JPH01241486A - Recording material and recording method using the same - Google Patents

Abstract

PURPOSE:To obtain a recording material having rapid ink-absorbing properties, being excellent in dot shape, having a favorable coefficient of bleeding of ink droplets and suitable for forming highly fine clear images and a recording method using the same, by using a cationic filler and specifying the ash content of a base paper and the stockigt sizing degree of a recording material. CONSTITUTION:A low sizing degree base paper comprising s fibrous substance and a cationic filler is used as a base. The content of the filler in the base paper in terms of ash quantity according to JIS-P-8128 is 2-15wt.%, and the Stockigt sizing degree of a recording paper comprising a coated layer on the base paper is controlled to within the range of 1-15sec. An ash content of less than 2% causes heavy bleeding of ink droplets in the fiber directions on the surface of the base paper, a poor dot shape and excessively heavy bleeding of the ink droplets. An ash content of more than 15% causes the recording paper itself to be devoid of stiffness, and causes dusting from the base paper. If the sizing degree of the base paper is less than 4sec, a binder in a coating liquid is conspicuously absorbed into the base paper during coating, and dusting from the surface of the coated layer occurs.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a recording material suitably used in an inkjet recording method, and in particular has excellent water-based ink absorption and coloring properties, and is capable of producing fine and clear recorded images with high rust. The present invention relates to a recording material and a recording method suitable for providing.

Furthermore, the present invention relates to a recording material with excellent storage stability of recorded images, particularly water resistance, and a recording method using the same.

(Prior art) Conventionally, recording materials for inkjet use include: (1) general paper containing valves as its main component and made into a paper of low size to resemble filter paper or blotting paper; (2) A coating layer is provided on a base material using a pigment such as silica or zeolite that has 7τ pores, has a large oil absorption ti1, and adsorbs the coloring component in the ink.

Although the above recording material (1) is low cost and has excellent ink absorption, the ink penetrates deeply into the fiber layer of the paper, so the coloring property of the coloring material in the ink is 3 (3), and the ink is absorbed along the fibers on the paper surface, a phenomenon called feathering occurs, which causes the dots to become jagged instead of circular, and the dots to become too large, resulting in a decrease in resolution and the ability to obtain high-quality images. There was a drawback that there was no

For this reason, such non-coated paper has been used exclusively for monochrome recording, personal computer terminals, and other applications that do not necessarily require images with relatively low resolution and high density.

The recording material (2) has conventionally been used, for example, in JP-A-58-
As disclosed in Japanese Patent Application Laid-open No. 132586 and Japanese Patent Application Laid-open No. 59-35977, coated paper based on relatively high-sized paper (such as commercially available wood-free paper) has been used.

In such coated paper, the ink absorbing layer is porous and uniform, so images with appropriate ink absorbency and excellent dot shape and resolution can be obtained.

However, in a recording method that requires color images of higher quality and resolution, it is necessary to absorb and fix more ink at high speed. Conventionally, this has been dealt with by increasing the coating amount of the ink absorption layer and increasing the void volume of the ink absorption layer, but as the coating layer becomes thicker, the recording material becomes more difficult to handle, such as in the conveyance system of the recording device. When the coating layer comes into contact with the base paper, the coating layer peels off from the base paper, which causes a so-called powder-shedding problem. Such paper dust not only stains the inside of the apparatus, but also causes nozzle clogging of the inkjet head, which is a particular problem.

Furthermore, in the manufacturing process, a large amount of the coating liquid must be rapidly dried, which causes migration of the binder in the coating liquid, resulting in a severe decrease in the strength of the coating layer and ink absorption. By relaxing the drying conditions, for example,
Although such problems can be solved to some extent by dividing the coating into several coats, there are reports that this increases manufacturing costs.

One method for solving these drawbacks is to use paper with a low sizing degree as the base paper and provide a porous pigment layer thereon. For example, JP-A-59-185690
The publication exemplifies a recording material having a coating layer containing silica having specific physical properties on a base paper having a size degree of 4 seconds or less.

(Problems to be Solved by the Invention) This type of recording material has the advantage that even when a relatively thin ink-receiving layer is provided, a recording material with excellent ink absorption properties can be obtained.

However, even with such recording materials, (1) a large amount of ink penetrates deeply into the base paper, resulting in low print density; (2) the ink-receiving layer is thin and cannot hold much ink, so the base paper When the ink is absorbed by the navigation recording material (1)
Deterioration of resolution and print quality due to poor dot shape or excessive smearing of adhered ink droplets as mentioned in (3) The binder being applied during coating is absorbed into the low-size base paper, resulting in (4) The dye in the ink cannot be retained in the ink-receiving layer and is absorbed by the base paper, resulting in poor water resistance, etc. It has the following problems.

These problems are thought to be caused not only by the properties of the ink-receiving layer, but also by the properties of the base paper and the ink-receiving layer, but conventionally, there is no known method to solve the problem described in F by focusing on their mutual physical properties. It has not been done.

Therefore, the object of the present invention is to solve the above-mentioned problems, to have quick ink absorbency even if the coating layer is thin, and especially to have an excellent dot shape and a suitable ink droplet bleeding rate. An object of the present invention is to provide a recording material and a recording method suitable for forming high-definition and clear images.

A further object of the present invention is to provide a recording material for high-rust fine images that causes less powder falling and can be produced at a relatively low cost, and a recording method using the same.

Still another object of the present invention is to provide a recording material and a recording method that provide good water resistance even if the coating layer is thin and provide images with excellent light resistance.

The above and other objects of the present invention are achieved by the present invention as follows.

(Means for Solving the Problems) That is, the present invention provides a recording material in which one coating layer is provided on a base paper made of a fibrous substance and a filler, in which the filler is cationic, and the base paper is A recording material having an ash content of 2 to 15% according to JIS-P-8128 and a Steckigt sizing degree of 1 to 15 seconds and ink droplets containing a water-soluble dye. This is a recording method characterized in that recording is performed by attaching the above-mentioned recording material to the recording material.

(Function) That is, the present inventor aimed to obtain a recording material that solves the drawbacks of the prior art mentioned above as a general recording material for recording using water-based ink and a recording material for inkjet recording. As a result of extensive research, we have found that the above-mentioned recording material provides high ink absorption, excellent color properties, and high image density even if the coating layer is thin, and the adhered ink droplets do not smear too much and have an appropriate smear rate and dot shape. It was discovered that this recording material has a high degree of rust and is suitable for providing fine, high-quality images.

(Preferred Embodiments) Next, the present invention will be described in detail by citing preferred embodiments.

The first feature of the recording material of the present invention is that a low-size base paper made of a fibrous substance and a cationic filler is used as the base material, and the second feature is that the above-mentioned The content of the cationic filler is 2 to 15% in terms of ash content according to JIS-P-8128, and the third feature is that the recording material has a coating layer on the base paper. J I
Steckigt size degree by 5-P-8122 from 1 to 1
This means that the time is within the range of 5 seconds.

The fibrous material of the base paper used in the present invention is not particularly limited, and is mainly composed of wood bulbs typified by conventionally known LBKP and NBKP, but synthetic fibers or glass fibers may be mixed if necessary.

It is essential that the base paper filler used in the present invention is cationic.

The cationic filler referred to in the present invention refers to the ability of acid dyes and/or direct dyes contained in ink used for recording to ionically bond with functional groups such as sulfonic acid groups and carboxyl groups. It is a filler that has a positive surface potential on the surface.

Specific examples of the above-mentioned fillers include the following.

(1) Fillers with positive surface potential, such as general alumina obtained by firing aluminum hydroxide, cationic fillers with basic oxides such as calcium oxide and magnesium oxide on their surfaces; Examples include synthetic silicates.

In particular, alumina is preferably used in the present invention. Examples of such alumina include general alumina powder, fused alumina, spherical alumina particles, α-alumina, γ-alumina, which are used as materials for ceramics, m-tools, abrasive materials, etc., as well as ultrafine particles produced by the vapor phase method. Examples include alumina (Nippon Aerosil Group), activated alumina for use as a catalyst or activator (manufactured by Iwatani Chemical Industry Co., Ltd.), and colloidal aqueous dispersion of alumina hydrate (manufactured by Nissan Chemical Industry Co., Ltd.).

(2) Conventionally known fillers, such as clay, talc,
The surface of kaolinite, titanium oxide, calcium carbonate, etc., finely powdered silicic acid, synthetic silicates, etc. is coated with a cationic substance such as a cationic resin or a cationic silane coupling agent.
Its surface is cationic.

An example of the cationic resin mentioned here is molecule.

Examples include resins having primary to tertiary amines or quaternized ammonium bases in the main chain or side thereof, and these are known as water resistance agents (dye fixing agents). is commercially available.

In the present invention, it is particularly preferable to use hydrophilic and water-insoluble cationic resins so that the cationic resins adsorbed on the filler surface during the papermaking process do not flow out.

Examples of cationic silane coupling agents include those having primary to tertiary amines or quaternized ammonium bases in their molecular structures; specific examples of these include N-β (aminoethyl); γ-aminopropyltrimethoxysilane, N-β(aminoethyl)γ-aminopropylmethyldimethoxysilane, γ-aminopropyltrimethoxysilane, γ-[bis(
β- and droxyethyl)]-aminopropyltriethoxysilane, hexamethyldisilazane, γ-anilinopropyltrimethoxysilane, octadecyldimethyl[3-(trimethoxysilyl)propyl]ammonium chloride, N-β-(N-vinyl Examples include special aminosilanes commercially available under the trade names of benzylaminoethyl)-γ-aminopropyltrimethoxysilane hydrochloride and 5H-6026, 5Z-6050 (manufactured by t-ray Silicon).

The silyl group in the silane coupling agent molecule as mentioned above forms a bond with the hydroxyl group on the surface of an inorganic pigment such as silica.
By treating a filler with these silane coupling agents, a filler having a primary to tertiary amine or a quaternized ammonium base on its surface can be obtained. Considering the strength of the bond between the treatment agent and the filler itself, it is preferable to perform surface treatment using a silane coupling agent.

Of course, in the present invention, the method for preparing the filler whose surface has been cationically treated is not limited to the above-mentioned method. A method of treating the surface with aluminum, a method of similarly treating the surface with a titanate coupling agent having a cationic group in the molecule, a method of treating the surface with a basic or amphoteric metal oxide, and other methods. Any method may be used as long as it satisfies the requirements of this case.

Methods for treating the surface of fillers with such treatment agents include a dry method in which a solution of the treatment agent is directly sprayed onto the filler, and a method in which the filler is dispersed in a solvent and treated while stirring. Examples include a wet method in which these processing agents are added, mixed and then dehydrated and dried, or in which these processing agents are similarly added to the filler dispersion prepared in the manufacturing process.

In this case, the ratio of the processing agent to the filler is 0.1 to 20% by weight, more preferably 0.1 to 20% by weight of the processing agent relative to the filler.
, 5 to 5%.

When the recording material of the present invention is obtained by making a base paper using a filler that is not cationic as in the past, the dye adsorption in the ink is poor (<O, D), and the coloring property is decreased, resulting in poor clarity. In addition, the water resistance of the image is insufficient.

In addition, according to the knowledge of the present invention, in particular, the bleeding and dot shape of ink droplets attached to the recording material are greatly affected by the ash content of the base paper in this type of paper, and the ash content is less than 2%. In some cases, the adhered ink droplets smear significantly along the fiber direction of the surface of the base paper, resulting in poor dot shape and the smearing of the ink droplets being larger than necessary. On the other hand, if it exceeds 15%, it is not preferable because the recording material itself will lose its stiffness and powder will fall off from the base paper.

The base paper used in the present invention is made by using the above-mentioned materials and conventionally known papermaking aids, sizing agents, retention improvers, paper strength enhancers, etc. as necessary.

Note that, from the viewpoint of the color development of the coloring material, the storage stability of recorded images, etc., the paper making method is preferably a neutral paper making method rather than an acid paper making method using sulfuric acid band.

Although the size degree of the base paper used in the present invention is not particularly limited, the size degree of the base paper is preferably in the range of 4 to 15 seconds. In particular, if the size of the base paper is less than 4 seconds, the binder in the coating liquid will be significantly absorbed into the base paper during coating.
This is undesirable because powder falls off on the surface of the coating layer. The sizing degree of the base paper referred to here is a value adjusted by adding an internal sizing agent 111 during paper making, and the surface size includes the coating layer.

Therefore, the coating layer of the recording material of the present invention is a layer formed mainly of a hydrophilic resin containing a surface sizing agent, but if necessary, it may also be a layer containing an inorganic pigment, especially a silicon-containing pigment. good.

Examples of the silicon-containing pigment contained in the coating layer include conventionally known natural or synthetic silicon-containing pigments such as fine powder silicic acid, magnesium silicate, calcium silicate, aluminum silicate, talc, and diatoms.

The pigments used here have an average secondary particle diameter of 1 to 2 in order to obtain excellent color properties, resolution, and ink absorption.
Preferably, the particles have a specific surface area of 0 μm and a specific surface area of 200 m″/g or more, and spherical particles obtained by molding the above-mentioned pigment into a spherical shape as disclosed in JP-A-62-183382 may also be used.

Of course, in the present invention, conventionally known porous pigments may be used in combination within a range that does not impede the object of the present invention.

Suitable hydrophilic resins used in the present invention include, for example, conventionally known water-soluble polymers such as polyvinyl alcohol, starch, oxidized starch, cationized starch, casein, carboxymethyl cellulose, gelatin, hydroxyethyl cellulose, and acrylic resin; SBR latex, MB
One type or a mixture of two or more types of water-dispersible polymers such as R latex and vinyl acetate emulsion are used.

Further, the preferred ratio of the pigment to the hydrophilic resin in the present invention is within the range of 0 to 5/1. When the amount of binder is less than 5/1, the adhesive force of the binder within the ink receiving layer decreases, causing a problem of powder falling off.

In the present invention, the coating layer has a solid content of 0.5 to 8 g/rr.
It is preferable that the coating layer be coated in a range of 1 to 5 g/rn', and more preferably 1 to 5 g/rn'. Providing a coating layer of more than 8 g/rn' causes a problem of powder falling off, and The effect of using the base paper will be weakened and the ink absorption will also be reduced.Also, if the coating amount of the above coating layer is less than 0.5 g/m'', the above-mentioned recording material (1) may be used. cause problems.

Further, it is necessary that the size degree of the recording material in which the above-mentioned coating layer is provided on a low-size base paper is in the range of 1 to 15 seconds. If the time is less than 1 second, the wetting and penetration of the ink droplets into the recording material may be too good, causing the adhered ink droplets to spread too much or
A decrease in D occurs.

On the other hand, if it exceeds 15 seconds, most of the ink absorption will depend on the coating layer within the above range, resulting in insufficient ink absorption.

Furthermore, in the present invention, dye fixing agents (waterproofing agents), fluorescent whitening agents, surfactants, antifoaming agents, p
It may be impregnated with an H adjuster, a fungicide, an ultraviolet absorber, an antioxidant, etc.

Methods for applying the aqueous coating liquid obtained by mixing materials such as direct coating onto the above-mentioned base paper include a bar coater, blade coater, air knife coater, reverse roll coater, gate roll coater, or pigment size coating. All conventionally known methods such as the pressing method can be used.

After the aqueous coating liquid is applied under the above conditions, it is dried using a conventionally known drying method, such as a hot air drying oven, a hot drum, etc., to obtain the recording material of the present invention.

Further, in order to smooth the surface of the coating layer or to increase the surface strength of the coating layer, a tossper calendering process may be used.

The recording method of the present invention is a recording method using the recording material of the present invention, and in this recording method, the ink itself applied to the specific recording material as described above by any recording method may be a known ink. For example, the recording agent is a water-soluble dye represented by a direct dye, an acid dye, a basic dye, a reactive dye, a food coloring, etc., and is particularly suitable as an ink for an inkjet recording method, and is suitable for use with the above-mentioned recording material. For example, C, 1, Direct Black 17.19.32.51 is preferable in combination with C. ．．
71.108.146, 1. Direct Blue 6.22.25.71, 86
, 90, 106, 199, C1, Direct Let 1.4.17.28.83, C11, Direct Yellow 12.24.26.86.
98.142, C, 1, Direct Orange 34.39.44.46.
60, C, 1, Direct Violet 47.48, C, 1,
Direct dyes such as Direct Brown 109 and C,1, Direct Green 59, [:, 1. acid black 2.7.24.26.31
．． 52.63.112.118, C,1, Acid Blue 9.22.40.59.93.
102.104.113.117.120.167.2
29.234, (:, 1. Acid Red 1.6.32.37.51.
52.80.85.87.92.94.115.180
．． 256.317.315, C, 1, Acid Yellow 11.17.23.25.29
, 42, 61, 71, (:, 1. Acidic dyes such as Acid Orange 7.19 and C, 1, Acid Violet 49 are preferred; others: C, 1, Basic Black 2; c, r, Basic Blue 1. 3.5.7.9.24.
25.26.28,29, C,1, Basic Red 1.2.9.12.13.1
4.37, C, 1, Basic Violet 7.14.27 and C
, 1, Food Black 1.2, etc. can also be used.

The above examples of dyes are particularly preferable for inks applicable to the recording method of the present invention, but dyes for inks used in the present invention are not limited to these dyes.

Such water-soluble dyes are generally used in a proportion of about 0.1 to 20f1fJ% in conventional inks, and this proportion may be the same in the present invention.

The solvent used in the water-based ink used in the present invention is water or a mixed solvent of water and a water-soluble organic solvent, and a particularly preferable one is a mixed solvent of water and a water-soluble organic solvent. It contains polyhydric alcohol, which has the effect of preventing ink from drying. Furthermore, as the water, it is preferable to use deionized water rather than ordinary water containing various ions.

The content of the water-soluble organic solvent in the ink is generally 0 to 95% by weight, preferably 10 to 80% by weight, more preferably 15 to 50% by weight based on the total weight of the ink.
i% range.

In addition to the above-mentioned components, the ink used in the present invention may also contain a surfactant, a viscosity modifier, a surface tension modifier, etc., as necessary.

In the method of the present invention, any recording method may be used to apply the ink to the recording material, but an inkjet recording method is preferable. Any method may be used as long as it can apply ink to the recording material, which is a projectile, and a typical method is, for example, IEE Trans Action on Industry Applications (IEE Trans Action on Industry Applications). IEEETr
ans actions on Industry
y 8 applications) Vol, IA-
13, No. 1 (February/March 1977 issue), Nikkei Electronics April 19, 1976 issue, 1973
It is described in the May 29, 1974 issue and the May 6, 1974 issue.

The methods described above are suitable for the method of the present invention.To explain some of them, there is an electrostatic attraction method. A method in which a strong electric field is applied between the ink particles and the ink particles are drawn out one after another from a nozzle, and an information signal is given to the deflection electrodes while the drawn ink flies between the deflection electrodes to record the information. There is a method in which ink particles are ejected in response to an information signal without having to do so, and either method is effective for the method of the present invention.

The second method is to apply high pressure to the ink using a small pump and mechanically vibrate the nozzle using a crystal oscillator, etc., to forcibly eject microscopic ink particles. At the same time as injection, +? It is charged according to the r-report signal. When the charged ink particles pass between the deflection electrode plates, they are deflected according to the weight of the band. Another method using this method is called the microdot inkjet method. In this method, ink pressure and excitation conditions are maintained at appropriate values within a certain range, and two types of ink droplets, large and small, are ejected from the nozzle tip. Only the medium- and small-diameter ink droplets are used for recording. A feature of this method is that it is possible to obtain a group of microdroplets even with a nozzle diameter as large as that of conventional methods.

A third method is a piezo element method, in which a piezo element is used as a pressure means for applying pressure to the ink, rather than a mechanical means such as a pump as in other methods. This method applies an electric signal to a piezo element to cause mechanical displacement, thereby applying pressure to the ink and ejecting it from a nozzle.

In addition, there is an inkjet method in which ink subjected to the action of thermal energy undergoes a rapid volume change, and the acting force due to this state change is used to eject the ink from a nozzle. can also be used effectively.

(Effects) The recording material of the present invention as described above can be used for fountain pens, sign pens,
It is suitable not only for general writing instruments such as ballpoint pens that use water-based ink, but also as a recording material for inkjet recording that uses water-based ink, and has the following effects.

(1) Because the water-based ink is highly absorbent, it becomes the same state as if it were dried immediately after applying the ink, and even if parts of the recording device or fingers are attached, they may be contaminated or the recorded image may be smeared. There is no.

(2) When used for inkjet recording, the above (
In addition to the effect of 1), the dots are close to perfect circles and have a high density, and the dots do not bleed excessively or feather from the dots, making it possible to form clear and high-resolution images. Images with particularly excellent water resistance can be obtained.

(3) The base material itself has excellent ink absorption, dot shape, and water resistance, so even if the coating layer is relatively thin, the above (+) and (
2) is preferable, and generates less paper dust that may stain the inside of the recording device or cause nozzle clogging.

(4) Furthermore, since the amount of coating is small in the manufacturing process, migration of the binder is difficult to occur, and the load on the process is small, so it is possible to obtain a recording material at a relatively low cost.

(Example) Next, the present invention will be explained in more detail by giving examples and comparative examples. In the text, parts or percentages are based on weight unless otherwise specified.

LBKP1 of C, S, F380mIL as an example raw material valve
After adding the filler shown below as a filler, 0.005 part of a neutral sizing agent (A, Ni, D9, Dick Vercules 5Q) was added to make it 1 tsubo 70 g/r.
The paper was made so that the ash content according to J15-P-8128 was 9%.

Next, polyvinyl alcohol (PVA-11) with a concentration of 2% was added.
7. (manufactured by Kuraray) solution at a rate of 2 g/d was applied using a size press device to obtain a recording material of the present invention.

In the present invention, the following cationic fillers were used.

A: Synthetic silica (Thyroid 72, manufactured by Fuji Davison)
20 parts of a 2% aqueous solution of aluminum chloride is added to 100 parts of a 20% aqueous dispersion of aluminum chloride, thoroughly stirred, dried at 100°C for 1 hour, and further heat-treated at 500°C for 1 hour to obtain the cationic filler used in the present invention. : Manufactured by A.

B: Similarly, N-β(aminoethyl)γ-aminopropyltrimethoxysilane (
15 parts of a 2% aqueous solution (Shin-Etsu Silicone KBM-603, manufactured by Shin-Etsu Chemical Co., Ltd.) was added and dried at 110° C. for 20 minutes to prepare a cationic filler used in the present invention.

C: Calcium carbonate (Niscalon #2000, manufactured by Sankyo Seifun) was dispersed in ethanol to obtain a 20% dispersion. 8 parts of a 5% ethanol solution of a cationic resin (Nirekondo PQ-508, manufactured by Soken Chemical Co., Ltd.) was added to 100 parts of the dispersion described in Section 1, and after thorough stirring, the mixture was dried at 100°C for 15 minutes to obtain the cation used in the present invention. A filler was prepared.

D: Activated alumina (RK-30, manufactured by Iwatani Chemical Industry Co., Ltd.) was used.

E: Kachinic synthetic silicate (Mizuriki Night P-12,
(manufactured by Mizusawa Chemical) is used.

As fillers for comparison, untreated products (the following) of the above-mentioned cationic fillers used in the product A were used.

F: Synthetic silica (Thyroid 72, manufactured by Fuji Davison)
use.

G: Calcium carbonate (Niscalon #2000, manufactured by Sankyo Seifun) was used.

Examples 1 to 3 and Comparative Example 1 The above-mentioned fillers A to C and F were used as fillers, and recording materials for the present invention and for comparison were obtained according to the method described above.

Examples 4 to 5 and Comparative Example 2 Using paste 01, E and G as fillers, the ash content was 6%
Recording materials for the present invention and for comparison were obtained in the same manner as in Example 1, except that A was manufactured and paper-formed so that the following results were obtained.

Comparative example 3 Commercially available high-quality paper was used as a recording material for comparison.

Comparative Examples 4 and 5 Example 1 except that the ash content of the base paper was 0% and 25%.
A recording material for comparison was obtained in the same manner as described above.

The on-demand inkjet recording head (with an ejection orifice diameter Inkjet recording was performed using a recording device having a diameter of 60 μm, a piezo vibrator drive voltage of 70 V, and a frequency of 2.6 KHz, and the results are shown in Table 4.

2 parts diethylene glycol 20 parts polyethylene glycol 8200 10 parts water
68 parts Unused Yellow: (:, 1. Acid Yellow 86 Magenta: C, R, Acid Red 35 Cyan: C, 1, Direct Blue 86 Black: C, 1, Food Black 2 Examples and Comparative Examples The Steckigt size degree of the recording material and the evaluation results are shown in Table 1.

Each evaluation item in Table 1 was measured according to the following method.

(1) The ink fixation time was measured by measuring the time required for the ink to dry and stop adhering to the finger when touching the recorded image after recording.

(2) The dot density is determined by applying JIS-7505 to the printed microdot using the Sakura Microdensidometer P.
The black dots were measured using DM-5 (manufactured by Konishiroku Photo Industry ■).

(3) For the dot diameter, the diameters of 20 printed dots were measured using a stereomicroscope, and the average value was shown.

(4) The dot shape was evaluated on a five-point scale by observing the printed dots with a stereomicroscope, and rating the dots on a five-point scale, with a roughly round dot being ranked as a rank, and a dot with a broken circle and severe feathering being ranked as an E rank.

(5) Ink absorption was evaluated using a bubble jet printer having an inkjet recording head with 128 nozzles with a nozzle spacing of 16 mm for four colors of Y, M, C, and Bk. A recorded image in which the line size was worse than a monochrome part in a mixed-color part of two-color ink was given an X, and a case in which the line size was worse than a monochrome part was given an O.

(6) In the panel test, recorded images were created using the same printer as in (5) above, and 40 people (24 men, 16 women)
"Which one has better clarity and contrast?"
Ask the following questions and give 5 points to the best one and 1 point to the worst one.
Yes, the total was shown for a comprehensive evaluation.

(7) Powder removal occurs when paper dust adheres to the finger when touching the surface of the coating layer, or when the coating layer peels off or scrapes when the surface is scratched with a hardness H pencil. Those that do are marked as ×, and those that do not are marked as ○.

(8) Water resistance (1) is Bk of the printer used in (5)
Immerse the solid printed area in running water for 5 minutes, and after immersion 0, D (
The optical density) was measured using a Macbeth densitometer RD-918, and the O, D, and ratio (remaining 0.D) of the immersed surface were measured.

rate) was determined and evaluated.

γ7 1 ;-II 2 sentence five rules 3>3>3> 3
>3>f=Jin"21L degree 0.8 0.8 0.
8 0.8 0.8 Five-way diameter A difference unit 202 210
220 198 201 Dome” 21L shape AAAA
A ヱ ``Nishoku Possessed'' k sex 00 0 0 0 panel test 162 166 159 158 161 play-1'' L
--500000 Drunken Swimming-1% 99 97 100 100 9
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>3> Dome” 2 degrees 0.8 0.8 0.
6 0.8 0.8"1" m 205 22
2 197 24Q l'165-mu''21L shape
AAECA Eyu Kiga” Cutness ○ O× ○ O Panel Test +81 156 79 130 166 Powder-1”
し--50000×1ゝ', 1%79 76 71 63 9
9 Bean Dan Pa 1 rule: Shi 8 4 27 3
9 Note) 3>=3 seconds or less l) In Comparative Example 5, there was powder falling from the back side of the paper, and the paper was weak and lacked texture.

Examples 6 to 7 and Comparative Examples 6 to 8 The following coating liquid was applied onto the recording materials obtained in Example 1.4 and Comparative Examples 1 to 3 so that the dry coating amount was 3 g/ml. It was coated by a bar coater method and dried at 120° C. for 2 minutes to obtain recording materials for the present invention and for comparison.

2 Upper liquid dish Ebisu synthetic silica (Fine Seal
The recording materials obtained in 82-part real bb Examples 6 to 7 and Comparative Examples 6 to 8 were evaluated in the same manner using the same printer as in Example 1,
The results are shown in Table 2 below.

However, only the 5 part value of water resistance was determined according to the following method.

(9) Water resistance (2) was determined by soaking the solid printing area of the Y and M mixed color area of the printer used in (5) in running water for 5 minutes, and after soaking, the flow of the M dye was confirmed on the white area. Those that did were marked as ×, and those that did not were marked as O.

γ- 2, P- Engineering Z Kusada Gomochi 3>3>3> 3
> 10 seconds L 29 plates 1.2 1.2° 1.
2 +. 2 0.9Lヱ]”L
292 288 29: I 406 Σ-mu” double-layered AAAAB non-dip” 1nsha O ○ ○ ○ ×Panel test 185 183 182 185 9
6 animals - 0 00 0 0 Resistance -) L - resistance (2) O ○ xxx Small cane edge L
m對 9 10 10 6 30 Patent applicant Canon Co., Ltd.

Claims (6)

[Claims] (1) In a recording material in which a coating layer is provided on a base paper made of a fibrous substance and a filler, the filler is cationic and the base paper has an ash content of 2 according to JIS-P-8128.
15%, and a Steckigt size degree of the recording material is 1 to 15 seconds. (2) In a recording method in which recording is performed by attaching droplets of ink containing a water-soluble dye to a recording material, the recording material is
A recording method comprising the recording material according to claim 1. (3) The recording material and recording method according to Claims 1 and 2, wherein the coating layer contains a silicon-containing pigment and a hydrophilic resin, and has a thickness of 0.5 to 8 g/m^2. (4) The recording material and recording method according to claims 1 and 2, wherein the base paper has an ash content of 4 to 10%. (5) The recording material and recording method according to claims 1 and 2, wherein the base paper has a Steckigt size degree of 4 to 15 seconds. (6) The recording material and recording method according to claims 1 and 2, wherein the base paper is neutral paper.