JPH08295076A - Recording paper and ink jet recording method using the paper - Google Patents

Abstract

PURPOSE: To obtain recording paper excellent in fixation and drying of water ink and preventing an occurrence of feathering by incorporating particulate cellulose of a specific amount per unit area in paper made of mainly a fibrous pulp. CONSTITUTION: Recording paper is manufactured by incorporating particulate cellulose in paper at a rate of 0.1 to 10g per square meter of the paper. In such a case, it is preferable that the particulate cellulose is contained at least on the surface or near the surface of the paper. A cationic substance can be used on the paper in combination with the particulate cellulose. Combined use of these substances increases the effectiveness in preventing feathering and improves coloring. fibrous pulp to be used may be one usually used for paper making, for example, chemical pulp, mechanical pulp or recycled paper pulp which is represented by LBKP and NBKP.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plain paper type recording paper for ink jet recording and an ink jet recording method using this recording paper.

[0002]

2. Description of the Related Art Inkjet recording systems have attracted attention because they can easily achieve high-speed recording, colorization, and high density recording, and recording apparatuses that employ the inkjet recording system have also become widespread.

As a recording paper applied to such an ink jet recording system, for example, a coated paper type paper dedicated to ink jet recording as disclosed in JP-A-59-35977 and JP-A-1-135682 is used. Has been.

Further, with the application of inkjet recording to various fields, more advanced characteristics are required for inkjet recording paper (recording material). For example, (1) the ink is abundantly absorbed, and the ink is quickly dried and fixed. (2) When the ink dots are adjacent to each other, the adjacent ink dots flow out into the mutual ink dots and are mixed nonuniformly. , So-called bleeding does not occur, (3) recording agents such as dyes agglomerate on recording paper to form beads and cause uneven density, so-called beading does not occur, (4) adhered to recording paper Ink droplets do not diffuse and the diameter of ink dots does not become excessively large. (5) Image density of ink dots is high, and blurring does not occur around characters and images. (6) Ink recording material (coloring). That the color development of the components is excellent,
Properties such as (7) good color reproducibility and high-definition images can be obtained, and (8) excellent water resistance are required.

For the purpose of providing a recording paper or recording sheet satisfying such characteristics, for example, a recording sheet having a porous ink absorbing layer on a substrate or a water-soluble or hydrophilic substrate on a transparent substrate. A recording sheet provided with an ink receiving layer made of a polymer has been provided, and, for example, JP-A-60-220750 discloses a water-soluble polyvinyl alcohol having a saponification degree of 70 to 90 mol% on a polyester film. There is disclosed a recording sheet provided with a hydrophilic coating.

On the other hand, in the fields of monochrome recording and business color recording, there are various recording apparatuses according to different recording methods, which are more available and available at a low price in offices, etc. rather than using dedicated paper corresponding to each recording method. There is a demand for recording paper that is versatile for various recording systems.

From this point of view, when looking at the ink jet recording paper, a coated paper type ink jet recording paper can form a high-definition and clear image in ink jet recording, but it is used as a plain paper. When attempting to do so, for example, (1) the texture and handleability of plain paper may be poor, (2) the writability when writing with a pencil may be poor, and (3) the powder used for the coat layer may be missing. There are problems such as (4) low versatility to other recording methods, and (5) higher cost than plain paper.

A plain paper type recording paper most widely used in offices at present is, for example, Japanese Patent Application Laid-Open No. 51-13244.
JP-A-59-162561, JP-A-59-162561
The toner transfer paper (PPC paper) for electrophotographic copying machines and the like disclosed in Japanese Patent Application Laid-Open No. -191068, etc., but none of the PPC papers having sufficient inkjet recording suitability has been found yet.

For example, when the PPC paper which is now popular is used for ink jet recording, the following problems often occur. (1) The water-based ink has poor absorbency, and when a large amount of ink is applied, the drying and fixing of the ink is slow (the ink is not fixed, and when the recording surface is in contact with an object, it is formed. May damage the image). (2) When water-based ink is absorbed into the paper layer, bleeding occurs along the fibers that make up the paper, so the ink dots become too large, and the outer peripheral shape of the ink dots is irregular such as jagged. So-called feathering, which is a shape or blurring, occurs, and clear characters and recorded images cannot be obtained. (3) In color image recording, when ink dots of different colors are printed adjacent to each other, undesired color mixture, so-called bleeding, occurs due to the outflow of ink between these ink dots, resulting in sharpness and coloration of the image. In many cases, a satisfactory image cannot be obtained due to deterioration of the image quality. For example, when bleeding occurs at the boundary between solid printing portions of different colors, the sharpness of the boundary is impaired, the color is blurred, and uneven color mixture is observed. (4) Since it does not have a special structure for fixing a water-soluble recording agent such as a dye used in the water-based ink, the water resistance of the recorded image is insufficient. (5) The coloring property of the recording agent (colorant) such as dye used in the ink is insufficient.

Therefore, means for dealing with these problems,
For example, as means for enhancing the water resistance of a recorded image, Japanese Patent Laid-Open No. Sho 5
6-99693 discloses an inkjet recording paper containing a halogenated quaternary ammonium salt or the like. However, although this recording paper is improved in water resistance, it has a problem that the light resistance of the recording material is significantly reduced.

Further, as means for improving both water resistance and light resistance, JP-A-61-58788 discloses a recording paper containing a polyallylamine salt without providing a special coating layer. There is. However, this recording paper still has a problem that the image density is low and bleeding easily occurs.

[0012]

The object of the present invention is, for example, (1) excellent fixing and drying properties of water-based ink, (2) generation of feathering can be suppressed to a level where there is no practical problem, (3) The occurrence of bleeding in color printing can be suppressed to the extent that there is no practical problem, (4) excellent color development, (5) excellent water resistance of recorded images, (6) texture and handling as plain paper, Satisfy the characteristics such as
An object is to provide a recording paper suitable for inkjet recording. Another object of the present invention is to provide an inkjet recording method using this recording paper.

[0013]

The recording paper of the present invention which achieves the above object comprises a base paper mainly composed of fibrous pulp and 0.1 to 1 per 1 square meter surface of finely divided cellulose.
It is characterized in that it was contained in the range of 0 g. Preferably, the particulate cellulose is contained at least on the surface of the recording paper or in the vicinity of the surface. By distributing the particulate cellulose at least on the surface of the recording paper or in the vicinity of the surface, the absorbability of the aqueous ink and the ink drying property (fixing property) are further improved. Further, the inclusion of the finely divided cellulose suppresses the occurrence of bleeding and makes it possible to obtain a recorded image having good water resistance.

In this recording paper, a cationic substance can be used in combination with the particulate cellulose. By using these substances in combination, a higher effect of preventing feathering can be obtained, and the coloring property is further improved. Further, by using an ink containing an anionic dye as a recording agent component, the characteristics of the recording paper of the present invention can be more effectively exhibited.

The fibrous pulp that can be used to form the recording paper of the present invention can be used without particular limitation as long as it is one that is used in ordinary paper manufacturing. For example, LBK
Examples thereof include chemical pulp represented by P, NBKP, etc., mechanical pulp and recycled pulp of waste paper, or a mixture of one or more of these.

The fine particle cellulose used for forming the recording paper of the present invention has, for example, an average particle diameter of 10 μm.
Hereinafter, fine particles having a particle size of preferably 5.0 μm or less can be used. The lower limit of the average particle diameter of the particulate cellulose is
The thickness is preferably about 0.1 μm, and if it is finer than this, the ink absorbency is lowered. As a method for obtaining such finely divided cellulose, for example, a method in which crystalline cellulose obtained by drying plant fibers is further pulverized to be processed into fine particles or fine crystalline particles can be used.

In the recording paper of the present invention, examples of the cationic substance optionally used in combination with the particulate cellulose include a cationic metal salt, a cationic inorganic polymer compound and a cationic organic compound. You can
One of these may be used alone, or two or more of these may be used in combination.

Examples of the cationic metal salt include polyvalent metal salts such as aluminum chloride, barium chloride, nickel chloride, magnesium chloride and aluminum hydroxide. Examples of the cationic inorganic polymer include smectite, polyaluminum chloride, polyaluminum hydroxide and the like.

Examples of the cationic organic compound include:
Examples thereof include organic amine salts, organic polymer amine salts, cationic organic polymer compounds and organic oligomers, and cationic organic metal compounds.

Specific examples of the organic amine salt include hydrochlorides such as laurylamine, coconut amine, stearylamine and rosinamine, and primary, secondary or tertiary amine salt type compounds such as acetate; lauryltrimethylammonium. Chloride, lauryl dimethyl benzyl ammonium chloride, benzyl tributyl ammonium chloride,
Quaternary ammonium salt type compounds such as benzalkonium chloride; pyridinyl salt type compounds such as cetylpyridinium chloride and cetylpyridinium bromide; imidazoline type cationic compounds such as 2-heptadecenyl-hydroxyethylimidazoline; dihydroxyethylstearylamine and the like Examples thereof include ethylene oxide adducts of higher alkylamines.

Specific examples of the organic polymer amine salt include hydrochlorides such as polyallylamine, polyvinylamine and polyamine sulfone, acetates, hydrobromides and the like.

Specific examples of the cationic organic polymer compound and organic oligomer include, for example, homopolymers or copolymers having alcohol amine ester such as acrylic acid or methacrylic acid or alcohol ammonium salt type ester as a constituent monomer. Can be mentioned.

Specific examples of the cationic organometallic compound include:
Examples thereof include ferrocenylene compounds such as bisferrocenylene, polyferrocenylene, and polyvinylferrocenylene having a mixed valence, and phosphonium compounds such as tetramethylphosphonium iodide.

The recording paper of the present invention can be obtained by incorporating fine particle cellulose into a paper obtained by making a paper using a raw material mainly composed of fibrous pulp. Papermaking can be carried out according to a conventional method, for example, a method in which fibrous pulp, sizing agent (inner surface sizing agent, surface sizing agent, etc.) and filler are mainly used, and other papermaking auxiliaries are used as necessary. Available.

Examples of the inner surface sizing agent include rosin size, alkyl ketene dimer, alkenyl succinic anhydride, petroleum resin type size, epichlorohydrin and acrylamide. Examples of the surface sizing agent include casein, starch, cellulose derivatives such as carboxymethyl cellulose, hydroxymethyl cellulose, polyvinyl alcohol, polyvinylpyrrolidone, sodium polyacrylate, hydrophilic resins that swell due to absorption of aqueous ink such as polyacrylamide, SBR latex, and acrylic. Examples thereof include emulsions, resins having hydrophilic and hydrophobic moieties in the molecule such as styrene / acrylic acid copolymers, silicone oils, paraffins, waxes, fluorine compounds, water-repellent substances and the inner surface sizing agents.

As the filler, for example, calcium carbonate,
Examples include kaolin, talc, titanium dioxide and the like.

The recording paper of the present invention is, for example, as follows. A method of impregnating a paper produced from a raw material containing fibrous pulp with a liquid containing fine particle cellulose, B. A method of applying a liquid containing fine particle cellulose to the surface of paper made from a raw material containing fibrous pulp, C. When making paper, it can be obtained by a method such as mixing the raw material (pulp slurry) with finely divided cellulose to make paper. These methods can also be used when a cationic substance is used in combination.

The upper limit of the content of the finely divided cellulose is about 10 g, preferably 5.0
It is about g. The lower limit is about 0.1 g, and preferably about 0.5 g per square meter of paper. The content of the particulate cellulose is the above lower limit (0.
If it is less than 1 g / m ² ), the occurrence of bleeding becomes remarkable and the water resistance becomes poor. The upper limit (10
When it exceeds g / m ² ), the ink absorbency is deteriorated, the occurrence of bleeding becomes more remarkable, and the light resistance may be impaired.

When a cationic substance is used in combination, the upper limit of the amount is, for example, 10 g / m 2 per 1 m 2 of paper.
^{It is set to} about ² , preferably about 5.0 g / m ² , and the lower limit thereof is, for example, 0.1 g / m ² per square meter of paper.
And preferably about 0.5 g / m ² .

When the finely divided cellulose and the cationic substance are used in combination, the content of each of them is 0.5 to.
By setting the amount within the range of 5.0 g / m ² , a higher effect of preventing feathering and color development can be obtained, and the image density is further improved.

The water-extracted pH value of the recording paper of the present invention can be appropriately selected according to its storability and the like. For example, when the recording paper is required to have a long-term storability, it is preferably 6 or more, more preferably. It is desirable to adjust to 7 or more. Further, if the water extraction pH is less than 6, there may be a problem that sufficient color developability cannot be obtained depending on the kind of the recording agent component used in the ink. The upper limit of the water extraction pH is preferably adjusted to 10 or less, more preferably 9 or less. When the water extraction pH exceeds this upper limit (pH 10), there may be a problem that sufficient color development of the recording agent cannot be obtained. The water extraction pH is J
Test fragment 1.0 of the standard specified in IS-P-8133
g is a value obtained by measuring the pH of the extract when immersed in 70 ml of distilled water according to JIS-Z-8802.

The Steckigt sizing degree of the recording paper of the present invention is not particularly limited and may be appropriately selected within the range that good ink fixability and dryness can be obtained depending on the material used, but for example, preferably 0. Within the range of -40 seconds. Further, the upper limit of the basis weight of the recording paper of the present invention is preferably about 150 g / m ^{2 in} consideration of transportability, for example. The lower limit is, for example, 50 g / m ² . Basis weight is 50 g / m ²
If it is less than the above range, strike-through and cockling may occur.

The recording paper of the present invention is as good as the conventional neutral PPC paper in terms of texture and handleability (surface shape, physical characteristics, etc.) as plain paper. Furthermore, by using an anionic dye as a recording agent component for recording with a water-based ink, it is possible to more effectively suppress the occurrence of bleeding and obtain a recorded image with better water resistance. Becomes Moreover, the writing property with a pencil or the like is excellent, and even when the fine particle cellulose is contained, the powder drop is reduced to such an extent that there is no practical problem.

Image formation by the ink jet recording method on the recording paper of the present invention having the above constitution can be carried out, for example, as follows.

As the ink used for image formation, any ink applicable to the ink jet method can be used without limitation. For example, a recording agent for forming an image and a liquid medium for dissolving or dispersing the recording agent are essential components,
If necessary, various dispersants, surfactants, viscosity modifiers,
Specific examples include compositions having a specific resistance adjusting agent, a pH adjusting agent, a preservative (antifungal agent), an antioxidant, an evaporation accelerator, a stabilizer for dissolving or dispersing a recording agent, and the like. The selection of the surfactant when it is used is particularly important for adjusting the permeability of the ink into the recording paper.

Recording agents used in inks include direct dyes, acid dyes, basic dyes, reactive dyes, food dyes,
Examples thereof include disperse dyes, oil dyes, various pigments, and the like, and conventionally known ones can be used without limitation. As mentioned above, as the recording agent, a water-soluble dye having an anionic group is particularly preferable. Examples of the water-soluble dye having an anionic group include color index (COLO).
Water-soluble acid dyes, direct dyes, and reactive dyes described in UR INDEX) having an anionic group can be used. Even those not listed in the color index can be used without particular limitation as long as they have an anionic group such as a sulfone group or a carboxyl group. It should be noted that the water-soluble dyes referred to herein include those having pH dependence in solubility.

The content of the recording agent in the ink is determined depending on the characteristics required of the ink and the like, but is about 0.1-20.
A general concentration of about wt% can be used.

The liquid medium component of the ink is, for example,
Water or a mixture of water and a water-soluble organic solvent is preferably used. Specific examples of the water-soluble organic solvent include, for example,
Amides such as dimethylformamide and dimethylacetamide; ketones such as acetone; 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
-Alkylene glycols such as hexanetriol, thiodiglycol, hexylene glycol, diethylene glycol; lower alkyl ethers of polyhydric alcohols such as ethylene glycol methyl ether, diethylene glycol monomethyl ether, triethylene glycol monomethyl ether; ethanol, isopropyl alcohol, n -Monohydric alcohols such as butyl alcohol and isobutyl alcohol; glycerin; N-methyl-2-pyrrolidone; 1,3-dimethyl-2-imidazolidinone;
Triethanolamine; sulfolane; dimethylsulfoxide and the like can be mentioned, and one or more of them can be used.
The content of the water-soluble organic solvent in the ink is not particularly limited, but is preferably 1 to 50% by weight, more preferably 2 to 30% by weight.

Suitable physical properties of the ink include, for example,
PH around 3-12 and surface tension around 10-60 at around 25 ° C.
dyn / cm, more preferably 10-40 dyn / c
m, and the viscosity is 1 to 30 cps.

As an ink jet recording method which can be used for ink jet recording on the recording paper of the present invention, small droplets of an aqueous ink (recording liquid) are ejected from an ink flow path (nozzle) using various driving principles. Any of the inkjet recording methods for performing recording can be applied. As a typical example, in the method described in Japanese Patent Laid-Open No. 54-59936, the ink subjected to the action of thermal energy undergoes a rapid volume change in the ink flow path, and the ink due to the action force due to this state change There is a method of ejecting the ink from the ejection port at the tip of the ink flow path.

An example of an ink jet recording apparatus that can be used in the ink jet recording method of the present invention will be described below with reference to the drawings. 1, 2 and 3 show an example of the configuration of a recording head which is a main part of the apparatus. FIG. 1 is a sectional view taken along the ink flow path of the recording head, and FIG. 2 is A- of FIG.
It is sectional drawing in a B line. The recording head 13 has a structure obtained by adhering a plate made of glass, ceramic, plastic or the like having a groove 14 serving as an ink flow path, and a heating head 15 (the structure of the heating head is not limited to that shown in the drawing). Have. The heat generating head 15 includes a heat storage layer 19, a heat generating resistance layer 18 made of nichrome, etc., an electrode 1 made of aluminum, etc. on a substrate 20 having a good heat dissipation property such as alumina.
7-1 and 17-2 and a protective layer are laminated in this order, and by energizing the electrodes 17-1 and 17-2, the portion of the heating resistor layer 18 where the electrode is not laminated (n is n) The portion within the indicated area) generates heat, and thermal energy acts on the ink located above it.

At the time of recording, the ink 21 is filled up to the ejection port (orifice) 22 which is a fine opening at the end of the groove 14, and in that state, the electrodes 17-1 and 1 are corresponding to the recording signal.
When electricity is applied to 7-2, the area indicated by n of the heat generating head 15 rapidly generates heat, and bubbles are generated in the ink 21 in contact therewith, and the pressure causes the ink 21 to drop from the ejection port 22 into small droplets 24. Are ejected and fly toward the recording medium 25.

FIG. 3 shows the appearance of a multi-head in which a large number of ink channels shown in FIG. 1 are arranged. This multi-head has a grooved plate 27 having multi-grooves 26 composed of a large number of grooves constituting ink flow paths arranged in parallel, and a heat generating region having the same structure as in FIG. 1 at a predetermined position in each groove ( n) is adhered to the heating head 28 formed so as to be arranged.

FIG. 4 shows an example of an ink jet recording apparatus incorporating the multi-head shown in FIG. In FIG. 4, reference numeral 61 denotes a plate serving as a wiping member, one end of which is held by a blade holding member to become a fixed end, which is in the form of a cantilever. The blade 61 is arranged at a position adjacent to the recording area with respect to the recording head, and in the case of this example, is held in a form protruding in the moving path of the recording head. 62 is a cap,
It is arranged at the home position adjacent to the blade 61,
The recording head is moved in a direction perpendicular to the moving direction to come into contact with the ejection port surface to perform capping. 63 more
Is an ink absorber provided adjacent to the blade 61, and like the blade 61, is held in a protruding form in the movement path of the recording head. The blade 61, the cap 62, and the ink absorber 63 constitute an ejection recovery unit 64, and the blade 61 and the ink absorber 63 remove water, dust, and the like from the ink ejection port surface.

Reference numeral 65 denotes a recording head for recording by the ink jet recording system, which has a structure for ejecting ink by thermal energy as shown in FIGS. 6
Reference numeral 6 denotes a carriage for mounting the recording head 65 and moving the recording head 65. The carriage 66 slidably engages with the guide shaft 67, and a part of the carriage 66 is connected (not shown) to a belt 69 driven by a motor 68. As a result, the carriage 66 moves the guide shaft 6
7, it is possible to move to the recording area by the recording head 65 and its adjacent area.

Reference numeral 51 is a paper feed section for inserting a recording medium, and 52 is a paper feed roller driven by a motor (not shown). With these configurations, the recording medium is supplied to the position facing the ejection port surface of the recording head, and is discharged via the discharge roller 53 as the recording progresses.

In the above structure, when the recording head 65 returns to the home position at the end of recording or the like, the head recovery unit 6
The cap 65 of No. 4 is retracted from the moving path of the recording head, but the blade 61 is projected in the moving path. As a result, the ejection port surface of the recording head 65 is wiped. Further, when the cap 62 comes into contact with the ejection port surface of the recording head 65 to perform capping, the cap 62 moves so as to project into the movement path of the recording head.

When the recording head 65 moves from the home position to the recording start position, the cap 62 and the blade 61 are in the same position as the above-mentioned position during wiping. As a result, the ejection opening surface of the recording head 65 is wiped even during this movement.

The above-mentioned movement of the recording head to the home position is performed not only at the end of recording and at the time of ejection recovery, but also at the home adjacent to the recording area at a predetermined interval while the recording head moves in the recording area for recording. The wiper is moved to the position, and the wiping is performed along with the move.

In the case of color recording, a recording head in which cyan, magenta, yellow, and black ejection ports are arranged in parallel in one head, or a cyan recording head, a magenta recording head, and a yellow recording head are used. And black recording heads can be used in parallel. In this case, each color may be ejected from one ejection port, or two or more droplets of the same color may be simultaneously adhered to the recording medium by ejecting simultaneously from a plurality of ejection ports for each color. Good.

[0051]

The present invention will be described in more detail with reference to the following examples. Example 1 90 parts by weight of LBKP as raw pulp, NBKP10
After mixing and beating, 10 parts by weight of kaolin (manufactured by Tsuchiya Kaolin) and 0.2 parts by weight of alkenyl succinic anhydride are used, and the basis weight is 70 g / m ² and the Steckigt sizing degree is 23 by a conventional method. Second base paper (P-1) was produced.

On one side of this raw paper, a slurry of fine particle cellulose (trade name: Ceorus Cream, manufactured by Asahi Kasei, microcrystalline cellulose, 10% slurry, average particle diameter 3.5 μm)
Recording solutions 1 to 7 were obtained by applying a coating solution prepared by mixing a cationic substance as required to the above so that the dry coating amounts would be the amounts shown in Table 1, and then drying. Each of the obtained recording papers had a texture and handleability as plain paper, and had good writing performance with a pencil. Further, when the cross section of the obtained recording paper was observed with an electron microscope, it was confirmed that the microcrystalline cellulose existed at least on the surface or in the vicinity of the surface.

[0053]

[Table 1] 1) Content per square meter of base paper 2) Benzyltributylammonium chloride, trade name: BTBAC, Sanyo Kasei 3) Benzalkonium chloride, trade name: G-50, Sanyo Kasei 4) Polyacrylamine hydrochloride , Trade name: PAA · HCl-3L, molecular weight: 10000, Nitto Boseki Co., Ltd. Each liquid mixed with the following components has a pore size of 0.
Yellow (Y), magenta (M), cyan (C), and black (B) inks were prepared by pressure filtration with a 2 μm membrane filter (trade name: Fluoropore filter, manufactured by Sumitomo Electric).

[0054]

[Table 2] 1 m using the above recording papers 1 to 6 and ink (4 types)
A color image is formed (printed) on a recording paper by a recording apparatus equipped with an ink jet type recording head which has 14 nozzles per m and ejects ink droplets by the action of heat. Was evaluated. The evaluation results obtained on each recording paper are shown in Table 3.
Shown in 1. Color developability A color image sample was printed using four color inks of yellow, magenta, cyan and black, and the degree of color developability was evaluated by sensory evaluation by classifying into three levels. The case where the color developability is good for all colors is A, the case where it is superior to the B step is A, and the case where it is inferior to the B step and practically problematic is C. 2. Character quality Alphanumeric characters were printed using black ink and evaluated visually. Those with little or no noticeable feathering were marked with ⊚, those with a little noticeable feathering but with no practical problems were marked with ◯, and those with a lower level were practically problematic. 3. Bleeding The solid portions of the inks of yellow, magenta, cyan, and black were printed adjacent to each other, and the degree of occurrence of bleeding and uneven color mixture (bleeding) at the boundary of each color was visually observed and evaluated. No bleeding or almost no bleeding ◎, bleeding is seen but it is small enough to not cause any practical problems ○, below it is practically problematic ×
And 4. Water resistance Print solid images and alphanumeric characters of inks of yellow, magenta, cyan and black, and leave for 1 hour.
The image sample was immersed in tap water having a water temperature of 20 ° C. for 10 seconds. Then, it was taken out from water, a filter paper was lightly pressed to remove moisture from the surface of the recorded image surface, air-dried as it was, and the water resistance was visually evaluated. In any of the solid images of the four color inks, there is no dye bleeding into the margins, almost no dye is seen, there is almost no background stain, and bleeding occurs in any of the alphanumeric characters of the four color inks. There is no or almost no ◎, the dye flowed out to the margin part in one of the solid images, and there was some blurring in one of the alphanumeric characters, which is a practical problem. The case where there was no color was marked with ∘, and the case where there was a problem in practical use due to the fact that the dye flowed out into the blank area in any of the solid images, the stain on the background was remarkable, and the bleeding of alphanumeric characters was also severe.

Comparative Example 1 Using the base paper (P-1) produced in Example 1 as a recording paper as it was, ink jet recording was carried out in the same manner as in Example 1 and the recording characteristics were evaluated. Table 3 shows the obtained results.
Shown in

Comparative Example 2 A recording paper (R-1) was obtained by coating one side of the base paper produced in Example 1 with the ceolus cream so that the dry coating amount was 0.01 g / m ² , and drying. It was Inkjet recording was performed on the obtained recording paper in the same manner as in Example 1, and the recording characteristics were evaluated. Table 3 shows the obtained results.

[0057]

[Table 3]

[0058]

According to the present invention, for example, ink absorption,
It has excellent ink-jet recording characteristics such as excellent drying (fixing), suppressed bleeding, and enables formation of recorded images with good water resistance, and has a texture and handleability as plain paper. Therefore, it is possible to provide a recording paper having high versatility.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view taken along an ink flow path of a head portion of an inkjet recording apparatus that can be used in the method of the present invention.

2 is a cross-sectional view of the head portion shown in FIG. 1 taken along the line AB.

FIG. 3 is a perspective view showing the outer appearance of a multi-head in which a plurality of ink channels are arranged in parallel.

FIG. 4 is a perspective view showing an outline of an inkjet recording apparatus that can be used in the method of the present invention.

[Explanation of symbols]

 13 recording head 14 groove 15 heating head 16 protective film 17-1 and 17-2 electrode 18 heating resistor 19 heat storage layer 20 substrate 21 ink 22 ejection port 24 recording droplet 25 recording medium 26 multi-groove 27 glass plate 28 heating head 51 Paper feed unit 52 Paper feed roller 53 Paper discharge roller 61 Wiping member 62 Cap 63 Ink absorber 64 Ejection recovery unit 65 Recording head 66 Carriage 67 Guide shaft 68 Motor 69 Belt

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor ▲ Takahashi Katsuhiko 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (11)

[Claims] 1. A base paper mainly made of fibrous pulp and 0.1 to 1 per 1 square meter of fine particle cellulose on the surface of the paper.
A recording paper characterized by being contained in an amount of 0 g. 2. The recording paper according to claim 1, wherein the fine particle cellulose is contained on the surface or in the vicinity of the surface. 3. The method according to claim 1, further comprising a cationic substance.
Or the recording paper according to 2. 4. The recording paper according to claim 3, wherein the cationic substance is a cationic organic compound. 5. The recording paper according to claim 4, wherein the organic compound is a polymer or an oligomer. 6. The recording paper according to claim 3, wherein the cationic substance is a cationic metal salt. 7. 0.5 g to 5 per square meter of paper
The fine particle cellulose is contained in a range of g.
The recording paper according to any one of 6. 8. 0.1 g to 1 per 1 square meter of paper
The said cationic substance is contained in the range of 0 g.
The recording paper according to any one of 7. 9. An ink jet recording method, characterized in that an ink is ejected from an ejection port of a recording head according to a recording signal and adhered to the recording paper according to claim 1 to form an image. 10. The ink jet recording method according to claim 9, wherein the ink is ejected by applying thermal energy to the ink. 11. The ink jet recording method according to claim 9, wherein the ink contains an anionic recording agent.