High gloss printed paper for ink jet recording, its making method and ink jet recording method using the paper

High gloss printing paper for ink jet recording, its manufacturing method and ink jet recording method using the paper

The present invention relates to high-gloss printing paper for ink jet recording, in particular to a high-gloss printing paper with excellent white paper surface gloss and excellent ink jet recording (printing) adaptability, its manufacturing method and ink jet using this paper Record method.

In recent years, recording with inkjet printers has been used in many ways because of its low noise, high-speed recording possible, and easy multicolorization.

As ink jet recording paper, it is suitable for high-quality paper that is rich in ink absorbency, and coated paper with porous pigment coated on the surface. However, these papers are all papers with low surface gloss, and so-called matt-based ink jet recording paper is still the main body.

However, with the recent increase in so-called ink jet recording and high speed, the use of high-definition and full-color recorded images has expanded, and ink jet recording paper with high surface gloss and excellent appearance has been required.

Generally speaking, as paper with high surface gloss, it is known that: coating flake pigments on the surface, and then applying calender-treated high-gloss coated paper as needed, or laminating wet coating on the surface. The so-called high gloss printing paper obtained by drying and imitating the mirror surface on the heated roll surface with a mirror surface.

This kind of high gloss printing paper has high surface gloss and excellent surface smoothness compared with ordinary coated craft paper after highly calendering processing, and has achieved excellent printing effect, but still has various shortcomings.

That is to say, the general high gloss printing paper, for example, as disclosed in US5275846, imitates the mirror surface of the high gloss applicator through film-forming substances such as the binder in the pigment composition constituting the coating layer. High gloss is obtained on the surface of the reel. On the other hand, there are problems such as the loss of the porosity of the coating layer due to the presence of the film-forming substance, which greatly reduces the absorption of ink during ink jet recording. Therefore, in order to improve its ink absorbency, it is important that the high-gloss coating layer can easily absorb ink and impart its porosity. For this reason, it is necessary to reduce the amount of film-forming substances. On the other hand, due to the reduction in the amount of film-forming substances, the gloss of the white paper is reduced.

As described above, the current situation is that it is extremely difficult to satisfy both the surface gloss of high-gloss printing paper and ink jet recording (printing) adaptability.

In light of the foregoing, the inventors of the present invention have repeatedly conducted intensive studies to obtain high-gloss printing paper that maintains the original high surface smoothness and high gloss of high-gloss printing paper and has excellent adaptability for ink jet recording (printing). As a result, it was found that by coating a high gloss coating liquid containing a polymer component with a specific glass transition point on the base paper provided with an undercoating layer, and then performing high gloss processing, excellent ink jet printing can be displayed. Adaptability, and maintain the original strong gloss of high-gloss printing paper, and obtain high-gloss printing paper with excellent ink jet printing adaptability that cannot be obtained with conventional high-gloss printing paper.

The present invention includes the following embodiments, but is not limited thereto.

The present invention includes: coating a coating solution containing a polymer on a base paper provided with a primer coating layer containing a pigment and a binder to form a coating layer for high gloss. It is formed by polymerizing a monomer with a sexually unsaturated bond and has a glass transition point above 40°C. While the high-gloss coating layer is in a wet state, it is crimped on a heated mirror roll and dried to obtain Finished high-gloss printing paper for ink jet recording, the high-gloss printing paper has an air permeability of 300 seconds/100CC or less, and contains a cationic resin in the above-mentioned primer coating layer. The cationic resin is made of polyalkylene The cationic resin formed by copolymerization of polyamines and dicyandiamide, the high gloss coating layer contains silica, and the primer coating layer contains alumina or silica. Glossy printing paper includes drying the surface temperature of the mirror roll at a temperature lower than the glass transition point of the polymer.

The present invention also includes providing a primer coating layer containing a pigment and a binder on the base paper, and coating the primer coating layer with a coating solution containing a polymer to form a high gloss coating layer , The polymer is polymerized by monomers with ethylenic unsaturated bonds and has a glass transition point above 40°C. When the high-gloss coating layer is in a wet state, it is crimped on the heated mirror roll , Drying to obtain a finishing method of high gloss printing paper for ink jet recording, wherein the surface temperature of the mirror roll is dried under the condition of lower than the glass transition temperature of the polymer.

The present invention also includes that the base paper is provided with a primer coating layer containing a pigment and a binder, and a surface coating layer containing a polymer is provided on the base paper to form a strong gloss paper for ink jet recording. It is formed by polymerization of monomers combined with sexually unsaturated monomers and has a glass transition point above 40°C. It faces the above-mentioned strong glossy paper for ink jet recording. The water-based ink is ejected from fine holes to form an image. This is a characteristic ink jet recording. The method involves applying thermal energy to the water-based ink to eject the ink, the air permeability of the coated paper on the surface of the glossy paper is 300 seconds/100CC or less, and the primer coating layer of the glossy paper contains a cationic resin. It is a cationic resin obtained by copolymerizing polyalkylene polyamines and dicyandiamide. The surface coating layer of the glossy paper contains silica, and the primer coating layer of the glossy paper contains alumina or dioxide. silicon.

As described above, according to one embodiment of the present invention, by applying a coating solution containing a specific resin on a base paper provided with a primer coating layer containing a pigment and a binder, the high gloss processing is performed, and both retention is obtained. The coated paper for ink jet recording has excellent surface gloss desired by the present invention and excellent ink jet printing adaptability.

Here, as the high-gloss coating liquid, a coating composition containing a polymer is used which polymerizes a monomer having an ethylenically unsaturated bond and has a glass transition point of 40°C or higher.

That is, in the present invention, the polymer contained in the coating composition for high gloss (high gloss coating liquid) and polymerized from monomers having ethylenically unsaturated bonds is, for example, the following Polymers obtained by polymerization of vinyl monomers: methyl acrylate, ethyl acrylate, butyl acrylate, 2-hexyl ethyl acrylate, dodecyl acrylate, 2-hydroxyethyl acrylate, glycidyl acrylate and other alkyl groups Acrylic esters with 1-18 carbon atoms, methyl methacrylate, ethyl methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, glycidyl methacrylate, etc. Methacrylates with 1-18 carbon atoms, styrene, α-methylstyrene, vinyl toluene, acrylonitrile, vinyl chloride, vinylidene chloride, vinyl acetate, vinyl propionate, acrylamide , N-methylol acrylamide, ethylene, butadiene, etc. In particular, styrene-acrylate copolymers and styrene-methacrylate copolymers are preferred.

In addition, the polymer may be a polymer in which two or more ethylenic monomers are used in combination as necessary, or may be a substituted derivative of these polymers or copolymers. Therefore, as the substituted polymer, for example, a carboxylated or alkali-reactive polymer can be mentioned. In addition, the above-mentioned ethylenic monomer may be polymerized in the presence of colloidal silica, and then combined by Si-OR (R: polymer component) to form a composite, and used in the form of such a composite.

As already stated, it is necessary that the glass transition point of the polymer formed by polymerizing the above-mentioned ethylenic monomer is above 40°C, preferably in the range of about 50-100°C, and most preferably in the range of about 50-100°C. In the range of about 70-90°C.

The glass transition point can be adjusted by, for example, the kind of ethylenic monomer or the degree of crosslinking of the polymer. For example, the glass transition point can be increased by containing a monomer such as styrene that relatively increases the glass transition point by 50% by weight or more.

In the coating composition for high gloss, in addition to the above-mentioned polymer, a pigment such as colloidal silica may be blended, and the amount is usually in the range of 0 to 200 parts by weight relative to 100 parts by weight of the polymer.

In the conventional high-gloss printing paper, in order to obtain excellent surface gloss, the resin component in the coating liquid is completely formed into a film during the high-gloss processing to obtain high gloss. However, the use of such a method reduces the porosity of the surface of the high-gloss printing paper, and as a result, the absorption of ink during ink jet recording is reduced, which is unsatisfactory.

In the present invention, in order not to reduce the ink absorption, since a polymer with a high glass transition point is used, high gloss processing is performed without completely forming a film of the polymer composition. Therefore, the reduction of the surface porosity of the high-gloss printing paper is slight, the ink absorption is not reduced, and a high-gloss coated surface with an excellent gloss surface can be obtained.

When the glass transition point of the polymer is less than 40°C, the heat on the surface of the high-gloss roll is used to easily form a film of more than necessary resin components, which reduces the porosity of the surface of the high-gloss printing paper, and as a result, the ink absorbency decreases. .

The present invention uses only the polymer having a specific glass transition point as described above to prepare a composition for a high-gloss coating layer. In order to improve the release properties as required, a release agent, casein, soy protein, etc. can be used together. And for the purpose of improving ink adhesion and water resistance after ink jet printing, cationic resins containing tertiary amino groups and quaternary ammonium groups are used at the same time. In addition, in order to adjust whiteness, viscosity, fluidity, etc., pigments, dispersants, thickeners, defoamers, colorants, and anti-charging used in general coated paper for printing and ink jet paper are appropriately added. Additives, preservatives, etc.

In addition, in the method of the present invention, it is necessary to coat the above-mentioned specific polymer composition on a primer coating layer previously provided on the base paper. When the base paper is directly coated and then subjected to high gloss processing, the smoothness of the base paper surface is significantly worse than the surface smoothness when the primer is applied, resulting in surface defects such as so-called pores.

In another embodiment of the present invention, by adjusting the air permeability measured according to the JIS-P-8117 standard of high-gloss printing paper to 300 seconds/300 cc or less, excellent ink absorption is obtained.

When the air permeability measured according to the JIS-P-8117 standard exceeds the above range, the surface gloss value is high, which reduces the ink absorbency.

The lower limit of the air permeability is not particularly limited, and it is generally preferably 5 seconds/100CC or more, and more preferably in the range of 10 to 200 seconds/100CC.

After the high-gloss coating layer is formed, as a means to obtain a high-gloss printing paper with an air permeability of 300 seconds/100CC in accordance with the above-mentioned JIS-P-8117, there can be mentioned by applying a primer coating layer to the substrate. The coated surface of the paper is measured with a Gulai high-pressure air permeability tester, and the measured value (using ASTM-D-726 method) is adjusted to 30 seconds/10CC or less (the paper has low air permeability). 20 seconds/10CC or less. This is because the ink absorbency of the ink jet tends to decrease when it exceeds 30 seconds/10CC, and the high gloss operation performance also decreases.

The pigment and binder contained in the primer coating layer will now be described. That is, as the pigment, for example, pottery clay, clay, calcined clay, amorphous silica, zinc oxide, alumina, aluminum hydroxide, calcium carbonate, white pigment, aluminum silicate, montmorillonite, and magnesium silicate can be used. , Magnesium carbonate, magnesium oxide, diatomaceous earth, styrene plastic pigments, urea resin plastic pigments, benzoguanamine plastic pigments, etc., as well as various pigments commonly known in the general coated paper manufacturing field.

In addition, among the above-mentioned pigments, particularly when porous pigments such as amorphous silica and alumina are used, the ink absorbency and the color development density of printing during ink jet recording can be particularly improved. The reason is that amorphous silica and alumina have a very porous structure, causing a large number of voids in the coating layer. As a result, the air permeability is also reduced and the ink absorbency is improved.

In addition, since the pigment has high transparency and does not hinder the color development of the ink dye absorbed in the coating layer, the final printing color development is improved.

In addition, it is desirable that the additive amount of amorphous silica as a pigment is at least 50% by weight or more.

Furthermore, as the binder, proteins such as casein, soy protein, and synthetic protein, various starches such as starch and oxidized starch, and cellulose derivatives such as polyvinyl alcohol, carboxymethyl cellulose, or methyl cellulose are used. , Styrene-butadiene copolymer, conjugated diene polymer latex of methyl methacrylate-butadiene copolymer, propylene-based polymer latex, ethylene-vinyl acetate copolymer and other vinyl-based polymerization Conventionally known binders used in general coated paper such as latex, etc., can be used alone or in combination. In addition, the blending amount of the binder is adjusted in the range of 5-50% by weight, preferably 10-30% by weight, relative to the pigment.

In another embodiment of the present invention, when high-gloss printing paper is manufactured, the temperature condition is lower than the glass transition point of the polymer that is the main component of the high-gloss coating liquid (coating liquid for overcoat layer). The high-gloss coating layer was dried and processed, and satisfactory results were obtained.

In addition, the lower limit of the temperature of the mirror reel is not particularly limited, but it is preferably 40°C or higher, and more preferably in the range of 50-90°C.

Coating a high-gloss coating composition containing a polymer with the above-mentioned specific glass transition point on a coated paper with a primer layer, and then press-bonding it on a high-gloss roll, when performing high-gloss processing In particular, it is ideal to dry at a temperature of the roll surface lower than the glass transition point of the polymer.

As described above, by performing high gloss processing in a state where the polymer composition does not form a complete film, a high gloss coating layer with strong gloss can be obtained while maintaining the porosity of the surface of the high gloss coating layer.

On the contrary, by increasing the drying temperature of the high-gloss coating layer, these polymer compositions form a film above the glass transition point. As a result, the polymer film hinders the surface porosity of the high-gloss coating layer, making the ink jet recording ink Absorption dropped significantly. Therefore, when the glass transition point of the polymer composition is lower than 40°C, the high-gloss processing is performed at the surface temperature below it. As a result, the drying speed of the high-gloss coating composition will be significantly slowed down, which inevitably causes Productivity decreases.

However, the solid content of the primer coating layer composition is generally adjusted to the level of 1 to 65% by weight. On the base paper with a basis weight of about 20-400 g/m2, a blade coater or an air knife coater is used. , Rubber rollers, brush coaters, coaters, bar coaters, gravure coaters and other publicly known and public coating devices, with a dry weight of 2-50g/m2, preferably 5 -20g/m2 for coating and then drying. In addition, if necessary, after the primer coating layer is dried, smoothing treatments such as super calendering, brushing, and high-gloss processing can be carried out.

In addition, the base paper constituting the substrate is not particularly limited, and acid paper or neutral paper generally used for coated paper is applicable.

In addition, in order to match the printing quality, the degree of glue and filler can be adjusted appropriately.

On the coated surface of the primer coated paper obtained in this way, apply the high-gloss coating liquid composed of the above-mentioned specific polymer composition using a blade coater, an air knife coater, a rubber roller, and a brush. Coating by various well-known coating devices, such as machine, coater, bar coater, gravure coater, etc., as described above, while the coating layer is in a wet state, it is crimped on the heated mirror roll On the cylinder, dry again, that is, high-gloss processing. In this case, the coating amount of the high-gloss coating liquid is 0.2-30 g/m2, preferably 1-10 g/m2, based on the dry solid portion.

In order to adjust the whiteness, viscosity, fluidity, etc. of the high-gloss coating liquid, pigments, dispersants, thickeners, defoamers, colorants, and preventive agents used in general printing coated paper or ink jet paper can be appropriately added. Various additives such as charging agent and preservative.

In addition, with regard to conventional ink jet paper, it is known to add a cationic resin to the coating layer for the purpose of improving water resistance and printing color development density. However, the addition of these cationic resins to conventional high-gloss coating liquids is undesirable due to the reduction in surface gloss and ink absorbency. On the other hand, adding a cationic resin to the coating liquid for the bottom coating layer does not reduce the surface gloss and ink absorbency, and the water resistance and the printing color density can also be improved. In addition, when a cationic resin is added to the coating liquid for the primer layer, when the high-gloss coating composition containing the polymer composition as the main component is applied as the final coat, the cationic The resin promotes the aggregation of the coating composition for high gloss, thereby preventing excessive penetration into the primer layer. As a result, uneven gloss and pinholes are reduced, and a uniform high gloss coating surface with high gloss can be obtained.

In addition, as the cationic resin in this case, for example, polyalkylene polyamines such as polyethylene polyamine or polypropylene polyamine or derivatives thereof, acrylic resins containing tertiary amino groups or quaternary ammonium groups, dipropylene amine, and the like are used.

In addition, the addition amount of the cationic resin is adjusted within the range of 1-30 parts by weight, preferably 5-20 parts by weight, relative to 100 parts by weight of the pigment. In addition, various auxiliary agents such as dispersants, thickeners, defoamers, colorants, antistatic agents, and antiseptics used in general coated paper production are appropriately added.

According to another embodiment of the present invention, as the cationic resin, a cationic resin produced by copolymerizing polyalkylene polyamines and dicyandiamide is included in the undercoat layer to maintain the original high gloss printing paper High gloss, high smoothness, and high gloss printing paper with excellent ink jet printing and recording adaptability and water resistance that cannot be obtained with high gloss printing paper.

That is, according to this embodiment, it is a high gloss printing paper for ink jet recording, which is characterized in that the base paper contains pigments and binders, and contains polyalkylene polyamines and dicyandiamide. A primer coating layer of a cationic resin formed by polymerization, and on the primer layer is a high gloss coating of a polymer with a glass transition point above 40°C formed by polymerizing monomers containing ethylenic unsaturated bonds Fabric layer, the above two layers are superimposed.

In addition, as a cationic resin formed by copolymerization of polyalkylene polyamines and dicyandiamide, for example, direct resins derived from diethylenetriamine, triethylenetetramine, tetraethylenepentamine, or iminobispropylamine can be mentioned. Chain polyamine and/or its hydrochloride, sulfate, acetate and other linear polyamine and/or its hydrochloride, sulfate, acetate and other salts and dicyandiamide copolymer Cationic resin. Compared with conventional cationic resins, such as acrylic resins with tertiary amino groups and tertiary or quaternary ammonium groups, dipropylene amine and other cationic resins used in conventional ink jet recording papers, this resin has better water resistance after high gloss processing. Excellent, and get higher gloss.

The ink jet recording method of the present invention using the high-gloss printing paper for ink jet recording obtained in this way can be any method that can effectively release the ink from the nozzle and deliver the ink to the recording medium as the range body, especially It uses the method described in Japanese Patent Laid-Open No. 54-59936: The ink subjected to thermal energy undergoes a drastic volume change, and due to the force generated by the change in its state, the ink jet recording method in which the ink is ejected from the nozzle can be Use effectively.

An example of an ink jet recording apparatus applicable to the ink jet recording method of the present invention will be described below. Fig. 1, Fig. 2 and Fig. 3 show an example of the configuration of the recording head which is the main part of the apparatus. That is, the recording head 13 can connect a glass, ceramic, or plastic plate having an ink channel 14 to a heating head 15 for thermal recording (the heating head is shown in the figure, but is not limited to this). The heating head 15 is composed of a protective film 16 made of silicon oxide or the like, aluminum electrodes 17-1 and 17-2, a heating resistor layer 18 made of nickel or the like, a heat storage layer 19, and a substrate 20 having good heat dissipation properties such as aluminum oxide.

The ink 21 reaches the ejection orifice (fine hole) 22, and the meniscus 23 is formed by the pressure P.

At this time, when an electrical signal is applied to the electrodes 17-1 and 17-2, the area indicated by n in the heating head 15 generates heat rapidly, and bubbles are generated in the ink 21 close to the area, and the pressure of the ink makes the meniscus 23 protrudes, the ink 21 is ejected, and a recording droplet 24 is formed from the orifice plate 22 and flies toward the recording sheet 25. Fig. 3 is an external view of a multi-recording head in which several heads shown in Fig. 1 are arranged side by side. The multi-recording head is made by close-fitting a glass plate 27 with multiple channels and the same heating head 28 as described in FIG. 1.

In addition, FIG. 1 is a cross-sectional view of the recording head 13 along the ink flow path, and FIG. 2 is a cut view along the line AB of FIG. 1.

An example of incorporating such a recording head into an ink jet recording apparatus is shown in FIG. 4. In FIG. 4, 61 is a plate as a friction contact member, one end of which is held by the holding member of the plate to become a fixed end, thereby forming a cantilever form. The plate 61 is arranged at a position adjacent to the recording area by the recording head. And in the case of this example, the protruding form is maintained in the distance traveled by the recording head. 62 is a cover, which is arranged at a static position adjacent to the plate 61. It moves in a direction perpendicular to the moving direction of the recording head and faces the ejection port. It has a structure to block the cover. In addition, 63 is an ink absorber provided adjacent to the plate 61, which maintains a protruding form in the movement path of the recording head like the plate 61. The plate 61, the cover 62, and the absorber 63 constitute the discharge recovery portion 64, and the plate 61 and the absorber 63 remove moisture, dust, etc. on the ink ejection port surface.

65 is a recording head that has a means for generating ejection energy and ejects ink on a recording medium facing the ejection port with ejection ports for recording. 66 is a recording head 65 that is equipped with a recording head 65 to move the recording head 65. Sliding frame. The carriage 66 and the guide shaft 67 are slidably coupled, and a part of the carriage 66 is connected to a belt 69 driven by a motor 68 (not shown). Therefore, the carriage 66 can move along the guide shaft 67, enabling the movement of the area recorded by the recording head 65 and the area adjacent thereto.

51 is a paper feeding portion for inserting a recording medium, and 52 is a paper feed roller driven by a motor not shown. With such a structure, paper is fed to the recording medium at a position facing the ejection port of the recording head, and the paper is discharged by the paper discharge drum 53 as the recording progresses.

In the above structure, when the recording head 65 returns to the rest position at the end of recording, although the cover 62 of the recording head recovery portion 64 is retracted from the moving path of the recording head 65, the plate 61 is protruded in the moving path. As a result, the ejection port surface of the recording head 65 is brought into frictional contact. In addition, in the case where the cap 62 is in contact with the protruding surface of the recording head 65 to close the cap, the cap 62 moves so as to protrude in the movement path of the recording head.

When the recording head 65 moves from the rest position to the recording start position, the cover 62 and the plate 61 are in the same positions as the positions when they are in frictional contact as described above. As a result, the protruding orifice surface of the recording head 65 is also in frictional contact during its movement.

The above-mentioned movement of the recording head to the stationary position is temporarily not performed at the end of recording and at the time of ejection recovery. While the recording head is moving in the recording area for recording, it moves to a stationary position adjacent to the recording area at predetermined intervals, and performs the aforementioned frictional contact with the movement.

On the other hand, as the ink used in the ink jet recording method of the present invention, the pigment forming the image and the liquid medium for dissolving or dispersing the pigment are essential components, and various dispersants, surfactants, and viscosity are added as needed. Adjusting agent, specific resistance adjusting agent, pH adjusting agent, antifungal agent, recording agent dissolution (or dispersion) stabilizer, etc. are prepared.

The recording agent used in the ink includes direct dyes, acid dyes, basic dyes, reactive dyes, food dyes, disperse dyes, oil dyes, and various pigments, but conventionally known dyes are not particularly limited. To use. The content of such a pigment depends on the type of the liquid medium component, the characteristics required for the ink, etc., but in the case of the ink used in the present invention, it is also mixed as in the existing ink, that is, 0.1-20% ( There is no particular problem when using the ratio of weight).

As the ink used in the present invention, a liquid solvent in which the above-mentioned pigment is dissolved or dispersed, and as water or water and a water-soluble organic solvent, a polyvalent alcohol having an effect of preventing ink drying is used.

Examples The following examples illustrate the present invention more specifically, but are not limited thereto. In addition, as in the examples, the parts and% are not specifically defined in advance, and they represent parts by weight and% by weight, respectively. In addition, if not particularly limited, the air permeability after the formation of the high-gloss coating layer is measured in accordance with JIS-P-8117 and expressed in seconds/100CC. The air permeability of the base paper after the undercoat layer is formed is measured in accordance with the method of ASTM-D-726B using a Gulli high-pressure air permeability tester, and is expressed in seconds/10CC.

The following examples were carried out according to the systems of I, II, and III respectively. In the printing evaluation of I and II, four colors of magenta, cyan, black, and yellow were printed as the ink, and the ink absorbency and printing density of the entire part (coated part) of the single color were visually evaluated. It is expressed as the average value of 4 color evaluations.

In the printing evaluation of III, the ink absorbency and printing density of four colors of magenta, cyan, black, and yellow were evaluated by visual inspection when they were overlapped and printed.

In addition, the evaluations of I, II, and III are expressed as relative evaluations within the respective systems.

Example I-1 uses 100 parts of amorphous silica as a pigment, 20 parts of polyvinyl alcohol as a binder, 5 parts of acrylic resin containing quaternary ammonium salt as a cationic resin, and 0.5 parts of polyphosphate soda as a dispersant , Prepared into a primer coating liquid with a solid content of 20%. This primer coating liquid was coated on a base paper with a basis weight of 100 g/m2 at a dry weight of 10 g/m2, using an air knife coater, and dried to obtain a primed base paper. The air permeability of this primer-coated base paper was measured with a Gulai high-pressure air permeability tester to be 5 seconds/10CC.

On the other hand, a coating solution with a solid content of 40% composed of 100 parts of styrene-2-hexyl methyl acrylate copolymer with a glass transition point of 80°C and 10 parts of calcium stearate as a mold release agent was prepared as a high Glossy coating liquid. After coating the high-gloss coating liquid on the above-mentioned undercoated base paper with a rubber roller, it was immediately crimped onto a mirror roll with a surface temperature of 75°C, dried and released from the mold to obtain high-gloss printing for ink jet recording. paper. The high-gloss coating amount at this time was 5 g/m2 in terms of the weight of the solid part.

Example I-2 prepared 100 parts of a composite of styrene-methyl acrylate copolymer and colloidal silica with a glass transition point of 70°C and 10 parts of calcium stearate as a release agent. The solid content was 40% The coating liquid is used as a high-gloss coating liquid. After coating the high-gloss coating liquid on the base paper with the primer layer of Example I-1 with a rubber applicator, it was immediately crimped onto a mirror roll with a surface temperature of 60°C, dried and released from the mold to obtain High gloss printing paper for ink jet recording. The high-gloss coating amount at this time was 2 g/m2 in terms of the weight of the solid part.

In Example I-3, except that the surface temperature of the mirror roll in Example I-1 was changed to 50°C, the other methods were the same as in Example I-1 to obtain high-gloss printing paper for ink jetting.

In Example I-4, a coating liquid with a solid content of 40% composed of 100 parts of an acrylate polymer having a glass transition point of 45°C and 5 parts of calcium stearate as a release agent was prepared as a high-gloss coating liquid. After the coating liquid was coated on the same base paper as the base paper used in Example I-1 with a rubber coating roller, it was immediately crimped on a mirror roll with a surface temperature of 40°C, dried and released from the mold to obtain an ink High gloss printing paper for jet recording. The high-gloss coating amount at this time was 3 g/m2 in terms of the weight of the solid part.

Example I-5 prepared 100 parts of a composite of styrene-methyl acrylate copolymer with a glass transition point of 95°C and colloidal silica, and 5 parts of ammonium oleate as a release agent with a solid content of 35%. The coating liquid is used as a high-gloss coating liquid. After the coating liquid was coated on the same base paper as the base paper used in Example 1 with a rubber coating roller, it was immediately crimped on a mirror roll with a surface temperature of 90°C, dried and released from the mold to obtain an ink jet High-gloss printing paper for recording. The high-gloss coating amount at this time was 2 g/m2 in terms of the weight of the solid part.

Example I-6 used 40 parts of clay as a pigment, 30 parts of light calcium carbonate, and 30 parts of heavy calcium carbonate, and added 5 parts of starch as a binder and 10 parts of styrene-butadiene copolymer latex. , 5 parts of quaternary ammonium salt-containing acrylic resin as a cationic resin, 0.5 parts of polyphosphoric acid soda as a dispersant, to prepare a primer coating liquid with a solid content of 55%. The coating liquid was coated on a base paper with a basis weight of 60 g/m2 at a dry weight of 20 g/m 2 using a blade coater, and dried to obtain a base paper with a primer. The air permeability of this primer-coated base paper was determined to be 50 seconds/10CC with a Gulai high-pressure air permeability tester.

The same high-gloss coating liquid as used in Example I-1 was used on the primed base paper, and the same method as in Example 1 was used to obtain high-gloss printing paper for ink jet recording.

In Example I-7, except that the temperature of the mirror roll in Example I-1 was changed to 90°C, the same method as in Example I-1 was used to obtain high-gloss printing paper for ink jet recording.

In Example I-8, except that the temperature of the mirror roll in Example I-2 was changed to 80°C, the same method as in Example I-2 was used to obtain high-gloss printing paper for ink jetting.

Comparative Example I-1 A coating solution with a solid content of 40% composed of 100 parts of a styrene-butadiene copolymer with a glass transition point of 0°C and 10 parts of calcium stearate as a release agent was prepared as a high glossCoating solution. Coating solution. The high-gloss coating liquid was coated on the same base coating base paper as in Example I-1 with a rubber roller, and then immediately crimped onto a mirror roll with a surface temperature of 60°C, dried and released from the mold to obtain an ink High gloss printing paper for jet recording. The high-gloss coating amount at this time was 2 g/m2 in terms of the weight of the solid part.

Comparative Example I-2 added 50 parts of clay as a pigment, 50 parts of heavy calcium carbonate, 5 parts of oxidized starch as a binder, 12 parts of styrene-butadiene copolymer latex, and 0.5 parts of polyacrylic acid soda as a dispersant It was prepared into a coating liquid for primer coating with a solid content of 60%. The coating liquid was coated on a base paper with a basis weight of 60 g/m2 at a dry weight of 20 g/m 2 using a blade coater, and dried to obtain a base paper with a primer. The air permeability of the base coated base paper was measured by a Gulli high-pressure air permeability tester to be 100 seconds/10CC. On the other hand, the solid content of 100 parts of clay, 10 parts of casein, 10 parts of styrene-butadiene copolymer (glass transition temperature of 10°C), and 10 parts of calcium stearate as a mold release agent was prepared. 45% of the coating liquid was used as a high-gloss coating liquid. The high-gloss coating solution was coated on the above-mentioned primer-coated base paper with a rubber roller, and then immediately crimped onto a mirror roll with a surface temperature of 75°C. After drying, it was released from the mold to obtain high-gloss ink jet recording. For printing paper, the high-gloss coating amount at this time is 15 g/m2 based on the weight of the solid part.

The results of the white paper gloss, inkjet printer recording suitability, and operability of the high-gloss printing paper thus obtained are shown in Table 1.

In addition, regarding the above-mentioned evaluation, the following method was used for evaluation.

The gloss of white paper is measured based on JIS-P8142.

Inkjet printer recording suitability/ink absorbency was printed using a color printer jet IO-735X (inkjet printer) manufactured by Sisbu Co., Ltd., and the dryness of the ink was visually evaluated.

: There is no stain at all when touched with a finger shortly after printing.

: It was slightly stained when touched with a finger shortly after printing, but it was almost dry.

: Shortly after printing, the ink part is slightly shiny, but there is no practical problem.

×: Due to poor ink drying, the ink flows during printing, which is not practical.

Operability of high-gloss printing paper : No problem, it can be operated.

: Low-speed operation, practically no problem.

×: Roller tearing occurred due to poor mold releasability.

Table 1

Effects As clearly shown by the results of Table 1, the high-gloss printing paper obtained by the method of the present invention is a high-gloss printing paper for ink jet recording with excellent surface gloss, excellent inkjet printer recording adaptability, and excellent productivity.

Example II-I The condensation of 90 parts of amorphous silica as a pigment, 10 parts of light calcium carbonate, 20 parts of polyvinyl alcohol as a binder, and 10 parts of dicyandiamide as a cationic resin with formaldehyde Dicyandiamide-based resin (trade name: Naufies FY/manufactured by Nikka Chemical Industry Co., Ltd.), 0.5 parts of sodium polyphosphate carbonate as a dispersant, was prepared into a primer coating liquid with a solid content of 15%. The coating liquid for undercoating was coated on a base paper with a basis weight of 100 g/m2 using an air knife coater so as to have a dry weight of 12 g/m2, and dried to obtain an undercoated base paper. The air permeability measured by the Gulai high-pressure air permeability tester is 4 seconds/10CC.

Another method is to prepare a high gloss coating solution from 40 parts of styrene-hexyl dimethyl acrylate copolymer with a glass transition point of 80°C, 60 parts of colloidal silica, and 2 parts of stearic acid as a release agent. A high-gloss coating liquid with a solid content of 30% composed of calcium. This coating solution was coated on the above-mentioned undercoated base paper with an applicator roller, and then immediately crimped onto a mirror roll with a surface temperature of 85°C. After drying, it was demolded to obtain ink jet recording. High gloss printing paper. The coating amount at this time was 5 g/m2 based on the weight of the solid part. The air permeability of this high-gloss printing paper is 120 seconds/100CC (JIS-O-811).

Example II-2 In Example II-1, the high-gloss printing paper obtained was carried out in the same manner as in Example II-1 except that the surface temperature of the mirror roll was changed from 85°C to 70°C to obtain High gloss printing paper for inkjet water recording. The air permeability of this high-gloss printing paper is 80 seconds/100CC.

Example II-3 As a high-gloss coating solution, a solid content of 35% composed of 100 parts of styrene-methyl acrylate copolymer with a glass transition point of 50°C and 5 parts of ammonium oleate as a release agent was prepared. Coating liquid for high gloss. This coating solution was coated on the primed base paper obtained in Example II-1 with a rubber coating roller, and then immediately crimped onto a mirror roll with a surface temperature of 60°C, and dried to release it from the mold. A high-gloss printing paper for inkjet water recording was obtained. The coating amount at this time was 1 g/m2 based on the weight of the solid part. The air permeability of this high-gloss printing paper is 100 seconds/100CC.

Example II-4 As a high-gloss coating solution, 100 parts of a composite of styrene-methyl acrylate copolymer and colloidal silica with a glass transition point of 70°C were prepared, and 3 parts of ammonium oleate as a release agent The composition has a high gloss coating liquid with a solid content of 40%. This coating liquid was coated on the primed base paper obtained in Example II-1 with a rubber coating roller, and then immediately crimped onto a heated mirror roll with a surface temperature of 65°C. After drying It was released from the mold to obtain high-gloss printing paper for inkjet water recording. The coating amount at this time was 6 g/m2 based on the weight of the solid part. The air permeability of this high-gloss printing paper is 75 seconds/100CC.

In Example II-5, 70 parts of MgCO3, 30 parts of heavy calcium carbonate, 5 parts of oxidized starch and 10 parts of styrene-butadiene copolymer latex were added as the pigment of the primer coating liquid, as Dicyandiamide-based resin (trade name: Nafivex FY/manufactured by Nikka Chemical Industry Co., Ltd.) of 5 parts of dicyandiamide and formaldehyde water of cationic resin, and 0.4 part of sodium polyphosphate carbonate as a dispersant to prepare a solid A 30% primer coating liquid. The coating liquid for undercoating was coated on a base paper having a basis weight of 60 g/m2 with a blade coater so that the dry weight was 15 g/m2, and dried to obtain a base paper having a primer. The air permeability measured by the Gulai high-pressure air permeability tester is 10 seconds/10CC.

Next, the high-gloss coating liquid used in Example II-1 was coated on the primed base paper, and the high-gloss printing paper for inkjet water recording was obtained in the same manner as in Example II-1. . The air permeability of this high-gloss printing paper is 220 seconds/100CC.

Example II-6 70 parts of Al2O3, 30 parts of amorphous silica, 5 parts of oxidized starch, 15 parts of polyvinyl alcohol as the binder, and 8 parts of the cationic resin were added as the pigment of the primer coating liquid. One part of polyethylene polyamine resin (trade name: Nafives RP/manufactured by Nikka Chemical Industry Co., Ltd.), 0.4 part of sodium polyphosphate carbonate as a dispersant, was prepared into a coating liquid for primer coating with a solid content of 30%. This coating liquid for undercoating was coated on a base paper with a basis weight of 80 g/m2 using a knife coater so that the dry weight was 9 g/m2, and dried to obtain an undercoated base paper. The air permeability measured by the Gulai high-pressure air permeability tester is 7 seconds/10CC.

The high-gloss coating liquid used in Implementation II-1 was coated on this primed base paper, and the same method as in Example II-1 was used to obtain high-gloss printing paper for inkjet water recording. The air permeability of this high-gloss printing paper is 250 seconds/100CC.

Example II-7 Add 80 parts of MgO as the pigment of the primer coating liquid, 20 parts of pottery clay, 19 parts of polyvinyl alcohol as the binder, and 8 parts of the dipropenylamine acrylamide as the cationic resin Resin (trade name: Sushray-Gijin 1001/Sumitomo Chemical Industry Co., Ltd.), 0.4 parts of sodium polyphosphate carbonate as a dispersant, was prepared into a coating liquid for primer coating with a solid content of 30%. This coating liquid was coated on a base paper with a basis weight of 80 g/m2 using a blade coater so that the dry weight was 14 g/m2, and dried to obtain an undercoated base paper. The air permeability measured by the Gulai high-pressure air permeability tester is 7 seconds/10CC.

The high-gloss coating liquid used in Example II-1 was coated on this undercoated base paper, and a high-gloss printing paper for inkjet water recording was obtained in the same manner as in Example II-1. The air permeability of this high-gloss printing paper is 180 seconds/100CC.

In Example II-8, 80 parts of alumina, 20 parts of amorphous silica, 15 parts of polyvinyl alcohol, and 0.5 parts of sodium polyphosphate carbonate were added to prepare a primer coating liquid with a solid content of 20%. The coating liquid for undercoating was coated on a base paper with a basis weight of 100 g/m2 using an air knife coater so as to have a dry weight of 12 g/m2, and dried to obtain an undercoated base paper. The air permeability measured by the Gulai high-pressure air permeability tester is 15 seconds/10CC.

On the other hand, as a high-gloss coating solution, 50 parts of styrene-hexyl dimethyl acrylate copolymer with a glass transition point of 80°C, 50 parts of colloidal silica, and 2 parts of calcium stearate as a release agent were prepared. The composition has a 30% solid content coating liquid for high gloss. Coat this coating liquid on the above-mentioned undercoated base paper with a rubber roller, and then immediately press-bond it on a mirror roll with a surface temperature of 85°C, and then release it from the mold after drying to obtain inkjet water recording Use high-gloss printing paper. The coating amount at this time was 6 g/m2 based on the weight of the solid part. The air permeability of this high-gloss printing paper is 400 seconds/100CC (JIS-P-8117).

Example II-9 Add 100 parts of amorphous silica as a pigment, 15 parts of polyvinyl alcohol as a binder, and 1.0 part of sodium polyphosphate carbonate as a dispersant to prepare a primer with a solid content of 15% Coating liquid. The coating liquid for undercoating was coated on a base paper with a basis weight of 100 g/m2 using an air knife coater at a dry weight of 6 g/m2, and dried to obtain a base paper having a primer. The air permeability measured by the Gulai high-pressure air permeability tester is 4 seconds/10CC.

On the other hand, as a high-gloss coating solution, 50 parts of styrene-hexyl dimethyl acrylate copolymer with a glass transition point of 80°C, 50 parts of colloidal silica, and 2 parts of calcium stearate as a release agent were prepared. The composition consists of a 30% solid content high-gloss coating liquid. After this coating liquid is coated on the above-mentioned undercoated base paper with a rubber coating roller, it is immediately crimped onto a mirror roll with a surface temperature of 85°C After drying, the mold was released to obtain high-gloss printing paper for inkjet water recording. The coating amount at this time was 6 g/m2 based on the weight of the solid part. The air permeability of this high-gloss printing paper is 100 seconds/100CC (JIS-P-8117).

Comparative Example II-1 As a high-gloss coating solution, 40 parts of styrene-hexyl dimethyl acrylate copolymer with a glass transition point of 0°C, 60 parts of colloidal silica, and 5 parts of ammonium oleate as a release agent were prepared A high-gloss coating liquid with a composition solid content of 35%. This coating solution was coated on the primed base paper obtained in Example II-1 with a rubber roller, and then immediately crimped onto a mirror roll with a surface temperature of 60°C, and dried to remove it. Mold to obtain high gloss printing paper for inkjet water recording. The coating amount at this time was 5 g/m2 based on the weight of the solid part. The air permeability of this high-gloss printing paper is 450 seconds/100CC.

Comparative Example II-2 is a high-gloss coating liquid, prepared with 100 parts of a styrene-butadiene copolymer with a glass transition point of 30°C and 5 parts of ammonium oleate as a release agent with a solid content of 35%. Coating liquid for gloss. This coating liquid was coated on the primed base paper obtained in Example II-1 with a stripping roller, and then immediately crimped onto a mirror roll with a surface temperature of 80°C, and then stripped off immediately. Mold to obtain high-gloss printing paper for inkjet water recording. The coating amount at this time was 5 g/m2 based on the weight of the solid part. The air permeability of this high-gloss printing paper is 1300 seconds/100CC.

Comparative Example II-3 is a high-gloss coating liquid, prepared with 100 parts of styrene-butadiene copolymer with a glass transition point of 0°C and 5 parts of ammonium oleate as a release agent with a solid content of 35%. Glossy coating liquid. This coating solution was coated on the primed base paper obtained in Example II-1 with an applicator roll, and then immediately crimped onto a mirror roll with a surface temperature of 60°C, and dried to remove it. Mold to obtain high gloss printing paper for inkjet water recording. The coating amount at this time was 5 g/m2 based on the weight of the solid part. The air permeability of this high-gloss printing paper is 2200 seconds/100CC.

Comparative Example II-4 is a high-gloss coating solution, prepared from 100 parts of clay, 10 parts of casein, 10 parts of styrene-methyl methacrylate with a glass transition point of 30°C, and 10 parts of stearic acid as a release agent A high-gloss coating liquid with a solid content of 45% composed of calcium. This coating liquid was coated on the base coated paper obtained in Example II-1 with a rubber roller, and then immediately crimped onto the mirror roll with a surface temperature of 75°C, and then it was removed after drying. Mold to obtain high gloss printing paper for inkjet water recording. The coating amount at this time was 15 g/m2 based on the weight of the solid part. The air permeability of this high-gloss printing paper is 5000 seconds/100CC.

Comparative Example II-5 added 50 parts of clay as a pigment, 50 parts of light calcium carbonate, 5 parts of oxidized starch as a binder, 20 parts of styrene-butadiene copolymer latex, and 0.5 part of polyphosphoric acid as a dispersant Sodium carbonate was prepared into a coating liquid for primer coating with a solid content of 50%. The coating solution for undercoating was coated on a base paper with a basis weight of 100 g/m2 using an air knife coater at a dry weight of 12 g/m2, and dried to obtain an undercoated base paper. The air permeability performed with the Gulai high-pressure air permeability tester is 200 seconds/10CC.

On the other hand, the coating liquid of Comparative Example II-4 was coated on the above-mentioned undercoated base paper with a rubber roller, and then immediately pressed on a mirror roll with a surface temperature of 85°C, and dried to make it The mold was released to obtain high-gloss printing paper for inkjet water recording. The coating amount at this time was 15 g/m2 based on the weight of the solid part. The air permeability of this high-gloss printing paper is 10000 seconds/100CC.

The results of the white paper gloss, inkjet water recording suitability, and operability of the high gloss printing paper thus obtained are shown in Table 2.

In addition, the above-mentioned evaluation was evaluated by the method described below.

The gloss of white paper is measured in accordance with the standard of JIS-P8142.

Inkjet water recording suitability Printing was performed with a color printer jet IO-735X (apparatus for inkjet water recording) manufactured by Sis-be Co., Ltd., and the dryness of the ink was visually evaluated.

: There is no stain at all when touched with a finger shortly after printing.

: Touching with fingers shortly after printing is slightly stained, but almost dry.

: Shortly after printing, the ink part is slightly shiny, but there is no practical problem.

×: Due to poor ink drying, ink flow in printing is not practical.

The color rendering property of the ink for inkjet water recording after recording was printed with a color printer jet IO-735X manufactured by Shis-be Co., Ltd., and the ink density was visually evaluated.

: The color density is good.

: The color density is slightly weak, but at a level where there is no practical problem.

×: The color density is weak and it is not practical.

Operability of high-gloss printing paper : It can be operated without any problems.

: It is a low speed, but at a level that can be operated.

×: The roller was torn due to poor mold releasability, and operation was impossible.

Table 2

As the results of Table 2 clearly show, the high gloss printing paper of the present invention has excellent surface gloss and inkjet water recording adaptability, and can be produced with high efficiency.

Example III-1 Added 20 parts of polyvinyl alcohol as a binder to 100 parts of amorphous silica as a pigment and 5 parts of polyvinyl from a polyvinyl polyamine dicyandiamide ammonium salt polycondensate as a cationic resin Polyamine resin (trade name: PNF70/manufactured by Nikka Chemical Industry Co., Ltd.), 0.5 parts of sodium polyphosphate carbonate as a dispersant were mixed to prepare a primer coating liquid with a solid content of 15%. The coating liquid for undercoating was coated on a base paper with a basis weight of 100 g/m2 using an air knife coater so that the dry weight was 10 g/m2, and dried to obtain a base paper having a primer. The air permeability of this undercoated base paper is 4 seconds/10CC as measured by the Gulai high-pressure air permeability tester.

On the other hand, the solid content of 50 parts of styrene-hexyl dimethyl acrylate copolymer with a glass transition point of 80°C, 50 parts of colloidal silica, and 2 parts of calcium stearate as a mold release agent was prepared to have a solid content of 35%. The high gloss coating liquid. Coat this high-gloss coating liquid on the above-mentioned undercoated base paper with a rubber roller, and then immediately press-bond it on a mirror roll with a surface temperature of 75°C. After drying, it is released from the mold to obtain an inkjet High-gloss printing paper for water recording. The high-gloss coating amount at this time was 5 g/m2 based on the weight of the solid part. According to JIS-P-8117, the air permeability is 50 seconds/100CC.

Example III-2 As a high-gloss coating solution, it was made up of 100 parts of a composite of styrene-methyl acrylate copolymer with a glass transition point of 70°C and colloidal silica, and 3 parts of ammonium oleate as a release agent The solid content of the coating solution is 40%. This high-gloss coating solution was coated on the primed base paper in Example III-1 with an applicator roll, and then immediately crimped onto the mirror roll with the surface temperature heated to 65°C. After drying, The mold was released to obtain high-gloss printing paper for inkjet water recording. The high-gloss coating amount at this time was 6 g/m2 based on the weight of the solid part. The air permeability measured in accordance with JIS-P-8117 is 60 seconds/100CC.

Example III-3 As a high-gloss coating liquid, a coating with a solid content of 35% composed of 100 parts of a styrene-methyl acrylate copolymer with a glass transition point of 50°C and 5 parts of ammonium oleate as a release agent was prepared. Cloth liquid. This high-gloss coating liquid was coated on the same base-coated base paper used in Example III-1 with a rubber roller, and then immediately crimped onto a mirror roll with a surface temperature of 60°C, and dried Then, it was released from the mold to obtain high-gloss printing paper for inkjet water recording. The high-gloss coating amount at this time was 1 g/m2 based on the weight of the solid part. The air permeability is 80 seconds/100CC.

Example III-4 In 100 parts of amorphous silica as a pigment, 10 parts of polyvinyl alcohol as a binder and 10 parts of a dicyandiamide polyalkylene polyamine condensate (trade name) were added as a cationic resin. : Trade name: Nafice E-117 / Nikka Chemical Industry Co., Ltd.). 0.5 part of sodium polyphosphate carbonate as a dispersant was mixed to prepare a primer coating liquid with a solid content of 15%. The coating liquid for undercoating was coated on a base paper with a basis weight of 100 g/m2 using an air knife coater so as to have a dry weight of 5 g/m2, and dried to obtain a base paper having a primer. The air permeability of this undercoated base paper measured by the Gulai high-pressure air permeability tester is 4 seconds/10CC.

On the other hand, the solid content of 50 parts of styrene-hexyl dimethyl acrylate copolymer with a glass transition point of 80°C, 50 parts of colloidal silica, and 2 parts of calcium stearate as a mold release agent was prepared to have a solid content of 35%. The high gloss coating liquid. Coat this high-gloss coating liquid on the above-mentioned undercoated base paper with a rubber roller, and then immediately press-bond it on a mirror roll with a surface temperature of 75°C, and then release it from the mold after drying to obtain an inkjet High-gloss printing paper for water recording. The high-gloss coating amount at this time was 5 g/m2 based on the weight of the solid part. The air permeability is 50 seconds/100CC.

Example III-5 In Example III-1, except that polyalkanol allylamine was used as the cationic resin, a high-gloss printing paper for inkjet water recording was obtained in the same manner as in Example III-1. The air permeability of this undercoated base paper is 4 seconds/10CC as measured by the Gulai high-pressure air permeability tester. In addition, the air permeability after the formation of the high-gloss coating layer is 50 seconds/100CC.

Example III-6 In Example III-2, except that dimethyldiallylammonium chloride was used as the cationic resin, the same method as Example III-2 was used to obtain high-gloss printing for inkjet water recording paper. The air permeability of the undercoated base paper is 3 seconds/10CC measured with a Gulai high-pressure air permeability tester. In addition, the air permeability after the formation of the high-gloss coating layer was 55 seconds/100CC.

Example III-7 In Example III-1, except that no cationic resin was added, a high gloss printing paper for inkjet water recording was obtained in the same manner as in Example III-1. The air permeability of the undercoated base paper is measured by a Gulai high-pressure air permeability tester at 2 seconds/10CC. In addition, the air permeability after the formation of the high-gloss coating layer is 60 seconds/100CC.

Comparative Example III-1 As a high-gloss coating liquid, a coating with a solid content of 35% composed of 100 parts of a styrene-butadiene copolymer with a glass transition point of 0°C and 5 parts of ammonium oleate as a release agent was prepared. Cloth liquid. This high-gloss coating solution was coated on the primed base paper of Example III-1 with an applicator roll, and then immediately crimped on a mirror roll with a surface temperature of 60°C, and dried to release it from the mold , To obtain high-gloss printing paper for inkjet water recording. The high-gloss coating amount at this time was 5 g/m2 based on the weight of the solid part. The air permeability after the formation of the high-gloss coating layer is 320 seconds/100CC.

Comparative Example III-2 is a high-gloss coating liquid, prepared from 100 parts of silica, 10 parts of casein, 10 parts of styrene-methyl methacrylate with a glass transition point of 30°C, and 10 parts of hard mold release agent. A coating liquid with a solid content of 45% composed of calcium fatty acid. This high-gloss coating solution was coated on the primed base paper of Example III-1 with a rubber roller, and then immediately crimped on the mirror roll with a surface temperature of 75°C, and then it was released from the mold after drying , To obtain high-gloss printing paper for inkjet water recording. The high-gloss coating amount at this time was 15 g/m2 based on the weight of the solid part. The air permeability after the formation of the high-gloss coating layer is 1500 seconds/100CC.

Table 3 shows the results of the white paper gloss, inkjet printer suitability, and operability of the high-gloss printing paper thus obtained.

In addition, the above-mentioned evaluation was evaluated by the method described below.

The gloss of white paper is measured in accordance with the JIS-P8142 standard.

Ink absorbency at the time of inkjet water recording, inkjet water recording was performed using a color printer jet IO-735X manufactured by Shigebe Co., Ltd., and the ink dryness at this time was visually evaluated.

: There is no stain at all when touched with a finger shortly after printing.

: Touched with a finger shortly after printing, although it is slightly stained, it is almost dry.

: Shortly after printing, the ink part is slightly shiny, but there is no practical problem.

×: Due to poor ink drying, the ink flows during printing and cannot be used.

The ink color developability after inkjet recording was printed using a color printer jet IO-735X manufactured by Sis-be Co., Ltd., and the ink density (color developability) was visually evaluated.

: The color density is very good.

: The color density is good.

×: The color density is light and it is not practical.

The water resistance of inkjet water recording (after printing) was printed using a color printer jet IO-735X manufactured by Sis-Bei Co., Ltd., and was immersed in water for about 10 minutes to visually evaluate the change in the printed part.

: The printed part neither flows into water nor penetrates.

×: The printed part becomes blurred due to flowing into the water.

Operability of high-gloss printing paper : It can be operated without any problems.

: Although it is a low speed, it is at an operable level.

×: The roller was torn due to poor mold releasability, making it impossible to operate.

In addition, particularly when the high-gloss printing paper according to the present invention is used for recording with an inkjet water recording device in which thermal energy is applied to the water-based ink to eject the ink, excellent inkjet water recording can be seen. Therefore, using this inkjet water recording device (color printing jet printer: BJC-820J/manufactured by Kounn Co., Ltd.), the examples III-1 to III-7 and the comparative examples III-1 to related to the present invention were opposed to The high-gloss printing paper of III-2 was subjected to inkjet water recording in the same manner, and the obtained results are shown in Table 4.

table 3

Table 4

Brief Description of the Drawings Fig. 1 is a longitudinal sectional view of a recording head of an inkjet water recording apparatus.

Fig. 2 is a cross-sectional view of the recording head of the inkjet water recording apparatus.

Fig. 3 is a side view of the appearance of a recording head in which the recording head shown in Fig. 1 is multiplexed.

Fig. 4 is a survey view showing an example of an inkjet water recording device.

DESCRIPTION OF SYMBOLS 13: Recording head 14: Ink channel 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: Nozzle 23: Meniscus 24: Recording droplet 25: Recording sheet 26: Multi-channel 27: Glass plate 28: Heating head 51: Paper feeding part 52: Paper feed roller 53: Paper discharge roller 61: Plate 62: Cover 63: Ink absorber 64: Ejection recovery part 65: Recording head 66: Carriage 67: Guide shaft 68: Motor 69 : Ribbon