JPH1178216A - Ink jet recording sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a round printed dot shape, a clear image, a high printed density by a method wherein wax emulsion which is emulsified with a cationic emulsifier and solid at ordinary temperature, and high-molecular compound to which ethylene oxide expressed by the formula I or formula II is added, are contained in a white pigment layer. SOLUTION: Wax emulsion which is emulsified with a cationic emulsifier and solid at ordinary temperature, and a high-molecular compound expressed by the formula I or the formula II (in the formula, n and m indicate an added mol.%) are contained in a white pigment layer. As the cationic emulsifier, dimethylaminoethyl acrylate, dimethylaminoethyl methacrylate, methylethylaminoethyl acrylate, dimethylaminoethyl methacrylate, methylethylaminoethyl acrylate, etc., are mentioned. As the wax which is solid at ordinary temperature, petroleum series wax such as paraffin wax, microcrystalline wax, petrolatum, polyethylene wax, etc., or petrochemical series synthetic wax or the like is mentioned.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording sheet used for an ink jet recording system using an aqueous ink.
More specifically, the present invention relates to an ink jet recording sheet excellent in clarity and preservability of a printed image.

[0002]

2. Description of the Related Art An ink jet recording system does not require processes such as development and fixing as in the case of a photograph, and has a low printing cost, low printing noise, high-speed printing, and easy full-color printing. That a colored image is formed and that the recording device can be made relatively small,
In recent years, it has been used as a recording medium for facsimile machines and various printers due to advantages such as easy maintenance of the apparatus. The recording sheet of the ink jet recording method using the water-based ink is a high-quality paper that is often used for monochrome printing. A recording sheet having a high full-color image density, sharpness, and excellent resolution, that is, coated paper provided with a recording layer by applying a white pigment such as silica to a support such as paper. Furthermore, in order to obtain a high-quality image such as a color photograph, the recorded image is projected on a screen by a recording sheet having a mirror surface layer provided on a support such as paper, or an optical device such as a slide or an overhead projector (OHP). There are recording sheets and the like using a support made of a film of high transparency such as polyethylene or polypropylene, and many proposals have been made.

More specifically, for example, Japanese Patent Application Laid-Open Nos. 55-5830 and 55-515 propose a method of using coated paper as a recording sheet.
No. 83, No. 55-144172, No. 56-14858
No. 2, No. 56-148585, No. 57-64591
Nos. 57-19084 and 57-187289
No., 57-191083, 58-16884,
Nos. 58-24493, 58-72495, 58
-134784, 59-35977 and 59-3
No. 8087, No. 59-96988, No. 60-8708
No. 9, No. 60-171190, No. 60-174684
No. 61-66686, No. 61-74880, No. 61-125878, No. 61-134290, No. 6
1-148090, 61-230979, 62
-32078, 62-83178, 62-23
No. 8783, No. 62-288076, No. 63-115
No. 780, No. 63-162275, No. 64-9776
Nos. 64-24785, 64-75281, JP-A-1-95092, 1-108083, and 2-
No. 11384, No. 4-267180, No. 4-3208
No. 77, No. 5-42757, No. 5-85034, No. 5-96844, No. 5-139023, No. 6-72
No. 017, No. 6-143800, No. 6-158596
Nos. 7-25131, 7-32725, 9-
No. 66663, No. 9-86032, No. 9-99629
And the like.

A specific example of a recording sheet provided with a mirror surface layer is disclosed in JP-A-5-59694 and JP-A-6-155892.
Nos. 6-248599, 6-305237, 6-320857, 7-89220, 7-10
No. 1142, No. 7-149038, No. 7-19582
No. 4, No. 8-230311, No. 9-86033, No. 9-99628, No. 9-104160, No. 9-11
Nos. 9093, 9-123592 and 9-15621
No. 0 publication.

Most of these proposals are concerned with improving the quality of the recording sheet.
Ink drying property: The recording layer has excellent ink absorption, and ink drying is fast. 2. Print density and image clarity: The print dot diameter is appropriately widened, the print density is high, the dot shape is almost perfect, and a clear image without bleeding is obtained. 3. Glossiness: High glossiness of printed image. 4. Transparency: The transparency of the image printed on the film is high, and it is clearly displayed on the screen. 5. Curling resistance: The recording sheet does not curl due to the influence of temperature and humidity. 6. Water resistance: There is no bleeding or running out of ink even if water adheres to the printing portion of the recording sheet. 7. Light resistance: No discoloration occurs even when the printed portion of the recording sheet is irradiated with sunlight or a fluorescent lamp for a long time. 8. Yellowing resistance
-The blank portion of the recording sheet does not turn yellow in an atmosphere such as NOx and ozone. 9. Blocking resistance: The recording sheet does not cause blocking during storage. 10. Fingerprint resistance
・ Especially in the case of a recording sheet having a mirror surface, even if touched by a hand, there is not much trace of a fingerprint. 11. Adhesiveness: When the recording sheet is bent, the recording layer does not peel off.

Specific methods for improving the quality include, for example, beating degree, pH, type of filler and size pressing agent, sizing degree of pulp constituting a support such as paper, and the like.
Design of air permeability etc. White pigment, colloidal substance, water-soluble polymer, synthetic polymer latex, dot conditioner, cationic substance as ink fixing agent, fluorescent whitening agent that constitutes a coating layer provided on a support such as paper or a mirror surface layer It is recommended for such types and has been put to practical use. However, there are many problems with insufficient quality, and further improvement is demanded.

As means for further improving the printing density and the ink absorbency, JP-A-3-43291 discloses a coating layer containing synthetic fine particle silica, a water-soluble polymer binder and a cationic oligomer or polymer. Acetylene glycol having one triple bond in the molecule,
There is a statement that ethylene oxide adduct of acetylene glycol contains one or more acetylene alcohols, and although the inventors of the present invention have confirmed that they are effective,
It turns out that it is only one step now.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a printing sheet having a clear dot shape with substantially perfect circles and no bleeding in the characteristics of the printing image of a recording sheet used in an ink jet recording system using an aqueous ink. Is to provide an ink jet recording sheet having high print density, excellent storage stability such as light fastness, etc., and sufficiently adapting to diversification of uses.

[0009]

As a result of extensive studies and experiments, the present inventors have found that a wax emulsion which is solid at room temperature and is emulsified with a cationic emulsifier in a white pigment layer provided on a support such as paper. The present invention has been made based on the finding that the object can be achieved by including the polymer compound to which ethylene oxide is added, which is represented by (1) or (2).

[0010]

Embedded image

[0011]

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[0012]

DETAILED DESCRIPTION OF THE INVENTION The first invention of the present invention relates to (1) or (2) a wax emulsion which is emulsified with a cationic emulsifier in a white pigment layer provided on the surface of a support such as paper and is solid at room temperature. An ink jet recording sheet containing the polymer compound represented by the formula (1) is obtained. As the cationic emulsifier used in the present invention, for example, specifically, dimethylaminoethyl acrylate, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, methylethylaminoethyl acrylate, dimethylaminostyrene, diethylaminostyrene, methylethylaminostyrene, etc. No.

Examples of the wax which is solid at room temperature for use in the present invention include, for example, paraffin wax, microcrystalline wax, petrolatum, Fischer
Petroleum waxes such as Tropsch wax and polyethylene wax or petrochemical synthetic waxes; plant waxes such as carnauba wax, candelilla wax, rice wax, and wood wax; animal waxes such as beeswax, lanolin, and whale wax; montan wax , Ozokerite, ceresin and the like; and higher fatty acids such as stearic acid, stearic acid methyl ester, stearic acid amide, ethylenebisstearamide, calcium stearate, zinc stearate and derivatives thereof.

The white pigment layer used as the ink jet recording layer of the present invention comprises a mixture of a white pigment, a binder, an ink fixing agent and the like. Examples of the white pigment include clay, talc, kaolin, calcined kaolin, calcium carbonate, Magnesium carbonate, titanium oxide, zinc oxide, silicon oxide, aluminum oxide, calcium silicate, aluminum silicate, magnesium silicate, aluminum hydroxide, magnesium hydroxide, barium sulfate, zinc stearate, calcium stearate, polyethylene, polystyrene, poly Plastic pigments such as acrylate are exemplified, and one kind or a mixture of two or more kinds is used.

The mixing ratio of the polymer compound represented by (1) or (2) to the white pigment layer used in the present invention is 0.01 to 5 as a dry weight solid based on 100 parts by weight of the white pigment.
Parts by weight, preferably 0.05 to 2 parts by weight.
If the amount is less than 0.01 part by weight, the print density is lowered, and if it exceeds 3 parts by weight, the printed image lacks in sharpness. Examples of the binder include starch, casein, soy protein, gelatin, carboxymethylcellulose, natural or semi-synthetic polymers such as hydroxyethylcellulose, polyvinyl alcohol,
Silyl-modified polyvinyl alcohol and its derivatives, polyvinylpyrrolidone-based resin, poly (meth) acrylic acid or its copolymer, maleic anhydride or its copolymer, acrylamide-based resin, (meth) acrylate-based resin, polyamide-based resin , Synthetic water-soluble resins such as polyurethane resins, alkyd resins, epoxy resins, epichlorohydrin resins, urea resins, and melamine resins; conjugated diene polymers such as styrene-butadiene copolymers and methyl methacrylate-butadiene copolymers latex,
An acrylic polymer latex such as a polymer or a copolymer of an acrylic ester or a methacrylic ester, and a vinyl polymer latex such as an ethylene-vinyl acetate copolymer are exemplified.

Examples of the cationic substance as an ink fixing agent include urea-formaldehyde resin and cyanamide-
Formaldehyde resin, dicyandiamide-formaldehyde resin, polyalkylenepolyamine-dicyandiamide condensate, formaldehyde-aromatic amine condensate,
N- (1,1-dimethyl-3-dimethylaminopropyl) (meth) acrylamide, N- (1,1-dimethyl-3-dimethylaminobutyl) (meth) acrylamide, N- (1-methyl-1,3 -Diphenyl-3-diethylaminopropyl) (meth) acrylamide, N-
(3-dimethylaminopropyl) (meth) acrylamide, N- (2-dimethylaminoethyl) (meth) acrylamide, N- (4-dimethylaminobutyl) (meth)
Acrylamide, N-vinylimidazole, 2-methyl-N-vinylimidazole, vinyl-3-dimethylaminopropyl ether, vinyl-2-dimethylaminoethyl ether, vinyl-4-dimethylaminobutyl ether, isopropenyl-3-dimethylaminopropyl Ether, isopropenyl-2-dimethylaminoethyl ether, allyl-3-dimethylaminopropyl ether,
Allyl-2-dimethylaminoethyl ether, allyl-
4-dimethylaminobutylether, allyldimethylamine, methallyldimethylamine, 3-butenedimethylamine and these with alkyl halides, especially methyl chloride, or quaternizing agents such as ethyl chloride or dimethyl sulfate, methyl p-toluenesulfonate. Quaternized monomers,
Alternatively, dimethyldiallylammonium chloride, diethyldiallylammonium chloride and the like can be mentioned.

Further, in the present invention, if desired, bis (triazinylamino) stilbene disulfonic acid derivative, coumarin derivative, pyrazoline derivative, naphthalimide derivative,
Bisbenzoxazolyl derivatives, fluorescent brighteners such as bisstyrylbiphenyl derivatives, cathod soda, sodium silicate,
Preservatives such as pH adjuster such as monoethanolamine, benzimidazolyl carbamic acid methyl ester, allylmethanol mono (poly) hemifomal, mixture of methylol derivative and isothiazolinone, and 2-phenylphenol sodium salt are appropriately added for white pigment layer. The coating solution is formed into a coating solution, and the coating amount is 3 to 30 g / m ² (dry weight) on a front surface of a support such as paper by a coating method such as a blade coater, an air knife coater, a curtain coater, a bar coater, a gravure coater, and a roll coater. (Solid content), preferably 7 to 20 g / m ^2, and dried to form a white pigment layer to obtain an ink jet recording sheet. The white pigment layer of the present invention is preferably treated with a smoothing device such as a super calender or a soft calender in order to improve the clarity and transportability of a printed image.

As a second invention, a white pigment layer containing the wax emulsion of the present invention and the polymer compound of (1) or (2) is coated on both sides of a support such as paper with the first and / or second pigment.
An ink jet recording sheet is obtained in the same manner as in the invention of (1).

As a third invention, a coating layer for a mirror surface layer containing the wax emulsion of the present invention and the polymer compound of (1) or (2) is provided, and a mirror finish is performed by calendering. Alternatively, an ink jet recording sheet having a mirror surface is obtained by, for example, pressing, drying, and releasing the wet coating layer on a heating drum surface having a mirror surface and copying the mirror surface. The mirror layer used as the inkjet mirror recording layer of the present invention contains a white pigment, a binder, and an ink fixing agent similar to the white pigment layer. As the white pigment for mirror surface used in the present invention, light calcium carbonate, heavy calcium carbonate, kaolin, talc, calcium sulfate, barium sulfate, titanium oxide, zinc oxide, zinc sulfide, zinc carbonate, satin white, aluminum silicate, Diatomaceous earth, calcium silicate, magnesium silicate, synthetic amorphous silica, colloidal silica, colloidal alumina, pseudoboehmite, aluminum hydroxide, alumina, lithopone, zeolite, hydrohaloysite, magnesium carbonate, magnesium hydroxide, magnesium hydroxide, polyethylene, polystyrene, Plastic pigments such as polyacrylate are mentioned, and one or more kinds thereof are used in combination. Particularly preferred white pigments are colloidal silica and colloidal alumina.

The mixing ratio of the wax emulsion used in the present invention and the polymer compound represented by the formula (1) or (2) to the mirror surface layer is 0.01 to 100 parts by weight of white pigment in terms of dry weight solids. -5 parts by weight. If the amount is less than 0.01 part by weight, the print density is reduced. If the amount is more than 5 parts by weight, the glossiness is reduced and the printed image lacks sharpness.

The binder for the white pigment for mirror surface used in the present invention includes starch derivatives such as oxidized starch, etherified starch and esterified starch, cellulose derivatives such as carboxymethylcellulose and hydroxyethylcellulose, casein, gelatin and soybean protein. , Polyvinyl alcohol or a derivative thereof, polyvinylpyrrolidone, maleic anhydride resin, styrene-butadiene copolymer, conjugated diene-based copolymer latex such as methyl methacrylate-butadiene copolymer, acrylic acid ester and methacrylic acid ester polymer or Acrylic polymer latex such as copolymer, vinyl polymer latex such as ethylene vinyl acetate copolymer, or functional group modified polymer latex such as carboxyl group of these various polymers, heat of melamine resin, urea resin, etc. Cured synthetic resin Aqueous binders, such as acrylates such as polymethyl methacrylate, polymer or copolymer resins of methacrylates, polyurethane resins, unsaturated polyester resins, vinyl chloride-vinyl acetate copolymers, polyvinyl butyl resins, alkyd resins, etc. Synthetic resin binders are used, and particularly preferred binders are styrene-butadiene copolymer, methyl methacrylate-
Conjugated diene copolymer latex such as butadiene copolymer, acrylic polymer latex such as acrylate or methacrylate polymer or copolymer, or functional group-modified polymer such as carboxyl group of these various polymers Combined latex.

Further, in the present invention, if necessary, a fluorescent brightening agent and a preservative similar to the white pigment layer are appropriately added to form a coating solution for mirror surface, and a blade coater, an air knife coater, a curtain coater, a bar coater, With a coating method such as a gravure coater or a roll coater, the front surface coated amount of a support such as paper is 5 to 30 g / m ² (dry weight solid content),
After applying and drying preferably to 10 to 20 g / m ² , the coated surface is subjected to a pressure treatment with a heated chilled roll surface of a super calender to obtain an ink jet recording sheet having a mirror surface.

According to a fourth aspect of the present invention, an intermediate layer containing a white pigment as a main component is provided between a support such as paper, the wax emulsion and a mirror surface layer containing the polymer compound represented by (1) or (2). To obtain an ink jet recording sheet having a mirror surface. The white pigment and the binder for the intermediate layer used in the present invention,
The white pigment and the binder are the same as those of the first invention, and the intermediate layer optionally contains an ink fixing agent or the wax emulsion and the polymer compound represented by (1) or (2). The coating amount is 3 to 25 g by the same coating method as the invention.
/ M ² (dry weight solids) to provide an intermediate layer, and then apply, dry, and super calender pressure treatment on the upper layer in the same manner as in the fourth invention to obtain a mirror surface. Is obtained.

The object of the present invention can be achieved by coating the ink jet recording sheet of the present invention on a support such as a paper or film coated with a polyolefin resin on both sides of the paper in addition to the paper. It can also be applied to an ink jet recording sheet provided with a pressure-sensitive adhesive layer or a pressure-sensitive adhesive layer for labels on the back surface.

[0025]

The preferred embodiment of the present invention and its excellent effects will be specifically described below with reference to the most typical examples. The following parts are all parts by weight, and all percentages are percentages by weight.

Example 1 [Preparation of paper support] LBKP (fiber length 0.7 mm, freeness 350 ml) 80 parts NBKP (fiber length 0.7 mm, freeness 350 ml) 20 parts Talc 5 parts Rosin emulsion size 0.5 part ( Dick Hercules: New Ho 100) Sulfuric acid band 3 parts Amphoteric starch (Oji National: Cato 3210) 0.5 part 1% slurry of the above composition is made by TAPPI standard machine, and the obtained wet paper is pressed at 5 kg / cm ² . And then dried at 90 ° C. for 2 minutes. 6 on this paper support
Size press with an aqueous solution of 100% oxidized starch (manufactured by Nippon Shokuhin Kako Co., Ltd .: MS3800) to obtain a basis weight of 80 g for an ink jet recording sheet having an adhesion amount on both sides of 1.2 g / m ² (dry weight solid content)
A paper support of g / m ² was obtained.

[Preparation of 25% Paraffin Wax Emulsion] Paraffin wax (melting point: 63 ° C.) 25 parts Dimethylaminoethyl acrylate 10 parts Isopropyl alcohol 2 parts Butyl cellosolve 3 parts Water 60 parts The above mixture was put in a container and heated at a temperature of 80. ~ 90 ° C
The mixture was emulsified by high-speed stirring with a homogenizer in the range described above so that the average particle diameter became 0.1 to 0.3 μm, and then cooled to room temperature to obtain a 25% paraffin wax emulsion using a cationic emulsifier.

[Preparation of single-sided ink jet recording sheet] Water 59 mixed with 1.25 parts of 40% aqueous solution of sodium polyacrylate (T-40, manufactured by Toa Gosei Chemical Industry Co., Ltd.)
100 parts of synthetic amorphous silica (Fine Seal X-37B manufactured by Tokuyama Soda) is gradually added to and dispersed in 0 parts while stirring, and then 10% polyvinyl alcohol (Kuraray: PVA-) is added.
117) 400 parts of an aqueous solution, 20 parts of a 50% aqueous solution of N- (3-dimethylaminopropyl) (meth) acrylamide,
40 parts of 50% dimethyldiallylammonium chloride aqueous solution, 55% ethylene-vinyl acetate copolymer latex (Sumitomo Chemical: Sumikaflex S-400) 36
Parts, 25% paraffin wax emulsion 40 parts,
5 parts of a 10% aqueous solution of the polymer compound represented by (1) was sequentially added to form a coating solution for a white pigment layer, and the above-mentioned paper support having a basis weight of 80 g / m ² was obtained using an air knife coater. The surface was coated and dried so as to have a coating amount of 10 g / m ² (dry weight solid content) to form a white pigment layer, and then subjected to a super calender treatment to obtain a single-sided ink jet recording sheet.

Example 2 [Preparation of single-sided ink jet recording sheet] 5 parts of a 10% aqueous solution of the polymer compound shown in (1) of Example 1 was added to the polymer compound (ethylene oxide 3) shown in (2).
A single-sided ink jet recording sheet was obtained in the same manner except that the same amount was replaced with a 10% aqueous solution to give a coating solution for a white pigment layer.

Example 3 [Preparation of single-sided ink jet recording sheet] 5 parts of a 10% aqueous solution of the polymer compound shown in (1) of Example 1 was replaced with a polymer compound (ethylene oxide 3) shown in (2).
A single-sided ink jet recording sheet was obtained in the same manner except that the coating solution for the white pigment layer was replaced with 5 parts of the solution (0 mol addition).

Example 4 [Preparation of an ink jet recording sheet coated on both sides] The coating liquid for a white pigment layer of Example 2 was prepared in Example 1 to have a basis weight of 80.
g / m ² The front side and then the back side of the paper support were successively coated and dried with an air knife coater at an application amount of 10 g / m ² (dry weight solids) to form a white pigment layer. Super calendering was performed to obtain a double-sided ink jet recording sheet.

Example 5 [Preparation of ink jet recording sheet having mirror surface] 20
% Colloidal silica (Nissan Chemical: Snowtex-2
0) 500 parts, 50% styrene-butadiene copolymer latex (Nippon Synthetic Rubber: 0693) 20 parts, 50%
Dimethyl diallyl ammonium chloride aqueous solution 30
Parts, 25% paraffin wax emulsion 4 parts,
10 parts of a 10% aqueous solution of the polymer compound shown in (1) was sequentially added to form a coating solution for mirror surface, and the front side of the paper support having a basis weight of 80 g / m ² prepared in Example 1 with an air knife coater. After coating and drying so that the coating amount is 20 g / m ² (dry weight solid content), the coated surface is heated to a surface temperature of 50 ° C.
Super calendar chilled surface (Line pressure 100Kg / c
m) Processing was performed to obtain an ink jet recording sheet having a mirror surface.

Example 6 [Preparation of an ink jet recording sheet having a mirror surface] A 10% aqueous solution of the polymer compound 10% shown in (1) of Example 5 was used.
An ink jet recording sheet having a mirror surface was obtained in the same manner except that 8 parts of an aqueous solution of 10 parts of the polymer compound (addition of 10 moles of ethylene oxide) represented by (2) was used as a mirror surface coating solution.

Example 7 [Preparation of an ink jet recording sheet having a mirror surface provided with an intermediate layer] 40% sodium polyacrylate (T-4
0) 100 parts of synthetic amorphous silica (Fine Seal X37B) was gradually added to and dispersed in 300 parts of water mixed with 1.25 parts of an aqueous solution, and then 200 parts of a 10% aqueous solution of polyvinyl alcohol (PVA-117) was added. form a white pigment layer coating solution was added sequentially, the amount of coating on the front side of the basis weight of 80 g / m ² paper support were papermaking in example 1 by an air knife coater 15 g / m ² (dry weight solids ) And dried to form an intermediate layer. Then, the mirror surface coating solution of Example 6 was applied on the intermediate layer by an air knife coater so that the coating amount was 8 g / m ² (dry weight solid content).
After drying, the coated surface was treated with a super calender chilled surface (linear pressure: 100 kg / cm) at a surface temperature of 50 ° C. to obtain an ink jet recording sheet having a mirror surface.

Comparative Example 1 [Preparation of single-sided ink-jet recording sheet] A single-sided ink-jet recording sheet was prepared in the same manner as in Example 1 except that a coating solution for a white pigment layer was used except for 40 parts of a 25% paraffin wax emulsion. I got

Comparative Example 2 [Preparation of Inkjet Recording Sheet Having Mirror Surface] An ink jet recording sheet having a mirror surface was obtained in the same manner as in Example 5 except that a coating solution for mirror surface was used except for 4 parts of a 25% paraffin wax emulsion. Was.

Comparative Example 3 [Preparation of single-sided ink jet recording sheet] Coating for white pigment layer except for 40 parts of 25% paraffin wax emulsion of Example 1 and 5 parts of 10% aqueous solution of polymer compound shown in (1). A single-sided ink jet recording sheet was obtained in the same manner except that the liquid was used.

Comparative Example 4 [Preparation of Inkjet Recording Sheet Having Mirror Surface] A mirror surface coating solution was prepared except for 4 parts of the 25% paraffin wax emulsion of Example 5 and 10 parts of a 10% aqueous solution of the polymer compound shown in (1). An ink jet recording sheet having a mirror surface was obtained in the same manner except that the above procedure was repeated.

Comparative Example 5 [Preparation of single-sided ink-jet recording sheet] A single-sided ink-jet recording sheet was prepared in the same manner as in Example 2 except that a coating solution for a white pigment layer was used except for 40 parts of a 25% paraffin wax emulsion. I got

Comparative Example 6 [Preparation of single-sided ink jet recording sheet] 40 parts of the 25% paraffin wax emulsion of Example 2 and a polymer compound represented by (2) (ethylene oxide 3
A single-sided ink jet recording sheet was obtained in the same manner except that a coating solution for a white pigment layer was used except for 5 parts of a 10% aqueous solution except for 5 parts of a 10% aqueous solution.

Evaluation Method <Print Density of Inkjet Recording Sheet> The optical density of black, cyan, magenta, and solid monochrome image portions printed by an inkjet printer BJC420J was measured with a Macbeth densitometer RD918. The larger the numerical value, the higher the concentration and the better. <Clearness of Printed Image on Inkjet Recording Sheet> The vividness of a black, cyan, magenta, and yellow solid image portion printed by an inkjet printer BJC420J was visually determined. The mark “○” is excellent in the overall evaluation.
△ mark is standard. X mark is inferior.

<Glossiness of Specular Inkjet Recording Sheet> Based on JIS Z8741, a 75 ° specular glossiness of a blank portion is measured with a gloss meter (VGS1001D manufactured by Nippon Denshoku Industries Co., Ltd.).
P). Larger numbers are better. <Lightfastness of inkjet recording sheet> After irradiating a magenta solid image portion printed by an inkjet printer MJ700V2C with a 5000 Lx fluorescent lamp for 120 hours, the optical density of the solid image portion was measured with a Macbeth densitometer RD918, and the lightfastness was calculated by the following equation. (%) Was determined. Lightfastness (%) = Optical density after irradiation / Optical density before irradiation

Table 1 summarizes the above evaluation results.

[0044]

[Table 1]

[0045]

As is apparent from the present invention, by providing a white pigment layer containing the wax emulsion and the polymer compound or a mirror surface layer on a support such as paper, the characteristics of the printed image on the recording sheet can be improved. The printed dot shape was almost a perfect circle, no bleeding, a clear image was obtained, the print density was high, and an ink jet recording sheet excellent in storage stability such as light resistance could be provided.

Claims (4)

[Claims] 1. An ink jet recording sheet comprising a support such as paper provided with a white pigment layer, wherein the white pigment layer is emulsified with a cationic emulsifier and solid at room temperature with a wax emulsion (1) or (2). An ink-jet recording sheet comprising the polymer compound shown below. Embedded image Embedded image 2. The ink jet recording sheet according to claim 1, wherein a white pigment layer is provided on both sides of a support such as paper. 3. An ink jet recording sheet comprising a support such as paper provided with a mirror surface layer, wherein the polymer layer represented by (1) or (2) is contained in the mirror surface layer. . Embedded image Embedded image 4. The ink jet recording sheet according to claim 3, wherein an intermediate layer mainly composed of a white pigment is provided between the support such as paper and the mirror surface layer.