JPH05229262A - Thermal transfer recording medium for clothing - Google Patents

Abstract

PURPOSE:To eliminate the missing of a character due to reverse transfer by combining a thermal transfer sheet wherein an ink layer having a specific compsn. is provided on a support with a transfer target whose printing surface is composed of a polyamide resin having specific surface strength. CONSTITUTION:A thermal transfer sheet is produced by providing an ink layer 12 based on a colorant and a polyamide resin whose m.p. measured by a DSC method is 80-150 deg.C on a support 11 and a receiving sheet is produced by providing a layer having a printing surface based on a polyamide resin and surface strength due to JIS-P8129 of No.2 or more on a support. When both sheets are combined to perform thermal transfer, since the surface strength of the receiving sheet is enhanced, a reverse transfer phenomenon wherein the surface substance 21a of the transfer target 21 is bonded to the thermal transfer sheet to generate missing in an image can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal transfer recording medium for clothing, and more particularly, it is displayed on clothing itself and has good transferability or no character missing, and the transferred image is dry cleaning resistant. The present invention relates to a thermal transfer recording medium for clothes, which has excellent properties such as water resistance and water-washing resistance (hereinafter also referred to as “cleaning resistance”) and excellent abrasion resistance, and which can provide an image without reverse transfer.

[0002]

2. Description of the Related Art Many thermal transfer recording media for clothing have been proposed so far. In particular, when the ink layer of the thermal transfer sheet is formed on the transferred material in a pattern, the study to make the image formed on the transferred material have good cleaning resistance is energetically made. There is. At present, such a study depends on the quality of the fixing property of the binder resin, which is one of the constituent elements of the thermal transfer layer (ink layer).

For example, as the binder resin, (1) a polyamide resin and an amorphous polyester resin and / or an epoxy resin are used (Japanese Patent Laid-Open No. 61-244593), and (2) a glass transition temperature of 40 ° C. or higher. An amorphous polyester resin having an average molecular weight of 10,000 or less, preferably a glass transition temperature of 50 to 80 ° C. and a number average molecular weight of 500.
An aromatic polyester containing 0 or less bisphenol component is used (JP-A-62-13384), and (3) polymerized fatty acid-based polyamide resin is used (JP-A-62-66).
991), (4) at least one of vinyl chloride-vinyl acetate copolymer resin, acrylic-vinyl acetate copolymer resin, methacryl-vinyl acetate copolymer resin, vinyl acetate resin is used (JP-A-63- No. 56490),
(5) Butyral resin is used (Japanese Patent Laid-Open No. 63-8278).
No. 6), (6) a fatty acid amide or a fatty acid imide having a melting point of 120 ° C. or higher, and a polyamide resin or a vinyl resin having a melting point of 100 ° C. or higher (JP-A-63-1797).
No. 91).

However, an image formed by a thermal transfer ink in which a colorant is dispersed in these conventional binder resins is used as an ink component for a cleaning solvent (water, warm water, 1,1,1-).
Since substances that dissolve in trichloroethane, perchlorene, naphtha, etc.) are used, the fact is that they do not fully satisfy cleaning resistance.

In view of such circumstances, the inventors of the present invention, as a thermal transfer recording medium for clothing capable of forming a transferred image having excellent cleaning resistance, have an ink mainly composed of polyamide and a colorant having a melting point of 80 to 150 ° C. A combination of a sheet (thermal transfer sheet) and various transfer materials (Japanese Patent Application No. 3-17177), a similar ink sheet, and a printed surface made of polyamide with Beck smoothness of 500.
A thermal transfer recording medium for clothing, which is composed of a material to be transferred for more than a second, has already been proposed (Japanese Patent Application No. 2-279643).
issue).

However, these two thermal transfer recording media for clothing proposed by the present inventors are sometimes,
It has been reported that reverse transfer development occurs during image formation, and it is difficult to say that the abrasion resistance of the transferred image is sufficient, and in some cases, character omission sometimes occurs during image formation.

[0007]

SUMMARY OF THE INVENTION The present invention provides a thermal transfer recording for clothing which does not cause reverse transfer or character loss during image formation, has a cleaning resistance of the formed image, and can withstand abrasion. It provides a medium.

[0008]

The first thermal transfer recording medium for clothing of the present invention comprises a colorant and a melting point (DS) directly on a support or through a release layer (a release layer containing wax as a main component).
The thermal transfer sheet (hereinafter sometimes referred to as “thermal transfer sheet (a) or“ ink sheet (a) ”) provided with an ink layer containing a polyamide resin as a main component at 80 to 150 ° C. (according to the C method) and a printing surface are Polyamide resin is the main component, and the surface strength according to JIS P8129 is no. It is characterized in that it is used in combination with two or more transferred bodies (hereinafter sometimes referred to as “transferred body (b ₁ )”).

A second thermal transfer recording medium for clothing according to the present invention comprises:
The above-mentioned ink sheet (a) and a transferred material whose main surface is a polyamide resin and whose ten-point average roughness measured by a surface roughness meter is 20 μm or less (hereinafter referred to as “transferred material (b ₂ )” It may be called) and is used in combination.

The present invention will be described in more detail below. The first of the present invention has been particularly emphasized "that the strength of the surface of the reverse transcription development of prevention and the transfer member (b ₁₎ (hereinafter" surface strength ". Therefore, the first garment of the present invention The description will proceed from the thermal transfer recording medium.

FIG. 1 is for explaining the mechanism of occurrence of the reverse transcription phenomenon, and as can be seen from this figure,
The reverse transfer phenomenon is affected by the surface strength of the transferred material (b ₁ ). In FIG. 1, 1 is an ink sheet (a), 11 is a support of the ink sheet 1, 12 is an ink layer of the ink sheet 1, 2
Reference numeral 1 is a transferred body (b ₁ ). That is, when the surface strength is weak, the surface material 21a of the transferred material 21 is taken up on the ink sheet 1 side when the ink sheet and the transferred material 21 are peeled off after the image formation, and as a result, the image is missing. In FIG. 1, d
Indicates a portion where the above-mentioned omission occurs. Further, when the formed image is rubbed, if the surface strength is weak, the transfer-target surface material is likely to be detached.

In order to solve these problems, a material to be transferred 21 having a strong surface strength, specifically, JIS
P8129 “Paper surface strength test method using wax”
The surface strength is no. It is necessary to use those that are 2 or more. The outline of this recording method is as shown in FIG. In the figure, 3 is Denison wax, and No. 2 to No. It means that the frictional force increases from small to large as moving to 32.

As mentioned above, the thermal transfer sheet (a) for clothing of the present invention has a thermal transfer ink layer formed on a support, either directly or via a release layer.

The support is a plastic film having a thickness of about 3 to 10 μm, and examples thereof include a polyester film, a polycarbonate film, a polyimide film, a wholly aromatic polyamide film, a polyether ether ketone film and a polysulfone film.

The adhesion amount of the thermal transfer ink layer is 0.1 to 3.0.
g / m ^2, preferably made from those about 0.5 to 2.0 g / m ^2, and is formed mainly of a colorant and a melting point of 80 to 150 ° C. of the polyamide resin.

The colorant is preferably one that is not attacked by the cleaning solvent, and carbon black, other inorganic pigments; organic dyes and pigments are used. Of these, carbon black is particularly preferable.

The polyamide resin used for the ink layer has a melting point (by the DSC method) of 80 to 150 ° C. (the melting point here is the main melting peak temperature when a differential calorimeter (DSC) is used). Use one. Examples of such a material include a polyamide copolymer and a modified polyamide resin. Since these are practically soluble in lower aliphatic alcohols such as methanol, ethanol and IPA (insoluble in cleaning solvents), they are very easy to handle.

Examples of such a polyamide resin include the following. (2) Ternary copolymer No. 3) (6/66/610 nylon) (mp.
128 ℃) No.4) (6/66/610 Nylon) (mp.
140 ℃) No.5) (6/66/12 Nylon) (mp.
119 ° C) No.6) (6/66/12 Nylon) (mp.
123 ° C) No.7) (6/610/12 Nylon) (mp.
110 ℃) No.8) (6/610/12 Nylon) (mp.
98 ° C) No. 9) (6/66/11 Nylon) (mp.
(120 ° C) (3) Quaternary copolymer No. 10) (6/66/610/12 nylon)
(Mp. 85 ℃) No. 11) (6/66/610/12 Nylon)
(Mp 90 ° C.) Of these copolymers, in order to lower the melting point and lower the melt viscosity, the more the copolymerization component is, the better, but if the crystallization is lowered too much, the material becomes sticky. Therefore, it is practically easy to handle a terpolymer.

The ratio of colorant / binder resin is 20 / by weight.
80-90 / 10, preferably 30 / 70-70 / 30
Is. When the ratio of the colorant is larger than this range, the ink layer is likely to come off from the support, or the formed image has insufficient abrasion resistance. On the contrary, if the ratio of the colorant is smaller than this, the thermal transfer property of the ink layer is insufficient.

In addition, if necessary, other substances (for example, resin, wax, surfactant, etc.) may be added to the ink layer for the purpose of improving sensitivity, preventing the ink layer from falling off the support, and improving dispersibility. It can be added, but should be in a minimum amount so as not to reduce cleaning resistance. The ink layer material is used by dissolving or dispersing it in an appropriate solvent other than the cleaning solvent, or by melting and dispersing it.

The peeling layer, which is provided between the support and the ink layer as needed, improves the peelability between the support and the ink layer (including the island-shaped ink) during printing, and is heated by a thermal head. After that, it may be heat-melted into a low-viscosity liquid, and the layer may be easily cut near the interface between the heated portion and the non-heated portion. Therefore, a wax-like substance that is hard at room temperature and melts when heated is preferably used as the main component of the release layer.

Examples of such wax-like substances include natural waxes such as beeswax, carnauba wax, spermaceti wax, wood wax, candelilla wax, rice bran wax, and montan wax: paraffin wax, microcrystalline wax, oxidized wax, Synthetic waxes such as ozokerite, ceresin, ester wax, and polyethylene wax are preferably used, and higher fatty acids such as margaric acid, lauric acid, myristic acid, palmitic acid, stearic acid, furoic acid, and behenic acid: stearyl alcohol, behenyl alcohol, etc. Higher alcohols: esters such as fatty acid esters of sorbitan: amides such as stearamide and oleinamide. In addition, rubbers such as isoprene rubber, butadiene rubber, ethylene propylene rubber, butyl rubber, and nitrile rubber may be added in order to improve abrasion resistance, and / or the release layer is provided with adhesiveness (of the release layer). To prevent falling off)
Therefore, resins such as ethylene-vinyl acetate copolymer and ethylene-ethyl acrylate copolymer may be added. The amount of the peeling layer deposited is 0.1 to 5 g / m ^2, preferably 0.1.
It is 5 to 2.0 g / m ² .

As the transferred material (b ₁ ) used in combination with the ink sheet (a), the printed surface is mainly composed of polyamide resin and the surface strength according to JIS P8129 is no. It is 2 or more. As such a material to be transferred (b ₁ ), a material such as a nylon film, a nylon cloth, a nylon non-woven cloth which itself is made of polyamide, or a support (paper, film, cloth, etc.) containing polyamide as a main component is used. One having a receptive layer is provided.

As the support here, paper is preferably water-resistant treated with resin or the like, synthetic paper or the like. Regarding the cloth, artificial fibers such as rayon, bemberg, acetate, nylon, polyester, natural fibers such as cotton and silk, or mixed fibers thereof, and non-woven fabrics thereof can be used. As the film, a nylon film, a polyester film, a polyolefin film, an acetate film, a polycarbonate film, a polyimide film or the like can be used.

The phenomenon that the surface strength is lowered tends to occur particularly when a coating layer is provided. However, it is often unavoidable to provide a coating layer in order to improve the surface smoothness and the fixing property. Therefore, as means for improving the surface strength, (i) an adhesive layer is provided between the support and the receiving layer, and (ii) in paper and cloth, the receiving layer component is well impregnated into the inside of the supporting body. It is advantageous to do so.

On the other hand, the second aspect of the present invention particularly emphasizes the prevention of character omission and the surface roughness of the transferred material (b ₂ ).
The surface roughness here means the degree of ten-point average roughness in FIG. The second thermal transfer recording medium for clothing of the present invention is the above-mentioned ink sheet (a), the printed surface is mainly composed of a polyamide resin, and the ten-point average roughness measured by a surface roughness meter is 20 μm or less. It consists of a combination with the body (b ₂ ). In addition, in FIG. 3, ten-point average roughness Rtm
(Rz.D) is represented by Rtm = (Z ₁ + Z ₂ + Z ₃ + Z ₄ + Z ₅ ) / 5. That is, a portion of the measurement length L was extracted from the roughness curve in the direction of the center line, the measurement length L was divided into 5 equal parts, and the maximum height (Z) of each of the 5 divided parts was averaged. It is a value, and the surface roughness measurement conditions are as follows. X × Y = 3 mm × 2 mm or more Stylus shape: 2 μm R 90 ° conical diamond measuring force 0.7 mN (0.07 gf) Obtain the 10-point average roughness about the X axis that touches the maximum in the Y direction

The transferred material (b ₂ ) is substantially the same as the transferred material (b ₁ ) described above, but the ten-point average roughness measured by a surface roughness meter is 20 μm or less. The conditions must be met.

[0028]

EXAMPLES Next, the present invention will be described more specifically with reference to Examples and Comparative Examples. The parts here are based on weight.

Examples 1 to 7 and Comparative Example 1 Carbon black 50 parts 6/66/12 Nylon (mp 120 ° C.) 50 parts Methanol 900 parts An ink layer forming liquid having a composition of about 1 g / dry weight m
² was provided on a support polyester film having a thickness of about 4.5 μm to prepare a thermal transfer recording sheet for clothes (ink sheet 1). On the other hand, a release layer forming liquid having a composition of 9 parts of paraffin wax, 1 part of ethylene-vinyl acetate copolymer resin, and 90 parts of toluene was prepared and the above ink sheet 1 was prepared so that the dry adhesion amount was about 1 g / m ^2. A thermal transfer recording sheet for clothing (ink sheet 2) was prepared by providing the sheet between the support and the ink layer. The following composition liquid is applied to the film surface of the ink sheet 1 and the ink sheet 2 on the side opposite to the side on which the ink layer is provided and dried to a thickness of about 0.1.
A μm stick prevention layer was provided. Silicone rubber (30%) 10 parts Toluene 70 parts Hardener 0.1 parts

Then, the transfer materials shown in Table 1 were prepared.

A combination of these ink sheets 1 or 2 and the transferred material is printed by a thermal transfer printer (line type head, applied energy is 10 to 25 mj / mm ² ), the applied energy (sensitivity) is determined, and the characters are removed. At the same time, the transferred images were obtained and the following tests were conducted. Water washing test JISL-0844A-3 Dry cleaning test JISL-0860 (However, the solvent was 1,1,1-trichloroethane and the temperature was 25 ° C.) Friction test JIS L-0849 (II type, wet state) The results are summarized in Table 1.

[Table 1] (Ink sheet 1 / Ink sheet 2) Note 1) Note 2) Note 3) ○: Image does not fall off △: Image falls off a little ×: Image falls off completely

Examples 8 to 13 and Comparative Examples 2 to 4 The transferred materials shown in Table 2 were prepared. These transferred bodies and the ink sheets 1 or 2 prepared in Examples 1 to 7 are combined and printed by a thermal transfer printer (line type head, applied energy 10 to 25 mj / mm ² ) to obtain applied energy (sensitivity). The obtained characters were evaluated for missing characters, and at the same time, transferred images were obtained and the following tests were conducted. Water washing test JISL-0844A-3 Dry cleaning test JISL-0860 (however, the solvent was 1,1,1-trichloroethane and the temperature was 25 ° C.) Character loss rank (visual judgment) It shows in Table 2.

[Table 2] (Ink sheet 1 / Ink sheet 2) Note 1) and Note 2) are the same as Table 1. Note 4) Measured with a surfcom surface roughness meter manufactured by Tokyo Seimitsu Co., Ltd. Measurement conditions X direction 3 mm Y direction 2 mm The ten-point average roughness was measured on the X axis which was touched the maximum in the Y direction. Note 5) Character loss rank 1: Many characters are not legible
2: There are many missing characters 3: There is missing characters 4. Some characters are missing 5: No characters are missing

[0035]

【The invention's effect】

(1) According to the invention of claim 1, a polyamide resin having a melting point suitable for thermal transfer recording and strong against a cleaning solvent is used as a binder for the ink layer, so that a practical image having excellent washing resistance can be obtained. Be done. In addition, JIS P
The surface strength of No. 8129 is No. By using in combination with two or more transferees, it is possible to obtain an image which is free from characters due to reverse transfer and has excellent abrasion resistance. Furthermore, by providing a release layer between the support of the ink sheet and the ink layer, the releasability of the ink layer is improved, sensitivity is improved, and reverse transfer is prevented. (2) According to the second aspect of the present invention, the contact between the ink tote and the transfer-receiving member is good, and an image without missing characters can be obtained. In addition, the same effect as the above (1) is obtained.

[Brief description of drawings]

FIG. 1 is a diagram illustrating that a reverse transfer phenomenon occurs between a transfer target and an ink sheet.

FIG. 2 is a diagram showing a surface strength measuring method according to JIS P8129.

FIG. 3 is a diagram for explaining a method of calculating a ten-point average roughness.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ink sheet 11 Ink sheet support 12 Ink sheet ink layer 21 Transfer target

Claims (2)

[Claims] 1. A thermal transfer recording medium for clothing, characterized by comprising the following thermal transfer sheet (a) and a transfer target (b ₁ ) in combination. (A) A colorant and a melting point (by the DSC method) 80 directly on the support or via a release layer containing wax as a main component.
A thermal transfer sheet provided with an ink layer containing a polyamide resin as a main component at 150 ° C. (B ₁ ) The printed surface contains polyamide resin as a main component, and the surface strength according to JIS P8129 is No.
The transferred material which is 2 or more. 2. A thermal transfer recording medium for clothing, comprising the following thermal transfer sheet (a) and a transfer target (b ₂ ) in combination. (A) A colorant and a melting point (by the DSC method) 80 directly on the support or via a release layer containing wax as a main component.
A thermal transfer sheet provided with an ink layer containing a polyamide resin as a main component at 150 ° C. (B ₂ ) A transferred material whose printed surface contains a polyamide resin as a main component and has a ten-point average roughness of 20 μm or less as measured by a surface roughness meter.