JPH10166713A - recoding media - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an ink jet recording medium that excels in ink absorbency, produces less dot bleeding and is water resistant, by applying a coating whose main components is a cationic resin ink fixing agent, to paper having a specified Stockigt sizing degree, and adjusting the sizing degree to a specified range. SOLUTION: In an ink jet recording medium that is recorded with aqueous ink, the Stockigt sizing agree is adjusted to 4-20sec by applying a coating whose main component is a cationic resin ink fixing agent is applied to paper having Stockigt sizing degree of 3sec or less. The Stockigt sizing degree can be controlled only by the cationic resin ink fixing agent. However, a small amount of a sizing agent may be added. The sizing agent may be cationic, anionic or nonionic. From the view-point of stability and water resistance of the coating, the cationic sizing agent is preferable. As cationic resin, dicyandiamide.diethylene triamine polycondensates may be mentioned.

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 medium for recording on a recording medium using an aqueous ink.
The present invention also relates to an ink jet recording medium having excellent printing water resistance.

[0002]

2. Description of the Related Art An ink jet recording system using an aqueous ink has a low noise at the time of recording, is easy to colorize, and is capable of high-speed recording. Applications to form printing and the like are being promoted. Because high-quality paper and coated paper used for general printing have poor ink absorption,
The printed ink does not dry on the paper surface and remains for a long time,
Practicality is poor because the apparatus and the continuously printed sheet are contaminated or the image becomes dirty. In order to solve such a problem, a recording paper having a small size is used (Japanese Patent Laid-Open No.
No. 53012) or a base paper containing a urea-formalin resin impregnated with a water-soluble polymer.
49113). Furthermore,
There has been proposed a recording paper (Japanese Patent Application Laid-Open No. 55-51583) in which amorphous silica is coated on the surface for the purpose of improving the color developing property and color reproducibility of the ink. Further, an electrophotographic and ink-jet recording co-paper having an appropriate size and containing a filler such as calcium carbonate (Japanese Patent Application Laid-Open No. 6-8617) has been proposed. However, the recording medium proposed in the above has a drawback that since recording is performed with aqueous ink, if water or the like adheres to the recording formed on the medium, the recording is impaired by re-elution.

[0003] Accordingly, after recording, a water-resistant agent for forming a lake with a dye such as a cationic polymer or a water-soluble metal salt is applied (Japanese Patent Application Laid-Open No. 55-150396), or a polycation polymer electrolyte is contained on the surface. An ink jet recording method for printing on a recording medium with an aqueous ink containing a water-soluble direct dye or an acidic dye (JP-A-56-89992), or a dye using a resin-type dye fixing agent or a quaternary ammonium salt as a basic compound A coating with a fixing agent (JP-A-60-161188) has been proposed. However, the dye mordant composed of various cationic ink fixing agents such as dicyandiamide formaldehyde condensate and polyamine and polyethyleneimine shown in these proposals can be used as a white paper yellow when an amount that provides sufficient water resistance is used. It has the disadvantage of causing discoloration and fading of the dye.

In order to solve these disadvantages, a quaternary ammonium salt having a specific structure (Japanese Patent Laid-Open No. 61-2938).
No. 86, Japanese Unexamined Patent Publication Nos. 62-238783 and 64-9776) and the use of polyalkylenepolyamine dicyandiamide ammonium salt condensate (Japanese Patent Laid-Open No. 2-35675) have been proposed. Was not always satisfactory. Further, there is a demand for performing ink jet recording on continuous slip paper printed and processed by a form printing machine, and a recording medium having both general printability, workability and ink jet recording suitability is demanded.

[0005]

SUMMARY OF THE INVENTION The present invention provides an ink jet recording medium having small dot bleeding, sufficient water resistance, and excellent ink absorbability. Another object of the present invention is to provide a high-quality or medium-quality foam paper having excellent inkjet recording suitability such as water resistance and ink absorbability.

[0006]

In order to improve the above-mentioned drawbacks, to obtain an ink jet recording medium having excellent ink absorbency, small dot bleeding, and excellent water resistance, the present inventors have proposed a method for preparing a Stighit sizing medium. As a result of intensive studies on the relationship between ink absorption, dot bleeding, and water resistance, the present inventors have found that an ink jet recording medium that solves the above problem can be obtained, and has completed the present invention.

[0007] The present invention includes the following aspects. [1] A base paper having a Stighit sizing degree of 3 seconds or less is coated with a paint mainly containing an ink fixing agent of a cationic resin,
An ink jet recording medium having a Steckigt sizing degree adjusted from 4 seconds to 20 seconds. [2] The ink jet recording medium according to [1], wherein the paint further contains a sizing agent. [3] The ink jet recording medium according to [1] or [2], wherein the sizing agent is a cationic sizing agent. [4] The ink jet recording medium according to [1], [2] or [3], wherein the cationic resin is a dicyandiamide / diethylenetriamine polycondensate. [5] The dry coating amount of the cationic resin is 0.1 g /
m ^{2 to 3} g / m ² of foam paper [1],
[2] The ink jet recording medium according to [3] or [4].

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Pulp used for base paper is a chemical pulp such as a sulphite pulp (SP) obtained from hardwood and softwood, an alkali pulp (AP), a kraft pulp (KP), a semi-chemical pulp, a semi-mechanical pulp, and a machine. Pulp and the like can be mentioned, and waste paper pulp, which is a deinked secondary fiber, can also be used, and high quality paper and medium quality paper made from this can be used. In order to obtain a certain degree of strength, the pulp is preferably lightly beaten pulp. Furthermore, if it is a hydrophilic fiber, recycled fiber such as rayon, cellulose derivative fiber or polyvinyl alcohol,
Although hydrophilic synthetic polymer fibers such as polyacrylamide can be used, broadleaf bleached kraft pulp (LBKP) is most suitable from the viewpoint of printing quality (feathering: mustache-like bleeding that appears along the fibers) and cost. .

The filler is not particularly limited, and white pigments having an oil absorption of about 40 to 270 ml / 100 g such as talc, clay, calcined clay, calcium carbonate and amorphous silica can be used, and these can be used in combination. In the case of the ink jet recording medium of the present invention, the filler content of the support is about 2% to
About 20% is preferable. If the amount of the filler is small, there is a case where the back of the printed matter becomes a problem. If the amount of the filler is large, the paper strength may be weakened. No particular limitation is imposed on the size of the filling material, and the size for acidic papermaking and neutral papermaking based on rosin, alkyl ketene dimer (hereinafter AKD), alkenyl succinic anhydride (hereinafter ASA) or styrene synthetic resin as a main component. Agents can be used as appropriate.

Ink-jet recording media obtained by applying a cationic resin ink fixing agent to base paper having a Steckigt sizing degree of more than 3 seconds have poor ink absorbency, and ink is not drawn into the inside and the dye is coated on the surface. , The water resistance is inferior. Next, a paint containing a cationic ink fixing agent as a main component is applied to a base paper having a Stexigt sizing degree of 3 seconds or less.
When plain paper of 0 seconds or less is used, uniform water resistance treatment is performed, and at the same time, dot bleeding can be reduced, and an inkjet recording medium with sharp edges can be obtained. In the thus-produced ink jet recording medium,
When ink-jet recording is performed with an aqueous ink containing a direct dye or an acid dye having an anionic dissociating group, the dye in the aqueous ink and the ink fixing agent of the cationic resin in the recording medium bind to prevent the elution of the dye. It is considered to be excellent in recording water resistance and effective in improving bleeding.

Further, the cationic resin used in the present invention
The ink fixing agent is water-soluble or aqueous emulsion type
Is used, but because of the simplicity of size adjustment
A water-soluble type is preferably used. Water soluble tie
Examples of the ink fixing agent of the cationic resin of the ink
Dishes represented by polycondensates of cyanodiamide and formalin
Anne-based ink fixing agent, dicyandiamide / diethyleneto
Polyamine-based ink fixing represented by polyamine polycondensate
Agent, epichlorohydrin / dimethylamine addition polymer,
Dimethyl diallyl ammonium chloride / SO_TwoShared weight
Compound, diallylamine salt / SO_TwoCopolymer, dimethyldi
Allyl ammonium chloride polymer, allylamine salt
Polymer, dialkylaminoethyl (meth) acrelay
And polycationic ink fixing agents such as quaternary salt polymers.
I can do it. Among them, from the viewpoint of paint stability, Dicyan
Diamide / diethylenetriamine polycondensate is more preferred
Commonly used. Ink fixer for cationic resin in coating liquid
Is not particularly limited, but is 40% to 1% in the solid content of the coating solution.
00% is preferred, more preferably 60% to 100%,
Most preferably, it is 70% to 95%. The coating amount is also particularly limited
Although not specified, dry coating amount of cationic resin ink fixing agent
0.1 g / m^Two~ 3g / m^TwoDegree, preferably
0.1 g / m^Two~ 2g / m^TwoDegree, more preferably 0.
2g / m^Two~ 1.5g / m ^TwoIt is about.

The content of the ink fixing agent of the cationic resin is not particularly limited, but the Steckigt sizing degree after the application of the cationic resin ink fixing agent is from 4 seconds to 20 seconds, preferably 4 seconds. More than 12 seconds. The effects of ink absorption and water resistance can be obtained by applying a cationic resin ink fixing agent to a base paper having a Steckigt sizing degree of 3 seconds or less and distributing the cationic ink fixing agent to the inside of the base paper. It is considered that this causes the ink to be quickly drawn into the paper and fixed or protected inside the paper. In addition, the degree of Stekigt sizing after the application of the cationic resin ink fixing agent is set to 4 seconds or more and 20 minutes.
By adjusting the time to seconds or less, the bleeding of dots can be reduced. This is considered to be due to the size effect that the ink droplet does not spread in the horizontal direction but penetrates in the vertical direction with respect to the surface of the recording medium.

[0013] The control of the degree of Stigecht sizing can be carried out only with a cationic resin ink fixing agent, but a small amount of a sizing agent may be added. The amount of the sizing agent to be added is not particularly limited as long as the degree of Stekigt sizing after coating can be adjusted to 4 seconds to 20 seconds, but the coating amount after drying is 0.0001 to 0.1 g / About m ² is appropriate.

Examples of the sizing agent that can be added to the coating containing the cationic resin ink fixing agent include the following.
Specifically, petroleum oil-based sizing agent, rosin ester-based sizing agent, styrene-maleic acid-based sizing agent, styrene / acrylic copolymer-based sizing agent, styrene-acryl emulsion-based sizing agent, acryl-based copolymer-based sizing agent, acrylic emulsion-based sizing agent Examples include a sizing agent, an olefin maleic resin-based sizing agent, a urethane-based sizing agent, and an AKD-based sizing agent. As the sizing agent, cationic, anionic or nonionic ones are used, and cationic ones (including those obtained by cationically modifying each of the above-mentioned sizing agents and the like) are preferable from the viewpoint of the stability and water resistance of the paint.

Further, when the degree of Stekigt sizing after applying the coating liquid containing the ink fixing agent of the cationic resin is less than 4 seconds,
Inability to reduce dot bleed and lack sharp edges. When the degree of stiffness of the cationic ink fixing agent after application exceeds 20 seconds, the ink absorbency is poor, or the ink is not drawn into the inside and the dye is left on the surface, resulting in poor water resistance. .

Further, if necessary, a pigment or a polymer resin (also referred to as a binder) can be added to a coating containing a cationic resin ink fixing agent. If necessary, various additives,
Alternatively, various pigments having an ink absorbing ability can be used in combination. Examples of such pigments include inorganic pigments such as amorphous silica, alumina, hydrated alumina, calcined kaolin, and calcium carbonate, and organic pigments such as urea-formaldehyde resin particles, melamine-formaldehyde resin particles, and benzoguanamine resin particles. Examples include pigments, but are not limited thereto. The polymer resin (binder) is not particularly limited, but is appropriately selected from polyvinyl alcohol, oxidized starch, cationized starch, and other water-soluble polymers. The compounding ratio of the binder is as follows: the ink fixing agent of the cationic resin: the binder = 1: 2-1: 0.005
The degree is preferred. When the binder ratio is too large, the degree of Stigecht size is increased, and the water resistance is deteriorated.

In the present invention, a method of incorporating a coating containing an ink fixing agent of a cationic resin may be performed by using an aqueous solution or an aqueous liquid alone or, if necessary, by mixing and using a commonly used binder or the like. It can be applied onto the base paper by a commonly used coating means such as a size press, shim size, gate roll, roll coater, bar coater, air knife coater, rod blade coater, blade coater and the like. In order to reduce the manufacturing cost, application means such as a size press, a shim size, and a gate roll are preferable.

On the other hand, the aqueous ink used in the present invention is a recording liquid comprising the following colorant, liquid medium, and other additives. As the colorant, a water-soluble dye such as a direct dye, an acid dye, a basic dye, a reactive dye, or a food colorant is preferably used.

The liquid medium of the aqueous ink includes water and various water-soluble organic solvents such as methyl alcohol,
Alkyl alcohols having 1 to 4 carbon atoms such as ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol, tert-butyl alcohol, and isobutyl alcohol; amides such as dimethylformamide and dimethylacetamide; Ketones or ketone alcohols such as acetone and diacetone alcohol; ethers such as tetrahydrofuran and dioxane; polyalkylene glycols such as polyethylene glycol and polypropylene glycol; ethylene glycol, propylene glycol, butylene glycol, triethylene glycol, 1,2, 6, -hexanetriol, thiodiglycol, hexylene glycol,
Alkylene glycols having 2 to 6 alkylene groups such as diethylene glycol; lower alkyl ethers of polyhydric alcohols such as glycerin, ethylene glycol methyl ether, diethylene glycol methyl (or ethyl) ether, and triethylene glycol monomethyl (or ethyl) ether; Is mentioned. Among these many water-soluble organic solvents, polyhydric alcohols such as diethylene glycol and lower alkyl ethers of polyhydric alcohols such as triethylene glycol monomethyl ether and triethylene glycol monoethyl ether are preferred.
Other additives such as pH adjusters, sequestering agents,
Examples include a fungicide, a viscosity modifier, a surface tension modifier, a wetting agent, a surfactant, and a rust inhibitor.

[0020]

The present invention will be described in more detail with reference to the following examples, but it should be understood that the present invention is by no means restricted to these examples. In the Examples, parts and% mean parts by weight and% by weight unless otherwise specified.

Example 1 80 parts of LBKP and 20 parts of NBKP were mixed to form a filter
Light calcium carbonate on pulp slurry adjusted to 50ml
(Product name: PC, manufactured by Shiraishi Mining Co., Ltd.) 21 parts, ASA system
Sizing agent (trade name: Fibulan-81, Oji National)
0.05 parts of cationized starch (trade name: Ca)
toF, Oji National Co., Ltd.) 0.8 parts
Neutral paper was made with a paper machine. The basis weight of this sheet is 8
1.4 g / m ^Two, Stekihito sizing degree is 2 seconds, ash content is 17
%was. This base paper has a cationic resin ink fixing agent
Epichlorohydrin / dimethylamine addition polymer
(Product name: PAL-2, manufactured by Senka Co., Ltd.) 8 parts and oxidation
Starch (trade name: Ace A, manufactured by Oji Cornstarch) 4
Bar coating with water-based coating liquid (paint solids concentration 12%)
3g / m solid content on base paper^TwoAnd let it dry
Drying, inkjet recording medium of 7 sec.
I got a body.

Example 2 Epichlorohydrin / dimethylamine addition polymer (trade name: PAL-2, manufactured by SENKA CORPORATION) was used as an ink fixing agent for a cationic resin on the same base paper as used in Example 1.
Aqueous coating liquid containing 2 parts and 1 part of oxidized starch (trade name: Ace A, manufactured by Oji Cornstarch Co., Ltd.) (paint solid content: 3%)
Was attached using a size press so as to have a solid content of 3 g / m ^2, and dried to obtain an inkjet recording medium having a Stockigt size of 7 seconds.

Example 3 An epichlorohydrin / dimethylamine addition polymer (trade name: PAL-2, manufactured by SENKA CORPORATION) was used as an ink fixing agent for a cationic resin on the same base paper used in Example 1.
Aqueous coating liquid containing 20 parts and 10 parts of oxidized starch (trade name: Ace A, manufactured by Oji Cornstarch Co., Ltd.)
0%) on a base roll and a solid content of 3 g / m ²
And dried to obtain a Stekchito sizing degree of 7.
Second inkjet recording medium was obtained.

Example 4 On the same base paper used in Example 1, 2 parts of an epichlorohydrin / dimethylamine addition polymer (trade name: PAL-2, manufactured by Senka Co., Ltd.) as a cationic ink fixing agent and oxidized An aqueous coating solution (paint solid content concentration: 3%) containing 1 part of starch (trade name: Ace A, manufactured by Oji Cornstarch Co., Ltd.) was coated on a bar and adhered to base paper so as to have a solid content of 1 g / m ^2. After drying, an inkjet recording medium having a Steckigt size of 4 seconds was obtained.

Example 5 An epichlorohydrin / dimethylamine addition polymer (trade name: PAL-2, manufactured by SENKA CO., LTD.) Was used as a cationic ink fixing agent on the same base paper as used in Example 1.
And 8 parts of oxidized starch (trade name: Ace A, manufactured by Oji Cornstarch Co., Ltd.) (coating solid concentration: 24%)
Was coated on a bar to adhere to a base paper so as to have a solid content of 6 g / m ^2, and dried to obtain an ink jet recording medium having a Steckigt size of 20 seconds. Example 6 In Example 1, AK was used in place of the ASA internal sizing agent.
An ink jet recording medium having a Stockigt sizing degree of 7 seconds was obtained in exactly the same manner as in Example 1 except that the D-based internal sizing agent (trade name: SPK-901, manufactured by Arakawa Chemical Co., Ltd.) was used in an amount of 0.03 part.

Example 7 The procedure of Example 1 was repeated, except that the addition ratio of the filler in the base paper was changed to 15 parts.
Second inkjet recording medium was obtained. Example 8 An ink jet recording medium having a Stockigt size of 7 seconds was obtained in exactly the same manner as in Example 1 except that the filler in the base paper was changed to calcined clay.

Example 9 On the same base paper as used in Example 1, a polymer of an allylamine salt (trade name:
An aqueous coating solution (paint solid content: 14%) containing 10 parts of PAA-HCl-3L (manufactured by Nitto Boseki Co., Ltd.) and 4 parts of oxidized starch (trade name: Ace A, manufactured by Oji Cornstarch Co., Ltd.) was applied by bar coating. Then, the ink was adhered to a base paper so as to have a solid content of 2 g / m ² and dried to obtain an ink jet recording medium having a Steckigt size of 10 seconds.

Example 10 On the same base paper as used in Example 1, a polymer of an allylamine salt (trade name:
An aqueous coating solution (paint solids concentration: 14%) containing 10 parts of PAA-HCl-10L (manufactured by Nitto Boseki Co., Ltd.) and 4 parts of oxidized starch (trade name: Ace A, manufactured by Oji Cornstarch Co., Ltd.) was coated with a bar. Then, the ink was adhered on a base paper so as to have a solid content of 1 g / m ² and dried to obtain an ink jet recording medium having a Steckigt size of 10 seconds.

Example 11 An epichlorohydrin / dimethylamine addition polymer (trade name: PAL-2, manufactured by SENKA CORPORATION) was used as an ink fixing agent for a cationic resin on the same base paper as that used in Example 1.
8 parts, 4 parts of oxidized starch (trade name: Ace A, manufactured by Oji Cornstarch Co., Ltd.) and 0.05 part of anionic styrene acrylic copolymer sizing agent (trade name: Polymeron 385, Arakawa Chemical Co., Ltd.) Liquid (paint solids concentration 12.
(05%) was applied on a bar, adhered to a base paper so as to have a solid content of 3 g / m ^2, and dried to obtain an inkjet recording medium having a Stöckigt size of 10 seconds.

Example 12 Epichlorohydrin / dimethylamine addition polymer (trade name: PAL-2, manufactured by SENKA CORPORATION) was used as an ink fixing agent for a cationic resin on the same base paper used in Example 1.
8 parts, 4 parts of oxidized starch (trade name: Ace A, manufactured by Oji Cornstarch) and 0.05 parts of nonionic acrylic emulsion sizing agent (trade name: Hamacoat S-900G, manufactured by Misawa Ceramic Chemical Co., Ltd.) The coating solution (paint solid concentration: 12.05%) was coated with a bar, adhered to the base paper so as to have a solid content of 3 g / m ^2, and dried to obtain an ink jet recording medium having a Steckigt size of 10 seconds. .

Example 13 A dicyandiamide / diethylenetriamine polycondensate (trade name: NEOFIX E-117, trade name) was used as an ink fixing agent for a cationic resin on the same base paper used in Example 1.
An aqueous coating liquid (paint solids concentration: 12%) containing 8 parts of Nichika Chemical Co., Ltd. and 4 parts of oxidized starch (trade name: Ace A, manufactured by Oji Cornstarch Co., Ltd.) is coated with a bar and solidified on base paper. Minute 3
g / m ^2, and dried to obtain an inkjet recording medium having a Steckigt size of 7 seconds.

Example 14 On the same base paper as that used in Example 1, dicyandiamide / diethylenetriamine polycondensate (trade name: Neofix E-117, as a fixing agent for cationic resin ink)
8 parts of Nika Chemical Co., Ltd., 4 parts of oxidized starch (trade name: Ace A, manufactured by Oji Cornstarch Co., Ltd.) and anionic styrene acrylic copolymer sizing agent (trade name: Polymalon 385, manufactured by Arakawa Chemical Co., Ltd.) An aqueous coating solution containing 0.05 part (a solid content of 12.05%) was coated with a bar, adhered to a base paper so as to have a solid content of 3 g / m ^2, and dried. Was obtained. Example 15 Dicyandiamide / diethylenetriamine polycondensate (trade name: Neofix E-117, as a fixing agent for cationic resin ink) was applied to the same base paper used in Example 1.
8 parts of Nichika Chemical Co., Ltd., 4 parts of oxidized starch (trade name: Ace A, manufactured by Oji Cornstarch Co., Ltd.) and nonionic acrylic emulsion sizing agent (trade name: Hamacoat S
-900G, manufactured by Misawa Ceramic Chemical Co., Ltd.) 0.05
Part of the aqueous coating solution (paint solid concentration: 12.05%) containing a solid portion is applied on a bar, adhered to the base paper so as to have a solid content of 3 g / m ² , dried, and inkjet-recorded at a Stighit sizing degree of 10 seconds. I got the medium.

Example 16 An epichlorohydrin / dimethylamine addition polymer (trade name: PAL-2, manufactured by SENKA CORPORATION) was used as an ink fixing agent for a cationic resin on the same base paper used in Example 1.
8 parts, 4 parts of oxidized starch (trade name: Ace A, manufactured by Oji Cornstarch Co., Ltd.) and 0.05 part of cationic styrene acrylic copolymer sizing agent (trade name: Polymeron 360, manufactured by Arakawa Chemical Co., Ltd.) Liquid (paint solids concentration 12.
(05%) was applied on a bar, adhered to a base paper so as to have a solid content of 3 g / m ^2, and dried to obtain an inkjet recording medium having a Stöckigt size of 10 seconds.

Example 17 On the same base paper as that used in Example 1, dicyandiamide / diethylenetriamine polycondensate (trade name: Neofix E-117, as a fixing agent for cationic resin ink)
8 parts of Nichika Chemical Co., Ltd., 4 parts of oxidized starch (trade name: Ace A, manufactured by Oji Cornstarch Co., Ltd.) and cationic styrene acrylic copolymer sizing agent (trade name: Polymalon 360, manufactured by Arakawa Chemical Co., Ltd.) An aqueous coating solution containing 0.05 part (a solid content of 12.05%) was coated with a bar, adhered to a base paper so as to have a solid content of 3 g / m ^2, and dried. Was obtained.

COMPARATIVE EXAMPLE 1 80 parts of LBKP and 20 parts of NBKP were mixed and the degree of filtration was 4
21 parts of light calcium carbonate (trade name: PC, manufactured by Shiraishi Mining Co., Ltd.) and alkenyl succinic anhydride (ASA) -based filling sizing agent (trade name: Fibran-81, manufactured by Oji National Co., Ltd.) were added to the pulp slurry adjusted to 50 ml. 0.08 parts and 0.8 parts of cationized starch (trade name: CatoF, manufactured by Oji National Co., Ltd.) were added, and neutral paper was formed by a fourdrinier machine. The basis weight of this sheet was 81.4 g / m ² , the Steckigt sizing degree was 5 seconds, and the ash content was 17%. Epichlorohydrin is used as a fixing agent for cationic resin ink on this base paper.
Aqueous coating liquid (paint solids) containing 2 parts of dimethylamine addition polymer (trade name: PAL-2, manufactured by Sengka Co., Ltd., molecular weight 23000) and 1 part of oxidized starch (trade name: Ace A, manufactured by Oji Cornstarch Co., Ltd.) (Concentration: 3%) using a size press to adhere to a solid content of 3 g / m ² and dried.
An ink jet recording medium having a Stockigt size of 10 seconds was obtained.

Comparative Example 2 A polymer of an allylamine salt (trade name: PAA) was used as a cationic ink fixing agent on the base paper obtained in Example 1.
-HCl-3L, 10 parts of Nitto Boseki Co., Ltd.) and 4 parts of oxidized starch (trade name: Ace A, manufactured by Oji Cornstarch Co., Ltd.) by bar coating with a bar coating. A solid content of 0.3 g / m ² was applied to the base paper and dried to obtain an ink jet recording medium having a Steckigt size of 3 seconds.

Comparative Example 3 A polymer of an allylamine salt (trade name: PAA) was used as a cationic ink fixing agent on the base paper obtained in Example 1.
-HCl-3L, 10 parts of Nitto Boseki Co., Ltd.) and 4 parts of oxidized starch (trade name: Ace A, manufactured by Oji Cornstarch Co., Ltd.) by bar coating with a bar coating. A solid content of 5 g / m ² was applied to the base paper and dried to obtain an ink jet recording medium having a Steckigt sizing degree of 25 seconds.

For each of the above recording media, the ink absorptivity,
Table 1 shows the results of evaluating dot bleeding and water resistance.
The methods for measuring various physical property values in the examples are shown below. The record is
Using an A4 size recording sheet, all were performed by an inkjet printer IO-735 manufactured by Sharp Corporation.
For recording, solid printing and single dot printing were performed in black, magenta, cyan, and yellow, respectively.

1) Ink Absorption The ink absorption speed of the solid printing portion of each color was measured by measuring the time until the gloss of the ink disappeared after printing, and evaluated in three steps according to the following procedure. ：: less than 2 seconds Δ: 2 seconds or more to less than 5 seconds ×: 5 seconds or more 2) Dot Bleed A single dot print portion was evaluated 24 hours after printing.
The degree of bleeding was visually evaluated in the following manner. ◎: Does not bleed at all. ：: Hardly bleeds. Δ: Somewhat blurred. (Small degree of bleeding) ×: Large degree of bleeding.

3) Water resistance The printed sheet was immersed in tap water for 1 minute and air-dried. The degree of water resistance was visually evaluated in the following manner. A: No change at all. ：: almost no change. Δ: Almost no ink flowed out, but dots spread in the tap water immersion part. X: Ink flows out.

4) Stability of paint After the paint was prepared, it was allowed to stand for 7 days, and the state of the paint was visually evaluated in the following manner. ：: No change. Δ: A small amount of sediment was generated. X: A large amount of sediment was generated.

[0042]

[Table 1]

As is clear from Table 1, Comparative Examples 1 and 3 have poor ink absorbency and water resistance, while Comparative Example 2 has poor dot bleeding. Then, a paint containing a cationic ink fixing agent as a main component is applied to reduce the Stechigt sizing degree to 4 seconds or more.
By setting the time to 0 second or less, Examples 1 to 17 exhibited improved ink absorbency, dot bleeding, and water resistance, and exhibited excellent inkjet suitability. Examples 11, 12, and 1
Addition of a sizing agent to the paint, as in 4 to 17, further improves dot bleeding. Also, as in Example 13,
Water resistance is further improved by using a dicyandiamide / diethylenetriamine polycondensate as a cationic ink fixing agent. When a cationic sizing agent is used as in Example 17 and a dicyandiamide / diethylenetriamine polycondensate is used as a cationic ink fixing agent, dot bleeding and water resistance are simultaneously improved.

[0044]

According to the present invention, a high quality paper or a medium paper type (a type having no thick pigment coating layer) having excellent ink absorbency, small dot bleeding, and excellent water resistance of printing. Is the same as plain paper). Such a recording medium was also excellent in general printability and workability as high-quality or medium-quality foam paper.

Claims (5)

[Claims] 1. A base paper having a Stekihito size of 3 seconds or less,
An ink jet recording medium obtained by applying a paint containing a cationic resin ink fixing agent as a main component, and adjusting the degree of Stekigt to 4 seconds or more and 20 seconds or less. 2. The ink jet recording medium according to claim 1, wherein said paint further contains a sizing agent. 3. The ink jet recording medium according to claim 1, wherein the sizing agent is a cationic sizing agent. 4. The ink jet recording medium according to claim 1, wherein the cationic resin is a dicyandiamide / diethylenetriamine polycondensate. 5. The dry coating amount of the cationic resin is 0.5.
1g / m ² ~3g / m ² of business forms ink jet recording medium according to claim 1, 2, 3 or 4, wherein.