JP2012131198A - Inkjet recording material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inkjet recording material, which has superior anti-blur properties of images, has gloss feeling with an artistic quality, and has superior glossiness.SOLUTION: The inkjet recording material is provided with, on at least one surface of a gas-permeable support, an ink receiving layer which contains: alumina, or alumina hydrate of which an average particle size of primary particles is 10-50 nm; pigment which is a laminated mica particle having a surface coated by titanium oxide and average particle size of 10-200 μm, polyurea compound, and an adhesive.

Description

  The present invention relates to an ink-jet recording material having art properties used for work production and display applications. In particular, the present invention relates to an ink jet recording material having glossiness and artisticity due to deep glossiness obtained by light interference caused by reflection of multiple layers of light.

  In recent years, due to remarkable progress of inkjet printers and plotters, full-color and high-definition images can be easily obtained.

  The ink jet recording system records images, characters, and the like by causing micro droplets of ink to fly and adhere to a recording material such as paper according to various operating principles. The ink jet recording system has been rapidly adopted in various applications as a hard copy creating apparatus for image information such as letters and various figures created by a computer. In particular, color images formed by the multicolor ink jet recording method can obtain recordings that are inferior to those of multicolor printing by the plate making method and printing by the color photographic method. It is widely applied because it is cheaper than printing and photographic techniques.

  In the production of photographs and designs, inkjet recording materials printed by the inkjet recording method are often used for display purposes such as posters and labels. It is important that the ink-jet recording material used for such exhibition purposes is eye-catching, and it is not only a conventional high glossiness but also an artistic glossiness and excellent glossiness. Recording materials are desired.

  As an ink-jet recording material having artistic gloss, an information recording paper having a coating layer formed by applying a coating liquid containing fine fibrous cellulose, a hydrophilic resin, and a pearl pigment on at least one surface of a base paper. Yes (see, for example, Patent Document 1). It is characterized by a glittery texture in the matte tone.

  Similarly, as an ink jet recording material having an artistic gloss, there is a recording sheet having a matte metallic glossy surface provided with a recording layer containing a pearl pigment on the metal glossy side of the support (for example, Patent Document 2). It is characterized by having a matte metallic luster.

  These are matte or matte metallic tone, and each has an artistic gloss, but the gloss is not high.

JP 2008-007899 A JP 2001-270234 A

  An ink jet recording material using a gas-permeable support has a property of absorbing moisture and moisture and moisture from the front and back. In particular, this property is relatively large on the back surface having no coating layer. Due to the influence of this property, an image formed on the recording material may be blurred by moisture retained in the recording material. Even if it has an artistic glossiness that is eye-catching, the artiness is impaired if the image is blurred.

  An object of the present invention is to provide an ink jet recording material having artistic gloss and excellent gloss. In addition, an object of the present invention is to provide an ink jet recording material excellent in bleeding resistance capable of suppressing bleeding of an image formed on the recording material.

  As a result of studying this problem, the solution to the problem is that at least one surface on the gas-permeable support is alumina or an alumina hydrate having an average primary particle diameter of 10 nm or more and 50 nm or less. It is achieved by an ink jet recording material comprising an ink receiving layer containing a pigment having a mean particle size of 10 μm or more and 200 μm or less, the surface of mica (mica) particles coated with titanium oxide, a polyurea compound, and an adhesive. .

  Further, the content of the pigment having an average particle diameter of 10 μm or more and 200 μm or less in which the surface of the thin mica particles of the ink receiving layer is coated with titanium oxide is the total content of alumina or alumina hydrate in the ink receiving layer. It is preferable that they are 5 mass% or more and 25 mass% or less with respect to quantity.

  Further, an ink jet recording material in which an intermediate layer containing amorphous silica is provided between the gas-permeable support and the ink receiving layer is preferable.

  According to the present invention, an ink jet recording material having artistic gloss and excellent gloss can be obtained. In addition, an ink jet recording material excellent in image bleeding resistance can be obtained.

Hereinafter, the ink jet recording material of the present invention will be described in detail.
As a result of intensive studies on the ink-receiving layer, the present inventors have found that the surface of the alumina or alumina hydrate or lamellar mica (mica) particles having an average primary particle size of 10 nm to 50 nm is titanium oxide. An ink jet recording material provided with an ink receiving layer containing a pigment, a polyurea compound, and an adhesive having an average particle diameter of 10 μm or more and 200 μm or less coated with the above. This ink jet recording material has excellent bleeding resistance and gloss, and it is possible to obtain artistic properties due to deep glossiness obtained by light interference caused by light multilayer reflection.

In the present invention, alumina or alumina hydrate is aluminum oxide or a hydrated product thereof, which may be crystalline or amorphous, and those having an amorphous shape, a spherical shape, a plate shape, or the like can be used. Either of them may be used or may be used in combination. As the aluminum oxide, γ-alumina, which is a γ-type crystal of aluminum oxide, is preferable, and a δ group crystal is particularly preferable. The hydrated aluminum oxide is represented by a structural formula of Al ₂ O ₃ .nH ₂ O (n = 1 to 3). The case where n is 1 represents an alumina hydrate having a boehmite structure, and the case where n is greater than 1 and less than 3 represents an alumina hydrate having a pseudo boehmite structure. It can be obtained by a known production method such as hydrolysis of an aluminum alkoxide such as aluminum isopropoxide, neutralization of an aluminum salt with an alkali, or hydrolysis of an aluminate.

  In the present invention, the average particle size of primary particles of alumina or alumina hydrate is 10 nm or more and 50 nm or less.

  In the present invention, the alumina or alumina hydrate is preferably more than 50% by mass of the total pigment content of the ink receiving layer.

  In the present invention, as described in, for example, JP-A-2006-291156, a pigment in which the surface of lamellar mica (mica) particles is coated with titanium oxide has a constant speed to a slurry in which a flaky substrate is dispersed. In addition, a titration method in which a titanium oxide layer having a desired thickness is coated on a flaky substrate, or a titanium-containing solution is first mixed with a flaky substrate dispersion slurry, together with urea, if necessary. It can be obtained by a uniform precipitation method in which a titanium oxide coating layer is obtained on a flaky substrate by heating and stirring to hydrolyze a titanium raw material. Mica (mica) particles may be prepared by pulverizing and classifying natural mica (mica), or may be synthesized artificially. Synthetic mica (mica) is preferred from the standpoint of quality uniformity and stability.

  In addition to coating with titanium oxide, other metal oxides such as iron oxide can be used in combination with titanium oxide. When a metal oxide other than titanium oxide is used in combination, the reflected light may be colored. Titanium oxide alone is preferable.

  In the present invention, the pigment having the surface of the thin plate-like mica (mica) particles coated with titanium oxide has an average particle size of 10 μm or more and 200 μm or less. Such pigments are commercially available from Nippon Koken Kogyo and Merck.

  In the present invention, the average particle diameter is obtained by approximating the average particle diameter from the diameter of a circle equal to the projected area of each of the 100 particles present in the observation field of the dispersed particles observed with an electron microscope. . The average particle diameter of the primary particles is an average particle diameter in a state of being dispersed in the primary particles, and the other is an average particle diameter including aggregated particles.

  In general, the pigment has an irregular shape, a spherical shape, a rod shape, a spindle shape, a flat plate shape, or the like. A pigment having a particle size of 1 μm or less exhibits inherent glossiness and glossiness due to absorption and reflection of light. Particles whose surface is coated with titanium oxide on the surface of lamellar mica (mica) particles have a layered structure, so that light is reflected in multiple layers and the depth obtained by the interference of light that occurs because the reflection distance is not constant. A certain artistic gloss can be obtained. In order to enable multi-layer reflection, a certain particle size is required, and it is difficult to achieve both artistic gloss and gloss.

  In the present invention, by combining alumina or alumina hydrate with a pigment in which the surface of lamellar mica (mica) particles is coated with titanium oxide, it is possible to obtain glossiness with artistic properties while maintaining glossiness. it can.

  In order to obtain glossiness with artisticity while maintaining glossiness, the average particle diameter of primary particles of alumina and alumina hydrate is 10 nm or more and 50 nm or less, and the lamellar mica (mica) particles The average particle diameter of the pigment whose surface is coated with titanium oxide is 10 μm or more and 200 μm or less.

  Outside the above range of particle size, it is not possible to achieve both artistic gloss and gloss. When the average particle diameter of the pigment whose surface is coated with titanium oxide is increased, the glossiness is lowered. When it becomes smaller, the glossiness with artistic properties decreases. When the average particle size of the primary particles of alumina or alumina hydrate increases, the glossiness decreases, and when it decreases, the ink absorbency decreases. Even if silica is used instead of alumina or hydrated alumina, gloss cannot be obtained.

  In the present invention, the content of the pigment in which the surface of the lamellar mica (mica) particles is coated with titanium oxide in the ink receiving layer is 5% by mass of the total content of alumina or alumina hydrate in the ink receiving layer. The content is preferably 25% by mass or less. By being within this range, glossiness and glossiness having artistic properties can be obtained, and furthermore, the ink jet recording material can obtain bleeding resistance. Since titanium oxide is a relatively hydrophilic substance, a pigment in which the surface of lamellar mica particles is coated with titanium oxide is 5% by mass to 25% by mass of the total content of alumina or alumina hydrate. By making the following, it is considered that bleeding of an image formed on the ink jet recording material can be suppressed while having glossiness and artistic glossiness.

  As long as the effects of the present invention are not impaired, pigments such as colloidal silica, gel method silica, precipitation method silica, and vapor phase method silica can be used in the ink receiving layer according to the present invention. . In order not to impair the effects of the present invention, the content of the pigment other than alumina or alumina hydrate is preferably less than 50% by mass of the total pigment.

  In the present invention, the adhesive used in the ink receiving layer is not particularly limited, and examples thereof include starches such as starch, oxidized starch, phosphate esterified starch, enzyme-modified starch and cold water soluble starch obtained by flash drying them. , Various copolymer latexes such as styrene butadiene series, acrylic series, vinyl acetate series, water soluble compounds such as polyvinyl alcohol, sodium polyacrylate, polyethylene oxide, polyacrylamide, melamine formalin resin, polyethyleneimine, polyamide polyamine epichlorohydrin resin, Examples include natural products such as wax, casein, and soy protein, and modified products obtained by cationizing these. These may be used alone, and the use of a plurality of these in combination is not limited. Polyvinyl alcohol is preferable.

  In the present invention, polyvinyl alcohol that can be suitably used is polyvinyl alcohol having various saponification degrees from 70 mol% to 100 mol%. Also used are modified polyvinyl alcohols with various functional groups such as silyl group, carboxyl group, amino group, acetoacetyl group, and modified polyvinyl alcohols with other monomers such as ethylene introduced randomly, grafted or in blocks. You can also These various saponified polyvinyl alcohols or these modified polyvinyl alcohols may be used alone or in combination of two or more.

  Polyvinyl alcohol, whose aqueous solution has a higher viscosity, is less likely to cause surface cracks when the coated ink-receiving layer is dried, even if the content is relatively small. This is preferable because the ink absorbability can be improved as a result. On the other hand, if the viscosity of the aqueous solution is too high, the viscosity of the coating solution for the ink receiving layer becomes too high, which may make the coating operation difficult. Specifically, the viscosity of an aqueous solution having a solid content concentration of 4% by mass measured using an Ubbelohde viscometer at 25 ° C. based on JIS Z8803 is preferably 15 mPa · second to 400 mPa · second, preferably 30 mPa · second. More preferably, it is 200 mPa · sec or less.

  In the present invention, the content of the adhesive in the ink receiving layer is preferably 2% by mass or more and 40% by mass or less, and more preferably 5% by mass or more and 30% by mass or less of the total pigment in the ink receiving layer. . If the amount is too small, the surface may be cracked during drying, or the surface strength of the formed inkjet recording material may be insufficient. On the other hand, if the content of the adhesive is too much, the ink absorbability may be lowered.

  In the present invention, the ink receiving layer contains a polyurea compound separately from the adhesive. A polyurea compound is a compound having a plurality of urea groups. Preferably, it is a urea urethane compound having a plurality of urea groups. Such urea urethane compounds are commercially available from BYK Japan Japan under the names BYK-420, BYK-E420, and BYK-425, and can be used in the present invention. More preferably, the urea urethane compound has a modified urethane structure at the connecting portion between the urea group and the urea group, and has a modified urethane structure having a stronger polarity than the modified urethane structure of the connecting portion at the end of the compound. It is the urea urethane compound which consists of. Such urea urethane compounds are BYK-420 and BYK-E420 described above.

  Polyurea compounds are adsorbed on the surface of the pigment by the hydrogen bonding force and the association action due to the strong polarity of the urea group, and physically suppress the precipitation of the pigment in the coating liquid after coating. ) It is considered that even a relatively large pigment having a particle diameter of 10 μm or more whose surface is coated with titanium oxide can prevent sedimentation and give the ink receiving layer an artistic gloss. With a conventionally known adhesive alone, settling cannot be sufficiently suppressed, and glossiness with artistic properties cannot be obtained.

  In the present invention, the content of the polyurea compound in the ink receiving layer is 0.01% by mass or more to the content of the pigment in which the surface of the lamellar mica particles in the ink receiving layer is coated with titanium oxide. It is preferable that it is below mass%. If it exceeds 1 mass%, the image formed on the ink jet recording material may bleed due to the hydrophilicity due to the polarity of the urea group of the polyurea compound. When the content is in the above range, the effect of suppressing the precipitation of the pigment can be obtained, and bleeding of the image formed on the ink jet recording material can be further suppressed.

  In the ink-receiving layer of the present invention, various known additives such as a surfactant, a colorant, an antifoaming agent, a fluorescent brightening agent, an ink fixing agent, a water-resistant agent, an antioxidant, and an ultraviolet absorber are optionally added. An agent can also be added.

  In the present invention, the method for applying the ink receiving layer coating liquid is not particularly limited, and blade coaters such as air knife coaters and rod blade coaters, bar coaters, reverse roll coaters, comma coaters (registered trademark), and gate roll coaters. Various coating methods such as a film transfer coater, a lip coater, a die coater, and a curtain coater can be used. Of these, the curtain coater is preferable as the coating method for coating the air-permeable support with the coating liquid according to the present invention from the viewpoint of the coating stability of the coating liquid according to the present invention.

In the present invention, the coating amount for coating the ink-receiving layer coating liquid on the air-permeable support is not particularly limited, but is usually 10 g / m ² or more and 25 g as a solid content in terms of ink absorbability and production cost. It is preferable to apply in the range of / m ² or less. However, when it is particularly required to absorb a large amount of ink, it may be preferable to apply about 30 g / m ² .

  In the present invention, it is preferable to provide an intermediate layer between the ink receiving layer and the air-permeable support. By providing the intermediate layer, the ink absorbability of the entire inkjet recording material can be further increased. The intermediate layer may be one layer or two or more layers. In two or more layers, the composition of the coating liquid for the intermediate layer forming the intermediate layer may be the same or different. The composition of the intermediate layer coating solution may be the same as that of the ink receiving layer coating solution.

  The intermediate layer adjacent to the ink receiving layer preferably contains amorphous silica. When the intermediate layer adjacent to the ink receiving layer contains amorphous silica, the glossiness or artistic glossiness of the ink receiving layer is hardly lowered.

Further, the coating amount of the intermediate layer is not limited as in the case of the ink receiving layer, but it is preferable to apply a total solid content of 10 g / m ² or more and 25 g / m ² or less. However, when it is particularly required to absorb a large amount of ink, it may be preferable to apply a total of about 30 g / m ² .

  In the present invention, after each coating and drying of the ink receiving layer and the intermediate layer, calendering can be performed for the purpose of controlling the flatness of each layer and the air resistance. Examples of the calendar processing device at that time include a gloss calendar, a super calendar, and a soft calendar.

  In the present invention, paper is preferable as the gas-permeable support. If there is air permeability, coated paper can be used as a support, or non-paper such as non-woven fabric can be used as a support.

  In the present invention, the paper used as the air-permeable support is ordinary paper produced by a conventionally known method and is not particularly limited. The paper used as the air-permeable support is preferably paper made by adding other paper-making aids to paper stock containing wood pulp and filler as required.

  The wood pulp used can be obtained by various pulp manufacturing methods. For example, conventionally known chemical pulps such as LBKP (hardwood bleached kraft pulp), NBKP (softwood bleached kraft pulp), LBSP (hardwood bleached sulfite pulp), NBSP (softwood bleached sulfite pulp), GP (ground pulp) and TMP Examples include various mechanical pulps such as (thermomechanical pulp) and waste paper pulp. In addition, pulps subjected to chemical treatment such as non-wood pulp, synthetic pulp, and pulp obtained by mercerizing various pulp fibers can be used in combination as long as the quality of the paper is not impaired. These pulps are adjusted for freeness by a beating machine in order to satisfy papermaking suitability, coating suitability, and ink jet recording suitability. The pulp beating degree varies depending on the type of pulp, but generally it is preferably 150 ml or more and 550 ml or less, and adjusted to 300 ml or more and 500 ml or less by CSF (which means Canadian Standard Freeness defined by JIS P8121). More preferably.

  The filler used is used for maintaining opacity and ink jet recording suitability, and examples thereof include conventionally known fillers such as talc, various kaolins and calcium carbonate. In particular, calcium carbonate is preferable because it becomes a paper with high whiteness. The mixing amount of the filler is preferably 5 parts by mass or more and 30 parts by mass or less, and particularly preferably 10 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the total pulp of wood pulp and non-wood pulp.

  In the present invention, various conventionally known auxiliaries can be used as paper making aids for the paper used as the gas-permeable support. For example, starch, polyacrylamide resin, polyvinyl alcohol, galactomannan, polyamide polyamine epichlorohydrin resin, etc. Rosin derivatives, fixing agents such as water-soluble aluminum salts such as aluminum chloride and sulfuric acid bands, pH adjusters such as sodium hydroxide, sodium carbonate, sulfuric acid and hydrochloric acid, as well as yield improvers, colored dyes or pigments, fluorescent enhancement They are whitening agents and bulking agents, and can be contained in appropriate combinations.

  In the present invention, the paper machine used for paper production is not particularly limited. For example, a paper machine known in the paper industry such as a long paper machine, a twin wire paper machine, a hybrid paper machine, a circular paper machine, a Yankee paper machine, and various combination paper machines can be used as appropriate. The paper may be acid paper, neutral paper or alkaline paper.

  Examples of the present invention are shown below. In the examples, unless otherwise specified, “part” means mass part and “%” means mass%.

<Preparation of Alumina Hydrate Dispersion 1>
1 part of acetic acid is mixed with 299 parts of water, 100 parts of alumina hydrate (Disperal HP14 manufactured by Sasol) having an average primary particle size of 14 nm is added, and the mixture is stirred as it is for 2 hours. A Japanese dispersion 1 was obtained.

<Preparation of Alumina Hydrate Dispersion 2>
Mix 299 parts of water with 1 part of acetic acid, add 100 parts of alumina hydrate (Disperal made by Sasol) with an average primary particle size of 10 nm, stir for 2 hours, and hydrate alumina with a solid content of 25%. A product dispersion 2 was obtained.

<Preparation of Alumina Hydrate Dispersion 3>
1 part of acetic acid is mixed with 299 parts of water, 100 parts of alumina hydrate (Disperal HP30 manufactured by Sasol) having an average primary particle size of 30 nm is added, and the mixture is stirred for 2 hours as it is, and the alumina water having a solid content concentration of 25% is added. A Japanese dispersion 3 was obtained.

<Preparation of Alumina Hydrate Dispersion 4>
1 part of acetic acid is mixed with 299 parts of water, 100 parts of alumina hydrate (Disperal 40 made by Sasol) having an average primary particle size of 40 nm is added, and the mixture is stirred for 2 hours as it is, and the alumina water having a solid content concentration of 25% is added. A Japanese dispersion 4 was obtained.

<Preparation of Alumina Hydrate Dispersion 5>
Mix 299 parts of water with 1 part of acetic acid, add 100 parts of alumina hydrate (Dispal 25F4 from Sasol) with an average primary particle size of 4 nm, and stir for 2 hours. A Japanese dispersion 5 was obtained.

<Preparation of Alumina Hydrate Dispersion 6>
1 part of acetic acid is mixed with 299 parts of water, 100 parts of alumina hydrate (Disperal 60 manufactured by Sasol) having an average primary particle diameter of 60 nm is added, and the mixture is stirred for 2 hours as it is, and the alumina water having a solid content concentration of 25% is added. A Japanese dispersion 6 was obtained.

<Preparation of alumina dispersion>
Mix 299 parts of water with 1 part of acetic acid, add 100 parts of alumina (Aerosil aluminum oxide C manufactured by Nippon Aerosil Co., Ltd.) having an average primary particle size of 13 nm, and stir for 2 hours as it is to disperse alumina with a solid content concentration of 25%. A liquid was obtained.

<Preparation of gas phase method silica dispersion>
While stirring 392 parts of water, 8 parts of a 50% aqueous solution of dimethyldiallylammonium chloride polymer having a viscosity of 400 mPa · s (4 parts solids), gas phase method silica having an average primary particle diameter of 12 nm (Nippon Aerosil) Aerosil 200V, 100 parts by specific surface area 200 m ² / g) according to the BET method was added and predispersed using a blade type disperser. The obtained preliminary dispersion was treated with a colloid mill to obtain a vapor phase silica dispersion having a solid concentration of 20.8%.

<Preparation of coating liquid 1 for ink receiving layer>
100 parts of the above-mentioned alumina hydrate dispersion 1 (25 parts of solid content), 25 parts of 10% aqueous solution of polyvinyl alcohol having a saponification degree of 88 mol% (PVA235 manufactured by Kuraray) (solid content of 2.5 parts), 2.5 parts of pigment 1 (Nippon Koken Kogyo ME-100R, average particle size 20 μm) coated with titanium oxide on the surface of mica (mica) particles, and a polyurea compound (BYK-420 manufactured by BYK Japan KK) of 0. The ink receiving layer coating solution 1 was prepared by adding 025 parts.

<Preparation of coating liquid 2 for ink receiving layer>
In the ink-receiving layer coating liquid 1, the same procedure as in the ink-receiving layer coating liquid 1 except that the alumina hydrate dispersion liquid 2 was used instead of the alumina hydrate dispersion liquid 1. Coating liquid 2 was prepared.

<Preparation of coating solution 3 for ink receiving layer>
In the ink-receiving layer coating liquid 1, the same procedure as in the ink-receiving layer coating liquid 1 except that the alumina hydrate dispersion liquid 3 was used instead of the alumina hydrate dispersion liquid 1. A coating solution 3 was prepared.

<Preparation of coating liquid 4 for ink receiving layer>
In the ink-receiving layer coating solution 1, the same procedure as in the ink-receiving layer coating solution 1 except that the alumina hydrate dispersion 4 was used instead of the alumina hydrate dispersion 1. A coating solution 4 was prepared.

<Preparation of coating solution 5 for ink receiving layer>
In the ink-receiving layer coating solution 1, the same procedure as in the ink-receiving layer coating solution 1 except that the alumina hydrate dispersion 5 was used instead of the alumina hydrate dispersion 1. A coating solution 5 was prepared.

<Preparation of coating liquid 6 for ink receiving layer>
In the ink-receiving layer coating liquid 1, the same procedure as in the ink-receiving layer coating liquid 1 except that the alumina hydrate dispersion liquid 6 was used instead of the alumina hydrate dispersion liquid 1. A coating solution 6 was prepared.

<Preparation of coating liquid 7 for ink receiving layer>
Ink-receiving layer coating liquid 1 was used in the same manner as ink-receiving layer coating liquid 1 except that an alumina dispersion was used instead of alumina hydrate dispersion 1 in ink-receiving layer coating liquid 1. Was prepared.

<Preparation of coating liquid 8 for ink receiving layer>
100 parts of the above-mentioned gas phase method silica dispersion (20.8 parts of solid content), 50 parts of 10% aqueous solution of polyvinyl alcohol (PVA235 manufactured by Kuraray) having a saponification degree of 88 mol% (solid content of 5 parts), lamellar mica (Mica) 2.5 parts of pigment 1 (Nippon Koken Kogyo ME-100R, average particle size 20 μm) coated with titanium oxide on the surface of particles, and polyurea compound (BYK-420 BYK-420) 0.025 An ink receiving layer coating solution 8 was prepared by adding a part thereof.

Example 1
^On a paper having a basis weight of 81.4 g / m ² (Mitsubishi Paper Diamond Form), the coating solution 1 for the ink receiving layer was applied using a curtain coater so that the coating amount was 18 g / m ^2. The ink jet recording material of Example 1 was obtained by drying using a hot air dryer.

(Example 2)
The ink jet recording material of Example 2 was obtained in the same manner as in Example 1 except that the ink receiving layer coating liquid 2 was used instead of the ink receiving layer coating liquid 1 in the ink jet recording material of Example 1. It was.

(Example 3)
The ink jet recording material of Example 3 was obtained in the same manner as in Example 1 except that the ink receiving layer coating liquid 3 was used instead of the ink receiving layer coating liquid 1 in the ink jet recording material of Example 1. It was.

Example 4
In the inkjet recording material of Example 1, the inkjet recording material of Example 4 was obtained in the same manner as in Example 1 except that the coating liquid 4 for the ink receiving layer was used instead of the coating liquid 1 for the ink receiving layer. It was.

(Example 5)
The ink jet recording material of Example 5 was obtained in the same manner as in Example 1 except that the ink receiving layer coating liquid 7 was used instead of the ink receiving layer coating liquid 1 in the ink jet recording material of Example 1. It was.

(Example 6)
By dispersing and filtering Pigment 2 (MXL-100R, manufactured by Nippon Koken Kogyo Co., Ltd., average particle size of 300 μm) coated with titanium oxide on the surface of lamellar mica (mica) particles using a blade type disperser Pigment 3 was obtained in which the surfaces of thin mica particles having an average particle diameter of 180 μm were coated with titanium oxide. In the ink jet recording material of Example 1, instead of pigment 1 (ME-100R) in which the surface of the thin plate-like mica (mica) particles used in the ink receiving layer coating liquid 1 is coated with titanium oxide, the thin plate shape is used. An ink jet recording material of Example 6 was obtained in the same manner as in Example 1 except that Pigment 3 (average particle diameter of 180 μm) whose surfaces of mica (mica) particles were coated with titanium oxide was used.

(Example 7)
Example 1 except that the polyurea compound (BYK-425 manufactured by BYK Japan) was used instead of the polyurea compound (BYK-420) used in the ink receiving layer coating liquid 1 in the ink jet recording material of Example 1. In the same manner as in Example 1, an ink jet recording material of Example 7 was obtained.

(Example 8)
In the ink jet recording material of Example 1, 1 part is added to Pigment 1 (ME-100R) in which the surface of a thin plate-like mica (mica) particle used in the ink receiving layer coating liquid 1 is coated with titanium oxide. An ink jet recording material of Example 8 was obtained in the same manner as Example 1 except for the above.

Example 9
In the ink jet recording material of Example 1, the amount of pigment 1 (ME-100R) added to the surface of the thin plate-like mica (mica) particles used in the ink receiving layer coating liquid 1 with titanium oxide was set to 7. An inkjet recording material of Example 9 was obtained in the same manner as Example 1 except that the amount was 5 parts.

(Example 10)
Coating the ink receiving layer coating liquid 8 on paper having a basis weight of 81.4 g / m ² (Mitsubishi Paper Diaform) using a curtain coater so that the coating amount is 8 g / m ^2. Then, drying is performed using a hot air dryer, and then the ink receiving layer coating liquid 1 is applied using a curtain coater so that the coating amount is 10 g / m ^2. The ink-jet recording material of Example 10 was obtained.

(Comparative Example 1)
In the inkjet recording material of Example 1, the inkjet recording material of Comparative Example 1 was obtained in the same manner as in Example 1 except that the ink receiving layer coating solution 5 was used instead of the ink receiving layer coating solution 1. It was.

(Comparative Example 2)
In the inkjet recording material of Example 1, the inkjet recording material of Comparative Example 2 was obtained in the same manner as in Example 1 except that the ink receiving layer coating solution 6 was used instead of the ink receiving layer coating solution 1. It was.

(Comparative Example 3)
In the inkjet recording material of Example 1, the inkjet recording material of Comparative Example 3 was obtained in the same manner as in Example 1 except that the ink receiving layer coating liquid 8 was used instead of the ink receiving layer coating liquid 1. It was.

(Comparative Example 4)
In the ink jet recording material of Example 1, instead of pigment 1 (ME-100R) in which the surface of the thin plate-like mica (mica) particles used in the ink receiving layer coating liquid 1 is coated with titanium oxide, the thin plate shape is used. Inkjet recording of Comparative Example 4 in the same manner as in Example 1 except that Pigment 4 (MF-100RN, manufactured by Nippon Koken Kogyo Co., Ltd., average particle size: 8 μm) having the surface of mica (mica) particles coated with titanium oxide was used. Obtained material.

(Comparative Example 5)
In the ink jet recording material of Example 1, instead of pigment 1 (ME-100R) in which the surface of the thin plate-like mica (mica) particles used in the ink receiving layer coating liquid 1 is coated with titanium oxide, the thin plate shape is used. The same procedure as in Example 1 was carried out except that pigment 2 (MXL-100R, manufactured by Nippon Koken Kogyo Co., Ltd., average particle size: 300 μm) whose surface was coated with titanium oxide was used. However, the surface is extremely rough and an ink jet recording material cannot be obtained.

(Comparative Example 6)
In the inkjet recording material of Example 1, except that Pigment 1 (ME-100R) in which the surface of the thin plate-like mica (mica) particles used in the coating liquid 1 for the ink receiving layer was coated with titanium oxide was not used. In the same manner as in Example 1, an inkjet recording material of Comparative Example 6 was obtained.

(Comparative Example 7)
In the inkjet recording material of Example 1, a polyacrylamide compound (Hydrocol HC-880 manufactured by Ciba Specialty Chemicals) was used instead of the polyurea compound (BYK-420) used in the coating liquid 1 for the ink receiving layer. In the same manner as in Example 1, an inkjet recording material of Comparative Example 7 was obtained.

(Comparative Example 8)
In the inkjet recording material of Example 1, the inkjet recording material of Comparative Example 8 was prepared in the same manner as in Example 1 except that the polyurea compound (BYK-420) used in the coating liquid 1 for the ink receiving layer was not used. Obtained.

<Evaluation method>
The ink jet recording materials obtained in Examples 1 to 10 and Comparative Examples 1 to 8 were evaluated for the artistic glossiness, glossiness, bleeding of printed images, and ink absorptivity by the following methods.

<Artistic luster>
The depth of gloss obtained from light interference caused by multiple-layer reflection of light from the right angle and oblique line of view for the blank paper and black, cyan, magenta, and yellow solid print parts Visual evaluation was performed. The glossiness with artistic properties according to the present invention is evaluated as ◯ or Δ.
○: Both right-angled eyes and diagonal eyes have a deep gloss.
(Triangle | delta): There exists a deep glossiness by an oblique eye line.
X: There is no deep glossiness.

<Glossiness>
By observing the blank inkjet recording material, it was visually determined as follows. The excellent glossiness according to the present invention is evaluated as ◯ or Δ.
○: High glossiness.
Δ: Glossy.
X: Matte or matte tone.

<Bleeding of printed image>
After printing solid colors of black, cyan, magenta, and yellow with a Seiko Epson inkjet printer (PM-G850), the inkjet recording material was exposed to an environment of 30 ° C. and 80% RH for 1 week to determine the degree of bleeding of each color. It observed visually and evaluated by the following reference | standard. It is evaluation of (circle) or (triangle | delta) that it is excellent in the blur suppression of the printed image concerning this invention.
○: No bleeding is seen in each color.
Δ: Slight blur is observed in any of the colors, but there is no practical problem.
X: Bleeding is observed in any color.

<Ink absorbability>
Printed 2cm square color patch evaluation images of black, cyan, magenta, yellow, red, green, and blue using a Seiko Epson ink jet printer (PM-G850), and the ink absorbability of the ink jet recording material is the level of unevenness in the print area. The sharpness of the boundary between patches was visually evaluated. The ink absorptivity according to the present invention is evaluated as ◎, ○, or Δ.
A: There is no unevenness in the printed part, and the boundary is clear.
○: There is no unevenness in the printed part, and there is a slight blur at the boundary between red, green and blue.
Δ: There is no unevenness in the printed part, but there is a slight blur in the boundary part.
X: Unevenness is observed in the printed portion, and bleeding can be confirmed at the boundary portion.

  The evaluation results are shown in Table 1.

  From Table 1, the ink jet recording materials of Examples 1 to 10 according to the present invention have glossiness with artistic properties, excellent glossiness, little blur of the image area, and good ink absorbability. In particular, when the content of the pigment in which the surface of the lamellar mica (mica) particles is coated with titanium oxide is 5% or more and 25% or less with respect to the total content of alumina or alumina hydrate, It turns out that the effect of is excellent.

  On the other hand, the inkjet recording materials of Comparative Examples 1 to 8 that do not fall under the present invention cannot satisfy all the effects according to the present invention. In Comparative Example 6, there is no pigment in which the surface of the thin plate-like mica (mica) particles is coated with titanium oxide, or in Comparative Examples 7 and 8, since no polyurea compound is contained, In addition, a pigment coated with titanium oxide on the surface of lamellar mica (mica) particles sank, resulting in an extremely strong gloss and no artistic luster. In Comparative Example 3, silica was used instead of alumina or alumina hydrate, and an artistic gloss was not obtained.

Claims (3)

  An average particle in which the surface of alumina or alumina hydrate or lamellar mica (mica) particles having an average primary particle size of 10 nm to 50 nm is coated with titanium oxide on at least one surface on the air-permeable support. An ink jet recording material comprising an ink receiving layer containing a pigment having a diameter of 10 μm or more and 200 μm or less, a polyurea compound, and an adhesive.   The content of the pigment having an average particle diameter of 10 μm or more and 200 μm or less in which the surface of the thin mica particles of the ink receiving layer is coated with titanium oxide is the total content of alumina or alumina hydrate in the ink receiving layer. The inkjet recording material according to claim 1, wherein the content is 5% by mass or more and 25% by mass or less.   2. The ink jet recording material according to claim 1, wherein an intermediate layer containing amorphous silica is provided between the air-permeable support and the ink receiving layer.