JPH04187493A - Thermal transfer recording medium for clothing label - Google Patents

Abstract

PURPOSE:To form a transfer image having dry-cleaning resistance and resistance to washing by water by a method wherein each resin in use is a thermoplastic resin, the melting or softening point of the resin of an ink sheet is 80-150 deg.C, and that of an accepting layer is 150-260 deg.C. CONSTITUTION:In a thermal transfer sheet for clothing, a thermal transfer ink layer is provided on a substrate directly, or through an undercoat layer and a release layer formed thereon. As the substrate, a plastic film of the order of 3-10mum thickness, such as polyester film and polycarbonate film, can be used. On the other hand, as a material to which ink is to be transferred, a material provided with an accepting layer mainly composed of a specific substance insoluble in a cleaning solvent on a substrate is used. A polyamide resin can provide high resistance to cleaning solvent and ironing and produce a good effect on thermal transfer properties. In this manner, the ink layer of the ink sheet is compatibly fused and mixed with the accepting layer of the transfer material, resulting in an obtained image being improved in resistance to cleaning and ironing.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a thermal transfer recording medium for clothing labels, and more specifically, it is used to display on clothing care labels or clothing itself, and has good transferability and , a thermal transfer notebook for clothing (i/ The present invention relates to a thermal transfer recording medium for clothing labels consisting of a combination of a transfer material having a transfer sheet and a receptor layer.

[Conventional technology]

Many heat transfer notes for clothing labels have been proposed so far. In particular, when the ink layer of a thermal transfer notebook is formed on a transfer object in the form of a pattern, efforts have been made to ensure that the image formed on the transfer object exhibits good cleaning resistance. There is. The reality is that the expression of such effects depends on the fixing properties of the binder resin, which is one of the constituent elements of the thermal transfer layer.

For example, as the binder resin, (1) polyamide resin and amorphous polyester resin and/or epoxy resin are used (JP-A-61-244593), (2) the glass transition temperature is 40°C or higher and the number average molecular weight is 10. .000 or less amorphous polyester resin, preferably.

(3) Use of an aromatic polyester containing a hisphenol component with a glass transition temperature of 50-80°C and a number average molecular number of 5000 or less (Japanese Patent Application Laid-Open No. 13384/1984); 62-669
91 Publication), (4) Hinyl chloride-vinyl acetate copolymer resin, acrylic-vinyl acetate copolymer resin, methacrylic-vinyl acetate copolymer resin At least one vinyl acetate resin is used (JP-A-63-56490) ), (5)
(6) containing a fatty acid amide or fatty acid imide with a melting point of 1206C1u and a polyamide resin or vinyl resin with a melting point of 100°C or higher (Japanese Patent Application Laid-Open No. 63-1797).
Publication No. 91).

However, images formed on a transfer object using thermal transfer inks containing colorants dispersed in these binder resins are dissolved in cleaning solvents (water, warm water, l, Ll-, dichloroethane, perchloroethane, naphtha, etc.) as ink components. The reality is that the cleaning resistance is not fully satisfied because the cleaning agent uses a substance that is

On the other hand, the # used in the receiving layer of the transfer target is -i
The reality is that most of them have low melting points and are easily attacked by cleaning solvents, so they have poor ironing resistance and cleaning resistance.

[Problem to be solved by the invention]

The present invention was developed in view of these circumstances, and is a thermal transfer sheet for clothing that not only has good transferability from the ink sheet to the object to be transferred, but also can form a transferred image that is resistant to dry cleaning and water washing. , and a thermal transfer recording medium for clothing comprising a combination of the thermal transfer sheet and an object to be transferred.

[Failure to solve the problem]

The present invention combines an ink sheet formed by providing an ink layer mainly composed of a colorant and a resin binder on a support, and a transfer material having a receiving layer mainly composed of resin on the support. In the thermal transfer recording medium for clothing labels used in the thermal transfer recording medium for clothing labels, each of the resins mentioned above is a thermoplastic resin, and the melting point or softening temperature of the Inkun-1 resin is 110 to 150°C;
The #IR resin of the receptor layer is characterized by having a temperature of 15(] to 260°C.

The present inventors have been conducting research to solve the above-mentioned problems, and have found that it is effective to specify the resin of the ink layer in the ink sheet and the receptor layer of the transfer target. The present invention has been made based on this.

The present invention will be explained in more detail below.

First, in the thermal transfer sheet for clothing according to the present invention, a thermal transfer ink layer is formed on a support directly, via a release layer, or via an under-to 8 layer and a release layer provided thereon. It is something that

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

The adhesion amount of the thermal transfer ink layer is 0.1-3.0g/rr? Preferably 0.5-2.0g/n? <It is made of life products and is formed mainly from a coloring agent and a binder that does not dissolve in cleaning solvents.

The coloring agent is preferably one that is not affected by the cleaning solvent, and carbon blanks, other inorganic pigments, organic dyes and pigments, etc. are used. Among these, carphone black is particularly preferred.

The binder in the ink layer has a melting point (based on fDSC method) or a softening point (based on VICAT method) of 80 to 150.
A thermoplastic resin having a temperature of 0.degree. C. is used. Such resins include polyhinyl butyral and polyvinyl chloride.

Polyhynylidene chloride, hnylidene chloride acrylonitrile copolymer resin, fluororesin, polyamide, polyethine, polypropylene, polyester.

Examples include NBR, ethylene-vinyl acetate copolymer resins, and among them, polyamide resins are excellent in cleaning solvent resistance, thermal transferability, and ironing resistance. Melting point (
As a polyamide resin having a softening point (based on the DSC method) or a softening point (based on the VICAT method) of 80 to 150°C.

For example, there are the following.

(1) Binary copolymer (2) Ternary copolymer (6/66/610 nylon) (mP 15
0℃) (6/66/+2 nylon) (ml
l 120℃) (6/610/+2 nylon)
(mp 100℃) The ratio of colorant/binder is 30/70 to 70/30 by weight, preferably 40/60-6
It is 0/40. If the ratio of the colorant is larger than this, the ink layer may easily fall off from the support, or the abrasion resistance of the formed image may become insufficient. On the other hand, if the ratio of the colorant is smaller than this, the cohesive force of the ink layer becomes large, and a phenomenon (for example, a phenomenon in which the center part of the character "no" is dragged by the surrounding parts) occurs.

In addition, other substances (e.g., resins, waxes, surfactants, etc.) may be added to the ink layer as necessary for the purpose of improving sensitivity, preventing the ink layer from falling off the support, improving dispersibility, etc. However, the amount should be kept to a minimum so as not to reduce cleaning resistance.

The ink layer material is used by being dispersed in a suitable solvent other than the cleaning solvent, or by being melted and dispersed.

A release layer provided as necessary between the support and the ink layer separates the support and the ink layer (including island-like ink) during printing.
It may be configured so that after being heated by a thermal head, it is thermally melted to become a low viscosity liquid and the layer is easily cut near the interface between the heated part and the non-heated part.

Therefore, as the main component of the release layer, a wax-like substance that is hard at room temperature and melts when heated is preferably used.

Such wax-like substances include, for example, beeswax,
Natural waxes such as carnauba wax, spermaceti wax, wood wax, candelilla wax, rice bran wax, and montan wax, and synthetic waxes such as paraffin wax, microcrystalline wax, oxidized wax, osikelite, ceresin, ester wax, and polyethylene wax are preferably used. In addition, higher fatty acids such as margaric acid, lauric acid, myristic acid, palmitic acid, stearic acid, fromenic acid, and hehenic acid; higher alcohols such as stearyl alcohol and behenyl alcohol; and esters such as fatty acid esters of solhitan; stearamide and oleinamide. Amides such as In addition, rubbers such as isoprene rubber, butadiene rubber, ethylene propylene rubber, 5-butyroom, nitrile rubber, etc. may be added to give the release layer elasticity (improve the adhesion between the ink sheet and the transfer target). and/or resins such as ethylene-vinyl acetate copolymer and ethylene-ethyl acrylate copolymer may be added in order to impart adhesiveness to the release layer (to prevent the release layer from falling off).

The adhesion amount of the release layer is 0.5 to 8 g/rr? Preferably it is l-5g/-.

In addition, if necessary, the undercoat layer provided between the support and the release layer may have an uneven surface to increase the surface area compared to a smooth one, thereby improving the adhesion between the undercoat layer and the release layer. It is effective in increasing the area and improving the adhesive force between these two layers, and at the same time making the release layer easier to tear during thermal transfer.

Such an uneven shape can be obtained by binding fine powder of metal oxide with a binder.

Examples of the material for the metal oxide fine particles include silica, aluminum oxide, titanium oxide, zinc oxide, etc., and the particle size thereof is preferably about O, I-3. As the binder, a vinyl chloride acetic acid copolymer, a thermoplastic resin such as ethyl cellulose, an unsaturated polyester resin, a thermosetting resin such as an epoxy resin, etc. can be used. The ratio (weight ratio) of these metal oxide fine particles to the binder is preferably 1:10 to 5:1.

The amount of the under layer deposited is O,I-3,0 g/m, preferably 0.5 to 2.0 g/m.

On the other hand, the material to be transferred includes a support provided with a receiving layer mainly composed of a specific substance that does not dissolve in the cleaning solvent.

The resin used for the receptor layer has a melting point (by DSC method) or a softening point (by Hikanoto method) of 150 to 250°C.
A thermoplastic resin is used. Such resins include polyhinyl butyral, polyvinyl chloride, polyvinylidene chloride, hnylidene chloride acrylonitrile copolymer resin, fluororesin, polyamide, polyethylene,
Examples include polypropylene, polyester, NBR, ethylene-vinyl acetate copolymer resin, polyacrylonitrile, polyurethane, and hinyl chloride-vinyl acetate copolymer resin, among which polyamide resin has good cleaning solvent resistance and ironing resistance. It also has a good effect on thermal transferability. Polyamide resins having a melting point or softening point of 150 to 260°C include those shown below, and nylon 6, nylon 66, nylon 610, and the like can also be suitably used.

In addition to these substances, the receiving layer may contain a white pigment such as titanium oxide, silica, alumina, or zinc oxide in order to improve the whiteness or thermal transferability of the transferred object. Furthermore, a plasticizer may be added to impart flexibility. The receiving layer material is used by being dissolved or dispersed in a suitable solvent, or by being melted and dispersed.

The amount of adhesion of the receptor layer is l-30g/lo', preferably 3~
It is about 20g/d. (The amount of adhesion here refers to the amount of adhesion on the surface, and does not include the amount impregnated into the support or the amount adhered to the back side.) For the support of the transfer object, a film, cloth, etc. can be used. As for paper, it is preferable to use water-resistant paper treated with resin or the like, synthetic paper, or the like. As for the cloth, artificial fibers such as rayon, benvelub, aptate, nylon, and polyester, natural fibers such as cotton and silk, blended fibers thereof, and nonwoven fabrics thereof can be used. As for the film, polyester film, polyolefin film, polycarbonate film, polyimide film, polyamide film, etc. can be used.

According to the thermal transfer medium for clothing labels of the present invention, the melting point or softening point of the resin (binder) of the ink layer is 110-15.
By setting the temperature to 0° C., thermal transferability can be improved. In addition, by setting the melting point of the receiving layer to 150 to 260°C, the resin of the ink layer and the resin of the receiving layer are well integrated by heat when heat is applied, resulting in an image with good fixability, and iron resistance. (Icons are often heated at about 150°C, but the resin used for the receptor layer and ink layer of the present invention has a very high melt viscosity, so even if the image or receptor layer melts, the resin will not melt.) There is no leakage and the image is not disturbed, so there is virtually no problem.

Further, in order to achieve good integration of the ink layer and the receptor layer, it is effective to use the same type of resin.

〔Example〕

Parts here are by weight.

Examples 1 to 3 and Comparative Examples 1 to 3 The following five types of ink layer composition liquids were prepared, each coated on a polyester film (support) having a thickness of about 4.5 μm, and dried to give about Ig. An ink layer of /m was formed.

[Ink sheet 1] Carbon blank 50 copies 6/6
6/+2 nylon (m, p, 120°C) 50 parts Methanol 900 parts [Ink sheet 2] Carbon black 50 parts Toluene 900 parts [Ink sheet 3] Carbon black 50 parts Hynylidene fluoride (softening point 90°C) 50 parts Methyl ethyl ketone [ink sheet 4] carbon black 50 parts acrylic resin (m.9.7 parts °C) 50 parts methyl ethyl ketone 900 parts [ink sheet 5] carbon black 50 parts styrene resin m. p. 73℃) 50 parts toluene
900 parts of silicone rubber (30% toluene solution) lOff toluene 90 parts curing agent (C
AT-PL-8) 0. Apply a composition liquid consisting of 1 part. Five types of ink sheets were prepared by providing an anti-stick layer with a thickness of about 0.1 μm.

On the other hand, the following receptor layer composition liquid was applied to the surface of a nylon base fabric using a wire bar, washed with water, and dried to provide a receptor layer with a thickness of about 20 μm to prepare a transfer object.

[Transferred object 1] Nylon 6 (m.p. 215°C>
2.4fl calcium chloride
1.6 parts methanol 16
In addition, a receiving layer 2 was prepared by applying the following receptor layer composition liquid onto the surface of a nylon base fabric using a wire bar and drying to form a receptor layer having a thickness of about 20 μm.

[Transfer object 2] Urethane resin (m.p. 160°C) 20 parts Methyl ethyl ketone 80 parts Furthermore, the following receptor layer composition liquid was applied to the surface of the nylon base fabric with a wire bar and dried to form a receptor layer with a thickness of about 20 μm. Transfer target 2 was created by providing layers. .

[Transfer object 3] Thermosetting resin (acrylic resin) 20 parts Curing agent (isocyanate) 6 parts Toluene/butyl acetate (85/+5) mixed solvent 74 parts Commercially available thermal transfer using these ink sheets and transfer object Printing was performed using a printer (manufactured by Ricoh Co., Ltd., line type, head applied energy 10 to 25 mi/mm2) to determine the appropriate printing energy (sensitivity), and a transferred image was created, and the following tests were conducted. The results are shown in Table-1.

・Water wash resistance test: JIS L-0844 A-3 ・Dry cleaning resistance test JIS L-0860 (However, the solvent was I, 1, ]- ]1-lichloroethane and the temperature was 25°C.) 0. Image does not fall off at all 0 Image hardly falls off △: Page image falls off slightly × Image falls off completely ・Iron resistance test: 15 g/cn of image area with an iron set at 150°C! The image was rubbed back and forth with force 10 times, and the image disturbance was visually judged. 1. No evidence of image C. Almost no image disturbance. 6. Slight disturbance of the image. According to the invention, the ink layer of the ink sheet and the receiving layer of the transfer object are well mixed, and an image with good cleaning resistance and ironing resistance can be obtained. .

Patent applicant Rico Co., Ltd.

Claims (2)

[Claims] (1) Combining an ink sheet formed by providing an ink layer mainly composed of a colorant and a resin binder on a support, and a transfer object having a receiving layer mainly composed of resin on the support. In the thermal transfer recording medium for clothing labels used, each of the resins mentioned above is a thermoplastic resin, and the melting point or softening point is 80 to 150°C for the ink sheet and 150 to 260°C for the receiving layer. A thermal transfer recording medium for clothing labels characterized by: (2) The thermal transfer recording medium for clothing labels according to claim 1, wherein the resin is polyamide.