JPH08246393A - Production of cast-coated paper for ink-jet recording, cast-coated paper and recording using the same - Google Patents

Abstract

PURPOSE: To obtain cast-coated paper having excellent surface gloss of white paper and ink-jet recording (printing) suitability. CONSTITUTION: Base paper is successively provided with an undercoated layer containing a pigment and an adhesive and a resin-containing coating film layer for casting. The coating film layer while being kept in a wet state is brought into contact with a heated specular drum under pressure, dried and finished to give the objective cast-coated paper for ink-jet recording. The cast-coated paper for ink-jet recording comprises the undercoated layer containing 0.1-2.5 pts.wt. of a nonionic surfactant having 9-14 HLB based on 100 pts.wt. of the pigment of the undercoated layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing cast coated paper having excellent white paper surface gloss and excellent ink jet recording (printing) suitability, cast coated paper and recording using the same. It is about the method.

[0002]

2. Description of the Related Art In recent years, recording by an ink jet printer is less noisy, high-speed recording is possible, and
It is used in various fields because it is easy to make multiple colors. As the ink jet recording paper, high-quality paper designed so as to have high ink absorbability, coated paper having a surface coated with a porous pigment, or the like is applied. By the way, all of these papers are mainly so-called matte ink jet recording papers having low surface gloss.

However, recently, with the expansion of applications such as high-speed ink jet recording, high definition of recorded images, and full-color ink jet recording, an ink jet recording paper having a high surface gloss and an excellent appearance has been desired. Generally, for paper with high surface gloss, apply a plate-like pigment on the surface,
Further, it is obtained by copying the mirror surface of the coated paper having a high gloss, which has been subjected to a calendering treatment, or a wet coating layer, by pressing and drying it on a heating drum surface having a mirror surface, if necessary. Cast coated paper and the like are known.

This cast coated paper has high surface gloss and more excellent surface smoothness as compared with a normal coated paper which has been subjected to a super calender finish, and an excellent printing effect can be obtained. However, when used as an ink jet recording sheet, it has various difficulties.

That is, in general, cast coated paper has a high gloss because a film-forming substance such as an adhesive in the pigment composition constituting the coated layer copies the specular drum surface of the cast coater. On the other hand, the presence of the film-forming substance causes a problem that the coating layer loses its porosity and the ink absorption during ink jet recording is extremely reduced. In order to improve the ink absorbability, it is important to make the cast coating layer porous so that the ink can be easily absorbed, and for that purpose, it is necessary to reduce the amount of the film-forming substance. . However, there is a drawback that the glossiness of white paper is reduced as a result by reducing the amount of the film-forming substance.

In conventional recording paper, for example, when performing full-color recording, for example, cyan ink and magenta ink are overprinted to express blue, but uneven penetration occurs in magenta of the first color, and cyan ink is used. There is a problem that a mottled printing surface with different color tone is obtained after recording (that is, ink absorption unevenness).

[0007]

The object of the present invention is to solve the above-mentioned problems and to have an excellent white paper surface gloss.
Another object of the present invention is to provide a method for producing cast coated paper having excellent ink jet recording (printing) suitability without unevenness in ink absorption, a cast coated paper and a recording method using the same.

[0008]

The present invention includes the following aspects. [1] While the base paper is provided with an undercoat layer containing a pigment and an adhesive, and the undercoat layer is coated with a coating liquid for casting containing a resin, the formed coating layer for casting is in a wet state, A method for producing a cast coated paper for ink jet recording, which is brought into pressure contact with a heated mirror surface drum and finished by drying,
The undercoat layer is HLB based on 100 parts by weight of the pigment.
A method for producing a cast coated paper for ink jet recording, which comprises 0.1 to 2.5 parts by weight of a nonionic surfactant of 9 to 14.

[2] The method for producing cast coated paper for ink jet recording according to [1], wherein the resin is obtained by polymerizing a monomer having an ethylenically unsaturated bond, and the glass transition point of the resin is 40 ° C. or higher. .

[3] A cast coated paper for ink jet recording, wherein a base paper is provided with an undercoat layer containing a pigment and an adhesive and a topcoat layer containing a resin in this order, and the topcoat layer is cast to finish. The undercoat layer is
A cast coated paper for ink-jet recording containing 0.1 to 2.5 parts by weight of a nonionic surfactant having an HLB of 9 to 14 based on 100 parts by weight of the pigment.

[4] The cast coated paper for inkjet recording according to [3], wherein the resin is obtained by polymerizing a monomer having an ethylenically unsaturated bond, and the glass transition point of the resin is 40 ° C. or higher.

[5] An ink jet recording method for forming an image on a cast coated paper for ink jet recording according to [3] by ejecting an aqueous ink from fine pores. [6] The ink jet recording method according to [5], wherein heat energy is applied to the water-based ink to eject the ink.

[7] The method for producing a cast coated paper for ink jet recording according to [1] or [2], wherein a cationic resin is added to the undercoat layer. [8] The cast coated paper for inkjet recording according to [3] or [4], wherein a cationic resin is added to the undercoat layer.

[0014]

[9] The cast coated paper for inkjet recording according to [3] or [4], wherein the pigment contained in the undercoat layer contains silica or alumina.

[0015]

According to the present invention, as described above, 0.1 to 2.5 parts by weight of the nonionic surfactant having an HLB of 9 to 14 is contained in the undercoat layer with respect to 100 parts by weight of the pigment of the undercoat layer. This configuration eliminates the unevenness of ink absorption in an inkjet recording (printing) image.
Although the reason for this is not clear, one point is that the surface tension of the undercoating material is reduced by the specific surfactant, and the leveling property of the undercoat layer is improved during smearing. There are two possible reasons why a uniform topcoat layer can be obtained by suppressing uneven penetration into the undercoat layer of the liquid. Furthermore, when a specific surfactant is used, the compatibility with other components in the undercoat coating liquid is improved, no agglomerates are generated in the coating liquid, and as a result, a highly glossy cast surface is obtained. .

The amount of the above-mentioned specific surfactant added is in the range of 0.1 to 2.5 parts by weight with respect to 100 parts by weight of the pigment in the undercoat layer. If the amount exceeds 2.5 parts by weight, micelles may be formed in the undercoat layer, and uneven absorption of ink may occur again.
That is, when the concentration of the surfactant is increased, intermolecular association occurs, micelles are formed, and particles having a hydrophobic group on the outside are formed.If this is partially localized, that part repels the ink and absorbs the ink. It causes unevenness.

The nonionic surfactant is not particularly limited, but for example, polyoxyethylene-polyoxypropylene condensate, primary alcohol ethoxylate, secondary alcohol ethoxylate, nonylphenol ethoxylate, Octylphenol ethoxylate, polyoxyethylene alkyl phenyl ether, oleyl alcohol ethoxylate, lauryl alcohol ethoxylate, phenol ethoxylate, polyoxyethylene glycol oleate, polyoxyalkylene tallowate, polyoxyethylene lauryl ether, sorbitan stearyl ester, sorbitan oleyl ester , Polyoxyethylene sorbitan oleyl ester, ethylene glycol distearate, fatty acid diethanol , Fatty acid mono ethanol amide,
Examples thereof include polyoxyethylene-fatty acid monoethanol amide.

Although not particularly limited, polyoxyethylene alkylphenyl ethers such as polyoxyethylene nonylphenyl ether and ethoxylates of primary or secondary alcohols are preferable.

The method for adjusting HLB is not particularly limited. For example, polyoxyethylene nonylphenyl ether C ₉ H
₁₉ - For _{C 6 H 4 -O- (C 2} H 4 O) n H, HLB by increasing the number of oxyethylene groups which are hydrophilic groups
The value can be adjusted greatly.

The pigment and adhesive contained in the undercoat layer will be described below. That is, as the pigment, for example, kaolin, clay, calcined clay, amorphous silica, zinc oxide, aluminum oxide, aluminum hydroxide, calcium carbonate, satin white, aluminum silicate, smectite, magnesium silicate, magnesium carbonate, magnesium oxide, diatomaceous earth, Styrene plastic pigment,
Various publicly known pigments in the general coated paper manufacturing field such as urea resin-based plastic pigments and benzoguanamine-based plastic pigments can be used.

Next, as an adhesive, proteins such as casein, soybean protein and synthetic protein, various starches such as starch and oxidized starch, polyvinyl alcohol, cellulose derivatives such as carboxymethyl cellulose and methyl cellulose, styrene-butadiene copolymerization Copolymers, conjugated methacrylate polymers such as methylmethacrylate-butadiene copolymer latex, acrylic polymer latex, vinyl polymer latex such as ethylene-vinyl acetate copolymer, etc. Generally used for coated paper Conventionally known adhesives may be used alone or in combination. The amount of the adhesive compounded is 5 to 50% by weight, more preferably 10 to 30% by weight, based on the pigment.
Adjusted in the range of.

Conventionally, it has been known to add a cationic resin to the coating layer of an inkjet paper for the purpose of improving the water resistance and the color density of printing. However, it is not preferable to add these cationic resins to conventional general cast coating liquids, because they lower the surface gloss and the ink absorbency. On the other hand, addition of a cationic resin to the coating liquid for the undercoat layer means that when a coating composition for casting containing a resin obtained by a polymerization reaction of an ethylenic monomer is applied as an overcoat, a cationic resin is added. Is to promote the aggregation of the coating composition for casting, to prevent excessive penetration into the undercoat layer, as a result, it is possible to obtain a uniform and high-gloss cast coating surface with less uneven gloss and pinholes, By the synergistic effect with the nonionic surfactant having an HLB of 9 to 14, a particularly uniform and highly glossy cast coated surface can be obtained, which is preferable.

Examples of the cationic resin in this case include polyalkylene polyamines such as polyethylene polyamine and polypropylene polyamine, or derivatives thereof, acrylic resins having a tertiary amino group or quaternary ammonium group, and diacrylamine. Etc. are used.

The amount of the cationic resin added is pigment 1
1 to 30 parts by weight, more preferably 5 to 100 parts by weight
It is adjusted in the range of up to 20 parts by weight. In addition, various auxiliaries such as a dispersant, a thickener, an antifoaming agent, a colorant, an antistatic agent and an antiseptic agent used in the production of general coated paper are appropriately added.

The composition for the undercoat layer composed of the above-mentioned materials is adjusted to have a solid content concentration of about 1 to 65% by weight, for example, and the base paper having a basis weight of about 20 to 400 g / m ² is used. Dry weight is ² to 50 g / m ² , more preferably 5 to
20 g / m ² about to become as blade coater, air knife coater, roll coater, brush coater,
It can be coated and dried by various coating devices such as a Champlex coater, a bar coater and a gravure coater. Further, if necessary, after the undercoat layer is dried, smoothing treatment such as super calendering, brushing and cast finishing can be performed.

The base paper to be the base is not particularly limited, and acid paper or neutral paper used for general coated paper is appropriately used.

An overcoat layer (coating layer for casting) is formed on the undercoating layer thus obtained. The resin used in the coating layer for casting has, for example, an ethylenically unsaturated bond. There is a resin obtained by a polymerization reaction of a monomer (hereinafter referred to as an ethylenic monomer). Specific examples include, for example, methyl acrylate, ethyl acrylate butyl acrylate, 2-ethylhexyl acrylate, lauryl acrylate, 2-hydroxyethyl acrylate, glycidyl acrylate, etc., alkyl group having 1 to 18 carbon atoms, methyl methacrylate, ethyl methacrylate. , 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, glycidyl methacrylate, and the like, methacrylic acid esters having 1 to 18 carbon atoms, styrene, α-methylstyrene, vinyltoluene, acrylonitrile, vinyl chloride, vinylidene chloride, acetic acid. Obtained by polymerizing ethylenic monomers such as vinyl, vinyl propionate, acrylamide, N-methylolacrylamide, ethylene and butadiene. That resin and the like. Usually, these resins are used in the form of emulsion.

The resin may be a copolymer in which two or more kinds of ethylenic monomers are used in combination, if necessary, and may be a substituted derivative of these polymers or copolymers. Incidentally, examples of the substituted derivative include a carboxyl group derivative and an alkali derivative thereof. Further, the above-mentioned ethylenic monomer is polymerized in the presence of colloidal silica to obtain Si-O.
It can also be used in the form of a complex by a -R (R: polymer component) bond. In addition, a pigment such as colloidal silica may be used as a resin (polymer) as long as the recording suitability is not impaired.
About 200 parts by weight or less may be added to 100 parts by weight.

In the conventional cast coated paper, a resin having a relatively low glass transition point is used in order to obtain an excellent surface gloss, and when the cast finishing is performed, the resin component in the coating liquid is sufficiently formed into a film. It had a high gloss. However, such a method is not preferable because the porosity of the surface of the cast coated paper is reduced, and as a result, the ink absorption during inkjet recording may be reduced. However, when a resin having a high glass transition point is used, cast finishing can be performed in a state where the resin is not completely formed into a film, so that the decrease in the porosity of the surface of the cast coated paper is slight and the absorption of the ink does not decrease, Moreover, a cast coated surface having an excellent glossy surface can be obtained, which is preferable.

Therefore, in the present invention, among the above resins, those having a glass transition point of 40 ° C. or higher are preferable, and more preferably 50 to 100 ° C. That is, when the glass transition point of the polymer is low, the heat of the surface of the cast drum facilitates the film formation of the resin component more than necessary, the porosity of the surface of the cast coated paper is reduced, and the gloss value of the surface is Although it is high, the ink absorbency may decrease.

In the production of the cast coated paper of the present invention, the cast coated layer is dried and finished under the temperature condition (cast drum surface temperature) below the glass transition point of the resin contained in the cast coating liquid. Good results are obtained.

In order to adjust the whiteness, viscosity, fluidity, etc. in the cast coating layer, pigments, dispersants and thickeners used in general printing coated papers and ink jet papers. , Various anti-foaming agents, coloring agents, antistatic agents, preservatives and the like are appropriately added.

On the coated surface of the above-mentioned undercoat coated paper, the coating composition for casting is coated with various known compositions such as a blade coater, an air knife coater, a roll coater, a brush coater, a chanplex coater, a bar coater and a gravure coater. Coating with a coating device, while the coating layer is in a wet state as described above, pressure contact with a heated mirror drum,
It will be dried and cast finished. In this case, the coating amount of the coating composition for casting (coating liquid) is 0.2 to 30 g / m ² in terms of dry solid content, preferably 1 to 10 g / m ² .
m ² .

The ink jet recording method of the present invention using the thus obtained cast coated paper for ink jet recording may be a system capable of effectively separating the ink from the nozzle to apply the ink to the recording medium as a range. Any method may be used, but in particular, in the method described in JP-A-54-59936, the ink subjected to the action of thermal energy undergoes a rapid volume change, and the action force due to this state change causes An inkjet recording method in which ink is ejected from nozzles can be effectively used.

An example of an inkjet recording apparatus suitable for the inkjet recording method of the present invention will be described below. An example of the head structure, which is the main part of the apparatus, is shown in FIGS. 1, 2 and 3. That is, the head 13 is made of glass, ceramic, plastic plate, or the like having a groove 14 through which ink passes, and a heating head 15 (a head is shown in the drawing, but not limited to this) used for thermal recording. It is obtained by bonding. The heating head 15 includes a protective film 16 made of silicon oxide or the like and aluminum electrodes 17-1 and 17.
-2, a heating resistor layer 18 made of nichrome or the like, a heat storage layer 19, and a substrate 20 having a good heat dissipation property such as alumina.

The ink 21 is a discharge orifice (fine hole) 2
2, the meniscus 23 is formed by the pressure P.

Now, when an electric signal is applied to the electrodes 17-1 and 17-2, the area indicated by n of the heating head 15 rapidly heats up, and air bubbles are generated in the ink 21 in contact therewith, and the pressure thereof is generated. At this point, the meniscus 23 is projected, the ink 21 is ejected, becomes a recording droplet 24 from the orifice 22, and flies toward the recording sheet 25. FIG. 3 shows an external view of a multi-head in which many heads shown in FIG. 1 are arranged. The multi-head includes a glass plate 27 having multi-grooves 26, and FIG.
The heating head 28 similar to that described in FIG.

FIG. 1 shows the head 1 along the ink flow path.
3 is a sectional view of FIG. 3, and FIG. 2 is a sectional view taken along the line AB of FIG. 1.

FIG. 4 shows an example of an ink jet recording apparatus incorporating such a head. In FIG. 4, 61
Is a blade serving as a wiping member, one end of which is held by a blade holding member to be a fixed end, which is in the form of a cantilever. The blade 61 is arranged at a position adjacent to the recording area by the recording head, and in the case of this example, is held in a form protruding in the movement path of the recording head. Reference numeral 62 denotes a cap, which is disposed at a home position adjacent to the blade 61, and has a configuration in which it moves in a direction perpendicular to the moving direction of the recording head and contacts the ejection port surface to perform capping. Further, 63 is an ink absorber provided adjacent to the blade 61, and is held in a form projecting in the movement path of the recording head like the blade 61. The blade 61, the cap 62, and the absorber 63 form an ejection recovery unit 64, and the blade 61 and the absorber 63 remove water, dust, and the like from the ink ejection port surface.

Reference numeral 65 denotes a recording head having ejection energy generating means, which ejects ink onto a recording medium facing the ejection port surface on which ejection ports are arranged for recording, and 66 denotes a recording head 65 on which the recording head 65 is mounted. It is a carriage for moving the. The carriage 66 slidably engages with a guide shaft 67, and a part of the carriage 66 is connected (not shown) to a belt 69 driven by a motor 68. Accordingly, the carriage 66 can move along the guide shaft 67, and the recording area by the recording head 65 and the area adjacent thereto can be moved.

Reference numeral 51 designates a paper feeding section for inserting a recording medium, and 5
A paper feed roller 2 is driven by a motor (not shown). With these configurations, the recording medium is fed to a position facing the ejection opening surface of the recording head, and is ejected via the ejection roller 53 as the recording progresses.

In the above structure, when the recording head 65 returns to the home position after the recording is completed, the head recovery unit 6
The fourth cap 62 is retracted from the movement path of the recording head 65, but the blade 61 is projected in the movement path. As a result, the ejection port surface of the recording head 65 is wiped. When the cap 62 comes into contact with the protruding surface of the recording head 65 to perform capping, the cap 62 moves so as to protrude 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 at the same positions as the above wiping positions. As a result, the protruding opening surface of the recording head 65 is wiped even during the movement.

The above-mentioned movement of the recording head to the home position is performed not only at the end of recording or 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. After moving to the position, the wiping is performed in accordance with the movement.

On the other hand, in the ink used in the ink jet recording method of the present invention, a dye for forming an image and a liquid medium for dissolving or dispersing the dye are essential components,
If necessary, various dispersants, surfactants, viscosity modifiers,
It is prepared by adding a specific resistance adjusting agent, a pH adjusting agent, an antifungal agent, a dissolution (or dispersion) stabilizer of a recording agent, and the like.

The recording agents used in the ink include direct dyes, acid dyes, basic dyes, reactive dyes, food dyes, disperse dyes, oil dyes and various pigments, but conventionally known ones are not particularly limited. Can be used without. The content of such a dye is determined depending on the type of liquid medium component, the properties required for the ink, etc., but in the case of the ink of the present invention, the formulation as in the conventional ink, that is, There is no particular problem when used in a proportion of about 0.1 to 20% by weight.

The ink used in the present invention is a liquid solvent prepared by dissolving or dispersing the above-described dye, and water or water and a water-soluble organic solvent may be a polyhydric alcohol having an effect of preventing the ink from drying. What is contained is used.

[0048]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.
Further, parts and% in the examples represent solid parts by weight and solid% by weight, respectively, unless otherwise specified.

Example 1 100 parts of alumina as a pigment, 20 parts of polyvinyl alcohol as an adhesive, and polyethylene polyamine resin as a cationic resin (trade name: Neofix RP-70
/ Nippa Kagaku Kogyo Co., Ltd.) 8 parts, 0.3 parts of polyoxyethylene nonyl phenyl ether as a nonionic surfactant having an HLB of 9, and sodium phosphate of 0.1% as a dispersant.
5 parts was added to prepare an undercoat coating liquid having a solid content concentration of 15%. This undercoating coating liquid was applied to a base paper having a basis weight of 100 g / m ² by an air knife coater so as to have a dry weight of 10 g / m ² , and dried to obtain a base paper having an undercoat layer.

On the other hand, as a cast coating liquid, 40 parts of a styrene-2 methylhexyl acrylate copolymer having a glass transition temperature of 80 ° C., 60 parts of colloidal silica, and 2 parts of calcium stearate as a release agent have a solid content concentration of 30.
% Coating solution for casting was prepared. This coating liquid was applied onto the base paper provided with the undercoat layer by using a roll coater, immediately followed by pressure contact with a mirror surface drum having a surface temperature of 75 ° C., drying and release, and cast coating for inkjet recording. I got the paper. The coating amount at this time is 5 g in terms of solid content weight.
/ M ² .

Example 2 A cast coated paper for ink jet recording was obtained in the same manner as in Example 1 except that the HLB of the nonionic surfactant added to the undercoat paint was changed to 12.

Example 3 A cast coated paper for ink jet recording was obtained in the same manner as in Example 1 except that the HLB of the nonionic surfactant added to the undercoat paint was changed to 14.

Example 4 An ink jet recording cast was carried out in the same manner as in Example 1 except that the number of nonionic surfactants added to the undercoat paint was changed from 0.3 to 1.5 parts. A coated paper was obtained.

Example 5 An ink jet recording cast was conducted in the same manner as in Example 1 except that the number of nonionic surfactants added to the undercoat paint was changed from 0.3 to 2.4 parts. A coated paper was obtained.

Example 6 In Example 1, the nonionic surfactant added to the undercoat paint was polyoxyethylene lauryl ether (HL).
A cast coated paper for inkjet recording was obtained in the same manner as in Example 1 except that B = 9) was changed.

Example 7 100 parts of a styrene-methyl acrylate copolymer having a glass transition point of 50 ° C. as a cast coating liquid and 5 parts of ammonium oleate as a releasing agent, the solid content concentration was 35.
% Coating solution for casting was prepared. This coating liquid was applied onto the base paper having the undercoat layer obtained in Example 1 using a roll coater, and immediately thereafter, it was pressed against a mirror-finished drum having a surface temperature of 60 ° C., dried, and then released from the mold. A cast coated paper for recording was obtained. The coating amount at this time was 5 g / m ² in terms of solid content weight.

Example 8 70 parts of magnesium carbonate as a pigment for the undercoating liquid,
30 parts heavy calcium carbonate, 5 oxidized starch as an adhesive
Parts, 10 parts of styrene-butadiene copolymer latex,
Dicyandiamide resin as cation resin (trade name:
Neofix FY / Nippa Kagaku Kogyo Co., Ltd. 5 parts, H
0.3 parts of polyoxyethylene nonylphenyl ether as a nonionic surfactant having an LB of 12 and 0.4 parts of sodium polyphosphate as a dispersant were added to prepare an undercoating coating liquid having a solid content concentration of 30%. . This undercoat coating liquid was coated on a base paper having a basis weight of 60 g / m ² with a blade coater so as to have a dry weight of 15 g / m ² , and dried to obtain a base paper provided with an undercoat layer.

Then, the undercoat base paper was coated with the casting coating solution used in Example 1 to obtain a cast coated paper for ink jet recording in the same manner as in Example 1.

Comparative Example 1 A cast coated paper for ink jet recording was prepared in the same manner as in Example 1 except that the nonionic surfactant HLB of 7.5 added to the undercoat paint was used. Obtained.

Comparative Example 2 Example 1 is the same as Example 1 except that the nonionic surfactant HLB of 15 added to the undercoat paint is used.
A cast coated paper for inkjet recording was obtained in the same manner as in.

Comparative Example 3 A cast coated paper for ink jet recording was obtained in the same manner as in Example 1 except that the number of parts of the nonionic surfactant added to the undercoat paint was changed to 0 part.

Comparative Example 4 A cast coated paper for ink jet recording was obtained in the same manner as in Example 1 except that the number of parts of the nonionic surfactant added to the undercoat paint was 3.0 parts. .

Comparative Example 5 InkJet in the same manner as in Example 1 except that the nonionic surfactant added to the undercoat paint was changed to 0.5 part of alkylbenzene sulfonate as an anionic surfactant. A cast coated paper for recording was obtained.

Comparative Example 6 InkJet in the same manner as in Example 1 except that the nonionic surfactant added to the undercoat paint was changed to 0.5 part of a cationic surfactant, alkylamine oxide. A cast coated paper for recording was obtained.

Table 1 shows the results of white gloss, ink jet recording suitability, and operability of the cast coated paper thus obtained. The above evaluation was carried out by the following method.

[Glossiness of white paper] It was measured according to JIS-P8142.

[Inkjet Recording Suitability] (Absorbability of Inkjet Recording Ink) Printing was performed with a color printer BJC-600J (inkjet recording apparatus) manufactured by Canon Inc., and the drying property of the ink was visually evaluated. ◯: Slightly soiled when touched with a finger immediately after printing, but almost dry. Δ: The ink portion is slightly shiny immediately after printing, but there is no problem in practical use. X: Due to poor drying of the ink, the ink flows during printing and cannot be used practically.

(Coloring property of ink jet recording ink after recording) Color printer BJC-manufactured by Canon Inc.
Printing was performed at 600 J, and the ink density was visually evaluated. ◯: Color density is good. Δ: The color density is slightly low, but there is no practical problem. X: The color density is too low to be practical.

(Ink absorption unevenness after ink-jet recording ink recording) Printing was performed with a color printer BJC-600J manufactured by Canon Inc., and the ink unevenness was visually evaluated. ◯: Good with no uneven absorption. Δ: Absorption unevenness is slightly observed when observed carefully. X: Absorption unevenness is clearly recognized.

[Cast operability] ◯: Operation was possible without problems. △: Low speed but at a level at which operation is possible. ×: Drum pick occurs due to poor releasability and operation is impossible.

[0071]

[Table 1]

[0072]

As is clear from the results shown in Table 1, the cast coated paper of the present invention was excellent in surface gloss and suitability for ink jet recording and could be efficiently produced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a head portion of an inkjet recording apparatus.

FIG. 2 is a cross-sectional view of a head portion of an inkjet recording device.

3 is an external perspective view of a head in which the head shown in FIG.

FIG. 4 is a perspective view showing an example of an inkjet recording apparatus.

[Explanation of symbols]

 13: Head 14: Groove through which ink is passed 15: Heating head 16: Protective film 17-1: Aluminum electrode 17-2: Aluminum electrode 18: Heating resistor layer 19: Heat storage layer 20: Substrate 21: Ink 22: Orifice 23: Meniscus 24: Recording droplets 25: Recording sheet 26: Multi-groove 27: Glass plate 28: Heating head 51: Paper feeding section 52: Paper feeding roller 53: Paper discharging roller 61: Blade 62: Cap 63: Ink absorber 64: Discharge recovery unit 65: Recording head 66: Carriage 67: Guide shaft 68: Motor 69: Belt

Claims (6)

[Claims] 1. A base paper is provided with an undercoating layer containing a pigment and an adhesive, and the undercoating layer is coated with a coating solution for casting containing a resin while the coating layer for casting is formed in a wet state. A method for producing a cast coated paper for ink jet recording, which comprises press-contacting a heated mirror surface drum and drying to finish, wherein the undercoat layer has a HLB of 9 to 14 with respect to 100 parts by weight of the pigment. 0.1 to 0.1
A method for producing a cast coated paper for inkjet recording, containing 2.5 parts by weight. 2. A resin obtained by polymerizing a monomer having an ethylenically unsaturated bond, and having a glass transition point of 4
The method for producing a cast coated paper for inkjet recording according to claim 1, which is 0 ° C. or higher. 3. A cast coated paper for ink jet recording, wherein a base paper is provided with an undercoat layer containing a pigment and an adhesive and a topcoat layer containing a resin in this order, and the topcoat layer is cast finished. A cast coated paper for inkjet recording, wherein the layer contains 0.1 to 2.5 parts by weight of a nonionic surfactant having an HLB of 9 to 14 based on 100 parts by weight of the pigment. 4. A resin obtained by polymerizing a monomer having an ethylenically unsaturated bond, and having a glass transition point of 40.
The cast coated paper for ink jet recording according to claim 3, which has a temperature of not less than ° C. 5. An ink jet recording method for forming an image on a cast coated paper for ink jet recording according to claim 3 by ejecting a water-based ink from fine pores. 6. The ink jet recording method according to claim 5, wherein thermal energy is applied to the water-based ink to eject the ink.