JPS63221091A - Thermal transfer acceptive sheet - Google Patents

Abstract

PURPOSE:To prevent the fusion of transfer sheet and an acceptive sheet due to repeated printing, by coating a base material with a acceptive layer forming coating solution containing a dyeable thermoplastic resin having active hydrogen, a fluorocarbon resin having active hydrogen and a crosslinking agent to both resins to cure the coating layer. CONSTITUTION:A dyeable thermoplastic resin shown sufficient dyeing affinity to the sublimable dye contained in a transfer sheet when the transfer sheet and areceiving sheet are superposed to perform printing under heating and has active hydrogen such as a hydroxyl group, a carboxyl group or an amino group. A fluorocarbon resin having active hydrogen has a hydroxyl group, a carboxyl group, amino group or the like and pref. has an alcoholic hydroxyl group or a carboxyl group. The use ratio of the thermoplastic resin, the fluorocarbon resin and a crosslinking agent of a receiving layer forming coating solution is about 1:0.1-0.005:0.1-0.01pts.wt. By applying the acceptive layer forming coating solution to a base material to heat the formed acceptive layer, the thermoplastic resin and the fluorocarbon resin are crosslinked to form the acceptive layer composed of a crosslinked resin product on the base material.

Description

Detailed Description of the Invention [Prior Art] The present invention is used in combination with a transfer sheet having a transfer layer containing a sublimable or vaporizable dye, and receives the sublimated or vaporized dye by heating the transfer sheet. This invention relates to a receiving sheet for thermal transfer.

[Prior art]

In recent years, there has been an increasing demand for obtaining photographic images directly from electrical signals, and various attempts have been made. One such attempt is to project an image on a CRT and photograph it using silver halide film, but if the silver halide film is an instant film, it has the disadvantage of high running costs, and When the silver halide film is a 35 mm film, there is a drawback that it is not instantaneous because development processing is required after photographing. As yet another method,
Impact ribbon methods and inkjet methods have also been proposed, but the former has the disadvantage of poor image quality.
The latter method requires image processing, so it has the disadvantage that it is difficult to easily obtain a photograph-like image.

In order to overcome these drawbacks, a thermal transfer method has been proposed in which a thermal transfer sheet provided with a sublimable disperse dye layer that transfers when heated is used in combination with a receptor sheet, and thermal printing is performed using a thermal head. There is. This method has attracted attention because an image having continuous gradation can be obtained from a television signal through simple processing, and the equipment used therein is not complicated.

However, since the heating time by the thermal head is usually extremely short, there is a problem in that the dye on the thermal transfer sheet is not sufficiently transferred onto the receiving sheet. Therefore, in order to solve the above-mentioned problem, as a result of studies, it was proposed to provide a receiving layer made of a thermoplastic resin that is dyeable with sublimable or vaporizable dyes on the receiving sheet. However, in such a configuration, since the heating temperature of the thermal head is a high temperature of 200° C. or more, the resin used in the thermal transfer sheet and the receiving sheet is softened by heat, and the thermal transfer sheet and the receiving sheet are fused together. A new problem arose.

To solve this new problem, JP-A-61-
102293, in which a low energy surface layer made of silicone resin or fluororesin is provided on a resin layer made of thermoplastic resin, and JP-A-102293,
There are receptor layers described in Japanese Patent No. 27290 that contain solid waxes, surfactants, or silicone oils, but these receptor layers have an effect on the dyeability of the thermoplastic resin due to the added components. In addition to the drawback of deterioration, when thermal printing is repeated with a thermal head, these added components migrate from the receiving layer to the transfer layer, causing a shortage of these added components in the receiving layer, so that the transfer sheet and receiving sheet are It has the disadvantage that it can be fused again.

〔the purpose〕

The present invention provides a thermal transfer receptor sheet that improves the above-mentioned drawbacks, and that prevents the transfer sheet and the receptor sheet from fusing even if the transfer sheet and the receptor sheet are overlapped and repeatedly printed, and that a high-density image can be obtained. The purpose is to provide

〔composition〕

According to the present invention, the resin is used in combination with a transfer sheet having a transfer layer containing a sublimable or vaporizable dye, and is made of a resin that is dyeable with respect to the dye sublimed or vaporized by heating the transfer sheet. A receptor sheet having a receptor layer, wherein the resin is made of a resin crosslinked product obtained by condensing a dyeable thermoplastic resin having active hydrogen and a fluororesin having active hydrogen with a crosslinking agent via the active group. A thermal transfer receiving sheet is provided.

The thermal transfer receptor sheet of the present invention is produced by applying a receptor layer forming coating liquid containing a dyeable thermoplastic resin having active hydrogen, a fluororesin having active hydrogen, and a crosslinking agent for both resins onto a base material, and then applying the resin to the base material. It can be obtained by curing and forming a receptor layer made of a crosslinked resin on a base material.

The dyeable thermoplastic resin used in the coating solution for forming the receptor layer is made by laminating a transfer sheet and a receptor sheet.

When printing by heating, it exhibits sufficient dyeability for the sublimable dye contained in the transfer sheet, and.

It is a resin having active hydrogen such as a hydroxyl group, a carboxyl group, or an amino group, and preferably a resin having an alcoholic hydroxyl group or a carboxyl group. Examples of such materials include saturated polyester resins, poly(meth)acrylic ester resins, and partially saponified polyvinyl acetate. Preferred are saturated polyester resins and acrylic polyol resins.

The fluororesin having active hydrogen has a hydroxyl group, a carboxyl group, an amino group, etc., preferably a fluororesin having an alcoholic hydroxyl group or a carboxyl group, and particularly preferably a fluororesin having an alcoholic hydroxyl group or a carboxyl group, and particularly preferably a perfluoroalkyl (meth)acrylate or a perfluoroolefin. at least one selected from among, hydroxyalkyl (meth)acrylate,
It is a copolymer consisting of at least one selected from vinyl hydroxyalkyl ether and (meth)acrylic acid.

Specific examples of these resins include Lumiflon LF100 manufactured by Asahi Glass Co., Ltd. Lumiflon LF200, Lumiflon LF300, Lumiflon LF400, Surflon S-3
81 and Modiper F100 manufactured by NOF Corporation. Examples include Modivar F200.

As a crosslinking agent, it has been known that it reacts with active hydrogen.
There are various kinds of compounds including polyisocyanate compounds, epoxy compounds, polymethylol compounds, etc., and these compounds can be used alone or in combination of two or more kinds.

Furthermore, in addition to the above-mentioned components, catalysts and reaction promoters such as hexamethylenetetramine and ammonium chloride aqueous solution may be included. These compositions can be mixed without a solvent or
Alternatively, it is dissolved in a commonly known solvent such as toluene or methyl ethyl ketone to form a receptor layer forming coating liquid, and the coating liquid is applied onto a substrate using a method such as a wire bar to prepare a receptor sheet.

The ratio of the thermoplastic resin, fluororesin, and crosslinking agent in the receptor layer forming coating liquid is 0.1 to 0.00 parts by weight of the fluororesin to 1 part by weight of the thermoplastic resin, 0.1 to 0.0 parts by weight of the crosslinking agent. .0
The amount of the fluororesin is preferably about 1 part by weight. Particularly when the fluororesin has a perfluoroalkyl group, the amount of the fluororesin may be 0.05 to 0.01 part by weight per 1 part by weight of the thermoplastic resin.

The substrate to which the receptor layer forming coating liquid is applied may be plain paper, coated paper with improved surface smoothness, synthetic paper based on a plastic film such as polypropylene, or plastic film such as polyethylene terephthalate film. The receptive layer forming coating liquid is applied to these substrates using a method such as a wire bar, blade, reverse roll, air knife, etc., and the amount of adhesion of the receptive layer after drying is 1.
The amount should be approximately 20 g/-, particularly preferably 5 to 10 g/-.

Next, the thermoplastic resin and the fluororesin are crosslinked by heating the receptor layer formed above. Heating conditions vary depending on the composition of the receptor layer forming coating solution, but are usually 100°C.
Heating for about 10 minutes is sufficient. The resin crosslinked product thus formed typically exhibits a softening point of 150 to 250°C.

To perform thermal transfer using the receiving sheet of the present invention, the transfer layer of the transfer sheet and the receiving layer of the receiving sheet are brought into contact with each other from the side of the transfer sheet that does not have the transfer layer, or from the opposite side or both sides. Just heat it.

By this heating, the dye contained in the transfer layer sublimates or vaporizes, and the surface of the resin forming the receiving layer of the receiving sheet is softened, and the vaporized dye enters the softened resin and is dyed.

As the sublimable or vaporizable dye, conventionally known dyes such as disperse dyes, oil-soluble dyes, acid dyes, mordant dyes, vat dyes, and basic dyes can be used.

[Effects] The thermal transfer receptor sheet of the present invention prevents the fluororesin from transferring to the transfer layer even if it is overlapped with a thermal transfer sheet and repeatedly printed, so the transfer sheet and the receptor sheet do not fuse together. , and gives a high-density image.

〔Example〕

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

Reference Example [Preparation of thermal transfer sheet (1) for cyan color] The following composition was coated on one side of a 6 μm thick polyester film using a wire bar and dried so that the amount of adhesion after drying was Ig/rrr.

Kayaset Blue FR (manufactured by Nippon Kayaku Co., Ltd.): 5 parts Ethyl cellulose = 5 parts Toluene 245 parts Methyl ethyl ketone: 45 parts In addition, 3 parts silicone resin and 0.3 parts catalyst on the back.

The amount of adhesion after drying a composition consisting of 97 parts of toluene is 0.
A thermal transfer sheet (1) for cyan color was prepared by coating and drying at a concentration of 1 g/%.

[Preparation of thermal transfer sheet for magenta color (2)] A thermal transfer sheet for magenta color (2) was prepared in the same manner except that Kayaset Red B (manufactured by Nippon Kayaku Co., Ltd.) was used instead of Kayaset Blue FR in the thermal transfer sheet. Created.

[Preparation of thermal transfer sheet for yellow color (3)] A thermal transfer sheet for yellow color (3) was prepared in the same manner except that Kayaset Yellow A-G (manufactured by Nippon Kayaku Co., Ltd.) was used instead of Kayaset Blue FH in the thermal transfer sheet. )It was created.

Example 1 Composition (A) 150μ-thick synthetic paper (Yubo FP manufactured by Tamago Yuka Synthetic Paper Co., Ltd.
The above composition (A) was applied to G-150) using a wire bar so that the amount of adhesion after drying was 5 g/rrr, and heated at 100° C. for 10 minutes to prepare a receiving sheet.

Example 2 Composition (B) Toluene = 30 parts A receiving sheet was prepared in the same manner as in Example 1, except that the composition CB) was used instead of the composition of Example 1.

Example 3 Composition (C) Saturated polyester resin (same as Example 1): 10 parts Polyisocyanate (same as Example 1): 0.2 parts Instead of the composition of Example 1, the above composition [C] A receiving sheet was prepared in the same manner as in Example 1 except that the following was used.

Example 4 Composition (D) Hexamethylenetetramine: 0.05 part 1
0% ammonium chloride aqueous solution: 0.01 part The above composition CD) was applied to a 230 μm thick high-quality paper (basis weight 200 g/rrr) using a wire bar so that the amount of adhesion after drying was Log/resistant. A receiving sheet was prepared by heating at 100° C. for 10 minutes.

Comparative Example 1 A comparative receiving sheet was prepared in the same manner as in Example 1 except that the polyisocyanate was omitted.

Comparative example 2 In Example 1, instead of Surflon S-381.

A receiving sheet for comparison was prepared in the same manner except that a non-hardening type Surflon S5-382U (manufactured by Glass Co., Ltd.) was used.

Comparative Example 3 A comparative receiving sheet was prepared in the same manner as in Example 1, except that non-curable polyacrylic acid ethyl ester was used instead of the saturated polyester resin.

Comparative Example 4 A comparative receiving sheet was prepared in the same manner as in Example 1, except that amino-modified silicone oil (KF-860, manufactured by Shin-Etsu Chemical Co., Ltd.) was used instead of the perfluoroalkyl acrylate resin.

Comparative Example 5 A receiving sheet for comparison was prepared in the same manner as in Comparative Example 4, except that the amount of amino-modified silicone oil was increased to 1 part.

Using the thermal transfer sheet and thermal transfer receiving sheet prepared above 1, an applied voltage of 4 was applied using a 6 dot/mu thermal head.
00mw/dot, pulse time 0.5-8. Ormse
Recording was performed under the conditions of c, the degree of fusion was visually determined, and the image density was measured using a Macbeth densitometer. As a result, as shown in Table 1, when the thermal transfer receiving sheet of the present invention and the thermal transfer sheet (1) for cyan color were used (transfer test A), the fusion between the thermal transfer sheet and the thermal transfer receiving sheet was When three types of thermal transfer sheets, cyan transfer sheet (1), magenta transfer sheet (2), and yellow thermal transfer sheet (3), were used in sequence (transfer test B)
), no fusion occurred between the thermal transfer sheet and the thermal transfer receiving sheet, but when the thermal transfer receiving sheet of the comparative example was used, fusion occurred, and the thermal transfer sheet and the thermal transfer receiving sheet came into close contact. It became difficult to peel off.

Claims (1)

[Claims] (1) Used in combination with a transfer sheet having a transfer layer containing a sublimable or vaporizable dye, and having a receiving layer made of a resin that is dyeable to the dye sublimated or vaporized by heating the transfer sheet. The receptor sheet is characterized in that the resin is made of a resin crosslinked product in which a dyeable thermoplastic resin having active hydrogen and a fluororesin having active hydrogen are condensed with a crosslinking agent via the active group. Receptive sheet for thermal transfer.