US2251365A - Photographic sensitive material - Google Patents

Description

Aug. 5, 1941,` A. MILLER PHOTOGRAPHIC SENSITIVE MATERIAL Filed July 26, 1958 HIS ATTORNEYS `sensitive'material.

Patented Anas, 1941 UNirED ls'rmiss PATENT OFFICE` PHQTOGRAPHIC SENSVITIVE MATERIAL Alfred Miller, fbessau, Germany, assigner, by mesne assignments, to General Aniline & FilmV Corporation, New York, N. Y., a corporationyofv Delaware Germany July 28, 1937 Allplicatiiillli July 26, 1938, Serial No. 221,355

.'z'olsims. (c1. eas- 2) My present invention relates to photographic In photographic multi-layer material in which the single layers are sensitized for differ nt ranges of wave length there have been used a )Itihalation layers which are usual in panchromatic material. In selecting the anti-halation dyestuis one starts from the standpoint that all'the t.

layers of 'the multi-layer material are affected disadvantageously by the excess radiation, so that it appears unconditionally necessary to protect all the layers of the nlm from the injuriously scattered rays.

, It is an object ,of4 my invention to providea photographic material'having several differently sensitized layers, such as is used. for example, as a multi-layer material for color photography, wherein asuiiicient protection is provided from the excess radiation by coloring the anti-halation` layer with the color complementary to the color sensitivity of the layer adjacent to the support. If the lowest layer is sensitive to red, for example, the anti-halation layer is colored green. 'I'he anti-halation layer maybe between the support and the lowest light-sensitive layer or on the rear face of the iil'm. It is also possible to color the support itself. i

Further objects of theinvention will appear from the description following hereinafter.

It constitutes a considerable advance in the art to use, instead of an anti-halation layer, which actsas an absorbent for all the layers oi the 4multi-layer material and, therefor,'for all three fundamental regions o i the spectrum, only one suchlayer, which needs be eiective 4only for one component layer and indeed that which is adjacent to the support. Such an anti-halation layer obviously needs only one dyestuff, a yellow if the lowest layer is not especially sensitized, a red if it is ortho-chromatically or a green, if it is panchromaticallysensitized. Moreover, there is a simplication-and Ya greater certainty in the manufacture of the material, since it \is advantageous in respect of durability of the emulsion which one'has to regard in the selection of a suitable dyestuif that only a' small quantity of an individual substance comes into question and, on the other hand, it is of advantage for the binding agent in which this dyestuff is embedded that the amount to be incorporated is only very small.

The, choice of dyestui must depend on the methd of processing to which the materialis later to be subjected, -and there mayfbe used those which are solubleordestroyed and, therefore, decolorized or removed either in reducing i baths or in oxidizing baths.

As the binding agent for the anti-halation Alayer gelatin, cellulose derivatives. articiai res-u` ins, natural resins'or the like, may be used. It

is also possible to apply dyestuis without binding agents to the support, if desired .with subsequent application of a thin layer of wax. Also colored resins with or without additional 'dyestui may be used in suitable cases. y "The anti-halation layers may be used for materials in which the layers carry dye'stufi components forA color ydevelopment or dyestuffspr dy'estuff components for the silver dyestuilbleaching-out or silver-anti-diazotate processes.

Also multi-layer materials without additions necessaryjfor the production of `color may be used.

The following examples, taken with the a'ccompanying self-explanatory figures of drawing, illustrate the invention:

Example 1.-For a photographicy multi-layer material, as shown in Figure 1, of which the lowest layer issensitive to red, there isused on4 the rear face of the support an anti-halation layer which is colored with Light Green SF Yellowish (see Schultz, Farbstoiitabellen, '1th ed., vol. I,

Example` `2.--For a multi-layer material the lowest layer of which is sensitive to green there is used an anti-halation layer which is colored.v

with acid fuchsine (see Schultz, Farbstoitabellen, '7th ed., vol. I, No. 800).

Example' 3,-For a multi-layer material the lowest layer of which is sensitive to blue there is used an anti-halation layer which is colored with the dyestufl made by condensing qunaldine-dimethylsulfate with para-methoxybenzaldehyde (see German speciiication No. 579,078).

Example 4.-For a multi-layer material, as

illustrated in Figure 2, the' lowest layer of which` is sensitive to blue there may be used lbetween y diierently sensitized layers, the lowest 0i' whichV the support and the light-sensitive layer an antihalation layer which is colored with the dyestuif made from quinaldine-dmethylsulfate and diphenyl-dialdehyde. Lf

.Example 5.-For a multi-layer material having several differently sensitized layers, they lowest of which `is sensitive to green, there is used as a rear layer an 'anti-halation layer colored with fuchsone tricarboxylic acid.

Example 6.-For a multi-layermaterial having is sensitized to red, there is used an anti-halation layer which consists of polyglucoronic acidcolored with alkali blue and is coated with a colorless lacquersoluble in the developing solution.

What I claim is:

1. A photographic material comprising a single support, a layer sensitive to light of a particular spectral range and carried on one side of said support, and at least one additional layer sensitive 'to light of a different spectral range and superimposed directly on said rst mentioned light-sensitive layer, said support being provided with an anti-halation dyestuii' which absorbs only the light of the spectral range to which the :lirst mentioned light-sensitive layer adjacent said support is sensitive.

2. A photographic material comprising a single support, a silver halide gelatin emulsion layer sensitive to light of a particular spectral range and carried on one side of said support, and at 1 least one additional silver halide gelatin emulsion layer sensitive to light of a different spectral range and superimposed directly on said iirst mentioned light-sensitive layer, said support being provided with an anti-halatlon dyestufi which absorbs only the light of the spectral range to which the first mentioned light-sensitive layer adjacent said support is sensitive.

3. A photographic material comprising al single support, a silver halide gelatiny emulsion layer sensitive to light of a particular spectral lrange and carried on one side of said support, `and at least one additional silver halide gelatin emulsion layer sensitive to light of a diiferent spectral range and superimposed directly on said rst mentioned light sensitive-layer, said support having a rear lever containing an anti-halation dyestuff which absorbs only the light of the spectral range to which the rst mentioned lightsensitiveiayer adjacent said support is sensitive.

4. A photographic'material comprising a single support, a silver halide gelatin emulsion layer sensitive to light of a particular spectral range and carried on one side of said support, and at support, and at least one additional silver halide gelatin emulsion layer sensitive to light of a different spectral range andsuperimposed directly on said first mentioned light-sensitive layer, said support having a rear layer colored with Light Green SF Yellowish.

6. A photographic material comprising a single support, a silver halide gelatin emulsion layer sensitive to blue and carried on one side of said support, and at least one additional silver halide gelatin emulsion layer sensitive to light of a different spectral `range and superimposed directly y on said rst mentioned light-sensitive layer, and any intermediate layer between said support and the blue-sensitized emulsion layer, said intermediate layer being colored with a dyestuif produced by condensing quinaldine-dimethylsulfate with diphenyldialdehyde.

7. A. photographic material comprising a single support, a silver halide gelatin emulsion layer sensitive to green and carried on one side of said support, and at least one additional silver'halide gelatin emulsion layer sensitive to light of a diierent spectral range and superimposed directly on said first mentioned light-sensitive layer, said support being provided with a rear layer colored with fuchsone tricarboxylic acid.

ALFRED MILLER.

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