White safelight handleable photographic film containing a filter dye layer
AssigneeKonica Imaging, U.S.A., Inc.
InventorsElfriede Stockel, Thomas R. Smith
Life of this patent
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Abstract
A film containing a filter layer comprised of a combination of a green dye and a yellow dye, which prevents the blue wavelength of white safelight from exposing the film. The filter layer permits handling of the film under white safelight for longer periods of time.
Claims28
A film containing a filter dye layer coated over a light-sensitive silver halide emulsion layer on the side opposite the emulsion support, comprising:
- A. a support selected from the group consisting of paper, polymer coated paper, and polymeric film;
- B. a silver halide emulsion layer coated on one side of said support in a quantity sufficient to provide a final silver deposition of between 0.5 and 5.0 grams per square meter;
- and
- C. a filter dye layer on top of said silver halide emulsion layer on the side opposite said support, said filter dye layer comprising:
- a. between about 0.0065 g/m.sup.2 and about 0.204 g/m.sup.2 of a green dye having absorbance maxima at 628-632 nm and 430 nm, with the following structure ##STR7## b. between about 0.014 g/m.sup.2 and about 0.271 g/m.sup.2 of a yellow dye with an absorbance maximum between 375 and 550 nm;
- and
- c. between about 0.430 g/m.sup.2 and about 1.399 g/m.sup.2 of a binder.
A film filter dye composition suitable for coating over a light-sensitive silver halide emulsion layer on the side opposite the emulsion support comprising a mixture of:
- a. between about 0.04 grams and about 1.2 grams of a green dye having absorbance maxima at 628-632 nm and 430 nm, with the following structure:
- ##STR9## b. between about 0.08 grams and about 1.6 grams of a yellow dye with an absorbance maximum between 375 and 550 nm;
- c. between about 2.4 grams and about 7.9 grams of a binder;
- d. between about 0.4 grams and about 5.9 grams of a 1% volume/volume solution of an anionic surfactant;
- e. between about 1.0 grams and about 7.0 grams of a 20% weight/volume solution of a hardener;
- f. water in an amount sufficient to bring the total weight of the final filter dye composition to 100 grams.
A method of preventing unwanted image formation in a photographic film or paper comprising:
- A. selecting a support from the group consisting of paper, polymer coated paper, and polymeric film;
- B. coating one side of said support with a silver halide emulsion layer in a quantity sufficient to provide a final silver deposition of between 0.5 and 5.0 grams per square meter;
- and
- C. applying a filter dye layer to said silver halide emulsion layer on the side opposite said support, said filter layer, after drying, comprising:
- a. between about 0.0065 g/m.sup.2 and about 0.204 g/m.sup.2 of a green dye having absorbance maxima at 628-632 nm and 430 nm, with the following structure:
- ##STR11## b. between about 0.014 g/m.sup.2 and about 0.271 g/m.sup.2 of a yellow dye with an absorbance maximum between 375 and 550 nm;
- and
- c. between about 0.430 g/m.sup.2 and about 1.399 g/m.sup.2 of a binder.
Dependencies are inferred from the claim text.