JP5050163B2 - Adhesive transfer sheet - Google Patents

Description

The present invention relates to an adhesive transfer sheet used for attaching images to various adherends.

Various transfer sheets include organic solvent transfer type, thermal transfer type, adhesive transfer type, and water transfer type. The adhesive transfer sheet is preferably used when it is desired to avoid the use of an organic solvent or when heat cannot be applied.
In recent years, there is a tendency to prefer images that are rich in individuality rather than uniform images produced by mass production. However, the conventional adhesive transfer sheet tends to be a uniform image because many sheets of the same image are printed on the print layer by screen printing or the like to create a sheet. Further, screen printing requires a screen printing plate (stencil plate) and a plate having the number of colors necessary for the image. For example, in the case of three-color printing, three plates are five in five-color printing. A version is required. For this reason, it takes a lot of time and cost to create one image, which is not suitable for producing a small amount of image.

  In addition, it was necessary to maintain the texture of leather products and surfaces with fine irregularities due to wood grain and other decorations. For this purpose, it was necessary to use a soft film for the support of the pressure-sensitive adhesive sheet and make the support very thin with a thickness of 10 μm or less. However, it is possible to print on a pressure sensitive adhesive sheet of a hard film such as a PET film with a thick support, but it can be printed with various types of printers, but to a pressure sensitive adhesive sheet that is a soft ultrathin film of 10 μm or less. The image formation was extremely difficult.

Japanese Patent Application No. 2007-338655 Japanese Patent Application No. 2007-338656

The present invention has been made to solve the above problems, and it has been possible to easily form an image on an adhesive sheet, which is a very thin film having a soft thickness of 10 μm or less, which has been difficult until now. An object of the present invention is to obtain an ultrathin adhesive transfer sheet that can easily and precisely print and transfer individual images, not single images, even in units of one sheet.

An intermediate transfer sheet having at least a release layer and an image receiving layer on a base film, a water release sheet having a water-soluble release layer on paper and a hot melt adhesive layer thereon, and an adhesive sheet having an adhesive layer on a support After the image is printed on the intermediate transfer sheet with a thermal transfer printer, the image is re-transferred by superimposing the image-receiving layer surface of the intermediate transfer sheet and the hot-melt adhesive layer surface of the water release sheet and then thermocompression bonding. A pressure-sensitive adhesive transfer sheet is formed by forming a sheet and superposing the release layer surface of the water transfer sheet on which the image has been transferred and the support surface of the pressure-sensitive adhesive sheet, and then thermocompression bonding. (First invention)
The pressure-sensitive adhesive transfer sheet according to the first invention is a film having a thickness of 2 to 10 μm. (Second invention)

The pressure-sensitive adhesive transfer sheet of the present invention makes it possible to use a soft, ultra-thin film as a support, and keeps the texture of the adherend as it is, following a leather product with irregularities on the surface of the adherend. can do. Also, by immersing the adhesive transfer sheet affixed to the adherend in water, the water-soluble glue layer is moistened and the paper can be peeled off with a light peeling force. Adhesion transfer from the adherend by peeling the paper There is an advantage that there is no problem that the entire sheet is peeled off.

Intermediate transfer sheet Image formation by thermal transfer onto an intermediate transfer sheet Water release sheet Re-transfer of image from intermediate transfer sheet to water release sheet by heat roller Adhesive sheet Thermocompression bonding of water transfer sheet and adhesive sheet Adhesion of adhesive transfer sheet to adherend Paper peeling

The present invention is described in detail below.
Procedure 1. First, an intermediate transfer sheet shown in FIG. 1 having at least a release layer and an image receiving layer on a substrate film used in the present invention, and a fusion thermal transfer ribbon are prepared.
Procedure 2. Next, an image is formed on the intermediate transfer sheet with a thermal transfer printer using the intermediate transfer sheet and the thermal transfer ribbon. FIG.
Procedure 3. Next, a water release sheet having a hot melt adhesive layer is prepared on a sheet provided with a water-soluble glue layer on paper. FIG.
Procedure 4. This water release sheet and the image-formed intermediate transfer sheet prepared above are superposed and a release layer and an image are transferred from the intermediate transfer sheet to the water release sheet by a heat roller or the like to produce a water transfer sheet on which an image is formed. FIG.
Procedure 5. Next, an adhesive sheet is prepared in which the support is an ultrathin film having a thickness of 2 to 10 μm. FIG.
Procedure 6. The support surface of the pressure-sensitive adhesive sheet and the pattern-formed water transfer sheet are superposed and thermally bonded by a heat roller to complete an ultrathin pressure-sensitive adhesive transfer sheet. FIG.
Step 7. Remove the release paper from this adhesive transfer sheet and attach it to the adherend. FIG.
Procedure 8. Next, water is immersed in the surface of the adhesive transfer sheet affixed to the adherend. Peel off the water transfer release paper in a state where water is sufficiently infiltrated into the paper. FIG.
Thereby, a high-definition image can be transferred and formed on the adherend.

Further, the sheet used in the present invention will be described in detail.
The intermediate transfer sheet used in the present invention is an intermediate transfer sheet for melt thermal transfer image recording having at least a release layer on a substrate film. As the base film, various well-known and conventional films are used as conventional base films for melt transfer. A PET film having a thickness of 9 to 100 μm can be preferably used from the viewpoint of durability, heat transfer properties, and cost.

  The release layer has a performance of peeling from the base material at the time of retransfer, and an acrylic resin, an epoxy resin, a ketone resin, a cellulose resin, or the like can be preferably used as the main agent. Moreover, since a peeling layer heat-adheres on the base material of an adhesive sheet again, it is necessary to have heat adhesiveness together. For this purpose, it is preferable to add a polyester resin, a urethane resin, a vinyl chloride vinyl acetate copolymer resin, or the like. The thickness of the release layer is preferably from 0.5 to 10 μm from the viewpoint of image formability, a feeling of thin film of the final transfer product, and followability of unevenness. A more preferable thickness is in the range of 1 to 5 μm.

  In addition, an image receiving layer is provided on the outermost surface in order to improve printability by fusion heat transfer. It is preferable to use a styrene resin, epoxy resin, acrylic resin, etc. for the image receiving layer, and if necessary, add a flexible and highly adhesive urethane resin, polyester resin, olefin resin, etc. in order to increase adhesion. Can do. In addition, various fillers can be added in the sense of blocking and tack prevention. For example, fluorine-based particles, melamine resin particles, silicon-based particles, talc, kaolin, magnesium carbonate, potassium carbonate, titanium oxide, silica, Examples include starch. The thickness of the image receiving layer is preferably from 0.1 to 5.0 μm from the viewpoint of image receiving properties and thermal sensitivity. In order to increase the fastness of the final product, a curable protective layer made of a thermosetting resin or a UV curable resin may be provided between the release layer and the image receiving layer. In addition, additives such as a film forming aid, a coating solution stabilizer, a leveling agent, and an antifoaming agent can be added to each layer.

  The water release sheet used in the present invention is obtained by laminating a water-soluble release layer and a hot-melt adhesive layer in this order on paper. As the base paper, high-quality paper and coated paper with good water permeability are preferably used, and an undercoat layer mainly composed of water-soluble starch is provided between the paper and the water-soluble release layer. The undercoat layer is made of hydrophilic starch, and its function is sufficiently water-absorbing, and the water-soluble release layer is moistened while maintaining its shape without being dissolved by water absorption. It is dissolved and exhibits releasability during water transfer.

  As the main component of the water-soluble release layer, dextrin, polyvinyl alcohol, polyvinyl pyrrolidone, polyacrylamide, polyvinyl methyl ether, poly (meth) acrylic acid-containing polymer, etherified starch, starch and the like are preferably used. In addition, PEG, a polymer absorber, porous particles, etc. may be added to increase water retention. The water-soluble release layer has a thickness in the range of 0.5 to 10 μm.

  The hot melt adhesive layer exhibits adhesiveness to the intermediate transfer sheet at the time of retransfer, and a known hot melt adhesive can be used. For example, ethylene vinyl acetate copolymer, ethylene ethyl acrylate, polyamide resin, vinyl chloride vinyl acetate copolymer, styrene resin, acrylic resin, urethane resin, polyester resin and the like can be mentioned. From the viewpoint of familiarity with the skin after water transfer, a highly flexible ethylene vinyl acetate copolymer, ethylene ethyl acrylate, urethane resin, and polyester resin are particularly preferably used. Various fillers can be added to prevent blocking and tackiness. For example, fluorine-based particles, melamine resin particles, silicon-based particles, talc, kaolin, magnesium carbonate, potassium carbonate, titanium oxide, silica, starch Etc. The thickness of the hot melt adhesive layer is in the range of 0.1 to 10 μm.

  Next, the pressure-sensitive adhesive sheet used in the present invention can be a normal pressure-sensitive adhesive film having a pressure-sensitive adhesive layer on the support, except that a soft film having a thickness of 2 to 30 μm is used for the support. In order to easily follow the unevenness of the surface of the adherend, the thickness of the support is particularly preferably in the range of 2 to 10 μm. Examples of the soft film include a polyurethane film, a polyolefin film, a silicone rubber film, and various elastomer films. A particularly preferred film is a polyurethane film.

  The thermocompression bonding in the procedure can be performed by a known method such as pressurization with a heating roller or hot pressing.

  As a colorant for the melt thermal transfer ribbon, an organic dye, an organic pigment, a lake pigment, an inorganic pigment, carbon black, a natural pigment, and the like can be appropriately selected and used. As the binder, conventionally known thermoplastic resins and waxes can be appropriately selected and used.

  Hereinafter, the present invention will be described in more detail by way of examples with reference to the drawings. However, the present invention is not limited to the examples.

Example 1
1) Preparation of intermediate transfer sheet The following ink was applied as a release layer on a PET film having a thickness of 16 μm after drying to a thickness of 2 μm.

Release layer ink
Acrylic resin 9
Polyester resin 1
Methyl ethyl ketone 90
100 parts by weight in total On the above-mentioned release layer-coated sheet, the following image-receiving layer ink was dried and applied at a thickness of 0.6 μm to form an intermediate transfer sheet.

Image-receiving layer ink
Epoxy resin 9
Polyester resin 1
Methyl ethyl ketone 90
Total 100 parts by weight 2) Preparation of melt thermal transfer ink ribbon The following ink was dried and applied to a thickness of 0.6 μm on a 4.5 μm thick PET film having a heat-resistant treatment layer on the back side, yellow, magenta, cyan A three-color ink ribbon comprising:

Ink ribbon ink
Epoxy resin 4
Polyester resin 1
Pigment 4
Dispersant 1
Methyl ethyl ketone 40
50 parts by weight In total, yellow, magenta and cyan pigments are used.

3) Preparation of water release sheet Single-sided art paper coated on one side was used, and an aqueous 6% etherified starch solution was applied to the coated surface as an undercoat layer so that the dry coating amount was 2 μm. Further, the following ink was applied as a water-soluble glue layer on the undercoat layer and dried to 4 μm.

Water-soluble glue layer ink
Polyvinyl alcohol 5
Dextrin 4
PEG 1
Distilled water 20
30 parts by weight
A 20% toluene solution of an ethylene vinyl acetate copolymer (MFR150, VA% 28%) as a hot-melt adhesive layer was dried and applied to a thickness of 2 μm on the water-soluble adhesive layer to prepare a water release sheet.

4) Formation of image by fusion thermal transfer onto intermediate transfer sheet A full color image was formed on the intermediate transfer sheet using the intermediate transfer sheet prepared above, a fusion thermal transfer ribbon, and the following fusion thermal transfer printer. (Figure 2)
Thermal transfer printer: Test printer, 300 dpi edge head, peeling distance 10 mm
Image: Portrait (ISO / DIS12640 registered image data)
Printing speed: 1 inch / second 5) Preparation of water transfer sheet The image-receiving layer surface of the image-formed intermediate transfer sheet prepared in section 4) and the hot-melt adhesive layer surface of the water release sheet prepared in section 3) are bonded together. With the attached laminator, the image was transferred again from the intermediate transfer sheet to prepare a water transfer sheet. (Fig. 4)
Laminator temperature 150 ℃
Laminator speed 1 inch / min 6) Preparation of adhesive transfer sheet Adhesive layer surface of release layer of image-formed water transfer sheet prepared in 5) and adhesive of 20 μm thick adhesive layer provided on 10 μm thick polyurethane film support The support side from which the protective paper in close contact with the support of the sheet (manufactured by FLEX SHIELD Ribatape) was superposed, and heat-pressed by a laminator with a heating roller to prepare an adhesive transfer sheet. (Fig. 6)
Laminator temperature 150 ℃
Laminator speed 1 inch / min 7) Transfer to adherend A white leather bag was used as the adherend.
The release paper of the pressure-sensitive adhesive transfer sheet produced in the item 6) was peeled off, and the pressure-sensitive adhesive layer surface was attached to the back surface. (FIG. 7) Thereafter, water was sufficiently immersed in the paper on the surface, and the paper on the surface was peeled off. (Fig. 8)
Thereby, a high-definition portrait image could be formed on the leather bag, and the texture of the leather could be maintained.

(Example 2)
As the pressure-sensitive adhesive sheet used in the procedure 6) of Example 1, a pressure-sensitive adhesive transfer sheet was prepared in the same manner as in Example 1 except that a pressure-sensitive adhesive sheet having a total thickness of 10 μm and a thickness of the support of 5 μm and a pressure-sensitive adhesive layer of 5 μm was used. An image was formed on a white leather bag.

(Example 3)
A pressure-sensitive adhesive transfer sheet was prepared in the same manner as in Example 1 except that the pressure-sensitive adhesive sheet used in step 6) of Example 1 was a pressure-sensitive adhesive sheet having a thickness of 20 μm and a pressure-sensitive adhesive layer of 20 μm and a total thickness of 40 μm. An image was formed on a white leather bag.

Image evaluation and evaluation results on leather back Score standard ◎: The texture of the underlying leather can be followed cleanly
○: The texture of the underlying leather can follow
△: Some of the texture of the underlying leather is not able to follow ×: The texture of the underlying leather is not following

Table 1

DESCRIPTION OF SYMBOLS 1 Base film 2 Release layer 3 Image receiving layer 4 Melting thermal transfer ink ribbon 5 Thermal head 6 Intermediate transfer sheet 7 Platen roll 8 Image 9 Hot melt adhesive layer 10 Water-soluble glue layer 11 Paper 12 Water release sheet 13 Heat roller 14 Support 15 Adhesive layer 16 release paper 17 adhesive sheet 18 water transfer sheet 19 adhesive transfer sheet 20 adherend

Claims (2)

An intermediate transfer sheet having at least a release layer and an image receiving layer on a base film, a water release sheet having a water-soluble release layer on paper and a hot melt adhesive layer thereon, and an adhesive sheet having an adhesive layer on a support After the image is printed on the intermediate transfer sheet with a thermal transfer printer, the image is re-transferred by superimposing the image-receiving layer surface of the intermediate transfer sheet and the hot-melt adhesive layer surface of the water release sheet and then thermocompression bonding. A pressure-sensitive adhesive transfer sheet formed by forming a sheet, and further superposing the release layer surface of the water transfer sheet on which the image has been transferred and the support surface of the pressure-sensitive adhesive sheet, and then thermocompression bonding. The pressure-sensitive adhesive transfer sheet according to claim 1, wherein the support is a film having a thickness of 2 to 10 μm.

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