JPH10278409A - Recording paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve print quality and ink absorptiveness by providing an ink absorptive layer containing a water-soluble resin or a water-dispersible resin and an ester nonionic surfactant whose HLB is a specified value or greater. SOLUTION: The ink absorptive layer is a layer containing a water soluble- resin or a water-dispersible resin and an ester noionic surfactant whose HLB is 11 or greater. The amount of the ester noinonic surfactant whose HLB is 11 or greater in the ink absorptive layer is 0.01 to 30 pts.wt. preferably 0.01 to 20 pts.wt., more preferably 0.1 to 10 pts.wt., or particularly preferably 0.5 to 10 pts.wt. to 100 pts.wt. of the water-soluble resin or the water-dispersible resin. The use of the ester noionic surfactant makes it possible to improve the wettability of ink and make ink to be absorbed easily into the inside of the ink absorptive layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording paper using an aqueous ink, and more particularly to an ink jet recording paper having good print quality and excellent ink absorbability.

[0002]

2. Description of the Related Art Ink jet recording is free of noise, is capable of high-speed recording, is used in terminal printers and the like, and has been rapidly spreading in recent years. Also, by using a large number of ink nozzles, it is easy to perform multicolor recording,
Multicolor ink jet recording is performed by various ink jet recording methods.

As the ink for ink jet recording, an aqueous ink mainly composed of water is mainly used from the viewpoints of safety and recording characteristics, and polyhydric ink is used for preventing clogging of nozzles and improving discharge characteristics. Alcohol and the like are often added.

[0004] Therefore, the recording paper used in the ink jet recording system is excellent in storage stability that absorbs water-based ink quickly and does not bleed the ink (image blurs even after long-term storage). No) The components of the ink-absorbing layer do not desorb from the base paper. There is no stickiness in terms of handling. It is necessary to satisfy various physical properties such as continuous printing. Whether these requirements can be satisfied or not depends largely on the characteristics of the recording paper used. However, there is no actual recording paper that satisfies all of these required properties.

For example, some recording papers have been proposed in which an ink absorbing layer containing various polymers is provided on a base paper in order to improve the printability and the ink drying property after printing (Japanese Patent Publication No. Sho.
JP-B-60-27588, JP-B-64-5551, JP-B 2-3166
No. 9 and Japanese Patent Publication No. 5-20278).

[0006]

However, the recording papers described in these publications are not satisfactory in print quality, probably because the ink absorbing layer components used are not appropriate. Therefore, an object of the present invention is to provide a recording paper having good printing quality and excellent ink absorbability.

[0007]

An object of the present invention is to provide a recording paper comprising an ink absorbing layer containing a water-soluble resin or a water-dispersible resin and a specific surfactant on at least one side of a base paper. Achieved by

That is, the present invention provides an ink absorbing layer containing a water-soluble resin or a water-dispersible resin (A) and an ester nonionic surfactant (B) having an HLB of 11 or more on at least one side of a base paper. And the mixing ratio of component (A) and component (B)
(A): (B) = 100: 0.01 to 30 (weight ratio) is provided.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The ink absorbing layer in the invention is a layer containing a water-soluble resin or a water-dispersible resin (A) and an ester nonionic surfactant (B) having an HLB of 11 or more, and preferably further a polyhydric alcohol (C). And at least one selected from crosslinked silicone particles (D) having a particle size of 0.5 to 50 μm and layered silicates (E) modified with an organic treating agent.

The water-soluble resin or the water-dispersible resin (A) in the present invention is a base material necessary for absorbing the ink, since the ink used in the ink jet printer is an aqueous ink. As the water-soluble resin or the water-dispersible resin (A), for example, potato starch,
Potato starch, oxidized starch, phosphate starch, carboxylated starch, hydroxyethylated starch, cyanoethylated starch, acrylic acid grafted starch,
Methylcellulose, hydroxyethylcellulose, carboxyethylcellulose, hydroxypropylcellulose, hydroxypropylethylcellulose, cellulose sulfate, dextrin, corn starch, konjac, seaweed, agar, sodium alginate, troloioi, tragacanth gum, gum arabic, locust bean gum, guar gum, pectin, carrageenan, glue , Gelatin, casein, soy protein, albumin, fully or partially saponified polyvinyl alcohol and its anions, cation modified products, acetalization degree or butyralization degree
30% or less of polyvinyl alcohol, polyacrylamide and its copolymer, polyvinylpyrrolidone and its copolymer, polyethylene oxide, polypropylene oxide, ethylene oxide-propylene oxide copolymer, polybutylene oxide, carboxylated polyethylene oxide, polyacrylic acid And a sodium salt thereof, a styrene-maleic anhydride copolymer, an ethylene-maleic anhydride copolymer, and the like, and one or a mixture of two or more of these water-soluble resins or water-dispersible resins can be used. .

Among these resins, the degree of saponification is 65 to 90% and the average degree of polymerization is 40, particularly from the viewpoint of film formability and ink absorbability.
A partially saponified polyvinyl alcohol of 0 to 5,000 is preferably used, or a cation-modified polyvinyl alcohol having an average degree of polymerization of 400 to 5,000 having a cationic group in 0.01 to 25 mol% of all monomers is preferably used. From the viewpoint of printability and processability, the saponification degree is particularly 75 to 80%, and the average molecular weight is 10
A partially saponified polyvinyl alcohol having a molecular weight of 00 to 3000 is preferably used, or a cation-modified polyvinyl alcohol having a cationic group in 0.1 to 10 mol% of all monomers and having an average degree of polymerization of 1000 to 3000 is preferably used. The degree of saponification of the cation-modified polyvinyl alcohol is not particularly limited, but a degree of saponification of 65 to 90 mol% is preferably used.

The partially saponified polyvinyl alcohol in the present invention may be synthesized by a generally known method, and polyvinyl acetate is adjusted to a desired degree of saponification by an acid saponification method or an alkali saponification method. Things.

The cation-modified polyvinyl alcohol in the present invention refers to a polyvinyl alcohol having a cationic group such as a primary to tertiary amino group or a quaternary ammonium base in a main chain or a side chain. The cation-modified polyvinyl alcohol used in the present invention is obtained by polymerizing vinyl acetate as a raw material with hydroxyethyltrimethylammonium chloride, 2,3-dimethyl-1-vinylimidazolinium chloride, trimethyl- (3-acrylamide-3,3 -Dimethylpropyl) ammonium chloride, trimethyl- (3-methacrylamidopropyl) ammonium chloride, N-((1,1-dimethyl-3-dimethylaminopropyl) acrylamide, N- (3-dimethylaminopropyl) methacrylamide, etc. As described above, one or more vinyl monomers containing a quaternary ammonium salt (or a precursor group thereof, ie, a tertiary amino group), or o-, m-, p-aminostyrene or Monoalkyl or dialkyl derivatives or their quaternary
O-, m-, p-vinylbenzylamine or their monoalkyl or dialkyl derivatives or their quaternary ammonium salts; N- (vinylbenzyl)
N- (vinylbenzyl) piperidine; N-vinylpyrrolidone; α-, β-vinylpiperidine or a quaternary ammonium salt thereof; α-, β-piperidine or a quaternary ammonium salt thereof; -Vinyl acetate and other nitrogen-containing heterocyclic vinyl compounds such as vinyl quinoline or their quaternary ammonium salts, or a vinyl compound monomer which can be easily converted to a cationic group such as a nitro derivative thereof, and obtained by copolymerizing vinyl acetate. Obtained by saponifying the copolymer obtained by a conventional method. In addition, vinyl acetate is copolymerized with a monomer having another reactive group, and after the saponification, such a reactive group is used to react a cationic group-containing compound to cationize polyvinyl alcohol. Is also good. Further, a group capable of reacting with the hydroxyl group by utilizing a hydroxyl group in polyvinyl alcohol and a first group
Polyvinyl alcohol may be directly cationized using a compound having a tertiary amino group or a quaternary ammonium group at the same time, such as glycidyltrimethylammonium chloride.

These partially saponified polyvinyl alcohols may be used in a mixture of different degrees of polymerization and saponification, and the cation-modified polyvinyl alcohol may be used in combination of different degrees of polymerization and cation modification. May be. Further, these partially saponified polyvinyl alcohols and cation-modified polyvinyl alcohols may be mixed and used at an arbitrary ratio.

The surfactant (B) used in the present invention has an HLB value (Gri) based on its compatibility with a water-soluble resin or a water-dispersible resin.
ffin method: WC Griffin, Kirk-Othmer Encyclopedia of
Chemical Technology, 3rd.ed, Vol. 8, Weiley Inter
science, New York 1979, pp.900-930) requires 11 or more. If the HLB is less than 11, the compatibility with the water-soluble resin or the water-dispersible resin (dispersibility) is poor, so that the ink absorbing layer surface has irregularities, and the appearance of the paper tends to be impaired.
Also, the printed image tends to be poor. HLB is preferably 13.5 or more, more preferably 15.0 or more.

The surfactant (B) used in the present invention
Is an ester-based nonionic surfactant. The ester-based nonionic surfactant improves wettability with the ink and facilitates absorption of the ink into the ink absorbing layer. In particular, when polyvinyl alcohol is used for the water-soluble resin or the water-dispersible resin, the activator acts as a plasticizer for the polyvinyl alcohol, and also reduces the crystallinity of the polyvinyl alcohol, thereby increasing the ink absorbing ability. On the other hand, surfactants other than the ester-based nonionic surfactant improve the wettability with the ink, but do not have the effect of facilitating the absorption of the ink into the ink absorbing layer. As a result, the ink tends to spread laterally on the edge of the recording paper, and as a result, the ink that has not been absorbed into the recording paper comes into contact with each other, causing bleeding (the bleeding occurs more than the ink absorbing layer containing no activator). Often worsens).

Examples of the ester nonionic surfactant (B) having an HLB of 11 or more include polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monolaurate, and polyoxyethylene sorbitan monooleate. Eate, polyoxyethylene sorbitan trioleate, polyoxyethylene sorbite tetraoleate, polyoxyethylene monopalmitate, polyoxyethylene monostearate, polyoxyethylene monolaurate, polyoxyethylene monooleate, decaglycerin monostearic acid Esters, hexaglycerin monostearate, decaglycerin monooleate, hexaglycerin monooleate, decaglycerin monolaurate Le, hexaglycerin mono-laurate, decaglycerol mono-caprylate ester or hexaglycerin mono-caprylate esters. These surfactants can be used alone or in a mixture of two or more.

Among these surfactants, decaglycerin monolaurate, decaglycerin monocaprylate, and ethylene oxide addition moles are particularly preferred.
Polyoxyethylene sorbitan monolaurate of 17 moles or more, polyoxyethylene sorbitan monopalmitate with an ethylene oxide addition mole number of 18 moles or more, and polyoxyethylene monolaurate with an ethylene oxide addition mole number of 12 moles or more Is preferable because it is significantly improved.

The amount of the ester nonionic surfactant (B) having an HLB of 11 or more in the ink absorbing layer is 0.01 to 30 parts by weight based on 100 parts by weight of the water-soluble resin or the water-dispersible resin (A). Preferably 0.01 to 20 parts by weight, more preferably 0.1
To 10 parts by weight, particularly preferably 0.5 to 10 parts by weight. When the amount of the surfactant (B) is less than 0.01 part by weight, the effect of the surfactant is not exhibited, which is not preferable. When the amount is more than 30 parts by weight, printability and handleability (particularly stickiness resistance) are poor. Is not preferred.

The polyhydric alcohol (C) is blended for the purpose of preventing curling during storage due to the moisturizing effect (preventing the recording paper from curling due to moisture absorption and dehumidification of the ink absorbing layer) and improving the ink absorption speed. . It is considered that the improvement of the ink absorption rate is because the polyhydric alcohol acts as a plasticizer of the water-soluble resin or the water-dispersible resin, thereby facilitating the absorption of the ink. The effect of improving the printability is considerably small, and a surfactant is required).

The polyhydric alcohol (C) includes ethylene glycol, trimethylene glycol, tetramethylene glycol, pentamethylene glycol, hexamethylene glycol, propylene glycol, glycerin, 2,3-
Butanediol, 1,3-butanediol, diethylene glycol, triethylene glycol, diethanolamine, triethanolamine, trimethylolpropane,
Examples include pentaerythritol, sorbitol, and polyglycerin having a degree of polymerization of 2 or more. Among these, in particular, when one or more selected from the group consisting of ethylene glycol, glycerin, trimethylene glycol, tetramethylene glycol, propylene glycol, diethylene glycol, and a polyglycerin having a degree of polymerization of 2 or more, adhesion to the substrate is obtained. The effect on printability is large and preferable.

Polyhydric alcohol blended in ink absorbing layer
The compounding amount of (C) is 0.01 to 30 parts by weight, preferably 0.1 to 20 parts by weight, more preferably 0.5 to 10 parts by weight based on 100 parts by weight of the water-soluble resin or the water-dispersible resin (A). If the polyhydric alcohol is less than 0.01 parts by weight, the effect of the polyhydric alcohol is not exhibited, which is not preferable. If the polyhydric alcohol is more than 30 parts by weight, printability and handleability (especially stickiness resistance)
Is not preferred because it becomes worse.

Crosslinked silicone particles having a particle size of 0.5 to 50 μm
(D) is compounded for the purpose of a release agent effect (prevention of stickiness and prevention of adhesion between recording papers), and a small amount of the compound exhibits the release agent effect and does not adversely affect printability. Further, it is preferably used because it has good dispersion stability in a coating liquid and has little sedimentation even when stored for a long time.

The composition of the crosslinked silicone particles (D) is S
SiO ₂ , CH ₃ SiO _3/2 , (CH ₃ ) SiO, (CH ₃ ) ₃ SiO
Methyl silicone resin composed of a combination of _1/2 structural units, CH ₃ SiO _3/2 , (CH ₃ ) ₂ SiO, C ₆ H ₅ Si
O _3/2 , (C ₆ H ₅ ) (CH ₃ ) SiO, methylphenyl silicone resin formed by combining structural units of (C ₆ H ₅ ) ₂ SiO, and alkyd-modified, polyester-modified, acrylic-modified, epoxy Modified, phenol-modified, urethane-modified, melamine-modified silicone resins and the like. The silicone content in these modified silicone resins is not particularly limited as long as the characteristics of silicone are exhibited, and the silicone content is 5% by weight.
The content is preferably at least 15% by weight, more preferably at least 50% by weight.

In addition, dimethyl-based, methylvinyl-based, methylphenylvinyl-based, and methylfluoroalkyl-based silicone crosslinked rubbers can also be mentioned as favorable materials. These rubbers may contain fillers such as silica particles.

In particular, polymethylsilsesquioxane (polymethylsilsesquioxane) is preferred because of its tackiness and dispersion stability in a coating solution.
silsesquioxane, Chemical Abstracts No. 68554-70-
1) is preferably used.

The shape of the crosslinked silicone particles (D) is as follows:
There are various types such as a spherical shape and a pulverized shape, but there is no particular limitation. Although the particle size depends on the thickness of the ink absorbing layer (it is preferable to use particles having a particle size larger than the thickness of the ink absorbing layer to impart stickiness), the particle size is in the range of 0.5 to 50 μm. However, it is preferable from the viewpoint of handleability and coating property,
If it exceeds 50 μm, an appropriate dot shape cannot be obtained.

The particle size of the ink absorbing layer is 0.5 to 50 μm
The amount of the crosslinked silicone particles (D) is 0.01 to 30 parts by weight, preferably 0.1 to 10 parts by weight, more preferably 0.3 to 5 parts by weight, based on 100 parts by weight of the water-soluble resin or the water-dispersible resin (A). Department. When the amount of the crosslinked silicone particles is less than 0.01 part by weight, the effect of the crosslinked silicone particles is not exhibited, and when the amount is more than 30 parts by weight, the printability deteriorates.

As the method for blending the crosslinked silicone particles (D), for example, a method in which particles are blended into a coating liquid for forming an ink absorbing layer and then applied, or a method in which a coating liquid containing no particles is coated is applied. After the process, a method of spraying particles is exemplified.

Further, in the present invention, when a layered silicate (E) (hereinafter, referred to as an organic clay composite) modified with an organic treating agent is added to the ink absorbing layer, the printability is improved. The layered silicate as a raw material is a layered silicate having a specific property of having a cation exchange ability and further swelling by taking in water between layers, and examples thereof include smectite-type clay and swellable mica. For example, smectite clays include hectorite, saponite, stevensite, beidellite,
Montmorillonite, nontronite, natural or chemically synthesized such as bentonite, or a substitute thereof,
Derivatives or mixtures thereof can be mentioned. Further, as the swellable mica, Li-type fluorine teniolite, Na-type fluorine teniolite, Na-type tetrasilicon fluorine mica,
Natural or chemically synthesized swelling mica such as Li-type tetrasilicon mica, swelling mica having Li ion or Na ion between layers,
Or a substituted product, a derivative thereof, or a mixture thereof, and vermiculite, fluorine vermiculite, and the like can also be used. The smectite clay and the swellable mica used in the present invention can be obtained by the method described in JP-A-6-287014.

Examples of the organic treating agent for the layered silicate include a compound represented by the following general formula (1).

[0032]

Embedded image

[Wherein at least one of the four substituents R ^{1 to} R ⁴ is a (CH ₂ CH ₂ O) _n H group or

[0034]

Embedded image

Wherein n is a positive number from 1 to 50, and the remaining substituents are linear or branched alkyl groups having 1 to 10 carbon atoms or hydrogen. Further X ^- is _{^{Cl -, Br -, NO 3}} -, OH - or CH ₃ COO ^- it is. Among these, polyoxyethylene diethylmethylammonium chloride and polyoxypropylene diethylmethylammonium chloride are preferred, and polyoxypropylene diethylmethylammonium chloride is particularly preferred because of its large effect on printability.

The method for producing the organoclay composite using the above-mentioned raw materials is not particularly limited, but is disclosed in JP-A-6-28701.
It can be produced with reference to the method described in Japanese Patent Publication No. 4 and the like. The particle size of the organoclay composite used in the present invention is 50 μm
These are: If it is larger than 50 μm, the effect on printability is not seen, which is not preferable.

When the organoclay composite is blended in the ink absorbing layer, the amount of the organoclay composite is 0.01 to 50 parts by weight based on 100 parts by weight of the water-soluble resin or water-dispersible resin (A) in the ink absorbing layer.
Parts by weight, preferably 0.1 to 30 parts by weight, more preferably 0.5 to 30 parts by weight.
~ 20 parts by weight. Although a recording paper having good printability can be obtained without blending the organoclay composite in the ink absorbing layer, it is preferable to blend the organoclay composite in the above range in the ink absorbing layer, because the printability is further improved.

The effect of the compounding of the organoclay composite is particularly remarkable for ink using an acid dye. It is considered that, since the organic treating agent is a cationic material, the organic clay complex forms an ionic bond with the acid dye, and the fixing property is enhanced.

Further, in the ink absorbing layer, inorganic particles, hydrophobic organic particles, preservatives, defoamers, coating improvers, thickeners, antioxidants, ultraviolet absorbers are provided as long as the printability is not impaired. , A humectant and the like can be used in combination. For example, as inorganic particles, silica, clay, talc, diatomaceous earth, calcium carbonate, barium sulfate, aluminum silicate, synthetic zeolite, alumina, alumina hydrate, zinc oxide, mica, etc., as hydrophobic organic particles, Non-crosslinked or crosslinked products such as (meth) acrylic resin, styrene resin, polyester resin, polyolefin resin, polyamide resin, polycarbonate resin, etc. are mentioned.
The amount is preferably 0.01 to 100 μm, and the amount is 0.01 to 20 parts by weight, preferably 0.1 to 10 parts by weight, per 100 parts by weight of the water-soluble resin or the water-dispersible resin (A).

The thickness of the ink absorbing layer is not particularly limited, but may be a base paper such as JIS Handbook 38 (paper / paper).
Pulp, 1994) pp. 38-55, at least on one side on paper, from the viewpoint of printability and handleability, from about 0.1 to 200 μm, preferably from about 1 to 100 μm, more preferably from 3 to 50 μm.
Providing about μm is preferable because good printability is obtained.

The structure of the recording paper is not particularly limited as long as the ink absorbing layer is provided on the uppermost layer. The recording paper may be provided with a single layer of the ink absorbing layer on the base paper. A water-soluble resin or a water-dispersible resin (A) and a polyhydric alcohol (C) as an intermediate layer between the ink absorbing layer, and
The mixing ratio of the component (A) and the component (C) is (A) :( C) = 100: 0 to 30
A layer (intermediate layer) that is (weight ratio) may be provided. This intermediate layer has the effect of increasing the absorption capacity of the aqueous ink.

As the water-soluble resin or water-dispersible resin (A) and the polyhydric alcohol (C) used in the intermediate layer, the same ones as described above are used. These intermediate layers may be two or more layers. The intermediate layer may contain inorganic particles, organic particles, a preservative, an antifoaming agent, a coating improver, a thickener, an antioxidant, an ultraviolet absorber, and the like, as long as the printability is not impaired. . As a material used for the intermediate layer, the saponification degree is particularly high.
Use of polyvinyl alcohol having an average degree of polymerization of from 400 to 5,000 and an average degree of polymerization of from 400 to 5,000 is preferred from the viewpoint of processability and printability.

The method for forming such an ink absorbing layer and the intermediate layer is not particularly limited, but the above composition is dissolved in an appropriate solvent, and a gravure coating method, a reverse coating method, a kiss coating method, a die coating method, a bar coating method are used. A known method such as that described above may be applied on the base paper, and then dried immediately. Further, a machine calender, a super calender treatment, or the like may be performed to increase the surface smoothness.

When the intermediate layer is provided, the coating thickness of the intermediate layer and the ink absorbing layer is not particularly limited, but the thickness of the intermediate layer is 1 to 50 μm, preferably 5 to 20 μm from the viewpoint of handleability. , The ink absorption layer is 0.01 to 30 μm, preferably 0.5 to 10
μm. Also, of course, the ink absorbing layer,
Some of the components of the intermediate layer may be impregnated in the base paper.

[0045]

According to the recording paper of the present invention, by providing an ink absorbing layer containing a specific surfactant and a water-soluble resin or a water-dispersible resin, the wettability with an aqueous ink and the ink absorbing ability can be improved. As a result, the ink exhibits very excellent print quality and ink drying properties after printing. This can be preferably used in applications such as recording paper for inkjet printers, offset printing, and flexographic printing.

[0046]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments. First, a method for measuring print characteristics according to the present invention will be described. Mach Jet Printer MJ manufactured by EPSON Corporation
Using -700V2C, a pattern was printed, the print quality and ink absorbency (quick drying) were evaluated, and the recordability was determined as follows. The print quality was evaluated by visual observation with a magnifying glass, and the ink absorbency was evaluated immediately after printing by rubbing the pattern once with a finger to evaluate the degree of contamination of the ink absorbing layer with the ink. Printing quality ：: very good (dots are uniform and clear) ：: good ：: slightly poor ×: dot flow, repelling, bleeding Ink absorbency ：: very good (the ink absorbing layer is not stained) ：: Good Δ: Slightly poor ×: Ink flows and the ink absorbing layer is stained.

<Examples 1 to 4> Base paper (NP manufactured by Kao Corporation)
A coating having the following composition was coated on one side of the sheet (P paper) and dried with hot air at 120 ° C. for 5 minutes to form a coating film having a thickness of about 5 μm. Table 1 shows the recording characteristics of the recording paper having these compositions. The upper layer is an ink absorbing layer.

(Example 1)-Intermediate layer: polyvinyl alcohol 10.0 g (Kuraray Co., Ltd .: PVA217, degree of saponification = about 88 mol%, average degree of polymerization = about 1700) Deionized water 90.0 g Coating of intermediate layer Film thickness: 2.7 μm-Upper layer: polyvinyl alcohol (Kuraray Co., Ltd .: PVA217) 10.0 g Polyoxyethylene sorbitan monopalmitate 1.2 g (Kao Co., Ltd .: Leodol TW-P120, HLB = 15.6) Ion-exchanged water 88.8 g Coating thickness of upper layer: 2.2 μm (Example 2)-Intermediate layer: polyvinyl alcohol 10.0 g (manufactured by Kuraray Co., Ltd .: PVA235, degree of saponification = about 88 mol%, average degree of polymerization = about 1700) Exchange water 90.0 g Coating thickness of intermediate layer: 1.5 μm-Upper layer: polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA235) 10.0 g Polyoxyethylene sorbitan monostearate 1.8 g (manufactured by Kao Corporation: Leodol TW-S120) , HLB = 14.9) Ion Exchange water 88.2 g Upper layer coating thickness: 2.1 μm (Example 3) ・ Intermediate layer: hydroxypropylcellulose 10.0 g (Nippon Soda Co., Ltd .: SSL) Deionized water 90.0 g Intermediate layer coating thickness: 1.2 μm ・ Upper layer: polyvinyl alcohol (Kuraray Co., Ltd .: PVA217) 10.0 g Polyoxyethylene sorbitan trioleate 0.7 g (Kao Co., Ltd .: Reodol TW-O320, HLB = 11.0) Ion exchange water 89.3 g Upper layer coating film Thickness: 1.6 μm (Example 4) ・ Intermediate layer: polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA217) 10.0 g Deionized water 90.0 g Coating thickness of intermediate layer: 1.1 μm ・ Upper layer: polyvinyl alcohol ((Co., Ltd.) ) Kuraray: PVA217) 10.0 g Polyoxyethylene sorbitan monopalmitate 1.2 g (Kao Corporation: Reodol TW-P120, HLB = 15.6) Polyoxypropyl diethylmethylammonium chloride-modified skin Tight 0.1 g (prepared according to Example 1 of JP-A-6-287014, and the average particle diameter after coating is measured by a transmission electron microscope = about 0.12 μm) Ion-exchanged water 88.7 g Upper coating film thickness Sa: 3.2 μm <Comparative Examples 1 to 6> A coating having the following composition is applied on one surface of a base paper (NPP paper manufactured by Kao Corporation) and dried with hot air at 120 ° C. for 5 minutes to obtain about 5 μm. Was prepared. Table 1
2 also shows the recording characteristics of the recording paper having these compositions. The upper layer is an ink absorbing layer.

(Comparative Example 1) Single layer: polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA217) 10.0 g Deionized water 90.0 g Single layer coating thickness: 4.4 μm (Comparative Example 2) Intermediate layer: polyvinyl Alcohol (Kuraray Co., Ltd .: PVA217) 10.0 g Ion-exchanged water 90.0 g Coating thickness of the intermediate layer: 2.9 μm-Upper layer: polyvinyl alcohol (Kuraray Co., Ltd .: PVA217) 10.0 g Polyoxyethylene lauryl ether 1.5 g (Kao Corporation: Emulgen 108, HLB = 12.1) Ion-exchanged water 88.5 g Upper layer coating thickness: 2.3 μm (Comparative Example 3) ・ Intermediate layer: polyvinyl alcohol (Kuraray Co., Ltd .: PVA217) 10.0 g Ion-exchanged water 90.0 g Coating thickness of intermediate layer: 3.2 μm Upper layer: polyvinyl alcohol (Kuraray Co., Ltd .: PVA217) 10.0 g Lauryltrimethylammonium chloride 1.2 g (Kao Co., Ltd .: Cotamine 24P) 88.8 g of ion-exchanged water Thickness of the upper layer: 1.0 μm (Comparative Example 4) ・ Intermediate layer: 10.0 g of polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA217) 90.0 g of ion-exchanged water Thickness of the intermediate layer: 4.5 μm ・ Upper layer: polyvinyl alcohol (Kuraray Co., Ltd .: PVA217) 10.0 g Lauryl betaine 1.2 g (Kao Corporation: Amphitol 24B) Deionized water 88.8 g Upper layer coating thickness: 2.1 μm (Comparative Example 5) -Intermediate layer: polyvinyl alcohol (Kuraray Co., Ltd .: PVA217) 10.0 g Deionized water 90.0 g Coating thickness of the intermediate layer: 3.6 µm-Upper layer: polyvinyl alcohol (Kuraray Co., Ltd .: PVA217) 10.0 g Polyoxy 5.0 g of ethylene sorbitan monopalmitate (manufactured by Kao Corporation: Rheodol TW-P120, HLB = 15.6) 85.0 g of ion-exchanged water Thickness of upper layer coating: 1.3 μm (Comparative Example 6) Intermediate layer: polyvinyl alcohol (( Kuraray Co., Ltd .: PVA2 17) 10.0 g Ion-exchanged water 90.0 g Coating thickness of intermediate layer: 4.1 μm-Upper layer: polyvinyl alcohol (Kuraray Co., Ltd .: PVA217) 10.0 g Polyoxyethylene sorbitan monopalmitate 0.0005 g (Kao Co., Ltd.) : Rheodol TW-P120, HLB = 15.6) Deionized water 89.9995g Upper coating thickness: 0.9μm

[0050]

[Table 1]

<Examples 5 to 11> A coating having the following composition was applied on one side of a base paper (postcard made by government) and dried with hot air at 120 ° C. for 5 minutes to form a coating film having a thickness of 3 μm. Produced. Table 2
The recording characteristics of the recording paper having these compositions are shown in FIG.

Example 5 10.0 g of partially saponified polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA417, degree of saponification = about 78 mol%, average degree of polymerization = about 1700) Polyoxyethylene sorbitan monopalmitate 0.5 g (manufactured by Kao Corporation: Rheodol TW-P120, HLB = 15.6)-89.5 g of ion-exchanged water (Example 6)-10.0 g of partially saponified polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA217, degree of saponification = approx. 88 mol%, average degree of polymerization = about 1700) 1.2 g of polyoxyethylene sorbitan monostearate (manufactured by Kao Corporation: Rheodol TW-S120, HLB = 14.9)-88.8 g of ion-exchanged water (Example 7)-Cation Modified polyvinyl alcohol 10.0 g (Kuraray Co., Ltd .: PVA C-318, degree of saponification = about 88 mol%, degree of cation modification = about 0.2 mol%, average degree of polymerization = about 1800)-Polyoxyethylene sorbitan monopalmitate 0.2 g (Kao Corporation: Leodol TW-P120, HLB = 15.6) ・ Ion exchange water 89.8 g (Example 8) ・ Cation-modified polyvinyl alcohol 10.0 g (Kuraray Corporation: PVA CM-318, saponified) Degree = about 88 mol%, degree of cation modification = about 2 mol%, average degree of polymerization = about 1800) Polyoxyethylene sorbitan trioleate 0.7 g (manufactured by Kao Corporation: Reodol TW-O320, HLB = 11.0) Exchanged water 89.3 g (Example 9) ・ Partially saponified polyvinyl alcohol (Kuraray Co., Ltd .: PVA417) 10.0 g ・ Polyoxyethylene sorbitan monopalmitate 0.3 g (Kao Co., Ltd .: Rheodol TW-P120) ・ Poly 0.1 g of oxypropylene diethylmethylammonium chloride-modified smectite (prepared according to Example 1 of JP-A-6-287014, and the average particle diameter after coating was measured with a transmission electron microscope = about 0.12 μm -89.6 g of ion-exchanged water (Example 10)-10.0 g of partially saponified polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA417)-0.3 g of polyoxyethylene sorbitan monopalmitate (manufactured by Kao Corporation: Leodol TW-P120)-Glycerin 0.2 g ・ Ion-exchanged water 89.5 g (Example 11) ・ Partially saponified polyvinyl alcohol (Kuraray Co., Ltd .: PVA417) 10.0 g ・ Polyoxyethylene sorbitan monopalmitate 0.3 g (Kao Co., Ltd .: Leodol TW-) P120)-Polyoxypropylene diethylmethylammonium chloride-modified smectite 0.1 g (prepared according to Example 1 of JP-A-6-287014, and the average particle diameter after coating was measured with a transmission electron microscope = about 0.12 µm・ Glycerin 0.2g ・ Ion-exchanged water 89.4g <Comparative Examples 7 to 13> A coating having the following composition was applied on one surface of a base paper (postcard made by government), and heated at 120 ° C. Minutes by hot air drying, to prepare a coating film having a thickness of 3 [mu] m. Table 2 also shows the recording characteristics of the recording paper having these compositions.

(Comparative Example 7) • Partially saponified polyvinyl alcohol (Kuraray Co., Ltd .: PVA417) 10.0 g • Deionized water 90.0 g (Comparative Example 8) • Cation-modified polyvinyl alcohol (Kuraray Co., Ltd .: PVA C) -318) 10.0 g ・ Ion-exchanged water 90.0 g (Comparative Example 9) ・ Partially saponified polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA417) 10.0 g ・ Polyoxyethylene lauryl ether 1.0 g (manufactured by Kao Corporation: Emulgen 108) , HLB = 12.1) ・ Ion-exchanged water 89.0 g (Comparative Example 10) ・ Partially saponified polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA217) 10.0 g ・ Lauryltrimethylammonium chloride 1.0 g (Kao Co., Ltd .: Cotamine 24P)・ Ion-exchanged water 89.0 g (Comparative Example 11) ・ Cation-modified polyvinyl alcohol (Kuraray Co., Ltd .: PVA-318) 10.0 g ・ Lauryl betaine (Kao Co., Ltd .: A) Hitol 24B) 1.0 g ・ Ion-exchanged water 89.0 g (Comparative Example 12) ・ Partially saponified polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA417) 10.0 g ・ Polyoxyethylene sorbitan monopalmitate 0.0005 g (Kao Co., Ltd .: 89.9995 g of ion-exchanged water (Comparative Example 13) 10.0 g of partially saponified polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA417) 5.0 g of polyoxyethylene sorbitan monopalmitate 5.0 g (manufactured by Kao Corporation: REODOL TW-P120) ・ Ion exchange water 85.0g

[0054]

[Table 2]

<Examples 12 to 14> A coating having the following composition was applied to one surface of a base paper (Kent paper manufactured by KOKUYO Co., Ltd.)
And dried with hot air for 5 minutes to produce a coating film having a thickness of 5 μm. Table 3 shows the recording characteristics of the recording paper having these compositions.

(Example 12) 10.0 g of partially saponified polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA217, degree of saponification = about 88 mol%, average degree of polymerization = about 1700) 0.3 g of polyoxyethylene monolaurate (Manufactured by Kao Corporation: Emanone 1112, HLB = 13.7)-0.7 g of glycerin-89.0 g of ion-exchanged water (Example 13)-10.0 g of partially saponified polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA417, degree of saponification = Polyoxyethylene monooleate 0.4 g (Kao Corporation: Emanone 4110, HLB = 11.6) Ethylene glycol 0.1 g Ion exchange water 89.5 g (Example 14)・ Partially saponified polyvinyl alcohol 10.0 g (Kuraray Co., Ltd .: PVA217) ・ Polyoxyethylene monolaurate 0.3 g (Kao Co., Ltd .: Emanone 1112) ・ Glycerin 0.7 g ・ Polyoxypropyl 0.1 g of diethylmethylammonium chloride-modified smectite (prepared according to Example 1 of JP-A-6-287014, and the average particle diameter after coating is measured by a transmission electron microscope = about 0.12 μm). g <Comparative Examples 14 to 17> A coating having the following composition was applied to one surface of a base paper (Kent paper manufactured by KOKUYO Co., Ltd.) and dried with hot air at 120 ° C. for 5 minutes to obtain a coating having a thickness of 3 μm. A film was prepared. Table 3
2 also shows the recording characteristics of the recording paper having these compositions.

(Comparative Example 14) 10.0 g of partially saponified polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA217) 1.0 g of polyoxyethylene lauryl ether (manufactured by Kao Corporation: Emulgen 108, HLB = 12.1) Glycerin 0.7 g ・ Ion-exchanged water 88.3 g (Comparative Example 15) ・ Cation-modified polyvinyl alcohol (Kuraray Co., Ltd .: PVA-318) 10.0 g ・ Lauryl betaine (Kao Co., Ltd .; Amphitol 24B) 1.0 g ・ Ethylene glycol 0.5 g ・ Ion-exchanged water 88.5 g (Comparative Example 16) ・ Partially saponified polyvinyl alcohol (Kuraray Co., Ltd .: PVA217) 10.0 g ・ Polyoxyethylene monolaurate 0.0005 g (Kao Co., Ltd .: Emanone 1112) ・ Glycerin 0.7 g ・ Ion-exchanged water 89.2995 g (Comparative Example 17) ・ Partially saponified polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA217) 10.0 g ・ Polyoxyethylene mono Ureto 5.0g (Kao Co., Ltd.: Emanon 1112) Glycerin 0.7g · ion exchange water 84.3g

[0058]

[Table 3]

<Examples 15 to 36> A coating having the following composition was applied to one surface of a base paper (postcard made by government) and dried with hot air at 120 ° C. for 5 minutes to form a coating film having a thickness of 5 μm. did. Table 4
The recording characteristics of the recording paper having these compositions are shown in FIG.

(Example 15) 10.0 g of partially saponified polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA417, degree of saponification = about 78 mol%, average degree of polymerization = about 1700) Decaglycerin monocaprylate 0.5 g (Maka-750, HLB = 16, manufactured by Sakamoto Pharmaceutical Co., Ltd.) 89.5 g of ion-exchanged water (Example 16) 10.0 g of cation-modified polyvinyl alcohol (Kuraray Co., Ltd .: PVA CM-318, degree of saponification) = About 88 mol%, degree of cationic modification = about 2 mol%, average degree of polymerization = about 1800) 1.2 g of polyoxyethylene sorbitan monopalmitate (manufactured by Kao Corporation: Rheodol TW-P120, HLB = 15.6) 88.8 g of exchanged water (Example 17) 10.0 g of partially saponified polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA417) 0.5 g of decaglycerin monocaprylate (MCA-750, HLB = manufactured by Sakamoto Pharmaceutical Co., Ltd.) 16) ・ Glycerin (Kao ( Ltd .: purified glycerin) 0.5 g ・ Ion-exchanged water 89.0 g (Example 18) ・ Cation-modified polyvinyl alcohol (Kuraray Co., Ltd .: PVA CM-318) 10.0 g ・ Polyoxyethylene monolaurate 0.1 g (Kao (Manufactured by: Emanon 1112, HLB = 13.7)-Ethylene glycol (manufactured by Wako Pure Chemical Industries, Ltd.) 1.2 g-Deionized water 88.7 g (Example 19)-Partially saponified polyvinyl alcohol 10.0 g (Kuraray Co., Ltd.) Manufactured by: PVA217, degree of saponification = about 88 mol%, average degree of polymerization = about 1700) ・ Decaglycerin monocaprylate 0.7 g (manufactured by Sakamoto Pharmaceutical Co., Ltd .: MCA-750) ・ Decaglycerin 0.1 g ・ Ion exchange 89.2 g of water (Example 20) ・ Partially saponified polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA417) 10.0 g ・ Decaglycerin monocaprylate 0.5 g (manufactured by Sakamoto Pharmaceutical Co., Ltd .: MCA-750) ・ Silicone particles 0.05 g (manufactured by Toshiba Silicone Co., Ltd .: Tospearl 3120, average particle size = about 18 μm) ・ Ion-exchanged water 89.45 g (Example 21) ・ Partially saponified polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA217) 8.0 g ・ alginic acid Sodium (100 cps, manufactured by Hanoi Chemical Co., Ltd.) 2.0 g ・ Decaglycerin monolaurate 0.6 g (manufactured by Sakamoto Pharmaceutical Co., Ltd .: ML-750, HLB = 15) ・ Silicone particles 1.0 g (manufactured by Toshiba Silicone Co., Ltd.) : Tospearl 5H08, average particle size = about 6.5 μm)-Ion-exchanged water 88.4 g (Example 22)-Partially saponified polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA417) 10.0 g-Polyoxyethylene monolaurate 0.1 g ( Kao Corporation: Emanon 1112) Silicone particles (Toshiba Silicone Co., Ltd .: Tospearl 3120) 0.02 g Deionized water 89.88 g (Example 23) Partially saponified polyvinyl alcohol (Manufactured by Kuraray Co., Ltd .: PVA417) 10.0 g ・ Decaglycerin monocaprylate 0.5 g (manufactured by Sakamoto Pharmaceutical Co., Ltd .: MCA-750) ・ Glycerin (manufactured by Kao Corporation: purified glycerin) 0.5 g ・ Silicone particles (Manufactured by Toshiba Silicone Co., Ltd .: Tospearl 3120) 0.05 g ・ ion-exchanged water 88.95 g (Example 24) ・ partially saponified polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA217) 10.0 g ・ decaglycerin monolaurate 1.0 g ( Sakamoto Pharmaceutical Co., Ltd .: ML-750, HLB = 15) ・ Hexaglycerin (Sakamoto Pharmaceutical Co., Ltd .: polyglycerin # 500) 0.3 g ・ Silicone particles (Toshiba Silicone Co., Ltd .: Tospearl 3120) 0.06 g ・ Ion-exchanged water 88.64 g (Example 25) ・ Cation-modified polyvinyl alcohol 10.0 g (Kuraray Co., Ltd .: PVA CM-318) ・ Polyoxyethylene monolaurate 0.1 g (Kao (Manufactured by: Emanon 1112) 0.5 g ethylene glycol (manufactured by Wako Pure Chemical Industries, Ltd.) 0.1 g silicone particles (manufactured by Toshiba Silicone Co., Ltd .: Tospearl 5H08) 0.19 g ion-exchanged water (Example 26) Partially saponified polyvinyl alcohol (Kuraray Co., Ltd .: PVA217) 10.0 g ・ Polyoxyethylene sorbitan monopalmitate 0.8 g (Kao Co., Ltd .: Reodol TW-P120, HLB = 15.6) ・ Polyoxypropylene diethylmethylammonium chloride Modified smectite 0.01 g (prepared according to Example 1 of JP-A-6-287014, and measured the average particle size after coating with a transmission electron microscope = about 0.12 μm)-89.19 g of ion-exchanged water (Example 27) ・ Partially saponified polyvinyl alcohol (Kuraray Co., Ltd .: PVA417) 10.0 g ・ Decaglycerin monocaprylate 1.0 g (Sakamoto Pharmaceutical Co., Ltd .: MCA-7 50) ・ Polyoxypropylene diethylmethylammonium chloride-modified smectite 0.1 g (prepared according to Example 1 of JP-A-6-287014, and the average particle diameter after coating was measured with a transmission electron microscope = about 0.12 μm)・ Ion-exchanged water 88.9 g (Example 28) ・ Partially saponified polyvinyl alcohol (Kuraray Co., Ltd .: PVA417) 10.0 g ・ Polyoxyethylene sorbitan monopalmitate 0.8 g (Kao Co., Ltd .: Leodol TW-P120) , HLB = 15.6)-Glycerin (purified glycerin, manufactured by Kao Corporation) 0.5 g-Polyoxypropylene diethylmethylammonium chloride-modified smectite 0.01 g (prepared and coated according to Example 1 of JP-A-6-287014) (The average particle size after measurement was measured with a transmission electron microscope = about 0.12 μm) ・ 88.66 g of ion-exchanged water (Example 29) ・ Partially saponified polyvinyl alcohol (Kuraray Co., Ltd .: PVA417) 10.0 g ・ Decaglycerin monocaprylate 1.0 g (Sakamoto Pharmaceutical Co., Ltd .: MCA-750) ・ Ethylene glycol (Wako Pure Chemical Industries, Ltd.) 0.2 g ・ Polyoxy Propylene diethyl methyl ammonium chloride-modified smectite 0.01 g (prepared according to Example 1 of JP-A-6-287014, and the average particle diameter after coating is measured with a transmission electron microscope = about 0.12 μm) 88.79 g (Example 30) ・ Partially saponified polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA417) 10.0 g ・ Polyoxyethylene sorbitan monopalmitate 0.8 g (manufactured by Kao Corporation: Leodol TW-P120, HLB = 15.6)・ Silicone particles (Toshiba Silicone Co., Ltd .: Tospearl 3120) 0.05 g ・ Polyoxypropylene diethylmethylammonium chloride-modified smectite 0.01 g ( The average particle size after preparation and coating according to Example 1 of Kaihei 6-287014 is measured by a transmission electron microscope = about 0.12 μm)-89.14 g of ion-exchanged water (Example 31)-Partial saponification Polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA417) 10.0 g ・ Decaglycerin monocaprylate 1.0 g (manufactured by Sakamoto Pharmaceutical Co., Ltd .: MCA-750) ・ Silicone particles (manufactured by Toshiba Silicone Co., Ltd .: Tospearl 3120) 0.05 g-Polyoxypropylene diethylmethylammonium chloride-modified smectite 0.01 g (prepared according to Example 1 of JP-A-6-287014, and the average particle diameter after coating is measured with a transmission electron microscope = about 0.12 µm) -88.94 g of ion-exchanged water (Example 32)-10.0 g of cation-modified polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA CM-318)-1.0 g of decaglycerin monocaprylate 1.0 g (Sakamoto Pharmaceutical Co., Ltd.) Glycerin (Kao Corporation: purified glycerin) 0.5 g Silicone particles (Toshiba Silicone Co., Ltd .: Tospearl 3120) 0.05 g Polyoxypropylene diethylmethylammonium chloride-modified smectite 0.01 g (prepared according to Example 1 of JP-A-6-287014, and measured the average particle diameter after coating with a transmission electron microscope = about 0.12 μm) ・ 88.44 g of ion-exchanged water (Example 33) Partially saponified polyvinyl alcohol (Kuraray Co., Ltd .: PVA417) 10.0 g ・ Decaglycerin monocaprylate 1.0 g (Sakamoto Pharmaceutical Co., Ltd .: MCA-750) ・ Ethylene glycol (Wako Pure Chemical Industries, Ltd.) 0.2 g ・ Silicone particles (Tospearl 3120: Tospearl 3120) 0.05 g ・ Polyoxypropylene diethylmethylammonium chloride modified smectite 0.05 (The average particle size after preparation and application according to Example 1 of JP-A-6-287014 is measured with a transmission electron microscope = about 0.12 μm) ・ 88.7 g of ion-exchanged water (Example 34) ・ Parts Saponified polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA417) 10.0 g ・ Polyoxyethylene sorbitan monopalmitate 0.1 g (manufactured by Kao Corporation: Leodol TW-L120, HLB = 16.7) ・ Glycerin (manufactured by Kao Corporation): Purified glycerin) 1.0 g ・ Silicone particles (Tosiba Silicone Co., Ltd .: Tospearl 3120) 0.05 g ・ Polyoxypropylene diethylmethylammonium chloride-modified smectite 0.01 g (prepared according to Example 1 of JP-A-6-287014) (Measurement of average particle diameter after coating with a transmission electron microscope = about 0.12 μm) ・ 88.84 g of ion-exchanged water (Example 35) Intermediate layer; 2 μm ・ Partially saponified polyvinyl alcohol ((Co. ) Kuraray: PVA217) 10.0 g ・ Ion-exchanged water 90.0 g Ink absorption layer: 3 μm ・ Partially saponified polyvinyl alcohol (Kuraray: PVA417) 10.0 g ・ Decaglycerin monocaprylate 0.5 g (Sakamoto Yakuhin Kogyo Co., Ltd.) MCA-750) ・ Glycerin (Kao Corporation: purified glycerin) 0.5 g ・ Silicone particles (Toshiba Silicone Co., Ltd .: Tospearl 3120) 0.05 g ・ Ion-exchanged water 88.95 g (Example 36) Intermediate Layer: 3 μm ・ Partially saponified polyvinyl alcohol (Kuraray Co., Ltd .: PVA417) 10.0 g ・ Glycerin (Kao Corporation: purified glycerin) 7.0 g ・ Ion-exchanged water 83.0 g Ink absorption layer; 2 μm ・ Partially saponified polyvinyl Alcohol (manufactured by Kuraray Co., Ltd .: PVA417) 10.0 g ・ Polyoxyethylene sorbitan monopalmitate 0.8 g (manufactured by Kao Corporation: Leodol TW-P120, HLB = 15.6) ・ Si Corn particles (Toshiba Silicone Co., Ltd .: Tospearl 3120) 0.05 g Polyoxypropylene diethylmethylammonium chloride-modified smectite 0.01 g (average particles after preparation and coating according to Example 1 of JP-A-6-287014) Measure the diameter with a transmission electron microscope = approx. 0.12 μm)-89.14 g of ion-exchanged water

[0061]

[Table 4]

<Comparative Examples 18 to 21> A coating having the following composition was applied to one side of a base paper (postcard made by government) and dried with hot air at 120 ° C. for 5 minutes to form a coating film having a thickness of 3 μm. did. Table 5
The recording characteristics of the recording paper having these compositions are shown in FIG.

(Comparative Example 18) 10.0 g of partially saponified polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA417) 1.0 g of sorbitan monooleate (manufactured by Kao Corporation: Reodol SP-O10, HLB = 4.3) Exchanged water 89.0 g (Comparative Example 19) ・ Partially saponified polyvinyl alcohol (Kuraray Co., Ltd .: PVA217) 10.0 g ・ Polyoxyethylene sorbitan monopalmitate 0.0005 g (Kao Co., Ltd .: Rheodol TW-P120, HLB = 15.6) ・ Ion-exchanged water 89.9995 g (Comparative Example 20) ・ Partially saponified polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA217) 10.0 g ・ Polyoxyethylene sorbitan monopalmitate 4.0 g (Kao Corporation: Leodol TW- P120, HLB = 15.6) ・ Ion-exchanged water 86.0 g (Comparative Example 21) ・ Partially saponified polyvinyl alcohol (manufactured by Kuraray Co., Ltd .: PVA217) 10.0 g ・ Glycerin (manufactured by Kao Corporation: Purification Group) Serine) 1.0g · ion exchange water 89.0g

[0064]

[Table 5]

Claims (9)

[Claims] An ink absorbing layer comprising a water-soluble resin or a water-dispersible resin (A) and an ester nonionic surfactant (B) having an HLB of 11 or more is provided on at least one surface of a base paper,
And the mixing ratio of the component (A) and the component (B) is (A) :( B) = 100: 0.0
A recording paper having a weight ratio of 1 to 30. 2. A method comprising a water-soluble resin or a water-dispersible resin (A) and a polyhydric alcohol (C) between a base paper and an ink absorbing layer,
And the mixing ratio of the components (A) and (C) is (A) :( C) = 100: 0-3
2. A layer (intermediate layer) having a weight ratio of 0 (intermediate layer).
Recording paper described. 3. The ink absorbing layer further comprises a polyhydric alcohol.
The compounding ratio of (C) to (A) and (C) is (A) :( C) = 100: 0.01.
The recording paper according to claim 1, wherein the recording paper is blended so as to be 30 to 30 (weight ratio). 4. The ink absorbing layer further has a particle size of 0.5 to 50 μm.
2. The crosslinked silicone particles (D) of (m) are blended so that the blending ratio of the components (A) and (D) is (A) :( D) = 100: 0.01 to 30 (weight ratio). The recording paper according to any one of claims 1 to 3. 5. The ink absorbing layer further comprises the following general formula (1)
The layered silicate (E) modified with an organic treating agent represented by
The compounding ratio of the component (A) and the component (E) is (A) :( E) = 100: 0.01-50
The recording paper according to any one of claims 1 to 4, wherein the recording paper is blended so as to be (weight ratio). Embedded image [In the formula, at least one of the four substituents R ^{1 to} R ⁴ is a (CH ₂ CH ₂ O) _n H group or A group (n is a positive number of 1 to 50), and the remaining substituents are a linear or branched alkyl group having 1 to 10 carbon atoms or hydrogen. Further X ^- is _{^{Cl -, Br -, NO 3}} -, OH - or CH ₃ CO
O ^- it is. ] 6. The water-soluble resin or the water-dispersible resin (A) is a partially saponified polyvinyl alcohol having a saponification degree of 65 to 90 mol%, or a cation having a cationic group in 0.01 to 25 mol% of all monomers. The recording paper according to any one of claims 1 to 5, which is a modified polyvinyl alcohol. 7. An ester nonionic surfactant (B) having an HLB of 11 or more is polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monolaurate. Eate, polyoxyethylene sorbitan trioleate, polyoxyethylene sorbite tetraoleate, polyoxyethylene monopalmitate, polyoxyethylene monostearate, polyoxyethylene monolaurate, polyoxyethylene monooleate, decaglycerin monostearic acid Esters, hexaglycerin monostearate, decaglycerin monooleate, hexaglycerin monooleate, decaglycerin monolaurate, f Sa glycerol mono laurate, recording paper according to any one of claims 1 to 6 is from 1 or more selected the group consisting of decaglycerol caprylate esters and hexaglycerin mono-caprylate esters. 8. The polyhydric alcohol (C) is at least one selected from the group consisting of glycerin, ethylene glycol, trimethylene glycol, tetramethylene glycol, propylene glycol, diethylene glycol and polyglycerin having a degree of polymerization of 2 or more. Any one of items 3 to 7
Recording paper according to the item. 9. The recording paper according to claim 4, wherein the crosslinked silicone particles (D) are polymethylsilsesquioxane.