JPS6194044A - Silver halide photographic sensitive material - Google Patents

Abstract

PURPOSE:To easily remove an antihalation layer at the time of a development by forming silver halide emulsion layer on one side of a support and on the other side the antihalation layer contg. a specified cellulose acetate phthalate. CONSTITUTION:On one side of the support, the silver halide emulsion layer is formed and on its other side, the antihalation layer is formed. This layer contains hydroxyalkyl alkyl cellulose acetate phthalate, such as hydroxypropyl methyl cellulose acetate phthalate, thus permitting the obtained photographic sensitive material to be prevented from the migration of the antihalation material even when this layer contacts with the silver halide emulsion layers at high temp., and this layer to be easily removed at the time of the development.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a silver halide photographic material, and particularly to a silver halide photographic material with an improved halation layer.

(Prior Art) Generally, silver halide photographic materials (hereinafter referred to as "silver halide sensitive materials") have seven or more photosensitive silver halide emulsion layers on one side of a plastic film support. It further has an undercoat layer, an intermediate layer, a filter layer, a surface retaining layer, etc., if necessary, and a pack layer on the other side.

Seventh, the purpose of providing the pack layer is to prevent halation, second, to prevent charging, and third, to control curl balance.

In the present invention, a pack 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.

Seven examples of antihalation layers include 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. ．． 27/, No. 23, Specification Co.

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, J', 2J' have been preferably used as binders for such antihalation layers.

When such binders are used, the antihalation layer can be removed upon processing with an alkaline photographic developer.

Cellulose acetate phthalate has many desirable properties for this purpose; The preventive substance is
There is a tendency for the problem of migration to the surface layer 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 a means to solve such drawbacks, as described in U.S. Pat. The technology of using it as a binder is known.

However, when cellulose acetate hexahydrophthalate or cellulose acetate tetrahydrophthalate is processed with an alkaline photographic developer,
The antihalation layer cannot be removed simply by treatment, and it has the disadvantage that it cannot be removed without forcible wiping or other means.

The fact that the antihalation layer is not easily removed by development is a serious problem in practical applications.

(Objective of the Invention) Therefore, the object of the present invention is to prevent the antihalation substance from migrating 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. An object of the present invention is to provide a silver halide sensitive material from which a no-ration protection layer can be easily removed.

SUMMARY OF THE INVENTION It is an object of the present invention to have at least 1/1 silver halide emulsion layer on one side of the support and at least 7 antihalation layers on the other side. This was achieved by a silver halide photographic material comprising a layer, wherein the antihalation layer contains all of hydroxyalkylalkylcellulose acetate phthalate. .

The content of each substituent in the hydroxyalkyl alkyl cellulose acetate phthalate used in the present invention is not particularly limited, but the content of the hydroxyalkoxyl group is 2 to 70% by weight, -! - Alkoxyl group, 2-3! Weight %, acetyl group 7-10
% by weight, phthalic groups/θ~20% by weight, particularly hydroxyalkoxyl groups 3~/θ% by weight,
Alkoxyl group/θ~, 2j weight coefficient, acetyl group j-2
More preferably, the content is 0% by weight, phthalyl group, and 20 to 20% by weight.

The coating amount of hydroxyalkyl alkyl cellulose acetate phthalate in the antihalation layer of the present invention is O3θ per 7 square meters! ~'gs preferably 0.
21~/g.

Furthermore, the viscosity of the hydroxyalkyl alkyl cellulose acetate phthalate used in the present invention is as follows: The value measured at 3o0C when Og was dissolved in 2t Oml of a mixed solution of acetone-methanol-methyl cellosolve (, to: 71.t:, 2s volume ratio) was! θ~/, θoOcp8, especially 10θ~30θ
Preferably, it is cps.

In the present invention, in order to provide an antihalation layer on a support, a solvent is necessary for the mixture of the binder and antihalation substance according to the present invention, and such a solvent can be used to coat the antihalation layer. Those skilled in the art can appropriately select from those most useful for the particular film support to be used, such as organic solvents consisting of ketones, esters, alcohols, aromatics, and mixtures thereof. Can be mentioned.

Further, halation prevention +h IN Id according to the present invention,
It can be coated on 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 dye can be mixed with the binder used in the present invention. It is also possible to apply a dye layer on the top surface and allow the dye to penetrate into the binder layer.

The vine antihalation dye used in the present invention includes:
Well-known Spirit Blue CR (Color Index AJ
/ri), Nigrosine Spirit Solble (color index A! ni/), Alkaline Blue B (color index 7θg), Congo Red (color index XA, ?7θ), 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 an 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, shellac, seratin, hydroxypropyl cellulose, or a paint dissolving aid such as acetin. When an acid-based vinyl copolymer is used in combination, an excellent matte anti-nolation layer can be formed.

□ Furthermore, for the purpose of imparting slipperiness to the surface of the no-ration prevention layer, for example, US Patent No. J, 4#9, 46
No. 7, same No. gu, θ Gua 19! No. ♂, No. gu, yθp,
No. 27, British Patent No. 1, /4t3.

//F, etc., can be used in combination with the binder of the present invention, or can be applied as an overcoat.

Similarly, for the purpose of imparting surface mattness, particles made of silicon dioxide, polymethyl methacrylate, polyacrylonitrile, etc., with a size of 0.7 to /θμ, especially /~μ
A matting agent can also be used.

Various materials used in the silver halide emulsion layer of the present invention, such as silver halide emulsions, hydrophilic binders, chemical sensitizers, hardeners, color couplers, surfactants, antistatic agents,
There are no particular restrictions on the lubricants, sensitizing dyes, dyes, anti-fading agents, etc. For example, Re5earch Disclo
sure / Vol. 74, No. J, pp. 2-3.2 (797F, 7
You can refer to the description in February).

The present invention will be further explained below with reference to Examples.

Example-/ Cellulose triacetate film support (thickness/3θ
A coating solution having the composition shown below was applied to one side of the film to form a no-ration prevention IF layer. 3. Silver halide emulsion layer (AgBrI emulsion, ■=2 molt) on the other side. Sensitive materials A to D were prepared by providing a gelatin surface protective layer (/, θμ) on the gelatin surface protective layer (/, θμ).

−/θ− Antihalation layer coating liquid composition A Polymer − (3 parts>
CAP”1*ICA P: Cellulose acetate phthalate (%2) 11PMCP: Hydroxypropyl methylcellulose (hydroxyzorobyl group, methyl-+a CAHHP: Cellulose acetate hexahydro (acetyl group 23, hexahydro+4) HPMCAP: Hydroxypropyl methylcellulose (Hydroxypropyl group cuti, methyl-l/-B CDC invention) HPMCP"2CA)i HP"3 HPMCA
P"4 cetyl group 23%, phthalyl group 36%) phthalate group / j%, phthalyl group 3%) phthalate phthalyl group 3%) acetate phthalate group / 3%, acetyl group r, phthalyl group 36%) Sensitive material A
-D is carbonated soda! The sample was immersed for 5 seconds in an alkaline aqueous solution consisting of 700 parts of Glauber's Salt, 2J parts and 700 parts of water, and 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 ° Subsequently, each sensitive material was left for 7 days at θ0C♂0%RH, and then the surface of the halation layer and the surface of the emulsion protective layer were bonded. We investigated the extent of

Sensitive material A: Burnt] Adhesion 4 B: J I C: 1% 1 From the above results, it can be seen that the sensitive material according to the present invention is excellent in both the removability and adhesion of the antihalation layer. .

Procedural amendment Showa Tata 11th year [1

Claims (1)

[Claims] 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 light-sensitive material, characterized in that it contains hydroxyalkylalkyl cellulose acetate phthalate.