JPS61143474A - Thermally sublimable or thermally vaporizable printing ink - Google Patents

Abstract

PURPOSE:To provide the titled thermally transferable ink capable of giving a solid surface with a transferred layer having high blocking resistance and excellent color balance, by adding a thermosetting acrylic resin or a specific rosin-modified phenolic resin as a vehicle. CONSTITUTION:The objective ink can be prepared by homogeneously mixing (A) a thermally sublimable or vaporizable dye, (B) a thermosetting acrylic resin or a rosin-modified phenolic resin having a softening point of >=150 deg.C and (C) a solvent. The amounts of the components B and C are preferably 0.5-3pts. (wt.) and 2-5pts. per 1 pt. of the component A, respectively.

Description

Detailed Description of the Invention [Technical Field] The present invention relates to thermal sublimation or thermal vaporizable printing for thermal transfer sheets used when performing thermal transfer to solid surfaces such as textiles, metals, paper, and plastic films. It concerns ink.

[Prior art]

Conventionally, a thermal transfer method is known in which a transfer layer containing a heat-sublimable or heat-vaporizable dye is heated, and the dye sublimated or vaporized by the heating is dyed onto a solid surface to form a dye image. For example, Special Publication No. 47-51734
According to the publication, a transfer sheet is proposed in which an ink formed by mixing a sublimable dye, a water-soluble binder, and water is gravure printed on a support sheet. This transfer sheet is mainly applied to thermal transfer to non-woven fabric surfaces,
When applied to thermal transfer to paper or plastic film with highly smooth surfaces, because the adhesion between the transfer sheet surface and the paper or plastic film surface is high, some of the dye in the transfer layer is removed when the two are peeled off after thermal transfer. may adhere to the paper or plastic film surface, causing blocking of the transfer layer.
The transfer sheet has the disadvantage that it loses its function and cannot transfer a large number of sheets.

It is known that thermosetting epoxy resin is added to ink to prevent blocking.

In the case of an ink containing this epoxy resin, the adsorption bonding force of the sublimable dye to the cured epoxy resin contained in the ink changes depending on the type of dye. Therefore, when thermal transfer is performed on a large number of sheets using a multicolor transfer sheet formed using such ink, the proportion of dye transferred to the transfer object changes depending on the type of transfer material, and as a result, the color balance changes. My body collapses.

〔the purpose〕

The present invention provides a thermal transfer printing ink that overcomes the drawbacks of conventional inks as described above, does not cause blocking of the transfer layer, and can provide a multicolor transfer image with good color balance upon transfer. The purpose is to

〔composition〕

According to the present invention, in a printing ink containing a thermally sublimable or thermally vaporizable dye, a thermosetting acrylic resin or a rosin-modified phenolic resin having a softening point of 150° C. or higher is added as a vehicle. A sublimable or thermovaporizable printing ink is provided.

In the present invention, the resin added to the ink as a vehicle is a thermosetting acrylic resin (Paraloid thermal crosslinking type containing melamine as a crosslinking agent, self-crosslinking type, etc.) or modified rosin with a softening point of 150°C or higher. It is a phenolic resin,
These products are conventionally commercially available, and commercially available products can be used as they are.

As the heat sublimable or heat vaporizable dye used in the present invention, conventionally known dyes are used, and such dyes include, for example,
It is appropriately selected from disperse dyes, oil-soluble dyes, acid dyes, mordant dyes, vat dyes, basic dyes, and the like.

The ink of the present invention comprises 1 part by weight of the above heat sublimable or heat vaporizable dye, 0.5 to 3 parts by weight of a thermosetting acrylic resin or rosin-modified phenolic resin, and 0.5 to 10 parts by weight of a solvent, preferably , by uniformly mixing 2 to 5 parts by weight. In this case, the solvent may be acetone, methyl ethyl ketone, methyl isobutyl ketone,
Orthodichlorobenzene, xylene, etc. are used alone or in the form of a mixture of two or more.

The ink of the present invention is applied as a printing ink for producing a thermal transfer sheet. That is, a desired image (including a multicolor image) is printed using the ink on a support sheet such as a piece of paper, synthetic paper, or plastic film. The printed material obtained in this way is used as a thermal transfer sheet, and is superimposed on the surface of fiber paper, metal, or plastic film.
A transferred image can be obtained on the solid surface by heating with infrared irradiation or the like. When using the ink of the present invention, since the acrylic resin or phenol resin used as the vehicle is thermosetting, blocking of the transfer layer does not occur during transfer.
Also, these resins are different from conventional epoxy resins,
Since it does not show any particular selective adsorption to dyes, the resulting multicolor image has good color balance. Furthermore, the thermal transfer sheet obtained using the ink of the present invention has the advantage that the resin used as a vehicle does not soften or melt even at the thermal transfer temperature, and the transfer layer does not block during thermal transfer, so a large number of sheets can be transferred. It can be performed.

〔effect〕

The printed matter obtained using the ink of the present invention can be applied as a heat-sensitive transfer sheet, and the transferred image can be applied to various solid surfaces, but in this case, the problem of blocking of the transfer layer does not occur during transfer. , and the multicolor transfer image obtained on the solid surface has good color balance, and it is also possible to perform multiple transfers using a single transfer sheet.

〔Example〕

Next, the present invention will be explained in more detail with reference to Examples. Note that all parts and percentages shown below are based on weight.

Example 1 (1) Printing ink for thermal transfer [1] Heat sublimation dye (color: yellow) 1 part (product name: Kayaset Yellow G, manufactured by Nippon Kayaku Co., Ltd.) Thermosetting acrylic resin 2 parts (product) Name: KSIOI, manufactured by Mino Group) Solvent (methyl isobutyl ketone) 4 parts (2) Printing ink for thermal transfer (II) Heat sublimation dye (color: red) 1 part (Product name: Kayaset Red 026, Nipponka) (manufactured by Yakusha) Thermosetting acrylic resin 1.5 parts (same as ink (1) above) Solvent (methyl isobutyl ketone) 4 parts Ink (1) and (n) consisting of a homogeneous mixture of the above component compositions Each was used to print on paper (high-quality paper, basis weight 60 g/I) as a support sheet to produce two-color prints (dry coating weight 8
g/a) was obtained.

Next, this two-color printed material was used as a thermal transfer sheet, and paper (high-quality paper, basis weight 8
0 g/rrr) were stacked on top of each other and heated at a temperature of 170° C. by infrared irradiation from the back side of the printed matter. As a result, a clear two-color image with good color balance was obtained on the receiving sheet. In this case, the transfer layer of the transfer sheet did not directly adhere to the receiving sheet (blocking of the transfer layer), and no unevenness or staining of the transferred image occurred. In addition, by replacing only the receiving sheets one after another and performing thermal transfer in the same manner, it was possible to obtain a plurality of clear copies.

Example 2 (1) Thermal transfer ink (1) Heat sublimation dye (color: blue) 1 part (product name: Kayaset Blue 614, Nippon Kayakusha v1) Rosin-modified phenolic resin 1.5 parts (product name) : Tamanol 340, manufactured by Arayo Kagaku Kogyo Co., Ltd.) Solvent (xylene) 3 parts (2
) Thermal transfer ink (II) Heat sublimation dye (color: pink) 1 part (product name: Diaceriton Pink R manufactured by Mitsubishi Chemical Corporation) Rosin-modified phenolic resin 2 parts (same as the above ink ([3]) Solvent (xylene) 4 parts Ink CI consisting of a homogeneous mixture of the above component composition] and (n)
paper (high-quality paper,
A two-color print (dry coating weight: 8 g/ni') was obtained by printing on a paper (basis weight: 60 g/ni').

Next, this two-color printed material was used as a thermal transfer sheet, and paper (high-quality paper, basis weight 8
0g/m) were piled up and heated at a temperature of 170°C by infrared irradiation from the back side of the printed matter. As a result, a clear two-color image with good color balance was obtained on the receiving sheet. In this case as well, no blocking of the transfer layer was observed. Alternatively, by replacing only the receiving sheets one after another and performing thermal transfer in the same way.

I was able to obtain several clear copies.

Claims (1)

[Claims] (1) In a printing ink containing a heat sublimable or heat vaporizable dye, a thermosetting acrylic resin or a rosin-modified phenolic resin with a softening point of 150°C or higher is added as a vehicle. Thermoevaporable printing ink.