JPS6089394A - Image formation material - Google Patents

Abstract

PURPOSE:To enable a high-density image by providing a heat-sensitive layer with a coloring layer allowing a developer liquid to permeate to lower the dissolvability of the developer liquid at a part exposed to light while the dissolvability at the non-exposed part is held as intact. CONSTITUTION:This material has a support, a heat-sensitive layer whose the dissolvability lowers with respect to a developer liquid by heating and a coloring layer unsoluble in the developer liquid and allowing it to permeate. The heat-sensitive layer is arranged closer to the support from the coloring layer. When the image formation material thus obtained undergoes a laser light scanning and an exposure from the side of the support, light irradiated to the heat-sensitive layer through the support is converted into heat, by which thermoplastic polymer particles of the thermosensitive layer melts and the portion melted lowers in the dissolvability with respect to a developer liquid such as water. Under such a condition, when water is applied to the material from the side of the coloring layer and a rubbing is given, water permeates to the heat-sensitive layer to dissolve only the portion of the heat-sensitive layer exposed to no light and then, the portion of the coloring layer is washed away. This forms a printing part insoluble in the developer liquid and a non-printing part soluble therein thereby yielding a manuscript.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an image forming material, and more specifically, in a coated image forming material having a heat-sensitive layer whose solubility decreases when irradiated with high-density energy light, The present invention relates to an image-forming material which is provided with a colored layer which is insoluble in water and permeates the developer, thereby requiring less recording energy and making it possible to obtain high-density images.

PRIOR ART Films such as manuscripts for planographic production are also produced using silver halide photographic materials.
Since silver materials are problematic in terms of resources, a rise in silver prices is inevitable. Therefore, various image forming materials have been proposed to which a so-called thermal pattern is applied, in which an image area and a non-image area can be formed depending on the presence or absence of heating. These image-forming materials have a heat-sensitive layer on a support, which is irradiated with high-density energy light such as laser light, converts this high-energy light into thermal energy, and uses this heat to insolubilize and melt the heat-sensitive layer. , thermal (recording by evaporation or combustion)
Heat mode) recording materials are known. A recording method for such a thermal recording material includes, for example, an i to be recorded.
There is a method of forming an image by converting the blueprint into an electrical time-series signal, modulating a laser beam according to the signal, and scanning the recording material with the modulated laser beam. Since recording can be performed by irradiating laser light for an extremely short period of time, information processing can be performed quickly and is also economical.

Conventionally, such a thermal recording material is known, for example, as described in Japanese Patent Publication No. 46-40479, the recording layer is composed of three layers of germanium, bismuth, and selenium. Further, a heat-sensitive recording material provided with a layer for reducing heat conduction between the recording layer and its support is described in Japanese Patent Application Laid-Open No. 126237/1983. Furthermore, Japanese Patent Publication No. 51-14263 also describes a heat-sensitive recording material provided with a protective layer and a heat insulating layer.

However, the methods described in these publications all require vacuum-based equipment such as vapor deposition or sputtering, making the produced recording material extremely expensive and the production process complicated. Furthermore, selenium,
Tellurium, bismuth, indium, tin, or sulfides, fluorides, oxides, etc. of these metals have disadvantages such as being harmful to the human body, undesirable from a sanitary standpoint, and having a high risk of causing pollution.

On the other hand, Japanese Patent Publication No. 51-35144 discloses that a recording layer in which an energy absorbing substance is dispersed in a self-oxidizing binder is provided on a transparent support, and a laser beam is irradiated through the support. There is a description of an image recording method in which the recording layer is blown away. However, the recording layer produced by this method is easily damaged, has extremely low film strength, and has poor resolution. Furthermore, this recording method has drawbacks such as requiring a large amount of recording energy.

Therefore, it is possible to manufacture the heat-sensitive layer at low cost by applying paint, and this heat-sensitive layer has high sensitivity, high resolution, is non-toxic, and furthermore, is used as a thermal recording material with a high film strength. Various so-called wash-off type heat-sensitive recording materials have been proposed.

For example, Japanese Patent Publication No. 44-22971 discloses that photothermal conversion particles for converting light into heat and hydrophobic thermoplastic polymer particles dispersed in a hydrophilic resin are placed on a support and the latter is 1:1 more than the former.
A heat-sensitive layer is provided in which the mixture is mixed in a proportion of more than 1, and the heat-sensitive layer is irradiated with, for example, a laser beam to convert this light into heat, and the heat fuses the hydrophobic thermoplastic polymer, making it insoluble in a developer and A heat-sensitive recording material has been proposed in which an image is formed by dissolving areas not exposed to light with a developer. Further, JP-A-52-82431 discloses a heat-sensitive recording material containing albumin as a heat-sensitive component;
No. 148590 proposes a heat-sensitive recording material using an ionomer resin as a heat-sensitive component. In addition, the present inventors disclosed in Japanese Patent Application Laid-Open No. 57-59799 that in a heat-sensitive recording material in which the heat-sensitive portion of the heat-sensitive layer becomes insolubilized, the heat-sensitive layer is provided on a transparent support, and the heat-sensitive layer is passed through the support. A recording method using high-density energy light exposure was proposed.

However, even when using this recording method,
For example, when scanning exposure is performed using a laser beam, the exposure time is very short, for example, on the order of μs''-'ns. In the near heat-sensitive layer, a large amount is absorbed and converted into heat, and this heat can raise the temperature enough to make it insolubilized, but if the heat transfer in the membrane direction is insufficient, the temperature at the surface layer of the membrane does not rise enough to make it insolubilized. A problem arises in that only a part of the heat-sensitive layer becomes insolubilized.If the heat sensitivity of the surface layer of the heat-sensitive layer is insufficient, when the non-exposed area is later melted and removed with a developer, this surface layer will also be melted. As the film thickness of the image forming area becomes smaller, the image density decreases.To avoid this, the intensity of the irradiated light must be increased, which requires an excessive amount of energy. This is not only undesirable from the point of view of energy saving, but also reduces the sensitivity of the image forming material to light, so an improvement has been desired.

OBJECTS OF THE INVENTION A first object of the present invention is to provide an image-forming material capable of obtaining high-density images.

A second object of the present invention is to provide an image forming material that can be recorded with less energy.

Structure of the Invention In order to achieve the above object, the present invention provides a colored layer in the heat-sensitive layer that is insoluble in the developer and permeates the developer, thereby improving the solubility of the portion of the heat-sensitive layer exposed to light in the developer. The image area is formed together with the colored layer in this part, while the part of the heat-sensitive layer that is not exposed to light remains soluble in the developer that has penetrated from the colored layer, and as this part dissolves, it forms an image area. The colored layer corresponding to the color layer is melted and removed. In this way, the insolubilized portion can be localized to a portion that is easily exposed to light, so that the amount of irradiation energy can be reduced, and the loss of the colored layer to the developer can be reduced to keep its density high.

To this end, the present invention provides an image-forming material comprising a support, a heat-sensitive layer whose solubility in a developer decreases when heated, and a colored layer that is insoluble in the developer and allows the developer to permeate, the heat-sensitive layer is characterized in that it is provided closer to the support than the colored layer.

The present invention will be explained in detail below.

The heat-sensitive layer used in the present invention is of a negative type, which converts the light into heat when irradiated with light, and this heat reduces the solubility in a developer. Any type of layer may be used, but preferably a thermosensitive layer containing thermoplastic polymer particles. Such polymer particles have the form of particles when not heat-sensitized, and when heat-sensitized and softened, they fuse together to form a film that prevents them from being washed away by a developer such as water. The solubility will decrease.

It is preferable that the polymer particles are those that do not decrease their solubility in a developer at the temperature during storage, for example room temperature, but fuse when exposed to light and decrease their solubility in a developer. Preferably, the softening occurs at a temperature of 10°C to 100°C above room temperature. Examples of the polymer of such polymer particles include polyethylene, polyvinylidene chloride, polystyrene, polymethyl methacrylate, polyvinyl chloride, polyacrylonitrile, poly-N vinylcarbazole, etc., but particularly preferred are ionomer resins, For example, a copolymer of ethylene and acrylic acid or methacrylic acid may be used as Na"sM, '22
Examples include ionomer resins crosslinked with metal ions such as F and 4. This ionomer resin has a high fused film strength.

The heat-sensitive layer used in the present invention may contain some binder, especially a hydrophilic binder, in order to improve the solubility of the polymer particles in a developer such as water. Examples of such hydrophilic binders include gelatin, glue, casein, zein, hydroxyethyl cellulose, carboxymethyl cellulose, methyl cellulose, carboxymethyl hydroxyethyl cellulose, hydroxyethyl starch, gum arabic, sucrose octaacetate, ammonium alginate, sodium alginate, Examples include polyvinyl alcohol, polyvinylpyrrolidone, polyvinylamine, polyethylene oxide, polystyrene sulfonic acid, polyacrylic acid, and the like. In the present invention, polyvinyl alcohol is preferable, and particularly vinyl alcohol having a saponification degree of 85 to 90% is preferable.

When a thermoplastic polymer and a water-soluble polymer compound are used in the heat-sensitive layer used in the present invention, the mixing ratio of the thermoplastic polymer and the water-soluble polymer compound (especially polyvinyl alcohol) as a binder is The weight ratio is preferably 2=3 to 9:1, but is not limited thereto. If the mixing ratio of the thermoplastic polymer is less than 2:3, the strength of the image area may be insufficient, and conversely, if the mixing ratio of the thermoplastic polymer is too high, the meltability of the non-image area may be insufficient. It may disappear.

It is desirable to add pigments and dyes to the heat-sensitive layer used in the present invention in order to effectively convert light into heat and utilize high-density energy such as YAG laser, bamboo laser, or He-Ne laser. . Pigments or dyes used for this purpose can be any pigment or dye that converts a pattern of X-rays, ultraviolet light, visible light, infrared light, etc. into a thermal pattern, but in particular, carbon graphite, carbon blank, phthalocyanine, etc. can be used. Pigments having absorption in the visible and near-infrared regions such as pigments, iron powder, graphite powder, iron oxide powder, lead oxide, and blackened silver are preferred, and carbon blank is particularly desirable in terms of its absorption.

When a pigment or dye is used in the heat-sensitive layer used in the present invention, it is desirable that the mixing ratio of the pigment or dye is 5 to 50% by weight based on the heat-sensitive layer in terms of film strength and light absorption. .

In addition, the thermosensitive material used in the present invention is also disclosed in JP-A-52
Albumin described in Japanese Patent Publication No. 82431 and a polymer compound that folds into a granular shape described in Japanese Unexamined Patent Publication No. 53-50753 are also preferably used.

The thickness of the heat-sensitive layer used in the present invention is 0.5 to 4.
0μ is preferred. If the thickness of the heat-sensitive layer is thicker than 4.0 μm, the sensitivity, that is, the degree of heat sensitivity to light, decreases, and the thickness becomes 0.0 μm.
If it is thinner than 5μ, sufficient image intensity cannot be obtained.

Next, the colored layer used in the present invention will be explained. This colored layer is insoluble in the developing solution but has the property of allowing the developing solution to permeate, and the portion where the lower heat-sensitive layer is dissolved and removed by the developing solution that has penetrated this colored layer, that is, the non-image This is the part of the heat-sensitive layer that is rubbed off and remains in the developing solution, that is, the part that remains in the image area and constitutes the main part of the image area.

This colored layer is formed by dispersing, mixing, or dissolving a pigment or dye as a coloring agent in a binder, and the pigment is an organic pigment or an inorganic pigment (Pigment Handbook: Japanese Pigment Technology Association Report and JP-A No. 47-16124). The dyes are appropriately selected and used from those described in Japanese Patent Laid-Open No. 16124/1984, and the like.

Note that an ultraviolet absorber is also used here. This is because ultraviolet rays are used when exposing a developed film to create, for example, a lithographic plate, so light absorption in the image area can also be achieved with an ultraviolet absorber.

When the image forming material of the present invention is used as a lithographic printing original, it is particularly preferable to use carbon black as a colorant. This is because the covering power (hiding power) of carbon black is high, so the film thickness can be reduced to obtain the same density, and image reproducibility is good.

Various polymer compounds can be used as the binder for the colored layer, but water-softening polymer compounds are preferred when water is used as the developer.

A water softening polymer compound is a compound whose Young's modulus decreases in the presence of water, and its moisture content is 80% relative humidity (25%).
℃) is preferably 1.5% to 30%. Examples of such water-softening polymer compounds include methylcellulose, ethylcellulose, butylcellulose,
Hydroxyethyl cellulose, carboxymethyl cellulose, cyanoethyl cellulose, cellulose acetate, roulose triacetate, cellulose acetate butyrate, cellulose acetate phthalate, hydroxypropyl methyl cellulose fucrate, hydroxypropyl methyl cellulose hexahydrophthalate, polyacrylic ester, polymethacrylic ester, polyvinyl Examples include butyral, polymethylvinyl ketone, nylon 66, polyamide, polyvinylmethoxyacecool, polyvinyl acetate, epoxy resin, polyurethane, and the like.

Among the compounds mentioned above, the degree of water solubility of the compounds such as cellulose can be easily adjusted by changing the type of substituent and the degree of substitution. For example, cellulose is insoluble in water, but in the case of methyl cellulose, which has a methoxy group introduced therein, the degree of substitution is 1.6 to 2.
Those with a degree of substitution of 0 are water-soluble, and those with a degree of substitution of 2.4 to 2.8 are water-softening. Furthermore, ethyl cellulose into which ethoxy groups have been introduced is water-soluble if the degree of substitution is less than 1.5.
Those with a degree of substitution of 2.2 to 2.6 are water-softening. As described above, substituents, degree of substitution, etc. can be appropriately determined by those skilled in the art within the scope of the above-mentioned definition of water-softening property.

In addition to the above, addition polymers having a carboxyl group in the side chain, such as methacrylic acid copolymers, acrylic acid copolymers,
Examples include itaconic acid copolymers, partially esterified maleic acid copolymers, maleic acid copolymers, and crotonic acid copolymers.

Addition polymers having a hydroxyl group, carbamoyl group, or dimethylamino group in the side chain are also used, such as vinyl alcohol copolymer, vinyl aryl alcohol copolymer, methylene diethyl malonate copolymer (reduced product), maleic anhydride. Acid copolymer (reduced product), acrylamide copolymer, methacryamide copolymer, N,N-dimethylaminomethyl methacrylate copolymer, N,N-dimethylaminoethyl acrylate copolymer, N,N-dimethyl Examples include aminoethyl methacrylate copolymer.

In addition to these, vinylpyrrolidone copolymers and the like are also useful. The molar ratio of carboxy groups, hydroxyl groups, carbamoyl groups, and dimethylamino groups in the above copolymer varies depending on the types of other copolymer components, and is determined within the scope of the above-mentioned definition of water softening property. Such polymer compounds may be used alone or in combination of two or more.

Further, a water-soluble polymer compound obtained by adding a crosslinking agent to reduce water solubility can also be treated as a water-softening polymer compound as long as it falls within the above definition of water-softening property. Water-soluble compounds used at this time include polyvinyl alcohol, gelatin, cellulose compounds, etc.
Examples of the crosslinking agent include urea/formalin resin, methylolmelamine resin, glyoxal, tannic acid, and citric acid.

The colorant/binder ratio of the colored layer can be determined by methods known to those skilled in the art, taking into account the target optical density. In particular, when a water-softening polymer compound is used as the binder, a pigment is used as the colorant, and water is used as the developer, the ratio of colorant/binder is desirably 1.0/2.0 or more.

The thickness of the colored layer is preferably 0.5 to 4 μm. 0.5μ
If it is thinner, it is difficult to obtain sufficient concentration.

If it exceeds 4μ, the reproducibility of small dots and thin lines may be poor and the image quality may deteriorate.

As for the thickness ratio between the heat-sensitive layer and the colored layer, it is desirable that the colored layer is thinner than twice the thickness of the heat-sensitive layer. If the thickness of the colored layer exceeds twice the thickness of the heat-sensitive layer, it may become difficult to reproduce details.

The support used in the present invention is preferably transparent, but slightly opaque or colored supports can also be used. For example, cellulose diacetate, cellulose triacetate, cellulose propionate, cellulose acetate,
Examples include plastic films or glass plates such as cellulose acetate/butyrate, cellulose nitrate, polyethylene terephthalate, polyethylene, polystyrene, polypropylene, polycarbonate, polyvinyl acecool, etc. Among these supports, polyethylene terephthalate is preferred.

These supports are surface-treated by one or more combinations of chemical treatment, discharge treatment, flame treatment, ultraviolet treatment, high-frequency glow discharge treatment, activated plasma treatment, etc. to improve the adhesion of the heat-sensitive layer. desirable for this reason.

In the image forming material of the present invention, a subbing layer may be provided between the support and the heat-sensitive layer to improve physical properties such as adhesive strength. Suitable materials for forming this undercoat layer include acrylic acid ester resin, vinylidene chloride resin, vinylidene chloride acrylonitrile copolymer resin, vinylidene chloride acrylonitrile-itaconic acid copolymer resin, vinylidene chloride-acrylonitrile-methyl acrylate copolymer, Vinyl chloride/vinyl acetate/maleic anhydride copolymer resin, alkyl ester of acrylic acid or methacrylic acid amide and acrylic acid or methacrylic acid, fatty acid vinyl ester, copolymer resin with styrene or acrylonitrile, fucuric acid or isophthalic acid and glycol Examples include copolyester resins, polymers or copolymers of glycidyl acrylate or glycidyl methacrylate.

In addition to the above-mentioned components, many synthetic resins are known as components for forming the subbing layer, and methods for preparing the coating liquid and coating methods are well-known techniques in the photographic material manufacturing industry to which the present invention belongs. Therefore, you can apply them as appropriate.

In general, the above-mentioned synthetic resin is made into a solution or latex with water or an organic solvent, and this is applied onto the support by a known coating method such as Giesser coating, roll coating, air knife coating, or spray coating.

The thickness of the coating film is preferably 0.05μ to 1.0μ.

In the image forming material of the present invention, a heat-sensitive intermediate layer may be further provided between the heat-sensitive layer and the support or subbing layer.

Specifically, the intermediate layer as described in Japanese Patent Publication No. 45-39239, and especially the one described in Japanese Patent Publication No. 57-6909.
An intermediate layer using an ionomer resin described in Japanese Patent No. 5 is desirable.

Further, in order to prevent scratches on the surface of the colored layer of the image recording material of the present invention, an overcoat layer that melts or swells during development may be provided. This overcoat layer may be a mechanically capped layer or a resin layer containing a capping agent. As a matting agent, silicon dioxide,
Zinc oxide, titanium oxide, zirconium oxide, glass particles, alumina, starch, polymer particles (e.g. particles of polymethyl methacrylate, polystyrene, phenolic resins, etc.) and U.S. Pat. No. 2.701. , No. 245, No. 2
．． 992,101 are included. Two or more of these can be used in combination. The resin used in the overcoat layer containing the matting agent is selected as appropriate.Specifically, for example, gum arabic, glue, gelatin, casein, cellulose M (for example, viscose, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxy propyl methylcellulose, carboxymethyl cellulose, etc.), starch@(
Examples include soluble starch, modified starch, etc.), polyvinyl alcohol, polyethylene oxide, polyacrylic acid, polyacrylamide, polyvinyl methyl ether, polyvinyl pyrrolidone, and polyamide. Two or more of these can also be used in combination.

To produce the image forming material of the present invention, for example, a thermoplastic resin dispersion, a hydrophilic binder, and a pigment or dye are mixed and uniformly dispersed using a ball mill, an ultrasonic disperser, or the like. This obtained dispersion was placed on the support with a 0.5μ
It is coated to a thickness of ˜4.0 μm and dried at a temperature of 30° C. to 50° C. to provide a heat sensitive layer.

Further, for example, a water-softening resin and a pigment or dye are mixed and uniformly dispersed using a ball mill, an ultrasonic disperser, or the like.

The obtained dispersion liquid is applied onto the heat-sensitive layer to a thickness of 0.5 to 4.0 μm and dried at a temperature of 30° C. to 50° C. to form a colored layer. In this way, the image forming material of the present invention is obtained.

When the image forming material of the present invention obtained as described above is subjected to scanning exposure with laser light from the support side, the light irradiated to the heat-sensitive layer through the support is converted into heat. The thermoplastic polymer particles of the heat-sensitive layer are fused together,
This fused portion has reduced solubility in a developer such as water. In this state, if you sprinkle water on the colored layer side and rub it with a sponge, for example, the water will not dissolve the colored layer, but will penetrate it and reach the heat-sensitive layer, dissolving only the parts of the heat-sensitive layer that are not exposed to light. The part of the colored layer supported on this part is washed off.

As a result, an image area that is insoluble in the developer and a non-image area that is soluble in the developer are formed, and a document for lithography, for example, is completed.

The image forming material of the present invention can be exposed to laser light such as a semiconductor laser, Ar or He-Ne laser light, but contact exposure can also be performed using a xenon lamp, halogen lamp, tungsten lamp, etc. as a light source. In this case, a flash light source having a light emission time of about 1/1000 seconds or less and a high light intensity in the infrared region is preferable.

The image forming material of the present invention can be used as a facsimile film or a lithographic mask by scanning exposure with laser light, and can also be used as a high-resolution lithographic film at low cost.

Effects of the Invention As described above, in the present invention, a colored layer is provided in the heat-sensitive layer to allow a developer that is insoluble in the developer to permeate, so that the solubility of the colored layer is reduced depending on whether or not the underlying heat-sensitive layer is exposed to light. Alternatively, as a result of being left behind or removed depending on whether it is soluble, it is possible to distinguish between image areas and non-image areas in the heat-sensitive layer, and maintain the density mainly in the colored layer. For this reason, the heat-sensitive layer can be made thinner, and as a result, the heat-sensitive layer becomes insolubilized in any part of the film thickness direction even when exposed to laser light that is irradiated with a very short exposure time on the order of μ5-ns. It is possible to raise the temperature, and it is possible to more reliably reduce the /8 dissolubility of the entire membrane or to select soluble materials. Also,
As a result of being able to reduce the thickness of the heat-sensitive layer, the intensity of the irradiated energy light can be reduced and the sensitivity to the irradiated light can be improved. Furthermore, since the colored layer maintains its original color density without loss to the developer, its density can also be increased. In this way, an image forming material that achieves both low energy exposure and high density can be provided.

EXAMPLES Next, the present invention will be described in detail with reference to Examples, but the present invention is not limited thereto. Note that parts indicate parts by weight.

Example 1 Carbon black (average particle size 30 m', c+) 2 parts Corbolene latex L-40005 parts (40% aqueous dispersion of ionomer resin manufactured by Asahi Dow@) 10% Gohsenol GL-05 aqueous solution 20 parts (saponified polyvinyl alcohol) 86.5-89% (manufactured by Nippon Gosei) Water 13 parts The composition according to the above formulation was dispersed for 30 minutes using glass beads, and the resulting dispersion was applied to a 100μ thick polyethylene with a gelatin undercoat layer prepared in advance. It was applied onto a terephthalate (PET) film using a wire bar so that the weight after drying was about 20 mg/dm. This was dried at 50° C. or lower to prepare a test piece having a heat-sensitive layer.

IP-505 parts (Hydroxypropyl methylcellulose phthalate, manufactured by Shin-Etsu Chemical II) Carbon blank (average particle size 30 mμ) 5 parts Methyl cellosolve 90 parts The composition according to the above formulation was dispersed for 60 minutes using glass beads, and then applied to the heat-sensitive layer of the above test piece. The coating was applied using a wire bar so that the weight after drying was 10 mt71M.

This test piece was dried at 50° C. or lower to prepare a recording material test piece of this example.

The recording material test piece was wound around a rotating cylinder, and while rotating at high speed, recording was performed from the support side using an argon laser. The laser power at this time was 168 W, and the scanning speed was 23.56 m/see.

Next, the test piece scanned with this laser beam is immersed in water,
When rubbed with a sponge, the unexposed areas were removed and an image was obtained in which the exposed areas were black.

The transmission density of the obtained image was measured with PDA-65 (Sakura densitometer, manufactured by Konishiroku Photo Industry @) and was found to be 4.0 or more.

Comparative Example 1 Carbon blank (average particle size 30 mμ) 2 parts Kobolene Latex L-4000' 5 parts (described above) 10% Gohsenol GL-05 water/8 liquid 20 parts (described above) Water 13 parts Drying the composition with the above formulation The amount of N after is 40mg/do
? Coating was carried out on PET in the same manner as in Example 1 except for the following.

This comparative sample was exposed in the same manner as in Example 1. The transmission density of this comparative sample before development was measured in the same manner as in Example 1 and was found to be 4.0 or higher.

This sample was then developed in the same manner as in Example 1 to obtain an image in which the exposed areas were black.

When the transmission density of the obtained image was measured, it was found to be 2.2, which was found to be significantly lower than before development.

Cloudy Example 2 Carbon black (average particle size 30 mμ) 2 parts Lan Latex L-502 (vinylidene chloride/acrylonitrile copolymer 50% aqueous dispersion, manufactured by Asahi Dow@) 4 parts 10% Gohsenol GL-05 aqueous solution 20 parts (as described above) Water 14 parts The composition with the above formulation was dispersed, applied, and applied in the same manner as in Example 1.
Dry.

Furthermore, a colored layer similar to that of Example 1 was provided on this layer to prepare a test piece of Example 2.

Recording was performed on this test piece in the same manner as in Example 1.

However, the laser power is 1. phase, scanning speed is 10.60
m/sec.

The exposed test piece was immersed in water and rubbed with a sponge to remove the unexposed portions, resulting in an image in which the exposed portions were black.

The density of the obtained image was measured using the above PDA-65 and was found to be 4.0 or more.

Comparative Example 2 The same composition as the heat-sensitive layer of Example 2 had a dry weight of 4.0
PET in the same manner as in Example 2 except that mg/d rtr was used.
A test piece of Comparative Example 2 was prepared by coating and drying on a film.

This test piece was exposed to light in the same manner as in Example 2.

However, the laser power is 1.8 m and the scanning speed is 5.65 m.
/sec, 7.06m/see, 10.60
It was conducted for three types of m/sec. The transmission density of the image area of these test pieces was measured in the same manner as in Example 2 and was found to be 4.0 or more.

Each of these test pieces was then developed in the same manner as in Example 2 to obtain an image in which the exposed areas were black.

When the transmission density of the obtained image was measured, the results were as shown in Table 1 below. From this, it can be seen that the scanning speed of 10.6Q is about half or less of the above Example 2, and the scanning speed of 5.65 is about the same as that of the above Example 2, so this Comparative Example 2 is It can be seen that approximately twice the exposure energy is required compared to No. 2.

(Hereinafter, the margin of this page) Table 1 Exposure was carried out from the support side using Example 3 (manufactured by Log Esc, an>f).

When this test piece was developed in the same manner as in Example 1, a clear black image was obtained. The transmission density of the image was measured in the same manner as in Example 1 and was found to be 4.0 or more.

Example 4 R-530 (carbon blank aqueous dispersion, solid content 39%, manufactured by Dainichiseika@) 5 parts Hytic E-4A (polyethylene aqueous dispersion, solid content 40%, manufactured by Toho Chemical) 5 parts C-5 ( Hydroxypropyl methylcellulose Shin-Etsu Chemical Co., Ltd. 10% aqueous solution 20 parts Water 10 parts The composition with the above formulation was dispersed for 3 minutes using an ultrasonic dispersion machine, applied and dried in the same manner as in Example 1 to obtain a test piece having a heat-sensitive layer. It was created.

Carbon blank (average particle size 30 nl) 5 parts Hydroxypropyl methylcellulose hexahydrophthalate 5 parts Methyl cellosolve 90 parts A coating solution prepared by dispersing the above composition using glass beads for 600 minutes was applied onto the above heat-sensitive layer and dried with a wire. The coating was applied so that the subsequent weight was 10 mH/dm.

This test piece was dried at 50° C. or lower to prepare a test piece of Example 4.

This test piece was wound around a rotating cylinder and rotated at high speed while recording was performed from the support side using an argon laser. The laser power at this time was 1.8W.

The scanning speed was 21.20 m/sec.

Next, this test piece was immersed in water and rubbed with a sponge to remove the unexposed areas and obtain a black image of the exposed areas.

Example 5 FX-4236 (26% solid content in water-dispersed carbon, manufactured by Toyo Ink @) 8 parts Corpolene Latex L-2000 (33% ionomer resin water dispersion, manufactured by Asahi Dow @) 12 parts 10% gelatin aqueous solution 20 parts A coating solution prepared by dispersing the composition according to the above formulation for 3 minutes using an ultrasonic disperser is applied and dried to prepare a test piece having a heat-sensitive layer.

Gelatin 10 parts Glyoxal 0.02 parts TB-530 (described above) 50 parts Water 60 parts A coating solution prepared by dispersing the composition according to the above formulation for 5 minutes using an ultrasonic disperser was dried with a wire bar on the heat-sensitive layer. Apply so that the weight after is 5mg/di.
Dry.

When this test piece was exposed and developed in the same manner as in Example 1, a clear black image was obtained.

Example 6 Albumin (Wako Pure Chemical Industries) 4 parts B-506 (carbon blank aqueous dispersion, solid content 39%, manufactured by Dainichiseika@) 5 parts Glycerin (manufactured by Kanto Kagaku) 4 parts water 10 parts The above composition A coating solution prepared by dispersing for 5 minutes using an ultrasonic disperser was applied and dried in the same manner as in Example 1 to prepare a test piece having a heat-sensitive layer.

Furthermore, a colored J shade similar to that of Example 1 was provided on this layer to obtain a test piece of Example 6.

Recording was performed on this test piece in the same manner as in Example 1.

However, the laser power is 1.8 and the scanning speed is 10.60 m.
/sec.

When this test piece was immersed in water and lightly rubbed with a sponge, the unexposed areas were removed and a black image of the exposed areas was obtained.

October 21, 1982

Claims (1)

[Scope of Claims] +1.1 An image forming material having a support, a heat-sensitive layer whose solubility in a developer decreases when heated, and a colored layer that is insoluble in the developer and permeates the developer, comprising: An image forming material characterized in that a heat-sensitive layer is provided closer to the support than the colored layer. (2) The image forming material according to claim 1, wherein the developer is water. (3) The image forming material according to claim 1, wherein the heat-sensitive layer contains a thermoplastic resin. (4) The image forming material according to claim 1, wherein the colored layer contains a carbon blank. (5) The image forming material according to claim 1, wherein the colored layer contains a water-softening polymer compound. (6) The image forming material according to claim 3, wherein the thermoplastic resin is an ionomer resin.