JP2002292995A - Medium to be recorded by ink jet for sublimation ink and transrer recording method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medium to be recorded by ink jet for a sublimation ink which is suitable for use in a recording process for obtaining a printed matter by superposing an image recorded by using an ink containing a sublimable dye on an arbitrary printing medium and heating to transfer the dye to the medium and having excellent ink absorbability, high color developing density of a printed matter obtained by transferring and an excellent strike through resistance. SOLUTION: The medium to be recorded by ink jet for the sublimation ink comprises the ink acceptive layer containing at least a silica pigment, a water soluble adhesive and a latex adhesive and having a glass transition temperature (Tg) of the latex adhesive of a range of -20 to 20 deg.C. It is preferred that a secondary particle size of the pigment is 2 to 6 μm. The medium preferably comprises at least one or more strike through layer provided on an opposite side via a support. It is preferred that the surface pH of the layer is 7.1 or more.

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 medium for recording using an ink containing a sublimable dye, and more particularly, to a method of superposing on an arbitrary print medium and heating after ink jet recording. And a recording method for transferring a sublimable dye to a print medium.

[0002]

2. Description of the Related Art Ink-jet recording is a method in which fine droplets of ink are made to fly and adhere to recording paper such as paper by various operating principles to record images and characters. It has features such as easy multi-coloring, great flexibility in recording patterns, and no need for development-fixing. It has rapidly spread in various uses as a recording device for various figures and color images including Chinese characters. I have. Further, an image formed by the multi-color ink jet system can obtain a record comparable to multi-color printing by a plate making system or printing by a color photographic system. In addition, in applications requiring a small number of copies, it is being widely applied to the field of full-color image recording because it is less expensive than the photographic technique.

A sublimation transfer printing method for preparing a transfer paper printed by gravure printing, offset printing or the like using an ink containing a sublimable dye and thermally transferring the transfer paper to a cloth or the like has been conventionally known.

On the other hand, a technique has been developed in which an image or the like created by ink jet recording is transferred to an arbitrary print medium to obtain a printed matter. For example, Japanese Patent Application Laid-Open No. 7-14891
No. 7, JP-A-7-179024, JP-A-9-179
290560, JP-A-10-24651,
JP-A-10-25672, JP-A-10-1638
No. 2, Japanese Patent Application Laid-Open No. 10-315695,
JP-A-1-2896, JP-A-11-314452, JP-A-2000-1044, etc. are provided with an ink jet recording image receiving layer, and the image receiving layer is easily separated from the support by heat, pressure or the like. Thus, a technique for transferring an image receiving layer to an arbitrary print medium together with an image receiving layer has been disclosed.

Further, a method has been disclosed in which ink-jet recording is performed using an ink containing a sublimable dye, and only the dye is transferred to an arbitrary print medium by heat or the like.
For example, Japanese Patent Application Laid-Open No. 53-55221 discloses a technique that obtains transfer paper using a sublimable ink, thereby eliminating the necessity of a printing plate and making it possible to manufacture a small lot of transfer paper at low cost. Is disclosed. Also, Japanese Patent Application Laid-Open
JP-A-58638 and JP-A-2000-15926 disclose a method of creating a mirror image image with an ink using a sublimable dye, superposing the image on an arbitrary print medium, heating the image, and sublimating and transferring the image to the print medium. Is disclosed. However, even if a conventional ink jet recording medium is used as the intermediate transfer medium, a sufficient dye transfer cannot always be obtained.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to superimpose an image recorded using an ink containing a sublimable dye on an arbitrary print medium and heat the image so that the sublimable dye is printed on the print medium. Provided is an ink jet recording medium which is suitable for use in a recording method for obtaining a printed matter by transferring, which has excellent ink absorbency, a high color density of a printed matter obtained by transferring, and excellent strike-through prevention. It is.

[0007]

According to the present invention, an ink receiving layer containing at least a silica pigment, a water-soluble adhesive and a latex-based adhesive is provided on a support, and the glass transition temperature of the latex-based adhesive is determined. (Tg) in the range of -20 ° C to 20 ° C.

The water-soluble adhesive for the ink receiving layer is preferably polyvinyl alcohol.

The silica pigment contained in the ink receiving layer preferably has a secondary particle diameter of 2 μm to 6 μm.

It is preferable that the ink jet recording medium has a back coating layer on the back surface.

The surface pH of the ink receiving layer is preferably 7.1 or more.

The ink jet recording medium of the present invention is subjected to ink jet recording using an ink containing a sublimation dye, and then superposed on an arbitrary print medium and heated to transfer the sublimation dye to the print medium. is there.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The following is a description of an ink jet recording medium and a method of transfer recording to a print medium according to the present invention.
This will be described in detail.

The material of the support used in the practice of the present invention is not limited as long as the support is provided with an ink receiving layer. That is, papers mainly composed of wood pulp, porous resin films made of a thermoplastic resin containing inorganic fine particles, nonwoven fabrics, fabrics, films, resin-coated papers, synthetic papers, and the like can be used. Preferably, it is paper containing wood pulp as a main component.

The ink receiving layer of the present invention has an ink receiving layer mainly containing a pigment, a water-soluble adhesive and a latex adhesive.

The pigments usable in the present invention include, for example, light calcium carbonate, heavy calcium carbonate, magnesium carbonate, magnesium hydroxide, 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,
Inorganic pigments such as colloidal alumina, alumina hydrate (such as pseudo-boehmite), aluminum hydroxide, lithopone, zeolite, hydrohaloysite, and magnesium hydroxide, styrene-based plastic pigment, acrylic-based plastic pigment, polyethylene, microcapsules, urea resin, Organic pigments such as melamine resin and the like can be mentioned. Among them, porous synthetic amorphous silica, porous calcium carbonate,
Porous magnesium carbonate, porous alumina (pseudo-boehmite, δ-alumina) and the like are preferable, and porous synthetic amorphous silica having a large pore volume is particularly preferable. Such synthetic amorphous silica is a microporous, amorphous fine particle in which a three-dimensional structure of SiO ₂ is formed by gelation of silicic acid,
It has a pore size of about 10 to 2000 angstroms.
The average secondary particle diameter of these synthetic amorphous silicas is 2 μm or more.
It is preferably 6 μm. Average secondary particle size is 2μm
If the average particle diameter is more than 6 μm, the color density of the transferred printed matter becomes low.

As such a synthetic amorphous silica, a commercially available one can be suitably used. For example, Mizukasil P-
526, Mizukacil P-801, Mizukasil NP-8,
Mizukacil P-802, Mizukasil P-802Y, Mizukasil C-212, Mizukacil P-73, Mizukacil P
-78A, Mizukacil P-78F, Mizukacil P-8
7, Mizukacil P-705, Mizukasil P-707, Mizukasil P-707D, Mizukasil P-709, Mizukasil C-402, Mizukasil C-484 (all manufactured by Mizusawa Chemical), Toksil U, Toksil UR, Toksil G
U, Toksil AL-1, Toksil GU-N, Toksil N, Toksil NR, Toksil PR, Solex, Fine Seal E-50, Fine Seal T-3
2, Fine Seal X-37, Fine Seal X-7
0, Fine Seal RX-70 Fine Seal A, Fine Seal B (all manufactured by Tokuyama), Carplex F
PS-101, carplex CS-7, carplex 80, carplex XR, carplex 67 (all manufactured by Shionogi & Co., Ltd.), thyroid 63, thyroid 6
5, thyroid 66, thyroid 77, thyroid 7
4, thyroid 79, thyroid 404, thyroid 6
20, thyroid 800, thyroid 150, thyroid 244, and thyroid 266 (all manufactured by Fuji Silysia Chemical Ltd.).

Examples of the water-soluble adhesive which can be used in the present invention include starch derivatives such as starch, oxidized starch, cationized starch, etherified starch, phosphated starch, carboxymethylcellulose, hydroxymethylcellulose, hydroxyethylcellulose and cellulose. Cellulose derivatives such as sulfate, polyvinyl alcohol of various degrees of saponification or silanol modified products thereof, various derivatives such as carboxylated products, cationized products, casein, gelatin, denatured gelatin, natural polymers such as soy protein, polyvinylpyrrolidone, sodium polyacrylate , Styrene-
Water-soluble synthetic polymers such as maleic anhydride copolymer sodium salt and polystyrene sodium sulfonate are used. Among these water-soluble adhesives, polyvinyl alcohol is preferably used.

The latex-based adhesive which can be used in the present invention includes a conjugated diene-based copolymer latex such as styrene-butadiene copolymer and methyl methacrylate-butadiene copolymer, and a polymer of acrylic acid ester and methacrylic acid ester. Acrylic polymer latex such as copolymer or copolymer, vinyl polymer latex such as ethylene-vinyl acetate copolymer, vinyl chloride-vinyl acetate copolymer, or functional group such as carboxy group of these various polymers A functional group-modified polymer latex based on a contained monomer, a polyurethane resin-based latex, or the like can be used. In the present invention, among these latex-based adhesives, those having a glass transition temperature (Tg) in the range of −20 ° C. to 20 ° C. are used.

The amount of the water-soluble adhesive to be added to the pigment is 3 to 70 parts by weight, preferably 5 to 50 parts by weight based on 100 parts by weight of the total solid content of the pigment. The coating layer strength of the receiving layer is insufficient, and if it exceeds 70 parts by weight, the ink absorbency decreases.

Further, the ink receiving layer contains, as an additive,
Dye fixing agents (various cationic resins), pigment dispersants, thickeners, flow improvers, defoamers, defoamers, release agents, sizing agents, penetrants, coloring dyes, coloring pigments, fluorescent whitening Agents, ultraviolet absorbers, antioxidants, preservatives, anti-binders, wet strength enhancers, dry strength enhancers, and the like can also be appropriately compounded.

The surface pH of the ink receiving layer is preferably 7.1 or more. When the pH is less than 7.1, the ink is fixed in the ink receiving layer, and the transfer efficiency of the dye when transferred to a print medium is reduced, so that the ink absorption and the dye transferability are deteriorated.

In the present configuration, if the coating amount of the ink receiving layer is too small, not only will there be a problem in the ink absorbency, but also the image density, color and sharpness will be low, and the ink will not spread in the surface direction of the ink receiving layer. The dot shape is deteriorated, called feathering, which is diffused and jagged like a bird. Also, if the coating amount is too large, the drying load in the drying step after coating increases, and not only does the productivity decrease due to the decrease in the coating speed, but also the coating composition constituting the ink receiving layer when drying under a high load. The adhesive inside moves to the surface of the ink receiving layer together with the solvent that evaporates, and reduces the amount of voids on the surface. Therefore, it is not preferable. From such a viewpoint, the coating amount of the ink receiving layer is 1 to 30 g.
/ M ² is preferred. In addition, the ink receiving layer can be applied in a certain application amount in several times, and when applying gloss in post-processing, the gloss is improved as compared to applying the application amount at once.

The method for applying the ink-receiving layer is as follows. Various apparatuses such as a blade coater, a roll coater, an air knife coater, a bar coater, a rod blade coater, a curtain coater, a short dwell coater, and a size press are used on-machine or off-machine. Can be used. After the application, the ink receiving layer can be formed by flattening and applying a glossy finish using a calender such as a machine calender, a TG calender, a super calender, and a soft calender.

When the ink receiving layer is applied, the ink absorbing layer may be provided on the support as it is, or a known surface activation treatment such as a corona treatment, a flame treatment, a plasma treatment, or an ultraviolet irradiation treatment may be performed in advance. It can be applied later.

The backing layer in the present invention refers to at least one layer mainly coated with a resin, which is provided on the opposite surface of the ink receiving layer via the air-permeable support. The backing layer is a coating layer which is coated to transfer the sublimable dye and prevent strike-through, and contains an aqueous resin or a non-aqueous resin and, if necessary, a pigment.

As the aqueous resin, for example, starch derivatives such as starch, oxidized starch, cationized starch, etherified starch, and phosphated starch, carboxymethyl cellulose,
Hydroxymethyl cellulose, hydroxyethyl cellulose, cellulose derivatives such as cellulose sulfate,
Polyvinyl alcohol of various degrees of saponification or silanol modified products thereof, carboxylated products, various derivatives such as cationized products, casein, gelatin, denatured gelatin, natural polymers such as soy protein, polyvinylpyrrolidone, sodium polyacrylate, styrene-maleic anhydride Water-soluble synthetic polymers such as copolymer sodium salt and polystyrene sodium sulfonate are used. Further, styrene-butadiene copolymer, conjugated diene copolymer latex such as methyl methacrylate-butadiene copolymer, acrylic polymer latex such as acrylate and methacrylate polymer or copolymer, ethylene- Vinyl-based polymer latex such as vinyl acetate copolymer, vinyl chloride-vinyl acetate copolymer, or functional group-modified polymer latex with functional group-containing monomer such as carboxy group of these polymers, polyurethane resin Latex, melamine resin, thermosetting synthetic resin such as urea resin and the like can be used.

Examples of the non-aqueous resin include the following substances. Polyethylene such as high-density polyethylene, low-density polyethylene, medium-density polyethylene, and linear low-density polyethylene; isotactic, syndiotactic, atactic, mixtures thereof, random copolymers with ethylene or block copolymers, etc. Polypropylene; other poly-3-methylpentene-1, polyethylene glycol terephthalate, polyvinyl chloride, polyvinylidene chloride, polyisobutylene, ethylene-vinyl acetate copolymer and the like can be used alone or in combination.

The backing layer composed of a composition containing a non-aqueous resin as a main component can be provided by using a general laminator such as a melt extrusion die, a T die, a multilayer simultaneous extrusion die, or a hot melt coater. The coating amount of the backing layer is preferably determined by the thickness because it varies depending on the substance to be applied, and may be 5 μm or more.

When a pigment is added to the backing layer, the pigment is not particularly limited. For example, light calcium carbonate, heavy calcium carbonate, magnesium carbonate, magnesium hydroxide, kaolin, talc, calcium sulfate, barium sulfate , Titanium dioxide, zinc oxide, zinc sulfide, zinc carbonate, satin white, aluminum silicate, diatomaceous earth,
Inorganic pigments such as calcium silicate, magnesium silicate, synthetic amorphous silica, colloidal silica, alumina, colloidal alumina, pseudoboehmite, aluminum hydroxide, lithopone, zeolite, hydrohaloysite, magnesium hydroxide, styrene-based plastic pigment, and acrylic plastic Pigment, polyethylene, microcapsules, organic pigments such as urea resin and melamine resin. Among them, light calcium carbonate, heavy calcium carbonate, kaolin and the like are preferably used.

The amount of the pigment relative to the resin of the backcoat layer is 0 to 80 parts by weight, preferably 3 to 50 parts by weight, based on 100 parts by weight of the total solids. It is not preferable because temper may be difficult to adjust.

Further, a dye fixing agent (various cationic resins), a pigment dispersant, a thickener,
Flowability improvers, defoamers, foam inhibitors, release agents, sizing agents, penetrants, coloring dyes, coloring pigments, fluorescent brighteners, ultraviolet absorbers, antioxidants, preservatives, anti-foaming agents, wetting Strength enhancer,
A dry strength enhancer and the like can be appropriately compounded.

If the coating amount of the backing layer is too small, it is difficult to control the air permeability, and it is not preferable because not only the productivity is too low, but also the curling property is deteriorated. From such a viewpoint, the coating amount of the backcoat layer is 1 to 30 g /
m ² is preferred.

The method of applying the back coat layer includes various machines such as a blade coater, a roll coater, an air knife coater, a bar coater, a rod blade coater, a short dwell coater, a curtain coater, and a size press. Can be used. Further, after coating, finishing may be performed using a calendar such as a machine calendar, a TG calendar, a super calendar, and a soft calendar.

The backing layer may be provided after the ink receiving layer is provided or before the ink receiving layer is provided on the surface opposite to the surface on which the ink receiving layer is provided.

The air permeability of the support of the present invention is determined according to JIS P81.
It is measured by the Gurley air permeability specified in 17. The Gurley air permeability is preferably 70 seconds or more, and more preferably the Gurley air permeability is 100 seconds or more. There is no particular upper limit, and there may be little or no air permeability. The Gurley air permeability measures the time required for a certain amount of gas to permeate, and the longer the time, the poorer the air permeability. It is not clear why the poor air permeability is preferable as the ink jet recording medium of the present invention, but in the present invention, an image is transferred to the print medium by superposing an arbitrary print medium and the ink jet recording image surface and heating. Therefore, it is considered that the dye molecules diffused or sublimated by heat are efficiently transferred to the print medium. In other words, the dye molecules diffused or sublimated do not escape from the back and the efficiency of going to the print medium is improved. In addition, since the dye does not escape to the back, handling other than the print medium, especially the heating press device, is extremely easy, without staining.

The sublimation ink used in the present invention is a recording liquid in which a sublimable dye whose dye molecules are diffused or sublimated by heat is dispersed in the liquid. These sublimable dyes are 100
Any substance that can be transferred by sublimation, vaporization, diffusion and transfer with heat of about 250 ° C. to 250 ° C. may be used, and some of them are insoluble in water called disperse dyes. Hold and disperse in the liquid.

As the sublimable dye, there is a cationic dye or a disperse dye. For example, disperse dyes include azo-based and azo-derivatives, diarylmethane-based, triarylmethane-based, thiazole-based, methine-based, azomethine-based, xanthene-based, anthraquinone derivatives, quinophthalone derivatives, styrodipyran-based, indolinospiropyran-based, fluoran-based, Dyes of styryl type, diphenylmethane type, triphenylmethane type, oxazine type, triazine type, cyclidine type, diazine type, rhodamine lactam type and the like can be mentioned. In addition, "WHITE SERIES No.78 Sublimation type thermal transfer recording technology" (supervised by Nobuyoshi Taguchi, published by triceps, Inc.
(May 31, 1988) describes typical sublimable dyes.

These dyes may be used alone or in combination of two or more. These dyes are contained in fine resin particles and dispersed in a liquid to form an ink. For example, an ethylene-vinyl acetate copolymer is used as a resin, a disperse dye is dispersed in tetrahydrofuran, and the dispersion ink is added while being dispersed in a high-boiling saturated hydrocarbon, whereby a high-boiling solvent type ink can be obtained. It is also possible to create water-based inks.

In the preparation of a thermal transfer product using the ink jet recording medium of the present invention, a recording image surface of the recording medium is superimposed on a print medium which has been subjected to a treatment for improving the fixing property of a sublimable dye, and a thermal transfer press is used. Processing is performed using a machine at a transfer temperature and transfer time suitable for each print medium. Print media include film materials based on polyester films, metal materials such as aluminum and stainless steel, and polyester cloth materials.

[0041]

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.
Further, "parts" and "%" shown in Examples are parts by weight and% by weight unless otherwise specified.

<Preparation of air-permeable support> Freeness 450 ml
70 parts of LBKP of CSF, freeness of 450 ml N of CSF
In 100 parts of wood pulp consisting of 30 parts of BKP, the ratio of light calcium carbonate / heavy calcium carbonate / talc is 30.
5 parts of / 35/35 pigment, 0.1 part of commercially available alkyl ketene dimer, 0.03 part of commercially available cationic acrylamide,
After preparing 10 parts of a commercially available cationized starch and 0.5 part of a sulfuric acid band, the paper is made using a Fourdrinier paper machine with a basis weight of 80 g / m ² , and the commercially available oxidized starch is dried with an inked size press at 5 g / m 2. ² and dried to obtain an air-permeable support. The Gurley air permeability was 30 seconds.

<Preparation of Ink Receiving Layer A> Ink Receiving Layer A
Is a synthetic amorphous silica (FINE SEAL X
37B, secondary particle diameter 3.8 μm: manufactured by Tokuyama Corporation) 100
Parts, polyvinyl alcohol (PVA117: Kuraray) 30 parts, latex-based adhesive (SN-346, Tg
15 ° C: 30 parts of Sumika A & L), solid content concentration 15%
Adjusted to obtain. Next, the composition was applied by an Aknife coater so as to have a dry coating amount of 9 g / m ^2, and this was subjected to a super calender treatment to prepare an ink receiving layer A. The surface pH of the ink receiving layer was 9.0.

<Preparation of Ink Receiving Layer B> Ink Receiving Layer B
Is a synthetic amorphous silica (Mizical P78)
-A, secondary particle size 3.0 μm: 100 parts by Mizusawa Chemical), polyvinyl alcohol (PVA, R1130: manufactured by Kuraray Co., Ltd.) 30 parts, latex adhesive (Sumikaflex 8)
80, Tg 30 ° C .: Sumitomo Chemical Co., Ltd.) and the solid content was adjusted to 15%. Next, the composition was applied by an air knife coater so as to have a dry coating amount of 9 g / m ² , and this was subjected to a super calender treatment to prepare an ink receiving layer B. The surface pH of the ink receiving layer was 9.5.

<Preparation of Ink Receiving Layer C> Ink Receiving Layer D
Is a synthetic amorphous silica (FINE SEAL X
-45, secondary particle diameter 4.3 μm: Tokuyama) 100 parts,
Polyvinylpyrrolidone (PVPK-90: BASF) 3
0 parts, latex adhesive (Sumika Flex 9Tg-
(20 ° C .: Sumitomo Chemical Co., Ltd.) and adjusted to a solid concentration of 18% using 30 parts. Next, the composition was applied by a curtain coater so as to have a dry application amount of 9 g / m ^2, and this was subjected to a super calender treatment to prepare an ink receiving layer C. The surface pH of the ink receiving layer was 9.0.

<Preparation of Ink Receiving Layer D>
Is a synthetic amorphous silica (Mizukasil P78)
F, secondary particle diameter 12 μm: 100 parts by Mizusawa Chemical Co., 30 parts by weight of polyvinyl alcohol (PVA117: Kuraray), latex adhesive (SN-346, Tg15 ° C .: Japan A & A)
L) It was obtained by adjusting the solid content concentration to 18% using 30 parts.
Next, the composition was applied by a curtain coater so as to have a dry coating amount of 9 g / m ^2, and this was subjected to a super calender treatment to prepare an ink receiving layer D. The surface pH of the ink receiving layer was 7.5.

<Preparation of Ink Receiving Layer E>
Is a synthetic amorphous silica (Mizukasil P78)
A, 100 parts of secondary particle diameter 3.0 μm: Mizusawa Chemical Co., 30 parts of polyvinyl alcohol (PVA117: Kuraray), latex adhesive (SN-346, Tg15 ° C .: Japan A)
& L) 30 parts, cationic fixing agent (Smileds Resin 1)
(001: Sumitomo Chemical Co., Ltd.) and adjusted to a solid content concentration of 18%. Next, the composition was applied by a curtain coater so as to have a dry coating amount of 9 g / m ^2, and this was subjected to a super calender treatment to prepare an ink receiving layer E. The pH of the surface of the ink receiving layer was 5.5.

<Back Coating Layer 1> Coating Composition 1 for Back Coating Layer
Is a 15% solution of polyvinyl alcohol (PVA117: manufactured by Kuraray). Then, the composition was applied by an air knife coater so as to have a dry coating amount of 8 g / m ² , to obtain a backcoat layer 1.

<Back Coating Layer 2> Coating Composition 2 for Back Coating Layer
Is polyvinyl alcohol (PVA117: Kuraray)
40 parts, kaolin 100 parts, dispersant 0.1 part
And a solid content concentration of 20%. Then the composition
With an air knife coater for dry coating 8g / m ^TwoWhen
Coating was performed so as to obtain a backcoat layer 2.

<Back Coating Layer 3> Coating Composition 3 for Back Coating Layer
Was obtained by adjusting 100 parts of commercially available primary kaolin, 10 parts of commercially available styrene-butadiene latex, and 5 parts of commercially available oxidized starch at a solid content concentration of 50%. Then, the composition was applied by an air knife coater so as to have a dry coating amount of 8 g / m ² to obtain a backcoat layer 3.

<Back Coating Layer 4> Polypropylene was provided to a thickness of 10 μm by using a melt extrusion die, and was pressed against a cooling roll having a rough surface to cool it, whereby a back coating layer 4 was obtained.

Examples 1 to 4 As shown in Table 1, an ink-receiving layer A was provided on a gas-permeable support.
Was provided, and then the backcoat layers 1 to 4 were provided on the respective ink receiving layers to obtain ink jet recording media of Examples 1 to 4.

Example 5 As shown in Table 1, an ink receiving layer B was formed on a gas-permeable support.
Was provided, and then the backing layer 1 was provided on the ink receiving layer to obtain an ink jet recording medium of Example 5.

Example 6 As shown in Table 1, an ink-receiving layer C was provided on a gas-permeable support.
Was provided, and then the backing layer 1 was provided on the ink receiving layer to obtain an ink jet recording medium of Example 6.

Example 7 As shown in Table 1, an ink receiving layer D was provided on a gas-permeable support.
Was provided, and then the backcoat layer 1 was provided on the ink receiving layer, to obtain an ink jet recording medium of Example 7.

Example 8 As shown in Table 1, an ink receiving layer E was formed on a gas-permeable support.
Was provided, and then the backcoat layer 1 was provided on the ink receiving layer to obtain an ink jet recording medium of Example 8.

Example 9 As shown in Table 1, an ink receiving layer B was provided on a film in place of the air-permeable support to obtain an ink jet recording medium of Example 9.

Comparative Example 1 In Example 1, 100 parts of commercially available primary kaolin (Amazon SD: Kadam) was used for the ink receiving layer instead of the silica pigment in the ink receiving layer. A recording medium was obtained.

Comparative Example 2 An ink jet recording medium of Comparative Example 2 was obtained in the same manner as in Example 1 except that polyvinyl alcohol as a water-soluble adhesive in the ink receiving layer was omitted.

Comparative Example 3 An ink jet recording medium of Comparative Example 3 was obtained in the same manner as in Example 1 except that the latex adhesive in the ink receiving layer was removed.

Comparative Example 4 Comparative Example 4 was obtained in the same manner as in Example 1 except that the latex adhesive in the ink receiving layer was replaced by Tg 40 ° C. (SN-348: A & L Japan).

Comparative Example 5 Comparative Example 5 was obtained in the same manner as in Example 1 except that the latex adhesive in the ink receiving layer was replaced by Tg-40 ° C. (SN-349: A & L Japan).

The evaluation of the strike-through prevention property, ink receptivity and color density of the transferred product shown in Table 1 was carried out by the following methods.

<Preparation of Ink for Evaluation>
15 parts of the dye of Chemical Formula 3 was dispersed in a mixture of 5 parts of sodium polyoxyethylene alkyl ether sulfate, 75 parts of ion-exchanged water and 5 parts of diethylene glycol, and pulverized with a sand grinder (1 mm diameter zirconium beads) for 3 hours.
This dispersion is further added to a Fluoropore filter (FP-25).
0) to obtain a disperse dye solution, and 40 parts of this dispersion were added with 25 parts of thiodiglycol, 10 parts of diethylene glycol,
25 parts of ion-exchanged water were mixed and adjusted to pH 5 to 7 with acetic acid to prepare an aqueous sublimation dye dispersion ink of yellow, magenta, and cyan.

[0065]

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[0066]

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[0067]

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<Evaluation of Ink Acceptability> A photographic image of the above ink was recorded on a recording medium using an ink jet printer (JV2: Mimaki Co., Ltd.), and the degree of ink overflow was visually determined to determine the ink absorption. And the resolution were evaluated. A and B are good. A: Both ink absorption and resolution are good. B: Although the resolution is slightly inferior, there is no practical problem at all. C: The resolution is poor, and bleeding occurs. D: Both resolution and absorption are poor and bleeding is large.

<Evaluation of print-through preventing property> A print medium (white polyester film; Kiwa Chemical Co., Ltd.) on the recording image surface of the recording medium used for the evaluation of ink receptivity, which has been subjected to a treatment for improving the fixing property of a sublimable dye. The same white polyester film is also superimposed on the back side for evaluation of strikethrough, and heated at 140 ° C. for 5 minutes using a thermal transfer press (manufactured by INSTA; manual wide swinger Model 221) to be sublimated. The dye was transferred to a print medium (white polyester film). The density of the white polyester film for evaluation of strike-through was visually determined to evaluate the strike-through prevention. A and B without strikethrough are good. A: There is no strike-through of the sublimable dye. B: There is slight strike-through of the sublimable dye, but there is no practical problem at all. C: The strike-through of the sublimable dye is recognized, and set-off occurs. D: Many strike-throughs of the sublimable dye were observed, and set-off was severe and soiled the apparatus.

<Transfer Product Color Density> The optical density of the print medium, which was superimposed on the recording medium and heat-treated when the strike-through prevention was evaluated, was measured using an optical densitometer (TR12 manufactured by MACHBETH).
The measurement was performed in 24) and the relative comparison was performed. M or more is good.

[0071]

[Table 1]

As is clear from Table 1, Examples 1 to 4 contain a silica pigment, a water-soluble polymer, and a latex adhesive in the ink receiving layer. The latex-based adhesive has a glass transition temperature (Tg) in the range of -20 ° C to 20 ° C, and the silica pigment has an average secondary particle diameter of 2 µm to 6 µm.
m, and the water-soluble polymer is polyvinyl alcohol (hereinafter abbreviated as PVA). Further, the ink receiving layer has a surface pH of 7.1 or more and has a strike-through preventing layer. Therefore, Examples 1 to 4 are excellent in ink absorbency, excellent in color development during transfer, and excellent in strike-through prevention.

In Example 5, the ink receiving layer contains a silica pigment, a water-soluble polymer, and a latex adhesive. The silica pigment has an average secondary particle diameter of 2 μm to 6 μm, and the water-soluble polymer is PVA. Further, the ink receiving layer has a surface pH of 7.1 or more and has a strike-through preventing layer. However, the glass transition temperature (Tg) of the latex adhesive is 30 ° C., which is out of the range of −20 ° C. to 20 ° C. Therefore, Example 5 is excellent in color development during transfer and excellent in preventing strike-through, but is inferior to Example 1 in ink absorbency.

In Example 6, the ink receiving layer contains a silica pigment, a water-soluble polymer, and a latex adhesive. The silica pigment has an average secondary particle diameter of 2 μm to 6 μm, and the latex-based adhesive has a glass transition temperature (Tg).
Is in the range of -20C to 20C. Further, the ink receiving layer has a surface pH of 7.1 or more and has a strike-through preventing layer. However, the water-soluble polymer is not PVA but PVP
(Polyvinylpyrrolidone). Therefore, Embodiment 6
Is excellent in prevention of strike-through, but is inferior to Example 1 in ink absorbency and inferior in color development at the time of transfer to Example 1.

In Example 7, the ink receiving layer contains a silica pigment, a water-soluble polymer, and a latex adhesive. The water-soluble polymer is PVA, and the glass transition temperature (Tg) of the latex adhesive is in the range of -20 ° C to 20 ° C, and further has a strike-through preventing layer. However, the surface pH of the ink receiving layer is as low as 7.5, and the average secondary particle diameter of the silica pigment is 12 μm, which is outside the range of 2 μm to 6 μm. Therefore, Example 7 is also inferior to Example 1 in strike-through prevention property, ink absorbency, and color development at the time of transfer, as compared with Example 1.

In Example 8, the ink receiving layer contains a silica pigment, a water-soluble polymer, and a latex adhesive. The silica pigment has an average secondary particle diameter of 2 μm to 6 μm, the water-soluble polymer is PVA, and the latex adhesive has a glass transition temperature (Tg) in the range of −20 ° C. to 20 ° C., and And a strike-through prevention layer. However, the pH of the surface of the ink receiving layer is 5.5 and is not more than 7.1.
Therefore, Example 8 has a higher ink absorbency than Example 1,
The color development at the time of transfer is also inferior to Example 1.

In Example 9, an ink receiving layer was applied on a film. Silica pigment, water-soluble polymer in the ink receiving layer,
And a latex adhesive. The silica pigment has an average secondary particle diameter of 2 μm to 6 μm, the water-soluble polymer is PVA, and the latex adhesive has a glass transition temperature (Tg) in the range of −20 ° C. to 20 ° C., and ,
The surface pH of the ink receiving layer is 7.1 or more. And
No strike-through prevention layer is provided. Example 9 is inferior to Example 1 in ink absorbency as compared to Example 1.

Comparative Example 1 was inferior to Examples 1 to 9 in ink absorbency and color development during transfer, because the ink receiving layer did not contain a silica pigment.

In Comparative Example 2, since the ink receiving layer did not contain a silica pigment, the ink absorbing property and the color development at the time of transfer were inferior to those of Examples 1 to 9.

In Comparative Example 3, since the ink receiving layer did not contain a latex-based adhesive, the ink was inferior in the strike-through prevention, the ink absorbency, and the color development at the time of transfer as compared with Examples 1 to 9.

In Comparative Example 4, since the Tg of the latex adhesive in the ink receiving layer was 40 ° C., which was not within the range of −20 ° C. to 20 ° C., the ink absorbency was lower than that of Examples 1 to 9.
Poor color development during transfer.

In Comparative Example 5, since the Tg of the latex adhesive in the ink receiving layer was -40.degree. C., which was not within the range of -20.degree. C. to 20.degree. Poor color development at the time.

[0083]

According to the present invention, using an ink containing a sublimable dye,
In an ink-jet sublimation transfer printing method in which an intermediate transfer medium is prepared by ink-jet recording and heated and transferred to a print medium, the ink-receiving layer of the ink-jet recording medium contains at least a silica pigment, a water-soluble polymer adhesive, and a latex adhesive. When the latex-based adhesive has a glass transition temperature in the range of −20 ° C. to 20 ° C., an image formed by the ink jet printer has good ink absorbency, and a transferred product having a high optical density can be obtained. Further, by providing a back coat layer on the back surface of the ink receiving layer, scattering of the sublimation dye during transfer is prevented, and contamination of the transfer machine is prevented.

Claims (6)

[Claims] An ink jet recording medium comprising an ink receiving layer containing at least a silica pigment, a water-soluble adhesive and a latex adhesive on a support,
The latex-based adhesive has a glass transition temperature (Tg) of -2.
An inkjet recording medium for sublimation ink, which is in a range of 0 ° C to 20 ° C. 2. The ink jet recording medium for sublimation ink according to claim 1, wherein said water-soluble adhesive is polyvinyl alcohol. 3. The silica pigment has an average secondary particle diameter of 2 μm.
The inkjet recording medium for sublimation ink according to any one of claims 1 and 2, wherein the thickness is from 6 to 6 m. 4. The ink jet recording medium for sublimation ink according to claim 1, further comprising a back coat layer on the back surface of the support. 5. The ink jet recording medium for sublimation ink according to claim 1, wherein the surface pH of the ink receiving layer is 7.1 or more. 6. A method according to claim 1, wherein the recording medium is ink-jet-recorded using an ink containing a sublimation dye, and then superposed on an arbitrary print medium and heated to transfer the sublimation dye to the print medium. Recording method.