylpropyl)selena-2'-cyanine iodide;
- (19) 3-ethyl-3'-(3-trimethylsilylpropyl)oxaselenocarbocyanine iodide;
- and
- (20) 5,6-dichloro-1,3-diethyl-3'-(3-trimethylsilylpropyl)benzimidazoloselenacar bocyanine iodide.
A radiation-sensitive composition comprising silver halide and a spectrally sensitizing quantity of a methine dye comprising first and second nuclei joined by a methine linkage, at least said first nucleus comprising a heterocyclic nitrogen ring or ring system having a trialkylsilylalkyl group attached to a nitrogen atom thereof, said nitrogen atom being in conjugation with said methine linkage.
Dependencies are inferred from the claim text.