JP3377460B2 - Ink jet recording paper and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording paper and a method for producing the same, and in particular, an ink reproducible image having good image reproducibility enough to be used for proofing printed matter and having a high-grade dull tone. The present invention relates to an inkjet recording paper suitable for a photo-type inkjet printer, which has good absorptivity and discharges a large amount of ink, and a manufacturing method thereof.

[0002]

2. Description of the Related Art In ink jet recording, since ink droplets are ejected by various methods to form an image, high-speed printing and full-color printing are easy, and the price of the device is low. Has achieved. Accompanying this, the market for inkjet recording paper has diversified. For example, there is an increasing demand for an inkjet printer to perform proof production of a printed matter, which has conventionally been performed using an ink and a proof plate. In particular, in recent full-color inkjet printers, printers that can realize image quality approaching that of silver halide photographs have emerged when special paper is used, due to the miniaturization of ink droplets and the use of photo ink with a low dye concentration.

In general printing, a paper having a glossiness corresponding to a desired finish of printed matter is used.
Cast coated paper (gloss type), art paper (semi-gloss type), dull art paper (dull tone type), coated paper, lightly coated paper, high quality paper (mat type), etc. are used according to the application. Therefore, the proof paper for printing is required to have various glossiness like the printing paper. However, the recording paper used for the ink jet printer is conventionally classified into a gloss type having high gloss and a mat type having almost no gloss.

As a conventional technique for obtaining a glossy ink jet recording paper, a layer of colloidal particles having a particle diameter of 300 nm or less is provided on an ink receiving layer as described in JP-A-7-101142. , 75 degree specular gloss is 25%
A method for obtaining an inkjet recording paper having the above glossiness, as described in JP-A-9-183265,
A method of providing two or more ink receiving layers containing colloidal silica and an adhesive on a support, or JP-A-3-2150
80, JP 3-256785, JP 7-89220, JP 7-1
Two ink receiving layers, as described in Japanese Patent No. 17335,
There is disclosed a method in which the upper layer is made to be a layer or more and the upper layer is made to be a glossy layer.

In each of these conventional techniques, a film base is used because the purpose is to obtain a product having a considerably high gloss level such as a printed matter printed on a photograph, art coated paper or cast coated paper. In some cases, a casting method or a transfer method, which is a manufacturing method having a more glossy finish, is used as a finish, or an extremely large amount of colloidal silica is applied.

In any case, in order to impart a glossy feeling, a pigment having a small particle diameter, that is, colloidal particles such as silica and a binder are used, but when spherical colloidal particles are used, voids after film formation are generated. Since it becomes smaller, there is a drawback that the ink absorption speed becomes smaller. Further, since colloidal silica does not have internal voids like synthetic amorphous silica, when using colloidal silica, it is necessary to apply a thick ink absorbing layer in order to obtain the required ink absorbing capacity. . However, when the ink absorbing layer is applied thickly, the powder falling phenomenon easily occurs. Therefore, when the amount of the binder compounded is increased to prevent the powder from falling off, there is a drawback in that the absorption speed on the surface is particularly slow and the bleeding phenomenon occurs and high-resolution printing cannot be performed.

On the other hand, it is known that if the voids in the ink receiving layer are large, the ink absorption rate is high, and if the specific surface area of the pigment used in the ink receiving layer is large, a large volume of ink can be absorbed. Therefore, pigments such as synthetic amorphous silica having a large specific surface area and a particle diameter of several μm or more are widely used by aggregating small primary particles such as synthetic silica in the ink receiving layer. However, ink jet recording papers using these pigments are of so-called mat type, which has almost no gloss. As described above, the conventional method cannot produce an inkjet recording paper having an appropriate glossiness, such as a lightweight coated paper or a dull printing paper without calendar finish.

[0008]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to have a sufficient ink absorbency such that the bleeding phenomenon does not occur even when a recent photo type high resolution ink jet printer is used, and the color density is high. For producing proofs of printed matter that can obtain printed matter with excellent reproducibility and has an appropriate glossy feeling, such as light weight coated paper or dull tone printing paper without calendar finish, that is, dull tone. An object of the present invention is to provide a usable inkjet recording paper and a method for manufacturing the same.

[0009]

The above objects of the present invention are as follows.
A support, an ink absorption layer sequentially provided on the support, and
An inkjet recording sheet comprising a two or more layers of colloidal silica layer, the coating amount of each layer of the colloidal silica layer is 1 to 6 g / m ^2, colloidal silica
It was achieved by an inkjet recording paper characterized in that 90% by weight or more of the mosquito was chain colloidal silica . Particularly, the colloidal silica layer surface has a 75-degree specular gloss of 10% or more and 60% or less, and a 20-degree specular gloss of 10% or less, and at least:
By using a cationic colloidal silica as the chain colloidal silica used in the colloidal silica layer provided on the outermost layer, a good ink jet recording paper can be obtained, which contains 90% by weight or more of the chain colloidal silica.
It is easily manufactured by calendering the ink-receiving layer before providing the contained colloidal silica layer.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The colloidal silica layer in the present invention is a layer for adjusting glossiness, ink density and color reproducibility so as to meet the purpose of the present invention. Further, the chain colloidal silica used in the colloidal silica layer of the present invention,
Chain-like, that is, spherical colloidal silica, which is a primary particle, is connected in a certain number in series or in part by branching. Its size (length) is preferably 40 to 200 nm as measured by a laser scattering method.

The size (length) of colloidal silica is 40.
When it is less than nm, or in the case of so-called spherical colloidal silica which is not chain-like, although a glossy feeling is obtained, the ink absorption is not sufficient and the ink absorption speed is slow, so it is called the bleed phenomenon at the boundary of mixed colors. Bleeding easily occurs and is not suitable for a photo type inkjet printer that ejects a large amount of ink.

The chain colloidal silica used in the present invention preferably has a primary particle of 3 to 40 nm. It is difficult to stably produce primary particles having a particle size of less than 3 nm, and if it exceeds 40 nm, the specific surface area of the chain-like colloidal silica becomes small, so that the ink capture rate in the colloidal silica layer decreases, so that the coloring property,
That is, the color density and color reproducibility are insufficient.

By the way, generally well-known colloidal silica has a spherical particle shape and has a certain degree of film-forming property by itself, and this tendency is more remarkable as the particle diameter is smaller. When spherical colloidal silica having a large particle diameter is used, a binder is required to secure film-forming properties, and the ink absorption rate of the colloidal silica layer becomes small.

On the other hand, spherical colloidal silica having a small particle diameter has a good film-forming property, but has a small void after the film-forming and a low ink absorption rate. Therefore, when chain colloidal silica is used as in the present invention, colloidal silica particles are appropriately entangled with each other during film formation, so that not only the dropout of silica particles is suppressed without using a binder, but a particularly large ink absorption rate is obtained. Voids of an appropriate size required for use in the required phototype inkjet printer can be obtained.

When ordinary spherical colloidal particles are used for the colloidal silica layer, the coating liquid for the colloidal silica layer penetrates into the ink absorbing layer. Therefore, in order to develop gloss, it is necessary to increase the coating amount of the colloidal silica layer so much that the cost becomes high. In addition, since spherical colloid particles enter the voids of the ink absorbing layer and fill the voids of the ink absorbing layer, the ink absorbing speed becomes slower, and the bleeding phenomenon easily occurs. It is not preferable as a recording sheet for a type inkjet printer. On the other hand, when colloidal silica having a chain shape and a specific size is used as in the present invention, permeation of the colloidal silica layer coating solution into the ink absorbing layer is suppressed, and therefore, it is appropriate. The amount of coating will provide sufficient gloss.

The chain colloidal silica used in the present invention is preferably cationic from the viewpoint of dye fixation and water resistance. Therefore, it is preferable to use a cationic chain colloidal silica for at least the outermost colloidal silica layer. In addition, since water resistance is one of the basic performances required for ink jet recording paper, it is necessary to impart water resistance to the colloidal silica layer as well, but since the dye fixing agent is usually a cation, it is an anionic colloidal silica. Cannot be mixed.

Therefore, in the present invention, it is preferable to use a cationic chain colloidal silica which itself has water resistance and can be used in combination with a dye fixing agent. From the viewpoint of improving water resistance, at least the outermost layer is used. It is particularly preferable to use a cationic colloidal silica for the above. When the colloidal silica layer is composed only of the anionic colloidal silica layer, the drying speed is slow,
Show-through easily occurs.

The colloidal silica layer needs to be thick to some extent in order to obtain a sufficient image coloring property, but if the coating amount per one time is increased, the tendency of powder falling after drying becomes stronger. Therefore, it is not impossible to use a binder together to prevent the powder from falling off, but when a binder is used together, the ink absorption speed on the surface becomes particularly slow, and the bleeding phenomenon occurs, so high-resolution printing is not possible. become unable. Therefore, it is preferable to use the binder as little as possible.

In this respect, the colloidal sills used in the present invention
Mosquitoes have strong self-adhesiveness and basically require a binder.
do not do. However, the colloidal silica does not fall off.
As described above, in the present invention, the coating amount is not more than a certain amount.
It is necessary to provide at least two colloidal silica layers
Become. In this case, coating per colloidal silica layer
The amount is 1-6g / m^TwoIs preferred and more preferred
Kuwa 1.5-4g / m ^TwoIs.

In the colloidal silica layer, a dye fixing agent, a sizing agent, a defoaming agent, and a defoaming agent, to the extent that the effects of the present invention are not impaired.
It is possible to add various additives such as a color adjusting agent. In this case, the proportion of chain-like colloidal silica in the colloidal silica layer needs to be 90% by weight or more.
It

If the coating amount per one time is less than 1 g / m ² , gloss can be obtained to some extent by increasing the number of coatings, but the number of top coatings is not sufficient because the uniformity of the coated surface is insufficient. Manufacturing costs also increase. On the contrary, if the coating amount per one time exceeds 6 g / m ² , powder will fall off and the coating layer after drying will have many cracks, and the ink will not be printed along the cracked grooves during printing. This is not preferable because a phenomenon of flowing through the screen occurs and the image is disturbed.

The colloidal silica layer of the present invention is preferably dull. Dull tone is one of the expressions that express the glossiness of coated paper for printing, and it means a moist and calm gloss. In order to achieve this dull tone, it is preferable that the 75-degree specular gloss is 10 to 60% and the 20-degree specular gloss is 10% or less. More preferably 7
The 5 degree specular gloss is 15% to 50%, and at the same time, the 20 degree specular gloss is 5% or less. 75 degree specular gloss is 10
% Or less, a glossy feeling called dull tone cannot be obtained, and conversely 6
If it exceeds 0%, the glossiness is glossy rather than dull. If the 20-degree specular gloss exceeds 10%, a dull, moist luster cannot be obtained.

The glossiness can be adjusted by the total thickness of the colloidal silica layer and the conditions for calendering. The larger the total thickness of the colloidal silica layer and the higher the calendering linear pressure, the higher the 75 ° specular gloss. Therefore, if the calendering linear pressure is increased until the 75-degree specular gloss exceeds 60% in the structure of the present invention, the surface becomes dense and the ink absorption speed becomes slow, resulting in a bleed phenomenon.

The support used in the present invention is not particularly limited as long as it is in the form of a sheet. For example, starting with paper, polyethylene, cellophane, polypropylene, films such as polyester and polyvinyl chloride can be used, but considering cost and environmental issues, inexpensive and recyclable high-quality paper, art paper, It is preferable to use paper such as coated paper.

The ink absorption layer provided on the support is not particularly limited, but it is preferable that the main components are a pigment having a large specific surface area or oil absorption and a water-soluble or water-dispersible binder. As the pigment, for example, kaolin, calcium carbonate, magnesium oxide, zinc oxide, aluminum silicate, magnesium silicate or the like may be used, but it is particularly preferable to use amorphous silica, synthetic amorphous silica, or alumina sol.

Examples of the water-soluble or water-dispersible binder include water-soluble polymers such as polyvinyl alcohol, casein, starch and gelatin, and styrene-
Water-dispersible polymers such as butadiene latex, acrylic latex, and vinyl acetate latex can be used.

The coating amount of the ink absorbing layer in the present invention is
Make appropriate decisions according to your goals. For example, in a receiving layer mainly composed of a pigment such as synthetic amorphous silica having a high absorbability, the coating amount may be small because the voids per unit volume are large, but a calcined clay having a relatively poor absorbency, etc. In the receiving layer mainly composed of the above pigment, since there are few voids, it is necessary to increase the coating amount. Further, in the ink absorbing layer, if necessary, a cationic resin such as polyamine, a tertiary or quaternary ammonium salt, a dispersant, an antifoaming agent, a coloring agent, and a charging agent are added to the extent that the effects of the present invention are not impaired. Inhibitors, sizing agents, surfactants and the like can be added as appropriate.

Since the colloidal silica layer can be uniformly applied when the surface of the ink absorbing layer is smooth, in the present invention, it is preferable to calender the surface after applying the ink absorbing layer. The colloidal silica layer and the ink absorbing layer in the present invention can be appropriately provided by using various coating devices such as various blade coaters, roll coaters, air knife coaters, bar coaters, curtain coaters, rod blade coaters and the like.

When calendering the surface of the ink absorbing layer or the surface of the colloidal silica layer, various calendering devices can be used. As a calendering device for final finishing, it is preferable to use a device such as a super calender or a soft calender, which is a combination of elastic rolls and metal rolls, in order to reduce uneven gloss and cracking of the coating layer. In particular, a soft calender device using an elastic roll having a Shore hardness D in the range of 60 to 90 is used for linear pressure 50
When used in an amount of up to 200 kg, it is easy to obtain a dull gloss without crushing the voids of the colloidal silica layer.

[0030]

Since the ink jet recording paper of the present invention has the chain colloidal silica layer on the ink absorbing layer having the ink absorbing property, it is excellent in the coloring property and roundness of the printing dots and is moist in a dull tone. It is a high-quality inkjet recording paper having the above gloss and having sufficient ink absorbability even when printed by a photo ink type inkjet printer.

[0031]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto. Moreover, the compounding part and% in an Example are a weight part and weight%, respectively unless there is particular notice.

Example 1.Preparation of support The support consists of 85 parts of LBKP with a freeness of 380 ml and NB of 500 ml.
KP 15 parts, talc 15 parts as a filler, commercially available rosin-based
0.5 parts, commercial cationized starch 0.3 parts, sulfur
Add 0.5 parts of acid band and 0.1 parts of commercially available paper strengthening agent to water.
To 0.8% slurry and then use a Fourdrinier paper machine
Use, the basis weight is 130g / m^TwoIt was made into paper.

[0033]Preparation and coating of color for ink absorption layer Synthetic amorphous silica (Fineseal X37B, Tokuyama Soda)
100 parts, polyvinyl alcohol (PVA117, made by Kuraray) 25
Parts, ethylene vinyl acetate copolymer emulsion (Sumika
Flex 401, Sumitomo Chemical) 10 parts, nonionic SB
Latex (LX438C, made by Zeon Corporation) 5 parts, dye fixing agent
(Polyfix 700, Showa High Polymer) 8 parts, antifoam (SN
Deformer 480, San Nopco) 0.2 parts, cationic
3 parts sizing agent (Polymaron 360, Arakawa Chemical Co., Ltd.)
Add 0.005 parts ruing agent and 0.5 parts fluorescent dye to water
To produce a color for the ink absorption layer with a solid concentration of 20%.
I made it. Weight of this color after drying on the above-mentioned support
Is 15 g / m^TwoApply with a bar blade coater so that
Scuff dry until the moisture content of the entire coated paper reaches 4.5%.
It was dried with an ear to obtain a paper coated with an ink absorption layer.

[0034]Coating of colloidal silica layer On the ink absorbing layer of the above ink absorbing layer coated paper, particles
Anionic chain-like colloidal silica with a diameter of 80 nm (Snowte
X UP, Nissan Chemical Co., Ltd.) 100 parts and antifoaming agent (KM-72)
F, Shin-Etsu Chemical Co., Ltd.) 20% slurry made by adding 0.2 parts to water
Using a bar blade coater, the weight after drying is 2
g / m^TwoCoating so that the moisture content becomes 4.5%, and dry.
It was dried to form a first colloidal silica layer.

Next, as the second colloidal silica layer, 100 parts of a cationic chain colloidal silica having a particle diameter of 90 nm (Snowtex OUP, manufactured by Nissan Chemical Co., Ltd.), a dye fixing agent (Polyfix 700, manufactured by Showa Polymer Co., Ltd.) ) 6 parts, cationic sizing agent (Polymaron 360, Arakawa Chemical Co., Ltd.) 3 parts, antifoaming agent (KM-72F, Shin-Etsu Chemical Co., Ltd.) 0.2 parts are added to water 1
The 5% slurry was applied using a bar blade coater so that the weight after drying would be ² g / m ² .

Then, a curl correction solution containing 100 parts of Movinyl 747 and 0.1 part of calcium stearate (Nopcoat C104H) was coated on the back surface so that the weight after drying was 0.5 g / m ^2, and the moisture content was 4.8. After drying until the content reached 100%, the surface was subjected to a finishing surface treatment with a soft calendar device under a linear pressure of 100 kg / cm to obtain an inkjet recording paper having a 75 ° specular gloss of 20%.

Example 2. For both the first and second colloidal silica layers, 100 parts of cationic colloidal silica having a particle size of 90 nm (Snowtex OUP, manufactured by Nissan Chemical Co., Ltd.), 6 parts of a dye fixing agent (Polyfix 700, manufactured by Showa Polymer Co., Ltd.), cation A 15% slurry made by adding 3 parts of a water-based sizing agent (Polymaron 360, manufactured by Arakawa Chemical Co., Ltd.) and 0.2 part of an antifoaming agent (KM-72F, manufactured by Shin-Etsu Chemical Co., Ltd.) to water and having a dry weight of 2 g / In the same manner as in Example 1 except that the coating was performed so as to be m ² , 7
An ink jet recording paper having a 5 degree specular gloss of 22% was obtained.

Example 3. The slurry used in the first colloidal silica layer is a cationic colloidal silica with a particle size of 125 nm (Snowtex SO, Nissan Chemical Co., Ltd.) 100
Parts, dye fixing agent (Polyfix 700, Showa High Polymer Co., Ltd.) 6 parts, cationic sizing agent (Polymaron 360, Arakawa Chemical Co., Ltd.) 3 parts, and defoaming agent (KM-72F, Shin-Etsu Chemical Co., Ltd.) 0.2
The same as in Example 1 except that the slurry was replaced with 15% slurry prepared by adding 15 parts to water, and the 75 ° specular gloss was 18%.
A recording paper for inkjet of was obtained.

Example 4. An ink jet having a 75 ° specular gloss of 45% was obtained in exactly the same manner as in Example 2 except that the ink absorbing layer was pretreated with a soft calender at a linear pressure of 80 kg / cm and then a colloidal silica layer was provided. I got a recording sheet.

Example 5. An inkjet recording paper having a 75 ° specular gloss of 35% was obtained in exactly the same manner as in Example 4 except that the finishing soft calender treatment was not performed after the second layer of the colloidal silica layer was provided.

Comparative Example 1. Instead of the Snowtex UP used in the first colloidal silica layer, a spherical anionic colloidal silica having a particle diameter of 20 nm is used, and the particle diameter of the snowtex OUP used in the second colloidal silica layer is changed.
Except for using 40 nm spherical cationic colloidal silica, the same procedure as in Example 1 was performed to obtain a 75 degree specular gloss.
23% inkjet recording paper was obtained.

Comparative Example 2. As the colloidal silica of the first colloidal silica layer and the second colloidal silica layer, a spherical cationic colloidal silica having a particle size of 40 nm was used, and the 75-degree specular gloss was 20% in exactly the same manner as in Example 1. A recording paper for inkjet of was obtained.

Comparative Example 3. Except that the second colloidal silica layer was not provided and only the first colloidal silica layer was provided, the 75 ° specular gloss was 15 in the same manner as in Example 2.
% Of ink jet recording paper was obtained.

Comparative Example 4. An inkjet recording paper having a 75 ° specular gloss of 25% was obtained in exactly the same manner as in Comparative Example 3 except that the coating amount of the first colloidal silica layer was 8 g / m ² .

Comparative Example 5. Anionic chain colloidal silica with a particle diameter of 80 nm as the colloidal silica of the first colloidal silica layer (Snowtex UP, manufactured by Nissan Chemical Co., Ltd.) 10
An inkjet recording paper having a 75-degree specular gloss of 22% was obtained in exactly the same manner as in Comparative Example 4 except that 0 part was used. Comparative Example 6. An inkjet recording paper having a 75 ° specular gloss of 32% was obtained in exactly the same manner as in Example 2 except that the coating amount of the second colloidal silica layer was 8 g / m ² .

Comparative Example 7. As the first colloidal silica layer and the second colloidal silica layer, 100 parts of cationic colloidal silica having a particle diameter of 90 nm (Snowtex OUP, manufactured by Nissan Chemical Co., Ltd.), 20 parts of polyvinyl alcohol (PVA117, manufactured by Kuraray Co., Ltd.), and defoaming. Agent (KM-72F, Shin-Etsu Chemical Co., Ltd.) 0.2
A 75% specular gloss of 15% was obtained in exactly the same manner as in Example 2 except that a 15% color obtained by adding a part to water was applied so that the weight after drying was 2 g / m ^2. A recording paper for inkjet of was obtained.

Comparative Example 8. Example 2 except that the coating amount was 0.5 g / m ² for both the first and second colloidal silica layers.
In the same manner as described above, an inkjet recording paper having a 75 ° specular gloss of 8% was obtained.

Comparative Example 9. An ink jet recording paper having a 75 ° specular gloss of 4% was obtained without providing a colloidal silica layer on the ink absorbing layer coated paper.

Comparative Example 10. The same as Comparative Example 6 except that a layer formed by coating and drying a pseudo-boehmite-based alumina sol (alumina sol-520 manufactured by Nissan Chemical Co., Ltd.) having a particle diameter of 18 nm was provided in place of the first and second colloidal silica layers. Thus, an inkjet recording paper having a 75 ° specular gloss of 45% was obtained.

The treatment methods of the above Examples and Comparative Examples are summarized in Table 1.

[Table 1]

The results of various evaluations of the obtained recording paper are shown in Table 2.

[Table 2]

The evaluation method of the obtained paper is as follows.
Describe. If it is evaluated as ◎ or ○ in the table, there is a problem in practical use.
However, there is a practical problem in the evaluation of Δ or less.1) gloss In accordance with JIS-P-8142 and JIS-Z-8141, Murakami Color Research Institute
Measured with a laboratory specular gloss meter (GM-26for75 degree, GM-26D)
It is the specular gloss at 75 degrees and 20 degrees, which are determined.2) Color development Color formation depends on color density, roundness of dots, and bleed.
The boundary bleeding was evaluated.

[0054]2-1) Color density Seiko Epson inkjet printer PM-7
Black (B
K), cyan (C), magenta (M), yellow (Y)
Create a printer image and attach the printer driver to the printer
-For the print quality, select
For the paper, select the special glossy paper and print it.
I went out. After leaving in a constant temperature and humidity room for one day, Macbeth
Print density of each color using a densitometer (RD915, Macbeth)
Was measured and the average value was used as the average concentration.

Evaluation criteria ⊚: Average density is 1.8 or more ◯: The average density is in the range of 1.7 to less than 1.8 Δ: Average concentration is in the range of 1.6 or more and less than 1.7 ×: Average density is less than 1.6

[0056]2-2) Roundness 1) Print a gray image in the same way as the color density and
Visually check the dot shape magnified 250 times with a mirror.
The following criteria evaluated. ◎: The contour is almost a perfect circle ○: The contour is smooth and the shape is almost circular. Δ: The contour is disordered and is an ellipse rather than a circle ×: The contour is jagged and hard to call a circle

[0057]2-3) ink absorption Mark the pattern where the magenta and green solid images are adjacent
Bleed at the boundary (bleed) based on the following criteria
And visually evaluated. Occurs in magenta and green
The border bleeding part turns black, so a more rigorous evaluation can be performed.
It ⊚: No bleeding is observed at the boundary B: Almost no bleeding is observed at the boundary △: Bleeding is slightly recognized at the boundary ×: Bleeding is noticeable at the boundary

[0058]3) Surface strength Stick cellophane on the recording surface and rub it 20 times with a rubber roller.
Fix the end part only to the spring and
The peel strength was measured and evaluated according to the following criteria. ⊚: Peel strength is 500 g or more ◯: Peel strength is in the range of 300 g or more and less than 500 g Δ: Peel strength is in the range of 200 g or more and less than 300 g ×: Peel strength is less than 200 g

[0059]4) Cracks in the coating layer Below is a photograph of the surface of the coating layer magnified 300 times with an electron microscope.
It was visually evaluated according to the following criteria. ⊚: No cracks are observed ○: Some cracks (1 to 2 pieces / one field of view) recognized
To be Δ: Significant cracks (5-10 pieces / 1 field of view)
To be ×: Cracks are recognized on the entire surface (10 or more / 1 field of view)
To be

As is clear from the results shown in Table 2, in the case of the ink jet recording paper of the present invention, an ink absorbing layer having sufficient absorbability even when printed by a printer equipped with a photo ink, and the ink absorbing layer formed on the ink absorbing layer. Since the chain colloidal silica layer having a coating amount within the range that does not impair the property is provided, the glossiness of a so-called dull-like printing paper with a moist surface feeling can be achieved even in a white paper and a printing portion. Therefore, it was proved that not only the design but also the characters are not too shiny and glaring, so that it is easy to read and that the same high color development as glossy paper can be obtained.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-9-183267 (JP, A) JP-A-9-183265 (JP, A) JP-A-10-166715 (JP, A) JP-A-10- 181184 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B41M 5/00

Claims (4)

(57) [Claims] 1. An inkjet recording paper comprising a support, an ink absorbing layer sequentially provided on the support, and two or more colloidal silica layers, wherein the coating amount of each layer of the colloidal silica layer is 1. ~ 6 g / m ² and
90% by weight or more of colloidal silica is chain colloidal
Ink jet recording paper characterized by being made of Rica . 2. The ink jet recording paper according to claim 1, wherein the surface of the colloidal silica layer has a 75-degree specular gloss of 10% or more and 60% or less and a 20-degree specular gloss of 10% or less. 3. The ink jet recording paper according to claim 1, wherein the chain colloidal silica used in at least the outermost colloidal silica layer is cationic. 4. An ink absorption layer, which is sequentially formed on a support, and
The colloidal <br/> Darushirika layer containing a chain shaped colloidal silica 90 wt% or more, so that the coating amount of the 1 to 6 g / ^{m 2}
A method for producing an ink jet recording paper, wherein the ink absorbing layer is calendered before providing the colloidal silica layer.