JP2001130131A - Ink jet recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink jet recording medium adapted to a rapid color recording. SOLUTION: In the ink jet recording medium comprising a recording layer provided on at least one surface of a support made of paper, the transfer amount of a distilled water to the medium for a contact time of 400 ms measured by a dynamic scanning potometer is 30 ml/m2 or more, and an absorption coefficient is 1.3 to 7 ml/[m2.(ms)1/2].

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.

[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 remains on the paper surface without drying for a long time, and contaminates the apparatus and the continuously printed sheet or stains the image. In order to solve such a problem, a recording paper having a low size is used (Japanese Patent Laid-Open No.
No. 53012) and a base paper containing a urea-formalin resin internally impregnated with a water-soluble polymer (Japanese Patent Laid-Open No. 53-4 / 1983)
No. 9113). Further, recording papers coated with various porous inorganic pigments such as amorphous silica on the surface for the purpose of enhancing the color development and reproducibility of the ink (JP-A-55-51583, JP-A-5-51583)
No. 6-148585) is disclosed. Further, in order to obtain a high-definition image with reduced bleeding, the physical properties of these porous pigments are specified (JP-A-58-110287,
JP-A-59-185690, JP-A-61-141
No. 584) has been proposed.

[0003] In particular, in recent years, there has been an increasing demand for a higher printing speed, and the ink droplet ejection speed has been improved due to advances in ink jet recording techniques, and ink ejection has been performed at shorter time intervals. . In order to cope with such a technology, an ink jet recording medium is required to have a performance capable of absorbing and fixing ink ejected in a shorter time. For example, water is applied to the entire sheet in about 0.1 second. (For example, Japanese Patent Application Laid-Open Nos. 2-76774 and 4-49086) have been proposed. However, higher-speed printing techniques have been realized, and these have the properties proposed. Even if a recording medium is used, the above object is not always satisfied, and it is suggested that not only the amount of transfer but also the paper properties including the absorption rate are decisive factors for the development of the expected ink absorbency. You.

[0004]

SUMMARY OF THE INVENTION The present invention relates to an ink jet recording system for recording on a recording medium using an aqueous ink, which is excellent in ink absorbency and high-precision image reproducibility and suitable for high-speed color recording. An inkjet recording medium is provided.

[0005]

Means for Solving the Problems The present inventor has made intensive studies on the characteristics of a recording medium and a method of manufacturing the same in order to improve the ink absorbency of a recording medium used for ink-jet recording for performing high-speed printing. As a result, we focused on the physical properties of the paper 400 ms after the ink landed on the ink jet recording medium, and by specifying this, it was found that an ink jet recording medium with excellent reproducibility of a high-definition image was obtained even at high-speed printing. Thus, the present invention has been completed.

[0006] The present invention includes the following aspects. [1] In an ink jet recording medium in which a recording layer is provided on at least one surface of a paper support, a contact time of 400 ms (ie, 20 ° C.) measured by a dynamic scanning liquid absorption meter.
(ms), that is, the transfer amount of distilled water to the recording medium at 20 (ms) ^1/2 ) is 30 ml / m ² or more, and the absorption coefficient is 1.3 to 7 ml / [m ² · √ (ms)] or more. An ink jet recording medium characterized by the following. [2] The ink jet recording medium according to [1], wherein the recording layer contains a porous pigment, a binder, and a nonionic surfactant. [3] The ink jet recording medium according to [1] or [2], wherein the coating amount of the recording layer is in a range of 1 to 10 g / m ² per one side. [4] The non-ionic surfactant contained in the recording layer is a polyethylene oxide derivative [2].
Or the inkjet recording medium according to [3]. [5] The nonionic surfactant contained in the recording layer has a hydrophilic group / hydrophobic group ratio (HLB) in the range of 8 to 18, [2], [3]. Or the inkjet recording medium according to [4]. [6] The inkjet recording medium according to any one of [2] to [5], wherein the molecular weight of the nonionic surfactant contained in the recording layer is in the range of 300 to 2,000. [7] The inkjet recording medium according to any one of [1] to [6], wherein the binder is at least one selected from a polymer or a copolymer latex containing an acrylic latex and vinyl acetate.

[8] The ink jet recording medium according to [7], wherein the binder is an acrylic latex. [9] The recording layer contains a nonionic surfactant in an amount of 0.
The inkjet recording medium according to any one of [2] to [8], which contains 5 to 20% by weight, preferably 1 to 10% by weight. [10] The nonionic surfactant has a hydrophilic group / hydrophobic group ratio (HLB) of more than 10 and not more than 18 and preferably not less than 11 and not more than 14. The inkjet recording medium according to any one of [2] to [9].

[0008] A dynamic scanning absorptiometer continuously scans a recording medium fixed on a horizontal turntable rotating at a constant speed through a slit of a constant width and length in contact with the recording medium. Is a device that measures using a method of transferring
The amount by which a liquid such as water transfers over time can be measured.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In other words, the number of paper supports is small.
Inkjet recording with a recording layer on one side
In a medium, a dynamic scanning absorptiometer (rotates at a constant speed)
On a recording medium fixed on a horizontal turntable,
From a slit of fixed width and length in contact with
Measure using the method of transferring distilled water), contact time
Record of distilled water at 20 ° (ms) (ie 400 ms)
Transfer volume to the medium is 30ml / m ^TwoAbove and absorption coefficient
1.3-7ml / [m^Two・ √ (ms)]
It has better ink absorbability and is suitable for high-speed printing.
Can print clear images without ink run-out or bleeding.
It has been found that an ink jet recording medium can be obtained.

[0010] An ink jet recording medium satisfying the requirements of the present invention comprises a nonionic surfactant, more preferably a polyethylene oxide derivative, in a recording layer containing a binder such as a porous pigment and an acrylic latex. It can be prepared by using the following nonionic surfactant. Many proposals have been made for incorporating a surfactant into the recording layer for the purpose of promoting ink absorption, for example, see JP-A-59-3317.
No. 7, JP-A-63-274581,
A method using an amino-modified polyethylene oxide derivative or using a high molecular weight polyalkylene oxide reactant (JP-A-61-32787, JP-A-61-748)
No. 79) has been proposed. Many kinds of surfactants are industrially manufactured and used industrially, and at present, they are appropriately selected and used according to their respective purposes from those having various structures and physical properties. Also, polyethylene oxide derivatives have been widely used as one of these. Among these, block copolymers of polyoxyethylene and polyoxypropylene (Japanese Patent Laid-Open No. 1-2
80581),
It has been proposed that a nonionic surfactant having an HLB value within a specific range is selected (Japanese Patent Application Laid-Open No. 2-139986). Further, a nonionic surfactant is used in combination with a silanol group-modified polyvinyl alcohol ( JP-A-11-115304) discloses a method and the like. By designing the recording medium based on these, a certain improvement in the ink absorbency is recognized. However, by incorporating a surfactant to improve ink absorption,
The ink droplets that land on the paper surface are immediately drawn into the recording layer, but at the same time, the ink spreads in the direction of the surface.
Dots tend to bleed and the sharpness of the delineation of the fine line portion is poor, and the halftone print gradation is impaired, so that a satisfactory ink jet recording medium cannot always be provided.

The present inventor was able to obtain an excellent improvement effect with a recording medium having the above-mentioned characteristics defined in the present invention. Further, in the recording layer comprising a binder containing a water-dispersible resin such as a porous pigment and an acrylic latex, a nonionic surfactant selected from those exemplified below such as a polyethylene oxide derivative may be contained. It has been found that the above method is particularly preferable. Since this recording layer composition can exhibit the expected performance even at a relatively low coating amount, in terms of quality, problems such as powder drop due to insufficient surface strength do not easily occur, and the production becomes easy. Since the cost can be reduced, this is a more preferable embodiment for implementing the present invention.

The nonionic surfactant used in the present invention is not limited to these. For example, as the hydrophobic group, a saturated or unsaturated oleyl group, lauryl group, cetyl group, stearyl group or the like can be used. Polyalkylene oxide-based nonionic surfactants having saturated aliphatic higher alcohols, or having an alkylphenyl group such as octylphenyl group, nonylphenyl group, etc., and having a suitable chain length of polyethylene oxide as a hydrophilic group; Examples thereof include sorbitan-based nonionic surfactants using sorbitan and the like. Of these, polyethylene oxide-based nonionic surfactants are particularly preferably used. Hydrophilic group / hydrophobic group ratio (HLB) of 8 to 1
Those in the range of 6 are preferred. More preferably, it is more than 10 and 18 or less, more preferably it is more than 11 and 14 or less. The addition amount of the nonionic surfactant is 0.5 to 20% by weight, preferably 1 to 10% by weight based on the total solid content of the coating composition.
Is adjusted within the range. A nonionic surfactant having a molecular weight of 300 to 2,000 is particularly preferably used because it has particularly excellent performance of improving ink absorbency.

In the present invention, the porous pigment constituting the recording layer includes aluminum hydroxide, magnesium hydroxide, aluminum oxide, magnesium oxide, magnesium carbonate, precipitated calcium carbonate, sodium aluminosilicate, aluminum silicate, magnesium silicate, and silicate. Calcium, amorphous silica, calcined clay, diatomaceous earth, activated clay, etc., natural or synthetic inorganic pigments, or styrene, acrylic, urea resin, melamine resin, benzoguanamine resin organic pigments alone or in combination Can be appropriately selected and used, but is not necessarily limited thereto. If necessary, general pigments, for example, inorganic pigments such as calcium carbonate, calcium sulfate, barium sulfate, kaolin, talc, titanium dioxide, zinc oxide, zinc carbonate, and satin white, styrene, acrylic, and urea Resin-based, melamine-based, and benzoguanamine-based organic pigments can also be used in combination. Amorphous silica-based pigments have a relatively low refractive index and are excellent in porous properties such as oil absorption and pore volume, among the various pigments exemplified above. It is particularly preferably used for the purpose of improving ink receptivity.

As the binder for the recording layer, various water-soluble resins and water-dispersible resins can be exemplified. When a nonionic surfactant is added as described above, the recording tends to slightly blur. Bleeding can be improved by adding a water-dispersible resin such as various latexes as a binder. For example, acrylic latex can be appropriately selected from polymer latexes mainly containing various acrylates and derivatives thereof, which are commercially available as ordinary binders, fiber treatment agents, antistatic treatment agents, and the like. . By using an acrylic latex as a part of the binder, there is an effect of preventing the occurrence of bleeding that makes the dot shape irregular. Although this mechanism is not always clear, the acrylic latex is included in the composition of the paper surface, and the tension that spreads the ink droplet in the plane direction at the boundary of the ink droplet / air / paper surface that is ejected during printing is applied. Is smaller than the cohesive force of the ink droplet, so it is estimated that the ink droplet is less likely to spread. Other binders include starch and derivatives thereof, carboxymethylcellulose, hydroxyethylcellulose, casein, gelatin, natural or semi-synthetic polymer compounds such as soy protein, or polyvinyl alcohol resin and silyl-modified polyvinyl alcohol, cationic polyvinyl alcohol and the like. Derivatives, water-soluble resins such as polyvinyl butyral resins, polyethylene imine resins, polyvinyl pyrrolidone resins, polyacrylamide resins, poly (meth) acrylic acid resins, polyacrylic ester resins, polyamide resins, polyester resins, urea resins, Melamine resin, polystyrene resin, styrene / butadiene copolymer, methyl methacrylate / butadiene copolymer,
A water-dispersible resin such as a vinyl copolymer resin such as an ethylene-vinyl acetate copolymer, or a polymer modified product in which an anionic or cationic residue is introduced into the above resins, and appropriately selected from known materials. The obtained material can be used in combination with the above-mentioned acrylic latex.

In the recording layer, in addition to the above, a polyethyleneimine resin, a polyamine resin, a polyamide resin,
Polyamide epichlorohydrin-based resins, polyamine epichlorohydrin-based resins, polyamide polyamine epichlorohydrin-based resins, polydiallylamine-based resins, dicyandiamide condensates and other cationic high-molecular compounds can also be contained, and if necessary, pigment dispersants and thickeners A defoaming agent, a defoaming agent, a foaming agent, a release agent, a penetrating agent, a wetting agent, a thermal gelling agent, a lubricant and other various auxiliaries known in the art can be used.

The coating amount of the recording layer is not particularly limited, and can be appropriately determined according to the required recording quality. As described above, a binder containing a porous pigment and an acrylic latex is used. The desired performance can be exhibited even at a low coating amount of 10 g / m ² or less due to the recording layer composition in which a non-ionic surfactant composed of a polyethylene oxide derivative is contained in the recording layer.
The coating amount is preferably 0.5 to 20 g / m ² , more preferably 1 to 10 g / m ² .

As the pulp constituting the paper used for the support of the present invention, for example, softwood bleached kraft pulp (hereinafter, referred to as pulp)
NBKP) and hardwood bleached kraft pulp (hereinafter LBK)
Chemical pulp such as P), mechanical pulp such as GP, BCTMP and MP, non-wood raw material pulp obtained from kenaf or the like, or pulp usually used for papermaking such as DIP can be used. Also, for example, polyethylene, polypropylene, polyolefin-based fibers such as ethylene-propylene copolymer, and polystyrene, ethylene-vinyl acetate copolymer, polyvinyl chloride, polyvinyl fibers such as polyvinylidene chloride, 6-nylon, Polyamide fibers such as 66-nylon, polyethylene succinate, polycaprolactone, polylactic acid, polyhydroxybutyrate.
An aliphatic polyester fiber such as a valerate copolymer, a vinylon fiber or the like can be mixed and used in the pulp. Further, if necessary, talc, kaolin, calcined kaolin, calcium carbonate, amorphous silica, diatomaceous earth, titanium oxide, activated clay, inorganic pigments such as barium sulfate, urea formalin resin, nylon powder, and organic pigments such as polyethylene powder are used as fillers. Can be added.

The above-mentioned materials are produced by paper-making by a method usually used for acid or neutral paper-making. The paper used as the support of the ink jet recording medium of the present invention may include, if necessary, a sizing agent represented by a rosin-based sizing agent, an alkenyl succinic anhydride, an alkyl ketene dimer, an oxidized starch, an enzyme-modified starch Starches such as cation-modified starch, esterified starch and etherified starch, polyvinyl cellulose such as methyl cellulose, ethyl cellulose, carboxymethyl cellulose, methoxy cellulose, hydroxyethyl cellulose, fully or partially saponified polyvinyl alcohol, carboxy-modified polyvinyl alcohol, and silanol-modified polyvinyl alcohol. Alcohols, polyacrylamide, polyvinylpyrrolidone,
Acrylic amide / acrylic ester copolymer, acrylamide / acrylic ester / methacrylic acid copolymer, alkali salt of styrene / maleic anhydride copolymer, alkali salt of isobutylene / maleic anhydride copolymer, casein, etc. , Natural or synthetic water-soluble polymer compounds, polyvinyl acetate, polyurethane, polyacrylic acid,
Polyacrylate, polybutyl methacrylate,
Materials such as latex such as styrene-butadiene copolymer, vinyl chloride-vinyl acetate copolymer, styrene-butadiene-acrylic copolymer, and water-dispersible polymer compound, or impregnation or coating It is also possible to use one that has been processed by the method.

Means for coating the recording layer on the support include a size press, a gate roll, a roll coater, a bar coater, an air knife coater, a rod blade coater, a blade coater, a gravure coater, a die coater, a curtain coater and the like. Normal coating means can be used as appropriate.

The present invention provides a recording medium having improved ink absorbency, which is used for ink-jet recording for performing high-speed printing. The inventor of the present invention has determined that the desired high-speed ink jet printing suitability has a decisive influence on the water absorption characteristics of the paper 400 ms after the ink droplets have come into contact with the surface. By defining the coefficient at the same time, it has been found that a recording medium having excellent ink absorbency and high-speed printability can be obtained for the first time. The recording medium excellent in high-speed printing specified in the present invention has a transfer amount of distilled water to the recording medium of 30 ml / m ² or more at a contact time of 20 ° (ms) and an absorption coefficient of 1.
It has a significant feature in adjusting to 3 to 7 ml / [m ² · √ (ms)]. The two physical properties relating to the water absorption of the recording medium in an extremely short contact time are, for example, Kyowa Seiko Co., Ltd. Dynamic Scanning Liquid Absorption Meter (DSA)
Can be measured using any of the above methods. Contact time 20√
The transfer amount of distilled water to the recording medium in (ms) is preferably 35 ml / m ² or more, and more preferably 40 ml / m ^2.
Although there is no particular upper limit, for example, 100 ml / m
² The absorption coefficient is in the above range and preferably 1.
It is at least 5 ml / [m ² · √ (ms)], more preferably at most 6 ml / [m ² · √ (ms)].

Dynamic scanning absorption liquid meter (dynamic sc)
Annealing Absorptometer; DSA,
Paper and Paper Technical Journal, Vol. 48, May 1994, 88-92
Page, Kuganei Shigenori) is an apparatus that can accurately measure the amount of water absorption in an extremely short time. The dynamic scanning absorptiometer reads the speed of the absorptive liquid directly from the movement of the meniscus in the capillary,
A method in which a sample is made into a disk shape, and a liquid-absorbing head is spirally scanned on the disk. The scanning speed is automatically changed according to a preset pattern, and the number of points required for one sample is measured. This is an automated measurement.
The liquid supply head for the paper sample is connected to the capillary via a Teflon tube, and the position of the meniscus in the capillary is automatically read by an optical sensor.

The recording medium of the present invention has excellent performance for printing and recording by a high-speed ink jet printer. The ink used for the recording medium is a dispersion of a water-insoluble disperse dye or a water-soluble dispersion. Direct dyes or at least one or more of water-soluble acid dyes are contained as coloring agents, and further, if appropriate, wetting agents, dye dissolving agents, preservatives,
A water-based ink containing an auxiliary agent such as a fungicide is used. Examples of water-soluble direct dyes include CI. Direct Black 38, CI. Direct Yellow 5, CI. Direct Blue, CI. Direct Red 28 is CI. Acid Black, CI. Acid Yellow, CI. Acid Blue, CI. Acid red is exemplified, but is not necessarily limited to these.

[0023]

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. The methods for measuring various physical properties in the examples are shown below. 1) Drying time for printing 360 dpi line head, printing speed 150 mm
/ S high-speed inkjet printer (Model: Canon)
P-400C (manufactured by Canon Inc.), two-color printing (blue = magenta + cyan) was performed, and after printing, the surface of the paper was observed, and the time until glossiness due to ink moisture was lost was measured. The print drying time was measured. 2) Print density High-speed inkjet printer (Model: Canon P-
400 dpi, manufactured by Canon Inc.)
After printing all solid black in a single color at the recording density described above and leaving it in a normal temperature and normal humidity environment, the reflection density of the printed portion was measured using a Macbeth RD-914 reflection densitometer.

3) Sharpness of printing High-speed ink jet printer (model: Canon P-
400 dpi, manufactured by Canon Inc.)
A monochromatic fine line was printed at a recording density of, and after being left and conditioned at room temperature and normal humidity, the sharpness of the printed portion was evaluated with the naked eye. "5" indicates that the print is fine and no line fluctuation due to bleeding is observed. "4" indicates that the print is fine but line fluctuation is observed in some places. The evaluation was made in five steps: "3", "2", where the fineness was impaired, and the adjacent fine lines were slightly unclear, and "1", where the fineness was poor, and the fine lines were difficult to identify. 4) Transfer amount and absorption coefficient of distilled water The transfer amount and absorption coefficient of distilled water with respect to the recording medium were determined by measuring the absorption curve of distilled water using a dynamic scanning absorptiometer (model: KS350D, manufactured by Kyowa Seiko Co., Ltd.). It was measured. The absorption curve shows the transfer amount (mL / m ² ) and the square root of the contact time (√ (m
s)) was plotted to obtain a straight line having a constant slope, the value of the amount of transfer after a certain time was measured by interpolation, and the slope of the straight line in the vicinity was calculated as an absorption coefficient.

Example 1 Preparation of Support 1 490 ml of LBKP having a freeness (CSF) of 490 ml was dispersed in water to give 5,000 parts of a pulp slurry having a solid content of 2%. The sizing agent was added in an amount of 0.05 part as a non-volatile content, 2.0 parts as a solid content of a 10% aqueous solution of cationized starch, and 0.5 part as a solid content of a sulfate band aqueous solution. A sheet having a basis weight of 80 g / m ² was formed. An aqueous solution of oxidized starch having a concentration of 4% was applied to this sheet using a size press so as to have an adhesion amount of 30 ml / m ^2, and dried to prepare high quality paper having a Steckigt sizing degree of 5 seconds and an ash content of 15%. Preparation of Coating Solution 1 for Recording Layer Amorphous silica pigment (trade name: Fine Seal X-60,
100 parts of a polydiallyldimethylammonium chloride resin (trade name: Unisense CP)
-103, 12% aqueous solution 400 of Senka Kogyo Co., Ltd.)
And 4 parts of a 4% aqueous solution of silyl-modified polyvinyl alcohol (trade name: Kuraray R Polymer R-1130, manufactured by Kuraray Co., Ltd.) were mixed to obtain a recording layer coating liquid having a solid content of 17%. . Coating solution 1 for recording layer was applied to one surface of support 1 using a Myr bar, and the amount of coating after drying was 15 g.
/ M ² after coating and drying, and a linear pressure of 60 kg /
A smoothing treatment was performed using a super calendering apparatus combining a chrome plating roll and a cotton roll adjusted to a cm to prepare an ink jet recording medium. At a contact time of this recording medium of 20 ° (ms) (ie, 400 ms), the transfer amount and the absorption coefficient of distilled water were 60 mL / m2, respectively.
² and 1.5 mL / [m ² · √ (ms)].

Example 2 Preparation of Coating Solution 2 for Recording Layer Amorphous silica pigment (trade name: Fine Seal X-45,
100 parts of a dicyandiamide / polyethylene polyamine copolymer resin (trade name: Neofix E-117, manufactured by Nichika Chemical Co., Ltd.) is dispersed in 400 parts of a 12% aqueous solution, and silyl-modified polyvinyl is prepared. Alcohol (trade name: Kuraray R Polymer R-1130, Inc.)
250 parts of 10% aqueous solution of Kuraray, acrylic cationic emulsion (trade name: Sebian-A46753,
40 parts of a 30% aqueous dispersion (manufactured by Daicel Chemical Industries, Ltd.) L. B. Sorbitan monolaurate surfactant having a molecular weight of about 8.7 and a molecular weight of about 360 (trade name: Rheodol SP-L10, manufactured by Kao Corporation) 2.0% aqueous solution 22
0 parts were mixed to obtain a recording layer coating liquid having a solid content of 19%. A coating liquid 2 for a recording layer was applied to one surface of
After applying using a bar, the applied amount after drying was 12 g / m ^2, and after drying, smoothing was performed with a super calendering device combining a chrome plating roll and a cotton roll adjusted to a linear pressure of 60 kg / cm. , An ink jet recording medium was prepared. Contact time of this recording medium 20√
The transfer amount and absorption coefficient of distilled water in (ms) are 60 mL / m ² and 2.5 mL / [m ² · √ (ms)], respectively.
Met.

Example 3 An ink jet recording medium was prepared in the same manner as in Example 2 except that the coating amount after drying was 6 g / m ² . The transfer amount and the absorption coefficient of distilled water at a contact time of 20 ° (ms) of the recording medium were 30 mL / m2, respectively.
² and 2.0 mL / [m ² · √ (ms)]. Example 4 Preparation of Coating Solution 3 for Recording Layer 100 parts of an amorphous silica pigment (trade name: Syloid ED-3, manufactured by Grace Davison KK) was added to a polyacrylamide derivative resin (trade name: Safomer ST-33).
00, manufactured by Mitsubishi Chemical Corporation) and dispersed in 400 parts of a 12% aqueous solution, and silyl-modified polyvinyl alcohol (trade name: Kuraray R Polymer R-1130, manufactured by Kuraray Co., Ltd.) 10
% Aqueous solution, 40 parts of 30% aqueous dispersion of acrylic cationic emulsion (trade name: Sebian-A46753, manufactured by Daicel Chemical Industries, Ltd.) L. B. Is 1
0, polyethylene oxide lauryl ether surfactant having an average molecular weight of 370 (trade name: Neugen ET-10)
(2, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) was mixed with 220 parts of a 2.5% aqueous solution to obtain a recording layer coating liquid having a solid content of 19%. The coating liquid 3 for a recording layer was applied to one surface of the support 1 using a Myr bar so that the coating amount after drying was 6 g / m ² , dried, and then adjusted to a linear pressure of 60 kg / cm. The ink jet recording medium was prepared by performing a smoothing treatment with a super calendering apparatus combining a chrome plating roll and a cotton roll. The transfer amount and absorption coefficient of distilled water at a contact time of 20 ° (ms) of this recording medium were 60 mL each.
/ M ² and 2.5 mL / [m ² · √ (ms)].

Example 5 Preparation of Coating Solution 4 for Recording Layer Amorphous silica pigment (trade name: Silojet P-40)
5, 100 parts of Grace Devison Co., Ltd.) was replaced with 1 part of polydiallyldimethylammonium chloride resin (trade name: Unisense CP-101, manufactured by Senka Co., Ltd.).
Dispersed in 400 parts of a 2% aqueous solution, and silyl-modified polyvinyl alcohol (trade name: Kuraray R Polymer R-1130,
250 parts of 10% aqueous solution, acrylic cationic latex (trade name: Sumikaflex C)
GC-201NF, manufactured by Sumitomo Chemical Co., Ltd.), 30 parts of a 40% aqueous dispersion; L. B. 16, average molecular weight 1020
Polyethylene oxide lauryl ether surfactant (trade name: Emulgen 147, manufactured by Kao Corporation) 2.0%
An aqueous solution (220 parts) was mixed to obtain a recording layer coating liquid having a solid content of 19%. A coating liquid 4 for a recording layer is applied to one surface of the support 1,
Using a Myer bar, apply the coating amount after drying to 4 g / m ² , dry it, and smooth it with a super calendering device combining a chrome plating roll and a cotton roll adjusted to a linear pressure of 60 kg / cm. Was performed to prepare an ink jet recording medium. Contact time 2 of this recording medium
At 0 ° (ms), the transfer amount and absorption coefficient of distilled water were 70 mL / m ² and 3.5 mL / [m ² · √ (m
s)].

Example 6 Preparation of Coating Solution 5 for Recording Layer Amorphous silica pigment (trade name: Silojet P-41)
2, 100 parts of Grace Devison Co., Ltd.) was replaced with a polyacrylamide derivative resin (trade name: SAFTMER ST)
-3300, 12% aqueous solution of Mitsubishi Chemical Corporation 400
And a silyl-modified polyvinyl alcohol (trade name: Kuraray R Polymer R-1130, manufactured by Kuraray Co., Ltd.), 250 parts of a 10% aqueous solution, acrylic cationic latex (trade name: Sumikaflex CGC-201)
NF, manufactured by Sumitomo Chemical Co., Ltd.), 30 parts of a 40% aqueous dispersion; L. B. Is 12, a polyethylene oxide nonylphenyl ether surfactant having an average molecular weight of 550 (trade name: Neugen EA-120, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.)
A 2.0% aqueous solution (220 parts) was mixed to obtain a recording layer coating liquid having a solid content of 19%. The coating liquid 5 for the recording layer was coated on one surface of the support 1 with a Myr bar, and the coating amount after drying was 8 g / g.
m ² and so as coated, dried, linear pressure 60 kg / c
The ink was subjected to a smoothing treatment using a super calendering device combining a chrome plating roll and a cotton roll adjusted to m, thereby preparing an ink jet recording medium. The transfer amount and absorption coefficient of distilled water at a contact time of 20 ° (ms) of this recording medium were 80 mL / m ² and 3.2 mL /
[M ² · √ (ms)].

Comparative Example 1 Preparation of Coating Solution 6 for Recording Layer Amorphous silica pigment (trade name: Fine Seal X-45,
100 parts of a dicyandiamide / polyethylene polyamine copolymer resin (trade name: Neofix E-117, manufactured by Nichika Chemical Co., Ltd.) is dispersed in 400 parts of a 12% aqueous solution, and silyl-modified polyvinyl is prepared. Alcohol (trade name: Kuraray R Polymer R-1130, Inc.)
250 parts of 10% aqueous solution of Kuraray, acrylic cationic emulsion (trade name: Sebian-A46753,
Daicel Chemical Industries, Ltd.) 30% aqueous dispersion 40 parts water 22
0 parts were mixed to obtain a recording layer coating liquid having a solid content of 19%. On one surface of the support 1, a coating liquid 6 for a recording layer was
After applying using a bar so that the applied amount after drying becomes 6 g / m ^2, and then drying, a smoothing treatment is performed by a super calendering apparatus combining a chrome plating roll and a cotton roll adjusted to a linear pressure of 60 kg / cm. , An ink jet recording medium was prepared. Contact time of this recording medium 20√
The transfer amount and absorption coefficient of distilled water in (ms) are 20 mL / m ² and 1.0 mL / [m ² · √ (ms)], respectively.
Met.

Comparative Example 2 Preparation of Coating Solution 7 for Recording Layer 100 parts of an amorphous silica pigment (trade name: Syloid ED-3, manufactured by Grace Davison KK) was added to a polyacrylamide derivative resin (trade name: Saftomer) ST-33
00, manufactured by Mitsubishi Chemical Corporation) and dispersed in 400 parts of a 12% aqueous solution, and silyl-modified polyvinyl alcohol (trade name: Kuraray R Polymer R-1130, manufactured by Kuraray Co., Ltd.) 10
% Aqueous solution, 40 parts of 30% aqueous dispersion of acrylic cationic latex (trade name: Sumikaflex CGC-201NF, manufactured by Sumitomo Chemical Co., Ltd.) L.
B. Is 1.0, polyethylene oxide sorbitol tetraoleate surfactant having an average molecular weight of 2300 (trade name: Reodol 430, manufactured by Kao Corporation) 1.0%
An aqueous solution (220 parts) was mixed to obtain a recording layer coating liquid having a solid content of 19%. On one surface of the support 1, a recording layer coating liquid 7
Using a myr bar, apply the coating amount after drying to 6 g / m ² , dry it, and smooth it with a super calendering device combining a chrome plating roll and a cotton roll adjusted to a linear pressure of 60 kg / cm. Was performed to prepare an ink jet recording medium. Contact time 2 of this recording medium
At 0 ° (ms), the transfer amount and absorption coefficient of distilled water were 40 mL / m ² and 1.2 mL / [m ² · √ (m
s)].

Example 7 Preparation of Support 2 490 ml of LBKP having a freeness of 490 ml (CSF) was dispersed in water to obtain 5000 parts of a pulp slurry having a solid content of 2%. The slurry was modified with 8 parts of amorphous silica and modified. The rosin sizing agent was added as a non-volatile component in an amount of 0.03 part, a cationized starch in a 10% aqueous solution was added as a solid component in an amount of 2.5 parts, and a sulfate band aqueous solution was added in an amount of 0.5 part as a solid component. A sheet having a basis weight of 80 g / m ² was formed. An aqueous solution of oxidized starch having a concentration of 4% was applied to this sheet using a size press so as to give an adhesion amount of 30 ml / m ^2, and dried to prepare high quality paper having a Stekigt sizing degree of 10 seconds and an ash content of 5%. A coating liquid 4 for a recording layer is applied to one surface of the support 2 using a Myr bar so that the coating amount after drying is 6 g / m ² .
After drying, the ink jet recording medium was prepared by performing a smoothing treatment with a super calendering apparatus combining a chrome plating roll and a cotton roll adjusted to a linear pressure of 60 kg / cm. Contact time of this recording medium 20 ° (ms)
, The transfer amount and absorption coefficient of distilled water are 80 m each.
L / m ² and 2.8 mL / [m ² · √ (ms)].

Example 8 Preparation of Coating Liquid 8 for Recording Layer Amorphous silica pigment (trade name: Mizukasil P-78A,
100 parts of Mizusawa Chemical Co., Ltd.) was replaced with a polydiallyldimethylammonium chloride resin (trade name: Unisense C)
P-101, manufactured by Senka Co., Ltd.), dispersed in 400 parts of a 12% aqueous solution, and silyl-modified polyvinyl alcohol (trade name: Kuraray R Polymer R-1130, manufactured by Kuraray Co., Ltd.) 250 parts of an 8% aqueous solution, acrylic Cationic latex (trade name: Sumikaflex CGC-201N)
F, manufactured by Sumitomo Chemical Co., Ltd.), 30 parts of a 40% aqueous dispersion, and L. B. A 2.0% aqueous solution 220 of polyethylene oxide lauryl ether surfactant having an average molecular weight of 1020 (trade name: Emulgen 147, manufactured by Kao Corporation)
Were mixed to obtain a recording layer coating liquid having a solid content of 18.5%. On one surface of the support 2, a coating liquid 8 for a recording layer is
After applying using a bar so that the applied amount after drying becomes 6 g / m ^2, and then drying, a smoothing treatment is performed by a super calendering apparatus combining a chrome plating roll and a cotton roll adjusted to a linear pressure of 60 kg / cm. , An ink jet recording medium was prepared. Contact time of this recording medium 20√
The transfer amount and absorption coefficient of distilled water in (ms) are 70 mL / m ² and 3.2 mL / [m ² · √ (ms)], respectively.
Met.

Comparative Example 3 Preparation of Coating Solution 9 for Recording Layer Amorphous silica pigment (trade name: Mizukasil P-78A,
100 parts of Mizusawa Chemical Co., Ltd.) was replaced with a polydiallyldimethylammonium chloride resin (trade name: Unisense C)
P-101, manufactured by Senka Co., Ltd.) and dispersed in 400 parts of a 12% aqueous solution, and modified polyvinyl alcohol (trade name: Kuraray R Polymer R-1130, manufactured by Kuraray Co., Ltd.), 250 parts of an 8% aqueous solution, and H.P. L. B. Is 16, average molecular weight is 10
6. Polyethylene oxide lauryl ether surfactant 20 (trade name: Emulgen 147, manufactured by Kao Corporation)
300 parts of a 5% aqueous solution was mixed to obtain a recording layer coating liquid having a solid content of 18.5%. The coating liquid 9 for the recording layer was applied to one surface of the support 2 using a Myr bar, and the coating amount after drying was 6 g / g.
m ² and so as coated, dried, linear pressure 60 kg / c
The ink was subjected to a smoothing treatment using a super calendering device combining a chrome plating roll and a cotton roll adjusted to m, thereby preparing an ink jet recording medium. The transfer amount and absorption coefficient of distilled water at a contact time of 20 ° (ms) of the recording medium were 80 mL / m ² and 7.2 mL /
[M ² · √ (ms)].

[0035]

[Table 1]

[0036]

The results of the evaluation of the print drying time, print density, and print clarity of the above 12 types of recording media are shown in Table 1. As is clear from Table 1, the examples of the present invention are as follows.
As compared with the comparative example, the ink jet recording medium was excellent in recording density, print drying property and print clarity.

Continued on the front page F term (reference) 2C056 EA04 FC06 2H086 BA15 BA21 BA31 BA33 BA34 BA41

Claims (7)

[Claims] 1. An ink jet recording medium comprising a recording layer provided on at least one surface of a support made of paper,
The transfer amount of distilled water to the recording medium at a contact time of 400 ms measured by a dynamic scanning absorptiometer is 30 ml / m ² or more, and the absorption coefficient is 1.3 to 7 ml / [m ² · √ (ms)]. An ink jet recording medium characterized by the above-mentioned. 2. The ink jet recording medium according to claim 1, wherein the recording layer contains a porous pigment, a binder and a nonionic surfactant. 3. The coating amount of the recording layer is 1 to 10 g / m per side.
^3. The ink jet recording medium according to claim 1, wherein the range is 2. 4. The ink jet recording medium according to claim 2, wherein the nonionic surfactant contained in the recording layer is a polyethylene oxide derivative. 5. The nonionic surfactant contained in the recording layer has a hydrophilic group / hydrophobic group ratio (HLB) in the range of 8 to 18. Or the inkjet recording medium according to 4. 6. The ink jet recording medium according to claim 2, wherein the molecular weight of the nonionic surfactant contained in the recording layer is in the range of 300 to 2,000. 7. The ink jet recording medium according to claim 1, wherein the binder is at least one selected from a polymer or copolymer latex containing acrylic latex and vinyl acetate.