JP2699333B2 - Method for producing transfer body for thermal transfer recording - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a transfer member used for sublimation-type thermal transfer recording. 2. Description of the Related Art The basic characteristics required for a binder of a sublimation type transfer body are to improve the adhesiveness between a base material and a color material layer, and to make the transfer material color material layer and image receiving paper (recording paper) in thermal transfer recording. And to prevent fusion between them. Conventionally, many resins such as a crosslinkable resin, a polyester resin, and a cellulose resin have been proposed as a binder.
(For example, Japanese Patent Application Laid-Open No. 58-215397) Problems to be Solved by the Invention Conventionally, binders that have been conventionally proposed are almost heat-resistant resins or crosslinkable resins in order to prevent fusion during thermal transfer recording. And a polyester resin having good adhesion to the base. High heat resistant resin prevents heat fusion,
In particular, the recording density in the low density range is low. Polyester-based resins have good adhesion to the base material, but have problems such as that heat fusion easily occurs in a high heat energy region. SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for producing a transfer body which is free from heat fusion with an image receiving paper, has a high recording density particularly in a low density region, and has good adhesion between a substrate and a color material layer. Means for Solving the Problems An organic solvent-soluble resin (A resin) having a heat distortion temperature of 100 ° C. or higher, a thermoplastic copolymer polyester resin (B resin) soluble in an organic solvent, a sublimation dye, and an organic solvent In the ink consisting of: the mixing ratio of the resin A is 1 in 100 parts by weight of the total amount of the resin A and the resin B;
0 to 90 parts by weight, the blending ratio of the B resin is 90 to 10 parts by weight of the ink is applied on a substrate, the binder comprising the A resin and the B resin, A method for producing a thermal transfer recording transfer body having a coloring material layer composed of a sublimation type dye on a base material, and further, the A resin is composed of at least one selected from polysulfone, polycarbonate and polyphenylene oxide. This is a method for producing a transfer body for thermal transfer recording. Action A resin having a heat distortion temperature of 100 ° C. or more prevents heat fusion in a high heat energy part. The copolyester resin maintains adhesion to the substrate and exhibits flexibility in a low concentration range (low energy range), so that the color material layer and the image receiving body are easily adhered to each other, and a high recording density is obtained. . Embodiment FIG. 1 is a schematic cross-sectional view of a transfer body according to an embodiment of the present invention. A color material layer 2 is provided on one side of the substrate 1. The color material layer 2 includes at least a dye 3 and a binder 4. As the substrate 1, various substrates can be used and are not particularly limited. In general, polyester films, for example, polyethylene terephthalate film, polyethylene naphthalate film, and films obtained by adding running stability to a thermal head to these films, or various films having more excellent heat resistance can be used. Further, a substrate having conductivity imparted to itself or a substrate having conductivity imparted to at least one surface of the substrate may be used. These substrates can be mainly used, for example, for thermal transfer recording using a current-carrying head. The dye is not particularly limited as long as it can be used in a sublimation type thermal transfer recording method such as a disperse dye or a basic dye. The binder is at least composed of a resin having a heat distortion temperature of 100 ° C. or higher and a copolymerized polyester resin. Here, the heat distortion temperature is a temperature determined by the test method of the American Society for Testing and Materials (ASTM, D648, load 18.6 kg / cm ² ). Examples of the resin having a heat deformation temperature of 100 ° C. or higher include polysulfone, polycarbonate, polyphenylene oxide, and polyarylate. Particularly, a resin having a heat distortion temperature of 120 ° C. or more is preferable. As the thermoplastic copolymer polyester resin, for example, Byron (trade name, Toyobo Co., Ltd.), Polyester (trade name, Nippon Synthetic Chemical Industry Co., Ltd.) or the like can be used. The copolymerized polyester resin is an isocyanate compound,
The reaction product may be formed by a combination with a curing agent such as an epoxy resin, a melamine resin, and a phenol resin.
The mixing ratio of the resin having a heat distortion temperature of 100 ° C. or more and the copolymerized polyester resin is 10 to 90 parts by weight for the former and 10 for the latter for the latter.
The mixing effect is large in the range of 90 to 10 parts by weight. 100 binder
It may be a mixture of a resin having a heat distortion temperature of not less than ° C and a copolymerized polyester resin, or a reaction product. Also, 100 ℃
When the resin having the above heat distortion temperature and the copolymerized polyester resin are incompatible, good characteristics are exhibited. The coloring material layer may contain a surfactant, a release agent, fine particles and the like in addition to the dye and the binder. Hereinafter, specific examples will be described. Example A 6 μm PET film having a slippery heat-resistant layer on the back surface was coated with an ink having the following composition by a wire bar to obtain a transfer body. <Ink> Dye of the following structural formula (A) 1.5 parts by weight polysulfone (P-1700, heat distortion temperature: 175 ° C, Nissan Chemical Industries, Ltd.) 2.0 parts by weight Copolymerized polyester resin (Byron 220, Toyobo Co., Ltd.) 2.0 Parts by weight monochlorobenzene 100 parts by weight Next, an aqueous polyester resin (MD1200, Toyobo Co., Ltd.) 25 parts by weight, colloidal silica (solids 40 wt%) 40 parts by weight, polyethylene emulsion (solids 20 wt%) 20 parts by weight on one side of polypropylene synthetic paper The coating material was applied with a wire bar to obtain an image receiving paper having a dyeing layer having a thickness of about 5 μm. Hereinafter, thermal transfer recording was performed under the following conditions. Dot density for main and sub scanning: 6 dots / mm Recording power: 0.5 W / Dot head heating time: 2 to 8 ms After recording, there is no thermal fusion with the receiving paper and the color sheet from the receiving paper surface Peeling was also easy. FIG. 2 shows the obtained recording density curve. Also, the adhesion between the base material and the color material layer is as follows: Adhesive tape (Nichiban) with a width of 12 mm
After bonding at a length of 0 mm, the film was peeled off at a constant speed (1 cm / sec) and tested. As a result, the coloring material layer did not peel off from the substrate at all. (Comparative Example) An ink having the following composition was applied to the surface of the same PET film as in the example using a wire bar to obtain a transfer body. This transfer body is designated as transfer body A. <Ink> Dye 1.5 parts by weight polysulfone 4.0 {monochlorobenzene 100} used in the examples Inks having the following composition were coated on the surface of the same PET film as in the examples using a wire bar to obtain a transfer body. This transfer body is designated as transfer body B. <Ink> 1.5 parts by weight of pigment used in the examples Copolymerized polyester resin (Vylon 220) 4.0 〃 Monochlorobenzene 100 に つ い て The same image-receiving paper as that of the examples for the transfer members A and B,
Recording was performed under recording conditions. As a result, the transfer body A did not thermally fuse with the image receiving paper, but the transfer body B thermally fused with the image receiving paper from 7 ms.
FIG. 2 shows a recording density curve obtained by the transfer body A.
The adhesion between the base material of the transfer body A and the colorant layer was very poor, and almost the entire adhesive surface of the adhesive tape was easily peeled off. Effects of the Invention According to the present invention, it is possible to obtain a transfer body which has no thermal fusion with an image receiving paper, has a high recording density especially in a low density region, and has good adhesion between a substrate and a color material layer.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-sectional view of a transfer body shown as an example of the present invention, and FIG. 2 is a recording density curve diagram obtained as an example and a comparative example in the present invention. . 1 ... substrate, 2 ... color material layer, 3 ... dye, 4 ... binder.

Continuation of front page    (56) References JP-A-60-190389 (JP, A)                 JP-A-59-14994 (JP, A)                 JP-A-61-189994 (JP, A)                 JP-A-61-188193 (JP, A)                 JP-A-61-116583 (JP, A)                 JP-A-61-286199 (JP, A)

Claims (1)

(57) [Claims] In a method for producing a transfer body having a color material layer on a base material, an organic solvent-soluble resin (A resin) having a heat distortion temperature of 100 ° C. or more, and an organic solvent-soluble thermoplastic polyester resin (B resin) A, comprising a sublimable dye and an organic solvent, and wherein the mixing ratio of the A resin and the B resin is 10 to 90 parts by weight when the total amount of both resins is 100 parts by weight. Using a colorant layer forming ink in which the B resin is 90 to 10 parts by weight, applying the ink on a substrate, and forming a binder comprising the A resin and the B resin on the substrate. And a method for producing a transfer body for thermal transfer recording, in which a color material layer composed of the above-mentioned sublimable dye is formed. 2. 2. The method according to claim 1, wherein the resin A is at least one selected from polycarbonate and polyphenylene oxide.