JPS6225089A - Image receiving sheet for thermal transfer recording medium - Google Patents

Abstract

PURPOSE:To enhance heat sensitivity and to prevent sticking between an image receiving sheet and a transfer material 1, by a method wherein a thermoplastic resin is contained in the image receiving layer of the image receiving sheet used for a thermal transfer recording medium which is coated with ink material mainly composed of dye. CONSTITUTION:With an image receiving sheet 2, an image receiving layer 22 is formed by providing a layer, containing polyester resin and thermoplastic resin, on a substrate 21 with 30-500mum thickness and Bekk smoothness of 200sec or over. As the thermoplastic resin, a resin selected from among epoxy, melamine, and phenol can be used in addition to an isocyanate compound. As the polyester resin, a linear saturated polyester having a hydroxyl or calboxyl group at the tip end thereof can be used. In this manner, the heat sensitivity and the tackiness are improved. The reason is considered as follows, but not defined. The addition of the thermoplastic resin reduces tackiness between the transfer material 1 and the image receiving sheet 2 and the deformation of the surface of the image receiving sheet 2; which facilitates the transfer of the dye from the coloring material layer 12 to the image receiving layer 22, whereby heat sensitivity being improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an image receiving sheet used in a thermal transfer recording method, and particularly to a thermal transfer recording medium coated with an ink material containing a dye as a main component. This invention relates to the image receiving sheet used.

[Conventional technology]

In the thermal transfer recording method, a thermal transfer recording medium (hereinafter abbreviated as transfer body) comprising a color material layer provided on a base material and an image-receiving sheet on which an image is formed are put together, and thermal transfer is applied from the base material side of the transfer body. By heating using a heating element such as a head, the coloring material is transferred to the surface of the image-receiving sheet and recording is performed.

FIG. 2 is a block diagram illustrating such a thermal transfer recording method in degrees Celsius.

In the m2 diagram, 1 is the transfer body, the base material 11 and the coloring material layer 1.
2 is an image receiving sheet, and 3 and 4 are a thermal head and a platen ruler, respectively.

In the recording method No. 0, multicolor recording or color recording can be easily performed by changing the hue of the coloring material layer 12. ■
Since developing and fixing are not required, the device can be made smaller and more economical. ■Unlike inkjet recording or electrophotographic recording, it does not require the use of liquid ink or toner material (liquid or powder), and has the advantages of being highly reliable as a recording device.

It is being considered for use in the fields of color printing and color facsimile.

FIG. 3 is a predetermined sectional view for explaining the thermal transfer recording medium 1 in more detail. In FIG. 3, numerals 11 and 12 are the same as in FIG. 2 (base material and color material layer, and 13 indicates a slippery heat-resistant layer, which is provided as necessary to improve the heat resistance of the base material 11. Here, if a coloring material layer 12 is provided by coating a dye-based coloring agent such as a sublimable dye on the base material 11 with a binder, the so-called gradation property, in which the transfer density can be controlled by the applied energy, can be achieved. A transfer body 1 with good quality can be obtained [Suguchi et al., Journal of the Institute of Image Electronics Engineers, Vol. 12, p. 18 (19
83)]. At this time, the base material 11 is used as the image receiving sheet 2.
A material coated with polyester resin is used.

FIG. 1 shows a cross-sectional view of such an image-receiving sheet 2, in which 21 represents a base material and 22 represents an image-receiving layer.

As the base material 21, a material having a thickness of 30 μm to 500 μm and a surface smoothness of 200 seconds or more is used. The image-receiving sheet 2 includes a base material 21 coated with acidic fine particles together with a polymeric binder (see JP-A-59-162091), an organic filler and a heat-softening molten resin coated (JP-A-59-162091); No. 59-214696 is also known.

[Problem that the invention seeks to solve]

However, when these image receiving sheets 2 are used,
The recording pulse width was 2 to 8 ms, which required significantly greater energy to be applied than with ordinary thermal paper. Therefore, the recording time is long, and it is desirable to improve the thermal sensitivity. (Refer to Nikkei Electronics 2Nix, published on February 13, 1984, No. 119 JX.) Also, in areas where the recording area is large, the image receiving sheet 2 and the transfer body 1 tend to stick together (this is a problem that can easily cause problems as a device). was there.

An object of the present invention is to provide an image-receiving sheet for a thermal transfer recording medium that has improved thermal sensitivity and has less adhesion to a transfer body.

(Means for Solving the Problems) The thermal transfer recording medium receiver 19 according to the present invention has a thickness of 30 to 500 μm and a surface surface smoothness of 200 μm.
Polyester resin and a small amount (both 1
A layer containing a thermosetting resin is provided to serve as an image-receiving layer.

[Effect]

In this invention, since the image-receiving layer contains a thermosetting resin, the heat resistance of the image-receiving layer is improved, and its thermal sensitivity and adhesiveness are improved. The present invention will be described in detail below, but FIG. 1, which was used to explain the conventional example, will be used as a drawing of an embodiment of the present invention.

[Example 1] A paint having the following composition was applied onto a base material 21 of 110 μm polypropylene synthetic paper (manufactured by Oji Yuka Co., Ltd.) using a wire bar, and dried at 60° C. to produce an image-receiving sheet 2. . The coating film thickness was approximately 2 μm and 7j.

A fan-shaped saturated polyester (manufactured by Toyobo Co., Ltd.) and a paint having the following composition are then applied onto a base material 11 consisting of a 9 μm PET film that has been heat-resistant treated with a lubricating heat-resistant layer 13 on the back surface to form a transfer body 1. was produced.

The transfer member 1 and the image receiving sheet 2 were placed one on top of the other, and an image was formed by heating from a thermal head 3Vc under the following recording conditions.

As a result of step 7, homogeneous cyan dye images with densities (0.15 to 1.83) corresponding to the dots were obtained at each heating time.

Here, as the thermosetting $4 resin, in addition to the above-mentioned isocyanate compounds, one selected from epoxy, melamine, and phenol can be used. Further, as the polyester resin, it is appropriate to use a linear saturated polyester having a hydroxyl group or a carboxyl group at the end. Specific examples include Byron 200°103.300 manufactured by Toyobo Co., Ltd. and the like.

The reason why the heat sensitivity and adhesiveness are improved by this invention is not necessarily clear, but it is thought that the most significant reason is that the heat resistance of the image receiving layer 22 is improved by the addition of the thermosetting resin. In other words, the adhesiveness between the transfer body 1 and the receiving sheet 2 is reduced by increasing the thermal deformation temperature, and the deformation of the surface of the image receiving sheet 20 is also reduced, so that the dye can easily transfer from the coloring material layer 12 to the image receiving layer 22. It is estimated that the thermal sensitivity will improve. The advantage of improved thermal sensitivity is a new effect that was not initially expected by adding a thermosetting resin.

[Comparative Example 1] Image receiving sheet 2 was prepared in the same manner except that the isocyanate compound, which is a thermosetting resin, was not used in Example 1afl+J1w.
was produced. When recording was performed in the same manner as in Example 1, 1
．． A pulse application time of 6 ms is required to obtain a density of 5, and adhesion between the image receiving sheet 2 and the transfer member 1 occurs in areas with a large printing area.

[Examples 2 to 4] In Example I, the name in parentheses in the section of the isocyanate compound-replaceable resin indicates the manufacturing company and its trade name.

When recording was performed in the same manner as in Example 1, the thermal recording properties were almost the same as in Example 1, and ftaf! ll! No eyebrows were observed. Thermosetting resins used in Examples 2 to 4 Table 1 [Effects of the invention] As explained above, this invention provides a thermal transfer recording medium having an image-receiving layer on a base material. In the image-receiving sheet, an image-receiving layer consisting of a layer containing a polyester resin and at least one thermosetting resin was formed.

Since recording is possible with higher sensitivity and there is no adhesion with the transfer member, there are advantages of shorter recording time and improved running stability.

[Brief explanation of drawings]

FIG. 1 is a sectional view for explaining an embodiment of the present invention and a conventional image receiving sheet, FIG. 2 is a block diagram of a thermal transfer recording method, and FIG. 3 is a sectional view of a thermal transfer recording medium. In the figure, 1 is a transfer body, 2 is an image receiving sheet, 3 is a thermal head, 4 is a platen ruler, 11 is a base material for transfer, 12 is a coloring material layer, 13 is a slippery @ 14T-121 is a material for an image receiving sheet. The base material 22 is an image receiving layer.

Claims (3)

[Claims] (1) An image-receiving sheet for a thermal transfer recording medium, which uses a base material having a thickness of 30 μm to 500 μm and a surface Beck smoothness of 200 seconds or more, and an image-receiving layer is provided on the base material, in which a polyester resin is used as the image-receiving layer. An image-receiving sheet for a thermal transfer recording medium, comprising a layer containing at least one type of thermosetting resin. (2) The image-receiving sheet for a thermal transfer recording medium according to claim (1), wherein the thermosetting resin is selected from isocyanate, epoxy, melamine, and phenol. (3) The image-receiving sheet for a thermal transfer recording medium according to claim (1), wherein a linear saturated polyester having either a hydroxyl group or a carboxyl group at the end is used as the polyester resin.