Color photography element with induced spectrosensitization
OwnerJean J. Robillardinventor
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Abstract
A photographic element comprising a plurality of layers (e.g., three) of light sensitive emulsions arranged one on top of the other and based on a support, each of the emulsions comprising a coupler, a silver halide compound and a sensitization promoter which is transformed into a sensitizer by thermal, photo- or electro-sensitization. Novel processes of color photography and spectral sensitization of color photography emulsions are also disclosed. Furthermore, cameras having means to activate the sensitization promoters in the emulsions are provided.
Claims16
A color photography element comprising a support and a plurality of emulsion layers arranged one on top of the other, each of the emulsion layers comprising a silver halide, a color-forming coupler material capable of forming a color dye upon reacting with an oxidized organic amino color developer, and a sensitization promoter material which is capable of being converted into a sensitizer material for the silver halide to permit absorption of light rays in a part of the spectrum upon the application of an activation energy comprising electroenergy which is selected from the group consisting of an electric field, an ionic current and an electron current.
A color photography element comprising a support and a plurality of emulsions layers arranged one on top of the other each of the emulsion layers comprising a silver halide, a color-forming coupler material capable of forming a color dye upon reacting with an oxidized organic amino color developer, and a sensitization promoter material which is capable of being converted into a sensitizer material for the silver halide to permit absorption of light rays in a part of the spectrum upon the application of an activation energy comprising thermal energy, the promoter being selected from the group consisting of:
- benzothiazol spiropyrans having the general formula, ##STR30## wherein R.sub.7 and R.sub.8 are halogens;
- polymethine dyes having the formula ##STR31## where X.sup..crclbar. is an anion and R.sub.9 is selected from the group consisting of ##STR32## and pyrylium oxides having the formula ##STR33##
A color photography element comprising a support and a plurality of emulsion layers arranged one on top of the other, each of the emulsion layers comprising a silver halide, a color-forming coupler material capable of forming a color dye upon reacting with an oxidized organic amino color developer, and a sensitization promoter material which is capable of being converted into a sensitizer material for the silver halide to permit absorption of light rays in a part of the spectrum upon the application of an activation energy comprising light having a wavelength of from 200 to 500 nanometers, the promoter being selected from the group consisting of benzothizol spiropyrans having the formula ##STR34## wherein R.sub.11 and R.sub.12 may be the same or different and are selected from the group consisting of O-alkyl and S-alkyl, the alkyl containing 1-3 carbons;
- indoline spiropyrans having the formula ##STR35## wherein R.sub.13 is NO.sub.2, Cl or Br
- R.sub.14 is O-alkyl, Cl or Br, and
- R.sub.15 is anil having the formula ##STR36## wherein R.sub.16 is O-alkyl, the alkyl having 1-3 carbons, and R.sub.17 is alkyl having 1-3 carbons, aryl, or R.sub.17 may be combined with the benzene ring attached to the N atom to form a naphthalene group.
Dependencies are inferred from the claim text.