JPH07101141A - Ink jet recording sheet - Google Patents

Abstract

PURPOSE:To provide an ink jet recording sheet excellent in loading properties after printing by suppressing the sudden curling toward the ink receiving layer of the ink jet recording sheet generated at the time of low humidity after printing. CONSTITUTION:An ink jet recording sheet is constituted by providing at least one ink receiving layer to the single surface of a support and providing a back coat layer to the opposite surface thereof. The back coat layer of the ink jet recording sheet is based on hydrate halloygite and silyl modified polyvinyl alcohol. Silyl modified polyvinyl alcohol is added in an amt. of 5-20 pts.wt. per 100 pts.wt. of hydrated halloysite.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording sheet for recording with ink, and particularly, curling to the ink receiving layer side after rapid printing which occurs at low humidity, that is, curling after printing is suppressed. The present invention relates to an inkjet recording sheet which is excellent in stackability of recording sheets after printing.

[0002]

2. Description of the Related Art Ink jet recording is a system in which minute droplets of ink are ejected by various operating principles to adhere to a recording sheet such as paper to record images, characters, etc. It has features such as easy colorization, great flexibility in recording patterns, and no need for development-fixing, and is rapidly spreading to various applications as a recording device for various figures including Kanji and color images.

As a recording sheet used in this ink jet recording system, various efforts have been made in terms of equipment and ink composition so that high quality paper or coated paper used in ordinary printing or writing can be used. Came. However, with the improvement of the performance of inkjet recording devices and the expansion of applications such as higher speed, higher definition or full color of the device, it is required that the recording sheet also has the following advanced characteristics. Became. (1) When recording with a normal recording device, it is excellent in transportability under a wide range of temperature and humidity conditions. (2) It is possible to prevent strike-through and cockling of the image recorded on the surface and obtain a high-quality recorded image under a wide range of temperature and humidity conditions. (3) The recording dot density and the image density are high. (4) Image color and sharpness are good. (5) The print dot shape is good. (6) Good ink absorption. (7) The recorded image has good image storability such as water resistance, light resistance, and ozone resistance. (8) In the coat type recording sheet, the adhesiveness of the coating layer is high and there is little powder falling. (9) Yellowing of the recording sheet itself is unlikely to occur. (10) Compared with the dot diameter in the single-color portion, the dot diameter in the heavy-color portion hardly changes, there is almost no bleeding in the heavy-color portion, and a high-definition recorded image can be obtained.

In the past, many proposals have been made focusing on the improvement of specific performance among these. For example, Japanese Patent Application Laid-Open No. 2-270588 discloses an ink jet recording paper in which an ink receiving layer is formed separately on the front and back surfaces of a paper base material, and Japanese Patent Application Laid-Open No. 62-282967 discloses a paper base material. An example is disclosed which has an ink holding layer and an ink transport layer, and further includes a curl suppressing layer having the same or similar physical properties as the ink holding layer. In addition, JP-A-61-2
Japanese Patent No. 35184 discloses an example in which a recording material having an ink receiving layer is provided with an anti-curl layer made of a resin such as polyacrylamide. Further, Japanese Patent Laid-Open No. 4-298380 discloses a flat pigment. There is disclosed an example in which a back surface layer containing a binder having a glass transition point in the range is provided to eliminate the phenomenon of unevenness of the recording paper during printing and improve the paper-passability of the printer.

[0005]

A recording material provided with a curl suppressing / preventing layer (Japanese Patent Laid-Open No. 62-282967, etc.) suppresses curling and prevents unevenness of the recording paper during printing. A recording sheet having a suppressing back surface layer (Japanese Patent Laid-Open No. 4-298380, etc.) aims to improve the transportability by improving contact with the printer head by preventing the recording sheet from becoming uneven during printing. , In any printer using a cut sheet, although the problem at the time of paper passing can be avoided, it is not possible to sufficiently suppress the curl after printing in the drying process after the rapid printing that occurs at low humidity,
When curling occurs after printing, there is a problem that a stacking of recording sheets occurs in the discharge tray, which causes paper jams, and the recording sheets become tubular so that the recorded image cannot be seen.

SUMMARY OF THE INVENTION It is an object of the present invention to solve these problems and provide an ink jet recording sheet having excellent stackability without curling after printing which occurs in a rapid drying process at low humidity. .

[0007]

In order to achieve this object, the present invention has at least one or more ink receiving layers on a support, and at least one or more back coat layers on the opposite surface thereof. In the ink jet recording sheet having the above, the back coat layer is mainly composed of hydrolyzed halloysite and silyl-modified polyvinyl alcohol, and contains 5 to 20 parts by weight of silyl-modified polyvinyl alcohol per 100 parts by weight of hydrolyzed halloysite. And an inkjet recording sheet.

Further, in the present invention, the support is mainly composed of wood pulp and a filler, and the Steckigt sizing degree is 90 g / m 2 of basis weight.
^The inkjet recording sheet is characterized in that it has a duration of ² to 9 seconds.

In the ink jet recording sheet of the present invention, the back coat layer is composed of granular hydrohaloysite and silyl-modified polyvinyl alcohol, and 5 to 20 parts by weight of silyl-modified polyvinyl alcohol is added to 100 parts by weight of hydrohalloysite. It is necessary to include it.

Although the curl prevention mechanism after printing is not clear,
When the silyl-modified polyvinyl alcohol dehydrates and contracts under low humidity conditions, curling occurs on the side of the back coat layer opposite to the side where curling occurs after printing, and this curling causes the curl of the binder component in the ink receiving layer after printing. It is considered that this is because it resists curling due to dehydration shrinkage. The amount of silyl-modified polyvinyl alcohol added is 5 parts by weight or more and 20
Less than 5 parts by weight is preferable, and if the addition amount is less than 5 parts by weight, the effect of curling after printing cannot be obtained, and if it exceeds 20 parts by weight, the curl to the back coat layer side under low humidity conditions becomes too large, and the printer Will cause a paper passing defect.

When a tabular pigment having an aspect ratio of 5 or more is used, positional deviation of the pigment particles occurs due to the shrinkage of the binder due to the shape characteristics of the particles, and the pigment particles move to the back coat layer side under low humidity conditions. In contrast, the use of granular hydrohaloysite having an aspect ratio of less than 5 results in less absorption of silyl-modified polyvinyl alcohol into the voids of the pigment particles, resulting in efficient film formation between the particles. Since the particle shape is granular, it is considered that only the shrinkage behavior of the silyl-modified polyvinyl alcohol is expressed without causing positional displacement of the pigment particles.

The support used in the present invention contains wood pulp and a filler as main components and has a Steckigt sizing degree of 90 basis weight.
It is preferably 9 seconds or more and 50 seconds or less on a g / m ² basis, and when the sizing degree is less than 9 seconds, the penetration of the binder component in the coating solution into the support during coating of the backcoat layer increases, and during drying, The film is not formed sufficiently, and the desired effect cannot be obtained. On the other hand, if the sizing degree exceeds 50 seconds, the penetration of the binder component into the support is suppressed, but since the film formation concentrates on the coating layer surface, curling due to binder shrinkage at low humidity becomes too large, This will cause a paper feed failure.

The ink receiving layer of the present invention may generally contain colloidal silica, white inorganic pigments, starch particles, an aqueous polymer binder, a cationic dye fixing agent, and other additives. As the white inorganic pigment, for example, calcium carbonate, kaolin, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, zinc carbonate, satin white, aluminum silicate, diatomaceous earth, calcium silicate, magnesium silicate, synthetic. Amorphous silica, pseudo-boehmite, aluminum hydroxide, alumina, lithopone,
Zeolite, hydrohalloysite, magnesium carbonate, magnesium hydroxide and the like can be mentioned. Among these, porous synthetic amorphous silica having a large pore volume is preferable.

As the starch particles, corn (corn starch), wheat, barley, rice, potato (potato),
Examples include those produced from raw materials such as cassava (tapioca), sweet potato (sweet potato), and sago, and the following (i) to (i) obtained by processing these, and rice starch powder is particularly preferable. (A) Oxidized starch obtained by oxidizing with an oxidizing agent such as sodium hypochlorite. (B) Acid-treated starch treated with hydrochloric acid or sulfuric acid. (C) Enzyme-treated starch. (D) Dialdehyde starch reacted with periodic acid. (E) Esterified starch such as acetylated starch, urea phosphorylated starch, phosphorylated starch and the like. (F) Etherified starch such as hydroxyalkylated starch and carboxyalkylated starch. (G) Cationized starch. (H) Crosslinked starch such as formaldehyde crosslinked starch, epichlorohydrin crosslinked starch, and phosphoric acid crosslinked starch. (I) Graft-polymerized starch obtained by polymerizing starch having active sites with vinyl monomers such as acrylic acid, acrylonitrile, acrylamide, methacrylic acid ester, vinyl acetate and cyclic monomers such as epoxide, episulfide, imine and lactam.

Of these starch particles, those which have little or no solubility in cold water are preferable for maintaining the particle shape in the ink jet recording sheet of the present invention.
It is almost insoluble in water at 40 ° C or lower, and the gelatinization start temperature is preferably 50 ° C or higher. The starch particle size is preferably in the range of 1 to 10 μm in volume average particle size in order to properly secure both the absorption speed and amount of ink and the quality of the recorded image.

Examples of the aqueous polymer binder used in the ink receiving layer of the present invention include starch derivatives such as oxidized starch, etherified starch and phosphoric esterified starch; cellulose derivatives such as carboxymethyl cellulose and hydroxyethyl cellulose; casein; Polyvinyl alcohol derivatives such as gelatin, soybean protein, polyvinyl alcohol, or silyl-modified polyvinyl alcohol; polyvinylpyrrolidone, maleic anhydride resin, styrene-butadiene copolymer, methyl methacrylate-butadiene copolymer, and other conjugated diene copolymer latex. An acrylic (co) polymer latex such as a polymer or copolymer of an acrylic ester and a methacrylic ester; a vinyl copolymer latex such as an ethylene vinyl acetate copolymer; Is a functional group-modified (co) polymer latex with a functional group-containing monomer such as a carboxy group of these various (co) polymers; water-based adhesives such as thermosetting synthetic resins such as melamine resins and urea resins; polymethyl Acrylic acid ester such as methacrylate, polymer or copolymer resin of methacrylic acid ester; polyurethane resin,
Mention may be made of unsaturated polyester resins, vinyl chloride-vinyl acetate copolymers, polyvinyl butyral, alkyd resins. Among these aqueous polymer binders, polyvinyl alcohol or a polyvinyl alcohol derivative such as silyl-modified polyvinyl alcohol is preferable from the viewpoint of adhesive strength.

As the cationic dye fixing agent, a monomer or oligomer of a primary to tertiary amine or quaternary ammonium salt, which dissociates and exhibits a cationic property when dissolved in water,
Mention may be made of polymers, preferably oligomers or polymers. In particular, the cation charge amount by the colloid titration method is 1 to 10 meq. / G of cationic dye fixing agent. 1 meq. If it is less than / g, the fixing performance of the water-soluble dye in the water-based ink is poor, and the water resistance of the recorded image is reduced. Also, 10 meq. If it exceeds / g, the water resistance of the recorded image can be improved with a small amount, but the light resistance and ozone resistance of the recorded image are poor, and the yellowing of the recording sheet is deteriorated.

The colloidal silica, white inorganic pigment, starch particles, aqueous polymer binder, and cationic dye fixing agent in the ink receiving layer of the ink jet recording sheet of the present invention are one kind or a mixture of two or more kinds. May be.

In the ink receiving layer of the present invention, the colloidal silica is used in an amount of 1 per 100 parts by weight of the white inorganic pigment.
The amount is preferably 0 to 100 parts by weight, more preferably 20 to 50 parts by weight. 10 to 10 starch particles
100 parts by weight, 10 to 100 parts by weight of the aqueous polymer binder, and 0.1 to 5 g / m of the cationic dye fixing agent.
² , it is preferable that the cation charge amount is contained in the range of 0.1 to 50 meq / m ² .

For the support in the present invention, a sizing agent such as a neutral sizing agent, a polymer sizing agent or an acidic sizing agent can be used alone or in combination, and a cationic starch is preferably used as a fixing agent for the sizing agent. Internal filler is 100 pulp
It is preferable to use 10 parts by weight to 45 parts by weight with respect to parts by weight, and conventionally known pigments may be used alone or in combination as a white pigment. In addition, use of additives such as a yield improver, a coloring dye, and a sulfuric acid band as a fixing agent for the coloring dye can be performed without any problem.

As a method for producing the ink jet recording sheet of the present invention, for example, pulp fibers are disintegrated into a slurry, and if necessary, fillers, sizing agents and other additives are added, papermaking is carried out by a paper machine and dried. Alternatively, after paper-making, a water-soluble substance such as starch or a polymer substance is size-pressed, dried and machine-calendered to obtain a support sheet, and then at least one layer is applied using a coating device or a size press device. The above ink receiving layer and back coat layer are provided. The method of providing the ink receiving layer and the back coat layer may be either an on-machine coater or an off-machine coater. After coating, further calender finish. The coating amount of the ink receiving layer is preferably in the range of 5 to 30 g / m ² ,
The coating amount of the back coat layer is preferably in the range of 5 to 15 g / m ² .

Other additives for the support, the ink receiving layer and the back coat layer in the ink jet recording sheet of the present invention are a pigment dispersant, a thickener, a fluidity improving agent, a defoaming agent, a defoaming agent, A release agent, a foaming agent, a penetrating agent, an anti-bacterial agent, a water resistant agent, a wet paper strength enhancer, a dry paper strength enhancer, a toning dye and the like can be appropriately blended.

The aqueous ink referred to in the present invention is a recording liquid containing a colorant, a solvent and other additives. Examples of the colorant include water-soluble dyes such as direct dyes, acid dyes, basic dyes, reactive dyes and food dyes. Examples of the solvent for the aqueous ink include water and various water-soluble organic solvents. Other additives include, for example, pH.
Examples include regulators, sequestering agents, fungicides, viscosity regulators, surface tension regulators, wetting agents, surfactants and rust inhibitors.

[0024]

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

Example 1 Freeness 450 ml CSF LBKP 67 parts, freeness 45
Pulp slurry consisting of 8 parts of 0 ml CSF NBKP, 0.6 parts of cationic starch, 10 parts of calcium carbonate
Part, light calcium carbonate 15 parts, and alkyl ketene dimer 0.05 part were added to adjust the pH of the pulp slurry to 8.
Adjusted to 2, papermaking and drying with a Fourdrinier paper machine, followed by dissolution of an aqueous solution of oxidized starch in a size press in solid content of 5 g / m on both sides.
Impregnated to be ² and dried to give a coating base paper having a basis weight of 95 g / m ² and further a machine calender finishing. The obtained coated base paper had a Steckigt sizing degree of 10 seconds.
20 parts of colloidal silica (Snowtex-O, manufactured by Nissan Chemical Co., Ltd.), 75 parts of synthetic amorphous silica (Fineseal X37B, manufactured by Tokuyama Soda Co., Ltd.), rice starch powder on the surface of the coated base paper with a large amount of filler distribution. (Micropearl, Shimada Chemical Co., Ltd., average particle size 4.9 μm) 25 parts, polyvinyl alcohol (PVA 117, Kuraray Co., Ltd.) 30 parts, and cationic dye fixing agent (Sumiletz Resin 1001, Sumitomo Chemical Co., Ltd., cationic charge amount) A coating solution containing 30 parts of 3.5 meq./g) and having a concentration of 18% was applied by an air knife coater so that the solid content was 8 g / m ^2, and the maximum temperature of hot air was 120 ° C. or higher and dried. Furthermore, on the other side of this coated paper, as a back coat layer, water-containing halloysite (Ina Kaolin, manufactured by Oharu Chemical Industry Co., Ltd., aspect ratio less than 5,
A coating solution containing 100 parts of an average particle diameter of 5 μm) and 15 parts of silyl-modified polyvinyl alcohol (R polymer 1130, manufactured by Kuraray Co., Ltd.) and having a concentration of 25% was coated with an air knife coater to a solid content of 10 g / m ^2. Dried. Further, a super calendar finish was applied to obtain an ink jet recording sheet of Example 1.

Example 2 In Example 1, as the back coat layer, 100 parts of hydrolyzed halloysite (Ina Kaolin, manufactured by Ohshun Chemical Industry Co., Ltd., aspect ratio less than 5, average particle diameter 5 μm), silyl modified polyvinyl alcohol (R polymer 1130) was used. (Manufactured by Kuraray Co., Ltd.) was mixed with 20 parts of a coating solution having a concentration of 20% and coated with an air knife coater to a solid content of 5 g / m ^2, and dried in the same manner as in Example 1 2 inkjet recording sheets were obtained.

Comparative Example 1 In Example 1, as a back coat layer, a flat delaminated kaolin clay (Nukley, manufactured by Engelhard, aspect ratio 5 to 50, particle diameter 2 to 20 μm) 10
0 part, silyl modified polyvinyl alcohol (R polymer 1
130, manufactured by Kuraray Co., Ltd.), and a coating solution having a concentration of 25% was coated with an air knife coater so as to have a solid content of 10 g / m ^2, and dried in the same manner as in Example 1 for comparison. An inkjet recording sheet of Example 1 was obtained.

Comparative Example 2 An ink jet recording sheet of Comparative Example 2 was obtained in the same manner as in Example 1 except that the amount of alkyl ketene dimer added was 0.3 part during the papermaking process. The Stöckigt sizing degree of the obtained coated base paper was 60 seconds.

Comparative Example 3 An ink jet recording sheet of Comparative Example 3 was obtained in the same manner as in Example 1 except that the amount of alkyl ketene dimer added was 0.02 part during the papermaking process. The obtained coated base paper had a Steckigt sizing degree of 7 seconds.

Comparative Example 4 An ink jet recording sheet of Comparative Example 4 was obtained in the same manner as in Example 1 except that the amount of silyl-modified polyvinyl alcohol added to the back coat layer was changed to 3 parts. Comparative Example 5 In Example 1, as a back coat layer, 100 parts of hydrolyzed halloysite (Ina Kaolin, manufactured by Oharu Chemical Industry Co., Ltd., aspect ratio less than 5, average particle diameter 5 μm), silyl modified polyvinyl alcohol (R polymer 1130, Kuraray Co., Ltd.) Inkjet of Comparative Example 5 was carried out in the same manner as in Example 1 except that a coating liquid having a concentration of 20% containing 25 parts was coated with an air knife coater so as to have a solid content of 10 g / m ² and dried. A recording sheet was obtained.

Example 3 Freeness 430 ml CSF LBKP 90 parts, freeness 48
To a pulp slurry consisting of 10 parts of 0 ml CSF NBKP, 0.8 parts of cationic starch, 15 parts of talc, 10 parts of heavy calcium carbonate, 15 parts of light calcium carbonate and 0.1 part of alkyl ketene dimer were added, and the pH of the pulp slurry was adjusted. Was adjusted to 8.2, papermaking was dried with a Fourdrinier paper machine, followed by impregnation with a size press to dissolve the oxidized starch aqueous solution to a solid content of 5 g / m ² on both sides, drying, and machine calendering. Thus, a coated base paper having a basis weight of 90 g / m ² was obtained. The Stöckigt sizing degree of the obtained coated base paper was 50 seconds. Colloidal silica (Snowtex-O, manufactured by Nissan Chemical Co., Ltd.) 2 on the surface of this coated base paper with a large amount of filler distribution.
0 part, synthetic amorphous silica (Fineseal X37B, manufactured by Tokuyama Soda Co., Ltd.) 75 parts, synthetic amorphous silica (Cyloid 6
20, Fuji Davison Co., Ltd.) 25 parts, polyvinyl alcohol (PVA 117, Kuraray Co., Ltd.) 40 parts, and cationic dye fixing agent (Sumiletz Resin 1001, Sumitomo Chemical Co., Ltd., cationic charge amount 3.5 meq./g) 30 parts The coating liquid containing 18% of the above was coated with an air knife coater so that the solid content was 8 g / m ^2, and the maximum temperature of hot air was 120 ° C. or higher and dried. Furthermore, on the other side of this coated paper, as a back coat layer, water-containing halloysite (Ina Kaolin, manufactured by Oharu Chemical Industry Co., Ltd., aspect ratio less than 5,
A coating solution containing 100 parts of an average particle size of 5 μm) and 5 parts of silyl-modified polyvinyl alcohol (R polymer 1130, manufactured by Kuraray Co., Ltd.) and having a concentration of 25% was applied by an air knife coater so that the solid content was 15 g / m ^2. Dried. Further, a super calendar finish was applied to obtain an inkjet recording sheet of Example 3.

Comparative Example 6 In Example 3, as a back coat layer, 100 parts of hydrohalloysite (Ina Kaolin, manufactured by Oharu Chemical Industry Co., Ltd., aspect ratio less than 5, average particle diameter 5 μm), silyl modified polyvinyl alcohol (R polymer 1130) were used. , Manufactured by Kuraray Co., Ltd.) and 20 parts of SBR latex (JSR0693, manufactured by Japan Synthetic Rubber) were mixed at a concentration of 25% with an air knife coater to a solid content of 15 g / m ² and dried. An inkjet recording sheet of Comparative Example 6 was obtained in the same manner as in Example 3 except for the above.

Comparative Example 7 In Example 3, instead of the silyl-modified polyvinyl alcohol, polyvinyl alcohol (P
Example 3 except that VA105, manufactured by Kuraray) was used.
An ink jet recording sheet of Comparative Example 7 was obtained in the same manner as in.

<Performance> The performance of the ink jet recording sheet was measured by the following method. (1) White paper curl Under environmental conditions of 15 ° C and 10% RH, 100 sheets were stacked with the ink receiving layer side facing up, left for one day, and the lift of the four corners of the top 10 sheets was measured on a scale, and the average was calculated. Displayed by value. The curl toward the ink receiving layer surface side is indicated by +, and the curl toward the back coat layer surface side is indicated by-. As for the state of blank curl, curling toward the backcoat layer side rather than toward the ink receiving layer surface side is preferable in terms of transportability. However, if the curl exceeds 10 mm, poor transportability will occur. (2) Curling after printing Using a color inkjet printer (IO-720, manufactured by Sharp Corporation) under an environmental condition of 15 ° C. and 10% RH,
Solid printing was performed with cyan single color on the entire surface of the A4 size sheet, and the state after standing for 30 minutes was observed. Evaluation Criteria a: No lifting of the four corners is recognized, or even if it is recognized, the entire recorded image is observed. b: Lifting of the four corners is recognized, but more than half of the recorded image is observed. c: The recording sheet is tubular, and the recorded image cannot be observed at all, or even if it can be observed, it is less than half.

(3) Loadability The loadability is such that a color inkjet copying machine (pixel jet, manufactured by Canon Inc.) under the environmental conditions of 15 ° C. and 10% RH.
50 ink-jet recording sheets were set in the cassette of No. 3, and the number of sheets stacked on the paper discharge tray when 10 black solid images were continuously copied was measured. Evaluation Criteria A: The number of loaded sheets is 10. B: The number of stacked sheets is 8 to 9. C: The number of stacked sheets is 7 or less.

Table 1 shows the measurement results of the performance of the ink jet recording sheets of Examples 1 to 3 and Comparative Examples 1 to 7.

[0037]

[Table 1]

[0038]

The ink jet recording sheet of the present invention is
The back coat layer is composed of granular hydrohaloysite and silyl-modified polyvinyl alcohol, and the silyl-modified polyvinyl alcohol is added to 100 parts by weight of hydrohaloysite.
By containing 5 parts by weight or more and 20 parts by weight or less, curling after printing under low humidity conditions is suppressed, so that the problem of observation failure of a recorded image due to tube formation after printing is solved, and a discharge tray after recording The above stackability is excellent, and continuous recording has become possible without the paper-discharging obstacles caused by poor stackability. That is, according to the present invention, for the first time, a recording sheet for inkjet recording using a water-based ink is excellent in curl after printing in low humidity, and particularly in an inkjet recording apparatus using a cut sheet, excellent in stackability after recording even in low humidity. An inkjet recording sheet is provided.

Claims (2)

[Claims] 1. An inkjet recording sheet having at least one or more ink receiving layers on a support and at least one or more backcoat layers on the opposite surface thereof, wherein the backcoat layers are hydrohaloysite and silyl modified. An inkjet recording sheet comprising polyvinyl alcohol as a main component and silyl-modified polyvinyl alcohol in an amount of 5 parts by weight or more and 20 parts by weight or less based on 100 parts by weight of hydrohalloysite. 2. The support contains wood pulp and a filler as main components, and has a Steckigt sizing degree of 9 g based on a basis weight of 90 g / m ^2.
The ink jet recording sheet according to claim 1, wherein the ink jet recording sheet is for about 50 seconds.