JPS59136292A - Multi-color type heat transfer recording paper - Google Patents

Abstract

PURPOSE:To obtain a multi-color type heat transfer recording paper capable of giving multi-color transferred pictures only by controlling the temperature of a thermal head by using the emulsions of heat-meltable inks of different melting points. CONSTITUTION:The emulsions or aqueous dispersions of heat-meltable inks of Magenta, cyanine and yellow colors are coated on a thin glassine paper by using a Maya bar. The coated paper is treated by a super calender for compression to obtain a multi-color heat transfer recording paper having a smooth surface. An usual paper is lapped on the coated surface of the recording paper and an energy is applied correspondingly to the melting points of each ink of Magenta, cyanine and yellow colors to provide a multi-color heat transfer recording of clear corresponding color network points on the usual paper.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multicolor thermal transfer recording paper. More specifically, the present invention relates to a multicolor thermal transfer recording paper using heat-melting ink golds having different melting points as emulsions w7.

In recent years, thermal transfer recording methods, which have advantages such as post-recording stability, tamperability, and high solvent resistance, have been put into practical use compared to thermal recording methods using thermal recording devices such as thermal printers and thermal facsimiles. There is. This is called thermal transfer recording paper, and it has a heat-melting ink layer on a support.The ink layer side is overlapped with plain paper, and heat from the thermal head of a thermal facsimile machine transfers the thermal transfer recording paper to the plain paper. Recording is performed by transferring ink to.

Single-color thermal transfer, such as black, has already been put into practical use. Furthermore, research has progressed from single-color thermal transfer to multi-color transfer, and various publications can be found. For example, in Japanese Patent Application Laid-Open No. 57-182488, a thermal transfer ink layer coated on a base paper is each ink layer of eight primary colors of red, blue P, and yellow, and a black color corresponding to each set of ink layers of eight primary colors. There are some that are formed with an ink layer. Japanese Patent Publication No. 57-1824
In Japanese Patent No. 89, a set of ink layers of a plurality of different colors is formed, and the area occupied by each ink layer in the first half of the set is set in proportion to the frequency of use.

Furthermore, Japanese Patent Application Laid-Open No. 57-182490 discloses a method in which a plurality of ink layers of different colors are arranged along the sub-scanning direction.

However, when performing transfer recording, these examples not only complicate the recording system and transport system of the apparatus because they match the color to be transferred to the corresponding color portion of the thermal transfer recording paper. , has the disadvantage that it is difficult to cope with higher recording speeds.

On the other hand, as an improvement over the above cited one, Japanese Patent Application Laid-Open No. 57-187296 discloses that at least red and blue P.
There is one in which a transfer layer containing transfer capsules of eight primary colors of yellow and yellow is formed on the entire main surface of the base paper, and each capsule is set at a different point.

The publication 2 states that transferred images of each color can be obtained by simply controlling the temperature of the heating head, and that the apparatus can be simplified.

However, the microcapsules containing the entire heat-melting ink have the drawback that the capsule wall is hardly destroyed even under high applied voltage, and the transferred image is insufficient.

In order to solve these shortcomings, the present inventors conducted tax research and found that all of the heat-melting inks consisting of eight primary colors of magenta, cyan, and yellow with different melting points were emulsified, mixed, and dispersed to form a support. By coating with No. 1, it was possible to provide a multicolor thermal transfer recording paper capable of obtaining multicolor transfer images only by controlling the temperature of the heating head.

According to the present invention, the inks of the eight primary colors of magenta, cyan, and yellow are individually and evenly present as emulsion particles on the coated surface of the support, and can be easily applied to the plain paper surface with a heat-generating head. It has the advantage that it can be transferred to

In addition, the milk of the emulsion of the three primary colors of ink has the advantage that a clear transferred image can be obtained because it is transferred to the paper surface as fine halftone dots due to the unique melting point difference of each ink. .

Furthermore, when the emulsion of the ink is an aqueous element,
Another advantage is that in the form of an aqueous dispersion, multicolor thermal transfer recording paper can be easily produced in large quantities by one coating.

The present invention will be explained in detail below.

Magenta, cyan, and - having different melting points according to the present invention
The emulsified particles of all yellow heat-melting inks are coated irregularly on a support ($P#), so that the @ton of each ink increases in the order of magenta, cyan, and yellow. Suppose you set it to . When using an original with a multicolor image and trying to transfer the magenta/red image part on the image, the magenta recording signal in the image signal is heated to the temperature of the low f-point of the magenta ink by the heat generating head. The magenta emulsified particles on the coated surface of thermal transfer paper can be easily transferred onto the plain paper surface.

Similarly, cyan and yellow can also be transferred depending on the difference in melting point.

Here, the emulsified particles of the three primary colors are irregularly scattered on the coated layer surface, and the thermally transferred plain paper surface is expressed as halftone dots.

To the hot melt ink according to the present invention? magenta, cyan,
The range of melting points of the eight primary colors of yellow is at least 1 G°C or higher, preferably 20°C or higher.

Next, the constituent materials of the multicolor thermal transfer recording paper according to the present invention will be explained.

The support should be thin in terms of transfer characteristics, with a thickness of 10 to 80
Papers such as μm capacitor paper and glassine paper, or resin films such as polyester, polyimide, polycarbonate, and Teflon are used.

The 148 melt ink mainly consists of waxes, low melting point resins, colorants and softeners, and is obtained by thoroughly dispersing and mixing all of these.

Examples of waxes that can be used include paraffin wax, microcrystalline wax, beeswax, spermaceti wax, shellac wax, carnauba wax, Chiante IJ wax, montan wax, and low-molecular polyethylene wax.

Examples of low-melting point resins include ethylene/bicopolymer, ethylene/acrylate copolymer, butadiene/styrene copolymer, vinyl acid/vinyl chloride copolymer, polyvinyl acid, rosin and rosin derivatives, petroleum hatsumode, etc. is used.

As the coloring material, commonly used inorganic pigments, organic pigments, or dyes may be used for magenta, cyan, and yellow.

As the softener, for example, oleic acid, castor oil, dioctyl phthalate, liquid paraffin or mineral oil can be used.

The method for producing the multicolor thermal transfer recording paper of the present invention includes:
A method in which an aqueous dispersion coating liquid is applied to the entire surface of the support using a general coater such as an air knife coater, a method in which an aqueous dispersion is applied to the entire surface or a part of the support using a flexo printing machine, etc. can be mentioned.

It is preferable that the coated paper coated by the above-mentioned methods be improved in flatness by using a method such as a super calender, a machine calender, or a cross calender to improve the flatness of the paper.

Furthermore, in addition to the emulsion particles of the magenta, cyan, and yellow heat-melting inks according to the second aspect of the present invention, emulsion particles of an emulsion of black or other color ink may also be added as appropriate. do not have.

The present invention will be specifically described below using Example e6. Na2
, "Part" in Examples indicates 1 part by weight.

Example (1) What is the composition of ink for the eight primary colors of magenta, cyan, and yellow? It is shi. - Each of the above-mentioned hot melt ink gold was prepared by mixing the above materials until homogeneous while melting.

(2) Emulsions of magenta, cyan, and yellow inks were prepared as follows.

Hot melt ink: 80 parts Nonionic surfactant: 2 parts Water: 68 parts Emulsions of each ink were prepared using the above ratios.

Regarding magenta ink with a melting point of 50°C,
First, add 2 parts of nonionic surfactant to a container containing 68 parts of water and disperse well. At this time, the liquid temperature is maintained at 60"Cvtc, which is higher than the ink's melting point of 50°C.

Meanwhile, pre-melted magenta ink is gradually added to the rice field in which the surfactant is dispersed.

The rotational speed of the kakuhan is increased, and when the emulsified particles have a uniform particle size of about 6 fim, the liquid temperature is gradually lowered to room temperature, and emulsification of the magenta ink is completed.

In the same way, cyan and yellow inks are also applied. However, cyan ink is processed at 75°C, and yellow ink is processed at 90°C.

M) A multicolor thermal transfer recording paper was prepared as follows.

An 80% thick aqueous dispersion consisting of 30 parts each (solid content) of the magenta, cyan, and yellow heat-melting ink emulsions prepared in (2) above and 6 parts of microcrystalline/wax emulsion; 2 using the Meyer bar.
It was coated on 5 g and 7 m of thin glassine paper at a dry coating weight of about 5 JI/hair.

Using a super calendar for the coated paper obtained here,
By applying Sky/d pressure to impart smoothness, it was possible to produce the desired multicolor thermal transfer recording paper.

When the coated surface of this multicolor thermal transfer recording paper was layered with plain paper and printed using a facsimile tester manufactured by Matsushita Electronic Components with applied energy corresponding to the melting points of magenta, cyan, and yellow inks, each corresponded to the plain paper surface. TFJ has produced a multicolor thermal transfer recording with clear color halftone dots.

Claims (1)

[Claims] Heat-melting inks consisting of primary colors of maze/green, cyan, and yellow with different melting points are emulsified and mixed.
Multicolor thermal transfer recording paper made by dispersing and coating on a support.