JP2000141865A - Inkjet recording sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink jet recording sheet having good absorbency and high gloss. SOLUTION: In the ink jet recording sheet comprising at least one ink receptive layer and a gloss developing layer brought into pressure contact with a heated mirror surface roll of a wet state, dried and coated sequentially laminated on one surface of a support, a Beck smoothness of the receptive layer at the time of coating the developing layer is regulated to 30 to 150s or below. Following pigment or particles of one or more types an be used for the receptive layer. For example, white inorganic pigment such as light calcium carbonate, heavy calcium carbonate, magnesium carbonate, kaolin, talc, calcium sulfate, barium sulfate, synthetic noncrystalline silica, alumina, magnesium hydroxide, or organic pigment or the like such as styrene plastic pigment, acrylic plastic pigment, polyethylene, microcapsule, urea resin, melamine resin or the like can be used. Of them, as the pigment contained in the receptive layer, porous inorganic pigment is preferable, porous synthetic noncrystalline silica, porous magnesium carbonate, porous alumina or the like is used, or particularly porous synthetic noncrystalline silica having large pore volume is preferably used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glossy ink jet recording sheet applicable to a printer utilizing an ink jet recording system, and more particularly to a high gloss ink jet recording sheet having improved absorbency. is there.

[0002]

2. Description of the Related Art In an ink jet recording system, fine droplets of ink are caused to fly according to various operating principles and adhere to a recording sheet such as paper to record images and characters.
The recording method has features such as high speed, low noise, easy multi-coloring, great flexibility in recording patterns, and no need for development and fixing. It is rapidly spreading in applications. Furthermore, it is possible to obtain a record comparable to multi-color printing by multi-color ink jet or printing by a color photographic method, and it is less expensive than photographic technology in applications where the number of copies is small, so full color It is being widely applied to the image recording field.

Further, in the printer using the ink jet system, the resolution is increased and the color reproduction range is expanded in response to a demand for further improvement in image quality from the market. Along with this, it is indispensable for the inkjet recording sheet as a recording medium to secure a high ink receiving capacity for exhibiting excellent image quality and to apply a coating layer having good coloring properties. In addition, it has been demanded that appearance such as gloss, rigidity, hue and the like is similar to silver halide photographs and printing paper.

As an ink jet recording sheet having a high gloss, a method for producing an ink jet recording sheet by a casting process has been proposed. For example, JP-A-2-113986 discloses a method of casting after treatment with an aqueous solution containing a cationic polyelectrolyte, and JP-A-2-274587 discloses a method of using colloidal silica to improve gloss and using a cationic polymer. A method of casting after treating with an aqueous solution containing a molecular electrolyte has been proposed. However, the use of a cationic polymer electrolyte causes the surface of the printed portion to be roughened because the cationic polymer electrolyte present on the surface is re-dissolved in the ink when printing, and the gloss of the printed portion and the image The sharpness tends to decrease.

Japanese Patent Laid-Open No. 7-101142 discloses that
A method of calendering by applying a glossy layer composed of colloid particles and polymer latex on the ink receiving layer has been proposed. However, even in this method, high pressure calendering is required to obtain the desired high gloss. Is required, which causes a decrease in ink absorbency. For this reason, in the calendar processing, it is necessary to select conditions within the range of the allowable ink absorption capacity, and it is difficult to achieve both ink absorption and high gloss with the current technology. It is the current situation.

[0006]

SUMMARY OF THE INVENTION An object of the present invention to solve the above-mentioned problems is to provide a high gloss ink jet recording sheet having good absorbency.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above problems, and as a result, have reached the present invention.

[0008] Ink-jet recording in which at least one ink-receiving layer and a glossy layer which is coated by pressing and drying a heated mirror roll in a wet state are sequentially laminated on one side of a support. In the sheet, the Bekk smoothness of the ink receiving layer at the time of coating the glossy layer is 30 seconds or more and 15 seconds or more.
An invention of an ink jet recording sheet, wherein the time is 0 second or less.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.

[0010] The present invention is a high gloss ink jet recording sheet having good absorbency.

The present inventors press-contact at least one ink-receiving layer with a mirror roll heated in a wet state.
By adjusting the Beck smoothness of the ink receiving layer at the time of applying the glossy layer to a specific range in the ink jet recording sheet in which the glossy layer to be dried and applied is sequentially laminated, good absorbability can be obtained. And high gloss was obtained, and the present invention was completed.

In the ink receiving layer according to the present invention, one or more of the following pigments or particles can be used. For example,
Light calcium carbonate, heavy calcium carbonate, magnesium 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 amorphous silica, colloidal silica, alumina, alumina hydrate, aluminum hydroxide, lithopone, zeolite, hydrohalosite,
Examples include white inorganic pigments such as magnesium hydroxide and the like, organic pigments such as styrene-based plastic pigment, acrylic-based plastic pigment, polyethylene, microcapsules, urea resin, and melamine resin. Among the above, as the pigment contained as a main component in the ink receiving layer, a porous inorganic pigment is preferable, and porous synthetic amorphous silica, porous magnesium carbonate, porous alumina, and the like,
Particularly, a porous synthetic amorphous silica having a large pore volume is preferable.

[0013] The binder incorporated in the ink receiving layer according to the present invention includes starch derivatives such as oxidized starch, etherified starch, and phosphated starch; cellulose derivatives such as carboxymethyl cellulose and hydroxyethyl cellulose; casein, gelatin, and soybeans. Protein, polyvinyl alcohol or derivatives thereof; polyvinylpyrrolidone, maleic anhydride resin, styrene-butadiene copolymer, conjugated diene-based copolymer latex such as methyl methacrylate-butadiene copolymer; acrylate and methacrylate polymers Or a latex of an acrylic polymer such as a copolymer; a latex of a vinyl polymer such as an ethylene-vinyl acetate copolymer; or a polymer latex modified with a functional group-containing monomer such as a carboxy group of these various polymers Or this Various polymers were cationized using cationic groups, those cationized on a polymer surface with a cationic surfactant, polymerized under cationic polyvinyl alcohol, and the polyvinyl alcohol was distributed on the polymer surface. , A polymer in which a polymer is dispersed in a suspension of cationic colloid particles and the particles are distributed on the surface of the polymer; an aqueous binder such as a thermosetting synthetic resin such as a melamine resin or a urea resin; polymethyl methacrylate And methacrylic acid ester polymer or copolymer resin; polyurethane resin, unsaturated polyester resin, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral, alkyd resin and other synthetic resin binders. .

The compounding amount of the binder in the ink receiving layer is as follows:
It is 5 to 70 parts by weight, preferably 10 to 50 parts by weight, based on 100 parts by weight of the pigment. If the amount is less than 5 parts by weight, the coating strength of the ink receiving layer and the glossy layer is insufficient,
If the amount exceeds 70 parts by weight, the ink absorbency decreases, which is not preferable.

In the ink receiving layer, other additives such as a pigment dispersant, a thickener, a fluidity improver, a defoamer,
Foam inhibitors, release agents, foaming agents, penetrants, coloring dyes, coloring pigments, optical brighteners, ultraviolet absorbers, antioxidants, preservatives,
An anti-binder, a water-proofing agent, a dye fixing agent and the like can be appropriately blended.

The ink receiving layer is formed on or off by using various devices such as various blade coaters, roll coaters, air knife coaters, bar coaters, rod blade coaters, curtain coaters, short dwell coaters, and size presses. More than one layer is applied.

The coating amount of the ink receiving layer varies depending on the type and amount of the pigment or binder to be applied and the type of the ink jet recording apparatus, but is 2 g / m ² or more, preferably 4 g / m ² or more.
２０20 g / m ² .

After the ink receiving layer is applied and dried, the Bekk smoothness is 30 seconds or more and 150 seconds or more before the gloss expression layer is pressed against a heated mirror roll in a wet state and dried and applied. Machine calendar, T
A calendar device such as a G calendar, a soft calendar, or a super calendar may be used on-machine or off-machine. When the Bekk smoothness of the ink-receiving layer is less than 30 seconds, the gloss-developing layer is pressed against a heated specular roll in a wet state, and dried and applied. Adhesion is poor, and it is difficult to obtain high gloss, which is not preferable. If the Beck smoothness of the ink receiving layer exceeds 150 seconds, the air permeability becomes too poor,
When the glossy layer is applied while being pressed against a heated mirror roll while it is in a wet state, it causes blistering.
In addition, operability is significantly reduced, which is not preferable.

The following pigments or particles can be used in an appropriate combination in the gloss developing layer according to the present invention. For example, light calcium carbonate, heavy calcium carbonate, magnesium 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 amorphous silica, colloidal silica, alumina, alumina hydrate,
Examples thereof include white inorganic pigments such as aluminum hydroxide, lithopone, zeolite, hydrohalosite, and magnesium hydroxide, and organic pigments such as styrene plastic pigment, acrylic plastic pigment, polyethylene, microcapsules, urea resin, and melamine resin. Among the above, colloidal silica, alumina, and alumina hydrate are particularly preferable because they enhance the transparency of the glossy layer and increase the color development by distributing a large amount of ink in the surface layer.

Binders to be incorporated in the glossy layer include starch derivatives such as oxidized starch, etherified starch and phosphate esterified starch; cellulose derivatives such as carboxymethyl cellulose and hydroxyethyl cellulose; casein, gelatin, soy protein, polyvinyl Alcohols or derivatives thereof; conjugated diene-based copolymer latexes such as polyvinylpyrrolidone, maleic anhydride resin, styrene-butadiene copolymer, methyl methacrylate-butadiene copolymer; polymers or copolymers of acrylates and methacrylates Acrylic polymer latex such as coalesce; vinyl polymer latex such as ethylene-vinyl acetate copolymer; or functional group-modified polymer latex with functional group-containing monomer such as carboxy group of these various polymers; or Various polymerizations Cationized using a cationic group, a cationized polymer surface with a cationic surfactant, polymerized under cationic polyvinyl alcohol and the polyvinyl alcohol is distributed on the polymer surface, cationic Polymerization is performed in a suspension dispersion of colloidal particles, and the particles are distributed on the polymer surface; an aqueous binder such as a thermosetting synthetic resin such as a melamine resin or a urea resin; an acrylic acid such as a polymethyl methacrylate Ester; methacrylic acid ester polymer or copolymer resin; polyurethane resin, unsaturated polyester resin,
Synthetic resin binders such as vinyl chloride-vinyl acetate copolymer, polyvinyl butyral, and alkyd resin can be exemplified.

The amount of the binder in the glossy layer is
It is 5 to 70 parts by weight, preferably 10 to 50 parts by weight, based on 100 parts by weight of the pigment. If the amount is less than 5 parts by weight, the coating strength of the ink receiving layer and the glossy layer is insufficient,
If the amount exceeds 70 parts by weight, the ink absorbency decreases, which is not preferable.

In the glossy layer, other additives such as a pigment dispersant, a thickener, a flow improver, an antifoaming agent, a foam inhibitor, a release agent, a foaming agent, a penetrating agent, and a coloring agent. Dyes, coloring pigments,
A fluorescent whitening agent, an ultraviolet absorber, an antioxidant, an antiseptic, an antibacterial agent, a waterproofing agent, a dye fixing agent, and the like can also be appropriately compounded.

The glossy layer is applied by being pressed against a heated mirror roll in a wet state and dried. As a result, the mirror surface shape of the roll is transferred to the ink jet recording sheet, so that the smoothness of the surface becomes extremely high and a strong gloss is obtained. Further, since the linear pressure when pressing against the mirror roll is lower than when a calender is used, the pore volume of the gloss-developing layer is not significantly reduced, and good ink absorption is obtained. preferable.

The method of press-contacting and drying a heated mirror roll in a wet state according to the present invention is generally the same as the production method of a cast coated paper for printing, and includes a direct method, a coagulation method, and a rewet method ( Rewet method). The direct method is a method in which after a glossy layer is applied, the coated layer is pressed against a heated mirror roll in an undried state (wet state) and dried. The coagulation method is a method in which after a glossy layer is applied, the undried layer is coagulated with a coagulation liquid, and then pressed against a heated mirror-finished roll and dried. The rewet method is a method in which a gloss-developing layer is applied and dried, then the layer is rewet with a wetting liquid mainly composed of water, and pressed against a heated mirror surface to dry. The surface roughness, diameter, pressure (linear pressure) at the time of pressing and coating speed of the mirror roll according to the method can be appropriately selected in the same manner as the production conditions of commercially available cast-coated paper.

[0025] The coating amount of the glossy layer, the type and amount of pigment and binder to be applied may vary depending on the type of the ink jet recording apparatus, 2 g / m ² or more, preferably in the range of 4~20g / m ² It is.

The support used in the present invention includes LB
Chemical pulp such as KP, NBKP, GP, PGW, RM
Wood pulp such as mechanical pulp such as P, TMP, CTMP, CMP and CGP, waste paper pulp such as DIP, kenaf, etc.
Using non-wood pulp such as bagasse and cotton, and conventionally known pigments as main components, and using at least one kind of various additives such as a binder, a sizing agent, a fixing agent, a retention agent, a cationizing agent, and a paper strength agent. Mixing, fourdrinier, round net,
Base paper manufactured by various devices such as twin wire paper machine,
Further, the base paper includes a base paper having a size press with starch or polyvinyl alcohol or an anchor coat layer, and a coated paper such as an art paper, a coated paper, or a cast coated paper having a coat layer provided thereon. Such a base paper and a coated paper may be provided with the ink receiving layer according to the present invention as they are, or a calendar device such as a machine calendar, a TG calendar, or a soft calendar may be used for the purpose of controlling flattening. good. Further, as the basis weight of the support,
Usually, it is 40 to 300 g / m ² , but is not particularly limited.

The ink jet recording sheet according to the present invention is not limited to use as an ink jet recording sheet, but may be used as any recording sheet using a liquid ink at the time of recording. For example, a heat-fusible substance, a heat-fusible ink containing a dye, a pigment or the like as a main component is applied to a thin support such as a resin film, high-density paper, or synthetic paper, and an ink sheet is heated from the back surface thereof. Heat transfer recording image-receiving sheet for melting and transferring the ink, heat-fusible ink is heated and melted to form fine droplets, ink jet recording sheet for flight recording, ink jet recording sheet using ink in which oil-soluble dye is dissolved in solvent, light An image receiving sheet corresponding to a photosensitive pressure-sensitive donor sheet using microcapsules containing a polymerizable monomer and a colorless or colored dye or pigment is included.

The common feature of these recording sheets is that the ink is in a liquid state at the time of recording. The liquid ink permeates or spreads in the depth direction or the horizontal direction of the ink receiving layer of the recording sheet until it is cured, solidified or fixed.
The above-described various recording sheets require absorptivity according to each system, and the ink jet recording sheet of the present invention may be used as the above-described various recording sheets.

Further, the ink jet recording sheet of the present invention may be used as a recording sheet for heating and fixing an electrophotographic toner widely used in a copying machine, a printer, etc., or a label provided with an adhesive layer. It is also possible to use it for applications.

[0030]

EXAMPLES The present invention will be described below with reference to examples of the present invention, but the present invention is not limited to these examples.
Parts and% shown in Examples are parts by weight and% by weight unless otherwise specified.

<Preparation of Support> A base paper serving as a support was prepared as follows. LBKP (freeness 400mlcf
s) 90 parts and NBKP (freeness 450 mlcfs) 10
Parts of wood pulp consisting of 5 parts, 5 parts of light calcium carbonate, 0.1 part of a commercially available alkyl ketene dimer,
After preparing 0.05 part of a commercially available cationic polyacrylamide and 1.0 part of a commercially available cationized starch, the resultant was prepared using a fourdrinier paper machine to a basis weight of 125 g / m ² , and then subjected to an on-machine in-line size press. Commercially available oxidized starch was adhered on the apparatus to obtain a support having a basis weight of 127 g / m ² .

Example 1 An ink receiving layer was obtained by applying a coating composition containing a porous pigment as a main component on the support. The coating composition is a commercially available synthetic amorphous silica (Fine Seal X37) as a porous pigment.
B: 50 parts of Tokuyama Corporation, 50 parts of commercially available synthetic amorphous silica (Mizukasil P78D: manufactured by Mizusawa Chemical Co., Ltd.), and commercially available polyvinyl alcohol (PVA11) as a binder
7: manufactured by Kuraray Co., Ltd.). The solids content of the coating composition is 17%. The coating composition was applied on a support to an absolute dry weight of 10 g / m ² with an air knife coater and dried, and then on-machined so that the Beck smoothness of the ink receiving layer surface was 40 seconds. Machine calendering was performed to obtain an ink receiving layer.

For the measurement of Beck smoothness, a Beck smoothness meter manufactured by Kumagai Riki Kogyo Co., Ltd. was used, and in accordance with JIS P8119,
This is a value obtained by measuring the time required for 10 ml of air to pass.

Next, the coating composition was applied on the ink receiving layer applied on the support to obtain a gloss developing layer. The coating composition contained 50 parts of commercially available colloidal silica (Snowtex AK: manufactured by Nissan Chemical Industries, Ltd.) as a pigment and 50 parts of commercially available alumina sol (Cataloid AS-3: manufactured by Catalyst Kasei Co., Ltd.).
Parts, commercially available polyvinyl alcohol (P
VA117: Kuraray Co., Ltd.) and 1 part of a commercially available nonionic oleic acid emulsion as a release agent. The solid content concentration of the coating composition is 12%. The coating composition was applied on the ink receiving layer using an air knife coater so that the absolute dry coating amount was 5 g / m ^2, and the surface temperature was 100 ° C.
The ink-jet recording sheet of Example 1 was obtained by pressing against a mirror surface roll maintained at a temperature of 10 ° C. for 10 seconds and drying.

Example 2 An ink receiving layer was obtained by coating a coating composition containing a porous pigment as a main component on the support. The coating composition is a commercially available synthetic amorphous silica (Fine Seal X37) as a porous pigment.
B: 100 parts of Tokuyama Co., Ltd .; commercially available polyvinyl alcohol as a binder (PVA117: Kuraray Co., Ltd.)
40 parts were prepared and obtained. The solid content concentration of the coating composition is 1
7%. The coating composition was applied on a support to an absolute dry weight of 10 g / m ² using an air knife coater and dried. Then, the on-machine was applied so that the Beck smoothness of the ink receiving layer surface was 46 seconds. Machine calendering was performed to obtain an ink receiving layer.

Next, a gloss developing layer was applied on the ink receiving layer in the same manner as in Example 1 to obtain an ink jet recording sheet of Example 2.

Example 3 An ink receiving layer was obtained by coating a coating composition containing a porous pigment as a main component on the support. The coating composition is a commercially available synthetic amorphous silica (Fine Seal X37) as a porous pigment.
B: 100 parts of Tokuyama Co., Ltd .; commercially available polyvinyl alcohol as a binder (PVA117: Kuraray Co., Ltd.)
40 parts were prepared and obtained. The solid content concentration of the coating composition is 1
7%. The coating composition was applied on a support to an absolute dry weight of 10 g / m ² with an air knife coater and dried, and then on-machined so that the Beck smoothness of the ink receiving layer surface was 70 seconds. Soft calendering was performed to obtain an ink receiving layer.

Next, a gloss developing layer was applied on the ink receiving layer in the same manner as in Example 1 to obtain an ink jet recording sheet of Example 3.

Example 4 An ink receiving layer was obtained by applying a coating composition containing a porous pigment as a main component on the support. The coating composition is a commercially available synthetic amorphous silica (Fine Seal X37) as a porous pigment.
B: 100 parts of Tokuyama Co., Ltd .; commercially available polyvinyl alcohol as a binder (PVA117: Kuraray Co., Ltd.)
40 parts were prepared and obtained. The solid content concentration of the coating composition is 1
7%. The coating composition was applied on a support to an absolute dry weight of 10 g / m ² with an air knife coater and dried, and then the off-machine was applied so that the Beck smoothness of the ink receiving layer surface was 130 seconds. Super calendar treatment was performed to obtain an ink receiving layer.

Then, a gloss developing layer was applied on the ink receiving layer in the same manner as in Example 1 to obtain an ink jet recording sheet of Example 4.

Comparative Example 1 An ink receiving layer was obtained by applying a coating composition containing a porous pigment as a main component on the support. The coating composition is a commercially available synthetic amorphous silica (Fine Seal X37) as a porous pigment.
B: 50 parts of Tokuyama Corporation, 50 parts of commercially available synthetic amorphous silica (Mizukasil P78D: manufactured by Mizusawa Chemical Co., Ltd.), and commercially available polyvinyl alcohol (PVA11) as a binder
7: manufactured by Kuraray Co., Ltd.). The solids content of the coating composition is 17%. The coating composition was applied on a support with an air knife coater so as to have an absolute dry weight of 10 g / m ² and dried to obtain an ink receiving layer. No calendaring was performed. The Beck smoothness of the ink receiving layer surface was 23 seconds.

Then, a glossy layer was applied on the ink receiving layer in the same manner as in Example 1 to obtain an ink jet recording sheet of Comparative Example 1.

Comparative Example 2 An ink receiving layer was obtained by applying a coating composition containing a porous pigment as a main component on the support. The coating composition is a commercially available synthetic amorphous silica (Fine Seal X37) as a porous pigment.
B: 100 parts of Tokuyama Co., Ltd .; commercially available polyvinyl alcohol as a binder (PVA117: Kuraray Co., Ltd.)
40 parts were prepared and obtained. The solid content concentration of the coating composition is 1
7%. The coating composition was applied on a support to an absolute dry weight of 10 g / m ² using an air knife coater and dried, and then the off-machine was applied so that the Bekk smoothness of the ink receiving layer surface was 160 seconds. Super calendar treatment was performed to obtain an ink receiving layer.

Next, an attempt was made to apply a gloss-developing layer in the same manner as in Example 1. However, a large number of blisters occurred when the roll was pressed against a mirror-surface roll and dried. Moreover, the operation was substantially difficult.

Comparative Example 3 An ink receiving layer was obtained by coating a coating composition containing a porous pigment as a main component on the support. The coating composition is a commercially available synthetic amorphous silica (Fine Seal X37) as a porous pigment.
B: 100 parts of Tokuyama Co., Ltd .; commercially available polyvinyl alcohol as a binder (PVA117: Kuraray Co., Ltd.)
40 parts were prepared and obtained. The solid content concentration of the coating composition is 1
7%. The coating composition was applied on a support with an air knife coater so as to have an absolute dry weight of 10 g / m ² and dried to obtain an ink receiving layer. The Bekk smoothness of the ink receiving layer surface was 28 seconds. No calendaring was performed.

Next, the coating composition was applied on the ink receiving layer applied on the support to obtain a glossy layer. The coating composition contained 50 parts of commercially available colloidal silica (Snowtex AK: manufactured by Nissan Chemical Industries, Ltd.) as a pigment and 50 parts of commercially available alumina sol (Cataloid AS-3: manufactured by Catalyst Kasei Co., Ltd.).
Parts, commercially available polyvinyl alcohol (P
VA117: manufactured by Kuraray Co., Ltd.). The solid content concentration of the coating composition is 12%. The coating composition is applied on the ink receiving layer with an air knife coater so that the absolute dry coating amount is 5 g / m ^2, and dried, and then the glossiness of the gloss expressing layer is 65%. Super calendering was performed using an off-machine to obtain an inkjet recording sheet of Comparative Example 3.

Table 1 shows the evaluation results for the examples and comparative examples.
Shown in The evaluation shown in Table 1 was performed by the following method.

<Glossiness> The 75 ° specular glossiness of the surface of the glossy layer was measured. The gloss is measured according to JIS Z8741 using a gloss meter (digital gloss meter GM-26D:
It was measured with a digital gloss meter manufactured by Murakami Color Research Laboratory.

<Color Development> Using a commercially available ink jet printer (BJC420J; equipped with a photo ink cartridge: manufactured by Canon Inc.), solid printing of black ink was performed, and the optical reflection density of the printing portion was measured using a Macbeth densitometer (RD91).
Measured in 9).

<Absorptivity> Using the above-described ink jet printer, a grid pattern of white lines (non-printed portion) was created in a mixed color solid pattern composed of cyan ink and magenta ink, and the seepage of the ink into the grid was determined as follows. It was visually determined by reference. Evaluation C is a level that poses a problem in practical use. A: The lattice is clear. B: The grid becomes narrow, and the ink seeps out slightly. C: The grid is partially missing due to ink seeping.

[0051]

[Table 1]

From Examples 1 to 4 and Comparative Examples 1 to 3, the Beck smoothness of the ink receiving layer was set to 30 seconds or more and 150 seconds or less,
By coating the glossy layer by casting,
It can be seen that the absorptivity is good and high gloss is obtained. In Comparative Example 2, the ink jet recording sheet was not evaluated because a blister occurred when the gloss developing layer was applied and pressed against a heated specular roll and dried. At this time, the operation was substantially difficult.

[0053]

As is clear from the examples, the present invention
An ink-jet recording sheet comprising at least one ink-receiving layer and a glossy layer coated by pressing and heating a mirror roll heated in a wet state, followed by drying. By adjusting the Beck smoothness of the ink receiving layer at the time of setting to a specific range, it is possible to provide a high gloss ink jet recording sheet having good absorbability.

Claims (1)

[Claims] At least one ink-receiving layer and a glossy layer coated by pressing and drying a mirror roll heated in a wet state are dried on one surface of a support. In the ink jet recording sheet, the Beck smoothness of the ink receiving layer at the time of coating the glossy layer is 30 seconds or more and 1
An ink jet recording sheet having a duration of 50 seconds or less.