JP2003276309A - Ink-jet recording medium for sublimation ink and transfer recording method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ink-jet recording medium for sublimation ink which is applicable to a recording method for obtaining a print by transferring a subliming dye to a print medium by laying an image recorded by using an ink containing the dye on the print medium to overlap each other and heating them, excellent in cockling and ink absorbency, and high in the coloring density of the print obtained by the transfer. <P>SOLUTION: In the ink-jet recording sheet wherein the base paper containing wood pulp as a main component is coated with an ink receiving layer at least on one side, the base paper, in the Fenchen elongation testing device of the J.TAPPI No.27 B method, when paper and cardboard are manufactured by a paper machine, has one-minute wet elongation in the direction perpendicular to the advance direction of paper of 1.5% or below. The ink receiving layer preferably contains a water-soluble binder and amorphous silica 200 m<SP>2</SP>/g or below in specific surface area. <P>COPYRIGHT: (C)2003,JPO

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 sublimation dye, and more specifically, after ink jet recording, the recording medium is superposed on a print medium and heated.
The present invention relates to a recording method for transferring a sublimable dye to a print medium and an inkjet recording medium used for the recording method.

[0002]

2. Description of the Related Art The ink jet recording system is a system in which minute droplets of ink are ejected by various operating principles to adhere to recording paper such as paper to record images, characters, etc., but at high speed and low noise. It has features such as easy multicoloring, great flexibility in recording patterns, and no need for development-fixing. It has rapidly spread in various applications as a recording device for various figures and color images including Chinese characters. There is. Further, an image formed by a multicolor ink jet system can obtain a recording comparable to that of multicolor 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 cheaper than the photographic technique.

One of the drawbacks of the ink jet recording system is its slow printing speed. In recent years, with the spread of ink jet recording methods, technical improvements have been made, and the printing speed has been remarkably increased. However, as a printer prints at high speed, there is a problem of cockling in which the printed portion is wavy due to the ink that has been ejected into the inkjet recording medium. If the cockling becomes severe, the printer head may rub against the raised part of the paper, the printed image may be contaminated, or the paper may break and the paper cannot be passed.

Inks are classified into a solvent type and an aqueous type, but most of them are aqueous inks because of their price, safety, easiness of handling, etc., and sublimation inks for ink jet also belong to the aqueous inks. The improvement of cockling by the solvent of the water-based ink that reaches the base paper is an important issue. At present, efforts to address this problem have not been sufficiently made, and a support containing wood pulp as a main component, which has a function as an ink absorber, is an important and early solution to inkjet recording media. It has become a task that must be done.

Further, a sublimation transfer printing method has been conventionally known in which an ink containing a sublimable dye is used to prepare a transfer paper printed by gravure printing, offset printing or the like, and the transfer paper is thermally transferred to a cloth or the like.

On the other hand, a technique for obtaining a printed matter by transferring an image or the like created by ink jet recording onto an arbitrary print medium has also been developed. For example, JP-A-7-14891
No. 7, JP-A No. 7-179024, and No. 9-
290560, JP-A-10-24651,
JP-A-10-25672, JP-A-10-1638
No. 2, JP-A-10-315695, and JP-A-1
In JP-A 1-428896, JP-A-11-314452, JP-A-2000-1044, etc., an ink jet recording image image receiving layer is provided, and the image receiving layer is easily peeled off from a support by heat, pressure or the like. Discloses a technique of transferring the entire image receiving layer onto a print medium.

Further, a method has been disclosed in which an ink containing a sublimable dye is used for ink jet recording and only the dye is transferred to a print medium by heat or the like. For example, in Japanese Patent Laid-Open No. 53-55221, a transfer plate is obtained by using a sublimable ink, so that a printing plate is not required, and even if a small lot of transfer paper is obtained, it can be manufactured at low cost. Is disclosed. In addition, JP-A-10-58
In Japanese Patent Laid-Open No. 638 and Japanese Patent Laid-Open No. 2000-15926,
A method is disclosed in which a mirror image image is formed with an ink using a sublimation dye, and the image is sublimated and transferred to a print medium by superposing the image on the print medium and heating the same. However, even if a conventional ink jet recording medium is used as the intermediate transfer medium, it is not always possible to obtain sufficient dye transfer. Further, even when the print medium is superposed on the inkjet recording medium in which cockling has occurred after printing as described above and heated, the transferred image is often distorted and the resolution is inferior.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to transfer an image recorded with an ink containing a sublimable dye onto a print medium by superposing the image on the print medium and heating the image. It is an object of the present invention to provide an inkjet recording medium suitable for use in a recording method for obtaining a printed matter, which has excellent cockling of a printed portion and ink absorption and has a high transfer density of a printed matter obtained by transfer.

[0009]

DISCLOSURE OF THE INVENTION The present invention provides an ink jet recording medium comprising a base paper made of wood pulp as a main component and an ink receiving layer applied on at least one side thereof. TAPPI No. 27 When the paper and paperboard are made with a paper machine by the Fenchel elasticity tester described in Method B, the water immersion elongation after 1 minute in the transverse direction perpendicular to the traveling direction of the paper is 1.5%. The following is an inkjet recording medium for sublimation ink.

It is preferable that the ink receiving layer contains a water-soluble binder and amorphous silica having a specific surface area of 200 m ² / g or less.

The water-soluble binder is polyvinyl alcohol, methyl cellulose, carboxymethyl cellulose,
At least one selected from hydroxypropyl cellulose, hydroxyethyl cellulose and hydroxymethyl cellulose is preferable.

Invention of a transfer recording method in which an ink containing a sublimation dye is used for ink jet recording on the ink jet recording medium of the present invention, and then the sublimation dye is transferred to the printing medium by heating by superimposing it on an arbitrary printing medium. Is.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The transfer recording method for an ink jet recording medium for sublimation ink and a print medium according to the present invention will be described in detail below.

The base paper of the present invention is manufactured by J. TAPPI No. Two
7 When making paper and paperboard with a paper machine using the Fenchel elasticity tester described in Method B, the water immersion elongation after 1 minute in the direction perpendicular to the paper traveling direction is controlled to be 1.5% or less. There is a need to. There are various methods to give the inundation elongation, but it can be roughly divided into two methods. One is a method by changing the addition amount of the internally added sizing agent and the coating amount of the surface sizing agent when manufacturing the base paper. This method is a method of controlling the elongation at the time of flooding by changing the wettability of the pulp fiber on the surface of the base paper or inside.

Another method is to change the void structure of the base paper. The Lucas-Washburn equation is well known as a model equation for permeation of a liquid into a capillary. In this equation, the liquid penetration depth is proportional to the time and the square root of the capillary radius, and It has been shown to be inversely proportional to the square root. In other words, select a pulp that can be more easily made into honey, select a beating condition for pulp, add a polymer to a stock slurry, use a multi-stage wet press, or use a coating device in the middle to apply a surface sizing agent or The purpose of the present invention is to reduce the voids (capillary radius) of the base paper by adjusting various papermaking conditions such as adding a water-soluble polymer or machine calendering after papermaking. This is one method.

In order to obtain a base paper having a water immersion elongation of 1.5% or less after 1 minute of the present invention, the following methods are used, and preferably two or more of the following methods are combined for papermaking. It was revealed by the study of the present inventors that the achievement of the above is suitable for the purpose of the present invention.

(1) As wood pulp, ordinary bleaching treatment of chlorine, hypochlorite, chlorine dioxide bleaching and alkali extraction or alkali treatment and, if necessary, oxidative bleaching treatment with hydrogen peroxide, oxygen, etc., And wood pulp of softwood pulp, hardwood pulp, softwood mixed wood mixed pulp that has been subjected to a combination treatment thereof is used,
Further, various kinds of kraft pulp, sulfite pulp, soda pulp and the like, and further used paper pulp and the like can be used. Of these pulps, a large amount of short-leaf hardwood pulp that is easy to form is used in a large amount, specifically 60% by weight or more, preferably 75% by weight or more of a hardwood pulp, and the long fiber content is reduced by a beater as much as possible. It is advantageous to be beaten to be used, or to mix and use waste paper pulp having a short fiber length.

(2) The base paper used in the practice of the present invention contains various additives when preparing a stock slurry. As a sizing agent, a fatty acid metal salt or fatty acid, an alkyl ketene dimer emulsion or an epoxidized higher fatty acid amide, an alkenyl or alkyl succinic anhydride emulsion, or a rosin derivative may be added alone or in combination in a relatively large amount, It is advantageous to obtain the base paper of the present invention. In addition, as a dry paper strength enhancer, anionic,
Cationic or amphoteric polyacrylamide, polyvinyl alcohol, cationized starch, vegetable galactomannan, etc., as a wet paper strength enhancer, polyamine polyamide epichlorohydrin resin, etc., as a filler, clay, kaolin, calcium carbonate, titanium oxide, etc., a fixing agent As
It is more advantageous to include caustic soda, sodium carbonate, sulfuric acid, etc. as a pH adjusting agent such as aluminum chloride, water-soluble aluminum salts such as vanadium sulfate, etc., and other color pigments, coloring dyes, optical brighteners, etc., in an appropriate combination. Is.

(3) Various surface sizing agents, water-soluble polymers, hydrophilic colloids or polymer latices are contained or coated in or on the base paper. Specifically, various surface sizing agents in or on the base paper,
It is preferable that the water-soluble polymer, hydrophilic colloid, or polymer latex is contained or applied as a solid coating amount of 1.0 g / m ² or more by size press or tab size press or coating such as blade coating or air knife coating. .

(4) After making the base paper, calendering is performed using a machine calender, a super calender, a thermal calender, or the like.

The thickness of the base paper used for carrying out the present invention is not particularly limited, but the basis weight is 40 to 300 g.
It can be appropriately selected within the range of / m ² . Preferably 80-280 g / m ² , more preferably 100-250
It is in the range of g / m ² .

It is considered that cockling generally causes swelling and stress relaxation of pulp constituting the base paper when water penetrates into the base paper, and locally produces unevenness when it is dried again. It is presumed that when the initial lateral water immersion elongation is extremely reduced as in the base paper of the present invention, the rapid pulp swelling and stress relaxation are extremely small, and the difference in unevenness generated is extremely small. It

Examples of the water-soluble binder used in the ink receiving layer of the present invention include polyvinyl alcohol, methyl cellulose, carboxymethyl cellulose, hydroxypropyl cellulose, hydroxyethyl cellulose and hydroxymethyl cellulose. It is preferable to use at least one water-soluble binder selected from calpolyvinyl alcohol, boxymethylcellulose, hydroxyethylcellulose, and methylcellulose in combination, from the viewpoints of ink receptivity, dot reproducibility, and prevention of stickiness in the printed portion. .

The degree of saponification and the degree of polymerization of the polyvinyl alcohol used in the present invention are not particularly limited, but polyvinyl alcohol having a degree of saponification of 86.5 mole% to 90 mole% is preferable.

Commercially available polyvinyl alcohol can be preferably used as the polyvinyl alcohol used in the ink receiving layer of the ink jet recording medium of the present invention. The following examples are given, but the present invention is not limited thereto. For example, PVA1
05, PVA110, PVA117, PVA117H,
PVA120, PVA124, PVA124H, PVA
CS, PVACST, PVAHC, PVA202, PV
A203, PVA204, PVA205, PVA21
0, PVA217, PVA220, PVA224, PV
A228, PVA235, PVA217EE, PVA2
17E, PVA220E, PVA224E, PVA42
0, PVA613 (above, made by Kuraray), C25, C2
0, C201, C17, A, C10, MA33, MA2
6, MA23, MA17, PA24, PA20, PA1
8, PA15, PA10 (above, manufactured by Shin-Etsu Chemical) and the like can be mentioned.

The carboxycellulose used in the ink receiving layer of the ink jet recording medium of the present invention preferably has an etherification degree of 0.4 to 2.5. As such carboxymethyl cellulose, commercially available products can be preferably used, and examples thereof include serogen 5A, serogen 6A, serogen 7A, serogen PR, and serogen WS-.
A, serogen PL-15, serogen WS-CN, serogen WS-C, serogen WS-D, serogen BS, serogen HH, serogen 3H, serogen 4H, serogen BS-
H, serogen BSH-3, serogen BSH-4, serogen BSH-5, serogen BSH-6, serogen BSH-
10, serogen BSH-12, serogen 6HS9, serogen EP, serogen HE-1500F (all manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) and the like.

The amorphous silica used in the ink receiving layer of the ink jet recording medium of the present invention has a specific surface area of 200.
Use m ² / g or less. As such amorphous silica, commercially available ones can be preferably used. For example, Midikacil P-
801, Mizukasil P-802, Mizukasil P-52
6, Mizukasil P-527, Mizukasil P-603, Mizukasil P-604 (manufactured by Mizusawa Chemical Industry Co., Ltd.) Fine seal E50, Fine seal E70, Fine seal T
32, fine seal P8, fine seal CMF (manufactured by Tokuyama Corp.) and the like.

In the present invention, if the specific surface area of the amorphous silica is larger than 200 m ² / g, the sublimation ink is excessively adsorbed to the silica pores, and the sublimation property of the ink is hindered during transfer. As a result, it is presumed that the transfer density is lowered when transferred to the print medium.

In the present invention, the blending amount of amorphous silica with respect to the water-soluble binder is 3-300 parts by weight, preferably 3-100 parts by weight, based on 100 parts by weight of the total solid content of the water-soluble binder. More preferably 50-80
Parts by mass. If the amount is less than 3 parts by mass, the ink absorbing ability of the ink receiving layer is remarkably insufficient, and if it exceeds 300 parts by mass, the transfer efficiency is remarkably reduced.

Further, as an additive to the ink receiving layer,
Dye fixing agents (various cationic resins), pigment dispersants, thickeners, fluidity improvers, defoamers, foam suppressors, release agents, sizing agents, penetrants, colored dyes, colored pigments, fluorescent whitening. An agent, an ultraviolet absorber, an antioxidant, an antiseptic agent, an antifungal agent, a wet strength enhancer, a dry strength enhancer and the like can also be appropriately added.

In the present invention, if the coating amount of the ink receiving layer is too small, not only does the problem of ink absorption occur, but the image density, color and sharpness are low, and the ink is spread in the surface direction of the ink receiving layer. There is a deterioration in the dot shape called feathering, which is diffused and jagged like bird feathers. Further, if the coating amount is too large, the drying load in the drying step after coating increases, and not only the productivity decreases due to the reduction in coating speed, but also the coating composition that constitutes the ink-receiving layer when dried under 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, so that the absorbability is reduced and scumming occurs at the time of recording, and the curling property deteriorates. 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. Further, the ink receiving layer can be applied by applying a certain fixed amount in several times, and may be cast after the post-treatment.

The method of applying the ink receiving layer is carried out by various machines such as various blade coaters, roll coaters, air knife coaters, bar coaters, rod blade coaters, curtain coaters, short dwell coaters and size presses on machine or off machine. Can be used. Further, after coating, it can be flattened by using a calendering machine such as a machine calender, a TG calender, a super calender, and a soft calender, and a further flattened ink-receiving layer can be formed by applying gloss finish.

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 corona treatment, flame treatment, plasma treatment or ultraviolet irradiation treatment may be performed in advance. It can be applied afterwards.

The sublimation ink used in the present invention is a recording liquid in which a sublimable dye in which dye molecules are diffused or sublimated by heat is dispersed in the liquid. These sublimable dyes are 100
Any material that can be transferred by being sublimated, vaporized, diffused by heat of about ℃ to 250 ℃, and may be insoluble in water called a disperse dye, and in that case, in dye-holding particles such as resin particles To be dispersed in the liquid.

Examples of sublimable dyes include cationic dyes and disperse dyes. For example, as the disperse dye, an azo type and an azo derivative, a diarylmethane type, a triarylmethane type, a thiazole type, a methine type, an azomethine type, a xanthene type, an anthraquinone derivative, a quinophthalone derivative, a styrodipyran type, an indolinospyropyran type, a fluorane type, Examples thereof include styryl dyes, diphenylmethane dyes, triphenylmethane dyes, oxazine dyes, triazine dyes, cyclidine dyes, diazine dyes, and rhodamine lactam dyes. In addition, "WHITE SERIES No.78 sublimation thermal transfer recording technology" (supervised by Nobuyoshi Taguchi, published by Trikeps Co., Ltd.,
(May 31, 1988), representative ones of sublimable dyes are described.

These dyes may be used not only as one component but also as a mixture of two or more kinds. These dyes are contained in fine resin particles and dispersed in a liquid to prepare an ink. For example, an ethylene-vinyl acetate copolymer is used as a resin, a disperse dye is dispersed in tetrahydrofuran, and the dispersion-type dye is added while being dispersed in a high-boiling point saturated hydrocarbon, whereby a high-boiling point solvent type ink can be obtained. It is also possible to make water-based inks as well.

The thermal transfer product is produced by using the ink jet recording medium of the present invention. The recording image surface of the recording medium is superposed 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. Using a machine, prepare by processing at a transfer temperature and transfer time suitable for each print medium. As a print medium usable in the present invention, a film material based on polyester film, aluminum,
There are metal materials such as stainless steel, polyester cloth materials, etc. When the inkjet recording medium of the present invention is used, the color density and the resolution of the transferred image are significantly improved.

[0038]

EXAMPLES Examples of the present invention will be described below, but the present invention is not limited to these examples.
Further, "parts" and "%" shown in the examples represent parts by mass and% by mass, unless otherwise specified.

<Preparation of base papers 1 to 4> A mixed pulp composed of 85% by mass of hardwood bleached kraft pulp and 15% by mass of softwood bleached sulfite pulp was beaten to 320 ml (C
SF), after beating to 100 parts by mass of pulp, 3 parts by mass of cationized starch, 0.2 part by mass of anionized polyacrylamide, 0.2 part by mass of alkyl ketene dimer emulsion (as ketene dimer content). (Base paper 1),
0.3 parts by mass (base paper 2), 0.4 parts by mass (base paper 3),
0.5 parts by mass (base paper 4) and 0.4 parts by mass of polyamide epichlorohydrin resin were added to prepare a stock slurry. After that, the stock slurry was formed into a web using a Fourdrinier paper machine, subjected to 3 stages of wet pressing in the wet part, treated with a smoothing roll, and then subjected to 2 stages of tight pressing in the drying part. Dried. After that, size-pressing with a carboxy-modified polyvinyl alcohol solution in the middle of drying to adjust the solid content to 2.0 g / m ² ,
The base paper finally obtained is dried so that the water content is 8% by mass with absolutely dry water, and machine calendering is performed to obtain a basis weight of 150.
A base paper for an inkjet recording medium having a water immersion elongation of g / m ^{2 shown} in Table 1 was produced.

Example 1 The coating composition for the ink receiving layer of Example 1 was 100 parts of polyvinyl alcohol (PVA224: manufactured by Kuraray), amorphous silica (Mizukasil P-562: specific surface area 140 m ² /
g: manufactured by Mizusawa Chemical Industry Co., Ltd.), using a solid content of 15 parts
It was obtained by adjusting to%. Next, the composition was coated on a base paper 1 by an air knife coater so that the dry coating amount was 5 g / m ^2, and this was supercalendered to prepare an inkjet recording medium of Example 1.

Example 2 The coating composition for the ink receiving layer of Example 2 was carboxymethyl cellulose (Serogen 5A: manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) 1
00 parts and 60 parts of amorphous silica (Mizukasil P-527: specific surface area 55 m ² / g: manufactured by Mizusawa Chemical Industry Co., Ltd.) were used to obtain a solid content concentration of 15%. Then, the composition was dried on the base paper 2 by an air knife coater to give a dry coating amount of 4 g /
Example 2 was prepared by applying a coating of m ² and subjecting it to supercalendering.

Example 3 An ink jet recording medium of Example 3 was produced in the same manner as in Example 1 except that the base paper 1 was changed to the base paper 3.

Example 4 In Example 4, an ink jet recording medium of Example 4 was prepared in the same manner as in Example 2 except that the base paper 2 was changed to the base paper 4.

Example 5 The coating composition for the ink receiving layer of Example 5 was 100 parts of hydroxyethyl cellulose (HEC Daicel SP200: manufactured by Daicel Chemical Industries Ltd.), amorphous silica (Fineseal E70: specific surface area 130 m ² / g: manufactured by Tokuyama) 30
Parts to obtain a solid content concentration of 10%. Then, the composition was coated on a base paper 4 with an air knife coater so that the dry coating amount was 4 g / m ^2, and this was supercalendered to prepare Example 5.

Example 6 The coating composition for the ink receiving layer of Example 6 was carboxymethyl cellulose (Serogen 5A: manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) 1.
It was obtained by using 00 parts and 100 parts of amorphous silica (Fineseal T32: specific surface area 160 m ² / g: manufactured by Tokuyama Corporation) and adjusting the solid content concentration to 15%. Next, the composition was dried on the base paper 4 by an air knife coater to give a dry coating amount of 4 g /
Example 6 was prepared by applying a coating of m ² and subjecting it to supercalendering.

Example 7 The coating composition for the ink receiving layer of Example 7 was 100 parts of polyvinyl alcohol (PVA420: manufactured by Kuraray Co., Ltd.) and amorphous silica (Fineseal T32: specific surface area 160 m ^2).
/ G: manufactured by Tokuyama Co., Ltd.), and the solid content concentration is 16
It was obtained by adjusting to%. Then, the composition was coated on the base paper 2 with an air knife coater so that the dry coating amount was 4 g / m ^2, and this was supercalendered to prepare Example 7.

Example 8 The ink-receiving layer coating composition of Example 8 was a polyvinyl acetate
100 parts of rucor (PVA220: Kuraray Co., Ltd.), amorphous
Quality silica (Mizukasil P-603: specific surface area 30 m²/
g: manufactured by Mizusawa Chemical Co., Ltd.), and the solid content concentration is 10%.
I got it adjusted. Then, the composition is treated with an air knife coater.
-Dry coating amount on base paper 2 by 4g / m ²So that
Example 8 after coating and supercalendering
It was made.

Example 9 The coating composition for the ink receiving layer of Example 9 was 100 parts of polyvinyl alcohol (PVA420: made by Kuraray), amorphous silica (Fineseal X45: specific surface area 240-28).
0 m ² / g: manufactured by Tokuyama Co., Ltd.) to obtain 80 parts and a solid content concentration of 17%. Then, the composition was coated on a base paper 4 with a curtain coater so that the dry coating amount was 10 g / m ^2, and this was supercalendered to prepare Example 9.

Comparative Example 1 Base paper 1 except that 0.1 part by weight of alkyl ketene dimer (as alkyl ketene dimer content) was used in Base paper 1
A base paper 5 was prepared in the same manner as in.

Comparative Example 1 was prepared in the same manner as Example 1 except that the base paper 1 was changed to the base paper 5 to prepare an ink jet recording medium of Comparative Example 1.

Comparative Example 2 100 parts of wood pulp consisting of 70 parts of hardwood bleached kraft pulp having a freeness of 450 ml (CSF) and 30 parts of softwood bleached sulfite pulp having a freeness of 450 ml (CSF) was added to 100 parts of light calcium carbonate / heavy pulp. Calcium carbonate / talc ratio 30/35/35 pigment 5 parts, alkyl ketene dimer 0.1 part, cationic acrylamide 0.03
Parts, cationized starch 1.0 part and sulfuric acid band 0.5 part were prepared, and then papermaking was carried out using a Fourdrinier paper machine at a basis weight of 80 g / m ² .
Oxidized starch dried with an Inclined size press 5
A base paper 6 was obtained by applying g / m ² and drying.

In Comparative Example 2, Comparative Example 2 was prepared in the same manner as Example 1 except that the base paper 1 was changed to the base paper 6.

The evaluation of the ink absorbency and the color density of the transferred material 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 mixed solution 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 mixed with a fluoropore filter (FP-25
0) to obtain a disperse dye solution, and 40 parts of this dispersion solution contains 25 parts of thiodiglycol and 10 parts of diethylene glycol.
25 parts of ion-exchanged water was mixed and the pH was adjusted to 5 to 7 with acetic acid to prepare a yellow, magenta, and cyan aqueous sublimation dye dispersion ink.

[0055]

[Chemical 1]

[0056]

[Chemical 2]

[0057]

[Chemical 3]

<Evaluation of ink acceptability> A photographic image was recorded on a recording medium using an ink jet printer (JV2: Mimaki Co., Ltd.), and the degree of ink overflow was visually judged to absorb ink. And the resolution were evaluated. A and B are good, C is inferior in practical use, and D is impractical. A: Good ink absorbency and resolution. B:
The resolution is slightly inferior, but there is no problem in practical use. C: The resolution is poor and bleeding occurs. D: Both resolution and absorptivity are poor, and bleeding is large.

<Transfer Coloring Density> When the prevention of strike-through was evaluated, the optical density of the print medium which was superposed on the recording medium and heat-treated was measured by an optical densitometer (TR12 manufactured by MACHBETH).
24), the relative comparison is performed and the higher one is H, M ⁺ ,
M, M ^-, was L. It is preferably M or more, and M ⁻ is the practical lower limit level.

<Evaluation of Cockling> With the inkjet printer JV2 used in the evaluation of ink acceptability, a monochromatic image having an ink coating amount of 200% or more was printed, and the cockling of the printed portion was visually evaluated. A and B were good, C was inferior in practical use, and D was not practical.

[0061]

[Table 1]

As is clear from Table 1, Examples 1 to 9 are papers containing wood pulp as a main component, and in an ink jet recording sheet having at least one surface coated with an ink receiving layer, the base papers are J. TAPPI No. 27
According to the Fenchel elasticity tester described in method B,
When making paper and paperboard with a paper machine, the water immersion elongation after 1 minute in a direction perpendicular to the direction of travel of the paper is 1.5% or less, and the ink receiving layer has a water-soluble binder and a specific surface area of 200 m. ^{Since the} amorphous silica is contained in an amount of ² / g or less, Examples 1 to 9 are excellent in ink absorbency and cockling, and are excellent in color development during transfer. However, in Example 9,
Since the amorphous silica having a specific surface area of 200 m ² / g or more is used, the transfer density is slightly inferior to those of Examples 1 to 8 probably because the sublimation ink is adsorbed to the pores of the amorphous silica. It became a result.

Comparative Examples 1 and 2 have a water immersion elongation of 2.2% and 3.
Since it exceeds 0% and 1.5%, the cockling of the printing portion is inferior to that of Examples 1-9.

[0064]

As described above, according to the present invention, an ink containing a sublimation dye is used to perform ink jet printing on an ink jet recording medium, and the image is superposed on the print medium and transferred by heating. The ink-jet recording medium for sublimation ink of the present invention is an ink-jet recording medium in which a paper containing wood pulp as a main component is used as a base paper and an ink receiving layer is applied to at least one surface of the paper. TAPPI No. 27
In the Fenchel elasticity tester described in Method B, the water immersion elongation after 1 minute in a direction perpendicular to the traveling direction of the paper is 1.5% or less in the case of making paper and paperboard with a paper machine. Further, it is preferable that the ink receiving layer contains a water-soluble binder and amorphous silica having a specific surface area of 200 m ² / g or less. Furthermore, it is preferable that the water-soluble binder is at least one selected from polyvinyl alcohol, methyl cellulose, carboxymethyl cellulose, hydroxypropyl cellulose, hydroxyethyl cellulose and hydroxymethyl cellulose. As a result, the ink formed by the inkjet printer has good ink absorbency, and the cockling during printing is good,
A transcript having a high optical density can be obtained.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) D21H 27/00 D21H 27/00 ZF term (reference) 2H086 BA01 BA15 BA21 BA26 BA33 BA35 BA41 BA48 BA56 3B005 EA01 EB05 EC11 FB23 FB25 FB26 FE01 FE13 GA02 GB01 4L055 AA02 AA03 AC06 AG18 AG40 AG46 AG64 AG87 AH02 AH11 AH17 AH37 AJ04 BB03 BE02 BE08 EA09 EA17 FA11 GA09 GA13 GA50

Claims (4)

[Claims] 1. An ink jet recording medium comprising a paper mainly composed of wood pulp as a base paper and having an ink receiving layer applied on at least one surface thereof, wherein the base paper is J. TA
PPI No. 27 When the paper and board are made into paper with a paper machine by the Fenchel elasticity tester described in Method B, the water immersion elongation after 1 minute in a direction perpendicular to the traveling direction of the paper is 1.5% or less. An inkjet recording medium for sublimation ink, characterized in that: 2. The ink jet recording medium for sublimation ink according to claim 1, wherein the ink receiving layer contains a water-soluble binder and amorphous silica having a specific surface area of 200 m ² / g or less. 3. The water-soluble binder is at least one selected from polyvinyl alcohol, methyl cellulose, carboxymethyl cellulose, hydroxypropyl cellulose, hydroxyethyl cellulose and hydroxymethyl cellulose.
Or the inkjet recording medium according to 2. 4. The inkjet recording on the recording medium according to any one of claims 1 to 3 using an ink containing a sublimation dye, and then heating the recording medium by superimposing the ink on the recording medium.
A transfer recording method, which comprises transferring the sublimation dye onto a print medium.