JPS6262793A - Sheet to be thermally transferred - Google Patents

Abstract

PURPOSE:To obtain preferable writing and sealing properties on a portion on which an acceptance layer is not formed on a sheet surface by forming partly the acceptance layer on a base. CONSTITUTION:A sheet 1 to be thermally transferred is formed by superposing a colorant layer of the sheet and the sheet 1 to contact with an acceptance layer 3 of the sheet 1, heating in response to image information by a thermal head from the support side of the sheet, then separating the support to transfer sublimed dye in the colorant layer to the layer 3 of the sheet 1, thereby transfer recording the image on the sheet 1. The layer 3 receives dye transferred from the sheet at thermal transferring time to partly form a character or an image on the necessary base 2 to be transferred. Since the acceptance layer is not partly fored on the base, excellent writing, sealing and printing properties can be obtained for writing or sealing on the portion in which the acceptance layer is not formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a thermal transfer sheet that is used together with a thermal transfer sheet to perform thermal transfer.

[Conventional technology]

In recent years, thermal transfer has been used as a method for recording characters, images, etc. on cards such as identification cards, cash cards, IC cards, or picture postcards, by heating a thermal transfer sheet with a thermal head whose heat generation is controlled by electrical signals. A thermal transfer recording method is used in which recording is performed by transferring a sublimation dye in a color material layer of a sheet onto a thermal transfer sheet. Conventionally, the thermal transfer sheet used in this thermal transfer recording method is one in which a receptive layer is formed on the entire surface of a paper base material such as synthetic paper or coated paper, or one in which an undercoat layer is formed on the entire surface of the paper base material. It is known that a receptive layer is provided on the entire surface of the receptive layer.

[Problem that the invention seeks to solve]

However, when the heat transfer sheet is used for cards, picture postcards, etc., when writing with a pencil, water-based ink pen, etc., or stamping is performed on the sheet surface, the sheet surface is the receptive layer surface, so the writing properties are poor. There was also the problem that it was not suitable for stamping.

[Means for solving problems]

As a result of intensive research in view of the above-mentioned problems, the present inventors have found that a thermal transfer sheet in which a receptive layer is formed only in the areas where transfer recording is required has good writing ability in the areas on the sheet surface where the receptive layer is not formed. The present inventors have discovered that the sheet is a thermally transferable sheet that has good properties and printing properties, and have completed the present invention.

That is, the thermal transfer sheet of the present invention includes a base material and a receptor layer that receives the dye that migrates from the thermal transfer sheet when heated, in which the receptor layer is partially on the base material. It is characterized by being formed.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows an embodiment of the thermal transfer sheet 1 of the present invention, and the sheet 1 is composed of a base material 2 and a receptor layer 3 partially formed on the base material 2.

As the base material 2, a paper base material such as coated paper, art paper, high-quality paper, or synthetic paper is used.

The receptor layer 3 in the present invention receives the dye transferred from the thermal transfer sheet during thermal transfer, and is partially formed on the base material 2 where characters, images, etc. need to be transferred by the above transfer. . Ink is used to form the receptor layer 3, and examples of this ink include those made of saturated polyester resin, polyurethane resin, polyamide resin, etc., and titanium oxide, titanium oxide,
Extender pigments such as zinc oxide, calcium carbonate, and fine silica powder can also be added and used. Examples of the means for forming the receptive layer 3 include a gravure printing method, a reverse roll coach ink method using a gravure plate, and a screen printing method. , the thickness of the layer 3 is preferably 3 to 10 microns.

Another embodiment of C) 1 of the present invention has a configuration as shown in FIG. That is, the present invention sheet 1
After forming the receptive layer 3 on the entire surface of the base material 2, the N3
By providing the non-receptive layer 4 made of a material different from the material of the receptive layer 3 in the areas above where transfer of characters, images, etc. is unnecessary, that is, in the areas where writing, sealing, etc. are required, the receptive layer 3 can be It has a structure in which it is formed in a portion necessary for transfer.

The material of the non-receptive layer 4 includes acrylic ester,
An ink made by mixing a vehicle such as saturated polyester or vinyl chloride-vinyl acetate copolymer with a material such as titanium oxide, zinc oxide, clay, fine silica powder, or calcium carbonate can be used. . Examples of methods for forming the non-receptive layer 4 include a gravure printing method, a reverse roll coating method using a gravure plate, and a screen printing method. A non-receptive layer 4 is formed on the substrate, and the thickness of the non-receptive layer 4 is preferably 2 to 10 μm.

The thermal transfer sheet 1 of the present invention having the above configuration is as follows:
The color material layer of the thermal transfer sheet consisting of a support material and a color material layer is overlapped with the thermal transfer sheet so that the receiving FJ3 of the thermal transfer sheet 1 is in contact with the thermal transfer sheet, and image information is transferred from the support material side of the thermal transfer sheet using a thermal head or the like. After heating, by peeling off the support material, the sublimation dye in the coloring material layer is transferred to the receiving layer 3 of the thermal transfer sheet 1, and an image is transferred and recorded on the thermal transfer sheet 1.

The present invention will be explained in more detail below by giving specific examples.

Example 1 An ink composition for forming a receptor layer having the following composition was coated on a 150 μ thick synthetic paper by reverse roll coating using a gravure roll partially etched, and dried to obtain a thermal transfer sheet. Ta.

Ink composition for forming a receptor layer Polyester resin: (Vylon 200 manufactured by Toyobo) 1-layer amino-modified silicone resin: (KF-393 manufactured by Shin-Etsu Chemical) 0.03 parts by weight Epoxy-modified silicone resin: (X manufactured by Shin-Etsu Chemical -22-343) 0.03 parts by weight Methyl ethyl ketone/toluene/cyclohexane: (Weight ratio: 4:4:2) 9 parts by weight On the other hand, a 9μ thick polyethylene terephthalate film with heat-resistant treatment on one side was used as a support material. On the opposite side of the heat-resistant treated side of the material, an ink composition for forming a coloring material layer with the following composition was applied by Myabar coating and dried to form a coloring material layer with a thickness of 1μ (solid content coverage 1 g/n ( )
was formed into a thermal transfer sheet.

Ink composition for forming color material layer Disperse dye: (KST-B-136 manufactured by Nippon Kayaku) 0.4 parts by weight Ethyl hydroxyethyl cellulose = (manufactured by Percules) 0.6 parts by weight Methyl ethyl ketone/toluene: (Weight ratio 11) 9 Part by weight: The above thermal transfer sheet and the thermal transfer sheet are stacked so that the coloring material layer and the receptor layer are in contact with each other. After heating with a thermal head, both sheets are peeled off, and the thermal transfer sheet is coated on the partially formed receptor layer of the thermal transfer sheet. The disperse dye in the color material layer of the thermal transfer sheet was transferred.

After the above-mentioned transfer, writing was performed using a pencil or fountain pen on the portion of the heat-transferable sheet where the receiving layer was not provided, and when stamping was performed, both the writing and stamping properties were good.

Example 2 On 110μ thick art paper, an ink composition for forming a receptor layer having the following composition was partially etched and coated by reverse roll coating using a gravure roll.
Dry.

Ink composition for forming receptor layer Polyurethane elastomer: 0.7 parts by weight (Vandenx T-5670 manufactured by Dainippon Ink) Polyvinyl butyral: 0.3 parts by weight (S-LEC BX-1 manufactured by Sekisui Chemical) Methyl ethyl ketone/toluene/ethyl cellosolve: 9 .0 parts by weight (weight ratio 4:4:2) Thermal transfer was performed in the same manner as in Example 1 using the same thermal transfer sheet used in Example 1 and the above-obtained thermal transfer sheet, and then the thermal transfer sheet was When writing and stamping were performed using a pencil or fountain pen on the area where the receptive layer was not provided, both the writing and stamping properties were good.

Example 3 An ink composition for forming a receptive layer having the same composition as in Example 1 was coated entirely on a 110 μm thick synthetic paper by Myabar coating and dried to form a 6 μm thick receptive layer. On the receptive layer, the following ink composition for forming a non-receptive layer is partially etched, printed by gravure printing using a gravure roll, dried to partially form a non-receptive layer, and then a thermal transfer sheet is formed. Obtained.

Ink composition for forming a non-receptive layer Saturated polyester: (Toyobo Byron 290) 100 parts by weight Titanium oxide: (Titan Kogyo KA-10) 30 parts by weight Toluene/methyl ethyl ketone: (Weight ratio 11) 500 parts by weight Example 1
Thermal transfer was performed in the same manner as in Example 1 using the same thermal transfer sheet as used in Example 1 and the thermal transfer sheet obtained above, and then the portions of the thermal transfer sheet where the receptor layer was not provided were used for pencils and fountain pens. When writing and stamping were performed on the paper, both the writing and stamping properties were good.

〔Effect of the invention〕

As explained above, the thermal transfer sheet of the present invention has a base material and a receptor layer that receives dyes transferred from the thermal transfer sheet when heated.
Since the receptive layer is partially formed on the base material, there is an effect that it has excellent writing properties, stamping properties, and printing properties with respect to writing, stamping, etc. in areas where the receiving layer is not formed.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIGS. 1 and 2 are longitudinal sectional views of a thermal transfer sheet. l...Thermal transfer sheet 2...Base material 3...Receptive layer

Claims (2)

[Claims] (1) In a thermal transfer sheet that has a base material and a receptor layer that receives the dye that migrates from the thermal transfer sheet when heated, the receptor layer is partially formed on the base material. Features of thermal transfer sheet. (2) The thermal transfer sheet according to claim 1, wherein a receptive layer is formed entirely on the base material, and a non-receptive layer is partially formed on the receptive layer.