JPH10250221A - Inkjet recording sheet - Google Patents

Abstract

(57) Abstract: An ink jet recording sheet having excellent printing characteristics is provided. An ink receiving layer containing gelatin is provided on at least one surface of a support, and at least two or more ink receiving layers containing gelatin are provided. It contains a water-soluble vinyl polymer, and the lower layer further contains a water-soluble cellulose derivative in addition to gelatin. [Effect] It is excellent in image clarity, resolution and uniformity, and also excellent in ink absorption.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording sheet mainly using an aqueous ink, and more particularly to an image having excellent clarity, resolution and uniformity of an image, and further having an ink adsorbing property and a drying property immediately after printing. The present invention relates to an excellent ink jet recording sheet.

[0002]

2. Description of the Related Art Ink jet recording is free of noise and is capable of high-speed printing. Further, by using a plurality of ink nozzles, it is easy to perform multi-color recording, and multi-color ink jet recording is performed by various ink jet recording methods. In particular, use of an ink jet printer capable of forming a complex image quickly and accurately has attracted attention as a hard copy creation device for image information such as characters, various figures, and photographs created by a computer. Further, image information created by these computers is recorded on a transparent recording sheet by an ink jet printer, and this is also used as a document such as an OHP (overhead projector). In recent years, inkjet printers, which have attracted special attention, are used in applications where color image quality similar to photographs is required, such as color printing in the printing field, design image output in the design department, and large inkjet plotters. These are large format posters, displays, flags, etc. that can be easily created. Furthermore, in recent years, digital photographic images have become familiar, as represented by digital cameras, and attempts have been made to output these images with inexpensive inkjet printers. Inkjet printers equipped with exclusive modes and inks for photography have also been released. ing.

As inks for ink jet recording,
From the viewpoints of safety and recording characteristics, inks mainly containing water and a polyhydric alcohol as main components are used to prevent clogging of ink and to improve discharge characteristics.

As a recording sheet used in the ink jet recording system, a pigment such as amorphous silica and a water-soluble binder such as polyvinyl alcohol are coated on a support which is conventionally called ordinary paper or ink jet recording paper. A recording sheet provided with a porous ink absorbing layer has been used.

[0005] However, when these conventional recording sheets are used for a copy original or a design original which requires high resolution and gloss, there are some serious problems. In other words, when printing was performed using these recording sheets, the ink bleeding was large, the gloss was low, and it was not very usable. Also, when these conventional recording sheets are used for large-sized inkjet plotters, posters that require a high coloring density can cause the paper to be wavy due to a large amount of ink and become ugly in appearance. In addition, the color density is low.

Further, when a conventional ink absorbing layer is used for OHP, there is a problem that even if a transparent support is used, the porous ink absorbing layer deteriorates light transmittance. When the surface of the ink absorbing layer is non-porous, the light transmittance is improved. However, there was a problem that the length was longer.

In order to solve such problems, many recording sheets provided with a transparent ink absorbing layer having high ink receptivity have been proposed. For example, JP-A-60-168
No. 651, the use of polyvinyl alcohol and a polyacrylic acid-based water-soluble polymer is used.
No. 181679 discloses the use of a mixture of carboxymethyl cellulose and polyethylene oxide.
No. 93879 discloses the use of a mixture of water-soluble cellulose and polyvinylpyrrolidone, and JP-A-62-263084 discloses a receiving layer formed from an aqueous gelatin solution having a specific pH.
JP-A-1-146784 proposes the use of a mixture of gelatin and a surfactant, respectively.

Further, there have been proposed a large number of recording sheets provided with two or more ink receiving layers to achieve higher ink absorbency. For example, JP-A-60-224578
The use of a laminate of a water-soluble polymer substance is disclosed in
JP-A-12388 and JP-A-61-35275 disclose a recording medium having an ink holding layer and an ink-permeable layer.
In JP-A-253483, a recording medium having an ink transporting layer and an ink holding layer is used. In JP-A-63-111579, a recording sheet made of polyvinylpyrrolidone and polyvinylbutyral is used. The recording sheet that has
JP-A-7-186521 proposes a recording sheet comprising a layer made of a water-soluble resin, a layer made of a hydrophilic resin, inorganic fine particles and a filler.

The recording sheets described in these patents are:
Although the ink receptivity has been improved to some extent, it is still insufficient, and in particular, dot reproducibility, ink absorbency, and ink dryness are insufficient.

[0010]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an ink jet recording system which has very high ink receptivity and dot reproducibility, resulting in excellent resolution and color reproducibility. An object of the present invention is to provide an inkjet recording sheet that provides high-quality inkjet recording.

The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, have found that in an ink jet recording sheet having an ink receiving layer provided on at least one surface of a support, the ink receiving layer containing gelatin is contained. At least two layers, the upper layer further contains at least one or more water-soluble vinyl polymers in gelatin, and the lower layer further contains at least one or more water-soluble cellulose derivatives in gelatin. This is achieved by an ink jet recording sheet characterized by the following.

[0012]

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

As the gelatin used in the present invention, any gelatin can be used as long as it is made of animal collagen, but gelatin made of collagen made of pig skin, cow skin, and cow bone is preferred. There is no particular limitation on the kind of gelatin, but lime-treated gelatin, acid-treated gelatin, and gelatin derivatives (for example, Japanese Patent Publication No. Sho 38-4)
No. 854, No. 39-5514, No. 40-1223
7, No. 42-26345, U.S. Pat.
No. 53, No. 2594293, No. 2614928
No. 2763639, No. 3118766, No. 3132945, No. 3186846, No. 33
12553, British Patent Nos. 8661414 and 103
3189) can be used alone or in combination thereof.

The gelatin used in the present invention has a jelly strength (based on a PAGI method and a bloom-type jelly strength meter) of preferably 150 g or more, particularly preferably 200 g or more.

In the present invention, it is necessary to further use the following hydrophilic vinyl polymer in combination with gelatin for the purpose of improving ink receptivity and dot reproducibility in the upper ink receiving layer. Examples of the synthetic polymer used in combination include vinyl formal such as polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl pyridinium halide, and various modified polyvinyl alcohols and derivatives thereof (JP-A-60-145879, JP-A-60-220750,
No.61-143177, No.61-235182
No. 61-235183 and No. 61-23768
No. 1, No. 61-26089), polyacrylamide, polydimethylacrylamide, polydimethylaminoacrylate, sodium polyacrylate, methacrylic acid copolymer salt, polysodium methacrylate, vinyl acrylate copolymer Polymers containing an acryl group such as a salt (Japanese Patent Application Laid-Open Nos.
No. 9988), polyethylene glycol, polypropylene glycol, polyvinyl ether (Japanese Unexamined Patent Publication No. Sho 61)
No. 32787, No. 61-237680, No. 61
-277483) and the like. Among these hydrophilic vinyl polymers, at least one selected from polyvinylpyrrolidone, polyvinylpyrrolidone derivative, polyvinyl alcohol, polyvinyl alcohol derivative, polyacrylamide, polyacrylamide derivative, and polyacrylic acid from the viewpoint of ink receptivity and dot reproducibility.
It is preferable to use various kinds of synthetic polymers in combination.

In the present invention, it is necessary to use the following water-soluble cellulose derivative in combination with gelatin for the purpose of improving ink receptivity, dot reproducibility and preventing stickiness of a printed portion in the lower ink receiving layer. It is. Examples of the water-soluble cellulose derivative used in combination include water-soluble cellulose derivatives such as methyl cellulose, carboxymethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, and hydroxypropyl cellulose. Among these water-soluble cellulose derivatives, carboxymethyl cellulose, hydroxyethyl cellulose, and at least one water-soluble cellulose derivative selected from methyl cellulose can be used in combination from the viewpoint of ink receptivity, dot reproducibility, and prevention of stickiness of a printed portion. preferable.

In the present invention, the ratio (weight ratio) of the water-soluble vinyl polymer to the gelatin used in the upper layer of the ink receiving layer varies depending on the type of the synthetic polymer used, but the ink receiving property and the dot reproducibility are improved. To achieve this, the synthetic polymer / gelatin ratio (weight ratio) is 5 / 95-
80/20 is preferred, and 10/90 to 70/3
More preferably, it is set to 0.

In the present invention, the ratio (weight ratio) of the water-soluble cellulose derivative used in combination with the gelatin in the lower layer of the ink-receiving layer varies depending on the kind of the water-soluble cellulose derivative used in combination. In order to improve the water-soluble cellulose derivative / gelatin ratio (weight ratio), the ratio is preferably 5/95 to 80/20, more preferably 10/90 to 70/30.

In the present invention, the weight ratio of the upper layer to the lower layer of the ink receiving layer is preferably 2/8 to 8/2, and the weight ratio of the upper layer to the lower layer of the ink receiving layer is smaller than 2/8. In such a case, the unevenness in the solid printing portion worsens, which is not preferable. Further, the weight ratio between the upper layer and the lower layer of the ink receiving layer is 8
If the ratio is larger than / 2, the ink absorbency deteriorates and the surface of the printed portion becomes sticky, which is not preferable.

[0020] In the present invention, the coating amount of the ink receiving layer is preferably from 1 to 10 g / m ² as the upper layer of the coating amount, preferably 1 to 10 g / m ² as the lower layer of the coating amount. If the coating amount of the upper layer is less than 1 g / m ² , the ink overflows, resulting in an unsightly image. Further, even if the amount of application of the lower layer is increased in order to reduce the overflow of the ink, the absorption of the ink becomes uneven and the image becomes similarly unsightly. When the coating amount of the upper layer exceeds 10 g / m ² , there is no problem in ink absorbency, but the curl characteristics of the sheet are significantly deteriorated at low or high humidity. Further, the cracking property may be deteriorated, and cracks may be generated during transportation by the printer. When the coating amount of the lower layer is less than 1 g / m ² , the absorbability of the high boiling point solvent contained in the ink is deteriorated, and the surface of the printed portion becomes extremely sticky. This stickiness is not reduced even if the coating amount of the upper layer is increased. If the coating amount of the lower layer exceeds 10 g / m ² , although there is no problem of stickiness of the printed portion, the curl characteristics of the sheet are significantly deteriorated at low humidity or high humidity. Further, the cracking property may be deteriorated, and cracks may be generated during transportation by the printer.

In the present invention, the coating amount of gelatin contained in the ink receiving layer is preferably from 1 to 10 g / m ² as a solid content in both the upper and lower layers. If the amount of gelatin contained in the ink receiving layer is less than 1 g / m ² , ink receptivity is poor and printability is deteriorated. Further, when the amount exceeds 10 g / m ² , the ink receptivity is improved, but problems such as cracking and curling occur.

In the present invention, a surfactant may be added to the ink receiving layer in order to improve dot reproducibility in addition to the binder. The surfactant used may be any of anionic, cationic, nonionic and betaine types, and may be of low molecular weight or high molecular weight. One or two or more surfactants are added to the ink receiving layer coating liquid. When two or more surfactants are used in combination, an anionic surfactant and a cationic surfactant are used in combination. It is not preferable. The amount of the surfactant to be added is preferably 0.001 g to 5 g, more preferably 0.01 g to 3 g, per 100 g of the binder constituting the ink receiving layer.

In the present invention, the ink receiving layer can be hardened with an appropriate hardener for the purpose of improving water resistance and dot reproducibility. Specific examples of the hardener include aldehyde compounds such as formaldehyde and glutaraldehyde, ketone compounds such as diacetyl and chloropentanedione, and bis (2-chloroethylurea) -2-hydroxy-4,6-dichloro-1. 3,3,5 triazine, a compound having a reactive halogen as described in U.S. Pat. No. 3,288,775, divinyl sulfone, U.S. Pat.
Compounds having a reactive olefin as described in 5718, N-methylol compounds as described in U.S. Pat. No. 2,732,316, isocyanates as described in U.S. Pat. No. 3,103,437, U.S. Pat.
Aziridine compounds as described in US Pat. No. 9,983,611, carbodiimide compounds as described in US Pat. No. 3,100,704, epoxy compounds as described in US Pat. There are inorganic hardeners such as alum, potassium alum and zirconium sulfate, and these can be used alone or in combination of two or more. The addition amount of the hardener is 0.0 to 100 g of the binder constituting the ink receiving layer.
1 g to 10 g is preferable, and 0.1 g to 5 g is more preferable.
g.

In the present invention, in addition to the above surfactants and hardeners, an inorganic pigment, a coloring dye,
Fixing agents for color pigments, ink dyes, UV absorbers, antioxidants, pigment dispersants, defoamers, leveling agents, preservatives,
Known various additives such as a fluorescent whitening agent, a viscosity stabilizer, and a pH adjuster can also be added.

It is preferable that the ink receiving layer in the present invention is dried by a so-called cold drying method in which the ink receiving layer is once brought into a gel state and then dried at a low temperature. This is a method of drying at a low temperature in order to form a uniform film surface utilizing the sol and gelation phenomena of gelatin. The drying process is described in "Coating Engineering" by Yuji Harasaki (1976, Asakura Shoten), 2
Material preheating period as described on pages 78-281,
The evaporation amount of the solvent per unit time, that is, the constant-rate drying period of the drying process in which the evaporation rate of the solvent is constant, thereafter, the evaporation rate of the solvent gradually decreases, and almost no vapor is generated (that is, the coating film is almost completely evaporated). 3) of reduced drying period of the drying process up to the equilibrium moisture content under hot and humid conditions of the outside air.
The process is divided into two processes, and if necessary, a humidity control period may be provided. Usually, drying is completed when the equilibrium water content of about 5 to 8% is reached. However, if the temperature of the film surface during the drying process (this temperature is referred to as surface wet bulb temperature) is lowered, a uniform coating film is obtained. And a high quality ink receiving layer is obtained. After applying the ink receiving layer coating solution, the coating layer is cooled and set (gelled) when the surface wet bulb temperature is below the gelling temperature of the coating solution, and then the receiving layer is gradually cooled at a temperature below the gelling temperature of the coating solution. To dry. After the solvent evaporates and the solids concentration increases, the temperature may be raised to such an extent that set return does not occur, followed by drying.

The coating method of the ink receiving layer coating liquid in the present invention may be a commonly used coating method (eg, slide lip method, curtain method, extrusion method, air knife method, roll coating method, rod bar coating method, etc.). ) Is used, but a slide lip method and a curtain method are preferable in that a multilayer ink receiving layer can be provided at a time.

In the present invention, the ink receiving layer may have a two-layer structure of an upper layer and a lower layer, and further has a third layer between the upper layer and the lower layer in the present invention, or a third layer further below the upper layer and the lower layer. Such a three-layer structure may be used. Further, the third layer may have a layer configuration exceeding three layers which are further multi-layered. The third layer is not particularly limited as long as it is a material that does not impair the suitability for ink-jet printing, but water-soluble substances such as gelatin, a water-soluble vinyl polymer, and a water-soluble cellulose derivative described in the present invention are preferably used. Japanese Patent Application Laid-Open No. 57-89 describes an example of a multilayer structure.
No. 954, No. 60-224578, No. 61-1238
No. 8 are mentioned.

Although the ink receiving layer is provided on at least one side of the support, it may be provided on both sides of the support for the purpose of preventing curling.

As the support used in the present invention, a transparent support or an opaque support can be used. As the transparent support, any conventionally known ones can be used, for example, polyester resin, diacetate resin, triacetate resin, acrylic resin, polycarbonate resin, polyvinyl chloride, polyimide resin, cellophane, film or plate of celluloid and the like and A glass plate and the like can be mentioned.

Such a transparent support has a thickness of about 1
It is preferably about 0 to 200 μm.

As the opaque support, any conventionally known opaque supports such as paper, coated paper, synthetic paper, resin-coated paper, opaque film containing pigment, and foam film can be used. Gloss,
Synthetic paper, resin-coated paper, and various films are more preferable from the viewpoint of smoothness, but resin-coated paper similar to a photographic support is more preferable from the feeling of touch and luxury.

The base paper constituting the resin-coated paper preferably used in the present invention is not particularly limited, and generally used paper can be used. More preferably, for example, a base paper used for a photographic support is used. Smooth base paper is preferred. As the pulp constituting the base paper, natural pulp, recycled pulp, synthetic pulp or the like may be used alone or in combination of two or more. This base paper contains sizing agents, paper strength agents, fillers, antistatic agents, fluorescent whitening agents,
Additives such as dyes are blended.

Further, a surface sizing agent, a surface strengthening agent, a fluorescent whitening agent, an antistatic agent, a dye, an anchoring agent and the like may be coated on the surface.

The thickness of the base paper is not particularly limited, but preferably has good surface smoothness, such as by applying pressure by using a calender or the like during or after paper making, and the basis weight is 30 to 250 g / m ² is preferred.

As the resin of the resin-coated paper, a polyolefin resin or a resin curable by an electron beam can be used.
Examples of the polyolefin resin are low-density polyethylene, high-density polyethylene, polypropylene, polybutene, a homopolymer of an olefin such as polypentene or a copolymer of two or more olefins such as an ethylene-propylene copolymer and a mixture thereof, Those having various densities and melt viscosity indices (melt index) can be used alone or in combination.

In the resin of the resin-coated paper, white pigments such as titanium oxide, zinc oxide, talc and calcium carbonate; fatty acid amides such as stearamide and arachidic amide; zinc stearate; calcium stearate; Aluminum, fatty acid metal salts such as magnesium stearate, antioxidants such as Irganox 1010 and Irganox 1076, blue pigments and dyes such as cobalt blue, ultramarine blue, cecilian blue, and phthalocyanine blue, cobalt violet, fast violet, and manganese purple It is preferable to add various additives such as magenta pigments and dyes, fluorescent brighteners and ultraviolet absorbers in an appropriate combination.

The resin-coated paper, which is preferably used in the present invention, is produced by a so-called extrusion coating method in which, in the case of a polyolefin resin, a heat-melted resin is cast on a running base paper, and both sides of the resin are coated with a resin. Coated. In the case of a resin that is cured by an electron beam, the resin is applied by a commonly used coater such as a gravure coater or a blade coater, and then irradiated with an electron beam to cure and coat the resin. Further, before coating the resin on the base paper, the base paper is preferably subjected to an activation treatment such as a corona discharge treatment or a flame treatment. The surface (surface) of the support on which the ink receiving layer is applied has a glossy surface, a matte surface, and the like, depending on the application, and the glossy surface is used particularly advantageously. It is not necessary to coat the back surface with a resin, but it is preferable to coat the resin from the viewpoint of curling prevention. The back surface is usually a matte surface, and the front surface or both front and back surfaces can be subjected to an activation treatment such as a corona discharge treatment or a flame treatment as required. The thickness of the coating resin layer is not particularly limited, but is generally 5 to 50 μm thick on the surface or on both sides.

The support in the present invention can be coated with various back coat layers for antistatic properties, transport properties, curling prevention properties, and the like. The back coat layer can contain an inorganic antistatic agent, an organic antistatic agent, a hydrophilic binder, a latex, a curing agent, a pigment, a surfactant and the like in an appropriate combination.

[0039]

EXAMPLES The present invention will be described below in detail with reference to examples, but the contents of the present invention are not limited to the examples. In addition, "parts" means parts by weight.

Example 1 On a resin-coated paper support shown below, an ink receiving layer coating solution shown below was applied by a multilayer extrusion method at a coating amount of 50 g / m ^{2 for the} upper layer and a coating amount for the lower layer. 50g /
Immediately after the simultaneous application at m ^2, cool set for 10 seconds, then pass through a drying zone with gradually higher temperature,
An ink jet recording sheet was prepared by controlling the temperature and humidity of the drying zone so that the surface wet bulb temperature was 20 ° C. or lower. The composition of the ink receiving layer coating liquid is as shown below.

Liquid composition of upper layer Lime-treated gelatin (8% aqueous solution) 49 parts Polyvinylpyrrolidone K-30 (8% aqueous solution) 49 parts Di-2-ethylhexyl sodium sulfosuccinate (1% aqueous solution) 2 parts

Liquid Composition of Lower Layer Lime-treated gelatin (8% aqueous solution) 49.5 parts Carboxymethyl cellulose (8% aqueous solution) 49.5 parts Di-2-ethylhexyl sodium sulfosuccinate (1% aqueous solution) 1 part

Resin-coated paper: LBKP (50 parts) and LBS
A resin composition comprising low-density polyethylene (70 parts), high-density polyethylene (20 parts) and titanium oxide (10 parts) was coated on the surface of a 120 g / m ² base paper made of pulp containing P (50 parts) at 25 g / m ^2. m ² was coated, the back surface dense polyethylene (50 parts) and low-density polyethylene resin coated paper a resin composition formed by 25 g / m ² coating consisting of (50 parts).

Example 2 An ink jet recording sheet was produced in the same manner as in Example 1 except that the composition of the coating liquid for the ink receiving layer was as shown below.

Liquid composition of upper layer Lime-processed gelatin (8% aqueous solution) 49 parts Polyvinyl alcohol PVA117 (8% aqueous solution) 49 parts Di-2-ethylhexyl sodium sulfosuccinate (1% aqueous solution) 2 parts

Liquid Composition of Lower Layer Lime-treated gelatin (8% aqueous solution) 49.5 parts Carboxymethylcellulose (8% aqueous solution) 49.5 parts Di-2-ethylhexyl sodium sulfosuccinate (1% aqueous solution) 1 part

Example 3 An ink jet recording sheet was prepared in the same manner as in Example 1 except that the composition of the coating liquid for the ink receiving layer was as shown below.

Liquid composition of upper layer Lime-processed gelatin (8% aqueous solution) 49 parts Polyacrylamide (8% aqueous solution) 49 parts Di-2-ethylhexyl sodium sulfosuccinate (1% aqueous solution) 2 parts

Liquid Composition of Lower Layer Lime-processed gelatin (8% aqueous solution) 49.5 parts Carboxymethylcellulose (8% aqueous solution) 49.5 parts Di-2-ethylhexyl sodium sulfosuccinate (1% aqueous solution) 1 part

Example 4 An ink jet recording sheet was prepared in the same manner as in Example 1 except that the composition of the ink receiving layer coating solution was as shown below.

Liquid composition of upper layer Lime-processed gelatin (8% aqueous solution) 49 parts Polyvinylpyrrolidone K-30 (8% aqueous solution) 49 parts Di-2-ethylhexyl sodium sulfosuccinate (1% aqueous solution) 2 parts

Liquid Composition of Lower Layer Lime-processed gelatin (8% aqueous solution) 49.5 parts Hydroxyethyl cellulose (8% aqueous solution) 49.5 parts Di-2-ethylhexyl sodium sulfosuccinate (1% aqueous solution) 1 part

Example 5 An ink jet recording sheet was prepared in the same manner as in Example 1 except that the composition of the coating liquid for the ink receiving layer was as shown below.

Liquid Composition of Upper Layer Lime-processed gelatin (8% aqueous solution) 49 parts Polyvinylpyrrolidone K-30 (8% aqueous solution) 49 parts Di-2-ethylhexyl sodium sulfosuccinate (1% aqueous solution) 2 parts

Liquid Composition of Lower Layer Lime-processed gelatin (8% aqueous solution) 49.5 parts Methylcellulose (8% aqueous solution) 49.5 parts Di-2-ethylhexyl sodium sulfosuccinate (1% aqueous solution) 1 part

Example 6 A drying method, a liquid composition of an upper layer, and a lower layer, except that the coating liquid for an ink receiving layer was simultaneously applied by a multilayer extrusion method at a coating amount of 25 g / m ^{2 for} an upper layer and 75 g / m ^{2 for} a lower layer. An ink jet recording sheet was prepared in the same manner as in Example 1 with respect to the liquid composition of Example 1.

Example 7 A drying method, a liquid composition of an upper layer, and a lower layer, except that an ink receiving layer coating liquid was simultaneously applied by a multilayer extrusion method at a coating amount of 18 g / m ^{2 for} an upper layer and 82 g / m ^{2 for} a lower layer. An ink jet recording sheet was prepared in the same manner as in Example 1 with respect to the liquid composition of Example 1.

Example 8 A drying method, a liquid composition of an upper layer, and a lower layer, except that the coating liquid for the ink receiving layer was simultaneously applied by a multilayer extrusion method at a coating amount of the upper layer of 75 g / m ² and a coating amount of the lower layer of 25 g / m ² . An ink jet recording sheet was prepared in the same manner as in Example 1 with respect to the liquid composition of Example 1.

Example 9 A drying method, a liquid composition of an upper layer, and a lower layer, except that the coating liquid for an ink receiving layer was simultaneously applied by a multilayer extrusion method at a coating amount of an upper layer of 82 g / m ² and a coating amount of a lower layer of 18 g / m ² . An ink jet recording sheet was prepared in the same manner as in Example 1 with respect to the liquid composition of Example 1.

Example 10 The resin-coated paper used for the support in Example 1 was applied to a film having a thickness of 10
An ink jet recording sheet was produced in the same manner as in Example 1 except that the support was changed to a polyethylene terephthalate film support of 0 μm.

Comparative Example 1 A coating solution of the ink receiving layer shown below was applied on a resin-coated paper used as a support in Example 1 by an extrusion method at a coating amount of 100 g / m ² , and then immediately cooled and set for 10 seconds. Then, the ink was passed through a drying zone where the temperature was gradually higher, and the temperature and humidity of the drying zone were controlled so that the surface wet bulb temperature was 20 ° C. or lower, thereby producing an ink jet recording sheet. The composition of the ink receiving layer coating liquid is as shown below.

Composition of Coating Liquid Lime-processed gelatin (8% aqueous solution) 49 parts Polyvinylpyrrolidone K-30 (8% aqueous solution) 49 parts Di-2-ethylhexyl sodium sulfosuccinate (1% aqueous solution) 2 parts

Comparative Example 2 An ink jet recording sheet was prepared in the same manner as in Comparative Example 1 except that the composition of the coating liquid for the ink receiving layer was as shown below.

Composition of Coating Liquid Lime-treated gelatin (8% aqueous solution) 49 parts Carboxymethylcellulose (8% aqueous solution) 49 parts Di-2-ethylhexyl sodium sulfosuccinate (1% aqueous solution) 2 parts

Comparative Example 3 An ink jet recording sheet was produced in the same manner as in Comparative Example 1 except that the composition of the coating liquid for the ink receiving layer was as shown below.

Liquid Composition of Upper Layer Lime-treated gelatin (8% aqueous solution) 98 parts Di-2-ethylhexyl sodium sulfosuccinate (1% aqueous solution) 2 parts

Liquid Composition of Lower Layer Lime-processed gelatin (8% aqueous solution) 49.5 parts Carboxymethyl cellulose (8% aqueous solution) 49.5 parts Di-2-ethylhexyl sodium sulfosuccinate (1% aqueous solution) 1 part

Comparative Example 4 An ink jet recording sheet was prepared in the same manner as in Comparative Example 1 except that the composition of the coating liquid for the ink receiving layer was as shown below.

Liquid composition of upper layer Lime-processed gelatin (8% aqueous solution) 49 parts Polyvinylpyrrolidone K-30 (8% aqueous solution) 49 parts Di-2-ethylhexyl sodium sulfosuccinate (1% aqueous solution) 2 parts

Lower layer liquid composition Lime-processed gelatin (8% aqueous solution) 99 parts Di-2-ethylhexyl sodium sulfosuccinate (1% aqueous solution) 1 part

Comparative Example 5 An ink jet recording sheet was prepared in the same manner as in Comparative Example 1 except that the composition of the coating liquid for the ink receiving layer was as shown below.

Liquid Composition of Upper Layer Polyvinylpyrrolidone K-30 (8% aqueous solution) 48 parts Di-2-ethylhexylsulfosuccinate sodium (1% aqueous solution) 2 parts

Liquid Composition of Lower Layer Carboxymethylcellulose (8% aqueous solution) 49 parts Di-2-ethylhexyl sodium sulfosuccinate (1% aqueous solution) 1 part

Comparative Example 6 An ink jet recording sheet was prepared in the same manner as in Comparative Example 1, except that the composition of the coating liquid for the ink receiving layer was as shown below.

Composition of Coating Solution Lime-treated gelatin (8% aqueous solution) 32.6 parts Polyvinylpyrrolidone K-30 (8% aqueous solution) 32.6 parts Carboxymethylcellulose (8% aqueous solution) 32.6 parts Di-2-ethylhexylsulfosuccinate Acid soda (1% aqueous solution) 2.2 parts

Comparative Example 7 An ink jet recording sheet was prepared in the same manner as in Comparative Example 1 except that the composition of the coating liquid for the ink receiving layer was as shown below.

Liquid Composition of Upper Layer Lime-treated gelatin (8% aqueous solution) 49 parts Carboxymethyl cellulose (8% aqueous solution) 49 parts Di-2-ethylhexyl sodium sulfosuccinate (1% aqueous solution) 2 parts

Liquid Composition of Lower Layer Lime-processed gelatin (8% aqueous solution) 49.5 parts Polyvinylpyrrolidone K-30 (8% aqueous solution) 49.5 parts Di-2-ethylhexylsulfosuccinate sodium (1% aqueous solution) 1 part

An evaluation image was printed on each sheet obtained as described above using an MJ-900C (EPSON) ink jet printer, and the following quality tests were performed. The results are shown in Table 1.

Solid printing portion unevenness: Y, M, C, R, G,
Each of the B and K colors was output to a size of 3 cm × 5 cm at a density of 100%, and the image portion was visually observed to determine whether or not there was unevenness observed in the printed portion of each color. The evaluation criteria are as follows.

A: Excellent without any problem. ：: Excellent. Δ: Can be used. ×: poor

Bleeding: A single color or a multicolor was continuously recorded, and it was visually determined whether or not adjacent print portions flowed to each other or to one side. The evaluation criteria are as follows.

A: Excellent without any problem. ：: Excellent. Δ: Can be used. ×: poor

Gloss in printed area: The same image as that used in the uniform image area unevenness was measured for the 60-degree gloss of each color, and the average value was calculated. The higher the numerical value, the higher the gloss and the more preferable.

[0085]

[Table 1]

As is clear from the results from Table 1, the ink jet recording sheet of the present invention showed good results in all the evaluation items.

[0087]

According to the present invention, the sharpness, resolution,
An ink jet recording sheet excellent in uniformity and ink adsorbability can be provided.

Claims (9)

[Claims] 1. An ink jet recording sheet having an ink receiving layer provided on at least one surface of a support, wherein at least two or more ink receiving layers containing gelatin are provided, and gelatin is further provided on the upper layer. An ink jet recording sheet comprising at least one hydrophilic vinyl polymer, and a lower layer further comprising at least one water-soluble cellulose derivative in gelatin. 2. The ink jet recording sheet according to claim 1, wherein the hydrophilic vinyl polymer is selected from polyvinyl pyrrolidone, a polyvinyl pyrrolidone derivative, polyvinyl alcohol, polyacrylamide, and polyacrylic acid. 3. The method according to claim 1, wherein the water-soluble cellulose derivative is selected from carboxymethyl cellulose, hydroxyethyl cellulose and methyl cellulose.
The sheet for inkjet recording according to the above. 4. The ink receiving layer according to claim 1, wherein the weight ratio of the upper layer to the lower layer is 2/8 to 8/2.
4. The ink jet recording sheet according to 2 or 3. 5. The ink jet recording sheet according to claim 1, wherein the ink receiving layer is applied simultaneously. 6. The paper according to claim 1, wherein the support is a resin-coated paper obtained by coating both sides of a paper with a resin.
6. The sheet for inkjet recording according to 3, 4 or 5. 7. The method according to claim 1, wherein the support is a film made of polyethylene terephthalate.
6. The inkjet recording sheet according to 2, 3, 4 or 5. 8. The ink jet recording sheet according to claim 6, wherein the resin is a polyolefin resin. 9. The ink-jet recording sheet according to claim 8, wherein the polyolefin resin is a polyethylene resin.