JPH03126585A - Image receiving medium for sublimation type thermal transfer - Google Patents

Abstract

PURPOSE:To enhance the releasability of an image receiving medium and a transfer recording medium after recording and to also enhance the transparency of the image receiving medium after recording by laminating an intermediate layer mainly consisting of a polyester resin and an isocyanate compound and a dye receiving layer mainly consisting of a vinyl chloride resin and a release agent in this order. CONSTITUTION:An image receiving medium is constituted of a transparent image receiving substrate A, a dye receiving layer B and an intermediate layer C. That is, the intermediate layer C mainly consisting of a polyester resin and an isocyanate compound and the dye receiving layer B mainly consisting of a vinyl chloride resin and a release agent are laminated to the transparent image receiving substrate A. A heat-sublimable dye is sublimed and diffused from the dye transfer layer 4 of a sublimation transfer recording medium by the heat from a thermal head 1 and the sublimed dye is transferred to the dye receiving layer B of the image receiving medium. The sublimed dye transferred to the image receiving medium is diffused throughout the dyeing resin forming the dye receiving layer B to dye the dyeing resin. By this constitution, the transparent image receiving substrate A receives no effect of the release agent in the dye receiving layer B and the adhesive strength of the transparent image receiving substrate A and the dye receiving layer B is kept high and the release between the transparent image receiving substrate A and the dye receiving layer B after recording is prevented.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a sublimation type thermal transfer image receiving medium used in combination with a thermal transfer recording medium having a transfer layer containing a heat sublimable dye, and particularly to an overhead projector. -(0)
The present invention relates to an image-receiving medium for sublimation thermal transfer that can be used as a transmission document for projection devices such as IP) and photolithography.

[Conventional technology]

The sublimation type thermal transfer recording method uses a thermal transfer recording medium having a transfer layer containing a thermally sublimable dye and an image receiving medium that receives the dye sublimated by thermal printing from the back side of the recording medium, and is capable of excellent halftone recording. In recent years, it has attracted attention as a device that can provide full-color hard copies that are close to color photographs.

Conventionally, the image-receiving medium used in this recording method consists of a dye-receiving layer made of a thermoplastic polyester resin, etc., which exhibits strong dyeability against heat-sublimable dyes, and a release agent, on a substrate (synthetic paper, etc.). The formed one is used. but,
Since polyester resin has low heat resistance, it has the drawback that it fuses with the transfer recording medium (color sheet) during recording and the color fades after storage.

In order to solve these problems, it has been proposed to use vinyl chloride resin alone or in combination with the polyester resin as the resin constituting the dye-receiving layer (Japanese Patent Application Laid-Open No. 1983-1992). -24996, 61-283
No. 595, No. 62-294595, No. 63-5118
1), this vinyl chloride resin can be said to be superior to polyester resins in terms of post-recording releasability, light resistance, storage stability, and the like.

[Problem to be solved by the invention]

However, even when vinyl chloride resin is used as the resin constituting the dye-receiving layer, if the content of the release agent in the dye-receiving layer is low, the adhesion between the transfer substrate and the dye transfer layer may be extremely poor when used as a transfer recording medium. Unless a strong material is used, the transfer layer will be peeled off to the image receiving medium after recording. Conversely, to the extent that the peelability between the transfer recording medium and the image receiving medium is sufficiently improved.

When the amount of release agent in the dye-receiving layer is increased, the adhesion between the substrate in the image-receiving medium and the dye-receiving layer decreases, and the receptor layer is peeled off toward the transfer recording medium after recording. or the transparency of the dye-receiving layer itself decreases (i.e.
This results in a disadvantage that the image quality as a transparent document deteriorates due to the high haze value (haze value).

The present invention solves the above-mentioned problems, has good heat resistance, high adhesive strength between the substrate and the dye-receiving layer, and also provides a bond between the image-receiving medium (dye-receiving M) and the transfer recording medium (dye-receiving layer) after recording. It is an object of the present invention to provide an image receiving medium that has good releasability from the transfer layer (transfer layer), has excellent transparency, and has high image quality.

[Means to solve the problem]

According to the present invention, a VE layer is formed on a transparent substrate, in this order, an intermediate layer mainly made of a polyester resin and an isocyanate compound, and a dye-receiving layer mainly made of a vinyl chloride resin and a mold release agent. An image receiving medium for sublimation type thermal transfer is provided.

That is, the image-receiving medium for sublimation type thermal transfer of the present invention includes an intermediate layer containing a polyester resin and an isocyanate compound as main components between a transparent substrate and a dye-receiving layer containing a vinyl chloride resin and a release agent as main components. Because of this structure, the substrate is not affected by the release agent in the dye-receiving layer, so the adhesive strength between the substrate and the dye-receiving layer is maintained), the image-receiving medium (dye-receiving layer), and the transfer recording medium. (The dye transfer layer) has good releasability.

Next, the present invention will be explained with reference to the drawings.The specific structure and operation of the present invention are as follows.

In FIG. 1, the image receiving medium of the present invention includes a transparent image receiving substrate A,
It consists of a dye-receiving JIIB and an intermediate IC. That is, in the image receiving medium of the present invention, an intermediate layer C mainly made of a polyester resin and an isocyanate compound and a dye receiving layer B mainly made of a vinyl chloride resin and a mold release agent are laminated on a transparent image receiving substrate A in that order. The structure is as follows. Further, 1 indicates a thermal head, and the sublimation transfer recording medium is composed of a heat-resistant layer 2, a transfer substrate 3, and a dye transfer layer 4.

Heat from the thermal head 1 causes the heat sublimable dye to sublimate and diffuse from the dye transfer layer 4 of the sublimation transfer recording medium, and the sublimated dye is transferred to the dye receiving layer B of the image receiving medium. The sublimation dye transferred to the image receiving medium.

The dye is diffused into the dye-dyeable resin forming the dye-receiving layer B and dyed.

As mentioned above, in conventional image-receiving media, it is known that a release agent such as silicone oil is included in the dye-receiving layer B in order to prevent heat fusion during recording and improve releasability after recording. However, when the release agent content is low,
The peelability improvement effect was insufficient, as shown in Figure 2.
After recording, the dye transfer 1'1i14 is peeled off to the dye receiving layer B side.

However, when the content of the release agent is increased in order to improve the releasability, the adhesive force between the transparent image-receiving substrate A and the dye-receiving layer B becomes weaker, and as shown in FIG. Thereafter, a phenomenon occurs in which the dye-receiving layer B is peeled off to the dye-transfer layer 4 side.

However, in the image receiving medium of the present invention, the dye-receiving layer B is mainly composed of a vinyl chloride resin with excellent mold release properties and a mold release agent, and the intermediate layer B is mainly composed of a polyester resin and an isocyanate compound. C is provided between the transparent image-receiving substrate A and the dye-receiving amount B, so that the transparent image-receiving substrate A is dye-receiving/! The adhesive force between the transparent image receiving substrate A and the dye receiving layer B is maintained high without being affected by the release agent in B, and peeling between the transparent image receiving substrate A and the dye receiving layer B is prevented after recording. Moreover, it has excellent heat resistance, light resistance, storage stability, etc.

In the image receiving medium of the present invention having an intermediate fFIc mainly composed of a polyester resin and an isocyanate compound, the peelability between the dye receiving layer B and the dye transfer layer 4 after recording is better than that in the case where no intermediate layer is provided. The amount of mold release agent blended in the dye-receiving JIB can be reduced. In an image-receiving medium for producing a transparent original, it is a matter of course that the substrate has high transparency, but it is also required that the dye-receiving layer has high transparency. The smaller the amount of release agent blended in the dye-receiving layer, the higher the transparency of the dye-receiving layer (lower the degree of haze).

Therefore, the image receiving medium of the present invention has high transparency and thus has excellent image quality.

Examples of the polyester resin used in the intermediate layer C of the present invention include Vylon 200, Vylon 600, and Vylon 290 manufactured by Toyobo Co., Ltd.

Further, as the isocyanate compound, various isocyanate compounds such as tolylene diisocyanate, hexamethylene diisocyanate, hexamethylene diisocyanate, 4,4-diphenylmethane diisocyanate, triphenylmethane triisocyanate, etc. are used,
Furthermore, hexanetriol and the like can be used, and adducts of these and hexanetriol and the like can also be used.

Note that the ratio of the polyester resin to the incyanate compound used is preferably in the range of 0.2 to 2.0 in molar ratio of NGOloH.

Examples of the vinyl chloride resin used in the dye-receiving layer B of the present invention include polyvinyl chloride, vinyl chloride/vinyl acetate copolymer, etc., and the vinyl chloride component is 80%
Preferably, the weight is 2 or more.

Commercially available products include, for example, Union Carbide (7)
VYHH, VYNS, VYHD, VYLF, etc. and Denkabini/Lz1000MT, l00 manufactured by Denki Kagaku Kogyo Co., Ltd.
0A, l000L, 10000, MllEloo, ME
120 etc. are mentioned. Examples of female molding agents include amine-modified silicones, alcohol-modified silicones, polyether-modified silicones, and alkyl aralkyl polyether-modified silicones.

Silicone diamine etc. are used, and the commercially available product is 5F8417.5F8427.5 manufactured by Tomu Silicone@.
) 13749.5F8421.5F8410, and X-22-161 manufactured by Shin-Etsu Chemical @. The ratio of mold release agent to vinyl chloride resin is 0.2 to 20
A weight percent range is preferred. In addition, the dye-receiving layer B and the intermediate layer C can also contain a surfactant, an ultraviolet absorber, an antioxidant, etc. as appropriate.

Furthermore, the transparent substrate A in the image receiving medium of the present invention is as follows:
Polyethylene terephthalate film is most preferably used, but films of polyolefin, acrylic resin, polyvinyl chloride, polyvinylidene chloride, etc. may also be used. The transparency of the substrate is preferably 5% or less in haze value. The thickness of the intermediate layer and the dye-receiving layer provided on the transparent substrate is preferably 0.1 to 10 pII+, particularly preferably 0.1 to 5 μm.

〔Effect of the invention〕

The image-receiving medium for sublimation thermal transfer of the present invention has a structure in which an intermediate layer mainly made of a polyester resin and an incyanate compound and a dye-receiving layer mainly made of a vinyl chloride resin and a mold release agent are laminated in that order on a transparent substrate. Therefore, after recording, the dye transfer layer is not peeled off to the dye receiving layer side, and the dye receiving layer is not peeled off to the dye transfer layer side. The peelability between the medium and the transfer recording medium is good,
Moreover, it has poor heat resistance, light resistance, and storage stability.

Furthermore, since the image receiving medium has high transparency, the image quality is also excellent.

〔Example〕

Next, the present invention will be explained in more detail with reference to Examples. Note that both 2 and parts shown below are based on weight.

Example 1 A mixture having the following composition was sufficiently mixed and dispersed to form a coating liquid for the intermediate layer [liquid B] and a coating liquid for the receptor layer [liquid B]. Made by A.

[Liquid A]

300 parts of toluene 300 parts of methyl ethyl ketone [Liquid B] 280 parts of toluene 280 parts of methyl ethyl ketone Next [
[Liquid A] using a wire bar to make a polyethylene terephthalate film (trade name: Lumirror T) with a thickness of about 100 μm.
60; manufactured by Toshi Corporation) and dried for 1 minute at a drying temperature of 90° C. to form an intermediate layer and a receptor layer each having a thickness of about 3 μm, thereby producing an image receiving medium of the present invention.

On the other hand, as a sublimation transfer recording medium, a 6 μm thick P film with a silicone resin film (about 1 μo+ thickness) as a back layer was used.
A coating liquid for an ink layer (ie, dye transfer layer) [liquid C] having the following formulation was coated on the ET film to a thickness of about 2 coats to obtain a transfer recording medium.

cC liquid] Polyvinyl butyral (trade name BX-1; Sekisui Chemical ■) 7 parts toluene 95 parts methyl ethyl keene 95 parts The obtained transfer recording medium and image receiving medium were mixed with the ink layer of the transfer medium and the dye of the image receiving medium. The recording medium was stacked so that the receiving layer faced it, and an image was recorded from the back side of the transfer recording medium by changing the heating energy using a thermal head. The recording density of the thermal head is 6 tons/h/mm, and the recording output is 0.4
2W/Do! -It was.

Example 2 An image receiving medium of the present invention was produced in the same manner as in Example 1, except that the following [Liquid D] and [E7fk] were used instead of [Liquid A] and [Liquid B], respectively. did.

[Liquid D]

Manufactured by Tan Kogyo) toluene Methyl ethyl ketone [E liquid] 10 copies 300 copies 300 copies Ta.

[F liquid]

G7. Air 28
0 parts Methyl ethyl ketone 280 parts Subsequently, image recording was carried out in the same manner as in Example 1.

Comparative Example 1 An image receiving medium of Comparative Example I was prepared in the same manner as in Example 1, except that the above-mentioned [Liquid B] was used as the receiving layer coating liquid and no intermediate layer was provided, and an image was recorded.

Comparative Example 2 An image receiving medium of Comparative Example 2 was prepared in the same manner as in Example 1, except that the following [Liquid F] was used as the receiving layer coating liquid, and no intermediate layer was provided. One image was recorded.
280 parts methyl ethyl ketone
280 parts Comparative Example 3 An image receiving medium of Comparative Example 3 was prepared in the same manner as in Example 1, except that the following [Liquid G] was used as the intermediate layer coating liquid and the above [Liquid F] was used as the receptor layer coating liquid, and the image receiving medium was prepared in the same manner as in Example 1. [Liquid G] Toluene 300 parts Methyl ethyl ketone 300 parts or more The results of image recording, the degree of haze of the image receiving medium, and the adhesion between the substrate and the receiving layer are shown in Table 1.

Table 1 Note 1) Peelability between dye receiving layer and dye transfer layer after recording 2
) Maximum image sensitivity with Macbeth TD-504 type transmission densitometer 3) Direct reading haze computer IIGM-2DI
Haze degree of the background part of the image receiving medium depending on the mold (Note 4) From the fact that the adhesion between the substrate and the dye receiving layer is greater than the adhesive strength between the substrate and the dye receiving layer, the image receiving medium for sublimation type thermal transfer of the present invention has
It can be seen that there is no fusion of peeled substances from the ink sheet to the image-receiving medium, and there is no fusion of peeled substances from the image-receiving medium to the ink sheet, and since the transparency is high, a transferred image with excellent image quality can be obtained. .

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing the image receiving mechanism of the sublimation type thermal transfer image receiving medium according to the present invention, and also includes a schematic sectional view of the sublimation transfer recording medium. A... Image receiving substrate, B... Dye receiving layer, C... Intermediate layer, 1... Thermal head, 2... Heat resistant layer of transfer recording medium, 3... Transfer substrate of transfer recording medium , 4...Dye transfer layer of transfer recording medium. Further, FIG. 2 is a schematic cross-sectional view of an image receiving medium and a transfer recording medium when a defective peeling due to heat fusion occurs in a conventional image receiving medium due to insufficient release agent in the dye receiving layer. FIG. 3 is a schematic cross-sectional view of an image-receiving medium and a transfer recording medium when a conventional image-receiving medium has a large amount of female type agent in the dye-receiving layer, causing peeling failure due to thermal fusion.

Claims (1)

[Claims] (1) It is characterized by being formed by laminating, in this order, an intermediate layer mainly made of a polyester resin and an isocyanate compound, and a dye-receiving layer mainly made of a vinyl chloride resin and a mold release agent, on a transparent substrate. Image receiving medium for sublimation type thermal transfer.