JPH02112992A - Heat transfer image receiving sheet - Google Patents

Abstract

PURPOSE:To obtain excellent various rigidities and particularly excellent indoor discoloring resistance and dark place discoloring resistance in a fresh image having sufficient density to be formed by forming a dye receiving layer of resin containing specific compound. CONSTITUTION:A base material, and a dye receiving layer formed on at least one side face of the base material are provided, and the layer is made of resin containing compound represented by a formula I. The resin for forming the layer particularly desirably includes vinyl resin and polyester resin. In order to further enhance discoloring resistance and particularly indoor discoloring resistance and dark place discoloring resistance of a transfer image formed on the layer, oxidation preventive agent represented by the formula I is added into the layer. The of used specific oxidation preventive agent is not particularly limited, but desirably 0.5 to 10 pts.wt. per 100 pts.wt. of resin for forming the layer.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a thermal transfer image-receiving sheet, and more specifically, it has excellent color density, sharpness, and various fastness properties, particularly excellent indoor and fading resistance and dark place resistance. The purpose of the present invention is to provide a thermal transfer image-receiving sheet on which a recorded image can be formed.

(Prior art) Various thermal transfer methods have been known in the past, among which a sublimation dye is used as a recording agent, stiffness is supported on a base sheet such as paper to form a thermal transfer sheet, and the dye is dyed with a sublimation dye. Apply 1 to a transferable material, such as polyester woven fabric, etc.
A transfer method is used in which thermal energy is applied in a pattern from the back side of a thermal transfer sheet to transfer the male monopoly dye to the transfer material.

Recently, methods have been proposed for forming various full-color images on paper or plastic film using a type of thermal transfer method.

In this case, the printer's thermal head is used as a heating means, and by heating in an extremely short time, three or four colors can be printed.
A large number of colored dots are transferred to a transfer material, and a full-color image of an original is reproduced using the multicolored colored dots.

The images formed in this way are very clear and have excellent transparency because of the coloring materials or dyes used, so the images obtained have excellent intermediate color reproducibility and gradation, and are It is possible to form high-quality images that are similar to images produced by offset printing or gravure printing, and comparable to full-color photographic images.

(The problem that the invention is trying to solve) However,
Since the resulting images are formed from dyes, they generally have inferior light fastness compared to images using pigments, and there is a problem in that the images fade or discolor quickly when exposed to direct sunlight. The problem of the light fastness of the dyestuffs can be solved to some extent by adding an ultraviolet absorber or antioxidant II to the dye-receiving layer of the transfer material. However, the problem of discoloration and fading occurs not only due to direct sunlight, but also due to indoor light, or when the contents of albums, cases, books, etc. are not exposed to direct light. However, these problems of indoor discoloration and dark discoloration cannot be solved by using ultraviolet absorbers or antioxidants in the film, and both are important issues to be solved.

Therefore, an object of the present invention is to provide a clear image with sufficient density in a thermal transfer method using a sublimable dye, and to provide the formed image with excellent fastness properties, particularly excellent indoor fading resistance and An object of the present invention is to provide a thermal transfer image-receiving sheet that exhibits no dark place resistance or fading resistance.

(Means for solving problems) Point [-1] is achieved by the following present invention.

That is, the present invention comprises a base sheet and a dye-receiving layer formed on at least one surface of the base sheet, and the dye-receiving layer is formed by combining a compound represented by the following structural formula (I) with 4T. This is a thermal transfer image-receiving sheet characterized by being made of resin.

(Function) By incorporating a specific compound into the receptor layer of a thermal transfer image-receiving sheet, a sufficiently dense and clear image can be obtained in the thermal transfer method using Fg dye, and the formed image can be easily returned. It is possible to provide a thermal transfer image-receiving sheet that exhibits various fastness properties, particularly excellent resistance to indoor discoloration and fading and resistance to discoloration and fading in the dark.

(Preferred Embodiments) Next, the present invention will be described in more detail by citing preferred embodiments.

The thermal transfer image-receiving sheet of the present invention comprises a sorted base material and a dye-receiving layer provided at least in part thereon.

The base sheet used in the present invention includes synthetic paper (polyolefin-based, polystyrene-based, etc.), paper, art paper, coated paper, cast coated paper, wallpaper, backing paper, synthetic resin- or emulsion-impregnated paper, synthetic Rubber latex-impregnated paper, synthetic resin-loaded paper, paperboard, cellulose fiber paper, polyolefin, polyvinyl chloride, polyethylene terephthalate, polystyrene, polymethacrylate, polycarbonate, and other various plastic films or sheets can be used. A white opaque film made by adding a white pigment or a filler to a synthetic resin or a foamed sheet may also be used, but there are no particular limitations.

Also, the length of the base sheet is L! A laminate consisting of a combination of , can also be used. Typical laminates include cellulose fiber paper and synthetic paper, or cellulose fiber paper and plastic film or sheet. The thickness of these base sheets may be arbitrary, and typically has a thickness of about 10 to 300 μm, for example.

When the base sheet as described above has poor adhesion to the receptor layer formed on its surface, it is preferable to subject the surface thereof to a brimer treatment or a corona discharge treatment.

The receptor layer formed on the surface of the base sheet is for receiving the sublimable dye transferred from the thermal transfer sheet and maintaining the formed image.

Examples of the resin for forming the dye-receiving layer include polyolefin resins such as polypropylene, halogenated polymers such as polyvinyl chloride and polyvinylidene chloride, vinyl polymers such as polyvinyl acetate and polyacrylic ester,
Polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polystyrene resins, polyamide resins, extraction combination resins of olefins such as ethylene and propylene and other vinyl monomers, ionomers, cellulose resins such as cellulose diacetate, polycarbonates Particularly preferred are vinyl resins and polyester resins.

The thermal transfer image-receiving sheet of the present invention is prepared by dissolving or dispersing in an appropriate organic solvent or water a resin as described above with necessary additives added to at least one of the base sheets. A dye-receiving layer is obtained by applying and drying the dispersion by a forming means such as a gravure printing method, a screen printing method, or a reverse roll coating method using a gravure plate.

- When forming the receptor layer, fillers and pigments such as titanium oxide, zinc oxide, kaolin clay, calcium carbonate, and finely powdered silica are used to improve the whiteness of the receptor layer and further enhance the clarity of the transferred image. It is possible to add an agent.

In the present invention, the transfer image formed on the receiving layer has resistance to change and fading,
In particular, in order to further improve the resistance to indoor discoloration and fading and the resistance to dark place discoloration, an antioxidant represented by the following structural formula (I) is added to the receptor layer.

is 1,3,5-tris(4-tert-butyl-3-
Hydroxy-2,6-dimethylhensyl)isocyanurate, for example, can be produced by hand under the trade name of (:VANOX-1790 (Sun Chemical Co.); on the other hand, 1,3.
5-tris(3,5-tert-butyl-4-hydroxy-hensyl)isocyanurate, e.g.
It can be prepared manually under the trade name IRG8NX-3114 (Chiha Geigy) and used in the present invention.

These antioxidants can be used alone or as a mixture, and other ultraviolet absorbers and antioxidants can also be used in combination.

The amount of the above-mentioned specific antioxidant used is not particularly limited, but
It is preferably used in an amount of 0.5 to 10 parts by weight, preferably 3 to 10 parts by weight, per tooabt part of the resin forming the dye-receiving layer. If the amount used is too small, it will be difficult to obtain the desired effect of the present invention, while if the amount used is too large, it will be uneconomical.

The dye-receiving layer formed as described above may have any thickness, but numerically from 1 to 50 .mu.m. Also, such a dye-receiving layer is preferably a continuous coating, or may be formed as a discontinuous coating using a resin emulsion or resin dispersion.

Basically, the thermal transfer image-receiving sheet of the present invention can be used satisfactorily even with the structure as shown in -F, or the receiving layer of the present invention has a mold releasability in order to provide good mold releasability from the thermal transfer sheet. Preferably, it contains an agent.

Preferred mold retarding agents include silicone oil, phosphate ester surfactants, fluorine surfactants, etc. Silicone oil is preferred.

The above silicone oils include epoxy-modified, alkyl-modified, amino-modified, carboxyl-modified, alcohol-modified, fluorine-modified, alkyl aralkyl polyether-modified,
Modified silicone oils such as epoxy/polyether modified and polyether modified silicone oils are desirable.

One or more types of mold release agents may be used. The amount of the release agent added is preferably 1 to 20 parts by weight per 100 parts by weight of the receptor layer forming resin. If the addition amount does not fall within this range, problems such as fusion between the thermal transfer sheet and the receptor layer or a decrease in printing sensitivity may occur. Such a release agent may account for about 0.5 to 30% by weight of the dye-receiving layer.

Furthermore, the image receiving sheet of the present invention can be applied to various uses such as thermal transfer sheet carts capable of thermal transfer recording of 120T, transmissive manuscript preparation sheets, etc. by appropriately selecting the base material sheet.

Furthermore, in the image receiving sheet of the present invention, a cushion layer can be provided between the base sheet and the receiving layer if necessary, and by providing such a cushion layer, image information can be improved with less noise during printing. Corresponding images can be transferred and recorded with good reproducibility.

Examples of the material constituting the cushion layer include polyurethane resin, acrylic resin, polyethylene resin, butadiene rubber, and epoxy resin. The thickness of the cushion layer is preferably about 2 to 20 μm.

Moreover, a slippery layer can also be provided on the back surface of the base sheet.

Examples of the material for the slipping layer include methacrylate resins such as methyl methacrylate or corresponding acrylate resins, and vinyl resins such as vinyl chloride-vinyl acetate copolymer.

Furthermore, it is also possible to provide a detection mark on the image receiving sheet. The detection mark is very convenient when positioning the thermal transfer sheet and the image receiving sheet, and for example, a detection mark that can be detected by a phototube detection device can be provided by printing on the back side of the base sheet.

The thermal transfer sheet used when performing thermal transfer using the thermal transfer image-receiving sheet of the present invention as described above is one in which a dye layer containing a liphatic dye is provided on paper or a polyester film, and is a conventional thermal transfer sheet. Both can be used as they are in the present invention.

In addition, any conventionally known means for applying thermal energy during thermal transfer can be used, such as thermal printers (for example,
By controlling the recording time using a recording device such as 100-100), the intended purpose can be sufficiently achieved by applying thermal energy of about 5 to 100 mJ/mrn'.

(Effects) According to the present invention as described above, by including a specific compound in the receptor layer of the heat-transferring ear image-receiving sheet, stomach! I! A thermal transfer method that uses color dyes to produce clear images with sufficient density, and in addition, the images formed have excellent fastness properties, especially excellent resistance to indoor changes and fading and resistance to dark changes and fading. An image receiving sheet can be provided.

(Example) Next, the present invention will be explained in more detail by giving examples and comparative examples. In the text, parts or percentages are based on weight unless otherwise specified.

Example 1 Synthetic paper (Yupoto RG-150, thickness 150 μm, manufactured by Tamago Yuka Co., Ltd.) was used as a base sheet, and a coating liquid having the following composition was applied to one side of the paper using a bar coater at a rate of 5.0 g/dry when dried.
The thermal transfer image-receiving sheet of the present invention was obtained by coating and drying at a ratio of m''.

Polyester (Vylon 600, manufactured by Toyobo) 4.0 parts Vinyl chloride/vinyl acetate copolymer (#1000A, manufactured by Denki Kagaku Kogyo) 6.0 parts Amino-modified silicone (X-22-3050 (:, manufactured by Shin-Etsu Chemical) >062 parts Epoxy-modified silicone (X-22-3000E, manufactured by ShinM Chemical Industry Co., Ltd.) 0.2 parts Antioxidant (
CYANOX-1790, manufactured by Sun Chemical) 03 parts methyl ethyl ketone/toluene (weight ratio l/1) 89.
Part 3 Example 2 In place of the antioxidant in Example 1, an antioxidant (I
A thermal transfer image-receiving sheet of the present invention was obtained in the same manner as in Example 1, except that RGANOX-3114 (manufactured by Ciba Geigy) 04 parts was used and the solvent was changed to 89.2 parts.

Example 3 In place of the antioxidant in Example 2, an antioxidant 1F agent (
A thermal transfer image-receiving sheet of the present invention was obtained in the same manner as in Example 2, except that 0.2 part of CYANOX-1790 (manufactured by Sun Chemical) and 0.2 part of an antioxidant (IRGANOX-3114, manufactured by Ciba Geigy) were used.

Comparative Example 1 No detergent was used for the antioxidant 1 in Example 1, but a solvent was used at 89%.
．． A thermal transfer image-receiving sheet of a comparative example was obtained in the same manner as in Example 1 except that the amount was changed to 6 parts.

Comparative Example 2 Comparative example 2 was carried out in the same manner as in Example 1, except that 0.3 part of an antioxidant represented by the structural formula (Sumilizer BIIT, manufactured by Sumitomo Chemical @) was used in place of the antioxidant in Example 1. A thermal transfer image-receiving sheet was obtained.

Comparative Example 3 Thermal transfer image reception of a comparative example was carried out in the same manner as in Example 1 except that 03 parts of an antioxidant represented by the structural formula (IRGANOX-1010, manufactured by Ciba Geigy) was used in place of the antioxidant in Example 1. Got a sheet.

On the other hand, an ink composition for forming a dye-carrying layer having the following composition was prepared, and a dry coating amount of 1.0 g/rn' was applied to a 6 μm thick polyethylene terephthalate film whose back side was heat-resistant treated.
A thermal transfer sheet was obtained by coating and drying with a wire bar so as to obtain a heat transfer sheet.

C, 1, Disbirds Yellow 201 5.5 parts Polyvinyl butyral resin (S-LEC [lX-1, manufactured by Mikki Kagaku) 4.5 parts Methyl ethyl ketone/toluene (weight ratio 1/)) 90.0 parts The above thermal transfer sheet and the above The thermal transfer image-receiving sheets of the present invention and the comparative example were stacked on each other with their respective dye layers and dye-receiving surfaces facing each other, and a thermal transfer image-receiving sheet of the present invention and a comparative example were stacked together using a thermal dye sublimation transfer printer (vy-so,
(Newly manufactured by Hitachi), recording was performed with a thermal head from the back side of the thermal transfer sheet at a printing energy of 90 mJ/mrn', and the results shown in Table 1 below were obtained. The storage stability of the prints was compared based on the fading rate after the recorded images were kept in a dry state at 70° C. for 24 hours. The fading rate is a value calculated using the following formula.

0.D. = Reflection density of printed matter immediately after printing 0, D, =
Reflection density of printed matter after storage at 70°C for 24 hours 9I''-1 momme Example 1 Example 2 Example 3 Comparative example 1 Comparative example 2 Comparative example 3 12° 11° 32° 28. 29°1°C above' 1 person 7frp-shi 8 IIJ M
I&〒', p-'.

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Claims (3)

[Claims] (1) Consists of a base sheet and a dye-receiving layer formed on at least one surface of the base sheet, and the dye-receiving layer is composed of a resin containing a compound represented by the following structural formula (I). A thermal transfer image-receiving sheet with special features. ▲There are mathematical formulas, chemical formulas, tables, etc.▼(I) (R in the formula is ▲There are mathematical formulas, chemical formulas, tables, etc.▼ or ▲
There are mathematical formulas, chemical formulas, tables, etc.▼. ) (2) The thermal transfer image-receiving sheet according to claim 1, wherein the content of the compound of structural formula (I) is 0.5 to 10 parts by weight per 100 parts by weight of the resin forming the receptor layer. (3) The thermal transfer image-receiving sheet according to claim 1, wherein the dye-receiving layer further contains a release agent.