JPH10166793A - Thermal transfer sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a rise of a transfer layer even in the case of printing by a printer by laminating the layer made of resin composition obtained by dispersing non-water soluble thermoplastic resin in water soluble thermoplastic resin via a primer layer made of water soluble or water dispersible thermoplastic resin in a base material sheet-like state. SOLUTION: The thermal transfer sheet comprises a primer layer 3 provided on a base material sheet 2, and a transfer layer 4 provided on the layer 3. The layer 4 is formed of resin composition obtained by dispersing non-water soluble thermoplastic resin 6 in water soluble thermoplastic resin 5. To transfer an image to non-transfer cloth, an image 7 formed of thermal transfer ink is formed on a surface of the layer 4, the surface of the layer 4 is superposed on the non-transfer cloth 8, heated and pressurized from above the sheet 2 by using a heat source 9, and the layer 4 is adhered to the ink image 7. Then, the sheet 3 is released, and washed. After washing, the image 8 is fixed onto the cloth 8. Thus, the base material sheet is brought into close contact with the transfer layer to prevent its rise.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal transfer sheet capable of transferring an image to a transfer-receiving cloth by heating, and more particularly, to a transfer-receiving cloth having excellent printability, washing resistance, flexibility, and texture. A transfer image can be formed,
The present invention relates to a thermal transfer sheet that has good adhesion of a transfer layer to a substrate sheet and that can easily peel off the substrate sheet after thermal transfer.

[0002]

2. Description of the Related Art Generally, a thermal transfer sheet has a laminated structure in which a transfer layer containing a thermoplastic resin is provided on a base sheet. On the transfer layer surface of the thermal transfer sheet, an image (design, pattern, character, etc.) is formed by means such as printing. To transfer using a thermal transfer sheet, the transfer layer surface on which the image has been formed is brought into contact with a cloth to be transferred such as clothing or a handkerchief, and heating and pressing may be performed from above the base sheet surface using an iron or a hot press. . After the transfer, the base sheet is peeled from the transfer layer.

Conventionally, Japanese Patent Publication No. 51-23838 discloses a thermal transfer sheet using a water-soluble or alkali-soluble cellulose derivative or vinyl polymer for a transfer layer. A pattern to be transferred is printed on the transfer layer surface with an ink containing a dye or pigment. After transferring the transfer layer and the ink pattern to the transfer cloth, fix the dye and pigment in the ink, then dissolve and remove the transfer layer, wash and dry, and the pattern with only the dye and pigment remains on the transfer cloth. . Although this thermal transfer sheet can transfer a design that does not cause discomfort on a transfer-receiving cloth, it does not have sufficient printability such as print density and washing resistance.

Japanese Utility Model Registration No. 30018811 proposes a thermal transfer sheet in which a hydrophilic printing paste mainly composed of an acrylic resin emulsion is applied to one surface of a substrate sheet. A pattern is printed on the application surface of the printing paste with an aqueous ink. In this thermal transfer sheet, although the aqueous ink receptivity of the transfer layer composed of the printing paste is good, the printing paste is plasticized and adheres to the fabric at the time of thermal transfer. Not enough.

[0005] JP-A-2-305689, JP-A-Hei-4
JP-A-187495 and JP-A-5-162469 propose transfer sheets in which a transfer layer containing a thermoplastic resin as a main component is formed on a base sheet. On the transfer layer surface, press and heat the fusion type thermal transfer ink ribbon,
Melt transfer the ink image. When an image is transferred to a cloth to be transferred, the transfer layer made of a thermoplastic resin is also transferred to the thermal transfer sheet. Therefore, a sticking mark is conspicuous, the flexibility of the cloth is impaired, and a feeling of strangeness is caused. When dried, the thermoplastic resin detaches and adheres to places other than the transfer section and other clothing, or the image part also detaches and the image density decreases,
When ironing, there is a drawback such that the release must be performed with a release paper in between so that the thermoplastic resin does not melt and adhere to the iron.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to form a transfer image on a transfer-receiving cloth which is excellent in printability, washing resistance, flexibility, texture, etc., and to transfer the image to a substrate sheet. An object of the present invention is to provide a thermal transfer sheet having good adhesion of layers and capable of easily peeling a substrate sheet after thermal transfer. More specifically, an object of the present invention is to provide a thermal transfer sheet in which the adhesiveness of a transfer layer to a base sheet is improved, no floating occurs during printing, and thermal transfer can be easily performed. It is in. The present inventors have conducted intensive studies to overcome the problems of the prior art, and as a result, on a substrate sheet, a resin composition comprising a water-soluble thermoplastic resin and a water-insoluble thermoplastic resin dispersed therein. Having conceived of a thermal transfer sheet having a transfer layer formed thereon, a patent application was previously filed (Japanese Patent Application No. 8-79500).

This thermal transfer sheet has good ink receptivity of the transfer layer, and can easily print a beautiful T-shirt by printing images such as characters and patterns on a word processor and transferring it to a cloth using an iron. Since a transfer cloth such as a handkerchief can be obtained, it is extremely convenient. After the transfer to the transfer-receiving cloth, if the resin is washed with water, the excess resin portion is washed away, so that the sticking marks are not conspicuous, the flexibility of the cloth is maintained without a feeling of stiffness, and the transfer-receiving cloth having a good texture is obtained.
The image from the word processor is firmly fixed to the cloth by the water-insoluble resin at the time of thermal transfer, so that the image has good washing resistance and does not lose the image portion even after repeated drying with a dryer. It is also possible to directly iron the transferred cloth.

However, some word processor printers on the market use high-curvature (small-diameter) transport rolls. When printing, the thermal transfer sheet is bent along such rolls. Further, when pressed by a pressure roll, the transfer layer sometimes slightly floats from the base sheet. As a result, troubles such as the part where the transfer layer floats become white due to the air layer and damage the commercial value, the transfer layer becomes easy to peel off from the base sheet, and the thermal transfer sheet wraps around the pressure roll of the printer. There was a risk of occurrence. Further, in this thermal transfer sheet, the transfer layer was sometimes partially peeled off over time.

In order to improve the adhesion between the substrate sheet and the transfer layer, it is conceivable to provide a primer layer having excellent adhesion to each layer, but it is difficult to peel off the substrate sheet after thermal transfer. If it becomes difficult to remove the primer layer or excess resin by washing with water after the transfer, the original transferability of the thermal transfer sheet is impaired. Therefore, the present inventors have conducted further research.As a result, if a water-soluble or water-dispersible thermoplastic resin is used for the primer layer, the transfer layer does not float even when printing with a word processor printer. Further, it has been found that a thermal transfer sheet having good transferability can be obtained. The present invention has been completed based on these findings.

[0010]

According to the present invention, a water-insoluble thermoplastic resin is introduced into a water-soluble thermoplastic resin through a primer layer made of a water-soluble or water-dispersible thermoplastic resin on a base sheet. A thermal transfer sheet characterized in that a transfer layer made of a resin composition in which a plastic resin is dispersed is laminated.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, a thermal transfer sheet 1 of the present invention has a primer layer 3 on a base sheet 2.
Is provided, and the transfer layer 4 is provided thereon. As shown in FIG. 2, the transfer layer 4 is formed from a resin composition in which a water-insoluble thermoplastic resin 6 is dispersed in a water-soluble thermoplastic resin 5. In order to transfer an image onto a cloth to be transferred using the thermal transfer sheet 1, as shown in FIG. 3, the image is transferred onto the surface of the transfer layer 4 of the thermal transfer sheet 1 by using a word processor having a printer of a thermal fusion transfer type. Then, a desired image 7 made of a thermal transfer ink is formed in a mirror image pattern, and then, as shown in FIG. Heat and pressure are applied from above the sheet 2 using a heat source 9 such as an iron or a hot press, so that the transfer layer 4
And the ink image 7 are adhered.

Next, when the base sheet 2 of the thermal transfer sheet 1 is peeled off, the ink image 7, the transfer layer 4 and the primer layer 3 remain on the transfer cloth 8 as shown in FIG. When this is washed with water, the water-soluble thermoplastic resin 5 in the primer layer 3 and the transfer layer is washed out and removed, but at the same time, the non-water-soluble thermoplastic resin 6 dispersed in the water-soluble thermoplastic resin 5 is removed.
Is removed. However, the water-insoluble thermoplastic resin 6
Is melted at the time of thermal transfer and adheres to the ink image 7 and the cloth to be transferred. Therefore, after washing with water, the ink image 7 is firmly fixed on the cloth to be transferred 8 by the remaining water-insoluble thermoplastic resin 6, as shown in FIG. If necessary, the washing step can be omitted, and the transferred cloth can be used in the state shown in FIG. In this case, the binder layer 3 and the transfer layer 4 are removed by washing, and the cloth to be transferred 8 shown in FIG. 6 is obtained.

When the thermal transfer sheet of the present invention is printed by a printer of a word processor, for example, as shown in FIG. 7, the thermal transfer sheet 1 is an ink image formed by a printing section comprising a fusion type thermal transfer ink ribbon 10 and a thermal head 11. Is melt-transferred and then conveyed in such a manner that it can be bent between the conveyance roll 12 and the pressure roll 13. If the thermal transfer sheet does not have a primer layer,
At the time of printing, as shown in FIG. 8, air 14 enters between the transfer layer 4 and the base sheet 2, and the transfer layer 4 may slightly float from the base sheet 2. If the transfer layer floats around the thermal transfer sheet, the transport roll 12 and the pressure roll 1
3, the floating portion of the transfer layer further expands,
In some cases, it may be wound around a pressure roll. On the other hand, the thermal transfer sheet of the present invention has excellent adhesion between the base sheet and the transfer layer, and does not cause floating.

Base Sheet The base sheet used in the present invention includes polyester,
Plastics film such as polycarbonate; high-quality paper, art paper, coated paper, glassine paper, imitation paper, cellulose fiber paper such as water-soluble paper, but has a function of holding a transfer layer made of a resin composition, In addition, the sheet is not limited to the above-described base sheet as long as the sheet is heat-resistant to heating by an iron, a hot press, or the like. The base sheet may be subjected to a surface treatment such as a peeling treatment and a mat treatment as necessary. The thickness of the base sheet is not particularly limited, but is usually about 50 to 200 μm from the viewpoint of the strength of the base material and the transportability in the printer.

[0015] In the primer layer present invention, as the water-soluble or water-dispersible thermoplastic resin used in the primer layer is generally, 5 to 40 ° C.
It does not have crystallinity in the temperature range of about and is flexible. It is melted or softened at the heating temperature (120-180 ° C.) during thermal transfer, melted and integrated with the transfer layer, and transferred during melting or cooling. It is preferable that the adhesive strength with the layer is higher than the adhesive strength with the base sheet. The water-soluble or water-dispersible thermoplastic resin has a glass transition temperature of 5
Even if it is in the range of 〜40 ° C., any material can be used as long as it does not actually crystallize in this temperature range and does not float or peel off from the substrate sheet even when bent considerably.

When a water-soluble or water-dispersible thermoplastic resin which crystallizes at a temperature in the range of about 5 to 40 ° C. is used as the primer layer, even if the adhesion to the substrate sheet is good immediately after the coating, the time is too short. With the lapse of time, crystallization proceeds, and the adhesion to the base sheet is likely to be reduced. Even a crystalline water-soluble or water-dispersible thermoplastic resin can be used as a primer as long as the above-mentioned conditions can be satisfied by adding an appropriate plasticizer. But,
Considering the separation and seepage of the plasticizer over time,
It is desirable to use an amorphous thermoplastic resin.

The water-soluble or water-dispersible thermoplastic resin used as the primer layer has a glass transition temperature of 60.
It is preferable that the material has a characteristic of a melting point of 180 ° C. or less, a melting point of 180 ° C. or less, and a melt viscosity (180 ° C., shear rate of 100 / sec) of 1,000 to 100,000 poise, but is not limited thereto. Specific resins for forming the primer layer include polyvinyl alcohol, polyester, polyamide, and cellulose derivatives (such as hydroxypropyl cellulose). Among these, polyvinyl alcohol is particularly preferred.

Transfer Layer In the present invention, a transfer layer is formed from a resin composition in which a water-insoluble thermoplastic resin is dispersed in a water-soluble thermoplastic resin. (Water-soluble thermoplastic resin) Examples of the water-soluble thermoplastic resin used in the present invention include natural polymers such as pullulan, methylcellulose, ethylcellulose, hydroxypropylcellulose and other cellulose derivatives; and synthetic polymers such as sodium polyacrylate and polystyrene. Examples thereof include acrylamide, polyvinyl alcohol, polyvinylpyrrolidone, polyethylene oxide, polyester, and polydioxolan, and particularly preferred are polyvinyl alcohol, polyethylene oxide, and polyester.

The water-soluble thermoplastic resin includes, as a melt viscosity reducing agent, polyhydric alcohols such as glycerin, trimethylolpropane, sorbitol and mannitol, and modified products thereof; ethylene glycol, diethylene glycol,
Glycols such as triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, and polypropylene glycol, and modified products thereof; surfactants such as sorbitan fatty acid esters; maleic acid, and modified products thereof are added. be able to.

The water-soluble thermoplastic resin component used in the present invention is not limited to the above resins, but has a melting point or softening point of 200 ° C. or less, preferably 30 to 150 ° C.
Any water-soluble resin at a temperature of ° C. can be suitably used, and depending on the required characteristics, they can be used alone or in combination of two or more. The water-soluble thermoplastic resin used for the transfer layer is 5 to prevent the thermal transfer sheet from blocking during storage or use.
Those exhibiting crystallinity in a temperature range of 40 ° C. are preferred. When the water-soluble thermoplastic resin is crystalline, the adhesion to the substrate sheet is reduced, but in the present invention, since the primer layer is provided, the blocking resistance is improved while increasing the adhesion to the substrate sheet. Can be increased.

(Water-insoluble thermoplastic resin) Examples of the water-insoluble thermoplastic resin used in the present invention include polyolefins such as polyethylene, polypropylene and ethylene-vinyl acetate copolymer; Plastic resins; thermoplastic elastomers and the like. The water-insoluble thermoplastic resin used in the present invention,
It is not limited to the above-mentioned resins, and the melting point or softening point can be suitably used as long as it is a water-insoluble thermoplastic resin having a melting point or softening point of 200 ° C or less, preferably 30 to 150 ° C. They can be used alone or in combination of two or more. The water-insoluble thermoplastic resin may be in any shape such as a pellet, a powder, a solution, or the like, but may be used as fine particles or an emulsion in order to enhance dispersibility.

(Resin Composition for Transfer Layer) The proportion of each resin component in the resin composition forming the transfer layer is such that the water-soluble thermoplastic resin is usually 55.0 to 99.5% by weight, preferably 60%. 0.0 to 97.0% by weight, more preferably 70.0 to
95.0% by weight, and the water-insoluble thermoplastic resin is usually 0.5 to 45.0% by weight, preferably 3.0 to 40.0% by weight.
%, More preferably 5.0 to 30.0% by weight.

If the blending ratio of the water-insoluble thermoplastic resin is too low, the solidity and washing resistance deteriorate, whereas if it is too high, the water-insoluble thermoplastic resin is contained in the matrix of the water-soluble thermoplastic resin. It becomes difficult to finely disperse the non-transfer cloth, and the removal operation of the transfer layer by washing with water becomes difficult, or the residual ratio of the water-insoluble thermoplastic resin becomes too high, and the flexibility and texture of the non-transfer cloth are impaired. And the like.

To prepare a resin composition in which a water-insoluble thermoplastic resin is dispersed in a water-soluble thermoplastic resin, a method of dissolving or dispersing each of these resin components in water or an organic solvent and mixing them, There are methods such as melt blending. When water or an organic solvent is used, it is dried after being applied on the base sheet. By these methods, a resin composition in which a water-insoluble thermoplastic resin is dispersed in a water-soluble thermoplastic resin matrix can be obtained.

Various modifiers and additives can be added to the resin composition of the present invention, if necessary, as long as the object of the present invention is not impaired. Specific examples of these compounding agents include, for example, pigments, coloring agents such as dyes, tackifiers such as rosin and terpene, calcium carbonate, silica, inorganic fillers such as talc, organic fillers, plasticizers, Antioxidants, ultraviolet absorbers and the like can be mentioned. These compounding agents can be added in necessary amounts as appropriate.

The thickness of the transfer layer containing the resin composition of the present invention is not particularly limited.
１００100 μm, preferably about 20-80 μm.
If the thickness of the transfer layer is too thin, the adhesiveness to the fiber of the cloth to be transferred is reduced at the time of heat transfer, and the robustness and washing resistance are likely to be impaired.On the other hand, if it is too thick, the production method is limited, There is a possibility that inconveniences such as an increase in manufacturing cost may occur. The image forming surface of the transfer layer is used to prevent blocking between thermal transfer sheets and improve transportability in the printer for image formation, or to maintain ink acceptability and maintain ink ribbon runnability. Can be subjected to a concavo-convex treatment such as a mat treatment.

Thermal Transfer Sheet In order to manufacture the thermal transfer sheet of the present invention, first, a water-soluble or water-dispersible thermoplastic resin used for the primer layer is dissolved or dispersed in water or an organic solvent, and this liquid is dispersed in a base sheet. Apply to A water-soluble or water-dispersible thermoplastic resin may be melt-coated on the base sheet. The thickness of the primer layer is usually about 1 μm to 10 μm, preferably 1 to 5 μm. As a method of forming the transfer layer, a water-soluble thermoplastic resin and a non-water-soluble thermoplastic resin and various compounding agents as desired, dissolved or dispersed in water or an organic solvent to the base sheet provided with a primer layer Examples of the method include a method of coating, a method of melting and extruding a sheet from a T-die and coating the substrate sheet, and any other method that does not impair the performance of the resin composition is limited to a specific method. is not.

The thermal transfer sheet of the present invention has good printability, and can be easily and clearly printed on the transfer layer surface by using a word processor equipped with a generally used thermal transfer type printer. The thermal transfer sheet of the present invention is thermally transferred to a transfer-receiving cloth, and after peeling the base sheet,
When washed with water, the aqueous layer thermoplastic resin components in the primer layer and the transfer layer are removed, so that an image in which sticking marks are not conspicuous and flexibility is not lost can be obtained. By washing with water, many of the water-insoluble thermoplastic resin components dispersed in the transfer layer are also removed. After the washing, substantially only a part of the water-insoluble thermoplastic resin component remains on the transfer-receiving cloth, but the remaining water-insoluble thermoplastic resin component forms an image on the transfer-receiving cloth. The adhesion is increased, the robustness is high,
An image with good washing resistance is obtained. That is, the water-insoluble thermoplastic resin present on the surface portion of the transfer layer melts during thermal transfer and adheres to the ink image and the non-transfer cloth.

As the cloth to be transferred, any desired cloth such as a shirt, underwear, and cloth can be used. The thermal transfer sheet of the present invention can be printed (characters, pictures, etc.) by a printer attached to a general word processor, and can be easily transferred to a transfer cloth with a household iron or the like. After the transfer, by washing or washing with water, the excess resin portion is dissolved and removed, while the printed portion is firmly fixed without falling off, so that it is possible to obtain a very soft and good cloth. .

[0030]

The present invention will be described more specifically below with reference to examples and comparative examples. In the following examples, parts represent parts by weight. Example 1 (Water-soluble thermoplastic resin solution for primer layer) Polyvinyl alcohol (1 *) 5 parts Water 95 parts The above solution was applied to a 100 μm-thick polyethylene terephthalate film (untreated PET film) with a thickness of 5 μm.
(During drying) to obtain a transfer substrate sheet provided with a primer layer. (Resin composition for transfer layer) Water-soluble saturated polyester resin (2 *) 100 parts Water-soluble saturated polyester resin (3 *) 20 parts EVA emulsion (4 *) 51.4 parts Water 70 parts Primer layer Was applied so as to have a thickness of 55 μm (when dried). This sheet was cut into A4 size sheets to form a thermal transfer sheet for a word processor. Arbitrary characters were printed as mirror image characters on the transfer layer surface of the thus obtained thermal transfer sheet using a word processor equipped with a commercially available thermal transfer printer. The print density was high and the ink receptivity was excellent. No lifting of the transfer layer from the base sheet was observed. The printed thermal transfer sheet was heated and pressurized on a cotton fabric for about 20 seconds by setting the temperature at an intermediate temperature with a household iron. When the sheet was cooled and the substrate sheet was peeled off, it was cleanly peeled off from the primer layer. After the transfer, the primer layer and the transfer layer were washed away with water to remove them. As a result, a clear transferred cloth having flexibility and washing resistance was obtained. That is, there was no uncomfortable feeling in the flexibility and texture of the transferred cloth. Further, even after normal washing (including drying using a dryer) was performed continuously 20 times, a high printing density was maintained.

Example 2 (Water-soluble thermoplastic resin solution for primer layer) 5 parts of water-dispersible thermoplastic resin (5 *) 95 parts of water Except that this solution was used, the same procedure as in Example 1 was carried out.
A substrate sheet having a 1 μm-thick primer layer was obtained. (Resin composition for transfer layer) Polyvinyl alcohol (6 *) 100 parts Polyethylene glycol (7 *) 200 parts Low-density polyethylene fine particles (* 8) 100 parts Water 100 parts Same as Example 1 using the above composition. 45μ in thickness
Thus, a thermal transfer sheet having a transfer layer of m was obtained. Printing was performed in the same manner using a word processor printer, but no peeling of the sheet edge or floating of the transfer layer was observed. The printed thermal transfer sheet was heated and pressurized on a cotton fabric for about 20 seconds by setting the temperature at an intermediate temperature with a household iron.
When the sheet was cooled and the substrate sheet was peeled off, it was cleanly peeled off from the primer layer. After the transfer, the primer layer and the transfer layer were washed away with water to remove them. As a result, a clear transferred cloth having flexibility and washing resistance was obtained. That is, there was no uncomfortable feeling in the flexibility and texture of the transferred cloth. Further, even after normal washing (including drying using a dryer) was performed continuously 20 times, a high printing density was maintained.

Example 3 (Water-soluble thermoplastic resin solution for primer layer) 4.5 parts of polyvinylpyrrolidone (9 *) 0.5 parts of glycerin 95 parts of water The above solution was coated to a thickness of 3 μm. 75 μmP
Coating was performed on an ET film base sheet to obtain a base sheet having a primer layer. (Resin composition for transfer layer) Polyethylene oxide (10 *) 100 parts Polyethylene glycol (11 *) 150 parts Thermoplastic elastomer (12 *) 62.5 parts Water 75 parts Using the above composition, Similarly, thickness 50μ
Thus, a thermal transfer sheet having a transfer layer of m was obtained. Printing was performed in the same manner using a word processor printer, but no peeling of the sheet edge or floating of the transfer layer was observed. The printed thermal transfer sheet was heated and pressurized on a cotton fabric for about 20 seconds by setting the temperature at an intermediate temperature with a household iron.
When the sheet was cooled and the substrate sheet was peeled off, it was cleanly peeled off from the primer layer. After the transfer, the primer layer and the transfer layer were washed away with water to remove them. As a result, a clear transferred cloth having flexibility and washing resistance was obtained. That is, there was no uncomfortable feeling in the flexibility and texture of the transferred cloth. Further, even after normal washing (including drying using a dryer) was performed continuously 20 times, a high printing density was maintained.

[Comparative Example 1] In Example 1, a thermal transfer sheet was obtained by applying the resin composition for a transfer layer as it was on a base sheet without providing a primer layer. The resulting thermal transfer sheet was indistinguishable from the appearance with the primer layer. When this was printed with a word processor printer, no lifting or peeling was seen at the printed portion, but the portion hit by the pressure roll slightly floated and appeared white due to the air layer.

[Comparative Example 2] In Example 2, the thermal transfer sheet was obtained by directly applying the resin composition for a transfer layer to a base sheet without providing a primer layer. The resulting thermal transfer sheet was indistinguishable from the appearance with the primer layer. When the sheet was cut by the pinch, the transfer layer was partially peeled around the sheet.
When the partially peeled transfer layer was pulled with a finger, the transfer layer was peeled while tearing. Therefore, when the partially transferred thermal transfer sheet is put into a printer of a word processor and printed, it may be wound around a pressure roll.

Comparative Example 3 A thermal transfer sheet was obtained in the same manner as in Example 3 except that the primer layer was not provided and the base sheet was coated. When printing on the A4 size thermal transfer sheet obtained immediately after coating with a word processor printer, there was no problem, but when I tried to print on the thermal transfer sheet after storage for 2 weeks, a part of the transfer layer on the periphery of the sheet was transferred. There was a floating part. When a sheet with a non-floating transfer layer in the peripheral area was selected and printed with a word processor printer, the area where the pressure roll contacted was floating and looked white.

The components used in these Examples and Comparative Examples are as follows. (* 1) PVA SMR-30M, manufactured by Shin-Etsu Kagaku Co., Ltd. (* 2) Polyester WR-930, manufactured by Nippon Synthetic Chemical Industry Co., Ltd. (* 3) Polyester WR-901, Nippon Synthetic Chemical Industry Co., Ltd. (* 4) Sumika Flex, Sumitomo Chemical Co., Ltd. (* 5) AQ14000, Eastman Chemical Co., Ltd.
(* 6) Baogen PP-15, Daiichi Kogyo Seiyaku Co., Ltd. (* 7) PEG4000N, Sanyo Chemical Industry Co., Ltd. (* 8) Flow beads LE-1080, Sumitomo Seika Co., Ltd.
(* 9) V. P. K-30, G .; A. F. (* 10) PEO-1, manufactured by Sumitomo Seika Co., Ltd. (* 11) PEG4000N, manufactured by Sanyo Chemical Co., Ltd. (* 12) Chemipearl V-200, manufactured by Mitsui Petrochemical Industries, Ltd.

[0037]

According to the present invention, there is provided a thermal transfer sheet capable of forming a transferred image excellent in printability, washing resistance, flexibility, texture and the like. Furthermore, the thermal transfer sheet having the primer layer of the present invention does not cause the transfer layer to float or peel off during storage and printing, and also allows the transfer to be performed cleanly and reliably, thereby greatly improving the stability of the product. Improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a thermal transfer sheet of the present invention.

FIG. 2 is a cross-sectional view of the thermal transfer sheet of the present invention.

FIG. 3 is a view showing a transfer layer surface of the thermal transfer sheet of the present invention;
FIG. 4 is a cross-sectional view when an image is printed by a thermal transfer method.

FIG. 4 is an explanatory view showing a method of transferring a transfer layer of a thermal transfer sheet of the present invention onto a transfer-receiving cloth.

FIG. 5 is a cross-sectional view when the substrate sheet is peeled off after transferring the thermal transfer sheet of the present invention to a cloth to be transferred.

FIG. 6 is a cross-sectional view of the thermal transfer sheet of the present invention after being transferred to a transfer-receiving cloth, the base sheet is peeled off, and then washed with water to dissolve and remove the transfer layer.

FIG. 7 is an explanatory diagram when printing is performed by a printer of a word processor.

FIG. 8 is an explanatory diagram when a part of the transfer layer floats.

[Explanation of symbols]

 1: Thermal transfer sheet 2: Base sheet 3: Primer layer 4: Transfer layer 5: Water-soluble thermoplastic resin 6: Non-water-soluble thermoplastic resin particles 7: Transfer image 8: Transferred cloth 9: Heat source such as iron 10: Thermal transfer ink ribbon 11: Thermal head 12: Transport roll 13: Pressure roll 14: Floating part containing air

 ──────────────────────────────────────────────────続 き Continued on front page (72) Inventor Kazutoshi Haraguchi 2-3-3 Sekiguchi, Bunkyo-ku, Tokyo Nichiban Co., Ltd.

Claims (2)

[Claims] 1. A resin composition in which a water-insoluble thermoplastic resin is dispersed in a water-soluble thermoplastic resin through a primer layer made of a water-soluble or water-dispersible thermoplastic resin on a base sheet. A thermal transfer sheet, wherein a transfer layer comprising: 2. The thermal transfer sheet according to claim 1, wherein the primer layer is a layer made of polyvinyl alcohol.