JP6503217B2 - Glossy paper for inkjet recording - Google Patents

Description

  The present invention relates to glossy paper for inkjet recording.

  The ink jet recording method is a method of recording by forming dots by discharging ink droplets and depositing them on a recording paper. In recent years, technological advances in ink jet printers, inks, and recording media have made it possible to achieve high-quality printing. Glossy paper (so-called void-type glossy paper) having a pigment coating layer mainly composed of a pigment and a binder, using paper and / or film as a support as so-called inkjet glossy paper having glossiness on the recording medium surface Or, glossy paper (so-called swellable glossy paper) provided with a resin coating layer containing no pigment on the surface is often used.

  On the other hand, not only dye inks using dye colorants that have been the mainstream of ink jet inks, but also pigment inks in which color pigments having excellent storage properties such as water resistance and light resistance are dispersed are used for ink jet printer inks It has become. Since the absorption speed of pigment ink is slower than dye ink, the ink receiving layer must have pores of the appropriate size, and even with an ink receiving layer excellent in dye ink suitability, the pigment ink absorbability is poor and color development is deteriorated. There are many things to do.

  In addition, the technology of the ink jet printer is used not only in personal printers for home use but also in fields such as commercial printing where digitalization of variable information is performed 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 inkjet printers adopting the on-demand printing method have appeared. The on-demand printing method is also suitable for printing a small number of copies because it can directly print information on a medium such as paper without making a plate.

  Not only printers for personal use, but also ink jet printers using an on-demand printing method can use dye ink and pigment ink properly depending on applications. As described above, it is not easy to design an ink receiving layer that can print both inks satisfactorily because both inks are different from each other. In particular, in the case of inkjet glossy paper, it is difficult to achieve both. However, separately supplying a medium having an ink receiving layer suitable for both inks separately is extremely uneconomical for the users of various ink jet printers. In order to meet the needs of these users, it is necessary to design a simpler ink receiving layer which does not require significant changes in the basic design of the conventional ink receiving layer.

  As such an inkjet recording paper, there is a proposal to improve the color developability of a pigment ink by incorporating a cationic polymer and an acrylic copolymer in the ink receiving layer (see Patent Document 1).

  However, in the ink jet recording paper described in Patent Document 1, it is difficult to obtain high quality image when printing with dye ink and pigment ink because pigment ink lacks coloring properties, and is required as glossy paper. Not meet the printability.

JP, 2009-51060, A

  Therefore, an object of the present invention relates to glossy paper for inkjet recording, and provides a recording medium which has printability (ink absorbability and color developability) by dye ink and pigment ink and is also excellent in white space feeling and image clarity. It is.

  The glossy paper for ink jet recording according to the present invention is a glossy paper for ink jet recording provided with an ink receiving layer having ink absorbability on at least one surface of a support, wherein the ink receiving layer is interfaced with an anionic lubricant and It contains an activator and a water-soluble metal salt, and the anionic lubricant contains a higher fatty acid salt and an anionic polyethylene emulsion. As a result, it is possible to obtain glossy paper for inkjet recording, which is excellent in the coloring properties of the dye ink and the pigment ink and is also excellent in the feeling of white space and the image clarity.

  In the glossy paper for inkjet recording according to the present invention, the surfactant is preferably nonionic. It is particularly excellent in the feeling of white surface and the color developability of the pigment ink.

  In the glossy paper for inkjet recording according to the present invention, the water-soluble metal salt is preferably a water-soluble metal salt having two or more valences. Particularly excellent in color development of pigment ink.

  The present invention relates to glossy paper for inkjet recording, and can provide glossy paper having excellent printability with dye ink and pigment ink. In particular, it is suitable as glossy paper for inkjet printers for personal use and inkjet printers employing an on-demand printing method.

  EXAMPLES The present invention will next be described in detail by way of embodiments, which should not be construed as limiting the present invention. The embodiment may be variously modified as long as the effects of the present invention are exhibited.

  In the glossy paper for inkjet recording according to the present embodiment, the ink absorbing layer having ink absorbability contains an anionic lubricant, a surfactant and a water-soluble metal salt, and the anionic lubricant is anionic with the higher fatty acid salt. Contains a polyethylene emulsion. As a result, it is possible to provide a glossy recording paper having excellent printability with dye ink and pigment ink.

  In the present invention, the surfactant is preferably a nonionic surfactant. This is because glossy paper for ink jet recording excellent in color development of pigment ink can be obtained. Furthermore, by adding to a paint in which a lubricant and a water-soluble metal salt coexist, the residue and the like of paint aggregates are reduced, the stability with time of the paint is improved, and the feeling of white space and the production efficiency are excellent. In the present embodiment, for example, an acetylene glycol surfactant, a perfluoroalkyl surfactant, a polyoxyethylene surfactant, and a silicone surfactant. One of these may be used alone, or two or more may be used in combination. In the present embodiment, the content of the nonionic surfactant is preferably 0.002 to 6% by mass, and more preferably 0.005 to 5% by mass, with respect to the dry mass of the ink receiving layer. More preferably, it is 0.01 to 3% by mass. If the amount is less than 0.005% by mass, the feeling of white space and the color developability of the pigment ink may be inferior. If it exceeds 5% by mass, the coloring properties of the dye ink may be poor.

  In the present invention, the ink receiving layer contains a water soluble metal salt. By containing a water-soluble metal salt, it is possible to suppress bleeding of the inkjet ink and to obtain glossy paper for inkjet recording which satisfies the printability with the dye ink and the pigment ink. As the water-soluble metal salt, it is preferable to use a water-soluble metal salt having a valence of 2 or more, because the color-forming property of the pigment ink is superior. Examples of the water-soluble metal salt having two or more valences are calcium salt, magnesium salt, aluminum salt, strontium salt, barium salt, zirconium salt, titanium salt and zinc salt. One of these may be used alone, or two or more may be used in combination. Furthermore, it is more preferable from the viewpoint of suppression of ink bleeding that the water-soluble metal salt having a valence of 2 or more is any one or more of a calcium salt and a magnesium salt. In the invention, the water-soluble metal salt is a water-soluble metal salt of an inorganic acid such as hydrochloric acid, nitric acid, phosphoric acid or sulfuric acid and a water-soluble metal salt of an organic acid such as formic acid, acetic acid, citric acid or oxalic acid. Include. Specifically, it is preferable to use magnesium sulfate, magnesium chloride, potassium chloride, aluminum chloride, barium sulfate or the like as the water-soluble metal salt having a valence of 2 or more. In the present embodiment, the content of the water-soluble metal salt is preferably 0.05 to 30% by mass with respect to the dry mass of the ink receiving layer. More preferably, it is 0.1-25 mass%. More preferably, it is 0.5 to 20% by mass, for example, 0.5 to 10% by mass. If it is less than 0.05% by mass, the color developability of the pigment ink may be poor. If it exceeds 30% by mass, the coloring properties of the dye ink may be poor.

  In the present embodiment, the ink receiving layer contains an anionic lubricant, and the lubricant contains a higher fatty acid salt and an anionic polyethylene emulsion. By using a lubricant having such a constitution, the surface of the ink receiving layer becomes appropriately slippery, and at the same time, glossy paper for inkjet recording excellent in the feeling of white space and the image clarity can be obtained. By containing the anionic polyethylene emulsion, it is possible to obtain glossy paper for ink jet recording which is excellent in releasability and is excellent in gloss, particularly in the feeling of white space and image clarity. Here, the anionic lubricant as referred to in the present embodiment refers to a substance which exerts a friction reducing action on the contact portion and which is anionic as an agent. Examples of anionic lubricants include liquid lubricants, solidified products of liquid lubricants, solid lubricants, and the like. As a method of incorporating an anionic lubricant in the ink receiving layer, (1) a method of incorporating it in the coating liquid of the ink receiving layer, (2) coating a treatment liquid containing a lubricant after coating the ink receiving layer There is a way to In the present embodiment, either or both of them may be used. However, the method (2) is more preferable because the surface of the ink receiving layer is further subjected to a friction reducing action.

  Examples of higher fatty acid salts include laurate, oleate, palmitate, stearate, myristate (eg, sodium salts and potassium salts thereof), and ammonium laurate and ammonium oleate , Ammonium palmitate, ammonium stearate, ammonium myristate. In the present embodiment, the ink receiving layer preferably contains at least one of laurate, myristate and oleate as higher fatty acid salts. This is because glossy paper for ink jet recording excellent in the feeling of white space and image clarity can be obtained.

  In the present embodiment, the anionic lubricant is preferably added in an amount of 0.003 to 20% by mass, for example, 0.005 to 10% by mass, with respect to the dry mass of the ink receiving layer. More preferably, it is 0.01-10 mass%. If it is less than 0.005% by mass, the slipperiness of the surface of the ink receiving layer is not suitable. In addition, when the ink receiving layer is subjected to cast coating treatment, the releasability from the casting drum is poor, peeling wrinkles are easily generated, and the image clarity is lowered. When it exceeds 20 mass%, it is inferior to the color development of a pigment ink.

  The higher fatty acid salt is preferably added in an amount of 0.001 to 20% by mass with respect to the dry mass of the ink receiving layer. More preferably, they are 0.05-10 mass% and 0.01-10 mass%. If it is less than 0.005% by mass, the slipperiness of the surface of the ink receiving layer is not suitable. In addition, when a cast coating process is performed on the ink receiving layer, cast drum contamination tends to occur, and image clarity deteriorates. When it exceeds 20 mass%, it is inferior to the color development of a pigment ink. The anionic polyethylene emulsion is preferably added in an amount of 0.001 to 20% by mass, for example, 0.005 to 10% by mass, based on the dry mass of the ink receiving layer. When the amount is less than 0.001% by mass, the slipperiness of the surface of the ink receiving layer is not suitable. In addition, when a cast coating process is performed on the ink receiving layer, cast drum contamination tends to occur, and image clarity deteriorates. When it exceeds 20 mass%, it is inferior to the color development of a pigment ink. More preferably, it is 0.01-10 mass%. The mass ratio of the higher fatty acid salt to the anionic polyethylene emulsion is preferably 99/1 to 1/99. More preferably, it is 95 / 5-5 / 95. Multiple types of higher fatty acid salts and anionic polyethylene emulsions may be used.

  Furthermore, they may be used in combination with the anionic lubricants listed below as long as the effects of the present invention are not impaired. Examples of the type of lubricant according to the present embodiment include waxes and organosilicon compounds. Each lubricant will be described in detail below.

  Waxes include vegetable waxes, animal waxes, montan waxes, paraffin waxes, synthetic waxes (hydrocarbon synthetic waxes, polyethylene emulsion waxes, higher fatty acid esters, fatty acid amides, ketones / amines, hydrogenated hydrogenated oils, etc.), Although it can select suitably from aliphatic hydrocarbons, such as a polypropylene and a polytetrafluoroethylene polymer, and its derivative (s), if it is a range which does not impair the effect of this invention, it will not be specifically limited.

  Examples of organosilicon compounds include polyalkylsiloxanes and derivatives thereof, dimethylsilicone, methylphenylsilicone oils, alkyl-modified silicone oils, alkyl / aralkyl-modified silicone oils, amino-modified silicone oils, polyether-modified silicone oils, higher fatty acid-modified silicone oils, It can be selected appropriately from low molecular weight and high molecular weight silicone oils such as carboxyl modified silicone oil, fluorine modified silicone oil, epoxy modified silicone oil, silicone rubber, etc., as long as the effects of the present invention are not impaired, It is not particularly limited.

  A pigment and a binder may be contained in the ink receiving layer as in the case of glossy paper for inkjet recording having a general pigment coating layer. It does not specifically limit as a pigment used here, It is possible to use well-known pigments, such as a silica, an alumina, a clay, a calcium carbonate, a talc, and a titanium oxide. These may be used alone, or two or more may be used in combination as long as the effects of the present invention are not impaired.

  The binder to be contained in the ink receiving layer is not particularly limited, and, for example, polyvinyl alcohol, silanol modified polyvinyl alcohol, polyvinyl acetal, starch, carboxymethyl cellulose, casein, gelatin, soy protein, acrylic resin, urethane resin, Known binders such as styrene-acrylic resins, polyester resins, styrene-butadiene copolymer latexes, vinyl polymer latexes such as ethylene-vinyl acetate copolymer, acrylic-silicone resins, etc. may be used It is possible. One of these may be used alone, or two or more may be used in combination. The amount of the binder used may be determined in consideration of the printability of glossy paper, the strength of the ink receiving layer, the surface gloss, the coating liquid properties, etc., but 1 to 1 part by weight of the pigment in the ink receiving layer. It is preferably in the range of 100 parts by mass. More preferably, it is 1 to 50 parts by mass, still more preferably 2 to 40 parts by mass, for example, 4 to 10 parts by mass. If the amount is less than 1 part by mass, the strength of the coated layer may decrease. When the amount is more than 100 parts by mass, the ink absorbability may be reduced.

  The ink receiving layer can also contain a cationic polymer as an ink fixing agent. Excellent in color development of dye ink. The cationic polymer includes, for example, polyethyleneimine, epichlorohydrin modified polyalkylamine, polyamine, polyamine polyamide epichlorohydrin, dimethylamine ammonia epichlorohydrin, polyvinylbenzyltrimethylammonium halide, polydiacryldimethylammonium halide, polydimethylaminoethyl methacrylate hydrochloride, polyvinyl pyri Halide, cationic polyacrylamide, cationic polystyrene copolymer, diallyldimethyl ammonium chloride polymer, diallyldimethyl ammonium chloride sulfur dioxide copolymer, diallyl dimethyl ammonium chloride amide copolymer, dicyandiamide formalin polycondensate, dicyandiamide diethylene triamine Condensate, poly ant Amine, polydiallylamine, polyallylamine hydrochloride, polyacrylamide resin, polyamide epoxy resin, melamine resin acid colloid, urea resin, cationically modified polyvinyl alcohol, amino acid type amphoteric surfactant, betaine type compound, polyamidine compound, others 4 Grade ammonium salts, cationically modified polyurethane resins. One of these may be used alone, or two or more may be used in combination. 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%.

  The ink receiving layer may contain, in addition to pigments and binders, auxiliary agents such as dispersants, thickeners, preservatives, antifoaming agents, coloring dyes, coloring pigments, fluorescent whitening agents, water proofing agents, antioxidants, UV absorbers, etc. The agent can be appropriately selected and blended.

  As a coating method of the coating liquid which forms the ink receiving layer of this embodiment, publicly known coating, such as an air knife coater, a roll coater, a reverse roll coater, a bar coater, a comma coater, a blade coater, a simultaneous multilayer coating machine, etc. There is a machine, but any one may be used.

The coating amount (absolute dry mass) of the ink receiving layer is preferably ³ to 30 g / m ² per one 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 absorption may be poor. If it exceeds 30 g / m ² , the mechanical strength of the coated surface may be insufficient.

  Further, as a method of imparting high gloss to the surface of the ink receiving layer, it is preferable that the ink receiving layer is formed by drying by a cast coating method. In addition, after the ink receiving layer is dried, it is possible to carry out a smoothing process by performing a calendar process such as a machine calendar, a soft calendar, and a super calendar.

  The ink receiving layer may be provided on one side or both sides of the support. By providing on both sides, it can be used for double-sided printing. When provided on both sides, the composition of each side may be the same or different.

  In the glossy paper for ink jet recording of the present embodiment, 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 glossy paper for inkjet recording which is excellent by 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 multilayer coating machine as a coating method of the coating liquid for forming the undercoat layer. The coating amount (absolute dry mass) of the undercoat layer which may be used is not particularly limited. However, if the coating amount is too small, the ink absorbability may be poor, so 5 g / solid side in terms of solid content. it is preferable that the m ² or more. If the coating amount is too large, binder migration may occur when the ink receiving layer is coated on the undercoat layer, and the strength of the ink receiving layer may decrease, so 30 g / m ² or less per side preferable. The coating amount of the undercoat layer is more preferably 6 to 25 g / m ² , still more preferably 7 to 20 g / m ² .

  The undercoat layer and / or the intermediate layer may be smoothed by a known calender device such as a super calender, a machine calender, a soft calender or the like in order to obtain a certain level of smoothness after coating.

The total coating amount (absolute dry mass) of all the coating layers on the support is preferably 5 to 40 g / m ² per one side. More preferably, it is 6 to 30 g / m ² . When the total coating amount exceeds 40 g / m ² , productivity is poor. If the total coating amount is less than 5 g / m ² , the absorptivity of the pigment ink may be poor.

  In the glossy paper for ink jet recording according to the present embodiment, it is preferable that the ink receiving layer is formed by drying by a cast coating method as a method of imparting high gloss to the surface of the ink receiving layer. The cast coating method is known as a wet method, a coagulation method and a rewetting method. In the present embodiment, the coagulation method or the re-wetting method is preferable, and the coagulation method is more preferable. The coagulation method is a method in which a coagulation solution is applied and coagulated while the coated layer is in a wet state, and pressed against a heated metal mirror roll (cast drum) to be dried. In the coagulation process, it is important to select a coagulant that can effectively coagulate with the binder component of the ink receiving layer, and in the present embodiment, a boron compound is preferable. More preferably, it is either one or both of sodium borate and boric acid. The concentration of the coagulant in the coagulating solution is preferably in the range of 0.5 to 5% by mass. When the concentration of the coagulating solution is high, the coagulating power is increased and the scratch resistance is further improved, which is preferable. The solid content concentration of the coagulating solution is preferably 1% by mass or more. More preferably, it is 1.5 mass% or more. The upper limit value of the concentration of the coagulating liquid is preferably 10% by mass from the viewpoint of workability and cost. The content of the coagulant is preferably 5% by mass or more with respect to the coagulable binder. If it is less than 5% by mass, the surface strength may be reduced. The content of the coagulant is more preferably 10% by mass or more. The solidifiable binder is the binder of the ink receiving layer. The content of the coagulant is preferably 100 parts by mass or less with respect to 100 parts by mass of the coagulable binder. If it exceeds 100 parts by mass, the coagulant is excessive to the binder, which is uneconomical. Although the coagulation method has been described above, in the present embodiment, the ink receiving layer may be dried by the rewetting method. The rewetting method is a method in which the ink receiving layer is coated and dried, and then the coating layer is wetted with a rewetting liquid and pressed against the casting drum.

A film or paper can be used as a support used in this embodiment. Examples of the paper include high-quality paper, medium-grade paper, and white paperboard. Also, it is possible to use either acid paper or neutral paper. Pulp fibers used for paper (base paper) in the present embodiment are chemical pulp such as LBKP (hardwood kraft pulp), NBKP (softwood kraft pulp), GP (ground pulp), PGW (pressure ground pulp), RMP (Refiner mechanical pulp), TMP (thermomechanical pulp), CTMP (chemothermomechanical pulp), CMP (chemimechanical pulp), mechanical pulp such as CGP (chemi ground pulp), wood pulp such as DIP (deinked pulp) Non-wood pulp such as kenaf, bagasse, bamboo and cotton. These can be used alone or in combination in any proportion. In addition, synthetic fibers can be further blended as long as the effects of the present invention are not impaired. From the viewpoint of environmental conservation, pulp obtained from ECF (Elemental Chlorine Free) pulp or TCF (Totally Chlorine Free) pulp with low environmental impact, waste paper pulp, plantation trees is preferable. Moreover, it is preferable to make the pulp which comprises the base paper which concerns on this invention into the stock which has a freeness suitable as inkjet printing paper. A suitable freeness is, for example, 350 to 650 ml CSF, such as 450 to 600 ml CSF, according to Canadian Standard Freeness (JIS P 8121: 1995 "Test Method for Freeness of Pulp"). Also, the film is not particularly limited, but, for example, a polyolefin film such as a polyethylene film or 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, etc. Various paper making chemicals such as known paper strengthening agents, sulfuric acid bands, retention aids, sizing agents, dyes, fluorescent dyes and the like may be used appropriately. The method for preparing each stock, the method for blending, and the method for adding each paper making chemical 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 stock by applying a known paper making machine such as a cylinder paper machine, a fourdrinier paper machine, a twin wire paper machine, etc. Either single layer paper or multilayer paper may be used. . Furthermore, it is also possible to blend waste paper as long as the effects of the present invention are not impaired. Furthermore, in order to suppress excessive penetration of the coating liquid for the ink receiving layer, a known water-soluble polymer such as starch, polyvinyl alcohol, polyacrylamide or the like should be applied to the paper serving as the support with a size press or the like. Can. Although the basis weight of the paper used as a support is not particularly limited, it is preferably 30 to 300 g / m ^{2 in} consideration of the sheet passing suitability to an ink jet printer.

  EXAMPLES The present invention will next be described in more detail by way of examples, which should not be construed as limiting the invention thereto. Moreover, unless otherwise indicated, "part" and "%" in an example show a "mass part" and "mass%", respectively. In addition, the addition part number is a value of solid content conversion.

Example 1
(Formation of support)
To 100 parts of hardwood bleached kraft pulp (Canadian standard freeness 530 ml CSF) dispersed in water, 0.25 parts of cationized starch (Neotac 30T: manufactured by Japan Food Processing Co., Ltd.) and 0.20 parts of acid rosin sizing agent A stock was obtained by blending 0.5 parts of a liquid sulfuric acid band and talc (talc NTL: manufactured by Nippon Talc Co., Ltd.) whose addition amount was adjusted to have an ash content of 6%. This stock was formed into a paper by means of a Fourdrinier paper machine to obtain a web. Thereafter, oxidized starch (MS # 3800: manufactured by Nippon Food Chemical Co., Ltd.) is applied as a size solution to both sides of the paper by a size press so that the dry coating amount is 2.0 g / m ² per one side, and a cylinder drier It was dry. Thereafter, smoothing treatment was carried out using a steel calendar to produce a high quality paper (acidic paper) having a basis weight of 170 g / m ² and used as a support.

(Formation of ink receiving layer)
Next, 100 parts of fumed silica (CABOSPERSE PG-022, average particle diameter 0.15 μm, BET specific surface area 200 m ² / g: manufactured by CABOT) as a pigment, and silanol modified polyvinyl alcohol (PVA-R1130: Kuraray Co., Ltd.) as a binder 1 part and 5 parts of polyvinyl alcohol (PVA-235, saponification degree: 87 mol%: manufactured by Kuraray Co., Ltd.), 5 parts of a cationic polyurethane resin (Hydran CP-7020: manufactured by Dainippon Ink Industry Co., Ltd.) as a cationic polymer 5 parts of a cationic diallyldimethyl ammonium chloride polymer (Unisense CP-103: manufactured by Senka Co., Ltd.) was blended to obtain a coating liquid for forming an ink receiving layer having a solid content concentration of 18% by mass. Subsequently, the coating liquid for forming an ink receiving layer was coated on one side of the support obtained above using an air knife coater so as to obtain an absolute dry coating amount of 7.0 g / m ² . Next, 1.0% of boric acid as a coagulant, 1.0% of borax (disodium tetraborate decahydrate), and a nonionic polyoxyethylene surfactant (Reocol TD-90D: manufactured by Lion Corporation) 0.1%, anionic polyethylene emulsion (SN coat 289, manufactured by San Nopco) 0.4% as an anionic lubricant, potassium oleate (anionic) 0.1% as a water-soluble higher fatty acid salt, divalent An aqueous solution containing 2.0% of a water-soluble metal salt (magnesium sulfate) is further applied as a coagulating solution (concentration of the coagulating solution is 4.6%) to an absolute dry coating amount of 1.0 g / m ^2. After the surface of the resulting coated layer was in a wet state, it was pressure-bonded to a cast drum having a surface temperature of 105 ° C. to produce glossy paper for inkjet recording having a glossy appearance on the surface. At this time, the total content of the water-soluble metal salt to the total mass of the ink receiving layer is 5.4%, the total content of the surfactant is 0.27%, and the total content of the anionic lubricant Was 1.4%.

(Example 2)
Glossy paper for inkjet recording under the same conditions as described in Example 1 except that the surfactant of the coagulating liquid is changed to a nonionic acetylene glycol surfactant (Alphin PD 004, manufactured by Nisshin Chemical Industry Co., Ltd.) Was produced. At this time, the total content of the water-soluble metal salt to the total mass of the ink receiving layer is 5.4%, the total content of the surfactant is 0.27%, and the total content of the anionic lubricant Was 1.4%.

(Example 3)
In Example 1, except that the lubricant for the coagulating liquid is 0.1% anionic polyethylene emulsion (SN coat 289, manufactured by San Nopco) and 0.4% sodium laurate (anionic) which is a water-soluble higher fatty acid salt. Glossy paper for inkjet recording was produced under the conditions as described in Example 1. At this time, the total content of the water-soluble metal salt to the total mass of the ink receiving layer is 5.4%, the total content of the surfactant is 0.27%, and the total content of the anionic lubricant Was 1.4%.

(Example 4)
Glossy paper for inkjet recording was produced under the conditions as described in Example 1 except that the metal salt of the coagulating liquid 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 to the total mass of the ink receiving layer is 5.4%, the total content of the surfactant is 0.27%, and the total content of the anionic lubricant Was 1.4%.

(Example 5)
Glossy paper for inkjet recording was prepared under the same conditions as described in Example 1 except that the surfactant of the coagulating liquid was changed to a nonionic silicone surfactant (Paintadd 32, manufactured by Dow Corning Asia Co., Ltd.). did. At this time, the total content of the water-soluble metal salt to the total mass of the ink receiving layer is 5.4%, the total content of the surfactant is 0.27%, and the total content of the anionic lubricant Was 1.4%.

(Example 6)
Glossy paper for inkjet recording was produced under the conditions as described in Example 1 except that the water-soluble metal salt of the coagulating solution was changed to magnesium chloride which is a divalent water-soluble metal salt. At this time, the total content of the water-soluble metal salt to the total mass of the ink receiving layer is 5.4%, the total content of the surfactant is 0.27%, and the total content of the anionic lubricant Was 1.4%.

(Example 7)
Glossy paper for inkjet recording was produced under the conditions described in Example 1 except that the water-soluble metal salt of the coagulating solution 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 to the total mass of the ink receiving layer is 5.4%, the total content of the surfactant is 0.27%, and the total content of the anionic lubricant Was 1.4%.

(Example 8)
Glossy paper for ink jet recording under the same conditions as described in Example 1 except that the addition amount of the water-soluble metal salt in the coagulation liquid is 0.11% and the concentration of the coagulation liquid is 2.71% in Example 1. Was produced. At this time, the total content of the water-soluble metal salt to the total mass of the ink receiving layer is 0.51%, the total content of the surfactant is 0.46%, and the total content of the anionic lubricant Was 2.3%.

(Example 9)
Glossy paper for inkjet recording under the same conditions as described in Example 1 except that the addition amount of the water-soluble metal salt of the coagulation liquid is 7.8% and the concentration of the coagulation liquid is 10.4%. Was produced. At this time, the total content of the water-soluble metal salt to the total mass of the ink receiving layer is 9.4%, the total content of the surfactant is 0.12%, and the total content of the anionic lubricant Was 0.60%.

(Example 10)
Glossy paper for inkjet recording under the conditions as described in Example 1 except that the addition amount of the surfactant in the coagulation liquid is 0.0027% and the concentration of the coagulation liquid is 4.5027% in Example 1. Made. At this time, the total content of the water-soluble metal salt to the total mass of the ink receiving layer is 5.6%, the total content of the surfactant is 0.0075%, and the total content of the anionic lubricant Was 1.4%.

(Example 11)
Glossy paper for inkjet recording under the same conditions as described in Example 1 except that the addition amount of the surfactant in the coagulation liquid is 1.33% and the concentration of the coagulation liquid is 5.83% in Example 1. Made. At this time, the total content of the water-soluble metal salt relative to the total mass of the ink receiving layer is 4.3%, the total content of the surfactant is 2.9%, and the total content of the anionic lubricant Was 1.1%.

(Example 12)
In Example 1, 0.002% of an anionic polyethylene emulsion (SN coat 289, manufactured by San Nopco) and potassium oleate (anionic) 0.001 which is a water-soluble higher fatty acid salt as an additive amount of a lubricant in a coagulating liquid Glossy paper for inkjet recording was produced under the conditions described in Example 1 except that the concentration of the coagulating liquid was 4.103%. At this time, the total content of the water-soluble metal salt to the total mass of the ink receiving layer is 6.1%, the total content of the surfactant is 0.30%, and the total content of the anionic lubricant Was 0.0091%.

(Example 13)
In Example 1, 1.0% of anionic polyethylene emulsion (SN coat 289, manufactured by San Nopco) and potassium oleate (anionic), which is a water-soluble higher fatty acid salt, were used as the lubricant addition amount of the coagulating liquid. Glossy paper for inkjet recording was produced under the conditions described in Example 1 except that the concentration of the coagulating liquid was 8.7%. At this time, the total content of the water-soluble metal salt to the total mass of the ink receiving layer is 2.9%, the total content of the surfactant is 0.14%, and the total content of the anionic lubricant Was 6.6%.

(Comparative example 1)
Glossy paper for inkjet recording was produced under the same conditions as described in Example 1 except that the water-soluble metal salt of the coagulation liquid was not added and the concentration of the coagulation liquid was 2.6% in Example 1. At this time, the total content of the water-soluble metal salt is 0% to the total mass of the ink receiving layer of the coagulation liquid, the total content of the surfactant is 0.48%, and the total content of the anionic lubricant The amount was 2.4%.

(Comparative example 2)
Ink jet recording was performed under the same conditions as described in Example 1 except that the anionic polyethylene emulsion as a lubricant for the coagulating liquid in Example 1 was changed to a nonionic polyethylene emulsion (Mekatex HP-65, manufactured by Meisei Chemical Industry Co., Ltd.) Glossy paper was made. At this time, the total content of the water-soluble metal salt to the total mass of the ink receiving layer is 5.4%, the total content of the surfactant is 0.27%, and the total content of the nonionic lubricant Was 1.4%.

(Comparative example 3)
Glossy paper for inkjet recording was produced under the same conditions as described in Example 1 except that the surfactant of the coagulation liquid was not added and the concentration of the coagulation liquid was 4.5% in Example 1. At this time, the total content of the water-soluble metal salt to the total mass of the ink receiving layer is 5.6%, the total content of the surfactant is 0%, and the total content of the anionic lubricant is 1 .4%.

(Comparative example 4)
Glossy paper for inkjet recording was produced under the same conditions as described in Example 1 except that the anionic lubricant in the coagulating liquid was not added and the concentration of the coagulating liquid was 4.1% in Example 1. At this time, the total content of the water-soluble metal salt to the total mass of the ink receiving layer is 6.1%, the total content of the surfactant is 0.30%, and the total content of the anionic lubricant Was 0%.

  The following tests were conducted on the obtained glossy paper for ink jet recording, and the results are shown in Tables 1 and 2.

(1) Color development of dye ink:
ISO standard image (ISO / JIS-SCID high definition color digital standard image data, name of image: portrait, image identification number: N1) using dye ink ink jet printer (MFC-J4510N: manufactured by Brother Industries, Ltd.) , And printed on the obtained glossy paper for ink jet recording. The printed image was evaluated visually.
◎: The recorded image is very clear and the contrast is clear, and can be practically used.
○: The recorded image is clear and the contrast is clear, and it can be used practically.
Δ: The recorded image is somewhat unclear and the contrast is somewhat blurred, but it can be practically used.
X: The recorded image is extremely blurred, the contrast is significantly blurred, and it can not be used practically.

(2) Color development of pigment ink:
For ISO standard images (ISO / JIS-SCID high definition color digital standard image data, image name: portrait, image identification number: N1), using a pigment ink-only inkjet printer (CM8060 Color MFP: manufactured by Hewlett Packard Co.) It printed on the obtained glossy paper for inkjet recording. The printed image was evaluated visually.
◎: The recorded image is very clear and the contrast is clear, and can be practically used.
○: The recorded image is clear and the contrast is clear, and it can be used practically.
Fair: The recorded image is somewhat unclear and the contrast is somewhat blurred, but it can be practically used. X: The recorded image is remarkably blurred and the contrast is significantly blurred and can not be practically used.

(3) White space feeling:
The white space on the ink receiving layer was visually confirmed and evaluated according to the following criteria.
◎: There are no foreign substances or stains, and the sheet is extremely excellent in feeling of white space, and can be put to practical use. Pass.
○: Foreign matter and dirt are slightly generated, but the feeling of white space is excellent and practical. Pass.
Δ: A defect due to foreign matter or dirt occurs, which is inferior to the feeling of white space and can not be put to practical use. failure.
X: A defect due to foreign matter or stains occurs remarkably, and the feeling of white space is remarkably deteriorated, and can not be put to practical use. failure.

(4) Image clarity of the ink receiving layer surface:
The image clarity was measured to evaluate the specularity of the surface of the ink receiving layer of the obtained inkjet recording paper. The image clarity was measured with an image clarity measurement device (ICM-1T: manufactured by Suga Test Instruments Co., Ltd.) with an optical comb width of 2 mm and an incident reflection angle of 60 ° according to JIS H 8686-2. As an evaluation, when the image clarity is 55% or more, the reflected image is clearly shown, and the glossiness is excellent. If it is less than 55%, the reflected image will be unclear, and the glossiness will be poor and it will not be practical as glossy paper. Preferably it is 60% or more.

  As is clear from Tables 1 to 3, Examples 1 to 13 were superior to Comparative Examples 1 to 4 in color developability, white space sensitivity and image clarity of dye ink and pigment ink.

  Comparative Example 1 was inferior in color developability of the pigment ink because the ink receiving layer contained no water-soluble metal salt. Further, Comparative Example 2 was inferior in image clarity because the ink receiving layer contained no anionic polyethylene emulsion. In addition, Comparative Example 3 was inferior in the feeling of white space because the ink receiving layer did not contain a surfactant. In addition, Comparative Example 4 was inferior in image clarity because the ink receiving layer did not contain an anionic lubricant.

Claims (4)

Glossy paper for ink jet recording provided with an ink receiving layer on at least one surface of a support, wherein the ink receiving layer contains an anionic lubricant, a surfactant and a water-soluble metal salt, and the anionic lubricant Is a method for producing glossy paper for ink jet recording comprising a higher fatty acid salt and an anionic polyethylene , wherein the coating composition for forming an ink receiving layer is coated on a support, and then the anionic lubricant is used. Applying a coagulating solution containing the coating agent, the surfactant, and the water-soluble metal salt and performing coagulation treatment, and then pressing the cast drum against the cast drum while the surface of the obtained coated layer is in a wet state The manufacturing method characterized by the above. The method for producing glossy paper for ink jet recording according to claim 1, wherein the surfactant is a nonionic surfactant . The method for producing glossy paper for ink jet recording according to claim 1 or 2, wherein the water-soluble metal salt is a water-soluble metal salt having a valence of 2 or more . The method for producing glossy paper for ink jet recording according to claim 3, wherein the water-soluble metal salt is a water-soluble metal salt having a valence of 2 or more selected from magnesium sulfate, magnesium chloride and calcium chloride .