JPH0422686A - Sublimation type thermal transfer recording sheet - Google Patents

Abstract

PURPOSE:To prevent the fusion of a transfer layer to receiving paper at the time of transfer, to impart excellent gradation properties even in a high density hue or in high speed transfer and to reduce transfer noise by adding a predetermined wt. of a perfluoroalkyl type acrylic oligomer to the transfer layer. CONSTITUTION:A transfer layer is formed on the surface of a base material in 0.1-2mum thickness and constituted of a sublimable dye, a binder and a perfluoroalkyl type acrylic oligomer. The sublimable dye is contained in an amount of 0.1-10 pts.wt. per 100 pts.wt. of the binder. As the sublimable dye, an azo type, anthraquinone type or spiropyrane type disperse dye and a cation dye can be used. The binder is selected from ones not obstructing the sublimation transfer of the dye to receiving paper by a dry binder film and having good affinity to the sublimable dye and heat resistance. The perfluoroalkyl type acrylic oligomer is an acrylic oligomer having a perfluoroalkyl chain and pref. contains a hydrophilic or oleophilic group in order to enhance the compatibility with a solvent.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to sublimation, in which a sublimable dye is sublimated and transferred by heating of a thermal transfer recording device such as a thermal printer, a thermal typewriter, or a laser to form an image on a receiving paper. This invention relates to a type heat-sensitive transfer recording sheet.

[Prior Art] In this type of transfer recording sheet, a transfer layer containing a sublimable dye and a binder as main components is formed on one side of a base material, and a heat-resistant layer is formed on the back side of the base material. The binder contained in this transfer layer is selected from materials whose dry film does not inhibit the sublimation transfer of the dye to the receiving paper and which is heat resistant to high sublimation temperatures. Specifically, as a binder, a polymer composition having a melting point or softening point of 100° C. or higher is used, and particularly suitable ones include acrylic resin, methacrylic resin, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyvinyl acetal, and polyamide. , polyvinyl alcohol, polycarbonate, polysulfone, polyether sulfone, cellulose resin, etc.
994).

[Problems to be Solved by the Invention] In the sublimation transfer recording system, the amount of sublimation of the sublimable dye is adjusted depending on the amount of thermal energy applied to the transfer body, thereby making it possible to reproduce gradations. However, in reality, when the amount of thermal energy increases, the above-mentioned binder melts at the same time as the sublimable dye sublimates, and the transfer layer tends to fuse to the receiving paper, making it impossible to reproduce gradations in high-density tones. This tendency becomes remarkable when a receiving layer made of a composition with a low glass transition point or a sticky composition is formed on the surface of the receiving paper.

If the amount of binder is decreased and the amount of dye is increased in order to prevent the transfer layer from fusing to the receiving paper and increase the density of the transferred image, the problem is that the gradation deteriorates and transfer noise increases. There was a point.

The purpose of the present invention is to prevent the transfer layer from fusing to the receiving paper during transfer.
Excellent gradation even in high-density color tones or high-speed transfer,
Another object of the present invention is to provide a sublimation type heat-sensitive transfer recording sheet with low transfer noise.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a transfer body for sublimation transfer recording in which a transfer layer containing a sublimable dye and a binder is formed on one side of a base material. The layer contains 1 to 50 parts by weight of perfluoroalkyl acrylic oligomer based on 100 parts by weight of the binder.

This will be explained in detail below.

As the base material of the present invention, plastic film, condenser paper, thin paper such as glassine paper is used. Examples of the plastic film include polyethylene terephthalate film, polyimide film, polysulfone film, polystyrene film, polycarbonate film, vinyl chloride film, etc., and those having a thickness of about 1 to 25 μm can be used. It is preferable to previously provide a heat-resistant layer such as a silicone resin on the back surface of this base material, that is, the surface facing the thermal head, since sticking (fusion) can be prevented.

The transfer layer of the present invention is formed on the surface of the substrate to a thickness of 0.1 to 2 μm, and is composed of a sublimable dye, a binder, and a perfluoroalkyl acrylic oligomer. The sublimable dye is contained in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the binder. As the sublimable dye, azo-based, anthraquinone-based, spiropyran-based disperse dyes and cationic dyes can be used.

The binder is selected from those whose dry film does not inhibit the sublimation transfer of the dye to the receiving paper, which has good affinity with the sublimable dye, and which is heat resistant. Specifically, the binder described in Japanese Unexamined Patent Publication No. 59-14994 mentioned above can be used. Among the polyvinyl acetals, preferred are polyvinyl formal, polyvinyl acetal, polyvinyl bental, polyvinyl hexal, polyvinyl hexal, and the like. These resins are disclosed in Japanese Patent Application Laid-Open No. 59-14994.
Compared to the binder described in the publication, it has a higher degree of polymerization, a higher molecular weight, a higher glass transition point, and is better able to hold sublimable dyes. These binders are described in detail in the specification of a sublimation type thermal transfer sheet for which the present applicant has applied for a patent (Japanese Patent Application No. 1-234183).

A perfluoroalkyl acrylic oligomer has a perfluoroalkyl chain in the acrylic oligomer, and in addition to the perfluoroalkyl chain, polyethylene oxide groups, carboxylic acid groups,
Those containing hydrophilic groups such as lithium and potassium sulfonates, and lipophilic groups such as phosphoric acid esters and sulfonic acid amides are preferred. Specifically, the product names are "Megafac F-171, Megafac F-173, Megafac F-177, Megafac F-1,83, Megafac F-184J (manufactured by Dainippon Ink and Chemicals). Commercially available. Perfluoroalkyl acrylic oligomer is binder 1.
1 to 50 parts by weight per 00 parts by weight. If it is less than 1 part by weight, the effect of preventing fusion will be poor, and if it exceeds 50 parts by weight, the transfer density will decrease, and when gravure coating the ink, the coating performance will deteriorate, so the content must be within the above range. It is.

The above-mentioned transfer layer is prepared by preparing an ink by dissolving or finely dispersing a sublimable dye, a binder, and a perfluoroalkyl acrylic oligomer in an organic solvent, and then applying this ink to a printing method such as gravure coating, wire bar coating, or reverse coating. Alternatively, it can be applied to one side of a substrate using a spray coating method and dried to form a uniform thin film on the substrate.

[Function] In the transfer layer of a transfer recording sheet having such a structure, fluorine, which is a constituent molecule of the perfluoroalkyl-based acrylic oligomer, is oriented on the surface of the transfer layer. The transfer layer is less likely to be fused to the receiving paper even in the color tones of , making it possible to reproduce images with gradation.

[Effects of the Invention] As described above, according to the present invention, the perfluoroalkyl acrylic oligomer acts as a release agent and prevents the transfer layer from fusing to the receiving paper, so noise during transfer is reduced. Even with small, high-density color tones or high-speed transfer, uniform transferred images with excellent gradation can be obtained.

[Example] Next, the present invention will be explained in detail. The “departments” mentioned below are “
Parts by weight.

<Example 1> A polyethylene terephthalate film with a thickness of 6 μm was selected as the base material, and after forming a slippery heat-resistant layer mainly composed of silicone resin on the back side of this film, the surface of this film was coated with the composition shown below. The ink was applied at a coating amount of 1.0 g/lri'' by a wire bar coating method, and then dried with warm air to form a transfer layer.

・Sublimable dye Ceres Blue GN (henyl) (
C, 1, 5olvent Blue 63)
4.7 parts Binder polyvinyl formal resin 4.3 parts Perfluoroalkyl acrylic oligomer mechanism F-177 (Dainippon Ink & Chemicals ■) 005 parts
Solvent Toluene 40.0 parts Methyl ethyl ketone 50.0 parts On the other hand, using synthetic paper as a base sheet, a coating solution having the composition shown below was coated on one side at a coating amount of 4.5 g/m2 at 100°C. A receiving paper with a receiving layer formed thereon was obtained by drying for a minute.

・Polyester resin Vylon200 (Toyobo, glass transition point 67℃)
15.3 parts Amino-modified silicone oil
15 parts methyl ethyl ketone to
o, og The above sublimation type heat-sensitive transfer recording sheet and the above-mentioned receiving paper were superimposed on the transfer layer and the receiving layer and loaded into a heat-sensitive transfer recording device.

<Example 2> Foron Rubine 5E-GFL as sublimable dye
(Santo') (C1, Disperse Red
73) A dye-sublimation heat-sensitive transfer recording sheet was prepared in the same manner as in Example 1, except that 2.2 parts and 2.0 parts of Meka7y Fuku F-173 (Dainippon 4Dr Chemical Industry ■) were used to replace the perfluoroalkyl acrylic oligomer. I got it.

The receiving paper of Example 1 was superimposed on this transfer recording sheet, and the transfer layer and the receiving layer were placed on top of each other and loaded into a thermal transfer recording device.

<Example 3> Cares Yellow GRN (A
'inyl) (C, I.

5olvent Yellow 29) 3.4 parts, perfluoroalkyl acrylic oligomer mechanically
A sublimation type heat-sensitive transfer recording sheet was obtained in the same manner as in Example 1 except that 0.8 part of t-tri F-183 (Dainippon 4y + Kagaku Kogyo ■) was used.

The receiving paper of Example 1 was superimposed on this transfer recording sheet, and the transfer layer and the receiving layer were placed on top of each other and loaded into a thermal transfer recording device.

<Example 4> Vylon20 polyester resin was used in the ink of the receiving layer.
A receiving paper was obtained in the same manner as in Example 1 except that Vylon 560, which has a glass transition point (7° C.) lower than 0, was used.

This receiving paper was superimposed on the transfer recording sheet of Example 1 and loaded into a thermal transfer recording device.

Comparative Example 1 A transfer recording sheet was prepared in the same manner as in Example 1 except that the perfluoroalkyl acrylic oligomer was not used.
The receiving paper of Example 1 was superimposed on this transfer recording sheet, and the transfer layer and the receiving layer were placed on top of each other and loaded into a thermal transfer recording device.

<Comparative Example 2> A transfer recording sheet was prepared in the same manner as in Example 2 except that the perfluoroalkyl acrylic oligomer was not used.
The receiving paper of Example 1 was superimposed on this transfer recording sheet, and the transfer layer and the receiving layer were placed on top of each other and loaded into a thermal transfer recording device.

Comparative Example 3 A transfer recording sheet was prepared in the same manner as in Example 3 except that the perfluoroalkyl acrylic oligomer was not used.
The receiving paper of Example 1 was superimposed on this transfer recording sheet, and the transfer layer and the receiving layer were placed on top of each other and loaded into a thermal transfer recording device.

<Comparative Example 4> A transfer recording sheet was prepared in the same manner as in Example 1 except that the perfluoroalkyl acrylic oligomer was not used.
The receiving paper of Example 4 was superimposed on this transfer recording sheet, and the transfer layer and the receiving layer were placed on top of each other and loaded into a thermal transfer recording device.

<Transfer Results> In Comparative Examples 1 to 3, a voltage of IOV was applied to the thermal head, and the transfer layer was fused to the receiving layer of the receiving paper after only 2.0 milliseconds of printing. Further, in Comparative Example 4, the transfer layer started to fuse in 0.5 milliseconds at the same voltage. Comparative example 1 due to the above fusion
Only images with poor gradation were obtained on the receiving paper No. 4.

On the other hand, in Examples 1 to 4, the transfer layer did not fuse to the receiving layer of the receiving paper even when the same voltage of 1OV as in the comparative example was applied to the thermal head and printing was performed for 4.0 milliseconds. Further, even when a voltage of 17 V was applied to the thermal head and printing was performed for 6.3 milliseconds, the transfer layer did not fuse to the receiving layer of the receiving paper. In particular, in Examples 1 to 4, the peeling sound during transfer during sublimation transfer of the dye was extremely small, and uniform transferred images with excellent gradation were obtained on all receiving papers. This revealed that the perfluoroalkyl acrylic oligomer of the present invention has an excellent effect of preventing fusion.

Claims (1)

[Scope of Claims] A sublimation type heat-sensitive transfer recording sheet in which a transfer layer containing a sublimable dye and a binder is formed on one side of a base material, wherein the transfer layer contains 1 to 5 parts by weight of the binder based on 100 parts by weight of the binder.
A sublimation type heat-sensitive transfer recording sheet comprising 0 parts by weight of perfluoroalkyl acrylic oligomer.