JP2010099898A - Glossy paper for inkjet recording and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a recyclable glossy paper for inkjet recording, which has high glossy feeling of a silver halide photography while having satisfactory ink absorbing property, has image quality and uniform gloss equal to a medium produced by using a photographic paper substrate or a film substrate and is recycleable, superior in continuous operability. <P>SOLUTION: The method of manufacturing the gloss paper for inkjet recording is a method of manufacturing a cast coat paper which is carried out by providing one or more ink receiving layers at least on one surface of a substrate and providing a gloss developing layer containing a pigment and a binder on the ink receiving layer, wherein the gloss development layer is formed by applying a coating liquid for the glass developing layer to form a coating layer, applying a water based treating liquid on the coating layer and bringing the wet state coating layer into press-contact with a heated mirror surface to form the cast coat paper by a cast coat method. As the water based treating liquid, one containing one or both of a silicone based surfactant or/and fluorine based surfactant is used. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to glossy paper for ink-jet recording, and relates to a recording paper having a glossiness similar to that of a silver salt photograph and having a printing quality close to photographic image quality and a method for producing the same.

The ink jet recording system is a system in which ink droplets are ejected and deposited on recording paper to form dots and recording is performed. In recent years, recording with high print quality has become possible due to technological advances in ink jet printers, inks, and recording media. As an element required for an inkjet recording medium,
(A) fast ink absorption and drying, (b) high printing density, (c) no dot spread, whiskers, or both. If ordinary plain paper has a certain size or more, it can be expected to have a certain level of printing quality with less blur. On the other hand, when a higher print quality is required, a dedicated medium in which an ink receiving layer suitable for the ink of an ink jet printer is provided on various media on the medium is used. Many of these ink-jet recording media have paper and / or film as a support and a pigment coating layer mainly composed of a pigment and a binder or a resin coating layer not containing a pigment provided on the surface. used.

Inkjet dedicated media are further classified into matte and glossy media from the surface state. The latter glossy medium is used when image quality closer to silver halide photography is required. The properties required for these glossy media include (d) high dot roundness and good image reproducibility in addition to the above properties (e) good water resistance and light fastness (f). For example, the glossiness of the image area and the white paper portion is high.

  Various methods have been proposed for producing glossy media in order to maintain the properties (b) to (f) while maintaining the ink absorbability and drying properties of (a). There are a method of forming an ink receiving layer by a cast coating method to give gloss to the surface and a method of forming an ink receiving layer on a photographic paper substrate.

  In general, the former is easier to control the ink absorptivity of (a) than the latter, but (d) the dot roundness, image reproducibility, (f) the image area, and the glossiness of the blank paper portion. Inferior to the latter. When the latter substrate for photographic paper is generally called RC paper (resin-coated paper), a polyethylene film layer is formed on the paper substrate, and therefore when an ink receiving layer is formed on the surface thereof, Since the film surface is smooth, the surface of the ink receiving layer is also smooth, and a glossy surface is easily formed.

  However, the overall cost of the method of forming an ink receiving layer on a photographic paper substrate requires a large amount of coating in order to increase ink absorbency, and the substrate itself is more expensive than paper. As a result, it is higher than the former glossy medium produced by the cast coating method. In addition, when it is discarded, there is a problem that it cannot be recycled because it is a composite material.

  The glossy paper for ink jet recording by the cast coating method is advantageous in this respect, but there are problems in the quality aspects (d) and (f) described above, and various proposals have been made to solve these problems. Yes.

  For example, there is a proposal that an inkjet recording paper having high surface smoothness and excellent image quality can be obtained by defining the average roughness, glossiness and air permeability of the recording paper on the surface of the recording layer (for example, , See Patent Document 1).

  There is also a proposal that an inkjet recording paper having excellent gloss and ink receptivity can be obtained by defining the size and number of cracks on the surface of the recording layer (see, for example, Patent Document 2).

  In recent years, a technique for improving releasability from a cast drum has been disclosed (see, for example, Patent Document 3).

Japanese Patent Laid-Open No. 06-72017 Japanese Patent Laid-Open No. 11-348416 JP 2007-261104 A

  As described in Patent Document 1 or 2, the cast coating method is a manufacturing method in which a coating layer is pressed against a heated mirror drum while it is wet and dried to transfer the mirror surface to the coating layer. . Therefore, since the production speed tends to be lower than that of a normal coating method, a technique for improving the production efficiency is indispensable. In particular, releasability from the mirror drum, application spots and repelling of processing liquids such as a glossy layer coating liquid and a coagulating liquid are factors that greatly reduce production efficiency. Also, due to bubbling of the processing liquid such as the gloss developing layer coating liquid and coagulating liquid, the fine coating layer drops off (pick) and pinhole defects (pits) in the coating layer when releasing from the cast drum May occur, which is also a cause of lowering production efficiency. However, regarding these glossy papers for ink jet recording, there is almost no disclosure of means for solving the problems peculiar to the cast coating method.

  Patent Document 3 does not describe the adverse effects of foaming when the surface tension is reduced, and is unsatisfactory.

  Therefore, the results of the examination of continuous operability by the present inventors have led to the conclusion that the contents of the proposals are unsatisfactory from the viewpoint of continuous productivity improvement. In view of such a current situation, in the method for producing glossy paper for ink jet recording produced by the cast coating method, it has an image quality and a uniform glossiness exceeding the media produced using a photographic paper substrate or a film substrate. However, at present, there is no production method having very excellent continuous operability.

  Accordingly, an object of the present invention is to provide a glossy paper for inkjet recording by the cast coating method, and has a glossiness equivalent to that of a silver salt photograph while having good ink absorbency, which is a problem of the prior art. , Manufacturing method having extremely high continuous operability for providing a recyclable recording medium having an image quality and uniform glossiness comparable to a medium manufactured using a photographic paper base or a film base Is to provide.

  The inventors adopt the following configuration for the above purpose. That is, in the method for producing glossy paper for ink jet recording according to the present invention, a gloss developing layer comprising at least one ink receiving layer on at least one side of a substrate, and containing a pigment and a binder on the ink receiving layer. The gloss developing layer is coated with a coating liquid for gloss developing layer to provide a coating layer, and then an aqueous treatment liquid is applied onto the coating layer, and the coating in a wet state is applied. A method for producing a cast coated paper formed by a cast coating method in which a layer is brought into pressure contact with a heated mirror surface, wherein the water-based treatment liquid is either a silicone-based surfactant or a fluorine-based surfactant, or a combination thereof. It is characterized by using an aqueous processing solution containing both.

  In the method for producing glossy paper for ink jet recording according to the present invention, it is preferable that the surface tension of the aqueous processing liquid is in the range of 25 to 55 mN / m. When the surface tension of the aqueous treatment liquid is 25 to 55 mN / m, it is possible to achieve both suppression of repellency and suppression of foaming after application of the aqueous treatment liquid.

  In the method for producing glossy paper for ink jet recording according to the present invention, after the cast coating method has applied the glossy layer coating liquid and provided the coating layer, the coating layer is in a wet state. Among these, it is preferable to apply a wet treatment to the heated mirror surface after applying the aqueous treatment liquid containing the coagulant. According to this method, it is possible to produce glossy paper for ink jet recording having excellent ink absorbability.

  In the method for producing glossy paper for ink jet recording according to the present invention, the binder of the glossy layer preferably contains polyvinyl alcohol. By containing polyvinyl alcohol, it is possible to produce glossy paper for ink jet recording that can achieve both excellent glossiness and ink absorbability.

  In the method for producing glossy paper for ink-jet recording according to the present invention, the aqueous processing liquid preferably contains a boron compound as the coagulant. By containing a boron compound, it is possible to produce glossy paper for ink jet recording having a more excellent gloss feeling.

  In the method for producing glossy paper for ink-jet recording according to the present invention, the aqueous treatment liquid preferably contains a cationic polymer. By containing the cationic polymer, it is possible to produce glossy paper for ink jet recording having excellent water resistance.

  In the method for producing glossy paper for ink jet recording according to the present invention, the pigment of the glossy layer is preferably alumina having an average particle size of 500 nm or less, silica having an average particle size of 500 nm or less, or both. . By using alumina and / or silica having an average particle diameter of the pigment of 500 nm or less, it is possible to produce glossy paper for ink jet recording that can achieve both excellent glossiness and ink absorbability.

  The glossy paper for ink jet recording according to the present invention is manufactured by the method for producing a glossy paper for ink jet recording according to the present invention.

  The method for producing a glossy paper for ink-jet recording of the present invention is a glossy paper for ink-jet recording produced by a cast coating method, while at the same time achieving a very good surface gloss and ink absorbency at a high level, and The present invention provides a method for producing glossy paper having good color developability at extremely high continuous operation. Further, in the present invention, since paper is used as a base material, the manufacturing cost is low compared to a photographic paper base material having a film layer, and it can be recycled when discarded, which is also preferable from the viewpoint of effective use of resources. .

  Next, the present invention will be described in detail. The present invention is not construed as being limited to these descriptions, and the embodiment may be modified as long as the effects of the invention are achieved.

  In the method for producing glossy paper for ink-jet recording according to the present invention, at least one ink receiving layer is provided on at least one side of a substrate, and a gloss developing layer containing a pigment and a binder is provided on the ink receiving layer. The gloss developing layer is coated with a coating liquid for gloss developing layer to provide a coating layer, and then an aqueous treatment liquid is applied on the coating layer to form the coating layer in a wet state. A method for producing a cast-coated paper formed by a cast-coating method in which a heated mirror surface is pressed, wherein the water-based treatment liquid includes one or both of a silicone-based surfactant and a fluorine-based surfactant. Use water-based treatment solution.

  As the base material used in the present invention, a paper base material such as normal high quality paper, medium quality paper, white paperboard or the like is used. Considering the case of recycling as fuel, it is desirable to use ECF (Elemental Chlorine Free) pulp or TCF (Totally Chlorine Free) pulp having a low chlorine content as raw material pulp. The Canadian standard freeness (CSF) of the pulp used for the substrate is preferably 400 to 580 ml, more preferably 450 to 550 ml. When the Canadian standard freeness is 400 to 580 ml, the air permeability resistance of the base material is reduced, and the coating speed can be increased, so that the cast coating productivity is excellent.

  In order to suppress excessive penetration of the coating solution at the time of cast coating, it is preferable to use a substrate coated with a water-soluble polymer such as starch or polyvinyl alcohol by a size press.

  In the glossy paper for ink jet recording of the present invention, one or more ink receiving layers are provided under the glossy expression layer. The ink receiving layer is mainly composed of a white pigment and a binder component.

  The pigment used in the ink receiving layer contains at least one known white pigment, such as kaolin, talc, calcium carbonate, magnesium carbonate, barium sulfate, calcium sulfate, titanium dioxide, zinc oxide, zinc sulfate, and carbonate. White inorganic pigments such as zinc, calcium silicate, aluminum silicate, magnesium silicate, diatomaceous earth, aluminum hydroxide, magnesium hydroxide, satin white, synthetic silica, colloidal silica, and alumina, or organic such as acrylic-styrene, ethylene, vinyl chloride, nylon Pigments.

  The binder of the ink receiving layer used in the present invention is polyvinyl alcohol, polyvinyl acetal, oxidized starch, etherified starch, carboxymethyl cellulose, hydroxyethyl cellulose, casein, gelatin, soy protein, polyethyleneimide resin, polyvinyl pyrohydrin Resins, polyacrylic acid or copolymers thereof, maleic anhydride copolymers, acrylamide resins, acrylate resins, polyamide resins, polyurethane resins, polyester resins, polyvinyl butyral resins, alkyd resins, epoxy resins Resin, epichlorohydrin resin, urea resin, melamine resin, styrene-butadiene copolymer, methyl methacrylate-butadiene copolymer, acrylic ester, methacrylic ester polymer or copolymer Acrylic polymer latexes of polymer such as ethylene - resins of the vinyl polymer latexes such as vinyl acetate copolymer and the like, used alone or in combination. The amount of the binder used is determined in consideration of the printability of the recording medium, the strength of the ink receiving layer, and the coating liquid property. Usually, it is added in the range of 1 to 200 parts by mass with respect to the mass of the pigment in the ink receiving layer. Preferably, it is added in the range of about 5 to 100 parts by mass. If it is less than 1 part by mass, the coating layer strength may decrease. If it exceeds 200 parts by mass, the ink absorbability may decrease.

  In the ink receiving layer, it is preferable to add a cationic polymer in addition to the pigment and the binder. As an action of the cationic polymer, it reacts with an anionic component in the dye used in the ink to form a water-insoluble salt, so that the ink is more firmly fixed on the ink receiving layer, Water resistance is improved. Examples of such cationic polymers include polyethyleneimine, epichlorohydrin-modified polyalkylamine, polyamine, polyamine polyamide epichlorohydrin, dimethylamine ammonia epichlorohydrin, polyvinylbenzyltrimethylammonium halide, polydiacryldimethylammonium halide, polydimethylaminoethyl methacrylate hydrochloride, Polyvinylpyridium halide, cationic polyacrylamide, cationic polystyrene copolymer, diallyldimethylammonium chloride polymer, diallyldimethylammonium chloride sulfur dioxide copolymer, diallyldimethylammonium chloride amide copolymer, dicyandiamide formalin polycondensate, dicyandiamide Diethylenetriamine polycondensate, Rialylamine, polyallylamine hydrochloride, polyacrylamide resin, polyamide epoxy resin, melamine resin acid colloid, urea resin, cation modified PVA, amino acid type amphoteric surfactant, betaine type compound, other quaternary ammonium salts, etc. are used It is done. Although the addition amount is not particularly limited, it is used in the range of 1 to 50 parts by mass with respect to 100 parts by mass of the total pigment in the ink receiving layer. Preferably, it is added in the range of about 5 to 40 parts by mass. If the amount is less than 1 part by mass, the water resistance of the printed part may decrease. If it exceeds 50 parts by mass, the ink absorbability may be inferior.

  Other additives include antifoaming agents, lubricants, dispersants, wetting agents, fluorescent whitening agents, coloring dyes, coloring pigments, thickeners, preservatives, water-proofing agents, UV absorbers, as necessary. Antioxidants can be used.

As a coating method of the coating liquid for forming the ink receiving layer, a known coating machine such as an air knife, a roll coater, a bar coater, a comma coater or a blade coater is used. The coating amount is not particularly limited, but if the coating amount is too small, the ink absorbability is inferior, and therefore it is preferably 5 g / m ² or more in terms of solid content. Moreover, when there is too much coating amount, binder migration generate | occur | produces at the time of glossy expression layer coating, and since there exists a possibility that the scratch resistance of the glossy expression layer surface may fall, 20 g / m < ² > or less is preferable. More preferably 6 to 15 g / ^{m 2.} The ink receiving layer coating liquid may be applied twice or more to form two or more ink receiving layers.

  Further, in order to obtain a certain smoothness after coating, the ink receiving layer can be processed by a known calendar device such as a super calendar, a machine calendar, or a soft calendar.

  Examples of pigments to be included in the glossy layer include spherical colloidal silica, aggregated colloidal silica in which a plurality of spherical colloidal silicas are randomly bonded, chain colloidal silica in which a plurality of spherical colloidal silicas are bonded in a chain, vapor phase method silica, Precipitation method silica, gel method silica, silica doped with metal oxide such as alumina modified silica, various types of alumina (γ-alumina, θ-alumina, σ-alumina, pseudoboehmite, etc.) can be used alone or It can be used in combination. The average particle size of the pigment is preferably 500 nm or less from the balance between glossiness and ink absorbability. More preferably, the average particle size is 5 nm to 400 nm. More preferably, it is 10 nm-350 nm. However, the measurement method of the average particle diameter is obtained by a dynamic light scattering method (for example, DLS-6500, manufactured by Otsuka Electronics Co., Ltd.). It is also possible to obtain the value by directly observing with a field emission type electron microscope capable of high magnification observation.

  As a binder to be included in the glossy layer, polyvinyl alcohol (including modified polyvinyl alcohol such as silanol-modified polyvinyl alcohol and carboxyl-modified polyvinyl alcohol), polyvinyl acetal, oxidized starch, etherified starch, carboxymethylcellulose, hydroxyethylcellulose, Casein, gelatin, soy protein, polyethylene imide resin, polyvinyl pyrohydrin resin, polyacrylic acid or copolymers thereof, maleic anhydride copolymer, acrylamide resin, acrylate resin, polyamide resin, acrylic Resin, styrene-acrylic resin, polyurethane resin, polyester resin, polyvinyl butyral resin, alkyd resin, epoxy resin, epichlorohydrin resin, urea resin , Melamine resin, styrene-butadiene copolymer, methyl methacrylate-butadiene copolymer, acrylic polymer latex, acrylic polymer latex such as methacrylic acid ester polymer or copolymer, ethylene-vinyl acetate copolymer Examples thereof include vinyl polymer latexes such as, composite resins of colloidal silica and acrylic resins, and composite resins of colloidal silica and styrene-acrylic resins, which are used alone or in combination. Polyvinyl alcohol is preferably contained from the viewpoint of achieving both ink absorbability and excellent gloss. The amount of the binder used is determined in consideration of the printability of the recording medium, the strength of the glossy layer, the surface glossiness, the paint liquid property, and the like. Usually, it adds in 1-100 mass parts with respect to the pigment mass in a glossiness expression layer. Preferably, it is added in the range of about 5 to 50 parts by mass. More preferably, it is 10-50 mass parts. If it is less than 1 part by mass, the coating layer strength may decrease. If it exceeds 100 parts by mass, the ink absorbability may decrease.

  Furthermore, in the present invention, it is preferable that the glossy layer contains a cationic polymer from the viewpoint of the water resistance of the printed portion.

  Further, the glossy layer includes a release agent, a dispersant, a thickener, an antiseptic, an antifoaming agent, a coloring dye, a coloring pigment, a fluorescent brightening agent, a water-resistant agent, a wetting agent, an antioxidant, an ultraviolet ray. An additive such as an absorbent can be appropriately selected and added.

As a coating method of the coating liquid for forming the glossy layer, a known coating machine such as an air knife, a roll coater, a reverse roll coater, a bar coater, a comma coater or a blade coater is used. Amount of coating is, 3 to 20 g / ^{m 2} in terms of solid content, preferably in the range of 5 to 15 g / ^{m 2.} When the coating amount exceeds 20 g / m ² , the productivity is inferior, and when the coating amount is less than 3 g / m ² , it is difficult to form a sufficiently glossy surface.

  The gloss developing layer is formed by a known cast coating method. As the cast coating method, a wet method, a solidification method, and a rewetting method are known, and in the present invention, the solidification method is preferable. The coagulation method is a method in which the coating liquid for the gloss developing layer is applied and applied to the cast drum after being coagulated by applying the coagulation liquid while it is in a wet state. In the aqueous treatment liquid for coagulation treatment, it is important to select one that effectively coagulates with the binder component of the coating layer, and boron compounds are preferred in the present invention. More preferably, sodium borate or boric acid or both. A high concentration of the coagulating liquid is preferable because the coagulation force is increased and the scratch resistance is further improved. Furthermore, it is more preferable to add a cationic polymer for fixing the ink to the coagulation liquid. The addition amount of the cationic polymer is preferably in the range of 0.1% by mass to 15% by mass in terms of solid content. If it is less than 0.1% by mass, the water resistance of the ink may be inferior, and if it exceeds 15% by mass, the ink absorbability may be inferior. Preferably, it is 0.3 mass%-10 mass%. Further, various releasing agents can be contained in the coagulation liquid.

  In the production method of the present invention, it is essential that a surfactant is contained in the aqueous processing solution for processing the glossy layer. By containing a surfactant, it is possible to reduce the surface tension of the aqueous treatment liquid for treating the glossy layer, and it is possible to suppress repellency after application of the aqueous treatment liquid. In order to suppress both repelling and foaming of the aqueous treatment liquid, the surfactant contained in the aqueous treatment liquid contains a silicone surfactant or a fluorine surfactant or both of them. It is essential. When the surfactant contained in the aqueous treatment liquid is only a surfactant of a type other than a silicone surfactant or a fluorosurfactant, for example, when it is only an aliphatic hydrocarbon surfactant, It is difficult to suppress both repellency and bubbling of the aqueous processing liquid, which may reduce production efficiency.

  Moreover, it is preferable that the range of the surface tension of the said aqueous processing liquid for glossy expression layer processing is 25-55 mN / m. If the surface tension of the aqueous treatment liquid is less than 25 mN / m, production efficiency may be reduced due to the harmful effects of foaming. Moreover, when it exceeds 55 mN / m, there exists a possibility that repellency may generate | occur | produce after application | coating of this aqueous processing liquid, and production efficiency may fall. More preferably, it is 28-50 mN / m. The surface tension value of the present invention was measured using a Dunoi surface tension meter manufactured by Ohira Rika Kogyo Co., Ltd. under the condition of a liquid temperature of 23 ° C. Further, even in the case of surfactants other than silicone surfactants or fluorosurfactants, for example, surfactants such as aliphatic hydrocarbons and derivatives thereof, as long as the effects of the present invention are not impaired, It is also possible to add appropriately to the silicone-based surfactant, to the fluorine-based surfactant, or to both of them.

  In addition, the time from application of the coating liquid for the glossy layer to the application of the aqueous treatment liquid, the time from application of the aqueous treatment liquid to the arrival of the cast drum, the cast drum temperature, the pressure at the time of pressure contact, and the line By adjusting the speed, a glossy layer having a high glossiness can be formed. These various conditions need to be optimized by obtaining optimum conditions according to the equipment and paint used.

  In addition, calendering such as machine calender, soft calender, super calender, etc. may be performed after cast coating treatment, and for curling adjustment, water, curling adjuster, etc. are applied to the back side and humidified to adjust curling. Can also be done.

  In the glossy paper for ink-jet recording according to this embodiment, the ink receiving layer and the gloss developing layer are provided on one side of the substrate. However, in the case of duplex printing, the ink receiving layer and the gloss developing layer are provided on both sides of the substrate. May be.

  EXAMPLES Hereinafter, although an Example is given and this invention is further explained in full detail, this invention is not limited to these examples. Further, “parts” and “%” shown in the examples represent solid mass parts and solid mass% unless otherwise specified.

Example 1:
As a base material, 100 parts of L-BKP (hardwood bleached kraft pulp) beaten to 530 ml of Canadian Standard Freeness (CSF), and 5 parts of talc (trade name: T Light 83, manufactured by Taihei Talc Co., Ltd.) as an internal filler Further, 3% sulfuric acid band, rosin sizing agent (trade name: AL-120, manufactured by Seiko PMC) 0.25 part, cationized starch (trade name: Mermaid C-50, manufactured by Shikishima Starch Co.) 1.0 After adding and preparing parts, the paper was surface-treated with oxidized starch to produce a high-quality paper having a basis weight of 180 g / m ² . On one side of this fine paper, 100 parts by mass of synthetic silica (Mizukasil P-78A, manufactured by Mizusawa Chemical Co., Ltd.), 10 parts by mass of polyvinyl alcohol (PVA117: manufactured by Kuraray Co., Ltd.) as a binder, ethylene-vinyl acetate (Polysol EVA AD) -10: Showa Polymer Co., Ltd.) 40 parts by mass and cationic polymer (Papiogen P-103: manufactured by Senka Co., Ltd.) 30 parts by mass, a coating solution having a solid content concentration of 22% is completely dry-coated with an air knife coater. The ink receiving layer was applied by applying and drying so that the work amount was 12 g / m ² . Subsequently, spherical colloidal silica (SYLOJET 4000A, average primary particle size 30 to 40 nm: manufactured by Grace Devison Co., Ltd.) 100 parts by mass as a pigment for the glossy layer coating material, and an acrylic resin emulsion (Rikabond ES-63: manufactured by Chuo Rika Kogyo Co., Ltd.) as a binder. ) 10 parts by mass, 5 parts by mass of polyvinyl alcohol (PVA-205: manufactured by Kuraray Co., Ltd.), and 5 parts by mass of polyethylene emulsion (SN coat 287: manufactured by San Nopco) as a release agent. Obtained. This coating solution was applied onto the ink receiving layer with an air knife coater so that the dry coating amount was 10 g / m ^2, and then, as a coagulation solution, sodium borate 1%, cationic polymer (PAS-J -81: Nittobo Co., Ltd.) 1%, silicone-based surfactant (Paintad 32: manufactured by Toray Dow Corning Co., Ltd.) 0.04% was applied while the glossy layer was wet. After the coagulation treatment was performed, while the surface of the obtained coating layer was wet, it was pressure-bonded to a cast drum having a surface temperature of 105 ° C. to produce glossy paper for ink jet recording. The surface tension of the coagulating liquid (aqueous processing liquid) at this time was 32 mN / m.

Example 2:
In Example 1, as a coagulation solution, sodium borate 1%, boric acid 1%, cationic polymer (PAS-J-81: manufactured by Nittobo Co., Ltd.) 1%, silicone surfactant (SN wet 123: San Nopco) Glossy paper for ink-jet recording was produced under the same conditions as described in Example 1 except that 0.04% was used as an aqueous treatment solution. The surface tension of the coagulating liquid (aqueous processing liquid) at this time was 25 mN / m.

Example 3:
In Example 1, as a coagulation liquid, sodium borate 1%, cationic polymer (PAS-J-81: manufactured by Nittobo) 1%, silicone surfactant (SN wet 125: manufactured by San Nopco) 0. Glossy paper for ink-jet recording was prepared under the same conditions as described in Example 1 except that the aqueous treatment liquid was mixed with 001%. The surface tension of the coagulating liquid (aqueous processing liquid) at this time was 55 mN / m.

Example 4:
As a glossy layer coating, the pigment is a BET specific surface area of 55 m ² / g of alumina (PG-003, crystal form-γ, θ mixture: manufactured by CABOT, average particle size 150 nm), 50 parts by mass, gas phase method silica (Leosil QS). -102: 50 parts by mass of Tokuyama Co., Ltd., average particle size 160 nm), 10 parts by mass of a cationic polymer (Papiogen P-103: Senka), and acrylic resin emulsion (Vinyl Blanc 2687: Nissin Chemical Industry) as a binder 10 parts by mass, 5 parts by mass of polyvinyl alcohol (PVA-205: manufactured by Kuraray Co., Ltd.), 5 parts by mass of polyethylene emulsion (SN coat 287: manufactured by San Nopco) as a release agent, and sodium borate 1 as a coagulation liquid %, Water-based treatment containing 0.004% of silicone surfactant (SN wet 125: manufactured by San Nopco) Except that the was prepared for ink jet recording glossy paper in conditions as described in Example 1. The surface tension of the coagulating liquid (aqueous processing liquid) at this time was 47 mN / m.

Example 5:
In Example 4, glossy paper for inkjet recording was produced under the same conditions as described in Example 4 except that the coated glossy expression layer was dried and then an aqueous treatment liquid was applied and pressure-bonded to the cast drum. .

Example 6:
In Example 1, as a coagulation liquid, sodium borate 1%, cationic polymer (PAS-J-81: manufactured by Nittobo Co., Ltd.) 1%, fluorosurfactant (Surflon S132: manufactured by Seimi Chemical Co.) Glossy paper for ink-jet recording was produced under the same conditions as described in Example 1 except that the aqueous treatment liquid was formulated with 04%. The surface tension of the coagulating liquid (aqueous processing liquid) at this time was 26 mN / m.

Example 7:
In Example 1, as a coagulation solution, sodium borate 1%, cationic polymer (PAS-J-81: manufactured by Nittobo Co., Ltd.) 1%, silicone surfactant (Paintad 32: manufactured by Toray Dow Corning Co.) A glossy paper for ink-jet recording was prepared under the same conditions as described in Example 1 except that the aqueous treatment liquid was formulated with 02% and 0.02% of a fluorosurfactant (Surflon S132: manufactured by Seimi Chemical Co., Ltd.). . The surface tension of the coagulating liquid (aqueous processing liquid) at this time was 29 mN / m.

Comparative Example 1:
In Example 1, glossy paper for ink-jet recording was produced under the same conditions as described in Example 1 except that the surfactant was not added as the coagulation liquid. The surface tension of the coagulating liquid (aqueous processing liquid) at this time was 60 mN / m.

Comparative Example 2:
In Example 1, as a coagulation liquid, sodium borate 1%, cationic polymer (PAS-J-81: manufactured by Nittobo Co., Ltd.) 1%, hydrocarbon surfactant (Orphine E1004: manufactured by Nisshin Chemical Industry Co., Ltd.) ) A glossy paper for ink-jet recording was prepared under the same conditions as described in Example 1 except that the aqueous treatment liquid was mixed with 0.08%. The surface tension of the coagulating liquid (aqueous processing liquid) at this time was 39 mN / m.

Comparative Example 3:
In Example 1, as a coagulating liquid, sodium borate 1%, cationic polymer (PAS-J-81: manufactured by Nittobo Co., Ltd.) 1%, hydrocarbon surfactant (Surfinol SE: Nissin Chemical Industry Co., Ltd.) (Product made) Glossy paper for inkjet recording was produced on condition as described in Example 1 except having set it as the aqueous processing liquid which mix | blended 0.08%. The surface tension of the coagulating liquid (aqueous processing liquid) at this time was 40 mN / m.

Comparative Example 4:
In Example 1, as a coagulation liquid, sodium borate 1%, cationic polymer (PAS-J-81: manufactured by Nittobo Co., Ltd.) 1%, hydrocarbon-based surfactant (Leocor SC-70: manufactured by Lion Corporation) Glossy paper for inkjet recording was produced under the same conditions as described in Example 1 except that the aqueous treatment liquid was mixed with 0.01%. The surface tension of the coagulating liquid (aqueous processing liquid) at this time was 40 mN / m.

  The obtained glossy paper for ink-jet recording was subjected to the following test, and the results are shown in Table 1.

(1) Experience:
In order to confirm the influence of the glossy layer on the repellency of the aqueous treatment liquid, the glossy surface of the glossy paper for ink jet recording was visually evaluated.
(Double-circle): There is no trace of repellency at the time of processing liquid application, glossiness is uniform, and it is practical.
○: Although there is a small repellency when the treatment liquid is applied, the glossiness after drying is uniform and practical.
(Triangle | delta): The trace of repelling remains on a glossy surface, and there exists a part with a non-uniform glossiness, and there exists a problem practically.
X: Many cissing marks remain on the glossy surface, the glossiness is non-uniform, and impractical.

(2) Foaming of aqueous treatment liquid for glossy layer:
The influence on the continuous operability by the foaming of the application part of the aqueous treatment liquid of the glossy layer was evaluated.
A: There is no foaming.
○: Slight bubbling occurs but does not affect continuous operability.
Δ: A level causing a problem that foaming may cause defects on the glossy surface.
X: Foaming was very large, and treatment liquid supply failure (liquid running out) occurred. It is impossible for practical use.

(3) Image clarity of the surface of the glossy layer:
In order to evaluate the specularity of the glossy layer surface of the obtained ink jet recording paper, image clarity was measured. The image clarity is in accordance with JIS H 8686-2 "Image quality test method for anodized films of aluminum and aluminum alloys-Part 2: Instrument measurement method" with an optical comb width of 2 mm and an incident / reflection angle of 60 °. Measured with a sexometer (ICM-1T: manufactured by Suga Test Instruments Co., Ltd.). As an evaluation, when the image clarity is 50% or more, the reflected image is clearly visible and the glossiness is excellent. If it is less than 50%, the reflected image is unclear and inferior in gloss (practically problematic).

(4) Image clarity:
Ink jet obtained using an ISO standard image (ISO / JIS-SCID high-definition color digital standard image data, image name: portrait, image identification number: N1) using a Seiko Epson inkjet printer “PM-900C” Printed on recording paper. The printed image was visually evaluated.
(Double-circle): The recorded image is very clear and contrast is clear, and it can be used practically.
○: The recorded image is clear and the contrast is clear, and can be used practically.
(Triangle | delta): The recorded image is clear, but contrast is not clear, the color is sinking, and there exists a problem in practical use.
X: The recorded image is unclear and the color is sinking, impractical.

(5) Ink absorbability:
Using an ink jet printer “PM-900C” manufactured by Seiko Epson, each ink of CMYK and solid (100% density) of RGB (Red-Green-Blue) and characters were printed on the obtained ink jet recording paper. The boundary of each color of the solid part and the degree of blurring of the characters were evaluated visually.
(Double-circle): A boundary is clear, there is no blur, a character is clear, and it can be used practically.
○: The blur of the boundary is not conspicuous, the characters are clear, and can be used practically.
(Triangle | delta): The blur of a boundary is conspicuous, a character is unclear, and there exists a problem practically.
X: The blurring of the boundary is severe, and the characters cannot be distinguished, so that it is not practical.

  As apparent from Table 1, at least one ink receiving layer is provided on at least one side of the substrate, and a gloss developing layer containing a pigment and a binder is provided on the ink receiving layer, and the gloss developing layer is provided. However, after applying the coating liquid for the gloss developing layer and providing the coating layer, an aqueous treatment liquid is applied on the coating layer, and the wet coating layer is pressed against the heated mirror surface. A method for producing a cast-coated paper formed by a cast coating method, wherein an aqueous treatment liquid containing one or both of a silicone-based surfactant and a fluorosurfactant is used as the aqueous treatment liquid. It turned out that the used Examples 1-7 are excellent in printing performance and glossiness compared with Comparative Examples 1-4, and are excellent in continuous operativity.

In Comparative Example 1, the surfactant was not added to the coagulating liquid (aqueous processing liquid) of the glossy layer, so that repelling occurred and the glossy surface was inferior. In Comparative Examples 2 to 4, since the surfactant of the aqueous treatment liquid was only the addition of a surfactant other than the silicone surfactant and the fluorosurfactant, the effect of suppressing repelling and foaming was inferior, and continuous operability Also inferior.

Claims (8)

One or more ink receiving layers are provided on at least one side of the substrate, and a gloss developing layer containing a pigment and a binder is provided on the ink receiving layer, and the gloss developing layer is coated with a gloss developing layer. After forming the coating layer by coating the liquid, an aqueous treatment liquid was applied onto the coating layer, and the coating layer in a wet state was formed by a cast coating method in pressure contact with a heated mirror surface. A method for producing cast coated paper, comprising:
A method for producing glossy paper for ink-jet recording, comprising using, as the aqueous treatment liquid, an aqueous treatment liquid containing one or both of a silicone-based surfactant and a fluorine-based surfactant.   2. The method for producing glossy paper for ink jet recording according to claim 1, wherein the surface tension of the aqueous treatment liquid is in the range of 25 to 55 mN / m.   After the cast coating method applied the glossy layer coating liquid and provided a coating layer, an aqueous treatment liquid containing a coagulant was applied while the coating layer was in a wet state. 3. The method for producing glossy paper for ink-jet recording according to claim 1, wherein the coating layer in a wet state is pressed against a heated mirror surface later.   4. The method for producing glossy paper for ink-jet recording according to claim 1, wherein the binder for the glossy layer contains polyvinyl alcohol.   The method for producing glossy paper for ink jet recording according to claim 3 or 4, wherein the aqueous processing liquid contains a boron compound as the coagulant.   6. The method for producing glossy paper for ink jet recording according to claim 1, wherein the aqueous processing liquid contains a cationic polymer.   The pigment of the glossy layer is alumina having an average particle size of 500 nm or less, silica having an average particle size of 500 nm or less, or both, 6. A method for producing glossy paper for ink jet recording according to item 6. A glossy paper for ink-jet recording produced by the method for producing a glossy paper for ink-jet recording according to any one of claims 1 to 7.