JP2013220570A - Heat transfer protection layer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat transfer protection layer excellent in transfer stability and preservation stability.SOLUTION: A heat transfer protection layer includes a support sheet, a release layer formed on the support sheet, a protection layer formed on the release layer, and an adhesive layer formed on the protection layer. The release layer contains a mixture of polyvinyl alcohol and a water dispersion polymer polyester resin.

Description

  Embodiments described herein relate generally to a thermal transfer protective layer.

  Personal authentication media such as ID cards, employee ID cards, and ID cards have face images and description information printed on their surfaces. Many of these are covered with a transparent protective layer to protect the face image portion or the entire surface of the card from damage or deterioration. This protective layer is made of a material that is cured by UV, heat, electron beam, or the like. The card is protected by transferring a ribbon-shaped protective layer onto the card. There are roughly two procedures for forming a protective layer by this transfer. One is a procedure for transferring the protective layer onto the card and then UV, heat, and electron curing, and the second is a procedure for transferring the already cured protective layer onto the card. By these procedure methods, the cards such as the current ID are protected.

  The latter of these two procedures has problems and problems. When a protective layer that has already been cured is prepared, UV irradiation is performed when the protective layer is applied to the support and dried to complete the curing. At that time, the protective layer is strongly fixed on the support side and does not peel off from the support, making transfer difficult. On the other hand, although it is possible to use a peeling support body, since a peeling support body does not necessarily have sufficient peelability with respect to a protective layer, the operation | work which confirms experimentally is needed. Also, peel strength is an important issue during thermal transfer. If the peel strength is too light, the protective layer in the ribbon state will be flipped, the protective layer will be peeled off, and the transfer of the protective layer outside the card frame during transfer If this is induced and heavy peeling occurs, the transfer layer of the protective layer is not transferred or the transferability is unstable. Therefore, it is necessary to realize adhesion that is weaker than the transfer strength of the adhesive layer at the time of transfer, while maintaining sufficient adhesion that cannot be easily peeled off from the protective layer.

JP 2003-423280 A

  An object of the embodiment of the present invention is to provide a thermal transfer protective layer having good transfer stability and storage stability.

  The thermal transfer protective layer according to the embodiment includes a support sheet, a release layer formed on the support sheet and including a mixture of polyvinyl alcohol and a water-dispersed polymer polyester resin, a protective layer formed on the release layer, and the protection An adhesive layer formed on the layer is provided.

It is a figure showing an example of the composition of the thermal transfer protection layer concerning an embodiment. It is sectional drawing showing an example of the surface structure of the ID card which can be used for embodiment. It is sectional drawing showing an example of the ID card concerning embodiment. It is a figure for demonstrating an example of the printing apparatus of the ID card concerning embodiment.

  Hereinafter, embodiments will be described with reference to the drawings.

  FIG. 1 is a diagram illustrating an example of the configuration of the thermal transfer protective layer according to the embodiment.

  As shown in the drawing, the thermal transfer protective layer 10 according to the embodiment is formed on the support sheet 1, the release layer 2 formed on the support sheet 1, the protective layer 3 formed on the release layer 2, and the protective layer 3. The adhesive layer 4 is included. The release layer 2 used in the embodiment includes a mixture of polyvinyl alcohol and a water-dispersed polymer polyester resin.

  According to the embodiment, a mixture of polyvinyl alcohol and a water-dispersed polymer polyester resin is used as a release layer, and the adhesiveness and the peel-off are changed only by changing the mixing ratio of the polyvinyl alcohol and the water-dispersed polymer polyester resin as necessary. It is possible to realize a UV-cured thermal transfer protective layer having a release layer that can cope with the combination of the protective layer and the adhesive layer by adjusting the balance of the properties to vary the peel strength. Thus, in the thermal transfer protective layer having a configuration in which at least a release layer, a protective layer, and an adhesive layer are laminated on one side of the support sheet, even when the thermal transfer protective layer is wound and stored in a ribbon shape, it is protected. There is no set-off or peeling off of the layer, so that the storage stability is good and sufficient transfer stability is obtained even during transfer.

  The thickness of the release layer is preferably 0.1 μm to 10 μm.

  If the thickness is less than 0.1 μm, the film does not serve as a release layer and cannot be peeled off. If the thickness exceeds 10 μm, the necessary and sufficient thickness tends to be greatly exceeded, and there is a tendency to use too much material cost in terms of cost.

  There is no restriction | limiting in particular as a material of a support sheet, All can be used if it is used for the normal transfer foil which has sufficient self-holding property. For example, polyethylene terephthalate film, polypropylene film, polyethylene film, polyamide film, polyamideimide film, polycarbonate film, polystyrene film, synthetic resin film such as polyvinyl chloride film, artificial resin film such as cellulose acetate film, cellophane paper, glassine paper, etc. Examples thereof include film-like materials such as western paper and Japanese paper, or composite film-like materials or composite sheet-like materials thereof. A film having a processed surface such as corona treatment or anchor coating can also be used.

  The thickness of the support sheet can be, for example, 6 μm to 50 μm.

Examples of the material for the protective layer include thermoplastic resins, ultraviolet curable resins, thermosetting resins and the like, electron beam curable resins, and mixtures thereof. Thermoplastic resins include polyester resins, polyurethane resins, Vinyl chloride resin, polyvinyl acetate resin, vinyl chloride-vinyl acetate copolymer resin, ethylene-vinyl acetate copolymer resin, epoxy resin, polyvinyl butyral resin, polyvinyl alcohol resin, phenoxy resin, ethyl cellulose resin, cellulose acetate propionate resin, nitro Cellulose resin, polystyrene resin, polymethyl methacrylate resin, polyethyl acrylate resin, styrene-acrylic copolymer resin, polyamide resin, petroleum resin, ethylene-acrylic acid copolymer resin, ethylene-acrylic acid ester copolymer resin, chlorination Polypro Ren resins, polyolefin resins, ethylene-ethyl acrylate resin, rosin-modified phenolic resins, various synthetic rubbers such as NBR · SBR · MBR and the like. Examples of the ultraviolet curable resin or electron beam curable resin include resins such as urethane acrylate, polyester acrylate, epoxy acrylate, unsaturated polyester, and other special acrylates. Examples of the thermosetting resin include phenol resin, epoxy resin, melamine resin, urea resin, unsaturated polyester resin, alkyd resin, polyurethane, and thermosetting polyimide.

  The thickness of the protective layer can be set to 1 μm to 15 μm, for example.

  Examples of the material of the adhesive layer include polyester-isocyanate resins, urethane resins, acrylic resins, vinyl acetate resins, vinyl chloride resins, styrene-butadiene resins, vinyl chloride vinyl acetate resins, and ethylene-vinyl acetate resins. , Polyester-based resins, chlorinated rubber-based resins, chlorinated polypropylene-based resins, and other organic solvent-based resins, and emulsion-based resins alone or mixtures thereof.

  The thickness of the adhesive layer can be set to 0.5 μm to 10 μm, for example.

  FIG. 2 is a sectional view showing an example of the surface configuration of an ID card to which the transfer protective layer of FIG. 1 can be applied.

  As shown in the figure, an image receiving layer 12 is provided on the surface of the ID card substrate 11 to form a card substrate 16 with an image receiving layer. On the image receiving layer 12, for example, a UV curable ink layer 14 for character information and a molten ink layer 15, for example, a sublimation ink layer 13 for image information, for example, are formed in a predetermined pattern. Further, the surface of the sublimable ink layer 13 is covered with a UV cut layer 17. In this way, the ID card substrate surface structure 20 is configured.

  FIG. 3 is a cross-sectional view illustrating an example of the ID card according to the embodiment.

  As shown in the figure, the ID card 30 has the adhesive layer 4 and the protective layer 3 formed on the ID card substrate surface structure 20 shown in FIG.

  FIG. 4 is a diagram for explaining an example of the ID card printing apparatus of FIG.

  When this apparatus is used, an ID card can be formed using a card substrate with an image receiving layer in which a UV curable ink layer is previously formed.

  As shown in the figure, first, the card base 16 with the image receiving layer on which the UV curable ink layer 14 (not shown) is printed is taken in the card base taking-in portion 101, and then the thermal head 18 and the ink ribbon 19 are included. In the sublimation printing / melt printing unit 102, a molten ink layer 15, for example, a sublimation ink layer 13 for image information or the like is formed on the surface of the card substrate 16 with an image receiving layer. Subsequently, the UV cut layer 17 is formed on the surface of the sublimable ink layer 13 by the UV cut layer transfer portion 103 having the UV cut layer transfer ribbon 21, the heat roller 22, and the like, thereby forming the ID card substrate surface structure 20. Further, for example, after the ID card substrate surface structure 20 is moved by a lifter 104 or the like, it is introduced into a protective layer transfer portion 105 having a protective layer transfer ribbon 23, a heat roller 22 or the like, and an adhesive layer and a protective layer thereon. The ID card 30 can be formed by transferring. Reference numeral 24 denotes a belt conveyor.

  Hereinafter, the embodiment will be described more specifically with reference to examples.

Example Example 1
Formation of Release Layer On one side of a 25 μm thick polyester support sheet, a resin liquid having the following composition was applied by a wire bar coating method so as to have a thickness of 1 μm, and then dried to form a release layer.

Release layer resin liquid composition pure water ... 90 parts by weight polyvinyl alcohol NL-05 (Nippon Synthetic Chemical) ... 7 parts by weight water-dispersed polymer polyester resin MD1200 (Toyobo) ... 3 parts by weight of protective layer On the release layer, a protective layer having the following composition was applied by a wire bar coating method so as to have a thickness of 10 μm and dried to form a protective layer. Thereafter, UV irradiation with a peak illuminance of 45 (mW / cm ² ) and an integrated light quantity of 321 (mJ / cm ² ) was performed from above the protective layer, and the protective layer was UV cured.

Protective layer resin liquid composition Methyl ethyl ketone ... 67 parts by weight Thermoplastic acrylic resin BR-87 (manufactured by Mitsubishi Rayon) ... 11.5 parts by weight Butyral resin BL-S (manufactured by Sekisui Chemical) ... 1 part by weight Bifunctional acrylate monomer FM-400 (Nippon Kayaku Co., Ltd.) ... 16 parts by weight Multifunctional acrylate monomer DPHA (Nippon Kayaku Co., Ltd.) ... 3 parts by weight Irgacure 651 (Nagase Sangyo) ... 1 Formation of Weight Part Adhesive Layer An adhesive layer having the following composition was applied on the protective layer to a thickness of 3 μm by a wire bar coating method and then dried to form an adhesive layer.

Adhesive layer resin liquid composition pure water ... 85 parts by weight water-dispersed acrylic acid ester copolymer ET-325 (Nippon Toagosei) ... 15 parts by weight silicone fine particles KMP-701 (Shin-Etsu Chemical) ... 0 .05 parts by weight Thus, a protective layer ribbon in which the release layer, the protective layer, and the adhesive layer were laminated on the support sheet was formed, and the obtained protective layer ribbon was wound up.

  A resin liquid having the following composition was applied to one side of a white polyester substrate (made by Toray KK, product model number: E20) having a thickness of 50 μm, and heated and dried at 120 ° C. for 30 minutes to form an image receiving layer.

Image receiving layer composition Methyl ethyl ketone 30 parts by weight Toluene 30 parts by weight Polyester urethane resin UR-1400 (Toyobo) 30 parts by weight Amino-modified silicone oil TSF4700 (Toshiba Silicone) 0.2 parts by weight Poly Isocyanate Coronate 2513 (Nippon Polyurethane) ... 1 part by weight UV curable ink layer formed A UV curable ink layer such as a logo mark and a frame line was printed on the image receiving layer with UV curable ink.

Steps in the printing apparatus FIG. 4 shows the configuration of a printing machine that prints images and individual information on a card substrate with an image receiving layer on which a UV curable ink layer is printed, and transfers the UV cut layer and the protective layer as follows. It is the same as the device.

(A) A card that has been completely printed with UV curable ink is taken into a printing machine.

(B) Individual information is printed on the card by melt printing, and an image is printed by sublimation printing.

(C) The UV cut layer is transferred onto the sublimation printing part on which the image is printed.

(D) Transfer the protective layer to the entire card surface.

(E) The completed card is discharged out of the printing press.

In step (D), the transfer protective layer is overlaid on the card so that the adhesive layer side of the transfer protective layer contacts the card surface. Then, while feeding the transfer ribbon and the card by the heat roller, the platen roller, and the shaft, the platen roller is heated and pressed by the heat roller from the support sheet side of the transfer protection layer at a pressure of 60 kg weight / m ² and a transfer speed of 28 mm / s. A protective layer made of a UV curable resin is transferred to the card surface located above.

The temperature of the heat roller at that time was set so that the card surface temperature would be 100 ° C., and transfer was performed at each temperature.

Examples 2-13, Comparative Examples 1-4
ID cards according to Examples 2 to 9 were prepared under the same layer configuration, medium, and body conditions except for the composition of Example 1 and the release layer.

The composition of the adhesive layer in each example is shown in Table 1 below. In the table, NL-05 is a polyvinyl alcohol with a product name of Gohsenol manufactured by Nippon Synthetic Chemical, and MD-1200 and MD-1500 are water-dispersed polymer polyester resins with a product name of Byronal manufactured by Toyobo.

Comparative Examples 5-12
Examples of comparison results are shown below.

The results of storability of various ribbons when stored in the ribbon state and transferability to the card are shown.

  The storage stability during storage in the ribbon state was evaluated based on whether the protective layer transfer ribbon was stored in a ribbon state for 1 month, and then was not rolled up and the protective layer was missing.

○ indicates no set-off, and x indicates set-off and chipped.

  Further, the transferability was evaluated based on whether the transfer was performed under the conditions of the above example, the protective layer was completely transferred onto the card, and the portion lacking the protective layer was transferred at 0.2 mm or less.

○ indicates no chipping of 0.2 mm or more, and × indicates chipping of 0.2 mm or more.

  The peelability is evaluated based on whether or not the protective layer is transferred larger than the card size and the extra protective layer is not more than 0.2 mm on the card side after the transfer. did.

○ is no burr of 0.2 mm or more, and x is burr of 0.2 mm or more.

  From the above examples and comparative examples, it is possible to select a release layer having an optimum release force for the UV-cured protective layer only by the mixing ratio of the resin, and a highly convenient transfer foil, ID card preparation method and ID card Can be provided.

  The content of the water-dispersed polymer polyester resin relative to the total weight of the polyvinyl alcohol and the water-dispersed polymer polyester resin used in the release layer can be 10 to 70% by weight. If the amount is less than 10% by weight, light peeling is likely to cause set-off or peeling off, and if it exceeds 70% by weight, there is a tendency for heavy peeling to be impossible to transfer.

Example 14
A protective layer ribbon was formed in the same manner as in Example 1 except that the protective layer resin liquid composition and the adhesive layer resin liquid composition were changed as described below to obtain an ID card.

Protective layer resin liquid composition Methyl ethyl ketone: 67 parts by weight Thermoplastic acrylic resin BR-87 (Mitsubishi Rayon Co., Ltd.): 11.5 parts by weight Butyral resin BL-10 (Sekisui Chemical Co., Ltd.): 1 part by weight Monofunctional acrylate monomer M-117 (manufactured by Toagosei Co., Ltd.) ... 10 parts by weight Polyfunctional acrylate monomer DPHA (manufactured by Nippon Kayaku Co., Ltd.) ... 10 parts by weight Irgacure 127 (Nagase Sangyo) ... 1 weight Partial Adhesive Layer Resin Solution Composition Pure Water ... 85 parts by weight Ethylene Vinyl Acetate SP-3055 (Konishi Bond) ... 15 parts by weight While some embodiments of the present invention have been described, these embodiments are given as examples It is presented and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Support sheet, 2 ... Release layer, 3 ... Protective layer, 4 ... Adhesive layer, 10 ... Thermal transfer protective layer

Claims (2)

  A support sheet, a release layer formed on the support sheet and containing a mixture of polyvinyl alcohol and a water-dispersed polymer polyester resin, a protective layer formed on the release layer, and an adhesive layer formed on the protective layer A thermal transfer protective layer comprising:   The thermal transfer protective layer according to claim 1, wherein the content of the water-dispersed polymer polyester resin is 10 to 70% by weight based on the total weight of the polyvinyl alcohol and the water-dispersed polymer polyester resin.

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