JP2005138344A - Inkjet recording sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inkjet recording sheet which shows the outstanding fretting resistance/water resistance of an ink acceptance layer in a wet condition, the superb water resistance of an image while maintaining a high image quality as basic characteristics of a conventional inkjet recording sheet and successful dispersibility of an inorganic loading material in a coating liquid for molding the ink acceptance layer. <P>SOLUTION: In this inkjet recording sheet, the ink acceptance layer is formed on a base material and is a layer which is obtained by applying and drying a coating liquid for forming the ink acceptance layer containing (A) an inorganic loading material and (B) a binding agent containing a combination of (B1) a resin emulsion having a protective colloid which contains at least a complete saponification-type polyvinyl alcohol and (B2) a resin emulsion having a protective colloid which contains only a partial saponification-type polyvinyl alcohol. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an ink jet recording sheet, and more particularly to an ink jet recording sheet having excellent printing characteristics with an aqueous pigment ink.

As one of the printing methods, the inkjet recording method has advantages such as easy to obtain high-quality full-color images, easy speeding up, and low running costs. It is rapidly spreading in various fields such as copiers.
Along with this, printing quality such as moderate image density and prevention of image blurring is required for inkjet recording sheets. In addition, with the expansion of applications such as outdoor use, there is a demand for scratch resistance when the ink receiving layer is wet, water resistance of the ink receiving layer and images, and the like.
Conventionally, it has been proposed to use silica as a filler in an ink receiving layer and polyvinyl alcohol as a binder as an ink jet recording sheet having good print quality and water resistance (see, for example, Patent Document 1). However, these can obtain a certain degree of print quality and scratch resistance of the ink receiving layer, but this is not sufficient, and the water resistance of the ink receiving layer and the image is not sufficient.
In addition, the present inventor proposed using an emulsion of a resin containing silanol-modified polyvinyl alcohol in a protective colloid as a binder (Japanese Patent Application No. 2002-13236). According to this method, it is possible to obtain an image having excellent printing quality, scratch resistance of the ink receiving layer and water resistance of the ink receiving layer and the image.

However, in the practical production of products, the coating liquid is not applied immediately after blending, and is often stored with stirring so as to prevent sedimentation and hardening of components. This is because the coating liquid is prepared in advance so that it can be finely adjusted according to the temperature and humidity during use, or the composition and physical properties of the prepared coating liquid are analyzed. When the coating liquid is prepared and stored as usual by the method of the above-mentioned Japanese Patent Application No. 2002-12736, the coating liquid for forming the ink receiving layer is likely to aggregate even if it is stirred, and the dispersibility of the inorganic filler is insufficient. Therefore, there are restrictions on the management of the coating liquid, such as requiring coating immediately after the coating liquid is prepared.
As described above, the conventional ink receiving layer forming coating liquid maintains image quality such as image density and image blurring prevention, and has excellent scratch resistance when the ink receiving layer is wet. It was difficult to sufficiently satisfy the satisfactory inorganic filler dispersibility at the same time as being excellent in the water resistance of the image and without management restrictions.

JP 2002-144700 A (second page)

  Under such circumstances, the present invention maintains the image quality, which is a basic characteristic of conventional ink jet recording sheets, while maintaining the scratch resistance, water resistance, and image water resistance when the ink receiving layer is wet. An object of the present invention is to provide an ink jet recording sheet that is excellent in properties and has good dispersibility of the inorganic filler in the ink receiving layer forming coating solution.

As a result of intensive studies to achieve the above object, the present inventor has obtained a resin emulsion having a protective colloid containing a completely saponified polyvinyl alcohol and a protective colloid containing only a partially saponified polyvinyl alcohol. It has been found that the object can be achieved by using a combination of emulsions of resins having a resin as a binder in a coating liquid for forming an ink receiving layer.
The present invention has been completed based on such findings.

That is, the present invention
(1) A resin having an ink-receiving layer provided on a substrate, the ink-receiving layer having a protective colloid containing at least (A) an inorganic filler and (B) (B1) a completely saponified polyvinyl alcohol. And (B2) a coating solution for forming a receiving layer containing a binder component containing a combination of a resin emulsion having a protective colloid containing a polyvinyl alcohol containing only partially saponified polyvinyl alcohol, and drying. (2) (B) The solid content mass ratio of the component (B1) and the component (B2) in the binder component is 7: 3-1. The sheet for inkjet recording according to (1), wherein
Is to provide.

  According to the present invention, an ink is formed by combining a resin emulsion having a protective colloid containing a completely saponified polyvinyl alcohol as a binder and a resin emulsion having a protective colloid containing only a partially saponified polyvinyl alcohol. By using it as a coating liquid for forming a receiving layer, the dispersion of the inorganic filler in the coating liquid can be improved, and in terms of quality, the ink receiving layer is maintained while maintaining image quality such as image density and prevention of bleeding. Thus, an inkjet recording sheet excellent in scratch resistance, water resistance and image water resistance in a wet state can be obtained.

The ink jet recording sheet of the present invention has an ink receiving layer on at least one surface of a substrate.
In the present invention, the substrate may be in the form of a sheet and is not particularly limited. Any of those conventionally used for this type of purpose, such as plastic film, paper, and non-woven fabric, can be used, but a plastic film is particularly preferred from the viewpoint of water resistance.
Plastic film materials include general thermoplastic resins such as polyvinyl chloride, polyethylene terephthalate, polypropylene, polystyrene and polycarbonate, or those obtained by adding inorganic powder such as calcium carbonate to these resins, or organic pigments. It is possible to select from those added.
Furthermore, a biodegradable plastic film can also be used. The biodegradable plastic in the present invention is low in combustion energy, does not generate toxic gas, is metabolized by microorganisms in the natural environment and finally decomposed into water and carbon dioxide, and has a practical problem in the atmosphere. Although there is no particular limitation, it is preferable to use polylactic acid, starch / modified PVA mixture, polybutylene succinate / adipate copolymer, polycaprolactone, polyhydroxybutyrate. / Valylate copolymer. In particular, polylactic acid is preferable from the viewpoint of decomposition speed and strength. If necessary, other plastics can be added for the purpose of improving the strength within a range not impairing the biodegradability.

Furthermore, a foamed plastic film may be used. Here, the foamed plastic refers to a plastic film having cracks or notches, or fine bubbles or cavities on the surface or inside of the film. These bubbles and cavities are made of inorganic powder such as calcium carbonate. What is the name, formation method, or formation form of bubbles and cavities, such as those formed by stretching the contained film around the inorganic powder (microvoided film) or foamed by containing a foaming agent? Absent.
In addition, what is called a synthetic paper is also contained in the plastic film here.
Moreover, there is no restriction | limiting in particular also when using paper as a base material, High quality paper, medium quality paper, pulp paper, craft paper, art paper, coated paper, cast coated paper, etc. can be used.

  The substrate may be a single layer structure or a multilayer structure. Examples of a method for forming a multilayer structure include a method of bonding layers through an adhesive, and a method of extruding and joining a plurality of raw materials from a plurality of extruders. A film formed by any known method such as a so-called co-extrusion method or a so-called extrusion laminating method in which a film is directly laminated onto a film while extruding it directly from an extruder can be used.

  For the purpose of improving the adhesion and wettability with the ink receiving layer or the like, the base material can be subjected to surface treatment by an oxidation method, an unevenness method, or the like, if desired. Examples of the oxidation method include corona discharge treatment and hot air treatment. Examples of the unevenness method include a sand blast method and a solvent treatment method. These surface treatment methods are appropriately selected depending on the type of the substrate, but in general, the corona discharge treatment method is preferably used from the viewpoints of effects and operability. Moreover, what is called an easily bonding process which provides the anchor coat layer which touches a base material and an ink receiving layer can also be performed.

In the present invention, the ink receiving layer provided on at least one surface of the substrate uses the inorganic filler of the component (A) as an essential component as a filler.
In this case, examples of the inorganic filler that can be used include silica, calcium carbonate, talc, clay, diatomaceous earth, aluminum hydroxide, titanium oxide, calcined kaolin, hydrous magnesium silicate, and the like. These can be used alone or in combination.
Among the inorganic fillers, silica is particularly preferable. There is no restriction | limiting in particular as a kind of silica, Any of a gel type, a sedimentation type, and a fumed type may be sufficient.
The average particle diameter of silica is preferably 3.0 μm or more as measured by a Coulter counter method from the viewpoint of ink absorbability of the aqueous pigment ink. The average particle diameter is an average secondary particle diameter obtained from a particle diameter corresponding to a point where the volume fraction of the cumulative particle size curve obtained by the Coulter counter method is 50%.
Further, the silica particle size distribution (d10 / d90) is preferably 0.15 or more from the viewpoints of suppression of silvering after lamination, strength of the ink receiving layer, and the like.
Here, d10 of the silica particle size distribution means the maximum particle size when the cumulative volume becomes 10% of the total, starting from the smaller particle size, and d90 is from the smaller particle size. It means the maximum particle diameter when the accumulated volume becomes 90% of the total, and the particle size distribution d10 / d90 here is the value of d10 divided by the value of d90. The particle diameter can be measured by a laser diffraction / scattering method.

As the filler, only the inorganic filler of the component (A) may be used, but an organic filler may be mixed and used as long as the effect of the present invention is not impaired. In that case, usable fillers include polystyrene, polymethacrylate and the like. These can be used alone or in combination. However, it is preferable that the inorganic filler is 90% or more with respect to the total filler in terms of solid content mass ratio.
In general, the content of the filler in the ink receiving layer is preferably in the range of 40 to 80% by mass in terms of the total solid mass ratio of the ink receiving layer. By setting the filler content within this range, it is possible to maintain excellent ink absorptivity and ink receiving layer strength.

Furthermore, in the present invention, the ink-receiving layer includes an emulsion of a resin having a protective colloid containing (B1) a completely saponified polyvinyl alcohol as a binder component (B) together with the component (A), and (B2) A combination of a resin emulsion having a protective colloid containing only partially saponified polyvinyl alcohol is used as an essential component.
In the present invention, the completely saponified polyvinyl alcohol refers to those having a degree of saponification exceeding 95 mol%, and the partially saponified polyvinyl alcohol refers to those having a saponification degree of 95 mol% or less. Point to. The fully saponified and partially saponified polyvinyl alcohol compounds in the present invention include, in addition to polyvinyl alcohol, for example, silanol modified polyvinyl alcohol, carboxyl group modified polyvinyl alcohol, acetoacetyl group modified polyvinyl alcohol, cation modified polyvinyl alcohol, mercapto group Containing polyvinyl alcohol or the like may be used. Among these, use of silanol-modified polyvinyl alcohol is preferable because the strength of the ink receiving layer can be improved.

The content of the completely saponified polyvinyl alcohol in the protective colloid in the component (B1) is preferably 5 to 50% by mass, particularly preferably 7 to 40% by mass. When the content of the completely saponified polyvinyl alcohol is within the above range, the ink receiving layer itself can have good strength as a coating layer and good color developability upon printing.
On the other hand, the content of the partially saponified polyvinyl alcohol in the protective colloid in the component (B2) is preferably 98 to 100% by mass, particularly preferably 100% by mass. If the partially saponified polyvinyl alcohol is within the above range, the inorganic filler can be kept in a well dispersed state over time in the prepared coating solution.
A method for producing an emulsion of a resin having a protective colloid is not limited, but the emulsion can be produced by using a water-soluble polymer instead of a surfactant as an emulsifier during the polymerization reaction of a water-insoluble polymer.
Examples of the component forming the protective colloid in the present invention include water-insoluble polymer oligomers, starches, water-soluble cellulose derivatives and the like in addition to fully saponified polyvinyl alcohol and partially saponified polyvinyl alcohol.

On the other hand, the resin serving as the nucleus of the protective colloid is not particularly limited, and examples thereof include acrylic acid ester resins, styrene-acrylic copolymer resins, and ethylene-vinyl acetate copolymer resins. Among these, acrylic ester resins are preferable because they have an effect of improving light resistance.
The content of the protective colloid in the emulsion is preferably 5 to 30% by mass. If the content of the protective colloid is within this range, a stable emulsion can be obtained and the water resistance of the ink receiving layer can be improved.
The Tg of the resin material composition, which is a binder component constituting this emulsion, is preferably 0 ° C. or lower in consideration of the film forming property and anti-curl property of the coating layer. Further, the ionicity of the emulsion is preferably nonionic or cationic. Considering miscibility with water-soluble cationic substances, it is weakly cationic.

The polyvinyl alcohol in the protective colloid in the component (B2) is all partially saponified and needs to be free of completely saponified polyvinyl alcohol. The range of the preferable saponification degree of the partially saponified polyvinyl alcohol in the protective colloid in the component (B2) is 86 to 90 mol%.
Moreover, 7: 3 to 1: 9 are preferable and, as for the solid content mass ratio of (B1) component and (B2) component, More preferably, it is the range of 4: 6 to 3: 7.

As the binder, only the component (B1) and the component (B2) may be used, but other binders may be mixed and used as long as the effects of the present invention are not impaired. In that case, usable binders include, for example, polyvinyl alcohol, polyvinyl butyral, gelatin, polyvinyl acetal, carboxymethyl cellulose, polyvinyl pyrrolidone, polyester, acrylic resin, polyurethane, chlorinated polypropylene, polyversaic acid vinyl, Examples include copolymers, styrene-acrylic copolymers, ethylene-vinyl acetate copolymers, and styrene-butadiene rubbers.
Among these, polyvinyl alcohol is preferable, and completely saponified polyvinyl alcohol and silanol-modified polyvinyl alcohol are more preferable because the water resistance of the coating layer is less decreased.
Furthermore, a completely saponified polyvinyl alcohol having a degree of polymerization of 1000 or more is particularly preferred from the viewpoint of the water resistance, strength and color developability of the coating layer. These binders may be used singly or in combination of two or more.

In general, the content of the total binder in the ink receiving layer is preferably in the range of 20 to 50% by mass in terms of the total solid mass ratio of the ink receiving layer. By setting the total binder content within this range, excellent ink absorbability and strength of the ink receiving layer can be maintained, and dispersion of the ink receiving layer forming coating liquid is improved.
However, the proportion of the (B1) + (B2) component in all the binders is suitably 50% by mass or more.

In the present invention, a cationic resin, a water-soluble aluminum salt, and a hydrated aluminum oxide can be added as necessary to the ink receiving layer containing such filler and binder.
Examples of such cationic resins include polyethyleneimine, polyvinylpyridine, polyvinylamine, monoallylamine hydrochloride polymer, diallylamine hydrochloride polymer, monoallylamine hydrochloride-diallylamine hydrochloride copolymer, (meth) acrylamide. Polymer of alkyl quaternary ammonium salt, polyalkylene polyamine dicyandiamide condensate, addition polymer of secondary amine and epihalohydrin, polyepoxyamine, polydimethyldiallylammonium chloride, polyallylamine hydrochloride, allylamine-diallylamine copolymer, (Meth) acrylamide-diallylamine copolymer, epichlorohydrin polyamide, polydialkylaminoethylacrylamide, dicyandiamidepolyethyleneamine and polydimethylamino It may include compounds such as ammonium epichlorohydrin. These cationic resins are preferable for improving color developability, image density, and ink bleeding prevention performance.
The content of the cationic resin in the ink receiving layer is not particularly limited in terms of the total solid content mass ratio of the ink receiving layer, but is usually preferably in the range of 1 to 10% by mass. If the content of the cationic resin is within the above range, it is possible to maintain characteristics such as color developability, anti-bleeding property, water resistance, light resistance and ink absorbability.

Next, examples of the water-soluble aluminum salt include basic aluminum lactate and aluminum sulfate. A water-soluble aluminum salt is preferable for improving water resistance, color development, and bleeding prevention performance.
Although there is no restriction | limiting in particular in content of the water-soluble aluminum salt in an ink receiving layer, Usually, the range of 1-5 mass% is preferable at the ink-receiving layer total solid content mass ratio. When the content of the water-soluble aluminum salt is within the above range, the above effects are exhibited and the ink absorbability is also good.

Further, the hydrated aluminum oxide can improve the water resistance of the ink receiving layer, the bleeding prevention performance, and the color development.
Although there is no restriction | limiting in particular in content of the hydrated aluminum oxide in an ink receiving layer, Usually, the range of 1-8 mass% is preferable at an ink receiving layer total solid content mass ratio. When the content of the hydrated aluminum oxide is in the above range, the above-described effect is exhibited and the occurrence of curling can be suppressed.

In the ink receiving layer, an antifoaming agent, an antistatic agent, an ultraviolet absorber, a fluorescent whitening agent, a preservative, a pigment dispersant, a thickener, etc. These additives can be contained, and can be applied by being contained in a coating liquid for forming an ink receiving layer.
The thickness of the ink receiving layer is preferably from 15 to 60 μm, particularly preferably from 20 to 50 μm. If the thickness is within the above range, the ink absorbability is good and the strength of the ink receiving layer is sufficient.

The inkjet recording sheet having a base material and an ink receiving layer of the present invention has an ink receiving layer on at least one surface of the base material, and the ink receiving layer may be provided on one side of the base material. It may be provided on both sides for the purpose of prevention. The ink receiving layer used in the present invention may be provided in two or more layers on one surface of the substrate for the purpose of preventing cracks.
Furthermore, layers other than the ink receiving layer may be provided. For example, an anchor coat layer may be provided between the ink receiving layer and the substrate for the purpose of improving the adhesion. Further, for the purpose of improving the concealing property, a layer having appropriate opacity may be provided, or an ultraviolet absorbing layer may be provided. Further, a layer for preventing curling may be provided.

The ink receiving layer of the ink jet recording sheet of the present invention can be formed as follows.
The ink receiving layer, the anchor coat layer, etc. can be formed by dispersing necessary components or applying a dissolved coating solution and drying it. Various conventionally known methods such as gravure coating and blade coating can be used.

  In the present invention, an excellent effect is exhibited for both a water-based pigment ink and a water-based dye ink as a coloring material. In particular, the effect is great for aqueous pigment inks. Also suitable for oil-based pigment inks and solvent-based pigment inks.

EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by these examples.
The performance of the inkjet recording sheet was evaluated according to the following method. For printing, a pigment type ink jet printer (model name: MC9000) manufactured by Seiko Epson Corporation was used, and pure pigment type ink was used as the ink.
Regarding the images, the following two types of images were printed.
Type A
Colors used: Cyan, magenta, yellow, black, light cyan, light magenta, and mixed color (cyan, magenta and yellow) black images: Single color solid print, JIS high-definition color digital standard image N3A,
Type B
Color used: Black Image: Single color solid print

(1) Image chromaticity The above type A image was printed, and the reflection density, blurring, banding, and color were comprehensively observed visually, and evaluated according to the following criteria.
◎ ・ ・ ・ No problem, good ○ ・ ・ ・ Slight banding, but no problem for practical use × ・ ・ ・ Smooth, practical problem (2) Water resistance (dropping) of image
The above type A image was printed, and 5 minutes after the completion of printing, one drop of distilled water was dropped on the printing portion with a dropper, and the degree of ink spillage when the distilled water was completely absorbed was visually observed.
◎ ・ ・ ・ No spill ○○ Slight spill occurred but no problem in practical use ・ ・ ・ Spill out and practical problem (3) Scratch resistance when ink receiving layer is wet enough The surface of the inkjet recording sheet was rubbed with a wet cotton swab so that the load was 0.98 N. The ink receiving layer was rubbed until it was detached, and the number of times required for it was examined. However, one round trip (about 50 mm for one way) was counted as one time.
(4) Adhesive strength A cellophane tape (“CT405A-18” manufactured by Nichiban Co., Ltd., 10 cm in length) is applied to the ink receiving layer by reciprocating 3 times a 19.6 N pressure roll, and peeled in the direction of reversing at an angle of 45 °. The following criteria evaluated the peeling condition at the time of doing.
○ …… The area of the coating layer adhering to the cellophane tape is 30% or less Δ …… The area of the coating layer adhering to the cellophane tape is more than 30% to 60% or less × …… The area of the coating layer adhering to the cellophane tape (5) Dispersibility of the inorganic filler in the coating liquid for forming the ink receiving layer 200 g of the coating liquid for forming the ink receiving layer of each example and comparative example was sampled and placed in a beaker. It was stored for 5 days while stirring at 300 rpm with a stirrer as in production. Thereafter, each coating solution was applied to a substrate and dried to form an ink receiving layer. The above type B images were printed on these, and the presence or absence of uneven printing was visually observed.
○ ・ ・ ・ No unevenness × ・ ・ ・ Unevenness If the dispersion stability of the inorganic filler is poor, the inorganic filler aggregates over time in the coating solution even if it is stored with stirring. When applied, printing unevenness called white spots tends to occur. The degree of dispersibility in the coating liquid of the inorganic filler can be compared more clearly from the presence or absence of this printing unevenness.

Example 1
As a base material, a white foamed polypropylene film (microvoid film) [manufactured by YUPO Corporation, trade name: YUPO FPG # 80] having a thickness of 80 μm was used.
As the anchor coat layer coating solution, a mixture of the following components was used.
(A) Acrylic resin [manufactured by BASF Dispersion Co., Ltd., trade name: Acronal YJ-6221D, solid content concentration 49% by mass, anionic] 60 parts by mass (b) calcium carbonate [manufactured by Shiroishi Chuo Laboratory Co., Ltd., trade name: Callite SA, solid concentration 100% by mass, aragonite] 10 parts by mass (c) 30 parts by mass of water As a coating liquid for the ink receiving layer, a mixture of the following components was used.
(A) Filler * Silica [manufactured by Mizusawa Chemical Co., Ltd., trade name: Mizukasil P-50, solid content concentration 100% by mass] 35.75 parts by mass (b) Binder * [manufactured by Showa Polymer Co., Ltd. : OLZ-1390-8, containing protective colloid including completely saponified polyvinyl alcohol and partially saponified polyvinyl alcohol, solid content concentration 47.2% by mass, acrylic resin 83.8% by mass as the core of solid content, complete Saponified polyvinyl alcohol 1.3% by mass, partially saponified polyvinyl alcohol 14.7% by mass, other solid content 0.2% by mass] 8.71 parts by mass * [manufactured by Showa Polymer Co., Ltd., prototype name: OLZ -1220, containing a protective colloid containing partially saponified polyvinyl alcohol, solid content concentration 45.4% by mass, acrylic resin 83.8% by mass as a solid content core, partially saponified polyvinylvin 16% by mass of alcohol, 0.2% by mass of other solids] 19.54 parts by mass * polyvinyl alcohol [manufactured by Kuraray Co., Ltd., trade name: Kuraray Poval PVA-117, solid content of 100% by mass, completely saponified type] 5.64 parts by mass (c) Additive * Hydrated aluminum oxide [manufactured by Nissan Chemical Industries, trade name: alumina sol 200, solid content concentration 10% by mass] 5.50 parts by mass * Dicyandiamide condensate [Nikka Chemical Product name: Neofix E-117, solid content concentration 50% by mass] 8.36 parts by mass * basic aluminum lactate [manufactured by Taki Chemical Co., Ltd., product name: Taxanelam M-160L, solid content concentration 25% by mass 5.72 parts by weight An anchor coat layer coating solution is applied to one surface of the substrate so that the thickness after drying is 5 μm. After drying, ink is received on the anchor coat layer. The layers coating solution was coated so that the thickness after drying becomes 25 [mu] m, by drying, to prepare an ink jet recording sheet provided with an ink-receiving layer. Each evaluation result is shown in Table 1.

Example 2
As an ink-receiving layer coating solution in Example 1, “OLZ-1390-8” is * [manufactured by Showa Polymer Co., Ltd., prototype name: OLZ-1220-49, fully saponified polyvinyl alcohol and partially saponified type. Containing protective colloid containing polyvinyl alcohol, solid content concentration of 44.3% by mass, core acrylic resin 83.8% by mass, fully saponified polyvinyl alcohol 53% by mass, partially saponified polyvinyl alcohol 10.7% by mass The other solid content was 0.2% by mass, and the completely saponified polyvinyl alcohol was replaced with 13.38 parts by mass of silanol-modified polyvinyl alcohol.
Further, “Kuraray Poval PVA-117” was replaced with the following.
* Polyvinyl alcohol [made by Kuraray Co., Ltd., trade name: Kuraray Poval PVA-124, solid content concentration: 100% by mass, completely saponified type] 2.82 parts by mass * Polyvinyl alcohol [made by Denki Kagaku Kogyo Co., Ltd., trade name: DENKA POVAL K −17E, solid content concentration 100% by mass, complete saponification type] 2.82 parts by mass Other than that, the same operation as in Example 1 was performed to prepare an ink jet recording sheet. Each evaluation result is shown in Table 1.

Comparative Example 1
“OLZ-1220” was excluded as the ink receiving layer coating liquid in Example 1. Moreover, "OLZ-1390-8" was increased to 27.92 mass parts. Otherwise, the same operation as in Example 1 was performed to produce an ink jet recording sheet. Each evaluation result is shown in Table 1.

Claims (2)

  An ink-receiving layer provided on a substrate, the ink-receiving layer comprising: (A) an inorganic filler; and (B) (B1) a resin emulsion having a protective colloid containing at least saponified polyvinyl alcohol; (B2) formed by coating and drying a receiving layer forming coating solution containing a binder component containing a combination of emulsions of resins having protective colloids containing only partially saponified polyvinyl alcohol. An ink jet recording sheet comprising a layer. 2. The ink jet recording sheet according to claim 1, wherein the solid content mass ratio of the (B1) component and the (B2) component in the (B) binder component is 7: 3 to 1: 9.