JP2000127609A - Ink-jet recording sheet and method for making record using the sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink-jet recording sheet which has good ink absorbing properties, can produce a quality ink-jet image, and exhibits good water resistance and preservation properties even when used outdoors and a method for making a record using the sheet. SOLUTION: In an ink-jet recording sheet in which at least one ink receiving layer is formed on a support, and its outermost layer substantially comprises thermoplastic organic polymer fine particles. Gurley permeability of JIS P8117 of the recording sheet is 55-5000 sec/100 ml. The support is a porous resin film comprising a thermoplastic resin containing paper containing wood pulp as a main component or inorganic fine particles, and the permeability of the support is 50-5000 sec/100 ml.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording sheet, and more particularly, to a method for forming a layer comprising thermoplastic organic polymer fine particles and coating the layer after ink jet recording to obtain water and light fastness. The present invention relates to an ink jet recording sheet from which a recorded matter having excellent properties can be obtained.

[0002]

2. Description of the Related Art Ink-jet recording is a method of recording images, characters, and the like by jetting fine droplets of ink on a recording sheet such as paper according to various operating principles. It has features such as easy multi-coloring, great flexibility in recording patterns, and no need for development-fixing, and is rapidly spreading in various applications as a recording device for various figures including Chinese characters and color images. In addition, an image formed by the multi-color ink jet method can obtain a record comparable to multi-color printing by a plate making method or printing by a color photographic method, and furthermore, the number of copies can be reduced. For applications that require less cost, the technology is being widely applied to the field of full-color image recording because it is cheaper than photographic technology.

As recording sheets used in the ink jet recording system, efforts have been made in terms of apparatuses and ink compositions in order to use high-quality paper and coated paper used for ordinary printing and writing. However, as the performance of the inkjet recording apparatus has been improved and the use thereof has been expanded, such as by increasing the speed and increasing the definition of the apparatus or by increasing the color, the recording sheet has been required to have higher properties. That is, the recording sheet has a high density of print dots, a bright and vivid color tone, quick absorption of ink, so that ink does not flow or bleed even when print dots overlap, That the diffusion in the direction is uniform and not excessively large, and that the periphery is smooth and not blurred, and that there is no change in image quality over time and the environment, for example, it is excellent in light resistance, water resistance, ozone resistance, etc. Required.

[0004] In response to such demands, several proposals have hitherto been made. In order to improve the ink absorption and prevent the diffusion of print dots, a method of providing an ink receiving layer on a support (JP-A-52-9074, JP-A-58-72495, etc.) Focusing on the fact that the distribution state of the dye component affects the color and sharpness, a method using a specific agent that adsorbs the dye component (JP-A-55-144)
No. 172). Also, light resistance, water resistance,
In order to improve ozone resistance, a basic oligomer is contained (Japanese Patent Application Laid-Open No. 60-11389), and a polyvinylamine copolymer is used in a substrate or in a coating layer on a substrate (Japanese Patent Application Laid-open No. No. 64-8085) and the like.

Further, after ink jet recording, a film is laminated on the surface, a clear resin layer is applied,
An attempt has been made to provide a layer of thermoplastic resin particles on the surface of the ink receiving layer in advance, and to obtain water resistance and gloss by melting the resin after inkjet recording (Japanese Patent Application Laid-Open No. Sho 59-2).
No. 01891, JP-A-62-183383, JP-A-01-18205
No. 5, JP-A No. 01-182081, JP-A No. 02-81663, and JP-A No. 07-237348).

[0006] Further, with the diversification of uses, it is used for posters and POP arts, or provided with an adhesive layer on the back surface, and used for price display labels, product display (bar code) labels, quality display labels, For label applications such as weighing display labels and advertising labels (stickers), it adheres well to a wide range of adherends, and because it is easy to apply, heat-sensitive properties, magnetic properties, Since it becomes possible to add a composite function by laminating a sheet or the like having suitability for offset printing, the application to tickets, commuter passes, various cards, and the like is expanding.

However, while the demands for these characteristics are gradually becoming higher and stricter, an ink jet recording apparatus is inexpensive and an image excellent in image reproducibility such as sharpness and color reproducibility and color reproducibility is obtained at a personal computer level. Because it can be easily obtained, the inkjet recording device has changed from a special recording device used for a specific person to a general-purpose recording device, and the image is comparable to printed matter and photograph Because of such quality, it is also being used as a postcard and a printer for digital photography. In this case, the texture and feel of postcards and photographic prints are required. Further, in applications used for large-size posters and the like, they are used outdoors, and are often exposed to the wind and rain or exposed to direct sunlight. Therefore, the ink jet recording sheet may be required to have the ability to withstand these environments.

[0008] Inks are classified into a solvent type and an aqueous type. However, there are many aqueous inks due to their price, safety, ease of handling, and the like. Important issues include prevention of ink bleeding that occurs when water adheres, and improvement of sheet waving due to the solvent reaching the base paper. However, at present it has not been sufficiently addressed to this problem, and in a recording sheet using a support mainly composed of wood pulp having a function as an ink absorber as a medium of an ink jet recording sheet, furthermore, It is an important and early problem to be solved.

[0009] The form of the ink jet recording sheet is a so-called plain paper type represented by so-called high quality paper and bond paper, and an ink receiving layer provided on a support such as paper such as high quality paper, synthetic paper and synthetic resin film. Coating type. In the coating type ink jet recording sheet, since the various characteristics of the ink receiving layer applied directly affect the print quality, selection of the specific surface area and shape of the pigment, absorption For the study of the transparency and refractive index of the pigment, etc., for the image quality, the coating layer structure and surface shape, etc. Various studies have been made on coating methods and the like.

[0010]

SUMMARY OF THE INVENTION The present invention relates to an ink-jet recording system which has good ink absorbability and provides an ink-jet image having excellent image quality. It is an object of the present invention to provide a good ink jet recording sheet and a method for producing a recorded material using the same.

[0011]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies in order to obtain a recorded matter having good water resistance and good outdoor storability as described above. As a result, an ink receiving layer was formed on a support. Further provided thereon a layer containing thermoplastic organic polymer fine particles, and after inkjet recording an ink jet recording sheet having a specific range of air permeability, the thermoplastic organic polymer fine particle layer is coated by heating or the like. Thus, the present invention was found to provide an ink jet recording sheet capable of achieving the above object, thereby completing the present invention.

That is, the ink jet recording sheet of the first invention is provided with one or more ink receiving layers on a support, and the outermost layer is substantially composed of thermoplastic organic polymer fine particles. Wherein the Gurley air permeability specified in JIS P8117 of the recording sheet is 55 to 5000 seconds / 100 ml.

An ink jet recording sheet wherein the support is a paper containing wood pulp as a main component or a porous resin film made of a thermoplastic resin containing inorganic fine particles, which satisfies the above range of air permeability. is there.

Further, the support has an air permeability of 50 to 5000.
This is an ink jet recording sheet for obtaining a recording sheet having the air permeability by using a material having a flow rate of second / 100 ml.

According to a second aspect of the present invention, the layer comprising the thermoplastic organic polymer fine particles is dissolved or melted on the inkjet recording sheet of the first invention after inkjet recording, and the thermoplastic organic polymer fine particles are fused. This is a method for producing a recorded matter, characterized in that a layer is formed.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an ink jet recording sheet of the present invention will be described in detail. The ink jet recording sheet of the present invention is provided with one or more ink receiving layers on a support, the outermost layer of which is substantially composed of thermoplastic organic polymer fine particles. The Gurley air permeability specified in P8117 is 55 to 5000 seconds / 100 ml. Gurley air permeability 80-4000 sec / 100
ml, and a Gurley air permeability of 150 to
More preferably, the ratio is 3000 seconds / 100 ml. A recording sheet having a Gurley air permeability of less than 55 seconds / 100 ml has poor image storability and a Gurley air permeability of 5000
When the recording sheet exceeds 100 ml / sec, there is no way to escape the expansion of air which is present in the ink-receiving layer or the support when the film is formed with the thermoplastic organic polymer fine particles after image recording, and bubbles are generated. It is not preferable because the image surface is roughened due to a hole or a hole.

The support used in the practice of the present invention has a Gurley air permeability specified in JIS P8117 of 50 to 5000 sec / 100 ml. It can be.

When a paper containing wood pulp as a main component is used as the support of the present invention, the means for obtaining a paper having a Gurley air permeability of 50 to 5000 sec / 100 ml as defined in JISP8117 is as follows. There is a method by changing the void structure of paper.

This method is to select pulp which is easy to make denser paper, select conditions for beating pulp, add polymer to stock slurry, use a multi-stage wet press, apply coating in the middle. Applying a surface sizing agent or a water-soluble polymer in an apparatus, or passing through a machine calender after papermaking, etc., to reduce the gap of paper by adjusting various papermaking conditions, one of the objects of the present invention is achieved. Is the way.

The Gurley air permeability of the present invention is 50 to 5000.
In order to obtain a paper support at a rate of 100 ml / sec, it is preferable to achieve the object by the following method, preferably by combining two or more of the following methods. The present inventors have made it clear.

(1) Wood pulp may be chlorine, hypochlorite, chlorine dioxide bleaching ordinary bleaching treatment, alkali extraction or alkali treatment and, if necessary, oxidation bleaching treatment with hydrogen peroxide, oxygen, etc. Wood pulp of softwood pulp, hardwood pulp, softwood hardwood mixed pulp that has been subjected to a combination treatment thereof, and
In addition, various kinds of kraft pulp, sulfite pulp, soda pulp and the like, and further, used paper pulp and the like can be used. Of these pulp, hardwood pulp which is easy to form with short fibers is frequently used, and specifically, hardwood pulp is used in an amount of 60% by weight or more, preferably 75% by weight or more,
It is advantageous to beat it with a beater so as to reduce the long fiber content as much as possible, or to mix and use waste paper pulp having a short fiber length.

(2) The paper support used in the practice of the present invention contains various additives during preparation of the stock slurry. As a sizing agent, fatty acid metal salts or fatty acids,
The addition of a relatively large amount of an alkyl ketene dimer emulsion or an epoxidized higher fatty acid amide, an alkenyl or alkyl succinic anhydride emulsion, a rosin derivative or the like alone or in combination may increase the Gurley air permeability of the present invention to 50.
This is advantageous for obtaining paper of ０００5000 sec / 100 ml. Others, anionic, cationic or amphoteric polyacrylamide, polyvinyl alcohol, cationized starch, vegetable galactomannan, etc. as a dry paper strength enhancer, polyamine polyamide epichlorohydrin resin, etc. as a wet paper strength enhancer, clay as a filler, clay , Kaolin, calcium carbonate, titanium oxide, etc .; water-soluble aluminum salts such as aluminum chloride and bansulfate as fixing agents; caustic soda, sodium carbonate, sulfuric acid, etc. as pH regulators; other coloring pigments, coloring dyes, fluorescent It is more advantageous to incorporate a whitening agent or the like in an appropriate combination.

(3) In a paper support or on a paper support,
It contains or coats various surface sizing agents, water-soluble polymers, hydrophilic colloids or polymer latexes. Specifically, various surface sizing agents, water-soluble polymers or hydrophilic colloids or polymer latexes are solidified in or on the base paper by size press or tab size press, blade coating, air knife coating, etc. It is preferable that the coating amount is 1.0 g / m ² or more or the coating amount is applied.

(4) The paper support is subjected to calendering using a machine calender, a super calender, a heat calender or the like after papermaking.

The thickness of the paper support used in the practice of the present invention is not particularly limited, but its basis weight is 40 to 30.
It can be appropriately selected within a range of 0 g / m ² . Preferably it is 80-280 g / m < ² >, More preferably, it is 100-2.
It is in the range of 50 g / m ² .

As the support of the present invention, JIS P811
Gurley air permeability specified in 7 is 50-5000 sec / 1
The porous resin film made of a thermoplastic resin containing inorganic fine particles of 00 ml is as follows.

The inorganic fine particles include amorphous silica, alumina, aluminum silicate, magnesium silicate, magnesium carbonate, light calcium carbonate, heavy calcium carbonate,
Examples include kaolin, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, zinc carbonate, satin white, diatomaceous earth, calcium silicate, aluminum hydroxide, lithopone, zeolite, hydrohaloysite, and magnesium hydroxide. Preferably, the particle diameter is 0.1 to 10 μm. If necessary, a heat stabilizer, an antistatic agent, an antioxidant, an ultraviolet absorber, a dispersant, a release agent and the like can be added.

Examples of the thermoplastic resin include polyolefins such as polyethylene and polypropylene, polyvinyl chloride, polyvinylidene chloride, polystyrene, styrene / butadiene / acrylonitrile copolymer, polyamides such as nylon, and polyesters such as polycarbonate and polyethylene phthalate. And copolyesters and polyesteramides, and these can be used as a mixture. Among these, polyolefins and polyesters are preferably used.

The porous resin film has a Gurley air permeability by stretching a thermoplastic resin film containing inorganic fine particles such as silica in a uniaxial or biaxial direction at a temperature lower than the melting point of the thermoplastic resin. It is a porous film of 50 to 5000 seconds / 100 ml. At this time, the Gurley air permeability can be adjusted by adjusting the particle size and filling amount of the inorganic fine particles, and further selecting the stretching ratio, the melting point of the thermoplastic resin, and the like.

In the ink jet recording sheet of the present invention, an ink receiving layer is provided on the paper support or the porous resin film. The ink receiving layer referred to in the present invention is mainly composed of inorganic or organic fine particles and a binder constituting a void for penetrating, transmitting, or adsorbing, absorbing or retaining a solvent or a coloring material in the ink. Refers to the layer. Further, when the ink receiving layer is a single layer, the layer is substantially formed, and when the ink receiving layer is a multilayer, the outermost layer substantially comprises thermoplastic organic polymer fine particles and a binder.

As the inorganic or organic fine particles, various conventionally known pigments can be used. For example, silica (colloidal silica, amorphous silica), alumina or alumina hydrate (alumina sol, colloidal alumina, cationic aluminum oxide or hydrate thereof, pseudoboehmite, etc.), aluminum silicate, magnesium silicate, magnesium carbonate , Light calcium carbonate, heavy calcium carbonate, kaolin, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, zinc carbonate, satin white, diatomaceous earth, calcium silicate, aluminum hydroxide, lithopone, zeolite, water Examples thereof include inorganic pigments such as halloysite and magnesium hydroxide, and organic pigments such as styrene-based plastic pigment, acrylic-based plastic pigment, polyethylene, microcapsules, urea resin, and melamine resin.

Among these pigments, porous inorganic pigments are preferable, and examples thereof include porous synthetic amorphous silica, porous magnesium carbonate, and porous alumina. Particularly, porous synthetic amorphous silica having a large pore volume, Alternatively, porous alumina hydrate can be preferably used. Even if the inorganic pigment is non-porous, it can be used as the pigment for the ink receiving layer of the present invention by agglomerating at the time of coating liquid preparation, or further aggregating at the time of coating and drying to form a porous coated surface, There is no problem in using these together.

As the binder, for example, polyvinyl alcohol, vinyl acetate, oxidized starch, etherified starch,
Cellulose derivatives such as carboxymethylcellulose and hydroxyethylcellulose, casein, gelatin, soy protein, silyl-modified polyvinyl alcohol, etc .; conjugated diene copolymers such as maleic anhydride resin, styrene-butadiene copolymer, methyl methacrylate-butadiene copolymer Latex; acrylic polymer latex such as polymer or copolymer of acrylic acid ester and methacrylic acid ester, polymer or copolymer of acrylic acid and methacrylic acid; vinyl polymer latex such as ethylene vinyl acetate copolymer Or a functional group-modified polymer latex with a functional group-containing monomer such as a carboxyl group of these various polymers; an aqueous binder such as a thermosetting synthetic resin system such as a melamine resin or a urea resin; a polymethyl methacrylate, a polyurethane resin; Unfortunate Sum polyester resin, vinyl chloride -
Synthetic resin binders such as vinyl acetate copolymer, polyvinyl butyral, and alkyd resin can be mentioned, and at least one kind can be used. or,
A cationic resin to be added for fixing a conventionally known dye can also be used in combination.

The total amount of the binder can be appropriately adjusted according to the intended properties of the ink-jet recording sheet.
６０60% by weight. Further, as other additives, a pigment dispersant, a thickener, a fluidity improver, an antifoaming agent, a foam inhibitor, a release agent, a foaming agent, a penetrant, a coloring dye, a coloring pigment, a fluorescent brightening agent, An ultraviolet absorber, an antioxidant, an antiseptic, an antibacterial agent, a waterproofing agent, a wet paper strength enhancer, a dry paper strength enhancer, and the like can be appropriately blended.

The composition of the thermoplastic organic polymer fine particles usable in the present invention includes, for example, polymonovinylidene aromatics such as polystyrene, polymethylstyrene, polymethoxystyrene, and polychlorostyrene, polyvinyl chloride, polyvinyl-cyclohexane, and polyethylene. , Polypropylene, polyolefins such as polyvinylidene chloride and polyhaloolefins, polymers of esters of α, β-ethylenically unsaturated acids such as polymethacrylate, polychloroacrylate, polymethyl methacrylate, etc., and copolymers thereof, etc. Is mentioned.

The thermoplastic organic high-molecular fine particles are prepared by, for example, preparing a slurry-like plastic pigment or latex, which is obtained by emulsion polymerization from one or more vinyl monomers, or a dried or solid plastic thereof by various means. It can be obtained as a crushed fine powder or a powder molded into fine particles. The size of these thermoplastic organic polymer fine particles is usually preferably 0.01 μm to 50 μm in diameter. If the diameter is smaller than 0.01 μm, the formed voids become too small, and the absorption of ink is unfavorably reduced. On the other hand, if it is larger than 50 μm, particles occupying an area larger than the ink dots are present on the surface, and the image quality is undesirably deteriorated.

The layer comprising the outermost layer of substantially thermoplastic organic polymer fine particles to the binder is a coating amount (dry ^{solids), 0.5g / m 2 ~50g /} m 2 is preferred. Also in the case of providing a separate ink-receiving layer under the layer, the coating amount as the (dry ^{solids), 0.5g / m 2 ~50g /} m 2 is preferred.

When these ink receiving layers are provided on the support, a recording sheet having excellent ink absorbency and capable of recording a fine recording image can be obtained.

As a method of applying the ink receiving layer, various blade coaters, roll coaters, air knife coaters, bar coaters, rod coaters, gate roll coaters,
Various apparatuses such as a curtain coater, a short dwell coater, a gravure coater, a flexographic gravure coater, a size press, and a slide hopper system can be used on-machine or off-machine.

After the coating, finishing may be performed by using a calendar such as a machine calendar, a heat calendar, a super calendar, or a soft calendar.

On the surface of the support opposite to the side on which the ink receiving layer is provided, various back coat layers are coated for antistatic properties, transport properties, curl preventing properties, writing properties, gluing properties, and the like. can do. An inorganic antistatic agent, an organic antistatic agent, a hydrophilic binder, a latex, a curing agent, a pigment, a lubricant, a matting agent, a surfactant and the like can be added to the back coat layer in an appropriate combination.

The ink used in the present invention includes the following colorants:
This is a recording liquid composed of a liquid medium and other additives. Examples of the colorant include water-soluble dyes such as direct dyes, acid dyes, basic dyes, reactive dyes, and food dyes, disperse dyes, color pigments, and carbon black.

As a solvent for the ink, water and various water-soluble organic solvents such as methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol, t
C1-C4 alkyl alcohols such as ert-butyl alcohol and isobutyl alcohol; amides such as dimethylformamide and dimethylacetamide; acetone;
Ketones or ketone alcohols such as diacetone alcohol; ethers such as tetrahydrofuran and dioxane;
Polyalkylene glycols such as polyethylene glycol and polypropylene glycol; ethylene glycol;
Alkylene glycols having 2 to 6 alkylene groups such as propylene glycol, butylene glycol, triethylene glycol, 1,2,6-hexanetriol, thiodiglycol, hexylene glycol, diethylene glycol; glycerin, ethylene glycol methyl ether, diethylene glycol Lower alkyl ethers of polyhydric alcohols such as methyl (or ethyl) ether, triethylene glycol, and monomethyl ether are exemplified. Among these many water-soluble organic solvents, polyhydric alcohols such as diethylene glycol and lower alkyl ethers of polyhydric alcohols such as triethylene glycol monomethyl ether and triethylene glycol monoethyl ether are preferred. Other additives include, for example, p
Examples include an H regulator, a metal sequestering agent, a fungicide, a viscosity modifier, a surface tension regulator, a wetting agent, a surfactant, and a rust inhibitor.

The role of the outermost layer composed of the thermoplastic organic polymer fine particles in the present invention is to immediately absorb the ink that flies and adheres to the outermost layer, and transfer a part or all of the ink to the lower layer having a high ink holding power. After ink jet recording, a film is formed by an appropriate means to protect the recorded image from water and light.

In the ink jet recording sheet of the present invention, when characters and images are recorded with an ink jet recording apparatus, the image is whitish and not very clear because the ink receiving layer has voids. In the present invention, a step of dissolving or melting the thermoplastic organic polymer fine particles in the outermost layer to form a film by changing the water-resistant transparent layer after recording the ink jet recorded image is required.

As a method for forming a film on the outermost layer, there is a method in which a solvent of a thermoplastic organic polymer is applied and dissolved, or a method in which heat is applied to form a molten film. When applying heat, it is advantageous to apply a substance that lowers the softening point of the thermoplastic organic polymer, in particular, a plasticizer before heating and then heat the film to form a film.

Further, the addition of an ultraviolet absorber, an antioxidant, a release agent, a light stabilizer and the like, which are usually used for a thermoplastic organic polymer, can deteriorate the formed thermoplastic organic polymer film. To prevent and further improve the lightfastness of the dyes in the ink jet image.

In the present invention, as described above, after inkjet recording, a solvent is applied or heat is applied in order to coat the outermost layer. At this time, vaporizable substances and air existing in the ink receiving layer and the support expand. If these gases cannot escape to the back due to surface coating, they will lose their escape and become bubbles under the coated surface layer, degrading image quality. In addition, if the air permeability is too good, the above-mentioned problem disappears, but oxygen and the like that have passed through the support from the back side attack the color material of the ink jet recorded image,
Decreases the storage stability of the coloring material. In addition, moisture and the like are easily transmitted, causing bleeding of the image and the like, which also deteriorates the storability of the image.

[0049]

EXAMPLES The present invention will be described below with reference to examples of the present invention, but the present invention is not limited to these examples.
Further, “parts” and “%” shown in Examples are parts by weight and% by weight unless otherwise specified.

Examples 1 to 4 A mixed pulp composed of 85% by weight of hardwood bleached kraft pulp and 15% by weight of softwood bleached sulphite pulp was beaten to a beating degree of 320 CSF, and then cationized based on 100 parts by weight of the pulp. A stock slurry was prepared by adding 3 parts by weight of starch, 0.2 parts by weight of anionized polyacrylamide, 0.3 parts by weight of an alkyl ketene dimer emulsion (as a ketene dimer component), and 0.4 parts by weight of a polyamide epichlorohydrin resin. . Thereafter, the stock slurry is formed into a paper web by a fourdrinier paper machine, and then subjected to a three-stage wet press in a wet part, and then processed by a smoothing roll.
After a two-stage strain press was performed in the subsequent drying part, drying was performed. Thereafter, during the drying, the carboxy-modified polyvinyl alcohol solution was subjected to size press to adjust the solid content to 1.0 g / m ² (Example 1), 2.0 g / m ² (Example 2), and 5.0 g / m 2. ² (Example 3) 10.0 g / m
² (Example 4) The base paper was finally dried so that the moisture content of the base paper was 8% by weight with absolute dry moisture, machine calendered, and described in Table 1 having a basis weight of 150 g / m ^2. A support for an ink jet recording sheet having Gurley air permeability was produced.

Comparative Example 1 In Example 1, except that the size press was not performed,
In the same manner as in Example 1, the support of Comparative Example 1 having the Gurley air permeability described in Table 1 was produced.

Examples 5 to 8 Gurley air permeability shown in Table 1 was obtained by using calcium carbonate as an inorganic filler, changing the particle size and the amount of the filler, and adjusting the stretching ratio (length × width). Having a biaxially oriented porous film of polypropylene film (thickness 1
50 μm) to obtain a support. The support of Example 5 had a particle size of 8 μm, a filling amount of 60%, and a draw ratio (1 × 9). The support of Example 6 had a particle size of 3 μm, a fill amount of 60%, and a draw ratio of (1 × 9). The support of No. 7 had a particle size of 1.3 μm, a filling amount of 60%, and a draw ratio (1 × 8). The support of Example 8 had a particle size of 0.8 μm, a fill amount of 60%, and a draw ratio of (1 × 8). there were.

Comparative Example 2 Calcium carbonate having a particle diameter of 0.8 μm was added as an inorganic filler.
0% by weight and a stretching ratio of 1 × 4 in length, a biaxially stretched polypropylene film (150 μm thick)
m) was used as support. The Gurley air permeability was infinite (∞).

[Preparation of Ink-Jet Recording Sheet] On the above support, 7 parts (solid content) of alumina sol AS-3 (manufactured by Catalyst Kasei Co., Ltd.) and polyvinyl alcohol MA-26 (manufactured by Shin-Etsu Chemical Co., Ltd.) were used as an ink receiving layer composition. ) 1 part (solid content)
And a coating liquid having a solid content of about 7%, comprising water, and coating with a bar coater to a dry coating amount of 15 g / m ² , followed by drying to form a first ink receiving layer. Next, 25 parts (solid content) of a polyolefin-based latex (Chemipearl M200: manufactured by Mitsui Chemicals, Inc.), which is an aqueous dispersion of thermoplastic organic polymer fine particles, and polyvinylpyrrolidone
0 parts of a coating solution having a solid content of about 30% was applied by a curtain coater to a dry coating amount of 5 g / m ² , and dried to prepare an ink jet recording sheet.

[Preparation of Inkjet Recorded Material] Solid printing of four primary colors and recording of a high-definition photographic image were performed on the obtained inkjet recording sheet using an inkjet printer (PM-750C) manufactured by Epson Corporation. , 1
Heating to 50 ° C. melted the outermost layer to form a film. The ink jet recording sheet and the recorded matter thus produced were evaluated by the following evaluation methods, and the results are shown in Table 1.

[Absorptivity of ink] The overflow and flow of ink at the portion where a high-resolution photographic image was drawn were visually evaluated. Those were marked as x.

[Image Quality of Recorded Image] The image quality of the recorded image is determined as follows.
◎ those that do not contain air bubbles at all, those that do not impair the image quality without air bubbles, etc., o that have some small air bubbles, and that have a somewhat rough image, include large air bubbles and holes, etc. An image whose image was not clearly seen was designated as x.
○ The above is good for image quality evaluation.

[Image preservation property] The preservation property of the recorded image is as follows.
A kW xenon lamp was irradiated for 60 hours from a distance of 30 cm, and the discoloration of the magenta solid printed portion due to light and air was measured. When the printing density was 70% or more as compared with that before irradiation, ◎, 50% or more and less than 70%, O: 20% or more and less than 50%, and X: less than 20%.
以上 The image storability is good.

[Image Water Resistance] The image water resistance is as follows. After the outermost layer is coated, the film is exposed to running water for 1 hour. Was evaluated as ○, the image was slightly blurred, Δ was determined, and the image was blurred or blurred, and was evaluated as ×. ○ The above shows good water resistance.

[0060]

[Table 1]

From the results shown in Table 1, it can be seen that in Examples of the present invention, images having good image quality, good storability and good water resistance can be obtained. In Comparative Example 1 in which the air permeability of the recording sheet was 33 seconds, the storage stability and water resistance were poor, and there was no air permeability. (∞) In Comparative Example 2, the layer of the thermoplastic organic polymer fine particles was coated. When this was done, holes were formed in the coating by air bubbles, the image quality deteriorated, and the preservability deteriorated extremely.

[0062]

As described above, according to the present invention, an ink jet recording sheet having good ink absorbability can obtain an ink jet image having excellent image quality, and has excellent water resistance and storage stability even when used outdoors. A record is obtained.

Continued on the front page F term (reference) 2H086 BA02 BA16 BA19 BA21 BA31 BA34 BA41 4F100 AA00A AA00H AK01A AK01C AK21 AR00B AT00A BA03 BA07 BA10A BA10C DE01A DE01C DE01H DG10A DJ01A GB90 JB07 JB12 JB12 JB12 JD12

Claims (5)

[Claims] 1. An ink jet recording sheet comprising at least one ink receiving layer provided on a support, the outermost layer of which is substantially composed of fine particles of a thermoplastic organic polymer, specified in JIS P8117 of the recording sheet. Wherein the Gurley air permeability is 55 to 5000 seconds / 100 ml. 2. The ink jet recording sheet according to claim 1, wherein said support is a paper mainly composed of wood pulp. 3. The ink jet recording sheet according to claim 1, wherein the support is a porous resin film made of a thermoplastic resin containing inorganic fine particles. 4. The ink jet recording sheet according to claim 1, wherein the Gurley air permeability of the support specified in JIS P8117 is 50 to 5000 seconds / 100 ml. 5. The inkjet recording sheet according to claim 1, wherein after inkjet recording, the layer comprising the thermoplastic organic polymer fine particles is dissolved or melted, and the thermoplastic organic polymer fine particles are fused. A method for producing a recorded matter, characterized in that the recorded matter is a layer.