JP3392649B2 - Crimping postcard paper for inkjet recording - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an ink-jet recording method for recording information using an anionic ink.
The present invention relates to a pressure-sensitive postcard paper for inkjet recording, which has excellent performance such that the ink in the recording portion does not bleed out due to the influence of water drops or the like.

[0002]

2. Description of the Related Art Non-impact recording methods have been actively developed because of the advantage that no noise is generated during recording.
Among them, the technical progress of the inkjet recording method, which enables high-speed recording and is easy to colorize, is remarkable. The ink jet recording method is a recording method in which ink is ejected as a myriad of liquid droplets by various means to adhere to a recording sheet. In most cases, an anionic direct dye or an acid dye is used as the ink for inkjet recording because of easy maintenance of the print head.

The ink jet recording sheet is required to have various performances, one of which is water resistance. Specifically, it is required that the ink in the recorded area of characters and images will not elute due to the influence of water droplets, etc., and in order to solve this, there is a technology to impart water resistance by using a cationic substance in combination with the recording layer. Many have been proposed. The basic principle of all of these is that anionic ink for inkjet recording is made difficult to dissolve in water by a cationic substance.

For example, in JP-A-53-49113, it is preferred to use polyethyleneimine in combination.
No. 591 is to add a water-soluble metal salt to the surface,
In JP-A-56-84992, it is possible to use polyvinylpyridin bromide and polyethyleneimine in combination, and in JP-A-59-20696, it is possible to use dimethyldiallylammonium chloride in combination, and in JP-A-59-1981.
No. 86, a polyethylenimine organic acid salt may be used in combination.
No.) contains a specific basic oligomer,
JP-A-60-260377 (Japanese Patent Publication No. 5-61109)
No.) with a cationic colloidal silica, JP-A-60-49990 with a polyalkylenepolyamine dicyandiamide ammonium salt condensate, and JP-A-60-76386 with a specific polyethyleneimine. The combined use of a quaternary ammonium compound is disclosed in JP-A-63-49478 (JP-B-7-452).
57) containing a specific quaternary ammonium salt type polymer electrolyte, and JP-A-63-183873 (Japanese Patent Publication No. 7-57553) containing a specific polyvinyl alcohol and a water-proofing agent. JP-A-63-2
No. 74583 (Japanese Patent Publication No. 7-2429) contains a specific dialkanolamino-modified alkylene glycol derivative.
No. 92191) contains acrylamide, diallyldimethylammonium chloride and an acrylamide-diallyldimethylammonium chloride copolymer as a main monomer, and JP-A-6-92012 discloses a secondary amine reacted with epihalohydrin. It is described that each of them contains a cationic resin.

On the other hand, what is called a "pressure-bonded postcard", which is an alternative to an envelope, is being used in various fields for the purpose of reducing the mailing cost. As an example of this structure, a base paper coated with a removable pressure-sensitive adhesive that can be adhered by pressure is used, and after printing confidential information, it is folded into two or three folds and passed between pressure rolls. There is a method of manufacturing a postcard by gluing the confidential surfaces together and cutting into postcard-sized pieces. After receiving the postcard, the recipient peels off the confidential surface attached and reads the confidential information. After peeling, the device is designed so that it cannot be re-adhered by a normal method to ensure confidentiality.

Various methods have been proposed for this pressure-bonded postcard. For example, in JP-A-4-59395, an adhesive composition comprising, on at least a part of the surface of a base sheet, a non-peeling adhesive base and a fine particulate filler having an incompatibility with the adhesive base. There is a proposal of a sheet for information carrier, which is characterized in that the above layer is provided. In this proposal, the average particle size is 10m
A fine particulate filler comprising a combination of silica and another filler having a particle size of μm to 30 μm, preferably 1 to 20 μm, is 100 to 400, preferably 130 to 300, and more preferably 150 with respect to 100 parts by weight of the pressure-sensitive adhesive. By adding up to 250 parts by weight, the blocking resistance is improved, the silicone oil used during electrostatic recording is absorbed, and the decrease in adhesive strength is eliminated.

Further, in JP-A-7-18232, a pressure-sensitive adhesive made of latex is provided on at least a part of one side of a support sheet, and two or more kinds of pressure-sensitive adhesives having no affinity for the pressure-sensitive adhesive. An information carrier sheet provided with a layer of a pseudo-adhesive comprising a fine particle filler and a modified polyvinyl alcohol having an affinity for both the pressure-sensitive adhesive and the fine particle filler has been proposed.

These pressure-bonded postcard sheets were developed for an electrostatic recording type (electrophotographic type) printer, and all the practically used ones use the electrostatic recording type printer. Information is output. In the electrostatic recording method, characters and images made of toner are formed on the surface of the recording drum by using static electricity, and after this is transferred to the surface of the recording paper, it is passed between heating rolls and heat is applied to melt the resin contained in the toner. Then fix it on the paper. The heating roll continuously supplies silicone oil to its surface to prevent the toner from adhering to the roll.

The present inventors examined the water resistance of an image by performing recording by an ink jet recording method using an anionic ink on a pressure-sensitive postcard base paper which has been put into practical use corresponding to the above-mentioned electrostatic recording method. As a result, it was found that the ink bleeds due to the influence of water and the water resistance is significantly inferior. This is a fatal drawback for postcards that are likely to get wet during the delivery. Further, it has been found that there is another problem in that when printing is performed and then pressure is applied and peeling is performed again, the printed portion is transferred to one side of the paper surface to stain the paper surface, making it difficult to read characters.

The present inventors added the above-mentioned various substances for improving water resistance to the adhesive used for the base paper for pressure-bonded postcards for the purpose of solving these drawbacks, and made further studies. It was found that, depending on the type, the coating liquid gelled and coating was impossible, or even if coating was possible, the water resistance and light resistance were poor.

Although the cause of this is not well understood, the present inventors presumed that it was due to the following reason. In general ink jet recording paper, the ratio of the filler to the adhesive is increased in order to improve the ink holding property. On the other hand, in the pressure-bonded postcard paper, the ratio of the filler to the adhesive must be reduced in order to develop the adhesive force, so that the ink holding property is inevitably lowered. Further, an ink jet recording paper having improved water resistance usually uses an adhesive agent having no ionic property, such as starch or polyvinyl alcohol.
Therefore, even if a cationic substance is used in combination with the coating liquid containing these adhesive and filler as the main components, the coating liquid does not gel. However, since these adhesives do not have the property of adhering even under high pressure, they cannot be used as adhesives for pressure-bonded postcards. All of the adhesives for pressure-bonded postcards that are currently in practical use are mainly anionic ones, and when used in combination with a cationic water-proofing agent, the coating liquid will gel.

The present invention aims to solve these problems. Specifically, it has various properties as pressure-bonded postcard paper, that is, it does not cause blocking during storage of the paper, has good pressure-bonding strength, and can be peeled with an appropriate force after pressure-bonding to read confidential information. A pressure-bonded postcard that satisfies the basic required performance as a pressure-bonded postcard paper such as not being able to adhere, and has good water resistance of the image when inkjet recording is performed, and preferably does not transfer the image to another surface that has been peeled off. The challenge is to get paper.

[0013]

[Means for Solving the Problems] The inventors of the present invention changed their ideas and proceeded with a study using a paper having a constitution which has not existed in the past. Specifically, it is an idea that the above problems can be solved by providing a layer for fixing the ink below the adhesive layer for the pressure-bonded postcard formed on the outermost layer of the base paper. As a result of various investigations carried out by the present inventors based on this idea, it is possible to solve the above-mentioned problems by providing a cationic coating layer as an undercoat layer of an adhesive layer for pressure-sensitive postcards formed in the outermost layer. The inventors have found the present invention and completed the present invention.

That is, the present invention is characterized in that the outermost layer on at least one side of the base paper is an adhesive layer for pressure-sensitive postcards, and a cationic coating layer is formed below the adhesive layer. Is a pressure-sensitive postcard for inkjet recording.

Next, the present invention will be described in detail. The base paper used in the present invention is usually a bleached softwood kraft pulp (NBK).
P), hardwood bleached kraft pulp (LBKP), softwood bleached sulfite pulp (NBSP), and other papermaking pulps of 300 to 600 ml C.I. S. F. Beaten into clay, kaolin, calcium carbonate, titanium dioxide, and other fillers, starch, PVA, polyacryl amide, and other paper-strengthening agents, melamine resin, urea resin, polyamide epichlorohydrin, polyacrylamide, and other wet paper strength A known papermaking machine such as a cylinder paper machine or a Fourdrinier paper machine, by appropriately adding a strengthening agent, a rosin-based sizing agent, a sizing agent such as an alkylketene dimer-based sizing agent, a fluorescent whitening agent, a colored dye / pigment, and a fixing agent. Based on the usual method using a machine, usually 40-150g
It is manufactured by making paper at a rate of / m ² . Incidentally, the paper of the present invention, a size press, etc.
Coating with a paper strength enhancer or the like can also be appropriately performed. Further, a coating layer composed of a filler and a binder for improving smoothness may be provided on the surface.

The cationic coating layer of the present invention means a layer coated with the various cationic substances described above, and any known cationic substance can be used. That is, polyethyleneimine, water-soluble salts of metals, polyvinylpyridinium bromide, dimethyldiallylammonium chloride,
Polyethyleneimine organic acid salt, cationic colloidal silica, quaternary ammonium salt type polymer electrolyte, dialkanol amino-modified alkylene glycol derivative, acrylamide / diallyldimethylammonium chloride copolymer, obtained by reacting secondary amine with epihalohydrin Cationic resins, dicyandiamide-based cationic resins and the like, and one or more of them are used.

As a result of examination by the present inventors, it was found that among them, the cationic epihalohydrin type resin is excellent in the effect of exhibiting water resistance and also excellent in light resistance. As the cationic epihalohydrin-based resin used in the present invention, a cationic resin obtained by reacting polyamines and / or polyamides with epihalohydrin has excellent light resistance and can be preferably used.
For example, as polyamines, one or more of dimethylamine, diethylamine, dipropylamine, methylethylamine, methylpropylamine, methylbutylamine, methyloctylamine, methyllaurylamine, ethylenediamine, diethylenetriamine, polyethyleneimine, piperidine, pyrrole, carbazole, etc. As the polyamides, polyalkylenepolyamide obtained by dehydration condensation of polyalkylenepolyamine and dibasic carboxylic acid, polyamidepolyurea obtained by deammonification condensation of polyalkylenepolyamine and urea, N-vinylamide monomer, ethylene A quaternary salt or the like obtained by reacting a dimethylaminopropyl acrylamide copolymer with hydrochloric acid;
At least one kind of epichlorohydrin, epibromohydrin, epiiodohydrin, etc. is used as the epihalohydrin, and the epihalohydrin-based cationic resin is obtained by polymerization using a known means.

In addition, as a result of examination by the present inventors, it was also found that the cationic dicyandiamide resin is particularly excellent in the effect of exhibiting water resistance.

As a means for forming this cationic coating layer, a method of coating a wet paper on a paper machine using a size press device, a gate roll coater, a bill blade coater, or a base paper Later, air knife coater, gravure coater, blade coater, roll coater,
A coating method using a bar coater or the like can be adopted. The coating amount is usually 0.1 to 10 g / m ^{2 in} solid content, preferably ² to 4 g / m ² . If the coating amount is less than 0.1 g / m ² , the water resistance of the ink for ink jet recording is insufficient, and if it exceeds 10 g / m ² , no further effect can be expected and the cost becomes high. desirable.

Further, a filler may be used in combination with the cationic coating layer in order to improve the coloring property and resolution of an ink jet printer for printing or images, but silica having a large specific surface area is particularly preferable. When silica is used in a large amount, the coating liquid agglomerates and the water resistance of the ink is adversely affected. Therefore, 1 to 20 parts by weight is preferable with respect to 100 parts by weight of the cationic substance in solid parts by weight.

The adhesive used for the adhesive layer for pressure-bonded postcards formed on the outermost layer of at least one surface of the base paper is:
It does not adhere under normal conditions and has the property of adhering by applying high pressure.
Synthetic rubber such as NBR and SBR and acrylic latex can be mainly used, but natural rubber-based latex is preferable because of its excellent relative balance. The filler that can be added to the pressure-sensitive adhesive can be selected from known materials such as kaolin, talc, calcium carbonate, silica, aluminum hydroxide, grain pigment particles such as plastic pigment and wheat flour. These adhesives and fillers, grain starch particles, etc., and additives such as antiaging agents, UV absorbers, etc. are appropriately combined to prevent blocking during storage of the paper by a known method, good pressure bonding strength, and appropriate pressure after pressure bonding. It can be peeled off with force, confidential information can be read, and it has the performance that cannot be re-adhered by the usual method.

Next, the electrostatic recording type printer will be described in detail. Conventional pressure-sensitive postcards for electrostatic recording (electrophotographic) printers are porous and have a large specific surface area.
Silica, which has a large oil absorption, is used as a filler. The reason why silica is used in the adhesive layer of the pressure-bonded postcard paper is also to prevent blocking, but the other reason is to absorb silicone oil. Among electrophotographic printers, there is a heat roll fixing printer that fixes toner with a high heat (about 200 ° C.) heat roll. The heat roll, which is the fixing roll, is cleaned with silicone oil to prevent the adhesion of preprint ink and toner.However, if the silicone oil is transferred from the heat roll to the pressure-bonded postcard paper and remains on the adhesive surface, the adhesive force will increase. Is significantly reduced, which is a practical problem. For this reason, electrophotographic pressure-sensitive postcards for printers use silica, which is porous and has a large specific surface area and a large oil absorption amount, in order to absorb the silicone oil into the silica.

However, since the ink jet printer does not have such a step, it is not necessary to use silica which is porous and has a large specific surface area and a large oil absorption amount. Even if an adhesive layer containing such silica is formed on a cationic coating layer and printed with an inkjet printer, transfer of an image will occur if the adhesive layer is pressed and peeled off. The reason for this is not clear, but the present inventors presumed that this silica retains the ink because it is porous and has a large specific surface area, and the retained ink is easily released during pressure bonding.

The present inventors have made further studies to solve this drawback. Specifically, various fillers were used in combination with the adhesive to examine the transferability of the image. As a result, the specific surface area measured by the BET method is 10 to 100 m ² / g, and the JIS
Oil absorption measured according to K5101 is 100 ml /
It has been found that the above problems can be solved by using 100 g or less of silica as a filler for the adhesive. Furthermore, in this case, since it becomes possible to impede the film-forming property of the pressure-sensitive adhesive and dramatically lower the air permeability of the adhesive layer, the ratio of the water-soluble ink reaching the cationic coating layer Was found to increase, and the water resistance of the ink was also improved. It was also found that this silica has sufficient performance to prevent blocking. This silica is 30 to 300 parts by weight with respect to 100 parts by weight of the pressure sensitive adhesive in consideration of the balance of performance,
It is preferable to add 50 to 150 parts by weight.

The adhesive is coated by an air knife coater, a gravure coater, a blade coater, a roll coater,
A known coating method such as a bar coater can be used. Coating amount is 1-8 g / m ² by solid content, since preferably from penetrating passage of the ink for better thin adhesive layer is ink-jet recording, it is preferable that the 2-5 g / m ^2. Fillers that can be used as an auxiliary component together with the above silica include kaolin, talc, calcium carbonate, aluminum hydroxide,
A plastic pigment or the like can be used, and it can be appropriately selected and used from known materials.

Since the pressure-bonded postcard paper may be printed with a UV-curable ink in a form printing machine to form a foam before the characters and images are recorded by the printer, the pressure-bonded postcard paper of the present invention is used. When using a natural rubber-based adhesive, in order to prevent the decrease in adhesive strength due to deterioration of natural rubber,
UV absorbers and anti-aging agents can be used among the known materials.

Next, a constitutional example of the pressure-sensitive postcard paper for ink jet recording of the present invention will be explained. 1) A constitution in which a cationic coating layer is formed only on one side of a base paper, and an adhesive layer for pressure-sensitive postcards is formed thereon. 2) A constitution in which a cationic coating layer is formed on both sides of the base paper and an adhesive layer for pressure-sensitive postcards is formed on both sides thereof. 3) A constitution in which a cationic coating layer is formed on both sides of the base paper, and an adhesive layer for pressure-bonded postcards is formed on one side thereof. 4) A cationic coating layer is formed on both sides of the base paper, an adhesive layer for pressure-sensitive postcards is formed on one surface of the base paper, and an ink jet recording mainly composed of a filler and a binder is formed on the other surface. Configurations that form suitable layers.

The pressure-sensitive postcard paper for ink-jet recording of the present invention is manufactured as described above, various information is recorded by the ink-jet recording system, processed into a well-known postcard form, and delivered.

As the dye used in the ink for ink jet recording, for example, an anionic direct dye or an acid dye described in JP-A-57-191084 and JP-B-7-2429 is used. . Specifically, C.I. I (color index, same hereafter) 1468
0, C.I. I 16255, C.I. I 16150, C.I. I
45100, C.I. I 45380, C.I. I 4541
0, C.I. I 45440, C.I. I, C.I. I 2350
0, C.I. I 29165, C.I. I 29160, C.I. I
25380, C.I. I 45160, C.I. I 4807
0, C.I. I 48015, C.I. Red dyes such as C.I 17065, C.I. I 16240, C.I. I29150,
C. I 46005, C.I. I 46045, C.I. I 4
8035, C.I. An orange dye, such as I 48040,
C. I 10316, C.I. I 56205, C.I. I 1
8965, C.I. I 19140, C.I. I 22910,
C. I13900, C.I. I, C.I. I 13920, C.I.
I 25300, C.I. I 29020, C.I. I 290
25, C.I. I 49005, C.I. I 48055, C.I.
Yellow dyes such as I 41000, C.I. I 4402
5, C.I. I 34040, C.I. Green dyes such as I 42000, C.I. I 42090, C.I. I 4208
0, C.I. I 61125, C.I. I 50315, C.I. I
42660, C.I. I 15706, C.I. I 2441
0, C.I. I 24400, C.I. I 74180, C.I. I
42025, C.I. I 51005, C.I. I 4259
5, C.I. Blue dyes such as I44045, C.I. I 4
2535, C.I. I 42555, C.I. I 48020,
C. I 45170, C.I. Purple dyes such as I 42510, C.I. I 20470, C.I. I 50420,
C. I 26370, C.I. I27070, C.I. I 17
580, C.I. I 27700, C.I. I 35255,
C. I 35435, C.I. I 35440, C.I. I 3
0235, C.I. I 27720, C.I. A black dye such as I 11825 is used.

Ink jet recording inks include one or more of the above dyes and water and water-soluble methyl alcohol, ethyl alcohol, propyl alcohol, butyl alcohol,
Produced by appropriately mixing various organic solvents such as polyethylene glycol and glycerin with additives such as pH adjusting agents, antifungal agents, antirust agents, viscosity adjusting agents, surface tension adjusting agents, wetting agents and surfactants. .

The anionic ink jet recording ink adhering to the surface of the adhesive layer formed on the outermost layer of the paper penetrates into the adhesive layer and forms a cationic coating layer formed below the adhesive layer. It is fixed due to the influence of the contained cationic substance and exhibits water resistance.

[0032]

EXAMPLES Reference Example 1 Aluminum chloride was coated on both surfaces of a high-quality paper having a basis weight of 110 g / m ^{2 at} a rate of 2 g / m ² using a blade coater,
Methyl methacrylate graft copolymerized natural rubber latex (trade name "FB-DO-3", Mitsui Fuller Co., Ltd.)
Production) 100 parts by weight, average particle diameter of 1.8 microns, specific surface area of 300 m ² and oil absorption of 310 ml / 100 g
50 parts by weight of synthetic silica (trade name "Sylysia 350" manufactured by Fuji Silysia Ltd.) and 100 parts by weight of wheat starch having an average particle size of 17 microns were added to prepare a coating solution,
Using an air knife coater, 3 g / m ² was applied on each side.

The polyamide-epichlorohydrin resin on both sides of the high-quality paper of Reference Example 2 a basis weight of 110g / ^{m 2} (trade name "WS-500", Japan P
MC (manufactured by MC Co., Ltd.) was applied at a rate of 2 g / m ² using a blade coater, and the same adhesive as in the reference example was applied at 3 g / m 2.
^Two coats were applied on each side using an air knife coater.

Example 1 The silica of the adhesive in Reference Example 2 was a synthetic silica (trade name "Aerosil 50", manufactured by Nippon Aerosil Co., Ltd.) having an average particle size of 0.3 micron, a specific surface area of 50 m ² and an oil absorption of 90 ml / 100 g. ) Was carried out in the same manner as in Reference Example 2 except that it was changed to).

[0035] Example 2 basis weight 110g / ^{m 2} of dicyandiamide type cationic resin on both surfaces of wood free paper using a blade coater (trade name "San fix 70", manufactured by Sanyo Chemical Industries, Ltd. production) portionwise 2 g / ^{m 2} 3 g of the same adhesive as in Example 1
/ M ² was coated on both sides using an air knife coater.

Comparative Example 1 Without coating aluminum chloride in Reference Example 1, the same adhesive as in Reference Example 1 was coated on both sides by 3 g / m ² using an air knife coater.

Comparative Example 2 5 parts by weight of polyamide / epichlorohydrin resin (same as above) was added to the adhesive coating liquid of Reference Example 1 with respect to 100 parts by weight of methyl methacrylate graft copolymerized natural rubber latex (same as above). A liquid was prepared.

Table 1 shows the evaluation results of each example and comparative example. The water resistance, the ink transfer property, and the light resistance of the recording surface were evaluated as follows. The evaluation was based on the 5-point method. The highest level is 5 points, the lowest level is 1 point, and 3 points or more is a practically sufficient level. 1) Water resistance of recording surface: inkjet printer (“MJ
-500C ", manufactured by Epson Corp.) was used to record characters and images with black ink, after which the paper was immersed in water for 1 minute and the state of ink flowing out into water was observed and evaluated. 2) Image transferability: Folded in half with the recording surface of the above-mentioned recording paper inside, and sealer (“dry sealer 6860”,
Toppan Moore (manufactured by Toppan Co., Ltd.) was pressure-bonded under the condition of a gap of 130 μm, and then peeled to observe and evaluate the ink transfer condition on the peeled surface. The level at which the transfer hardly occurs is 5 points. 3) Light resistance: The recording surface of the paper after recording is 30 in direct sunlight.
After exposure for a minute, the discoloration of the paper was observed and evaluated.

[0039]

[Table 1]

The following can be seen from Table 1. 1) In each of Examples 1 and 2, water resistance, transferability, and light resistance have practically sufficient performance. 2) Examples 1 to 2 regarding whether or not a cationic coating layer is provided
It can be seen from the comparison between Comparative Example 1 and Comparative Example 1 that the water resistance is remarkably improved by providing the cationic coating layer. 3) From Example 1, it can be seen that when an epihalohydrin-based cationic resin layer is used for the cationic coating layer, the light resistance is excellent. Although not shown in Examples and Comparative Examples, the light resistance of the epihalohydrin-based cationic resin was excellent even when compared with other cationic materials. 4) Comparative Example 2 in which an epihalohydrin-based cation resin was added to the adhesive coating solution could not be evaluated because the coating solution gelled and the coating was impossible. 5) From Example 1, it can be seen that the use of the specific silica makes it possible to obtain a paper having very little image transfer. 6) From Example 2, it can be seen that when a dicyandiamide-based cationic resin layer is used for the cationic coating layer, the water resistance is particularly excellent. Although not shown in the evaluation results, in each example, no blocking occurs during storage of the paper, the pressure bonding strength is good, peeling can be performed with a moderate force after pressure bonding, and confidential information can be read. Then I confirmed that I could not re-bond.

[0041]

As described above, the pressure-sensitive postcard paper for ink-jet recording of the present invention is manufactured, and various performances as the pressure-sensitive postcard paper, that is, blocking during storage of the paper, good pressure-bonding strength, It can be peeled off with an appropriate force, confidential information can be read, it can not be re-adhered by the normal method, and it satisfies the basic required performance as a pressure-sensitive postcard paper, and the water resistance of the image is high when inkjet recording is performed. By using a specific filler in the adhesive layer, it is possible to manufacture a pressure-sensitive postcard paper having excellent performances such as very little transfer of the image to the other surface peeled off.

Continuation of front page (56) Reference JP-A-4-234473 (JP, A) JP-A-62-242600 (JP, A) JP-A-7-18232 (JP, A) JP-A-63-162275 (JP , A) JP 60-49990 (JP, A) JP 4-343794 (JP, A) JP 6-234268 (JP, A) JP 6-92012 (JP, A) JP 9-39378 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B41M 5/00 B42D 15/02

Claims (6)

(57) [Claims] 1. A cationic coating layer is formed on at least one side of a base paper, and an adhesive and a filler are mainly formed on the cationic coating layer, and the filler has a specific surface area of 10 to 100 m ² and an oil absorption of 100 ml. A pressure-sensitive adhesive postcard paper for ink-jet recording, comprising an adhesive layer for pressure-sensitive postcard, which is composed mainly of silica / 100 g or less. 2. A cationic coating layer is formed on both sides of a base paper, and an adhesive and a filler are mainly formed on one side thereof, and the filler has a specific surface area of 10 to 100 m ² and an oil absorption amount. 1. A pressure-sensitive adhesive postcard paper for ink-jet recording, comprising an adhesive layer for pressure-sensitive postcard, which is composed mainly of silica of 100 ml / 100 g or less. 3. A cationic coating layer is formed on both sides of a base paper, and an adhesive and a filler are mainly formed on one side of the base paper, and the filler has a specific surface area of 10 to 100 m ² and an oil absorption amount. Form an adhesive layer for pressure-bonded postcards mainly composed of silica of 100 ml / 100 g or less, and a non-cationic layer suitable for ink jet recording having a filler and a binder as main components on the other surface. An ink jet recording pressure-sensitive postcard paper that is characterized in that 4. The pressure-sensitive postcard paper for ink jet recording according to claim 1, wherein the cationic coating layer is an epihalohydrin type cationic resin layer. 5. The epihalohydrin-based cationic resin layer is formed by a coating liquid containing one or more of a polyamide epichlorohydrin resin, a polyamine epichlorohydrin resin, and a polyamide polyamine epichlorohydrin resin. The inkjet pressure-bonded postcard paper described in. 6. The cationic coating layer is a dicyandiamide-based cationic resin layer, wherein the cationic coating layer is a dicyandiamide-based cationic resin layer.
The pressure-sensitive postcard paper for inkjet recording according to claim 3.