JPH04320892A - Image receiving paper for thermal transfer recording - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an image receiving paper for thermal transfer recording, and more specifically to a dye transfer type image receiving paper that has good dyeability, can record at high density, and has good storage stability. This invention relates to image receiving paper for thermal transfer recording.

0002

[Prior Art] Dye transfer type thermal recording is a recording method in which a color sheet for transfer recording is heated by a heating means such as a thermal head to transfer the dye onto an image receiving paper for transfer recording, and the color sheet is a base sheet. The image-receiving paper has a color material layer containing a vaporizable or heat-diffusible colorant and a binder resin as main components on one side of the substrate. It is set up and configured.

In the dye transfer type thermal recording described above, the image-receiving layer constituting the image-receiving paper is required to have the following performance. (1) During transfer recording, there is no fusion with the color sheet, and after recording, it is easy to separate from the color sheet, and recording with good gradation can be obtained. (2) The dye has good dyeing properties in the image-receiving layer, and high-density recording is possible. (3) The recorded material should have good storage stability such as light resistance, dark fading resistance, bleeding resistance, and migration resistance.

0004

[Problems to be Solved by the Invention] In order to achieve the above-mentioned performance of image-receiving paper, it is important to select the formulation of the resin and auxiliary agents that form the image-receiving layer, but conventionally known formulations do not provide sufficient performance for image-receiving paper. is difficult to obtain. The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide an image receiving paper for thermal transfer recording which has good dye-dyeability, allows high-density recording, and has good storage stability. It's about doing. In general, in conventional image-receiving layers, when trying to improve the dyeability, the storage stability, especially the bleeding and migration properties of the image deteriorate, making it impossible to obtain well-balanced characteristics. On the other hand, according to the present invention, surprisingly, an image-receiving layer with a good balance of dyeability and storage stability is provided.

[0005]

[Means for Solving the Problems] That is, the gist of the present invention is to provide an image-receiving paper for thermal transfer recording of a dye transfer type in which an image-receiving layer containing a dye-dying resin is formed on the surface of a base material. An image-receiving paper for thermal transfer recording, characterized in that it contains a fatty acid ester of a polyhydric alcohol.

The present invention will be explained in detail below. The image-receiving paper for thermal transfer recording of the present invention is constructed by providing an image-receiving layer containing a dye-dying resin on the surface of a base material, similarly to conventionally known image-receiving papers.

The dye-dying resin used in the image-receiving layer of the present invention includes saturated polyester, acrylic resin, methacrylic resin, styrene resin, polycarbonate resin, cellulose acetate, polyvinyl acetal resin, polyvinyl phenyl acetal resin, and vinyl chloride resin. , vinyl chloride/vinyl acetate copolymer resin, polyarylate resin, AS resin, or the above-mentioned crosslinked products. These resins have excellent dyeing properties for vaporizable or heat-diffusible dyes. Further, as the base material, commonly used base materials such as synthetic paper and cellulose paper are used.

Examples of polyhydric alcohols include aliphatic polyhydric alcohols such as glycerin, sorbitol, sucrose, alkylene glycol, and polyalkylene glycol. On the other hand, fatty acids include caprylic acid, capric acid,
Examples include lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, and behenic acid.

The content of the fatty acid ester of polyhydric alcohol in the image-receiving layer is preferably in the range of 2 to 50% by weight, preferably 10 to 30% by weight based on the dye-dying resin. Furthermore, in the image receiving paper for thermal transfer recording of the present invention, a release agent and various stabilizers can be contained in the dye-dying resin, if necessary. Of course, fatty acid esters of polyhydric alcohols can be used not only alone but also as two
It can also be used as a mixture of more than one species.

The image-receiving paper for thermal transfer recording of the present invention is prepared by preparing a coating liquid containing a dyeable resin and a fatty acid ester of a polyhydric alcohol by using an appropriate solvent.
This can be obtained by applying this to a base material and drying it to form an image-receiving layer. The thickness of the image-receiving layer (coating film thickness after drying) is usually 0.1 to 20 μm, preferably 1 to 10 μm.
It is assumed to be in the range of μ.

[0011] The coating method can be arbitrarily selected from commonly used methods, and for example, a method using a reverse roll coater, gravure coater, rod coater, air doctor coater, die coater, etc. can be appropriately adopted. For details of these methods, refer to "Coating Method" by Yuji Harasaki (published by Maki Shoten in 1977).

[0012] The color sheet for thermal transfer recording used with the image-receiving paper of the present invention contains azo, anthraquinone, nitro,
Various nonionic dyes such as styryl, naphthoquinone, quinophthalone, azomethine, coumarin, and fused polycyclic dyes are preferably used.

[0013]

[Examples] The present invention will be explained in more detail by examples below, but the present invention is not limited to the following examples unless it exceeds the gist thereof. In addition, below, “
"Parts" means "parts by weight."

Example 1 (a) Preparation of image-receiving paper First, 10 parts of polyvinyl phenylacetal resin represented by the following chemical formula [Chemical formula 1] was dissolved in a mixed solvent of 15 parts of methyl ethyl ketone and 15 parts of toluene. In the solution, 1.5 parts of behenic acid monoglyceride (trade name: EXEPAL G-MB, manufactured by Kao Corporation) and amino-modified silicone (trade name: "KF-393",
(manufactured by Shin-Etsu Chemical Co., Ltd.) was added to prepare a coating liquid. Then, with a wire bar, the thickness was 150 μm.
The above coating solution was coated on polypropylene synthetic paper of 5 µm and dried to form an image receiving layer having a dry thickness of about 5 μm to prepare an image receiving paper.

[0015]

[Chemical formula 1]

(b) Preparation of color sheet A magenta pigment 5 represented by the following chemical formula [Chemical formula 2] is applied to a biaxially oriented polyethylene terephthalate film (4.5 μm thick) whose back side of the ink-coated surface has been treated with a heat-resistant slippery finish. 10 parts of polycarbonate resin, and 85 parts of toluene was applied and dried to form a coloring material layer having a dry thickness of about 1 μm to prepare a color sheet.

[0017]

[Case 2]

(c) Transfer recording test and storage stability test of recorded material (i) Transfer recording test The ink coated surface of the above color sheet and the image receiving layer surface of the above image receiving paper were overlapped, and a heating resistance of 6 dots/mm was applied. Recording was performed under the following conditions using a partial gray line thermal head with body density. The transfer density of the obtained recorded matter was measured, and the results are shown in Table 1 below. recording line density
6 lines/mm thermal head applied power 0.3
0W thermal head application pulse width 6m
seconds

(ii) Storage stability test of recorded material The above recorded material was stored at 60°C x 60% R. H. The recording material was maintained under these conditions for 7 days, and the degree of color bleeding of the recorded material was then measured using a microdensitometer (manufactured by Sakura Corporation, PDM-5). The results are shown in Table 1.

[0020] The bleeding property values in the table indicate the increase ratio (b/a) of the length of the base of each curve in the density distribution curve of a one-dot transferred image shown in FIG. The smaller the value, the better.

Example 2 An image-receiving paper was prepared in the same manner as in Example 1, except that a yellow dye represented by the following chemical formula [Chemical formula 3] was used instead of the dye used in Example 1(b). A color sheet was prepared and tested. The results are shown in Table 1.

[0022]

[Chemical formula 3]

Example 3 An image-receiving paper was prepared in the same manner as in Example 1, except that a cyan dye represented by the following chemical formula [Chemical formula 4] was used instead of the dye used in Example 1(b). A color sheet was prepared and tested. The results are shown in Table 1.

[0024]

[C4]

Examples 4 to 9 Oleic acid monoglyceride (trade name: Excel O-95R, manufactured by Kao Corporation) (Example 4,
5, 6) or sorbitan monolaurate (product name:
Rheodor Super SP-S10) (Examples 7, 8, 9)
Tests were conducted using image-receiving paper and color sheets prepared and tested in the same manner as in Examples 1 to 3, except that the following methods were used. The results are shown in Table 1.

Examples 10 to 12 Except for using a saturated polyester resin (trade name: "Vylon-290", manufactured by Toyobo Co., Ltd.) instead of the polyvinyl phenylacetal resin used in the image-receiving layer in Examples 1 to 3. prepared image-receiving paper and color sheets in the same manner as in Examples 1 to 3 and conducted tests. The results are shown in Table 1.

Comparative Examples 1 to 3 Image receiving papers and color sheets were prepared and tested in the same manner as in Examples 1 to 3, except that the behenic acid monoglyceride used in the image receiving layer in Examples 1 to 3 was not used. Ta. The results are shown in Table 1.

Comparative Examples 4 to 6 Image receiving papers and color sheets were prepared and tested in the same manner as in Examples 10 to 12, except that the behenic acid monoglyceride used in the image receiving layer in Examples 10 to 12 was not used. Ta. The results are shown in Table 1.

In the table, the resin symbol "A" represents polyvinylphenyl acetal resin, and "B" represents saturated polyester resin.

[Table 1]

[0030]

Effects of the Invention According to the present invention as described above, there is provided an image receiving paper for thermal transfer recording that has a good balance between dye fixing properties and bleeding properties. Good recorded matter can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a graph showing a density distribution curve of a 1-dot transferred image, where the horizontal axis shows the length of 1 dot and the vertical axis shows the transfer density.

Claims (1)

[Claims] [Claim 1] An image-receiving paper for dye transfer type thermal transfer recording comprising an image-receiving layer containing a dye-dying resin formed on the surface of a base material, wherein the image-receiving layer contains a fatty acid ester of a polyhydric alcohol. An image receiving paper for thermal transfer recording characterized by the following.