JPH0417408B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Field of Application) The present invention relates to a silver halide photographic light-sensitive material, and particularly to a silver halide photographic light-sensitive material having an improved halation layer. (Prior art) Generally, silver halide photographic materials (hereinafter referred to as
A "silver halide sensitive material") has one or more light-sensitive silver halide emulsion layers on one side of a plastic film support, and if necessary, an undercoat layer, an intermediate layer, and a filter layer. , a surface protective layer, etc., and a back layer on the other side. The purpose of providing the back layer is firstly to prevent halation, secondly to prevent charging, and thirdly to prevent electrification.
This is to control the curl balance. In the present invention, a back layer provided for the purpose of preventing halation is referred to as an antihalation layer. The necessity of providing an antihalation layer on a silver halide sensitive material is well recognized in the art, and many proposals have been made to prevent halation. Usually, the adverse effects of halation can be reduced by providing a light-absorbing layer on one side of the support, thereby absorbing the light reflected onto the photosensitive layer. One example of an antihalation layer is carbon black or graphite dispersed in the antihalation layer. Colloidal carbon black dispersions useful in antihalation layers are described, for example, in U.S. Pat.
It is stated in the specification of the No. Another example of an antihalation layer is one that contains a colored material, such as a dye, that absorbs light in most of the visible spectrum. On the other hand, various alkali-soluble substances such as cellulose acetate phthalate described in US Pat. No. 2,327,828 have been preferably used as binders for such antihalation layers. When such binders are used, the antihalation layer is removed upon processing with an alkaline photographic developer. Although cellulose acetate phthalate has many desirable properties for this purpose, it is difficult to prevent halation when the surface facing the silver halide emulsion layer and the surface facing the antihalation layer come into contact with each other under high temperature and humidity. There is a tendency for the inhibiting substance to migrate to the surface layer on the side of the silver halide emulsion layer. When using an antihalation layer using cellulose acetate phthalate, such problems are likely to occur particularly in sensitive materials such as color films. The degree of transfer of the antihalation substance from the antihalation layer to the surface layer of the silver halide emulsion layer under high temperature and high humidity is quantitatively evaluated by the ratio of the adhesive area when the two are brought into contact. On the other hand, as one of the means to solve these drawbacks, a technique is known in which cellulose acetate hexahydrophthalate or cellulose acetate tetrahydrophthalate is used as a binder for the antihalation layer, as described in U.S. Pat. No. 3,392,022. It is being However, when processing cellulose acetate hexahydrophthalate or cellulose acetate tetrahydrophthalate with an alkaline photographic developer, the antihalation layer cannot be removed simply by processing, and must be forcibly wiped off. It has the disadvantage that it cannot be removed. It is a serious practical problem that the antihalation layer cannot be easily removed by development. (Objective of the Invention) Therefore, the object of the present invention is to prevent the antihalation substance from transferring even when the antihalation layer and the surface layer on the side of the silver halide emulsion layer are brought into contact with each other under high temperature and high humidity, and to prevent the antihalation substance from transferring during development processing. Another object of the present invention is to provide a silver halide sensitive material from which an antihalation layer can be easily removed. (Means for Solving the Problems) The above object of the present invention is to have at least one silver halide emulsion layer on one side of the support,
In a silver halide photographic material comprising at least one antihalation layer on the other side,
This was achieved by a silver halide photographic material characterized in that the antihalation layer contains hydroxyalkyl alkyl cellulose acetate phthalate. The content of each substituent in the hydroxyalkyl alkyl cellulose acetate phthalate used in the present invention is not particularly limited, but 2 to 70% by weight of hydroxyalkoxyl groups,
2-35% by weight of alkoxyl groups, 1-50% of acetyl groups
% by weight, preferably 10 to 70% by weight of phthalic groups, particularly 3 to 10% by weight of hydroxyalkoxyl groups, 10 to 25% by weight of alkoxyl groups, 5 to 20% by weight of acetyl groups, and 20 to 40% by weight of phthalyl groups. It is more preferable that The coating amount of hydroxyalkyl alkyl cellulose acetate phthalate in the antihalation layer of the present invention is 0.05 to 5 ml per square meter.
g, preferably 0.2 to 1 g. Furthermore, the viscosity of the hydroxyalkyl alkyl cellulose acetate phthalate used in the present invention was measured at 30°C by dissolving 50 g of the polymer in 250 ml of a mixture of acetone, methanol, and methyl cellosolve (50:25:25 volume ratio). It is preferable that the value is 50 to 1000 cps, particularly 100 to 300 cps. In the present invention, in order to provide an antihalation layer on a support, a solvent is required for the mixture of the binder and antihalation substance according to the present invention, and such a solvent can be used in a specific manner to coat the antihalation layer. Those skilled in the art can appropriately select from among the most useful solvents for film supports, such as organic solvents consisting of ketones, esters, alcohols, aromatics, and mixtures thereof. The antihalation layer according to the invention can also be applied to various types of film supports such as nitrocellulose, triacetylcellulose, acetylpropionylcellulose, polycarbonate, or polyester film bases. The antihalation substances used include carbon dispersions (colloidal carbon).
When using a dye that absorbs light in the photographic wavelength range instead of colloidal carbon, this dye can be directly mixed with the binder used in the present invention, or the binder can be coated on the support and the upper surface of the support can be coated. It is also possible to apply a dye layer to the binder layer and allow the dye to penetrate into the binder layer. The antihalation dyes that can be used in the present invention include the well-known spirit blue CR (color index No. 689), nigrosine spirit soluble (color index No. 861), and alkali blue B (color index No. 861). .704), Congo Red (Color Index No. 370), etc. The only requirement regarding the proportions of these antihalation substances is that they must be present in sufficient quantities to absorb a substantial amount of the light that passes through the film base when the photographic film is exposed. It is. The carbon used as antihalation material is preferably dispersed by hot milling, a homogenizer, or a mill of the type used for paint mixing. Further, in the antihalation layer coating solution of the present invention, it is optional to use a small amount of a coating film forming agent such as ethyl cellulose, silica, gelatin, or hydroxypropyl cellulose, or a paint dissolving aid such as acetin. When a carboxylic acid-based vinyl copolymer is used in combination, an excellent matte antihalation layer is formed. Furthermore, for the purpose of imparting slipperiness to the surface of the antihalation layer, for example, US Pat.
1143118 and the like can be used in combination with the binder of the present invention or applied as an overcoat. Similarly, for the purpose of imparting surface mattness, particles of size 0.1 to 0.1 made of silicon dioxide, polymethyl methacrylate, polyacrylonitrile, etc.
A matting agent of 10μ, especially 1 to 5μ, can also be used in combination. Various materials used on the silver halide emulsion layer side of the present invention, such as silver halide emulsion, hydrophilic binder, chemical sensitizer, hardener, color coupler, surfactant, antistatic agent, slip agent, sensitizing dye ,dye,
There are no particular restrictions on anti-fading agents, etc.; for example, Research Disclosure Vol. 176, pp. 22-32 (1978
(December 2013) can be referred to. The present invention will be further explained below with reference to Examples. Example 1 Cellulose acetate film support (thickness
A coating solution having the following composition was applied to one side of the 130 μm film to provide an antihalation layer. A silver halide emulsion layer (AgBrI emulsion, I = 2 mol%) on the other side.
Sensitive materials A to D were prepared by providing a gelatin surface protective layer (1.0 .mu.m) on top of the 3.0 .mu.m thick film.

[Table] Sensitive materials A to D are mixed with 5 parts of soda carbonate, 25 parts of Glauber's salt, and water.
The sample was immersed in an alkaline aqueous solution consisting of 100 parts for 5 seconds, then immersed in water for washing, and the detachment of the antihalation layer was observed with the naked eye. Sensitive material A: Completely removed Same B: Carbon particles remain Same C: Same as above Same D (this invention): Completely removed Subsequently, each sensitive material was left at 50°C and 80% RH for 7 days, and then the surface of the halation layer was removed. The degree of adhesion between the emulsion and the surface of the emulsion protective layer was investigated. Sensitive material A: 95% adhesion Same B: 5% Same C: 5% Same D (invention): No adhesion From the above results, the film-removability and adhesion of the anti-halation layer and the sensitive material D according to the invention are clear from the above results. It can be seen that they are superior in both sexes.

Claims (1)

[Claims] 1. In a silver halide photographic material comprising at least one silver halide emulsion layer on one side of a support and at least one antihalation layer on the other side, the antihalation layer A silver halide photographic material characterized by containing hydroxyalkylalkylcellulose acetate phthalate in a layer.