JPH11129609A - Ink jet image receiving body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize an ink jet image receiving body, which has an excellent ink absorbing performance and is lustrous and, at the same time, has a little stickiness by a method wherein an ink image receiving layer on one side of a support includes a copolymer having at least one specified monomer as its constitutional unit. SOLUTION: In a flask, 80 g of N-vinylformamide, 120 g of N-vinyl-2- pyrrolidone and 800 g of ion-exchanged water are prepared. Next, the mixed solution is heated and agitated while being displaced with nitrogen. After the nitrogen displacement for 30 min or longer, when the mixed solution reaches 70 deg.C, its polymerization is initiated by charging 2 g of 2,2-azobisdihydrochlodie. After that, through the polymerization for three hours at 80 deg.C, a N- vinylformamide-N-vinyl-2-pyrrolidone copolymer is obtained. After the copolymer is diluted with the ion-exchanged water to 10% solids concentration, a fluorine- based surfactant is added to the copolymer so as to realize 0.01% of solids concentration in order to obtain a coating solution. By applying the coating solution on a resin covered paper and then drying the coating solution, an ink jet image receiving body is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image receiving member used for a printer or a plotter utilizing an ink jet recording method, and particularly to an ink jet recording material having a photographic paper-like gloss of a photograph which is highly demanded in color recording. The present invention relates to a highly transparent image receiver that can be used as an image receiver or an OHP sheet. In particular, it corresponds to an ink jet recording system using a pigment as a coloring material.

[0002]

2. Description of the Related Art In an ink jet recording system, fine droplets of ink are caused to fly by various operating principles and adhere to an image receiving body such as paper to record images and characters. Inkjet printers and inkjet plotters have features such as excellent high-speed printability and low noise, great flexibility in recording patterns, and no need for development-fixing, and can form complex images accurately and quickly. Attention is paid to the point. Especially as a hard copy production device for image information such as characters and various figures produced by computer,
In various applications, it has rapidly spread in recent years. Further, by using a plurality of ink nozzles, it is easy to perform multicolor recording. The color image formed by the multi-color ink jet method can obtain a record comparable to multi-color printing by the plate making method and printing by the color photographic method, and in applications where the number of copies is small, It is being widely applied because it is less expensive than printing and photographic techniques.

In recent years, ink jet printers and the like which can output a high-definition image comparable to a silver halide photograph image are commercially available at low cost. Ink-jet receivers are very inexpensive, while obtaining images of the same quality as the silver halide photographic method, so they are frequently used to replace display images on illuminated signs and product samples that require large-area images. Has significant economic benefits for the elderly. In addition, it has been impossible with conventional silver halide photography to create an image on a personal computer, which has recently become popular, and correct the color scheme and layout while looking at the printout. Then, there is an advantage that such an operation can be easily performed.

In particular, recent advances in high-performance personal ink jet printers have been remarkable, and in order to solve the drawbacks of ink jet printers such as image graininess and poor gradation, a plurality of low-density inks are placed at the same position. A method of improving the gradation by repetitive driving, and a reduction in the granularity and an improvement in the gradation by using a combination of inks having a high color material density and a low ink concentration are attempted. Further, the printing speed has been improved, and the amount of ink to be ejected has been increased.

In addition, following the spread of ink jet printers as output devices for personal computers, inexpensive and high-performance image input devices have recently begun to spread. For example, various scanners such as flat head scanners and film scanners, and digital cameras have become widespread. In particular, in recent years, inexpensive and high-performance digital cameras have appeared one after another, and are exploding. With the spread of these input devices, image input (digital camera etc.)-image processing (PC)-image output (inkjet printer) can be done easily.

[0006] As a field of application of ink jet printers and plotters, and in the printing field where image quality close to that of photographs is required, production of color plates, recording of full-color images such as output of design images in the design department, etc. The image information created in step (1) is recorded on a transparent image receiving body by an ink jet printer, and is used by an OHP (overhead projector) for a conference presentation or the like.

[0007] As described above, the demands from the field of application of ink jet printers and plotters and the spread of ink jet printers and plotters have led to diversification of requests for recording materials, for example, having a glossy surface as high as silver halide color photographs. There has been a demand for an image receiver having excellent appearance aptitude, a highly transparent image receiver usable as an OHP sheet, and the like.

[0008] Dyes and pigments are used as coloring materials used in ink jet printers and plotter inks. Above all, inkjet plotters capable of large-format color output are used for outdoor displays with a small number of copies, and are used for output of posters and the like.As a coloring material, an ink using a pigment that is more light-resistant than a dye is used. There are many.

As the image receiving member used in the ink jet recording system, efforts have been made in terms of the apparatus and ink composition so that ordinary printing or high quality paper for writing or coated paper can be used. However, higher speed, higher definition,
Further, with the improvement of the performance of the ink jet recording apparatus such as full-color printing and the expansion of the application, more advanced characteristics are also required for the image receiving body. That is, the image receiving body has a high density of print dots, a bright and vivid color tone, a quick ink absorption, and even when the print dots overlap, the ink does not flow or bleed, and the print dots Is required not to be unnecessarily large in the lateral direction, and to be smooth and unsharp in the periphery. In particular, in the case of color recording, not only single-color recording of yellow, magenta, cyan, and black, but also multi-color recording in which these colors are superimposed is performed, and further strict performance is required because the ink adhesion amount is further increased. .

In the ink-jet recording system using a pigment as a coloring material, which has recently become widespread, the coloring material is present near the surface of the image receiving member without penetrating into the image receiving member. I do. Therefore, characteristics different from those of an ink jet recording type image receiving body using a dye as a coloring material are required.

[0011] Conventional ink jet image receiving members include, for example, JP-A-55-51583, JP-A-56-157, JP-A-57-107879, JP-A-57-107880, and JP-A-57-178880.
Nos. 9-230787, 62-160277, 62
184879, 62-183382, 64-
Japanese Patent No. 11877 discloses a recording material obtained by applying a silicon-containing pigment such as silica to a paper surface together with an aqueous binder, and pigment fine particles such as silica used in these examples are oil-absorbing. The amount is large, and the image receiving body using them generally reaches a certain level in terms of ink absorption capacity and absorption speed. However, since it is necessary to introduce a large amount of an inorganic pigment such as silica into the coating layer, there is a disadvantage that the surface gloss of the recording material itself is reduced. It is not preferable to use colloidal silica in place of silica for the purpose of improving glossiness, as described in JP-A-56-157, because it deteriorates the ink absorbency. Alternatively, JP-A-3-215082
As described in JP-A Nos. 4-67986 and 5-32037, a method for forming a transparent image receiving body by coating a fine alumina sol with a water-soluble binder on a support surface is known. However, if the ratio of alumina sol (pseudo boehmite) to the binder in the coating layer is not increased, there is a problem that the ink absorbency is inferior. Very easy to generate and the coating amount is 20g
If it is not more than about / m ^{2, the} ink absorption capacity is not sufficient, so that thick film coating is necessary. Further, since the coating strength is weak, the surface recorded by inkjet recording is rubbed, and the image is easily peeled off.In addition to various problems that curl is likely to occur after printing, the transparency of the coating film is poor. Therefore, there is a disadvantage that a glossy surface cannot be obtained even when a support having a high glossy surface is used. Also,
JP-A-6-320857 discloses a cast coated paper obtained by performing a cast finish while the coating layer is in a wet state as an ink jet image receiving member having a glossy surface. The surface gloss is extremely low as compared with the above, and the texture of silver halide photographs cannot be obtained.

On the other hand, in order to form an ink image-receiving layer having enhanced transparency and / or glossiness, the above-mentioned various inorganic pigments are not used, or the amount of addition is limited to a small amount even if they are used. Therefore, ink absorption is often left to the resin layer formed on the surface of the support. Examples of resins conventionally used in such applications include, for example, JP-A-57-3
Nos. 8185 and 62-184879, polyvinylpyrrolidone, vinylpyrrolidone-vinyl acetate copolymer, JP-A-60-168651, and JP-A-60-168651
Nos. 0-171143 and 61-134290, resin compositions containing polyvinyl alcohol as a main component, and vinyl alcohol and olefin or styrene and maleic anhydride described in JP-A-60-234879. Copolymers, crosslinked products of polyethylene oxide and isocyanate described in JP-A-61-74879, mixtures of carboxymethyl cellulose and polyethylene oxide described in JP-A-61-181679, JP-A-61-132377 No. 6,098,098, a polymer obtained by grafting methacrylamide to polyvinyl alcohol, an acrylic polymer having a carboxyl group described in JP-A-62-220383, and a polyvinyl acetal polymer described in JP-A-4-214382. JP 4-282282, the 4-
Various ink-absorbing polymers such as a crosslinkable acrylic polymer as described in JP-A-285650 have been proposed.

Further, since the surface of the printed portion is attacked by water in the ink, even if a support having a high gloss surface is used, it is not possible to avoid a decrease in the surface gloss of the printed portion. . The same applies to a case where the support is used for a transparent OHP. The surface of the printed portion is eroded and becomes cloudy, and the light transmittance is deteriorated.

Further, an ink jet image receiving member having a film made of poly N-vinyl formamide or a partial hydrolyzate thereof disclosed in JP-A-1-24784 is
In recent inkjet printers, which have a large amount of ejected ink and a high printing speed, the ink absorption speed and the ink absorption capacity are insufficient. Further, it is impossible to print at all with pigment ink.

[0015] As shown in JP-A-8-216502, an inkjet image receiver containing a polyvinylamine copolymer is effective as an ink fixing agent, but has insufficient ink absorbency by itself.

[0016]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an ink jet image receiving system which is excellent in ink absorption performance, glossy and less sticky in an ink jet recording system using a dye ink and / or a pigment ink. Especially in the ink jet recording system using pigment ink, the ink absorption performance is excellent, there is gloss,
An object of the present invention is to provide an ink-jet image receiver for a pigment ink having less stickiness.

It is an object of the present invention to provide an ink jet image receiving member having a photographic luster, which is particularly required for color recording, and an ink jet image receiving member suitable for a recording material having high transparency which can be used as an OHP sheet.

[0018]

The object of the present invention can be solved by the following method. That is, in an ink jet image receiving member provided with an ink image receiving layer on at least one surface of a support, the ink image receiving layer is formed of at least N-vinylformamide, N-vinyl-2-pyrrolidone, N, N-
Dimethylacrylamide, N, N-diethylacrylamide, N-vinyl-N-methylacetamide, N-isopropylacrylamide, acryloylmorpholine, N
-2-Hydroxyethyl methacrylamide, N-methylol methacrylamide, vinyl acetate, and a copolymer containing at least one selected from the group consisting of sodium styrenesulfonate as a constituent unit have excellent ink absorption performance and gloss. Thus, it was possible to provide an ink jet receiver having a low stickiness.

In the present invention, N-vinylformamide is soluble in various organic solvents such as alcohols, ethyl acetate, acetone, chloroform, methyl isobutyl ketone in addition to water. Further, the homopolymer of N-vinylformamide is water-soluble and has high copolymerizability, and can be copolymerized with other vinyl monomers such as acrylic monomers. By copolymerizing the above monomer group and N-vinylformamide, a copolymer excellent in inkjet suitability could be obtained.

In the present invention, the ink image-receiving layer is formed as described in
JP-A-24784 discloses an inkjet image receiver comprising poly N-vinylformamide or a partial hydrolyzate thereof, which is insufficient in performance with the current high-performance full-color inkjet printer. However, the ink image-receiving layer using the copolymer has a high ink speed and can provide an ink-jet image receiver that can sufficiently cope with a high-performance ink-jet printer with a large amount of ink.

In the present invention, N-
Depending on the content of vinylformamide and the selection and content of the monomer to be copolymerized, an ink containing a coloring material, water, a non-volatile organic solvent (ethylene glycol or glycerin) or the like could be rapidly absorbed. Further, although the reason is not clear, by containing N-vinylformamide, it was possible to obtain an ink jet image receiver having a glossy printed portion and a non-printed portion and a low stickiness.

In the present invention, the copolymer can be mixed with various binders by selecting a monomer. Further, it is possible to obtain an ink jet image receiver having excellent ink absorption performance, glossiness and low stickiness. it can.
Conversely, poly-N disclosed in JP-A-1-24784
-A polymer composed of vinylformamide or a partial hydrolyzate thereof has a limited binder that can be mixed, and even if the composition can be mixed with a composition close to the constitution of the copolymer, the homogeneity of the polymer blend and the copolymer is low. The copolymer is more excellent in inkjet suitability.

As a result of further intensive studies, we have found that, in addition to the dyes usually used for ink-jet recording colorants, the ink-jet image-receiving body also has good characteristics in the ink-jet recording method of pigment inks using pigments. It turned out to show.

When a pigment is used as a coloring material, when the ink image-receiving layer absorbs ink, the pigment does not penetrate to the inside of the ink image-receiving layer and remains near the surface. Conversely, when a dye that is soluble in the ink solvent is used for the colorant, the dye is carried along with the absorption and diffusion of the ink solvent and penetrates into the ink receiving layer.

At the moment when the pigment ink lands on the ink image receiving layer, separation of the pigment and the ink solvent occurs, and only the ink solvent is absorbed by the ink image receiving layer, and it is considered that the pigment remains on the surface of the ink image receiving layer and is fixed. For this reason, the pigment is deposited and fixed on the printing portion in a normal inkjet image receiving member, so that the gloss of the printing portion is lost even if the unprinted portion is glossy.

In the present invention, it is considered that by containing N-vinylformamide in the ink image receiving layer, the ink can be uniformly absorbed on the surface of the ink image receiving layer and the pigment can be fixed uniformly. Actually, when the solid printing was performed with the pigment ink, the optical reflection density was measured to show a uniform density distribution and gloss. Further, since the ink solvent and the like have almost the same components as in the case of the dye ink described above, an ink image receiving layer having excellent ink absorption performance and low stickiness can be obtained.

That is, in the present invention, the ink image-receiving layer comprises at least N-vinylformamide, N-vinyl-2-pyrrolidone, N, N-dimethylacrylamide, N, N-
Contain at least one selected from diethylacrylamide, N-vinyl-N-methylacetamide, N-isopropylacrylamide, acryloylmorpholine, N-2-hydroxyethylmethacrylamide, N-methylolmethacrylamide, vinyl acetate, and sodium styrenesulfonate. By containing a copolymer as a unit,
In an inkjet recording method using a pigment ink,
An ink jet receiver having excellent ink absorption performance, glossiness, and low stickiness was obtained.

In the present invention, by further incorporating gelatin in the ink image-receiving layer, it was possible to obtain an ink-jet image receiver having excellent ink-absorbing performance, glossiness and low stickiness.

Since the film of gelatin alone is swellable,
It has excellent ink absorption performance. Even if it absorbs ink, it only swells while maintaining its form, and does not dissolve due to the ink solvent, so that a glossy film is obtained on the printed portion. By blending with this gelatin, the ink absorption performance, gloss and stickiness were further improved. Probably because it contains N-vinylformamide as a copolymer, it is well mixed with gelatin and gives a uniform glossy film.

In the present invention, by containing the copolymer and gelatin in the ink image-receiving layer, an ink-jet image receiver having improved ink absorption performance, gloss and low stickiness even in the case of pigment ink can be obtained. I got it. This is thought to be due to a swellable gel film that is not attacked by the ink solvent.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to an ink jet image receiving member having an ink image receiving layer provided on at least one surface of a support, wherein the ink image receiving layer comprises at least N-vinylformamide, N-vinyl-2-pyrrolidone, N-dimethylacrylamide, N, N-diethylacrylamide, N
-Vinyl-N-methylacetamide, N-isopropylacrylamide, acryloylmorpholine, N-2-
Solves problems such as ink absorption performance, gloss and stickiness by containing a copolymer containing at least one selected from hydroxyethyl methacrylamide, N-methylol methacrylamide, vinyl acetate and sodium styrene sulfonate as constituent units. The present invention provides an ink-jet receiver for ink-jet recording.

In the present invention, the ink image receiving layer comprises at least N-vinylformamide and N-vinyl-2-pyrrolidone, N, N-dimethylacrylamide, N, N-diethylacrylamide, N-vinyl-N-methylacetamide, -Isopropyl acrylamide, acryloyl morpholine, N-2-hydroxyethyl methacrylamide, N-methylol methacrylamide, vinyl acetate, and a copolymer containing at least one selected from the group consisting of sodium styrene sulfonate are more preferable. Monomers include N-vinyl-2-pyrrolidone, N, N
-Dimethylacrylamide, N, N-diethylacrylamide.

In the present invention, the N-
The proportion of vinylformamide is preferably from 10 to 80% by weight, more preferably from 20 to 60% by weight. The ratio of the copolymer in the ink image receiving layer is 10 to 10%.
0% by weight, more preferably 30 to 100% by weight.

In the present invention, various methods can be used to obtain the copolymer. The copolymer can be obtained by a method capable of polymerizing a vinyl monomer such as a radical polymerization method, an anion polymerization method, and a cationic polymerization method. Among them, the radical polymerization method is preferable as a simple method.

In the present invention, as a solvent for polymerizing the copolymer, various solvents other than water can be used. For example, ethanol, methanol, alcohol solvents such as isopropyl alcohol, heptane, aliphatic hydrocarbon solvents such as hexane, toluene, aromatic solvents such as xylene,
It can be synthesized in various solvents such as ketone solvents such as methyl ethyl ketone.

In the present invention, when the copolymer is synthesized with a solvent other than water, it may take the form of a latex. Depending on the solvent used, various synthetic methods such as a dispersion polymerization method, an inverse emulsion polymerization method, and a suspension polymerization method can be used.

In the present invention, the copolymer may be in any form such as a general random copolymer, a graft copolymer, a block copolymer and the like, but is preferably a graft copolymer. When the copolymer is a graft copolymer, the N-vinylformamide component may constitute either a trunk component or a branch component. Further, as the monomer to be copolymerized, N-vinyl-2-pyrrolidone, N, N-dimethylacrylamide, N, N-diethylacrylamide and the like are more preferable.

In the present invention, various methods are conceivable for obtaining a graft copolymer of the copolymer. Usually, as a method for obtaining the graft copolymer, it can be obtained by various known methods, and the following methods are exemplified. As a chain transfer method, a graft polymerization method using a cerium salt as an initiator, a graft polymerization method using various redox initiators, or a graft polymerization method using a polymer having a functional group, a polymer having a double bond (macromonomer) or a mercapto group is used. A polymer containing, a polymer containing a perester group,
Examples thereof include a graft polymerization method using a polymer containing a diazo group, a polymer containing an azonitrile group, and a polymer containing a halogen group, an anion graft polymerization method, and a cation graft polymerization method.

In the present invention, a preferred method for obtaining a graft copolymer of the copolymer is a graft polymerization method using a polymer having a functional group, and the above-mentioned polymer having a double bond (macromonomer) or mercapto group A polymer containing, a polymer containing a perester group,
A graft polymerization method using a polymer containing a diazo group, a polymer containing an azonitrile group, a polymer containing a halogen group, an anion graft polymerization method, a cation graft polymerization method, or the like is preferably used.

In the present invention, the proportion of N-vinylformamide in the graft copolymer containing at least N-vinylformamide as a constituent unit is 10 to 80% by weight.
And more preferably 20 to 60% by weight. The proportion of the copolymer in the ink image receiving layer is preferably from 10 to 100% by weight. More preferably, it is 30 to 100% by weight.

In the present invention, by further containing gelatin in the ink image receiving layer, it is possible to obtain an image receiving body having more excellent ink jet suitability.

In the present invention, in order to obtain the ink image-receiving layer containing gelatin, the copolymer is preferably water-soluble. Further, the gelatin preferably has a composition ratio of 50% by weight or less based on the whole ink image receiving layer.

As the gelatin preferably used in the present invention, any gelatin can be used as long as it is made of animal insoluble collagen, but gelatin made of collagen obtained from pig skin, cow skin, cow bone or tendon is preferred. Further, the kind of gelatin is not particularly limited, but alkali (lime-treated) gelatin, acidic gelatin, those desalted by ion exchange, and phthalated gelatin can be used.

Among them, alkaline gelatin obtained from bovine bone or tendon has excellent ink absorbability. Among them, gelatin having few impurities extracted first at a low temperature during the production of gelatin is preferred. Clarified gelatin obtained by further removing high molecular weight impurities from the above-mentioned gelatin is more preferred.

In the present invention, when the ink image-receiving layer contains a gelatin component, the gelatin component is hardened as a method for increasing the water resistance of the ink image-receiving layer. As the hardening agent used for the hardening, various hardening agents used for hardening of gelatin for silver salt photography can be used. Examples of the organic hardener for hardening gelatin include the following.
Aldehyde hardeners, specifically formaldehyde, glyoxal, succinaldehyde, glutaraldehyde,
Dialdehyde starch, polyacrolein, N-methylol and acetal-based hardeners include condensates of ethylene glycol and glyoxal, condensates of succinaldehyde and ethanol, epoxy hardeners, aziridine hardeners, dichloro-S -Triazine hardener, mucohalic acid hardener, mucochloric acid, active halogen hardener acid halide type, benzyl halide type, acyl compound having halogen at carbon at α-position, active olefin hardener Vinyl sulfone type, acryloyl type, bismaleimide type, carbodiimide type hardener, isoxazolum type hardener, metasulfonic acid ester hardener,
Active ester hardeners, blocked polyfunctional isocyanates, and the like can be used.

Among them, epoxy hardeners and the like are preferable as hardeners, pot life, etc., and in addition, inexpensive, generally available and popular hardeners, and the following compounds can be preferably used. Sorbitol polyglycidyl ether, sorbitan polyglycidyl ether, polyglycerol polyglycidyl ether, diglycerol polyglycidyl ether, glycerol polyglycidyl ether, triglycidyl tris (2-hydroxyethyl) isocyanate, trimethylolpropane polyglycidyl ether, resorcin diglycidyl ether,
Neopentyl glycol diglycidyl ether, 1,6
-Hexanediol diglycidyl ether, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, polytetramethylene glycol diglycidyl ether, adipic acid diglycidyl ether, ortho-phthalic acid diglycidyl ether Glycidyl ether, hydroquinone diglycidyl ether, bisphenol S diglycidyl ether, terephthalic acid diglycidyl ether, dibromoneopentyl glycol diglycidyl ether, and the like. The addition amount of the epoxy hardener is preferably 0.2 to 5% by weight based on the gelatin in consideration of the ink absorbency and water resistance of the gelatin film. More preferably, 0.5
~ 3% by weight is good.

Further, an aziridine hardener can be preferably used because it has little pH dependency. The compounds are listed below.
Trimethylolpropane-tri-β-aziridinylpropionate, tetramethylolmethane-tri-β-aziridinylpropionate, N, N′-diphenylmethane-4,4′-bis (1-aziridinecarboxamide ),
N, N'-hexamethylene-1,6'-bis (1-aziridinecarboxamide), N, N'-toluene-2,4
'-Bis (1-aziridinecarboxamide), triethylenemelamine, bisisophthaloyl-1- (2-methylaziridine) and the like are preferably used. This aziridine-based hardener, like the epoxy-based hardener, takes into consideration the ink absorbency and water resistance of the gelatin film, and therefore, is added to gelatin in an amount of 0.1%.
2 to 8% by weight is preferred. More preferably, 0.5 to 5
% By weight is good.

Although there are many inorganic hardeners, polyvalent metal salts such as alum and chrome alum generally harden gelatin. It has long been known that gelatin containing dichromate is hardened by light, and this method can also be used.

In the present invention, when a coating solution containing a gelatin component is applied on a support to produce the coating solution, it is preferable that the coating solution is once gelled on the support and then dried. In order to produce by this production method, a step of gelling the gelatin component after application from a non-gelled coating liquid state is required. The coating solution should not gelatinize the gelatin component.
It is preferable that the temperature of the coating liquid is always kept at 30 ° C. or higher.
Next, after the coating solution is applied on the support, gelatin can be gelatinized by applying a cool air at 0 to 20 ° C. to gel the gelatin. Cold air temperature, humidity, air volume, process length, etc.
Alternatively, it varies depending on the application speed.

In the drying step following the gelling step, rapid drying at a high temperature is not preferable. Preferably, drying is performed while gradually increasing the temperature from the gelation step. This is because if the gel is rapidly dried at a high temperature, the gelatinized water-containing gelatin reaches a gelling temperature or higher before water evaporates, and becomes a sol.

In the present invention, the ink receiver obtained by gelling the gelatin component has a further improved ink quick-drying property, and further reduces the stickiness of the printed portion. Also,
It is preferable that the gelation temperature is lower. Cold air applied for gelatinizing gelatin is preferably 15 ° C. or lower, more preferably 10 ° C. or lower.

In the present invention, various monomer components other than the above monomers may be introduced into the copolymer. In addition to the above-mentioned monomers, tertiary amine compound monomers for dye fixing and quaternary ammonium salt compound monomers are preferably used. Further, a carboxylic acid-containing compound monomer, an acid anhydride-containing compound monomer, a hydroxyl group-containing compound monomer, or the like is preferably used as a crosslinking point.

In the present invention, the ink image-receiving layer may contain various materials other than the copolymer. Specifically, a water-soluble polymer for further improving the ink absorbency, for further reducing the stickiness, for improving the water resistance of the film, for latex particles used for blocking prevention, silica, alumina, styrene There are inorganic or organic pigments such as resin, and fine particles. Furthermore,
There are quaternary ammonium salt-containing compounds and amine-containing compounds for fixing the dye in the ink. It is also preferable to add various surfactants in order to improve the applicability during production.

In the present invention, examples of the water-soluble polymer that can be contained in the ink image-receiving layer include the following, but the present invention is not limited thereto.
Polyvinyl alcohol, polyethylene glycol, polypropylene glycol, polyacrylamide, polyacrylic acid, polyvinyl ether, polymaleic acid copolymer, polyethyleneimine, water-soluble alkyd, casein, glue, sodium alginate, gum arabic, tragacanth gum, dextran, pullulan, soluble starch ,
Carboxy starch, dextrin, British gum and the like can be mentioned. In addition, carboxyethylcellulose, carboxymethylcellulose, methylcellulose, methylcellulose, ethylcellulose, and hydroxyethylcellulose as components that absorb and retain non-volatile components that cause stickiness such as triethylene glycol and diethylene glycol contained in the ink to prevent clogging of the ink jet printer head. And hydroxymethylcellulose are also preferably used. Further, as a component for further improving the ink absorbency, the structural unit is N-vinyl-2-pyrrolidone, acrylamide, N, N-dimethylacrylamide, N, N-diethylacrylamide, N-vinyl-N-methylacetamide, N- A polymer containing at least one selected from the group consisting of isopropylacrylamide and acryloylmorpholine is also preferably used.

In the present invention, as the water-dispersed latex that can be contained in the ink image-receiving layer, various latexes can be used as long as they can be mixed with the copolymer, and the following can be mentioned. Styrene-butadiene latex,
Acrylate latex, vinyl acetate latex,
Latexes crosslinked and insolubilized and various latexes by soap-free polymerization are preferably used. these,
Latexes having a low glass transition temperature form a water-insoluble film at the time of coating and drying, and contribute to water resistance of the layer containing the copolymer. The addition amount is preferably 3 to 30% by weight based on the whole layer containing the copolymer. Further, the content is preferably 5 to 20% by weight.

Latex having a high glass transition temperature or crosslinked latex does not melt to form a film, and is therefore mainly used as an antiblocking agent.
As a preferable particle size of the latex, a particle size and an amount that do not decrease the glossiness or light transmittance of the entire ink image receiving layer can be introduced. Therefore, the preferred latex particle size is 0.1 to several tens of μm. More preferably, it is between 1 and 10 μm. The coating amount is preferably between 10 and 500 mg / m ² . Furthermore, 30
~150mg / m ² is preferred.

Various inorganic or organic pigments and fine particles for preventing blocking used in the present invention can be used. Large particle size colloidal silica, silica fine particles,
Examples include titanium oxide, zinc oxide, calcium carbonate, silicone fine particles, polystyrene fine particles, and polymethacrylate fine particles. These anti-blocking agents are preferably added to such an extent that the gloss and the transmittance of the image receiving body are not reduced. The particle diameter is preferably from 0.1 to 20 μm. More preferably, it is between 0.1 and 10 μm. The coating amount is preferably between 10 and 300 mg / m ² .
Furthermore, 30 to 150 mg / m ² is preferable.

In the present invention, the copolymer containing the copolymer
Dye fixing agents used by mixing in the ink image receiving layer include quaternary ammonium salt-containing compounds and amine-containing compounds.
As the cationic compound, various commercially available compounds can be used. In particular, oligomers and polymers containing a quaternary ammonium salt-containing compound or an amine-containing compound are preferably used. The following are specific examples of commercially available products. Nikkadyne 400 (Nikka Chemical Co., Ltd.)
Manufactured by Polyhooks 3000 (manufactured by Showa Polymer Co., Ltd.),
Polyhooks P601 (manufactured by Showa Polymer Co., Ltd.), Kofloc K-300 (manufactured by Showa Polymer Co., Ltd.), Sumireze Resin 636 (manufactured by Sumitomo Chemical Co., Ltd.), Sumireze Resin 639 (Sumitomo Chemical Co., Ltd.) Made), Sumireze resin 100
1 (manufactured by Sumitomo Chemical Co., Ltd.), Accurac 135 (manufactured by Mitsui Cytec Co., Ltd.), Accurac 202 (manufactured by Mitsui Cytec Co., Ltd.), Accurac 202A (manufactured by Mitsui Cytec Co., Ltd.), Accurac 205 ( And the like are preferably used.

As the surfactant used in the present invention, an anionic surfactant, a cationic surfactant, a nonionic surfactant, a betaine surfactant and the like are preferably used. Among them, a fluorine-based surfactant in which a fluorine compound is introduced into a hydrophobic group is more preferably used. The amount of addition is 0.0% with respect to the entire solid content of the ink image receiving layer.
0 to 1% by weight is preferred. More preferably, 0.0
It is preferably from 01 to 1% by weight.

In the present invention, as long as there is a layer containing the copolymer, the ink image-receiving layer may be laminated with other layers constituting the ink image-receiving layer.

As the support used in the present invention, various supports can be used as long as they are flexible and can be passed through a commercially available ink jet printer. For example, non-coated paper or coated paper of which size is adjusted, pulp, made of synthetic resin material, synthetic paper similar in appearance to paper, inorganic fiber paper made of glass fiber or ceramic fiber,
A nonwoven fabric, a transparent or colored resin sheet, or the like can be used.

However, among the supports preferably used in the present invention, when used as an ink-jet image receiving body for observing an image with reflected light, a white opaque support is preferred, and a color photographic paper such as a photographic paper is preferred. In order to obtain a texture of the resin, resin-coated paper or a white plastic film is preferably used. Since a high smoothness is required on the surface of the ink jet image receiver, a support having high smoothness is more preferable.

The support preferably used for observing an image with reflected light in the present invention is the above-mentioned white polyester film or resin-coated paper, but has the same texture (feeling feeling) as color printing paper. Suitable are resin coated papers which are the same support as the photographic paper. The basis weight of the resin-coated paper is preferably from 30 to 250 g / m ² . More preferably, it is 100 to 250 g / m ² .

The thickness of the coating resin layer of the resin-coated paper in the present invention is not particularly limited, but is generally coated to a thickness of 5 to 50 μm on only the front surface or both the front and back surfaces.

In the resin of the resin-coated paper of the present invention,
White pigments such as titanium oxide, zinc oxide, talc and calcium carbonate, fatty acid amides such as stearic acid amide and arachidic acid amide, fatty acid metal salts such as zinc stearate, calcium stearate, aluminum stearate and magnesium stearate, and antioxidants Blue pigments and dyes such as cobalt blue, ultramarine blue, cecilian blue and phthalocyanine blue, and various additives such as magenta pigments and dyes such as cobalt violet, fast violet and manganese violet, fluorescent brighteners and ultraviolet absorbers. They can be added in appropriate combinations.

The resin-coated paper support of the present invention may be provided with various back coat layers for an antistatic agent, a transport property, an anti-curl agent and the like. In the back coat layer, an inorganic antistatic agent, an organic antistatic agent, a hydrophilic binder, a latex, a curing agent, a pigment, a surfactant and the like can be appropriately combined and added.

Next, as a white plastic sheet, which is another suitable opaque support, those made of the following materials can be used. For example, polyester, polyolefin, polyamide, polyester amide, polyether, polyimide, polyamide imide, polystyrene, polycarbonate, poly-para-phenylene sulfide,
Polyetherester, polyvinyl chloride, poly (meth)
A film made of an acrylate ester or the like is preferable, and a copolymer, a blend, or a cross-linked film thereof can be used. More preferably, polyester is preferable, and among them, polyethylene terephthalate (hereinafter, PE) is preferable.
T) is excellent in terms of smoothness, dimensional stability, heat resistance, strength, high rigidity, chemical resistance, moisture resistance, moisture resistance and the like, and is very preferable.

As the opaque support, a white PET film obtained by kneading a white pigment such as titanium oxide, zinc oxide, talc, calcium carbonate or the like into the above PET film can be used. Further, a foamed PET film obtained by foaming and whitening a PET film can be used as a support.

The present invention also relates to a highly transparent ink-jet image receiver that can be used as an OHP sheet. Not only the composition, but also the properties of the support are important. Regarding the light transmittance when used as an OHP sheet, the haze (cloudiness value) is closer to the human sense than the total light transmittance, and the ink image receiving layer of the present invention can be used in JI.
By providing on at least one side of a transparent support having a haze (cloudiness value) of SK-7105 of 3.0 or less, it is possible to provide an inkjet image receiver having high transparency.

Further, the haze of the ink-jet image receiver when used as an OHP sheet is determined according to JIS-K-7105 of the haze of the ink-jet image receiver provided with an ink image-receiving layer on a support. Cloudiness) is preferably 5.0 or less.

The haze (haze value) can be expressed by the ratio of the diffuse transmittance and the total light transmittance measured using an integrating sphere light transmittance measuring device according to JIS-K-71.
05.

As the plastic sheet which is a suitable transparent support for OHP used in the present invention, various transparent sheets made of the same material as the white plastic sheet of the opaque support can be used. In addition, like the white plastic sheet, polyethylene terephthalate is very suitable in terms of the haze (haze value), and has smoothness, dimensional stability, heat resistance, strength, high rigidity, chemical resistance, moisture resistance and water resistance. Is also excellent and very preferable. OHP
The thickness of the support used in the image receiving body such as a sheet which is required to have a light-transmitting property is not particularly limited, but is preferably about 50 to 200 μm in view of the handling property and the suitability for paper passing of the printer.

The transparent support of the present invention may be provided with an anchor layer for the purpose of improving the adhesion between the ink image-receiving layer and the support. The anchor layer is a hydrophilic binder, a solvent-soluble binder such as butyral, a latex, a curing agent,
Pigments, surfactants and the like can be appropriately combined and added.

On the transparent support, various back coat layers may be coated within a range that does not increase haze (cloudiness value) for antistatic property, transport property, curl preventing property, writing property, gluing property and the like. Can be. In the back coat layer, an inorganic antistatic agent, an organic antistatic agent, a hydrophilic binder, a latex,
A curing agent, a pigment, a lubricant, a surfactant and the like can be added in an appropriate combination.

[0075]

Next, the present invention will be described in more detail with reference to Examples, but it should not be construed that the invention is limited thereto. Further,% and the like indicate weight%.

Synthesis of Copolymer <Copolymer A> 80 g of N-vinylformamide and 120 g of N-vinyl-2-pyrrolidone were placed in a 1 L four-necked flask.
g and 800 g of ion-exchanged water. Next, the mixed solution was heated and stirred while purging with nitrogen. 30 nitrogen substitutions
After more than one minute, when the temperature of the mixed solution reached 70 ° C., 2 g of 2,2′-azobis (2-methylpropionamidine) dihydrochloride was charged to initiate polymerization. afterwards,
Polymerized at 80 ° C. for 3 hours to obtain N-vinylformamide-N
-Vinyl-2-pyrrolidone copolymer was obtained,
And

<Copolymer B> N was placed in a 1 L four-necked flask.
-40 g of vinylformamide, 60 g of N, N-dimethylacrylamide, and 900 g of ion-exchanged water were charged. Next, the mixed solution was heated and stirred while purging with nitrogen. After performing the replacement with nitrogen for 30 minutes or more, the temperature of the mixed solution is reduced to 70
When the temperature reached ° C, 1 g of 2,2'-azobis (2-methylpropionamidine) dihydrochloride was added to initiate polymerization. Thereafter, polymerization was carried out at 80 ° C. for 3 hours to obtain an N-vinylformamide-N, N-dimethylacrylamide copolymer, which was designated as copolymer B.

<Copolymer C> N was added to a 1 L four-necked flask.
-30 g of vinylformamide, 60 g of N-vinyl-2-pyrrolidone, 10 g of acryloylmorpholine, and 900 g of ion-exchanged water were charged. Next, the mixed solution was heated and stirred while purging with nitrogen. After the replacement with nitrogen for 30 minutes or more, when the temperature of the mixed solution reaches 70 ° C., 1 g of 2,2′-azobis (2-methylpropionamidine) dihydrochloride is added.
It was charged to initiate polymerization. Thereafter, polymerization was carried out at 80 ° C. for 3 hours to obtain an N-vinylformamide-N-vinyl-2-pyrrolidone-acryloylmorpholine copolymer, which was designated as copolymer C.

<Copolymer D> N was placed in a 1 L four-necked flask.
-Vinylformamide 40 g, N-vinyl-2-pyrrolidone 30 g, N, N-dimethylacrylamide 20 g,
Acryloyl morpholine 10 g, ion exchange water 900
g. Next, the mixed solution was heated and stirred while purging with nitrogen. After the replacement with nitrogen for 30 minutes or more, when the temperature of the mixed solution reached 70 ° C., 1 g of 2,2′-azobis (2-methylpropionamidine) dihydrochloride was charged to initiate polymerization. Then, polymerize at 80 ° C for 3 hours,
An N-vinylformamide-N-vinyl-2-pyrrolidone-N, N-dimethylacrylamide-acryloylmorpholine copolymer was obtained and was referred to as Copolymer D.

<Copolymer E> N was placed in a 1 L four-necked flask.
-60 g of vinylformamide, 100 g of N-vinyl-2-pyrrolidone, 40 g of vinyl acetate, and 40 g of ion-exchanged water.
0 g and 400 g of ethanol were charged. Next, the mixed solution was heated and stirred while purging with nitrogen. 30 nitrogen substitutions
After more than one minute, when the temperature of the mixed solution reached 70 ° C., 2 g of 2,2′-azobis (2-methylpropionamidine) dihydrochloride was charged to initiate polymerization. afterwards,
Polymerized at 80 ° C. for 3 hours to obtain N-vinylformamide-N
A vinyl-2-pyrrolidone-vinyl acetate copolymer was obtained, and was referred to as copolymer E.

<Copolymer F> N was placed in a 1 L four-necked flask.
-200 g of vinylformamide, 800 g of ion-exchanged water
I charged. Next, the mixed solution was heated while purging with nitrogen,
Stirred. After the replacement with nitrogen for 30 minutes or more, when the temperature of the mixed solution reaches 70 ° C., 2,2′-azobis (2-
The polymerization was initiated by charging 2 g of methylpropionamidine) dihydrochloride. Thereafter, polymerization is carried out at 80 for 3 hours to obtain poly N
-Vinylformamide was obtained and was referred to as Copolymer F.

<Copolymer G> N was placed in a 1 L four-necked flask.
-200 g of vinylformamide, 800 g of ion-exchanged water
I charged. Next, the mixed solution was heated while purging with nitrogen,
Stirred. After the replacement with nitrogen for 30 minutes or more, when the temperature of the mixed solution reaches 70 ° C., 2,2′-azobis (2-
The polymerization was initiated by charging 2 g of methylpropionamidine) dihydrochloride. Thereafter, polymerization was carried out at 80 ° C. for 3 hours to obtain poly N-vinylformamide. Next, 190.8 g of a 35% hydrochloric acid aqueous solution (hydrochloric acid: 0.65 equivalent in terms of N-vinylformamide) was added, and the mixture was maintained at 75 ° C. for 9 hours with stirring to hydrolyze the polymer. The reaction solution was poured into a large amount of methanol, and the polymer was reprecipitated.
A 0% N-vinylformamide-vinylamine copolymer was obtained, and was designated as copolymer G.

<Copolymer H> N was added to a 1 L four-necked flask.
-Vinylformamide 50 g, acrylonitrile 50
g and 900 g of ion-exchanged water. Next, the mixed solution was heated and stirred while purging with nitrogen. 30 nitrogen substitutions
After more than one minute, when the temperature of the mixed solution reached 70 ° C., 1 g of 2,2′-azobis (2-methylpropionamidine) dihydrochloride was charged to initiate polymerization. afterwards,
Polymerization was performed at 80 ° C. for 3 hours to obtain an N-vinylformamide-acrylonitrile copolymer, which was designated as copolymer H.

<Copolymer I> N was added to a 1 L four-necked flask.
-Vinylformamide 50 g, acrylonitrile 50
g and 900 g of ion-exchanged water. Next, the mixed solution was heated and stirred while purging with nitrogen. 30 nitrogen substitutions
After more than one minute, when the temperature of the mixed solution reached 70 ° C., 1 g of 2,2′-azobis (2-methylpropionamidine) dihydrochloride was charged to initiate polymerization. afterwards,
Polymerization was performed at 80 ° C. for 3 hours to obtain poly (N-vinylformamide-acrylonitrile). Next, a 35% hydrochloric acid aqueous solution 1
47.7 g (hydrochloric acid: 0.3 equivalent to N-vinylformamide)
(65 equivalents), and the mixture was kept at 75 ° C. for 9 hours with stirring to hydrolyze the polymer. The reaction solution was poured into a large amount of acetone, and the polymer was reprecipitated to obtain an N-vinylformamide-acrylonitrile-vinylamine copolymer having a hydrolysis rate of 60%, which was designated as copolymer I.

Next, examples and comparative examples are shown below as ink-jet image receivers by forming an ink image-receiving layer on a support using the above-described synthesized copolymer and the like.

Example 1 Copolymer A was diluted with ion-exchanged water to a solid concentration of 10%, and a fluorine-based surfactant (Surflon 113 manufactured by Asahi Glass Co., Ltd.) was added at 0.01% based on the solid content. To obtain a coating solution. This coating liquid was applied on a resin-coated paper having a thickness of 200 μm, and then dried with a hot-air dryer at 70 ° C. to obtain an ink-jet image receptor having an application amount of 10 g / m ² .

Example 2 A coating amount of 10 g was obtained in the same manner as in Example 1 except that copolymer B was used in place of copolymer A in Example 1.
/ M ² of the ink jet receiver.

Example 3 A coating amount of 10 g was obtained in the same manner as in Example 1 except that Copolymer A was used in place of Copolymer A in Example 1.
/ M ² of the ink jet receiver.

Example 4 A coating amount of 10 g was obtained in the same manner as in Example 1 except that copolymer D was used in place of copolymer A in Example 1.
/ M ² of the ink jet receiver.

Example 5 Copolymer E was diluted to a solid concentration of 10% with a 1: 1 mixed solution of ion-exchanged water and ethanol, and a fluorine-based surfactant (Surflon 113 manufactured by Asahi Glass Co., Ltd.) was solidified. The solution was added so as to be 0.01% with respect to a minute to obtain a coating solution. After applying this coating liquid on a resin-coated paper having a thickness of 200 μm,
It was dried with a hot-air dryer at 0 ° C. to obtain an inkjet image receiver having a coating amount of 10 g / m ² .

Example 6 Copolymer A was diluted with ion-exchanged water to a solid concentration of 10%. Next, alkali method gelatin (viscosity 35 cp according to JIS method, jelly strength 275 bloom, pH 6.0)
1) 50 g was dispersed in 450 g of ion-exchanged water to swell gelatin for about 30 minutes. Thereafter, the dispersion was heated to 45 ° C. or higher to dissolve the gelatin, and a uniform solid concentration of 10% was obtained.
Was obtained. Copolymer A with a solid content of 10%
70 g and 30 g of the above gelatin solution were mixed, and a fluorine-based surfactant (Surflon 113 manufactured by Asahi Glass Co., Ltd.) was added so as to be 0.01% based on the solid content to prepare a coating solution. While heating this coating solution to 40 ° C.,
After coating on resin-coated paper of
The gelatin component was allowed to gel by applying for minutes. Then 20
C., 30.degree. C., 40.degree. C., and 50.degree. C., and slowly dried so that the gelatinization of the gelatin component does not occur.
/ M ² of the ink jet receiver.

Example 7 Copolymer A was diluted with ion-exchanged water to a solid concentration of 10%. Next, alkali method gelatin (viscosity 35 cp according to JIS method, jelly strength 275 bloom, pH 6.0)
1) 50 g was dispersed in 450 g of ion-exchanged water to swell gelatin for about 30 minutes. Thereafter, the dispersion was heated to 45 ° C. or higher to dissolve the gelatin, and a uniform solid concentration of 10% was obtained.
Was obtained. Copolymer A with a solid content of 10%
50 g of the above gelatin solution and 50 g of the above gelatin solution were mixed, and a fluorine-based surfactant (Surflon 113 manufactured by Asahi Glass Co., Ltd.) was added so as to be 0.01% based on the solid content to prepare a coating solution. While heating this coating solution to 40 ° C.,
After coating on resin-coated paper of
The gelatin component was allowed to gel for a minute. Then 20
C., 30.degree. C., 40.degree. C., and 50.degree. C., and slowly dried so that the gelatinization of the gelatin component does not occur.
/ M ² of the ink jet receiver.

Example 8 A coating amount of 10 g was obtained in the same manner as in Example 6 except that copolymer B was used instead of copolymer A in Example 6.
/ M ² of the ink jet receiver.

Example 9 A coating amount of 10 g was obtained in the same manner as in Example 6 except that Copolymer A was used instead of Copolymer A in Example 6.
/ M ² of the ink jet receiver.

Example 10 Copolymer A was diluted with ion-exchanged water to a solid concentration of 10% by weight. Next, 50 g of carboxymethylcellulose (Cellogen 6A, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) was stirred and dissolved in 450 g of ion-exchanged water to obtain an aqueous solution having a solid content of 10%. A mixture of 80 g of the copolymer A having a solid content of 10% and the above-mentioned 20 g of the carboxymethyl cellulose aqueous solution was mixed with a fluorinated surfactant (Surflon 113 manufactured by Asahi Glass Co., Ltd.).
Was added so as to be 0.01% based on the solid content to obtain a coating liquid. This coating liquid was applied on a resin-coated paper having a thickness of 200 μm, and then dried with a hot-air dryer at 70 ° C. to obtain an ink-jet image receptor having an application amount of 10 g / m ² .

Example 11 Copolymer A was diluted with ion-exchanged water to a solid concentration of 10% by weight. Next, polyvinyl alcohol (Kuraray Co., Ltd.)
Co., Ltd., 50 g of PVA117) was stirred and dissolved in 450 g of ion-exchanged water to obtain an aqueous solution having a solid content of 10%. 80 g of the copolymer A having a solid content of 10% and 20 g of the above-mentioned aqueous solution of polyvinyl alcohol were mixed, and the fluorine-based surfactant (Surflon 113 manufactured by Asahi Glass Co., Ltd.) was adjusted to 0.01% based on the solid content. It was added to make a coating solution. After applying this coating liquid on a resin-coated paper having a thickness of 200 μm,
It was dried with a hot-air dryer at 0 ° C. to obtain an inkjet image receiver having a coating amount of 10 g / m ² .

Example 12 Copolymer A was diluted with ion-exchanged water to a solid concentration of 10%, and a fluorinated surfactant (Surflon 113 manufactured by Asahi Glass Co., Ltd.) was added in an amount of 0.01% based on the solid content. To obtain a coating solution. This coating solution is coated with 100 μm thick transparent P
After coating on the ET support, with a hot air dryer at 70 ° C,
Drying was performed to obtain an ink jet image receiver for an OHP sheet having a coating amount of 10 g / m ² .

Example 13 Copolymer A was diluted with ion-exchanged water to a solid concentration of 10%. Next, alkali method gelatin (viscosity 35 cp according to JIS method, jelly strength 275 bloom, pH 6.0)
1) 50 g was dispersed in 450 g of ion-exchanged water to swell gelatin for about 30 minutes. Thereafter, the dispersion was heated to 45 ° C. or higher to dissolve the gelatin, and a uniform solid concentration of 10% was obtained.
Was obtained. Copolymer A with a solid content of 10%
70 g and 30 g of the above gelatin solution were mixed, and a fluorine-based surfactant (Surflon 113 manufactured by Asahi Glass Co., Ltd.) was added so as to be 0.01% based on the solid content to prepare a coating solution. While heating this coating solution to 40 ° C., the thickness is 100 μm.
After coating on a transparent PET support of No. 1, the gelatin component was gelled by applying cold air at 0 to 10 ° C. for about 1 minute. Thereafter, the gelatin component was dried slowly at 20 ° C., 30 ° C., 40 ° C., and 50 ° C. so as not to form a sol, thereby obtaining an inkjet receiver for an OHP sheet having a coating amount of 10 g / m ² .

Comparative Example 1 Copolymer F was diluted to a solid concentration of 10% with ion-exchanged water, and this coating solution was applied on a resin-coated paper having a thickness of 200 μm. Dry and apply 10g
/ M ² of the ink jet receiver.

Comparative Example 2 A coating amount of 10 g was obtained in the same manner as in Comparative Example 1 except that copolymer G was used instead of copolymer F in Comparative Example 1.
/ M ² of the ink jet receiver.

Comparative Example 3 A coating amount of 10 g was obtained in the same manner as in Comparative Example 1 except that copolymer H was used instead of copolymer F in Comparative Example 1.
/ M ² of the ink jet receiver.

Comparative Example 4 A coating amount of 10 g was obtained in the same manner as in Comparative Example 1, except that Copolymer I was used in place of Copolymer F in Comparative Example 1.
/ M ² of the ink jet receiver.

Comparative Example 5 Copolymer F was diluted with ion-exchanged water to a solid concentration of 10%. Polyvinyl alcohol (Kuraray Co., Ltd., PV
A117) was dissolved in ion-exchanged water to prepare a 10% aqueous solution. Next, a 10% aqueous solution of the copolymer F and a 10% aqueous solution of polyvinyl alcohol were mixed at a weight ratio of 5: 5 to obtain a coating liquid. This coating liquid was applied on a resin-coated paper having a thickness of 200 μm, and then dried with a hot-air dryer at 70 ° C. to obtain an ink-jet image receptor having an application amount of 10 g / m ² .

Comparative Example 6 A coating amount of 10 g was obtained in the same manner as in Comparative Example 5, except that Copolymer G was used instead of Copolymer F in Comparative Example 5.
/ M ² of the ink jet receiver.

Comparative Example 7 A coating amount of 10 g was obtained in the same manner as in Comparative Example 5 except that Copolymer I was used instead of Copolymer F in Comparative Example 5.
/ M ² of the ink jet receiver.

Comparative Example 8 Polyvinyl alcohol (manufactured by Kuraray Co., Ltd., PVA11)
7) was dissolved in ion-exchanged water to prepare a 10% aqueous solution. This is applied to a 200 μm thick resin-coated paper,
An ink-jet image receiver having an application amount of 10 g / m ² was obtained.

Comparative Example 9 Polyvinylpyrrolidone (K-90 manufactured by GAF) was dissolved in ion-exchanged water to prepare a 10% aqueous solution. this,
Apply to 200μm thick resin coated paper and apply 10g
/ M ² of the ink jet receiver.

Comparative Example 10 100 g of alkali-processed gelatin (viscosity 35 cp according to JIS method, jelly strength 275 bloom, pH 6.01) was dispersed in 900 g of ion-exchanged water to swell the gelatin for about 30 minutes. Thereafter, the dispersion was heated to 45 ° C. or higher to dissolve the gelatin to obtain a uniform gelatin solution. this,
Apply to 200μm thick resin coated paper and apply 10g
/ M ² of the ink jet receiver.

Comparative Example 11 A 1 L four-necked flask was charged with 200 g of vinyl acetate, 200 g of N-vinyl-2-pyrrolidone and 400 g of ethanol. Next, the mixed solution was heated and stirred while purging with nitrogen. After performing the replacement with nitrogen for 30 minutes or more, when the temperature of the mixed solution reaches 60 ° C., 2,2′-azobis (2,4
-Dimethylvaleronitrile) to initiate polymerization. Thereafter, polymerization was carried out for 6 hours to obtain a vinyl acetate-N-vinyl-2-pyrrolidone copolymer. Next, the above copolymer was diluted with ethanol to a solid content concentration of 20% to obtain a coating solution. This coating liquid was applied on a resin-coated paper having a thickness of 200 μm, and then dried with an explosion-proof hot-air drier to apply 10 g / m2 of coating liquid.
Ink-jet receivers of No. ² were obtained.

Comparative Example 12 Polyvinyl alcohol (PVA11, manufactured by Kuraray Co., Ltd.)
7) was dissolved in ion-exchanged water to prepare a 10% aqueous solution. Polyvinylpyrrolidone (K-90 manufactured by GAF) was dissolved in ion-exchanged water to prepare a 10% aqueous solution. 50 g of each of the two liquids was mixed to obtain a coating liquid. This coating liquid is applied to a resin-coated paper having a thickness of 200 μm and dried,
An ink-jet image receiver having an application amount of 10 g / m ² was obtained.

Comparative Example 13 An OHP having a coating amount of 10 g / m ² was prepared in the same manner as in Comparative Example 6, except that the support was changed to 100 μm transparent PET.
An ink jet receiver for a sheet was obtained.

Evaluation Next, printing evaluation and other evaluations were performed on the obtained ink-jet receiver. When the color material is a dye, the printing evaluation was performed using a high-performance photographic-quality inkjet printer using six-color ink, PM-700 manufactured by Seiko Epson Corporation.
C was performed. Print evaluation of pigment inks using pigments as coloring materials was made by Matrix manufactured by inkjet plotter GRAPHTEC Co., Ltd.
This was performed using sterJet JC2008-50 using GO ink (pigment ink). Both models have various patterns (yellow, magenta, cyan, black, blue,
Green and red mixed colors).

The evaluation method of the evaluation item and the definition of the evaluation result are as follows.

Image quality (ink absorption) Single color of each of yellow (Y), magenta (M), cyan (C) and black (BK) inks and their mixed colors R
(Red), G (Green), and B (Blue) visual judgment of the solid part. ：: Uniform solid with no 3K (300%, mixed color of Y, M, C) solid ink and no overflow. ：: Uniform solid without mixed ink (200%, R, G, B) solid with no ink deviation or overflow. There is no problem in practical use. Δ: Uniform solid (100%, Y, M, C, BK) solid without solid ink or overflow. However, in the mixed color portion, the ink overflows more. There is a practical problem. X: Solid color (100%, Y, M, C, BK) solid with ink shift or overflow. There is a practical problem.

Glossiness A variable-angle glossmeter (VGS-300A manufactured by Nippon Denshoku Industries Co., Ltd.)
Non-printed area and green (mixed color of Y and C) mixed color area (2
00%) was measured for specular gloss at an incident angle of 60 degrees and a light receiving angle of 60 degrees according to the specular gloss measurement method of JIS-Z-8741.

[0116] Stickiness After the oil content of the hand is thoroughly removed with soap, the surface of the unreceived ink jet receiver (white background) and the surface of the ink jet receiver after printing are removed.
The printed portion after a lapse of minutes was touched with a finger, and the stickiness was evaluated. ：: There is no sticky feeling in both the solid printing portion and the non-printing portion of 3K (300%, mixed color of Y, M and C). ：: Solid print portion and non-print portion of mixed color (200%, R, G, B) have no sticky feeling. There is no problem in practical use. Δ: There is no stickiness in the solid printed portion and non-printed portion of the single color (100%, Y, M, C, BK), but stickiness is felt in the mixed color portion. There is a practical problem. X: Solid color (100%, Y, M, C, BK) solid print area and non-print area have a sticky feeling. There is a problem in practice.

Haze (haze value): The haze (haze value) of a non-printed portion was measured by using a glossiness NDH-300A manufactured by Nippon Denshoku Industries Co., Ltd. in accordance with the method of JIS-K-7105. O
When used as an HP sheet, the haze of the unprinted portion is preferably 5.0 or less, and if it exceeds 5.0, the projected image becomes dark.

Table 1 shows the evaluation results of Examples 1 to 13 where the coloring material was a dye.

[0119]

[Table 1]

Table 2 shows the evaluation results of Comparative Examples 1 to 13 in which the coloring material was a dye.

[0121]

[Table 2]

Table 3 shows the evaluation results of Examples 1 to 11 in which the coloring material was a pigment.

[0123]

[Table 3]

Table 4 shows the evaluation results of Comparative Examples 1 to 12 in which the coloring material was a pigment.

[0125]

[Table 4]

In Comparative Examples 1 to 4, the ink was not absorbed at all, and a large amount of the ink was floating in the printing portion. Therefore, the gloss of the printing portion did not decrease much.

[0127]

As can be seen from the examples, the present invention is not suitable for an image receiving apparatus using a conventional polymer in an ink jet printer which has recently been required to have a high image quality and a high definition ink amount. Some problems such as ink absorption performance, gloss of a printing portion, and stickiness of a printing portion can be solved in a high-dimensional well-balanced manner. In addition, it is possible to provide an inkjet image receiver suitable for a recording material having high transparency and usable as an OHP sheet. In addition, ink-jet plotters that can produce large-format color output using pigment ink, which has recently become widespread, have high ink absorption performance, have a glossy print area, and have less sticky print area.
It is possible to provide an ink jet image receiver suitable for light-resistant poster output.

Claims (2)

[Claims] 1. An ink-jet image receiver having an ink image-receiving layer provided on at least one surface of a support, wherein the ink image-receiving layer is formed of at least N-vinylformamide, N-vinyl-2-pyrrolidone, N, N-dimethylacrylamide, N, N-diethylacrylamide, N-vinyl-N
-Contains a copolymer having at least one selected from the group consisting of methyl acetamide, N-isopropylacrylamide, acryloylmorpholine, N-2-hydroxyethyl methacrylamide, N-methylol methacrylamide, vinyl acetate, and sodium styrenesulfonate. An image receiving body for ink jet, characterized in that: 2. The ink jet image receiving body according to claim 1, wherein the ink image receiving layer further contains gelatin.