JP2006240017A - Inkjet recording matter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inkjet recording matter which has a very excellent surface quality and causes little dusting in guillotine cutting. <P>SOLUTION: The inkjet recording matter has a constitution wherein one or more ink accepting layers are laid at least on one side of a substrate and a gloss revealing layer on the ink accepting layer by a casting method. The ink accepting layer adjoining the gloss revealing layer contains a pigment, a binder and a cationic resin. The average secondary particle diameter of the pigment is 3-6 μm and the oil absorption amount thereof is 210-330 ml/100 g. This ink accepting layer contains polyvinyl alcohol having a saponification degree of 99.9% or more and making up 30-70% to the pigment in the mass ratio, as the binder, and a polyamidine compound as the cationic resin. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an ink jet recording material having a glossy layer coated thereon by a casting method, and more particularly to an ink jet recording material having a very good surface quality and less powder falling when guillotine is cut. .

  The ink jet recording system is a method for recording images, characters, etc. by ejecting micro droplets of ink by various operating principles and attaching them to a recording sheet such as paper or film. It is easy to create, has great flexibility in recording patterns, and does not require development-fixing, and has rapidly spread to various uses as a recording device for various figures and color images including kanji. In addition, an image formed by the multi-color ink jet method can obtain an inferior recording as compared with printing by the multi-color printing by the plate making method or the multi-color color photographic method. In applications where the number of copies to be produced is small, it is being applied widely to the field of full-color image recording because it is less expensive than with photographic technology.

  In recent years, various inkjet printers capable of high-quality printing similar to silver halide photography have been put on the market, and the quality required for inkjet recording materials has become more severe than ever. Specifically, the appearance has a strong gloss and high image clarity, excellent ink absorbability, and coating layer strength, and all of these are required. In order to improve these various characteristics, various proposals have been made so far and a certain effect has been achieved. However, it has been known that there is a trade-off relationship between particularly excellent ink absorbability and coating layer strength. Has not been proposed yet.

  Patent Document 1 proposes using polyvinyl alcohol having a saponification degree of 96% or more as a binder, paying attention to water resistance of the recording layer. However, the water resistance of the recording layer is insufficient when a glossy layer is applied by a casting method performed to obtain a good glossy surface. Also, coating defects are likely to occur when the glossy layer is applied.

In Patent Document 2, paying attention to the saponification degree and polymerization degree of polyvinyl alcohol used for the inner recording layer close to the support and the outer recording layer formed on the outer surface, water resistance of the coating film, print image quality, storage It has been proposed to balance properties, image uniformity, glossiness, and coating defects during coating. In this case, the surface quality is good to some extent, but it is still at an insufficient level.
JP 2000-238420 A Japanese Patent Laid-Open No. 2004-243687

  An object of the present invention is to provide an ink jet recording material having a very good surface quality and little powder falling off during guillotine cutting.

The above object of the present invention has been basically achieved by the following invention.
That is, in an ink jet recording material in which one or more ink receiving layers are laminated on at least one side of a support and a glossy expression layer is laminated on the ink receiving layer by a casting method, the ink receiving layer adjacent to the glossy expression layer is a pigment. A binder and a cationic resin, the average secondary particle size of the pigment is 3 to 6 μm, the oil absorption is 210 to 330 ml / 100 g, and the binder is polyvinyl alcohol having a saponification degree of 99.9% or more. 30 to 70% in terms of pigment mass ratio, containing a polyamidine compound as the cationic resin.

  The ink jet recording material of the present invention has a very good surface quality, and has little powder falling off when guillotine is cut.

  The ink jet recording material of the present invention will be described in detail below.

  In the present invention, it is important that the pigment contained in the ink receiving layer has an average secondary particle size of 3 to 6 μm and an oil absorption of 210 to 330 ml / 100 g. If the average secondary particle size is less than 3 μm, the coating strength of the ink receiving layer is low, and good surface quality cannot be obtained when a glossy layer is applied. On the other hand, if the thickness exceeds 6 μm, the surface of the ink receiving layer becomes rough, and the surface quality when the glossy layer is applied is poor.

  If the oil absorption amount is less than 210 ml / 100 g, the ink absorbability of the ink receiving layer is deteriorated, and the print image quality is adversely affected. Further, when the amount exceeds 360 ml / 100 g, the absorbed binder component increases, resulting in a decrease in the coating strength of the ink receiving layer, and when the cast layer is coated with a glossy expression layer, a coating layer is formed on the cast drum surface. A good surface cannot be obtained due to adhesion.

  In addition, when polyvinyl alcohol having a saponification degree of 99.9% or more as a binder is less than 30% in terms of the mass ratio to the pigment, the coating layer strength becomes weak and powder falling off during guillotine cutting becomes a problem. On the other hand, if it exceeds 70%, the powder falling becomes good, but the ink absorptivity deteriorates.

  It is important that what is contained as the cationic resin is a polyamidine compound. The reason is not clear, but when other cationic resins are used, the coating liquid flows on the cast drum when the glossy expression layer is coated on the ink receiving layer and cast, resulting in good surface quality. I can't get it.

  The average secondary particle diameter of the pigment in the present invention is measured by a Coulter counter method.

  The air resistance after coating and drying the ink receiving layer in the present invention is preferably 400 sec / 100 cc or less. When the air permeation resistance exceeds 400 sec / 100 cc, there is a case where the escape layer of steam generated by drying may be lost when the glossy layer is coated and cast, and in the worst case, the coating layer bursts. It becomes.

  In the present invention, it is preferable to set the opacity measured by the method defined in JIS P8138 to 94% or more, since the printing on the opposite side can not be seen through and a good ink jet recording material can be obtained.

  When the opacity is less than 94%, the printing on the front and back surfaces influence each other, and as a result, the appearance of the printed matter tends to be significantly impaired.

  By setting the whiteness measured by the method defined in JIS P8148 of the ink jet recording material of the present invention to 84% or more, the image portion by the ink jet printing method becomes sharp. When the whiteness is less than 84%, the boundary between the image portion and the non-image portion is blurred, and high-quality printing at the corners tends to be spoiled. In the ink jet recording system, “white” can be expressed only for the white paper of the non-image area of the ink jet recording material.

  In the ink jet recording material of the present invention, the ink receiving layer adjacent to the gloss developing layer contains other pigments in addition to the pigment, binder, and cationic resin as long as the effects of the present invention are not impaired. Or a binder resin or the like. In addition, pigment dispersants, thickeners, fluidity improvers, surfactants, antifoaming agents, foam suppressants are added to the ink receiving layer adjacent to the gloss developing layer and the ink receiving layer not adjacent to the gloss developing layer. Agent, mold release agent, foaming agent, penetrating agent, coloring dye, coloring pigment, fluorescent whitening agent, UV absorber, antioxidant, preservative, antibacterial agent, water resistant agent, wet paper strength enhancer, dry paper A force enhancer or the like can be appropriately blended.

  The ink-receiving layer that is not adjacent to the glossy layer in the present invention is preferably composed of a coating composition mainly composed of a pigment and a binder. In the present invention, one or more known white pigments can be used as the pigment used for the ink receiving layer and the support that are not adjacent to the glossy layer. For example, light calcium carbonate, heavy calcium carbonate, kaolin, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, zinc carbonate, satin white, aluminum silicate, diatomaceous earth, calcium silicate, magnesium silicate, synthetic non White inorganic pigments such as crystalline silica, colloidal silica, colloidal alumina, pseudoboehmite, aluminum hydroxide, alumina, lithopone, zeolite, hydrohalloysite, magnesium carbonate, magnesium hydroxide, styrene plastic pigment, acrylic plastic pigment, polyethylene, Organic pigments such as microcapsules, urea resins, and melamine resins can be used. Among the above-mentioned pigments, porous inorganic pigments are preferable, and examples thereof include porous magnesium carbonate and porous alumina. Pigments having a large pore volume are particularly preferable.

  In the present invention, it is also possible to use inorganic ultrafine particles as a pigment used in the ink receiving layer and the support that are not adjacent to the glossy layer. The inorganic ultrafine particles in the present invention are inorganic fine particles having a primary particle diameter of 100 nm or less. For example, JP-A-1-97678, 2-275510, 3-281383, 3-285814, 3-285815, 4-92183, 4-267180 Pseudo boehmite sols proposed in Japanese Laid-Open Patent Publication No. 4-27517, etc., Japanese Patent Laid-Open Nos. 60-219083, 61-19389, 61-188183, 63-178074, Colloidal silica as described in JP-A-5-51470, etc., silica / alumina hybrid sol as described in JP-B-4-19037, JP-A-62-2286787, JP-A-10-119423 High-speed homogenization of ultrafine silica as described in JP-A-10-217601. Typical examples include smectite clays such as silica sol, hectite, and montmorillonite (JP-A-7-81210), zirconia sol, chromia sol, yttria sol, ceria sol, iron oxide sol, zircon sol, antimony oxide sol, etc. As mentioned. Gas phase method silica can also be used.

  Examples of the binder contained in the ink receiving layer not adjacent to the glossy layer of the present invention include starch derivatives such as oxidized starch, etherified starch, and phosphate esterified starch; cellulose derivatives such as carboxymethylcellulose and hydroxyethylcellulose; casein Conjugated diene copolymer latex such as gelatin, soybean protein, polyvinyl alcohol, various modified polyvinyl alcohols, polyvinyl pyrrolidone, maleic anhydride resin, styrene-butadiene copolymer, methyl methacrylate-butadiene copolymer; Acrylic copolymer latex such as a polymer or copolymer of methacrylic acid ester; Vinyl copolymer latex such as ethylene-vinyl acetate copolymer; or carboxy group of these various copolymers Functional group-modified copolymer latex with functional group-containing monomers; aqueous adhesives such as thermosetting synthetic resins such as melamine resins and urea resins; polymers or copolymers of acrylic acid esters and methacrylic acid esters such as polymethyl methacrylate Combined resin: polyurethane resin, unsaturated polyester resin, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral, alkyd resin latex and the like.

The coating amount of the ink receiving layer is preferably determined based on the ink absorption capacity of the ink receiving layer and the adhesive strength between the ink receiving layer and the support that can withstand practical use, and the dry coating amount is 2. A range of 5 to 40 g / m ² is preferable. If the dry coating amount is less than 2.5 g / m ² , it is difficult for the coating layer that is an ink receiving layer to completely cover the support surface, and the ink absorption by the coating layer is not sufficient, Absorption unevenness may occur, which may adversely affect ink jet printing performance. Further, when the dry coating amount exceeds 40 g / m ² , the adhesion strength between the ink receiving layer and the support tends to be unacceptable for practical use, and the coating layer is peeled off from the support, which is called powder falling. May cause serious problems.

  As an ink jet recording material in the present invention, a coating layer may be provided on a support, and the coating layer may be used as an ink receiving layer as it is without post-treatment. The surface roughness may be controlled. Specific examples of the calendar include an embossed calendar, a machine calendar, a TG calendar, a super calendar, and a soft calendar. However, the calendar is not limited thereto, and the selection of the calendar may be appropriately performed depending on the material related to the surface structure of the sheet. .

  The glossy layer in the present invention is preferably composed of a coating composition containing colloidal particles and a binder as main components. The colloidal particles according to the present invention are those which are suspended and dispersed in water to form a colloidal shape. For example, alumina sol such as colloidal silica, boehmite, pseudoboehmite, etc., colloidal alumina, cationic aluminum oxide or hydrate thereof, or colloidal silica particle surface as disclosed in Japanese Patent Publication No. 47-26959 is alumina. Inorganic particles such as coated particles, conjugated diene copolymers such as polystyrene, methyl methacrylate, styrene-butadiene copolymer, methyl methacrylate-butadiene copolymer, polymers or copolymers of acrylic acid esters and methacrylic acid esters Organic polymer fine particles such as microcapsules, urea resins, and melamine can be used, and two or more of these can be used in combination.

  In the present invention, the glossy layer can use one or more known white pigments in combination with colloidal particles. Since the white pigment generally has a large particle size and causes opacity, the mass ratio of the colloidal particles / the white pigment is 80/20 or more, more preferably 90/10 or more, depending on the particle size of the white pigment. It is.

  Further, the binder used in the glossy layer includes starch derivatives such as oxidized starch, etherified starch and phosphate esterified starch, cellulose derivatives such as carboxymethylcellulose and hydroxyethylcellulose, casein, gelatin, soy protein, polyvinyl alcohol or the like. Derivatives, polyvinyl pyrrolidone, maleic anhydride resins, styrene-butadiene copolymers, conjugated diene copolymer latexes such as methyl methacrylate-butadiene copolymers, polymers or copolymers of acrylates and methacrylates, etc. Acrylic polymer latex such as acrylic polymer, vinyl polymer latex such as ethylene vinyl acetate copolymer, or functional group-modified polymer latex with functional group-containing monomers such as carboxyl groups of these various polymers , Water-based adhesives such as thermosetting synthetic resins such as lamin resins and urea resins, polymers or copolymer resins of acrylic acid esters and methacrylic acid esters such as polymethyl methacrylate, polyurethane resins, unsaturated polyester resins, vinyl chloride-acetic acid Examples thereof include synthetic resin adhesives such as vinyl copolymer, polyvinyl butyral, and alkyd resin.

  The blending amount of the binder contained in the glossy expression layer is 5 to 70 parts by mass, preferably 5 to 50 parts by mass, with respect to 100 parts by mass of the pigment. Is insufficient, and if it exceeds 70 parts by mass, the ink absorbability decreases.

  Furthermore, in the glossy layer, as additives, dye fixing agents, pigment dispersants, thickeners, fluidity improvers, antifoaming agents, foam suppressors, mold release agents, foaming agents, penetrating agents, colored dyes, Coloring pigments, fluorescent whitening agents, ultraviolet absorbers, antioxidants, preservatives, antibacterial agents, water resistance agents, wet paper strength enhancers, dry paper strength enhancers, and the like can be appropriately blended.

Examples of the coating device for the glossy layer include various blade coaters, roll coaters, air knife coaters, bar coaters, rod blade coaters, curtain coaters, short dwell coaters, and size presses. The coating amount of the glossy layer varies depending on the smoothness and size of the ink receiving layer and the required gloss, but it may be ² g / m ² or more. Further, after applying the gloss developing layer, it is possible to correct the curl by spraying humidified air and humidified steam on the back surface of the gloss developing layer with the support interposed therebetween.

The coating amount of the glossy layer is preferably 5 to 30 g / m ² , since good surface quality and high ink absorbability can be obtained. More preferably, it is 5-20 g / m < ² >.

  In the present invention, the gloss developing layer is cast. As the casting treatment, there are a direct method, a rewet method, a coagulation method, and the like, but in the present invention, the coagulation method is preferably used, and the intended purpose of the present invention is further enhanced by coagulating the glossy layer. Achieved at a high level.

  The coagulation method is a processing method in which a recording layer coated on a support is treated with a coagulating liquid when it is in a fluid state and gelled. The gelated recording layer is heated and cast. Pressed against the drum and dried. The coagulation liquid contains a coagulant. Examples of the coagulant include salts with sodium, potassium, calcium, magnesium, barium, zinc, lead, cadmium, ammonium, etc. such as formic acid, acetic acid, citric acid, tartaric acid, lactic acid, hydrochloric acid, sulfuric acid, carbonic acid, and boric acid, Examples thereof include borax and various borates, and one or more can be selected and used. The concentration of the coagulant in the coagulation liquid is preferably in the range of 0.5 to 6% by mass in terms of anhydride, more preferably 1 to 5% by mass.

  In the coagulation liquid, as additives, for example, pigment dispersants, water retention agents, thickeners, antifoaming agents, antiseptics, colorants, water resistance agents, wetting agents, plasticizers, fluorescent dyes, ultraviolet absorbers, Known auxiliary agents such as antioxidants can be added as appropriate.

  The support in the present invention is a support having air permeability, such as chemical pulp such as LBKP and NBKP, mechanical pulp such as GP, PGW, RMP, TMP, CTMP, CMP, CGP, and wood such as waste paper pulp such as DIP. Pulp or non-wood pulp such as kenaf, bagasse, cotton, etc. as main components, conventionally known pigments, binders, sizing agents, fixing agents, yield improvers, cationizing agents, paper strength enhancers, toning dyes, etc. It is preferable to use a base paper produced by mixing various types of additives and using various devices such as a long paper machine, a circular paper machine, and a twin wire paper machine. A coat layer is provided on the base paper. It is also possible to use coated paper such as art paper, coated paper and cast coated paper. Such a base paper and coated paper may be provided with an ink receiving layer as they are, or a calendar device such as a machine calendar, a TG calendar, or a soft calendar may be used to control flattening.

Although the basic weight of the support body of this invention is not specifically limited, It is 50-350 g / m < ² >. In consideration of transportability, paper passing property, and the like in the printer device, it is particularly preferably 70 to 270 g / m ² .

  Examples of the present invention will be described below, but the present invention is not limited to these examples. In the examples and comparative examples, “parts” and “%” indicate parts by mass and mass% unless otherwise specified. In addition, the number of parts shown in the blend is the number of substantial components.

<Production of support>
A mixture of 50 parts of hardwood bleached kraft pulp (LBKP, whiteness 90%) and 50 parts of softwood bleached sulfite pulp (NBSP, whiteness 90%) was beaten to 350 ml with Canadian Standard Freeness to prepare a pulp slurry. Add 6 parts of talc as a filler, 0.5 part of alkyl ketene dimer as a sizing agent, 1.0 part of polyacrylamide and 2.0 parts of cationized starch as a dry paper strength enhancer, and dilute with water to make a 1% slurry. It was. This slurry was made with a long paper machine so as to have a basis weight of 150 g / m ² to prepare a support. On one side of this support, coating liquid A as an ink receiving layer was applied and dried by an air knife coater so that the coating amount after drying was 10 g / m ^2, and on the ink receiving layer thus obtained. The coating layer B of the glossy layer was applied using an air knife coater so that the coating amount after drying was 10 g / m ^2, and the coated surface was fluidized while being coated, The ink-jet recording material of Example 1 was obtained by performing a casting process by a solidification method in which it was pressed against a cast drum heated to 100 ° C. and dried.

<Ink-receiving layer coating liquid A>
Formulation (The following are all solid content indications)
Caustic soda 2 parts Synthetic amorphous silica (average secondary particle size 3.8 μm, oil absorption 240 ml / 100 g) 100 parts Optical brightener 0.05 parts Polyvinyl alcohol (AT (degree of saponification 99.9% or more, degree of polymerization) 1700) / Nippon Vinegar (Poval) 50 parts Cationic resin 1 (Polyamidine compound Himax SC-700 / Himo)
10 parts Cationic resin 2 (Smilease Resin SR-1001 / Sumitomo Chemical Co., Ltd.) 10 parts Acetylene glycol derivative 0.35 part is mixed with water and dispersed uniformly to form an ink receiving layer having a solid content of 15%. Liquid A was prepared.

<Glossy layer coating liquid B>
Cationized colloidal silica 50 parts Alumina hydrate (pseudoboehmite structure, average primary particle size 50 nm) 50 parts Cationic acrylic resin emulsion 10 parts Polyvinyl alcohol (PVA117, manufactured by Kuraray) 10 parts Release agent (nonionic oleic acid) Emulsion) 3 parts of water was mixed in water and uniformly dispersed to prepare a glossy layer coating liquid B having a solid content concentration of 20%.

<Adjustment of coagulation liquid>
A coagulation solution of 4% calcium formate (anhydrous equivalent) was prepared.

  Example 2 was the same as Example 1 except that the synthetic amorphous silica in the ink receiving layer coating liquid A of Example 1 was changed to one having an average secondary particle size of 4.0 μm and an oil absorption of 315 ml / 100 g. Inkjet recording material was obtained.

  Example 3 was the same as Example 1 except that the synthetic amorphous silica in the ink receiving layer coating liquid A of Example 1 was changed to one having an average secondary particle size of 6.0 μm and an oil absorption of 240 ml / 100 g. Inkjet recording material was obtained.

  Example 4 Exactly the same as Example 1 except that the synthetic amorphous silica in the ink receiving layer coating liquid A of Example 1 was changed to one having an average secondary particle size of 2.3 μm and an oil absorption of 280 ml / 100 g. Inkjet recording material was obtained.

(Comparative Example 1)
Ink jet of Comparative Example 1 in exactly the same manner as in Example 1 except that the synthetic amorphous silica in the ink receiving layer coating liquid A of Example 1 was changed to one having an average secondary particle size of 8 μm and an oil absorption of 240 ml / 100 g. A recording material was obtained.

(Comparative Example 2)
Ink jet of Comparative Example 2 in exactly the same manner as in Example 1 except that the synthetic amorphous silica in the ink receiving layer coating liquid A of Example 1 was changed to one having an average secondary particle size of 12 μm and an oil absorption of 230 ml / 100 g. A recording material was obtained.

(Comparative Example 3)
Comparative Example 3 was the same as Example 1 except that the synthetic amorphous silica in the ink-receiving layer coating liquid A of Example 1 was changed to one having an average secondary particle size of 2.7 μm and an oil absorption of 185 ml / 100 g. Inkjet recording material was obtained.

(Comparative Example 4)
Example 1 except that the synthetic amorphous silica in the ink receiving layer coating liquid A of Example 1 had an average secondary particle size of 1.7 μm and an oil absorption of 355 ml / 100 g, and the solid content concentration was adjusted to 12%. The inkjet recording material of Comparative Example 4 was obtained in the same manner as in Example 1.

(Comparative Example 5)
Example except that in the ink-receiving layer coating liquid A of Example 1, the synthetic amorphous silica had an average secondary particle size of 2.1 μm and an oil absorption of 115 ml / 100 g, and the solid content concentration was adjusted to 18%. The inkjet recording material of Comparative Example 5 was obtained in exactly the same manner as in Example 1.

(Comparative Example 6)
An ink jet recording material of Comparative Example 6 was obtained in exactly the same manner as in Example 1 except that the ink receiving layer coating liquid A of Example 1 was changed to 25 parts of polyvinyl alcohol.

(Comparative Example 7)
An ink jet recording material of Comparative Example 7 was obtained in exactly the same manner as in Example 1 except that the ink receiving layer coating liquid A of Example 1 was changed to 75 parts of polyvinyl alcohol.

(Comparative Example 8)
An inkjet recording material of Comparative Example 8 was obtained in exactly the same manner as in Example 1 except that polyvinyl alcohol was changed to that having a saponification degree of 98% and a polymerization degree of 1700 in the ink receiving layer coating liquid A of Example 1.

(Comparative Example 9)
An inkjet recording material of Comparative Example 9 was obtained in exactly the same manner as in Example 1 except that polyvinyl alcohol was changed to one having a saponification degree of 88% and a polymerization degree of 1700 in the ink receiving layer coating liquid A of Example 1.

(Comparative Example 10)
An inkjet recording material of Comparative Example 10 was obtained in exactly the same manner as in Example 1 except that polyvinyl alcohol was changed to one having a saponification degree of 88% and a polymerization degree of 3500 in the ink receiving layer coating liquid A of Example 1.

(Comparative Example 11)
An ink jet recording material of Comparative Example 11 was obtained in exactly the same manner as in Example 1 except that the cationic resin 1 was not added to the ink receiving layer coating liquid A of Example 1 and 20 parts of the cationic resin 2 was used. .

  As described above, the ink jet recording media produced in Examples and Comparative Examples were evaluated by the following evaluation methods, and the results are shown in Table 1.

<Coating layer strength>
Prepare each inkjet recording material prepared in Examples and Comparative Examples and cut into A4 plates, a JIS grade 1 metal ruler, a commercially available cutter, and a cutting mat (black is desirable). An ink jet recording material is set on a cutting mat, and a 5 cm length is shifted by using a cutter in a state where a metal scale is applied, and a cut is made 10 times. Thereafter, the powder of the coating layer generated at the time of cutting on the cutting mat was collected, and the degree thereof was visually evaluated according to the following criteria.
A: No coating powder is generated.
○: Slight coating powder is generated.
(Triangle | delta): Although coating layer powder generate | occur | produces, a change is not recognized by the coating layer surface of a notch part.
X: Coating powder is generated, and the coating layer surface at the cut portion is not limited to the original shape but is disturbed.
◎ to △ are within a practical range.

<Surface quality evaluation>
Recording materials cut into A4 plates were prepared, and the surface quality was visually observed under a white fluorescent lamp, and evaluated according to the following criteria. As for the size of the defect, the major axis was measured using a JIS standard first grade metal scale.
(Double-circle): The whole surface is exhibiting uniform gloss and there is no coating defect etc. at all.
○: Most of the surface exhibits uniform gloss, but there is one coating defect of 0.5 mm or less.
(Triangle | delta): Although a stripe-like gloss nonuniformity does not exist, there exist 2-3 coating defects of 0.5 mm or less.
X: There are streaky uneven glossiness, there are coating defects larger than 0.5 mm, or there are 4 or more coating defects of 0.5 mm or less.
◎ and ○ are ranges where there is no practical problem.

<Inkjet recording characteristics>
Using an inkjet printer (Canon PIXUS 950i), the inkjet recording material is a single color of black, cyan, magenta, and yellow, and double colors (red, green, and blue) with the other three colors except black ink. Solid printing was performed by a method in which 7-color solid patterns were recorded side by side in a horizontal line of 2 cm × 2 cm without gaps. Each color boundary portion of the printing portion was visually evaluated and judged according to the following criteria.
A: Each color that touches the boundary is separated by a clean line, and one color does not ooze out to the other color side.
○: The boundary of each color is not a clear line, but it can be identified, and one color does not ooze out to the other color.
(Triangle | delta): The boundary of each color is blurry, and one color has oozed slightly to the other color side.
X: The boundary of each color is not known, and the bleeding to the adjacent color is large.
◎ and ○ are ranges where there is no practical problem.

  As is apparent from the above results, according to the present invention, an ink jet recording material having a very good surface quality and little powder falling off during guillotine cutting can be obtained. On the other hand, it can be seen that the inkjet recording material of the comparative example cannot withstand practical use in terms of either surface quality or powder falling off during guillotine cutting.

Claims (1)

  In an ink jet recording material in which one or more ink-receiving layers are laminated on at least one side of a support and a gloss-expressing layer is laminated on the ink-receiving layer by a casting method, the ink-receiving layer adjacent to the gloss-expressing layer is a pigment, a binder And a pigment having an average secondary particle size of 3 to 6 μm, an oil absorption of 210 to 330 ml / 100 g, and a polyvinyl alcohol having a saponification degree of 99.9% or more as a binder. An ink jet recording material comprising a polyamidine compound as the cationic resin in a ratio of 30 to 70%.