JP2016112765A - Inkjet recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inkjet recording medium having printing suitability (ink absorbency and color developing properties) with a dye ink and a pigment ink and having further improved white paper face feeling with less contamination of coating aggregates acting as foreign substances in an ink receiving layer.SOLUTION: There is provided an inkjet recording medium which is obtained by providing an ink receiving layer containing a pigment and a binder on at least one surface of a support, followed by subjecting to calender treatment, where the ink receiving layer contains a lubricant, a surfactant and a water-soluble metal salt.SELECTED DRAWING: None

Description

  The present invention relates to an inkjet recording medium.

  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 inkjet printers, inks, and recording media. As a medium dedicated for ink jet recording, a medium having a pigment coating layer mainly composed of a pigment and a binder (so-called void-type medium) or a resin coating layer not containing a pigment with paper and / or film as a support. A medium (so-called swellable medium) provided with a surface on the surface is often used.

  On the other hand, as ink for inkjet printers, not only dye inks using dye colorants, which have been the mainstream in the past, but also pigment inks in which colored pigments with excellent storage stability such as water resistance and light resistance are used are used. It has become. Since the absorption speed of the pigment ink is slower than that of the dye ink, the ink receiving layer requires pores of an appropriate size, and even the ink receiving layer excellent in dye ink suitability has poor pigment ink absorbability and poor color development. Often to do.

  Inkjet printer technology has been used not only in personal printers used at home, but also in fields such as commercial printing in which variable information is digitized and printed at high speed. That is, in recent years, in the field of commercial printing, a so-called on-demand printing method is being introduced, and many ink jet printers adopting the on-demand printing method have also appeared. This on-demand printing method is suitable for printing a small number of copies because information can be directly printed on a medium such as paper without making a plate.

  Not only personal printers but also ink jet printers that employ an on-demand printing method can use dye ink and pigment ink depending on the application. As described above, since both inks have different properties, it is not easy to design an ink receiving layer that can print both inks satisfactorily. However, it is extremely uneconomical for users of various ink jet printers to separately supply media having ink receiving layers suitable for both inks. In order to meet the demands of these users, a simple means for designing an ink receiving layer that does not require a major change in the basic design of the conventional ink receiving layer is required.

  As such an ink jet recording medium, Patent Document 1 discloses that an ink receiving layer containing a pigment and a styrene butadiene latex contains a cationic substance and a lubricant, thereby causing stains in the calendar process. In addition, it has been proposed to suppress the deterioration of the blank paper surface, and to make an ink jet printing paper with high print quality while maintaining the same texture as a general printing coated paper.

  However, the technique described in Patent Document 1 can reduce contamination in the calendar process, and can obtain an ink jet printing paper having good printing quality with dye ink and printing quality with pigment ink. In some cases, the surface quality of the coating layer (hereinafter also referred to as white paper surface texture) may be impaired in the final product of inkjet printing paper due to aggregates generated in the coating liquid.

JP2014-205270A

  Accordingly, an object of the present invention relates to an ink jet recording medium, has printability with dye inks and pigment inks (ink absorbability and color developability), is less contaminated with paint aggregates as foreign matters in the ink receiving layer, and is white. An object of the present invention is to provide an ink jet recording medium having a further improved paper feeling.

  The ink jet recording medium according to the present invention is an ink jet recording medium obtained by providing an ink receiving layer containing a pigment and a binder on at least one surface of a support and calendering the ink receiving layer. Contains a lubricant, a surfactant, and a water-soluble metal salt.

  In the ink jet recording medium according to the present invention, the surfactant is preferably nonionic. Excellent color development of pigment ink.

  In the ink jet recording medium according to the present invention, the water-soluble metal salt is preferably a divalent or higher water-soluble metal salt. Excellent color development of pigment ink.

  The present invention relates to an ink jet recording medium, and can provide a recording medium having printability with dye ink and pigment ink. Furthermore, according to the present invention, it is possible to provide an ink jet recording medium having a good blank surface feeling with less contamination of paint aggregates as foreign matters in the ink receiving layer. The ink jet recording medium of the present invention is particularly suitable as a recording medium for an ink jet printer that employs a personal ink jet printer or an on-demand printing method.

  Next, the present invention will be described in detail with reference to embodiments, but the present invention is not construed as being limited to these descriptions. As long as the effect of the present invention is exhibited, the embodiment may be variously modified.

  As the support used in the present embodiment, a film or paper can be used. Examples of the paper include high quality paper, medium quality paper, and white paperboard. Either acidic paper or neutral paper can be used. Pulp fibers used for paper (base paper) in this embodiment are chemical pulps such as LBKP (hardwood bleached kraft pulp), NBKP (softwood bleached kraft pulp), GP (crushed wood pulp), PGW (pressurized groundwood pulp), RMP. (Refiner mechanical pulp), TMP (thermomechanical pulp), CTMP (chemithermomechanical pulp), mechanical pulp such as CMP (chemimechanical pulp), CGP (chemiground pulp), wood pulp such as DIP (deinked pulp) and Non-wood pulp such as kenaf, bagasse, bamboo and cotton. These can be used alone or in admixture at any ratio. In addition, a synthetic fiber can be further blended within a range that does not impair the intended effect of the present invention. From the viewpoint of environmental conservation, ECF (Elemental Chlorine Free) pulp or TCF (Totally Chlorine Free) pulp, waste paper pulp, and pulp obtained from afforestation trees are preferable. Moreover, it is preferable that the pulp which comprises the base paper which concerns on this invention is made into the paper stock which has a suitable beating degree as an inkjet printing paper. Suitable beating degree is, for example, Canadian standard freeness (freeness) (JIS P 8121: 1995 “Pulp Freeness Test Method”), 350 to 650 ml CSF. Moreover, it does not specifically limit as a film, For example, polyolefin films, such as a polyethylene film and a polypropylene film, can be used.

  In the paper, known fillers such as heavy calcium carbonate, light calcium carbonate, magnesium carbonate, titanium oxide, synthetic silica, alumina, talc, calcined kaolin clay, kaolin clay, bentonite, zeolite, aluminum hydroxide, zinc oxide, Various paper chemicals such as known paper strength agents, sulfuric acid bands, yield improvers, sizing agents, dyes, and fluorescent dyes may be used as appropriate. The preparation method, blending method, and addition method of each papermaking chemical for each paper stock are not particularly limited as long as the effects of the present invention are not impaired.

In addition, it is possible to make paper using a well-known paper machine such as a circular net paper machine, a long net paper machine, or a twin wire paper machine using a paper material. . Furthermore, it is also possible to mix waste paper with the paper base material as long as the effects of the present invention are not impaired. Furthermore, a known water-soluble polymer such as starch, polyvinyl alcohol, or polyacrylamide is applied to the paper used as the support with a size press or the like in order to suppress excessive penetration of the ink receiving layer coating solution. Can do. Although the basis weight of the paper used as the support is not particularly limited, it is preferably 30 to 300 g / m ^{2 in} consideration of the appropriateness of paper passing to the ink jet printer.

  The ink receiving layer contains a pigment and a binder as in the case of an ink jet recording medium having a general pigment coating layer. The pigment used here is not particularly limited, and known pigments such as silica, alumina, clay, calcium carbonate, talc, and titanium oxide can be used. These may be used alone or in combination of two or more as long as the effects of the present invention are not impaired.

  The binder used in the ink receiving layer is not particularly limited, and for example, polyvinyl alcohol, polyvinyl acetal, starch, carboxymethyl cellulose, casein, gelatin, soy protein, acrylic resin, urethane resin, styrene-acrylic resin, Known binders such as polyester resins, styrene-butadiene copolymer latex, vinyl polymer latexes such as ethylene-vinyl acetate copolymer, and acrylic-silicone resins can be used. These may be used alone or in combination of two or more. Among these binders, it is preferable to use polyvinyl alcohol or styrene-butadiene copolymer latex because it is difficult to generate a paint aggregate described later. The amount of the binder used is not particularly limited, and may be determined in consideration of printability of the recording medium, strength of the ink receiving layer, surface glossiness, coating liquid property, etc., but the pigment 100 in the ink receiving layer may be used. It is preferable that it is the range of 1-100 mass parts with respect to a mass part. More preferably, it is 3-70 mass parts, More preferably, it is 5-60 mass parts, for example, 6-20 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.

  In the ink jet recording medium of the present invention, the ink receiving layer contains a water-soluble metal salt. By containing the water-soluble metal salt, it is possible to suppress the bleeding of the ink-jet ink and obtain an ink-jet recording medium having good printability with the dye ink and the pigment ink. As the water-soluble metal salt, it is preferable to use a divalent or higher-valent water-soluble metal salt because it is excellent in the color developability of the pigment ink. Examples of the divalent or higher water-soluble metal salt include calcium salt, magnesium salt, aluminum salt, strontium salt, barium salt, zirconium salt, titanium salt, and zinc salt. These may be used alone or in combination of two or more. Furthermore, the divalent or higher water-soluble metal salt is more preferably one or more of calcium salt and magnesium salt from the viewpoint of suppression of ink bleeding. In the present invention, the water-soluble metal salt includes a water-soluble metal salt of an inorganic acid such as hydrochloric acid, nitric acid, phosphoric acid and sulfuric acid and a water-soluble metal salt of an organic acid such as formic acid, acetic acid, citric acid and oxalic acid. Is included. The content of the water-soluble metal salt in the ink receiving layer is preferably in the range of 0.1 to 50 parts by mass, more preferably 0.3 to 40 parts by mass with respect to 100 parts by mass of the pigment. Or it is preferable that content of the water-soluble metal salt in an ink receiving layer is 0.05-30 mass% with respect to the dry mass of an ink receiving layer. More preferably, it is 0.1-25 mass%. More preferably, it is 0.5-20 mass%. If it is less than 0.05% by mass relative to the dry mass of the ink receiving layer, there is a possibility that the color developability of the pigment ink is inferior. When it exceeds 30 mass% with respect to the dry mass of an ink receiving layer, there exists a possibility that the coloring property of dye ink may be inferior.

  In the ink jet recording medium of the present invention, in order to obtain a good white paper feeling, a calendar process is performed after an ink receiving layer is provided on the support. However, if the water-soluble metal salt is contained only in the ink receiving layer, the surface of the calendar roll is easily soiled during the calendering process, and defects are generated on the surface of the ink receiving layer, resulting in a blank paper feeling. Will be damaged. Therefore, in the present invention, the ink receiving layer contains a lubricant. By including a lubricant in the ink receiving layer, it is possible to suppress contamination of the surface of the calendar roll when performing the calendar process. Furthermore, the surface of the ink receiving layer becomes slippery and is hardly damaged. The lubricant used here is not particularly limited, and any of a liquid lubricant, a solidified liquid lubricant, and a solid lubricant may be used. The lubricant is preferably added in an amount of 0.04 to 15% by mass, and more preferably 0.07 to 10% by mass with respect to 100 parts by mass of the pigment. Alternatively, the lubricant is preferably added in an amount of 0.005 to 20 mass% with respect to the dry mass of the ink receiving layer. More preferably, it is 0.01-10 mass%. When the amount is less than 0.005% by mass with respect to the dry mass of the ink receiving layer, the effect of suppressing the contamination of the surface of the calendar roll may be poor. When it exceeds 20 mass% with respect to the dry mass of an ink receiving layer, there exists a possibility that the coloring property of a pigment ink may be inferior.

  As the type of lubricant, higher fatty acid salts and / or polyethylene emulsions are preferred. Examples of higher fatty acid salts include laurate, oleate, palmitate, stearate, and myristate (for example, sodium salts, potassium salts, and so-called soaps), and lauric acid. Ammonium, ammonium oleate, ammonium palmitate, ammonium stearate, ammonium myristate. In the present invention, the ink receiving layer preferably contains one or more of laurate, myristate, and oleate as higher fatty acid salts. For example, the higher fatty acid salt is preferably a higher fatty acid salt that is insoluble in water from the viewpoint of maintaining white paper gloss and suppressing soiling on the roll surface of the calendar, and further, an aqueous dispersion of calcium stearate or ammonium stearate. It is more preferable to contain any one or more of them.

  Furthermore, a lubricant made of wax or an organosilicon compound can be used. As waxes, vegetable waxes, animal waxes, montan waxes, paraffin waxes, synthetic waxes (hydrocarbon synthetic waxes, higher fatty acid esters, fatty acid amides, ketones / amines, hydrogenated oils, etc.), polypropylene and polytetrafluoro It can select suitably from aliphatic hydrocarbons, such as ethylene polymer, and its derivative (s). Examples of organosilicon compounds include polyalkylsiloxanes and derivatives thereof, dimethyl silicone, methylphenyl silicone oil, alkyl modified silicone oil, alkyl / aralkyl modified silicone oil, amino modified silicone oil, polyether modified silicone oil, higher fatty acid modified silicone oil, It can be appropriately selected from low-molecular and high-molecular silicone oils such as carboalkyl-modified silicone oil, fluorine-modified silicone oil, and epoxy-modified silicone oil, and silicone rubber.

  As described above, in the ink jet recording medium of the present invention, the ink receiving layer contains the water-soluble metal salt and the lubricant, but the ink-receiving layer paint containing the water-soluble metal salt and the lubricant is prepared. Then, although the reason is not clear, the stability with time of the paint is impaired, and even if the contamination of the roll surface in the calendar process is suppressed, agglomerates may be generated in the paint over time. When aggregates are generated in the coating material, foreign matters are finally mixed in the ink receiving layer, and as a result, the blank surface feeling of the final product of the inkjet recording medium is impaired.

  Therefore, in the present invention, the ink receiving layer contains a surfactant together with the water-soluble metal salt and the lubricant. By containing the surfactant, the above-mentioned stability of the coating material with time can be improved, and the generation of aggregates in the coating material can be suppressed. Examples of the surfactant used here include acetylene glycol surfactants, perfluoroalkyl surfactants, polyoxyethylene surfactants, and silicone surfactants. These may be used alone or in combination of two or more. The content of the surfactant is preferably in the range of 0.04 to 10 parts by mass, more preferably 0.05 to 7 parts by mass with respect to 100 parts by mass of the pigment. Or it is preferable that content of surfactant is 0.005-5 mass% with respect to the dry mass of an ink receiving layer. More preferably, it is 0.01-3 mass%. If it is less than 0.005% by mass relative to the dry mass of the ink receiving layer, the effect of suppressing the formation of aggregates in the paint may be poor. When the amount exceeds 5% by weight based on the dry weight of the ink receiving layer, the color developability of the dye ink may be inferior. Further, the surfactant is preferably a nonionic surfactant because it is excellent in the color developability of the pigment ink and more excellent in the effect of suppressing the generation of aggregates in the paint.

  The ink receiving layer can contain a cationic polymer as an ink fixing agent. The color developability of the dye ink can be further improved. Cationic polymers include, for example, polyethyleneimine, epichlorohydrin-modified polyalkylamine, polyamine, polyamine polyamide epichlorohydrin, dimethylamine ammonia epichlorohydrin, polyvinylbenzyltrimethylammonium halide, polydiacryldimethylammonium halide, polydimethylaminoethyl methacrylate hydrochloride, Palladium halide, cationic polyacrylamide, cationic polystyrene copolymer, diallyldimethylammonium chloride polymer, diallyldimethylammonium chloride sulfur dioxide copolymer, diallyldimethylammonium chloride amide copolymer, dicyandiamide formalin polycondensate, dicyandiamide diethylenetriamine heavy Condensate, polyant Amine, polydiallylamine, polyallylamine hydrochloride, polyacrylamide resin, polyamide epoxy resin, melamine resin acid colloid, urea resin, cation-modified polyvinyl alcohol, amino acid type amphoteric surfactant, betaine type compound, polyamidine compound, etc. Quaternary ammonium salts, cation-modified polyurethane resins. These may be used alone or in combination of two or more. In the present embodiment, the content of the cationic polymer is preferably 0.05 to 20% by mass with respect to the dry mass of the ink receiving layer. More preferably, it is 0.5-15 mass%.

  In the ink receiving layer, auxiliary agents such as dispersants, thickeners, preservatives, antifoaming agents, coloring dyes, coloring pigments, fluorescent whitening agents, water-proofing agents, antioxidants, and UV absorbers are appropriately added. Can be selected and blended.

  In the ink jet recording medium of the present invention, an ink receiving layer is provided on at least one surface of the support. The ink receiving layer can be obtained by applying the ink receiving layer coating material to the support and then drying. As a coating method of the coating liquid for forming the ink receiving layer, there are known coating machines such as an air knife coater, roll coater, reverse roll coater, bar coater, comma coater, blade coater, and simultaneous multilayer coater. However, any of them may be used.

The coating amount (absolute dry mass) of the ink receiving layer is preferably ³ to 30 g / m ² per side. More preferably, it is 4-25 g / m < ² >, More preferably, it is 5-20 g / m < ² >. If it is less than 3 g / m ² , the ink absorbability may be inferior. If it exceeds 30 g / m ² , the mechanical strength of the coated surface may be insufficient.

  After coating the ink receiving layer, it performs a calendar process such as a machine calendar, a soft calendar, and a super calendar, and performs a smoothing process. In this case, processing can be performed by appropriately adjusting processing conditions such as the configuration of the pressure device, the number of pressure nips, and temperature conditions. For example, it is good to perform a calendar process on the conditions of temperature 30-100 degreeC and a calendar line pressure of 50-200 kg / cm.

  In the ink jet recording medium of the present invention, it is also possible to provide one or more undercoat layers mainly composed of a white pigment and a binder between the ink receiving layer and the support. It can be set as the ink jet recording medium which is excellent in the absorptivity of dye ink and pigment ink.

There are known coating machines such as an air knife, a roll coater, a bar coater, a comma coater, a blade coater, and a simultaneous multi-layer coating machine as the coating method for forming the undercoat layer. The coating amount (absolute dry mass) of the undercoat layer that may be used is not particularly limited, but if the coating amount is too small, the ink absorbability may be inferior, so that it is 5 g / per side in terms of solid content. m ² or more is preferable. Further, if the coating amount is too large, binder migration may occur when the ink receiving layer is applied on the undercoat layer, and the strength of the ink receiving layer may be reduced. Therefore, the amount is preferably 30 g / m ² or less per side. . The coating amount of the undercoat layer is more preferably 6 to 25 g / ^{m 2,} more preferably from 7~20g / ^{m 2.}

  Next, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples. In the examples, “parts” and “%” represent “parts by mass” and “mass%”, respectively, unless otherwise specified. The number of added parts is a value in terms of solid content.

Example 1
(Formation of support)
For 100 parts of hardwood bleached kraft pulp (Canada standard freeness 530 ml CSF) dispersed in water, 0.25 parts of cationized starch (Neotac 30T: manufactured by Nippon Food Processing Co., Ltd.), 0.20 parts of acidic rosin sizing agent, Then, 0.5 parts of liquid sulfuric acid band and talc (talc NTL: manufactured by Nihon Talc Co., Ltd.) whose addition amount was adjusted so as to have an ash content of 6% were blended to obtain a paper material. This stock was made using a long paper machine to obtain a paper web. Thereafter, oxidized starch (MS # 3800: manufactured by Nippon Food Chemical Co., Ltd.) as a sizing solution was applied on both sides of the paper substrate with a size press so that the dry coating amount was 2.0 g / m ² per side, and a cylinder dryer was used. Dried. Then, the smoothing process was performed using the steel calendar, the high-quality paper (acid paper) of basic weight 100g / m < ² > was manufactured, and it was set as the support body.

(Formation of ink receiving layer)
Subsequently, it was added to 45 parts of kaolin (Contour 1500, manufactured by Imeris Co., Ltd.) and 55 parts of light calcium carbonate (TP-121MS, manufactured by Okutama Kogyo Co., Ltd.) and dispersed in water using a Coreless disperser to prepare a pigment slurry. In this pigment slurry, 2 parts of phosphate esterified starch (MS4600, manufactured by Nippon Food Processing Co., Ltd.), 8 parts of styrene butadiene latex (PA0372, Nippon A & L Co., Ltd.) as a binder, 5 divalent water-soluble metal salt (magnesium chloride) 5 Part by weight, 0.5 part by weight of a nonionic polyoxyethylene-based surfactant (Leocor TD-90D: manufactured by Lion Corporation), calcium stearate lubricant (DEF-963TF, Nisshin Chemical Laboratory) which is a water-insoluble higher fatty acid salt 1.5 parts by mass) was obtained, and an ink receiving layer coating liquid having a solid content concentration of 50% by mass was obtained. Subsequently, the ink receiving layer coating solution was applied and dried on both sides of the support obtained above using a blade coater so that the dry coating mass per side was 8 g / m ² . Thereafter, calendar treatment (temperature 30 ° C., linear pressure 80 kg / cm) was performed to produce an ink jet recording medium. At this time, the total content of the water-soluble metal salt with respect to the total mass of the ink receiving layer is 4.3%, the total content of the surfactant is 0.43%, and the total content of the lubricant is 1. 3%.

(Example 2)
An ink jet recording medium was produced in the same manner as in Example 1, except that the amount of the water-soluble metal salt added was 30 parts by mass. At this time, the total content of the water-soluble metal salt with respect to the total mass of the ink receiving layer is 21%, the total content of the surfactant is 0.35%, and the total content of the lubricant is 1.1. %Met.

(Example 3)
An ink jet recording medium was prepared in the same manner as in Example 1, except that the amount of the water-soluble metal salt added was 0.5 parts by mass. At this time, the total content of the water-soluble metal salt with respect to the total mass of the ink receiving layer is 0.44%, the total content of the surfactant is 0.44%, and the total content of the lubricant is 1. 3%.

Example 4
An ink jet recording medium was produced in the same manner as in Example 1 except that the addition amount of the surfactant was 0.1 part by mass in Example 1. At this time, the total content of the water-soluble metal salt with respect to the total mass of the ink receiving layer is 4.3%, the total content of the surfactant is 0.086%, and the total content of the lubricant is 1. 3%.

(Example 5)
An ink jet recording medium was produced in the same manner as in Example 1 except that the addition amount of the surfactant in Example 1 was changed to 5 parts by mass. At this time, the total content of the water-soluble metal salt with respect to the total mass of the ink receiving layer is 4.1%, the total content of the surfactant is 4.1%, and the total content of the lubricant is 1. 2%.

(Example 6)
An ink jet recording medium was prepared in the same manner as in Example 1 except that the amount of lubricant added was 10 parts by mass in Example 1. At this time, the total content of the water-soluble metal salt with respect to the total mass of the ink receiving layer is 4.0%, the total content of the surfactant is 0.40%, and the total content of the lubricant is 8%. 0.0%.

(Example 7)
An ink jet recording medium was produced in the same manner as in Example 1 except that the amount of lubricant added was 0.1 parts by mass in Example 1. At this time, the total content of the water-soluble metal salt with respect to the total mass of the ink receiving layer is 4.3%, the total content of the surfactant is 0.43%, and the total content of the lubricant is 0. 0.087%.

(Example 8)
An ink jet recording medium was produced in the same manner as in Example 1 except that the water-soluble metal salt in Example 1 was changed to magnesium sulfate, which is a divalent water-soluble metal salt. At this time, the total content of the water-soluble metal salt with respect to the total mass of the ink receiving layer is 4.3%, the total content of the surfactant is 0.43%, and the total content of the lubricant is 1. 3%.

Example 9
An ink jet recording medium was prepared in the same manner as in Example 1, except that the water-soluble metal salt in Example 1 was changed to calcium chloride, which is a divalent water-soluble metal salt. At this time, the total content of the water-soluble metal salt with respect to the total mass of the ink receiving layer is 4.3%, the total content of the surfactant is 0.43%, and the total content of the lubricant is 1. 3%.

(Example 10)
An ink jet recording medium was prepared in the same manner as in Example 1 except that the water-soluble metal salt in Example 1 was changed to aluminum chloride, which is a trivalent water-soluble metal salt. At this time, the total content of the water-soluble metal salt with respect to the total mass of the ink receiving layer is 4.3%, the total content of the surfactant is 0.43%, and the total content of the lubricant is 1. 3%.

(Example 11)
An ink jet recording medium was prepared in the same manner as in Example 1 except that the surfactant was changed to a nonionic acetylene glycol surfactant (Olfin PD004, manufactured by Nissin Chemical Industry Co., Ltd.). At this time, the total content of the water-soluble metal salt with respect to the total mass of the ink receiving layer is 4.3%, the total content of the surfactant is 0.43%, and the total content of the lubricant is 1. 3%.

(Example 12)
An ink jet recording medium was prepared in the same manner as in Example 1 except that the surfactant was changed to a nonionic silicone surfactant (Paintad 32, manufactured by Dow Corning Asia Ltd.). At this time, the total content of the water-soluble metal salt with respect to the total mass of the ink receiving layer is 4.3%, the total content of the surfactant is 0.43%, and the total content of the lubricant is 1. 3%.

(Example 13)
A paper substrate was prepared in the same manner as in Example 1. Next, synthetic silica (nip gel AY-601, average particle size 6.0 μm, pore volume 1.6 cm ³ / g, manufactured by Tosoh Silica Co., Ltd.) as a pigment, polyvinyl alcohol (PVA117: manufactured by Kuraray Co., Ltd.) as a binder 5 parts and 35 parts of ethylene-vinyl acetate (Polysol EVA AD-6: Showa High Polymer Co., Ltd.), 10 parts of a cationic polyamidine compound (Himax SC-700M: Hymo Co., Ltd.) as a cationic polymer, 5 parts by weight of water-soluble metal salt (magnesium sulfate), 0.5 parts by weight of nonionic polyoxyethylene-based surfactant (Leocor TD-90D: manufactured by Lion), polyethylene-based lubricant (SN Coat 289, manufactured by San Nopco) 1.5 parts by mass was blended to obtain an ink receiving layer coating solution having a solid content concentration of 25% by mass. Subsequently, this ink receiving layer coating solution was coated and dried on one side of the support with an air knife coater so that the dry coating amount was 6 g / m ² , thereby coating the ink receiving layer. Then, the calendar process was performed and the ink jet recording medium was produced. At this time, the total content of the water-soluble metal salt with respect to the total mass of the ink receiving layer is 3.2%, the total content of the surfactant is 0.32%, and the total content of the lubricant is 0. 96%.

(Example 14)
An ink jet recording medium was prepared in the same manner as in Example 13 except that the water-soluble metal salt was changed to calcium chloride, which is a divalent water-soluble metal salt. At this time, the total content of the water-soluble metal salt with respect to the total mass of the ink receiving layer is 3.2%, the total content of the surfactant is 0.32%, and the total content of the lubricant is 0. 96%.

(Example 15)
An ink jet recording medium was prepared in the same manner as in Example 13 except that the surfactant was changed to a nonionic acetylene glycol surfactant (Olfin PD004, manufactured by Nissin Chemical Industry Co., Ltd.). At this time, the total content of the water-soluble metal salt with respect to the total mass of the ink receiving layer is 3.2%, the total content of the surfactant is 0.32%, and the total content of the lubricant is 0. 96%.

(Example 16)
An ink jet recording medium was prepared in the same manner as in Example 13 except that the support was changed to a polyethylene film in Example 13. At this time, the total content of the water-soluble metal salt with respect to the total mass of the ink receiving layer is 3.2%, the total content of the surfactant is 0.32%, and the total content of the lubricant is 0. 96%.

(Comparative Example 1)
An ink jet recording medium was prepared in the same manner as in Example 1 except that the water-soluble metal salt of the ink receiving layer coating solution was not added. At this time, the total content of the water-soluble metal salt with respect to the total mass of the ink receiving layer is 0%, the total content of the surfactant is 0.45%, and the total content of the lubricant is 1.3. %Met.

(Comparative Example 2)
An ink jet recording medium was prepared in the same manner as in Example 1 except that the lubricant of the ink receiving layer coating solution was not added. At this time, the total content of the water-soluble metal salt with respect to the total mass of the ink receiving layer is 4.3%, the total content of the surfactant is 0.43%, and the total content of the lubricant is 0. %Met.

(Comparative Example 3)
An ink jet recording medium was prepared in the same manner as in Example 1 except that the surfactant of the ink receiving layer forming coating solution was not added. At this time, the total content of the water-soluble metal salt with respect to the total mass of the ink receiving layer is 4.3%, the total content of the surfactant is 0%, and the total content of the lubricant is 1.3%. %Met.

  The obtained ink jet recording medium was subjected to the following test, and the results are shown in Tables 1 to 3.

(1) Color development of dye ink:
ISO standard image (ISO / JIS-SCID high-definition color digital standard image data, image name: portrait, image identification number: N1) using a dye ink dedicated inkjet printer (MFC-J4510N: Brother Industries, Ltd.) The ink jet recording medium thus obtained was printed. The printed image was visually evaluated.
(Double-circle): The recorded image is very clear and contrast is clear, and it can be used practically. Pass.
○: The recorded image is clear and the contrast is clear, and can be used practically. Pass.
Δ: The recorded image is slightly unclear and the contrast is slightly blurred, but it is practical. Pass.
X: The recorded image is extremely unclear, the contrast is extremely blurred, and cannot be used practically. failure.

(2) Color development of pigment ink:
Using an ISO standard image (ISO / JIS-SCID high-definition color digital standard image data, image name: portrait, image identification number: N1) using a pigment ink inkjet printer (CM8060 Color MFP: manufactured by Hewlett-Packard) Printing was performed on the obtained inkjet recording medium. The printed image was visually evaluated.
(Double-circle): The recorded image is very clear and contrast is clear, and it can be used practically. Pass.
○: The recorded image is clear and the contrast is clear, and can be used practically. Pass.
Δ: The recorded image is slightly unclear and the contrast is slightly blurred, but it is practical. Pass.
X: The recorded image is extremely unclear, the contrast is extremely blurred, and cannot be used practically. failure.

(3) Blank paper texture:
The feeling of the blank surface of the ink receiving layer was visually confirmed and evaluated according to the following criteria.
(Double-circle): There is no foreign material and a stain | pollution | contamination, and it is excellent in a blank paper surface feeling, and can be used practically. Pass.
○: Foreign matter and dirt are slightly generated, but it is excellent in blank paper feeling and practical. Pass.
(Triangle | delta): The fault by a foreign material and dirt generate | occur | produces, it is inferior to a blank paper surface feeling, and cannot be used practically. failure.
X: Defects due to foreign matter and dirt are remarkably generated, and the feeling of white paper is extremely inferior. failure.

  As is clear from Tables 1 to 3, the ink jet recording media obtained in Examples 1 to 16 were excellent in the color developability of the dye ink and the pigment ink. Moreover, the blank paper surface was also excellent.

  On the other hand, the ink jet recording medium obtained in Comparative Example 1 was inferior in the color development of the pigment ink because it did not contain a water-soluble metal salt in the ink receiving layer. In addition, the ink jet recording medium obtained in Comparative Example 2 did not contain a lubricant in the ink receiving layer, so that it was soiled during the calendering process and was inferior in white paper feel. Further, the ink jet recording medium obtained in Comparative Example 3 did not contain a surfactant in the ink receiving layer, so that a large amount of foreign matter due to aggregates was mixed in the ink receiving layer, and the blank paper surface was inferior. .

Claims (3)

  An ink jet recording medium obtained by providing an ink-receiving layer containing a pigment and a binder on at least one surface of a support and calendering the ink-receiving layer, wherein the ink-receiving layer comprises a lubricant, a surfactant, and a water-soluble material. An ink jet recording medium comprising a metal salt.   The inkjet recording medium according to claim 1, wherein the surfactant is a nonionic surfactant.   The ink-jet recording medium according to claim 1, wherein the water-soluble metal salt is a divalent or higher water-soluble metal salt.