JPH03176197A - Color thermal transfer recording medium - Google Patents

Abstract

PURPOSE:To obtain a color printing picture having excellent transfer properties and abrasion resistance by specifying the viscosity of a peel ply while a thermoplastic resin incompatible to peel-ply ink is contained in the binder of a colored layer. CONSTITUTION:A colorless or extremely light-colored heat fusing ink layer (a peel ply) is formed onto a base material, and each-color heat fusing ink layer (colored layers) of the three colors of at least yellow, magenta and cyan are successively formed repeatedly along the longitudinal direction of the ink layer on the ink layer. Viscosity at 120 deg.C of the colorless or extremely light-colored heat fusing ink layer is 1000CPS or lower, and one kind or more of 10-80 wt. % thermoplastic resins completely incom patible to the colorless or extremely light-colored heat fusing ink layer are contained in binder components constituting each-color heat fusing ink layer. Solid waxes and the thermoplastic resin are used as main components forming the peel ply, and the thermoplastic resin abounding in compatibility with waxes and having the melting point of 50-150 deg.C is cited as the thermoplastic resin. Solid waxes and the thermoplastic resin completely incompatible to solid waxes and having the melting point of 50-150 deg.C is employed as a main component forming the colored layer besides a coloring mate rial.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a novel color thermal transfer recording medium suitable for thermal transfer printers capable of color printing.

[Prior art] In recent years, color print recording methods have ranged from the conventional dot impact method using fabric ribbons to electrostatic recording methods, ink jet methods, thermal transfer recording methods, electrical thermal transfer recording methods, sublimation heat-sensitive recording methods, etc. A wide range of methods have been devised, including non-impact methods.

In particular, among non-impact methods, thermal transfer recording methods have made remarkable progress due to their advantages such as maintenance-free, high printing quality, high-speed and quiet operation, tamper resistance, and the ability to reduce the weight and size of the machine body. The printing medium used in the thermal transfer recording method consists of heat-melting ink layers of yellow, magenta, and cyan (black if necessary) on a base material, which are sequentially reversed by <-9 along its length. The inks of each color were sequentially transferred and superimposed onto the recording paper by heating from the back side of the substrate using a thermal device, and a color printed image was obtained. However, the color printed image obtained by this printing medium has very poor abrasion resistance because the color-containing ink layer is a homogeneous and compatible component system with a wax substance as the main component, and the printed image is very poor. Just by lightly rubbing it with your fingers or the like, it becomes smudged or scraped, and the preservation of the printed image is not always completely satisfactory.

[Problems to be Solved by the Invention] An object of the present invention is to improve the abrasion resistance of the color print images output in the above-mentioned prior art, thereby providing a thermal transfer recording that provides color print images with better storage stability. The goal is to provide a medium.

[Means for Solving the Problems] In the present invention, a colorless or extremely light-colored hot-melt ink layer (hereinafter referred to as a release layer) is provided on a base material, and at least yellow, micro, and cyan ink layers are provided on the base material. Heat-melt ink layers (hereinafter referred to as colored layers) of each color (hereinafter referred to as colored layer) of three colors (four colors with black added as necessary) are formed repeatedly along the length direction, and the 11 female layers are heated at 120°C. viscosity of 1000
By setting the CPS or less, and by containing at least one type of thermoplastic resin and 10 to 80% by weight of at least 11 thermoplastic resins that are not completely compatible with the delamination ink in the colored layer, the transferability is improved. It is possible to obtain color printed images with excellent wear resistance and abrasion resistance.

,) II Lifu's viscosity at 120℃ is 1000CPS
If the peeling layer exceeds 20% or there is no peeling layer itself, the transferability will be significantly deteriorated. Most preferably it is 200 CPS or less.

Furthermore, if the binder component of the colored layer does not contain a thermoplastic resin that is not completely compatible with the release layer, the colored layer will be completely mixed with the release layer, resulting in extremely poor friction resistance. Therefore, even if the thermoplastic resin is 10% by weight, it has little effect on the abrasion resistance of the printed image, and 80% by weight
If it exceeds this, the transferability will deteriorate significantly. Most preferably it is 20-50% by weight.

The base material in the present invention includes plastic films such as polyester and polycarbonate, capacitor paper,
Thin paper such as glassine paper is available, and if necessary, the surface in contact with the surf rod may be subjected to heat-resistant slipping treatment for the purpose of preventing sticking and/or king (fusion).

The main components forming the release layer according to the present invention include solid waxes and thermoplastic resins that are normally used in hot-melt inks, and examples of the waxes include carnauba wax, montan wax, candelilla wax, and microcrystalline wax. Solid waxes with a melting point of 50 to 120° C., such as oxidized wax, Estherwa Nox, and Baraffin Wax, are deposited, and the thermoplastic waxes mentioned above are used. ! ! ! ff+
Examples of fats include water I5 petroleum cake resin petroleum rosin resin, aromatic petroleum resin low molecular weight polyethylene, ethylene-vinyl acetate source 4 tree 2 above q, kusuden n phase rich compound) (50-150 Examples include those at ℃.

In addition, the main components forming the colored layer include colorants such as organic pigments and organic dyes of each color, as well as solid waxes and thermoplastic resins that are not completely compatible with the waxes.
The solid waxes are the same as the solid waxes in the release layer, and the thermoplastic resins include polyamide-based It resins, polyester-based resins, acrylic acid-based resins, cellulose-based resins, vinyl-based resins, etc. Examples include thermoplastic resins having a melting point of 50 to 150°C that are not completely compatible with the solid waxes.

Next, the present invention will be explained by giving examples.

Example 1 [Release layer ink] (180CPS/200°C)
Carnauba wax 20 Parts by weight Paraffin wax 60 Ethylene vinegar and copolymerization fat 20 Total 100 [Colored layer ink] Yellow, magenta, cyan Parts by weight Organic pigment dispersant for each color Carnauba wax Microcrystalline wax Acrylic acid-based brightener 0 0 8 0 Subtotal 00 First Release Layer Ink] were melt-mixed using a hot roll.

Next, yellow, magenta, and cyan [colored layer inks] were uniformly crushed and dispersed for 2 hours using an attritor to adjust the ink.

Next, the [Release layer ink] procured in Example 1 above was applied by hot melt coating onto the Bossester film of 6/(m so that the ink layer thickness was 2 It m, and then the [Colored layer ink] ] was coated and dried by solvent-type gravure coating so that each color of yellow, magenta, and cyan was sequentially repeated along the length to an ink layer thickness of 1 and 5/7 m, respectively.

Example 2 [Release layer ink] Carnauba wax oxidized wax Aromatic petroleum resin (370 CPS/120°C) 0 0 5 parts by weight [Colored layer ink] Yellow, magenta, cyan organic pigment dispersant Candelilla wax polyamide system Tit fat Vinyl sugar 0 7 0 0 Subtotal parts by weight 00 Isopropyl alcohol 50 After preparing the ink using the same method as in Example 1, two release layers were placed on a 4 μm polyester film whose back surface had been treated with heat-resistant slipping. .571 m thick colored layer was provided 1 μm thick.

Comparative Example 1 Organic pigment dispersant for yellow, magenta, and cyan colors Carnauba wax Oxidized wax Paraffin wax 0 5 2 5 After thoroughly melting and dispersing the above ink using a hot roll, it was coated on a 6 μm polyester film by hot melt type flexogravure coating. Yellow, magenta, and cyan ink layers were sequentially applied repeatedly along the length so that each layer had a thickness of 371 m.

Comparative Example 2 Only the colored layer ink of Example 2 was coated on a 4 It m polyester film with a heat-resistant lubricity treatment on the back surface by solvent-type gravure coating so that the ink layer thickness for each color of yellow magenta and cyan was 3 mm and 1 m. It was applied repeatedly in the same direction.

Next, using the color thermal transfer recording media obtained in Example 1.2 and Comparative Example 1.2 and a color thermal transfer printer under the same conditions, the transfer properties and abrasion resistance of the printed images were observed.

(Results) As described above, by using the color thermal transfer recording medium according to the present invention, a printed image with extremely high transferability and abrasion resistance can be obtained.

[Brief explanation of drawings]

The following figure is a schematic cross-sectional view showing an embodiment of the color thermal transfer recording medium of the present invention. ■Ink film ■Base material ■Release layer ■Colored layer ■Heat-resistant slip layer

Claims (1)

[Scope of Claims] 1. A colorless or very light-colored heat-melt ink layer is provided on the base material, and furthermore, at least three color heat-melt ink layers of yellow, magenta, and cyan are provided on the base material, and the length thereof is A color thermal transfer recording medium characterized by being formed repeatedly in a direction. 2. 120℃ of colorless or very light-colored hot-melt ink layer
2. The color thermal transfer recording medium according to claim 1, wherein the color thermal transfer recording medium has a viscosity of 1000 CPS or less. 3. Among the binder components constituting the yellow, magenta, and cyan color heat-melt ink layers, at least one thermoplastic resin that is not completely compatible with the colorless or extremely light-colored heat-melt ink layer. The color thermal transfer recording medium according to claim 1, characterized in that the color thermal transfer recording medium contains 10 to 80% by weight.