JPS59200234A - Photographic support - Google Patents

Abstract

PURPOSE:To obtain a photographic support giving a photographic image high in resolution by coating a support with a prescribed white coating compsn. to form a white reflective layer. CONSTITUTION:A binder soluble at room temp. in solvents low in toxicity, such as PVC, a vinyl chloride-vinyl acetate copolymer, or polystyrene, is dissolved in an org. solvent, such as acetone or methyl ethyle ketone, and TiO2 or the like is mixed as a white pigment. Paper coated with resin, such as PE or PP, or PE or other polymer film is coated with said soln. and dried to obtain a white reflective layer. This support is subjected to an activation treatment using corona discharge in advance, and primed with gelatin, and then, coated with an emulsion for a color photographic printing paper to obtain a photographic printing paper. As a result, an image high in resolutions is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to photographic supports, and more particularly to supports for photographic paper.

As a support for photographic paper, barium sulfate is dispersed in gelatin and a 7'C suspension is coated on the surface of the base paper to obtain a so-called baryta paper with a white reflection of 1t-.Recently, polyolefin resin filled with titanium oxide is used as a support for photographic paper. So-called fat-reinforced VC paper, which is made entirely of cardboard and has been loosened, is used.

A photographic emulsion is coated on the surface of baryta paper.
i It has the disadvantage that the base paper absorbs and takes a long time to dry.

In order to overcome this drawback, recently, photographic paper in which a photographic emulsion is coated on resin-coated paper such as polyethylene has been mainly used.

However, compared to photographic images obtained from photographic paper using conventional baryta paper as a support, photographic images obtained from photographic paper using polyolefin-retained paper as a support have a disadvantage in that their resolution is inferior.・I'm bored.

The cause of this defect is that there is less white pigment incorporated into the polyolefin layer, which is loosely attached to the surface of the polyolefin-coated support that comes into contact with the photosensitive silver halide emulsion.
It is thought that this is because the continuous effect is not sufficient and light is scattered by the polyolefin layer.

Titanium oxide is usually used as a white pigment, but
In order to increase the amount of filling into polyolefin, the entire surface coating of titanium oxide was completely improved! -10do6jt issue, JP-A-1973-. 3! ;155
It is disclosed in the Japanese Patent Publication No. 270≠6 VC that it can be used in combination with other pigments. However, even in the case of Izuku, the possible filling amount of titanium oxide is
It is only swt%.

Therefore, a white pigment layer consisting of a white pigment and a hydrophilic colloid solution is provided on the film or resin-coated paper.
A method of forming a photographic emulsion layer on the white pigment layer is disclosed in Tokukoan, No. f'l-33737, JP-A No. 6, 23.
There are 5 hats listed. This 'i' is written n7 (
In photographic paper using a support, the binder in the white pigment layer is hydrophilic, so it is difficult to use a developing solution or water. Photographic paper V whose support is polyolefin-covered paper that is normally dried in order to absorb
It has the disadvantage of being slower than its predecessor.

1 A method of applying an aqueous emulsion consisting of a trap-ho occupying agent and a pigment is described in JP-A No. 30-11-4Q7.
ing. However, with water-based application, the drying load is large,
It has the disadvantage that production cannot be carried out at high speed or that the entire drying zone must be very large. Furthermore, when using emulsion, gravure roll or bar application'x
If it is carried out in the Aljt method, the mechanical stability of the emulsion deteriorates, resulting in disadvantages such as the inability to apply it uniformly. Therefore, the object of the present invention is to improve the above-mentioned disadvantages and to use the emulsion as a support for photographic paper, The objective is to obtain photographic images with high resolution on IL photographic supports.

The above object of the present invention is to coat a white pigment on a substrate and
2. Example fabric composition containing binder for each bath agent? ! - achieved by a photographic support characterized by a white reflective layer provided on the substrate after coating and drying.

In the present invention, examples of the binder used as a white pigment include acrylic, polyester, poly, amide, cellulose, polyvinyl, etc.M'4H
If you can bathe in solvent V, you can also use chair IL. However, from the viewpoint of economy and ease of handling, T1. A binder that dissolves at room temperature in a low toxicity solvent is desirable.

Further, since K is used for photographic purposes, it is required to have properties such as good adhesion to the photographic emulsion layer and no coloring caused by the developer during the development process.

Examples of binders that are preferably used in the present invention and are difficult to use include acrylic resins such as polymethyl methacrylate and Criscort (trade name), polyester resins such as Vylon (manufactured by Toyobo), cellulose ridge resins such as ethyl cellulose, polystyrene, polyester resins, etc. These include homopolymers and copolymers of vinyl resins such as vinyl chloride and polyvinyl acetate, and blends thereof.

The most preferred are polyvinyl chloride, vinyl vinyl acetate copolymer, polyvinyl acetate, and polystyrene. The vinyl chloride of the vinyl chloride-vinyl acetate co-electrolyte and the copolymerization ratio of the vinyl are not limited to Ti1, but the third component is vinyl alcohol, acrylic alcohol,
It may also contain components such as maleic anhydride. The polystyrene may be a homopolymer of styrene or may be polystyrene grafted with a butadiene component (T1.7).

These binders are dissolved in an organic solution and applied to a substrate along with a white pigment.

The '/Pi1' bath agent to be used is one that dissolves these binders, has low toxicity, and has good IL properties; for example, acetone, methyl ethyl ketone, etc. are preferably used.

Examples of the white pigments used in the white pigment layer of the present invention include titanium dioxide, 6fE
Contains calcium, barium carbonate, charcoal calcium, lithopone, alumina white, porphyry, antimony dioxide, titanium phosphate, etc.

Titanium dioxide is particularly preferred because it has great hiding power. Titanium dioxide may be of the rutile type or anatase type, and may also be one made by a sulfuric acid method or one made by a base method. Titanium oxide is treated with a non-vibration surface treatment such as Gensui alumina treatment and/or Miyamizu silicon dioxide type treatment, or trimethylolmecune, t')) fO-ruethane, trimethylolpropane, 2 ．． It is preferable to use a trap treated with an organic coating such as V dihydroxy-2-methyl tantan, or a surface treated with a surfactant.

When separating white pigments, it is possible to use dispersion aids such as surfactants as necessary, and various dispersion machines (for example, homomixers, homogenizers, ball mills, colloid mills, etc.) can also be used. When used, a preferable fine dispersion can be obtained.The white pigment layer contains organic dyes or inorganic pigments, fluorescence enhancers, hardeners, antifogging agents, stabilizers, or tetrazaindenes. Alternatively, various photographic additives such as tetrazoles and other coloring inhibitors during the development process can be added.

In the present invention, the white pigment is about 20% relative to the binder.
Graded prize % or better 1st grade, 3rd grade opener.

% by weight, and the amount of white pigment applied ranges from about 39 to about 20 ff per square meter.

If the coating amount of white pigment is less than 37/m, the hiding power will be low;
There are no high-resolution photographic images available from Samurai. Further, even if the coating amount of the white pigment is increased to 2077 m2 or more, the obtained resolution remains the same, which is wasteful in terms of cost.

The coating liquid according to the present invention can be applied by a generally well-known coating method.
For example, dip coating method, air knife coating method, curtain coating method, roller coating method, doctor coating method,
Wire barcode method, slide coating method, gravure coating method or U.S. Patent No. 2. tza/, -22≠No.1lI
It can be applied by the extrusion coating method using all the hoppers described in the 4 specifications.

11. Used in the present invention. The main body is resin-covered paper coated with polyolefin such as polyethylene or polypropylene,
Synthetic polymer films such as polyethylene film, polypropylene film, polystyrene, polyethylene tereph, υ tallate, polycarbonate, and hard-purchased vinyl chloride, natural crystalline molecular films such as cellulose diacetate, cellulose triacetate, and nitrocellulose, or natural valves and synthetic valves. Examples include paper etc. made of

It is desirable that these substrates be pretreated in advance to ensure strong adhesion to the binder layer containing the white pigment.

Pretreatment methods include immersion in an oxidizing agent solution, flame treatment, corona discharge treatment, glow discharge treatment, ultraviolet J
Although there are activation treatments such as the JJI shooting method, it is preferable to perform a corona discharge treatment as an economical method since the plate also has a dark value.

A variety of silver halide photographic emulsions can be used as silver halide photographic emulsions for the silver halide photographic constituent layers, which are particularly advantageously used to remove unexploded ψ. For example, silver halide compositions include silver chloride, silver bromide, silver chlorobromide, silver chloroiodobromide, silver iodochloride,
An emulsion made of silver iodobromide or a mixture thereof can be used appropriately depending on the purpose.Also, it is also possible to use a molded silver halide emulsion, if necessary. In that case, it is also possible to use a direct positive type silver oxide emulsion. The photographic constituent layer may be provided directly on the white color layer, or a gelatin undercoat layer may be provided and the photographic constituent layer may be provided thereon.

Furthermore, when a photographic constituent layer or an undercoat is provided directly adjacent to the white pigment j-, it is desirable that the entire surface of the white pigment layer be subjected to a surface treatment such as corona treatment.

Example: The polyethylene side of the polyethylene paper was treated with corona treatment, and the binder, the N ratio between the binder and the rutile titanium oxide, 2, and the coating amount of titanium oxide after drying were determined. It was applied so that it would look like a trap as shown in Table 1. (Methyl ethyl ketone is used as a bath agent for Al~A, /I, and water sound trap is used for Flat/Li~2≠)
Then, after corona treatment, an undercoat of gelatin was applied at a coating amount of 0.000% on the white pigment layer. jlf/m goes π. Apply color photographic paper emulsion on top of the paper to create photographic paper.

Is the photographic paper that I created processed according to the standard water treatment process? death,
A trap that measures the liquid absorption key in the process. The degree of coloring was evaluated by visual judgment of the white part of the white background part of the trap image. In addition, the resolution was evaluated from images obtained by contact printing from the same negative.

Further, as a comparison sample, a photographic paper made of ordinary polyethylene-coated paper without a white pigment coating layer was used.

In the coloring column of Table 1, × indicates that the coloration is impractical and Q indicates that there is no coloration. In the resolving power column, X indicates that the resolution is worse than the resolution level of ordinary photographic paper (indicated by Δ), Q indicates good, and ◎ indicates even better.

The photographic paper (76,/-16,/j) of the present invention has liquid absorption during development processing that is equivalent to that of ordinary photographic paper, and is not colored.

It can be seen that the resolution is also improved, except for all of the flat surfaces 3 where the amount of TiO2 applied is small.

On the other hand, in the samples from 16/A to 2017, the absorbency was equivalent to that of normal photographic paper, but there was coloration during the development process, and the paper price was not worth 1 yuan as a photographic paper.

Also JP6. / In the samples with Y~2≠, as the amount of white pigment applied increases, the amount of g absorbed during development increases, and it takes η · time to dry after development, resulting in a dark paper as a photographic paper. Not in the quality value.

Patent applicant: Fuji Photo Film Co., Ltd. 253-

Claims (2)

[Claims] (1) A photographic support comprising a white reflective layer formed on the substrate by coating and drying a coating composition containing a white pigment and a binder soluble in an organic solvent. (2) The photographic product according to claim 1, which contains at least seven kinds of polymers V selected from polyvinyl chloride, vinyl chloride-acetic acid copolymer, polyvinyl acetate, and polymethylene as a V solvent-soluble binder. support.