JP2005224956A - Hydraulic transfer method and hydraulic transferred article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic transfer method by which necessary and sufficient adhesivity can be reproduced in an ink being a printing pattern on a transfer film without using an organic solvent to avoid air pollution caused by the use of the organic solvent and the resultant health problems of workers, and the top coating layer can also more firmly be adhered to a decoration layer, and to impart a surface protective function capable of mechanically and chemically protecting the decorative layer of an article to be hydraulically transferred, simultaneously when the decorative layer is transferred. <P>SOLUTION: An ultraviolet curing resin composition 20 is applied on the printing pattern 16 of the transfer film 18 having a protective layer 14 for top coating and the printing pattern 16 for decoration thereupon, and the printing pattern 16 and the protective layer 14 for top coating are activated with the ultraviolet curing resin composition 20 to reproduce the adhesivity. Under that condition, an article 10 is sank in water together with the transfer film 18, thereby irradiating ultraviolet rays 24 on the article 10 on which the printing pattern 16 containing the ultraviolet curing resin composition 20 and the protective layer 14 for top coating are transferred, to cure the ultraviolet curing resin composition 20. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a hydraulic transfer method for improving the surface characteristics of a decorative layer when a decorative layer is applied to the surface of an article by the hydraulic transfer method, and a hydraulic transfer product obtained by this method.

  In the hydraulic transfer method, a transfer film having a water-insoluble printing pattern on a water-soluble film is floated on the water surface in the transfer tank, and the water-soluble film in the transfer film is wetted with water. A method for forming a decorative layer by pressing an article (transfer object) into the water in a transfer tank while contacting the print pattern of the transfer film, and transferring the print pattern of the transfer film to the surface of the article using water pressure It is. Usually, since the transfer film is formed by printing a print pattern on a water-soluble film in advance, the ink of the print pattern is in a dry state. It is necessary to apply an agent or thinner to the printed pattern in a wet state (return to a state in which adhesiveness is developed) just after printing, which is usually referred to as activation. Further, in order to impart abrasion resistance, solvent resistance, chemical resistance, weather resistance, etc. to the decorative layer formed on the surface of the article in this way, a transparent surface protective layer (top coat) is provided on the decorative layer. Layer) must be formed.

  In the first prior art, the surface protective layer is formed by spraying an ultraviolet curable paint on a decorative layer formed by transferring a printing pattern, and irradiating the ultraviolet curable paint with ultraviolet rays. Was formed by curing.

  However, this method does not improve the solvent resistance of the decorative layer itself, but attempts to make the top coat layer overcoating the decorative layer have wear resistance, solvent resistance, etc. Since the UV curable coating is applied after the printed pattern is transferred onto the article, washed with water and dried, these processes take a relatively long time, and drying is generally performed by exposure to hot air. Therefore, there is a defect that dust easily adheres to the decoration layer and deteriorates the appearance of the decoration layer.

  In the second conventional technique, a method of simultaneously performing hydraulic transfer of a print pattern and formation of a surface protective layer has been proposed (see Patent Document 1). In this method, a transparent or translucent surface protective layer made of a water-insoluble resin is formed on a water-soluble film and a water-insoluble printing layer is further formed thereon to form a transfer film with a protective layer. This is a method in which a transfer film with a layer is hydraulically transferred to an article (transfer object).

  In this method, when the surface of the article is brought into contact with the transfer film using water pressure during the hydraulic transfer, the surface protective layer and the printing layer on the water-soluble film are simultaneously transferred to the surface of the article. Unlike the prior art 1, the coating process and the curing process of the protective coating after the transfer process are not required, and dust does not adhere between the decorative layer and the surface protective layer.

  Thus, this method is advantageous because the surface protective layer is formed simultaneously with the transfer of the printing layer, so that the work process is simplified and the appearance of the decorative layer is not deteriorated. Since the layer is made of a protective agent having low solvent resistance such as butyl methacrylate polymer and ethyl methacrylate polymer, the surface of the printed layer of the article can be mechanically protected by imparting abrasion resistance and the like. In addition, there is a drawback in that it is poor in chemical protection and weather resistance is low, such as being easily altered when touched with a solvent or chemicals.

  Similar to the second prior art, a third prior art using a resin that is cured by ultraviolet rays or the like in the surface protective layer of the second prior art has been proposed (see Patent Documents 2 and 3g). .

  In this third prior art, since the surface protective layer uses a resin that is cured by ultraviolet rays or the like, it is effective for mechanically or chemically protecting the surface of the decorative layer. It has several disadvantages which are undesirable in reproducing the adhesion of the printed pattern on the outermost surface of the.

  In other words, as is common to the first to third prior arts described above, during transfer, an activator or thinner is applied to the print pattern on the transfer film to reproduce the adhesion of the print pattern. Since organic solvents are used in the activators and thinners used for this, it is necessary to allow time for the solvent components to evaporate and drying conditions as process conditions. Residual components may adversely affect quality, and organic solvents are released into the atmosphere or inhaled during work, so organic solvents are used to activate printed patterns. This has become a problem that must be dealt with promptly as a cause of air pollution and health problems of workers.

  Therefore, the present applicant tried to directly apply the ultraviolet curable paint, which is also an environmentally-friendly paint and has already been used in the first prior art, to the print pattern on the transfer film. Although it was possible to temporarily reproduce the adhesion to the ink of the pattern, if it was attempted in a continuous operation during the hydraulic transfer process, the adhesion of the printed pattern was reduced at the time of transfer, resulting in a transfer failure. It has been found. Furthermore, when the same ultraviolet curable ink composition which is the same ultraviolet curable resin composition and which does not contain a colored pigment was tried in the same manner, it was possible to reproduce the adhesion to the ink of the print pattern, It has been discovered that transfer can be performed without a decrease in adhesion even at the time of transfer.

  In the case of hydraulic transfer, it is not only necessary to return the ink of the print pattern to a wet state and reproduce the adhesion, but the water-soluble film supporting the print pattern is also wetted with water in the transfer tank, so that the article is submerged in water. When pressed into the sheet, both the printed pattern and the water-soluble film need to wrap around the article surface. Therefore, it is necessary to push the article into the water at the timing when both wet states are harmonized, and it is necessary to reproduce the adhesiveness that can be applied to the article until the transfer is completed. is there.

  For this reason, the difference in the results of these trials seems to have arisen from the difference in composition as a product by use of UV curable paint and UV curable ink, although the same UV curable resin composition. The curable paint contains a low boiling point solvent, but the UV curable ink generally does not contain a solvent. Therefore, when UV curable paint is applied to the print pattern, this paint is used. The original adhesiveness is reproduced by the solvent in the solvent, but at the time of transfer, the solvent is volatilized and the adhesiveness is lowered. On the other hand, the ultraviolet curable ink does not contain a solvent component. It is speculated that the non-solvent activating component in the curable ink will reproduce the adhesion, and after that, various experiments and the like were repeated, and the present inventor found that the solvent-free UV curable resin composition Thus to reproduce the adhesion to the dried print pattern of the transfer film has proposed a method of hydraulic transfer (see Patent Document 4).

  This method is preferable because the UV curable resin composition for reproducing adhesiveness is naturally integrated with the decorative layer of the transfer object (article), and the surface protecting action is imparted to the decorative layer itself. In this case, if the water pressure transfer is performed separately, the transfer work and the UV irradiation work (when the surface protective layer is made of UV curable paint) must be performed separately, so that the workability is reduced and the top coat layer is reduced. It was difficult to improve the adhesion between and the decorative layer. Note that the technique of simultaneously transferring the top coat layer and the decorative layer by hydraulic pressure is known from Patent Document 2, but this technique is merely a hydraulic transfer of the top coat layer and the decorative layer at the same time. In addition, since the adhesiveness between the two is only maintained by the adhesion at the time of lamination, it cannot be further strengthened at the time of hydraulic transfer.

Japanese Patent Laid-Open No. 4-197699 Japanese Patent Laid-Open No. 2003-200698 JP 2003-305998 A Japanese Patent Application No. 2003-409874

  One problem to be solved by the present invention is to reproduce the necessary and sufficient adhesion to the ink that is the printing pattern on the transfer film without using an organic solvent, and to prevent air pollution and labor caused by using an organic solvent. It is an object of the present invention to provide a hydraulic transfer method capable of avoiding health hindrance and capable of more firmly attaching a top coat layer to a decorative layer.

  Another problem to be solved by the present invention is that the decorative layer itself on the article has a mechanical and chemical surface protection function such as abrasion resistance, solvent resistance, chemical resistance, weather resistance, etc. transferred to the printed pattern. Another object of the present invention is to provide a hydraulic transfer method that can be applied at the same time and can further improve the surface protection function.

  Still another object of the present invention is to provide a hydraulic transfer method that reduces the chance of dust adhering to the decorative layer of an article.

  Yet another problem to be solved by the present invention is to provide mechanical and chemical surface protection functions to the decorative layer itself of the article simultaneously with the transfer of the decorative layer, without causing problems of air pollution and health problems of workers. The object of the present invention is to provide a high-quality water-pressure transfer product that can further improve the surface protection function and does not adhere to dust.

  The method of the present invention comprises a transfer film printing pattern formed by sequentially applying a topcoat protective layer and a decorative print pattern on a water-soluble film, and a topcoat protective layer. The first basic problem-solving means of the present invention is a method of applying a solventless UV-curable resin composition on a printing pattern of a transfer film by applying a hydraulic transfer to the surface. A step of reproducing the adhesion of the printed pattern with a non-solvent activating component in the product, and a step of pushing the article into the water together with the transfer film so as to press the surface of the article against the printed pattern containing the ultraviolet curable resin composition; An ultraviolet curable resin composition is obtained by irradiating an article to which a decorative print pattern containing an ultraviolet curable resin composition and a protective layer for a topcoat thereon are transferred with ultraviolet rays. Is characterized by comprising a step of curing the ultraviolet-curable resin composition in a state of being blended together the at least a portion of the print pattern and the ultraviolet curing resin component and the protective layer.

  In the problem-solving means of the present invention, the non-solvent activating component in the ultraviolet curable resin composition that reproduces the adhesiveness of the printed pattern may contain a photopolymerizable monomer. Moreover, it is preferable that the process of irradiating ultraviolet rays is performed while the water-soluble film of the transfer film is wound around the article. Further, the ultraviolet ray and the ultraviolet curable resin composition may be an electron beam and an electron curable resin composition that is cured by an electron beam.

  In the problem-solving means of the present invention, the protective layer for the topcoat can be a transparent ink or an ultraviolet curable resin composition, and is preferably a solventless type ultraviolet curable resin composition.

  Another problem solving means of the present invention is to provide a hydraulic transfer product having a decorative layer formed by the hydraulic transfer method according to the basic problem solving means.

  The decorative layer of the hydraulic transfer product according to the above-mentioned means for solving the problems of the present invention is soiled by a solvent resistance test performed by wiping eight times while rubbing a layer of 10 sheets of gauze containing xylene by hand. It is preferable that it is not.

  Thus, the printed pattern typically has the necessary and sufficient adhesion just after printing due to the non-solvent activating component in the solvent-free UV curable resin composition, which is preferably a photopolymerizable monomer. Reproduction and reproduction of the adhesion can be performed without using an organic solvent, so that there is no problem of air pollution or worker health disturbance due to the use of the organic solvent.

  The composition component in the ultraviolet curable resin composition such as the photopolymerizable monomer enters the ink of the print pattern and is mixed with the print pattern, so to speak, the so-called ultraviolet curable resin composition and the print pattern are naturally integrated. Since it is cured, mechanical and chemical surface protection functions such as abrasion resistance, solvent resistance, chemical resistance, and weather resistance are imparted to the decorative layer itself on the article.

  Combined with the surface protection function such as solvent resistance imparted to the decorative layer, the surface of the decorative layer can be sufficiently protected by the top coat layer that is hydraulically transferred onto the decorative layer at the same time, A part of the ultraviolet curable resin composition for reproducing the adhesion penetrates into the protective layer for the top coat, and the adhesion between the top coat and the decorative layer can be further improved. In particular, when this topcoat layer is an ultraviolet curable resin composition, the ultraviolet curable resin composition and the ultraviolet curable resin for the topcoat, which are applied to reproduce the adhesion of the printed pattern and are steadily integrated with the decorative layer Together with the composition, the mechanical and chemical surface protection of the decorative layer is further enhanced. This topcoat layer also gives depth to the surface appearance of the article.

  In addition, the process of irradiating the UV curable paint for the UV curable resin composition or transfer film top coat with UV light is performed in water or before washing with water to remove the water-soluble film even if it comes out of water. There is no opportunity for dust to adhere to the printed pattern, the yield rate is improved, and a product having a decorative layer with a good appearance can be obtained.

  An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 schematically shows a water pressure transfer method to which the present invention is applied. This water pressure transfer method is a top coat on a water-soluble film 12. The transfer film 18 formed by applying the protective layer 14 for decoration and the printing pattern 16 for decoration is supplied and floated on water 22 in a transfer tank (not shown) so that the printing pattern 16 becomes the upper surface. In this method, the article 10 to be hydraulically transferred is pushed into the water 22 through the transfer film 18 and hydraulically transferred.

  The water-soluble film 12 is made of a water-soluble material mainly composed of, for example, polyvinyl alcohol, which absorbs water and gets wet and softens. The water-soluble film 12 touches the water 22 in the transfer tank and softens around the article to be decorated at the time of water pressure transfer so that water pressure transfer can be performed. The protective layer 14 for the top coat can be an appropriate dry-curing paint or other composition having abrasion resistance and chemical resistance, and is preferably a transparent ink or an ultraviolet curable resin composition, particularly as described later. In addition, it is preferably made of the same solventless type ultraviolet curable resin composition as the material for reproducing the adhesiveness on the printed pattern 16. The protective layer 14 is applied on the entire surface of the water-soluble film 12 by an appropriate application means. In the case of general hydraulic transfer, the print pattern 16 is applied to the protective layer 14 on the water-soluble film 12 by gravure printing or other appropriate means. The print pattern 16 includes a solid (non-pattern) print layer in addition to a pattern in a strict sense. When the protective layer 14 for the top coat is made of an ultraviolet curable resin composition, the protective layer 14 is provided with a printing pattern 16 in a pre-dried state. It is desirable to be printed by.

  The method of the present invention is characterized in that a solventless UV curable resin composition is applied to the print pattern 16 of the transfer film 18 before hydraulic transfer to the article. An example of specific steps of the hydraulic transfer method of the present invention is shown in FIG. 2, and the protective layer 14 and the printed pattern 16 applied on the water-soluble film 12 are in a dried state (see FIG. 2A). . Although not shown, actually, the transfer film 18 is preliminarily coated with a protective layer 14 and a printing pattern 16 on a long water-soluble film 12, printed, dried and wound into a roll, The transfer film 18 is used while being continuously drawn out from the film roll or while being cut at an appropriate length.

  When performing the hydraulic transfer, a solventless type ultraviolet curable resin composition 20 is applied on the printed pattern 16 in a dried state of the transfer film 18 (see FIG. 2B), and this solventless type ultraviolet curable resin is applied. The transfer film 18 is floated on the water 22 in the transfer tank in a state where the adhesiveness of the printed pattern 16 is reproduced by the composition 20 (see FIG. 2C), and then the ultraviolet curable resin composition 20 is included on the surface 10S of the article 10. The article 10 is pushed into the water together with the transfer film 18 so as to press the print pattern 16 (see FIG. 2D), whereby the print pattern 16 including the ultraviolet curable resin composition 20 and the protective layer 14 for the top coat thereon are formed. The transferred article 10 is irradiated with ultraviolet rays 24 to cure the ultraviolet curable resin composition 20 and the printed pattern 16 (see FIG. 2E). In the case where the protective layer 14 is made of an ultraviolet curable resin composition, the ultraviolet curable resin composition as the protective layer 14 is completely cured together with the ultraviolet curable resin composition 20 for reproducing adhesiveness by this ultraviolet irradiation process. In addition, in order to explain together the state in which the protective layer 14 is cured with the ultraviolet curable resin composition for reproducing the adhesion in the ultraviolet irradiation process, the protective layer 14 made of the ultraviolet curable resin composition will be described below. To do.

  Although not shown, in actuality, the article 10 is pushed into water while being conveyed by an inverted triangular conveyor or supported by a robot arm. In some cases, the article 10 is a solventless type on the printed pattern 16. On the printed pattern 16 of the transfer film 18 floated in water, the process sequence of the step of applying the ultraviolet curable resin composition 20 (see FIG. 2B) and the step of floating in the water 22 (see FIG. 2C) are reversed. Alternatively, a solventless type UV curable resin composition 20 may be spray applied to reproduce the adhesion of the printed pattern.

  An ultraviolet curable resin is a resin that cures in a relatively short time by the chemical action of ultraviolet rays, and takes forms such as an ultraviolet curable paint, an ultraviolet curable ink, and an ultraviolet curable adhesive depending on the application. These basically comprise (1) a photopolymerizable prepolymer, (2) a photopolymerizable monomer, and (3) a photoinitiator as essential components. In addition, solvents such as thinner are generally added to those marketed as UV curable paints, and in the case of UV curable inks, solvents such as alcohol may be added. A typical ultraviolet curable ink does not contain a solvent and is formulated so that a photopolymerizable monomer functions as a diluent. The “ultraviolet curable resin composition” that is the subject of the present invention includes a photopolymerizable prepolymer, a photopolymerizable monomer, and a photoinitiator as essential components, regardless of the form of the ultraviolet curable resin according to use, and a solvent. Is in a liquid state before being cured by ultraviolet irradiation without being added.

As described above, the “ultraviolet curable resin composition” used in the present invention excludes the ultraviolet curable resin composition containing a solvent, and is limited to a solventless type ultraviolet curable resin composition to which no solvent is added. . The reason for this is that, in the present invention, the reproduction pattern of the transfer film and the adhesion of the protective layer for the topcoat are reproduced by a non-solvent activating component in the solvent-free UV curable resin composition, typically It is because it tries to be based on a photopolymerizable monomer. The ultraviolet curable resin composition applicable to this invention consists of the component which has the following composition, for example.
(1) Oligomer (photopolymerizable prepolymer) 30 to 50% by weight
(2) Multifunctional acrylate (photopolymerizable monomer) 10-30% by weight
(3) Monofunctional acrylate (photopolymerizable monomer) 10 to 40% by weight
(4) Photoinitiator 0.5-5% by weight
(5) Non-reactive additive 1-20% by weight

  The photopolymerizable prepolymer is a polymer that can be further cured by photochemical action, and is called a photopolymerizable unsaturated polymer, or a base resin or a photopolymerizable oligomer. And this is a basic component that affects the basic physical properties of the cured coating film, depending on the desired properties, such as acrylic oligomer, polyester oligomer, epoxy acrylate oligomer, urethane acrylate oligomer, etc. Any of these can be used alone or in any combination. The photopolymerizable prepolymer is not as high as the final polymer, but it is not a monomer and is polymerized to some extent, so it has a suitable viscosity and considers workability during use. Thus, a diluent is required.

  The photopolymerizable monomer serves as a diluent for the photopolymerizable prepolymer to ensure practical workability of the resin composition and is itself involved in polymerization when irradiated with ultraviolet rays. There are a monofunctional monomer having one functional group and a polyfunctional monomer having two or more functional groups. The monofunctional monomer has a function of improving the adhesion to the article or imparting flexibility to the cured coating film, and the polyfunctional monomer is a crosslinking agent that bridges the prepolymer molecules. Also has a role. For example, polyacrylate such as polymethyl acrylate is used for the purpose of relaxing the shrinkage effect of the coating film due to crosslinking. Since the adhesion of the coating film decreases when the shrinkage force of the coating film increases, the polyacrylate helps to prevent this. These photopolymerizable monomers function as a diluent for adjusting the viscosity of the ultraviolet curable resin composition, but in the present invention, they also function as functional components that reproduce the adhesion of the printed pattern in a dry state. Become.

  A photoinitiator absorbs ultraviolet rays and initiates a polymerization reaction, and is also called a photopolymerization initiator. When the ultraviolet curing reaction is a radical reaction, acetophenone, benzophenone, or the like can be used. When the reaction is an ionic reaction, a diazo compound or the like can be used.

  In addition to this, a sensitizer, a filler, an inert organic polymer, a leveling agent, a thixotropy imparting agent, a thermal polymerization inhibitor, and the like may be added to the ultraviolet curable resin composition as necessary.

  The process of applying the solventless type UV curable resin composition 20 can be performed by any of gravure roll, Miya bar, or spray, but the spray coating method tends to waste a large amount of paint. A gravure roll coating method or a Miya bar coating method is preferred.

  When the solventless type UV curable resin composition 20 was applied on the print pattern 16, the photopolymerizable monomer as a non-solvent activating component in the solventless type UV curable resin composition 20 was dried on the print pattern 16. It penetrates into the ink and at least part of the protective layer 14 for the top coat, dissolves them, and wets in the same manner as after printing the printing pattern 16 and after coating the protective layer 14 on the printing pattern 16 and the protective layer 14. Reproduces the state of adhesion. Accordingly, the solventless type ultraviolet curable resin composition 20 can exhibit the same function as the conventionally used activator, and of course, the application of the activator or thinner can be omitted. Each component in the UV curable resin composition, including the photopolymerizable monomer, is generally much less volatile than the solvent, etc., so that the degree of reproducibility of adhesion may subsequently fluctuate or decrease. Therefore, it is possible to expect a more stable activation for the print pattern.

  Further, when the printed pattern 16 is transferred to the article 10 and irradiated with ultraviolet rays 24, each component of the ultraviolet curable resin composition 20 such as a photopolymerizable monomer is added to the ink of the printed pattern 16 and the protective layer 14 for the top coat. The UV curable resin composition 20 and the ink of the printed pattern 16 and the UV curable resin composition 20 and at least a part of the topcoat protective layer 14 are cured in a state of being united with each other. Thus, the decorative layer itself is provided with a chemical surface protection function such as mechanical resistance such as abrasion resistance, solvent resistance, chemical resistance, and the like. The adhesion with 16 will be further improved. Simultaneously with the ultraviolet curing of the ultraviolet curable resin composition 20, the ultraviolet curable resin composition of the protective layer 14 is also cured. In FIG. 2B, the ink component of the printing pattern 16 and the component of the protective layer 14 for the top coat and the ultraviolet curable resin composition 20 are not shown in a state of being integrated, but this is the case in the drawing. In other words, it should be understood that the two are described in layers for convenience. Further, since the photopolymerizable monomer itself participates in the polymerization after the ultraviolet irradiation, it is liberated and does not cause any badness thereafter.

  Here, even if an ultraviolet curable resin composition to which a solvent is added, such as a commercially available ultraviolet curable paint, is used, there is no problem in the activation of the printing pattern and the protective layer, and it seems to be advantageous. It may be understood that UV curable resin is cured in a short time by UV irradiation, so if the added solvent is a highly volatile low boiling solvent, it will volatilize when the article is pushed into water. If a high boiling point solvent that is difficult to volatilize is added, the problem of insufficient adhesion can be avoided when the article is pushed into water. Irradiation work must wait until the solvent is completely volatilized, or the UV-curable resin component is cured in a state where the solvent is encapsulated by UV irradiation while the solvent is not sufficiently volatilized. Become a Rukoto, a situation that results in a defect in the subsequent. As described above, when using an ultraviolet curable resin composition to which a solvent is added, whether it is a low-boiling solvent or a high-boiling solvent, in addition to causing air pollution and health impairment due to human suction, This is not preferable because it causes a number of problems.

  On the other hand, as already partially described, when using the solvent-free type ultraviolet curable resin composition 20, the photopolymerizable monomer can function as a diluent for the purpose of viscosity adjustment. Since it is formulated more than the solvent-containing type, it is necessary, sufficient and stable only by the action of a non-solvent activating component, typically a photopolymerizable monomer, in the solventless type UV curable resin composition 20 Adhesiveness can be reproduced, and furthermore, the ultraviolet curable resin composition 20 and the printed pattern 16 and the protective layer 14 are integrally cured and have a function corresponding to the solvent used in the prior art. Since the photopolymerizable monomer itself participates in the polymerization, the photopolymerizable monomer does not become bad after being released.

  The irradiation of the ultraviolet rays 24 is performed while the water-soluble film 12 of the transfer film 18 is wound around the article 10 to which the printing pattern 16 including the ultraviolet curable resin composition 20 and the protective layer 14 of the ultraviolet curable resin composition are transferred. Therefore, the ultraviolet irradiation step is preferably performed after the article 10 is still in the water or after the article 10 is removed from the water and before the water washing operation for removing the water-soluble film 12. The ultraviolet ray 24 is irradiated by a known ultraviolet curing device including a light source lamp such as a high-pressure mercury lamp and a metal halide lamp and an irradiator (lamp house).

  As described above, when the ultraviolet ray 24 is irradiated while the water-soluble film 12 is wound around the article 10, dust or the like remains attached and fixed before the printed pattern 16 and the protective layer 14 are completely dried. Since the printed pattern 16 and the protective layer 14 are cured when the water-soluble film 12 is removed, the possibility of dust adhesion can be reduced, and the decorative layer 30 having a good appearance can be easily obtained. be able to. In addition, irradiation of the ultraviolet rays 24 may be performed after the water-soluble film 12 is washed away from the article 10 when the article 10 is performed in an environment free from dust and dust such as a tunnel like a clean room. Of course.

  Thereafter, as shown in FIG. 2F, the water shower 26 is sprayed to wash the article 10, and the water-soluble film 12 of the transfer film 18 that covers the article 10 is removed. Next, as shown in FIG. 2G, the surface of the article 10 is dried by applying hot air 28 to the article 10 to which the printing pattern 16 containing the ultraviolet curable resin composition 20 and the topcoat protective layer 14 are transferred, and the decoration layer 30 is dried. And the product 10 &#0; having the top coat layer 32 is completed (see FIG. 3).

  Thus, when the decoration layer 30 and the topcoat layer 32 are applied, the topcoat layer 32 gives depth to the appearance of the decoration layer 30, and further provides mechanical and chemical surface protection for the decoration layer 30. It will be strengthened.

  As described above, the present invention can obtain various advantages by using the solvent-free type ultraviolet curable resin composition, but the “solvent-free type” in the solvent-free type ultraviolet curable resin composition referred to in the present invention Does not mean that the solvent component is absolutely zero, as long as it can provide the necessary and sufficient re-adhesion function of the printing pattern with a non-solvent activating component, typically a photopolymerizable monomer, in the UV curable resin composition. It is not excluded that a solvent component is added for the purpose of avoiding the present invention, or that the solvent component used in the production of the monomer or prepolymer remains. Similarly, “solvent-free type” does not mean that the volatility of the photopolymerizable monomer or the like is absolutely zero, but means that it is not as high as the solvent, and has a volatility that can be ignored in practice. Of course, it may be. Furthermore, equipment investment and safety management are required for hydraulic transfer work, but a photoinitiator can be cured by irradiating and curing a higher energy electron beam with a photopolymerizable prepolymer and a photopolymerizable monomer as essential components. The electron beam curable resin composition that can be omitted is an original ultraviolet curable resin composition containing a photoinitiator, in which the photopolymerizable monomer has an activation function, and the photopolymerizable monomer itself participates in polymerization. It should be understood that such an electron beam curable resin composition is also included in the concept of the ultraviolet curable resin composition in the present invention.

(Example 1)
In a specific example 1 of the present invention, on a pure water-soluble film mainly composed of polyvinyl alcohol, as a protective layer for the top coat, trade name KLCF modified 3 medium and ethyl acetate manufactured by The Inktech Co., Ltd. Was mixed with 1: 1 using a 12 mm diameter, wire number # 8 Miya bar, and air-dried for 10 minutes in a normal temperature atmosphere. Draw a brown ink called alkyd resin and nitrified cotton brand name KLCF Kai 3 Tea on the tip of the brush to draw an arbitrary handwritten pattern, let it air dry at room temperature for 20 minutes, and add a protective layer for top coat. A transfer film in which a decorative ink pattern (corresponding to a printing pattern) was laminated was obtained. Using this transfer film, hydraulic transfer was performed in the order shown in FIGS. 2A to 2G. At this time, in order to reproduce the adhesion to the ink by applying to the decorative ink pattern of the transfer film, Teikoku Ink Manufacturing Co., Ltd. A solvent-free ultraviolet curable resin composition, which is an ultraviolet curable ink marketed as “UV PAL-000 medium” under the trade name of UV type screen ink by the company, was used. This solvent-free UV curable resin composition is applied onto the ink pattern (printing pattern) of the transfer film by a Miyabar coating method immediately before introducing the transfer film into the transfer tank, and the solvent-free coating applied in this way. After the transfer film having the UV curable resin composition of the type is floated on the water surface of the transfer tank and the ink pattern reproduces the adhesion by the UV curable resin composition, as shown in FIG. The article was pushed into the water. After the ink pattern and the topcoat protective layer are transferred in this way, the article is taken out of the water, then irradiated with ultraviolet rays, washed with water and dried to obtain a hydraulic transfer product (product) as shown in FIG. 10 &#0; was obtained.

(Example 2)
Except for using a mixture of acrylic lacquer and ethyl acetate, called “Plaace” (trade name) manufactured by Musashi Paint Co., Ltd., as a protective layer for the top coat of the transfer film. The water pressure transfer was performed in the same manner as in 1.

Example 3
UV curing called the product name “UV PAL-000 medium” manufactured by Teikoku Ink Manufacturing Co., Ltd., which was applied for the purpose of reproducing (activation) the adhesion of the hydraulic transfer film as a protective layer for the top coat of the transfer film. After applying the mold ink, the composition was irradiated with extremely weak UV rays of 1% or less of the irradiation amount necessary for the original curing of the composition to stop the curing just before the touch-drying. Using the company-made large-scale inkjet printer MAXART series MC-10000 and six colors of pigment-based oil-based inks that are exclusive to this printer, ink-jet prints of appropriate images created with paint-based software are performed at room temperature. Drying for 30 minutes to obtain a transfer film in which the topcoat layer and ink pattern (corresponding to the print pattern) are laminated Except for the above, water pressure transfer was performed in the same manner as in Examples 1 and 2 above.

  In any of the examples, the two layers of the ink pattern and the topcoat protective layer are dissolved, so that the adhesion of the ink pattern is reproduced as compared with the case of transferring with a transfer film having only the ink pattern. However, it was possible to perform the water pressure transfer well in any of the examples except that the disappearance of the wrinkle of the pattern was delayed in the vicinity of the dark portion. Further, in the hydraulic transfer products (A) obtained in these examples, the top coat layer is applied to the entire surface of the decorative layer simultaneously with the transfer, but the hydraulic transfer products in Example 1 are in accordance with Examples 2 and 3. Although the glossiness is slightly lower than that of the hydraulic transfer product, there is no topcoat layer obtained by transferring the printing pattern into which the resin composition penetrates by reproducing the adhesion with a solventless UV curable resin composition Compared with the hydraulic transfer product (A &#0;) (see Example 1 of Japanese Patent Application No. 2003-409874 of Patent Document 4), the appearance of the decorative layer is deeper than that of a much better gloss. It was confirmed that it was granted.

  Further, when the adhesion between the decorative layer and the topcoat layer of the hydraulic transfer product obtained in each example was tested by a cross-cut tape method (100 mm cross of 1 mm cross-cut), all of the examples had the conventional activity. A conventional hydraulic transfer product without a top coat (B) having a printed pattern transferred by activation with an agent, or a conventional hydraulic transfer product with a top coat (C) having an acrylic resin top coat applied thereon, (C), Or it was confirmed that it has the adhesiveness equivalent to the hydraulic transfer product of each Example of Japanese Patent Application No. 2003-409874 which is patent document 4. FIG.

  On the other hand, as a solvent resistance test, when 10 sheets of gauze containing xylene were rubbed against the surface of the product by hand and wiped 8 times, all of the examples were top-coated with UV curable paint. It was confirmed to be equivalent to other conventional hydraulic transfer products (D) with a coat and exhibit good solvent resistance.

  In the above three embodiments, a transfer film in which a topcoat protective layer and a decorative ink pattern (printing pattern) are laminated is used, and the ink pattern is activated by applying an ultraviolet curable resin composition. In any of the examples, reproduction of adhesion between the ink pattern (printing pattern) and the topcoat protective layer, transfer of the ink pattern by the water pressure and the topcoat protective layer is performed. The main focus was to check the throwing power on the body (article) and whether the UV curable resin composition, the ink pattern, and the top coat layer could be integrated and cured on the transferred material by UV irradiation. As a result, there is still room for improvement in terms of surface gloss and surface smoothness. Things, by examining these types and their composition components, it should be understood that it is possible to impart further excellent surface gloss, mechanical strength, solvent resistance and the like.

  Adhesion can be reproduced on the transfer pattern printing pattern ink and topcoat protective layer without using organic solvents, which can cause problems such as air pollution and health problems of workers due to the use of organic solvents. In addition, the UV curable resin composition for imparting adhesion reproducibility and the printing pattern are naturally integrated, and at least the UV curable resin composition for imparting adhesion reproducibility and the topcoat layer are firmly integrated and cured. Therefore, a mechanical and chemical surface protective layer is well applied to the decorative layer of the article, and the adhesion between the top coat and the decorative layer is improved. As a result, depth is added to the surface appearance of the article and mechanical and chemical surface protection is further enhanced, thus increasing industrial applicability.

It is the schematic which shows the outline of the hydraulic transfer method used for this invention. FIG. 2A is a cross-sectional view of a transfer film, FIG. 2B is a cross-sectional view of a state in which an ultraviolet curable resin composition is applied to the transfer film, and FIG. 2C is a drawing. 2B is a cross-sectional view of a state where the transfer film of 2B is floated on the water surface, FIG. 2D is a cross-sectional view of a state immediately before pushing an article to be hydraulically transferred into water, and FIG. 2E is a cross-sectional view of a state of irradiating ultraviolet light after hydraulic transfer 2F is a cross-sectional view of a state in which a water-soluble film is washed from the article, and FIG. 2G is a cross-sectional view of a state in which the surface of the article is dried. It is an expanded sectional view of the product obtained by the method of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Article 10 'Product 12 Water-soluble film 14 Protective layer for topcoat 16 Printing pattern 18 Transfer film 20 Solvent-free UV curable resin composition 22 Water 24 UV 26 Water shower 28 Hot air 30 Decoration layer

Claims (10)

  In the method of hydraulically transferring the print pattern of a transfer film formed by sequentially applying a protective layer for top coat and a decorative print pattern on a water-soluble film to the surface of an article, the transfer film Applying a non-solvent type UV curable resin composition on a printed pattern and reproducing the adhesion of the printed pattern with a non-solvent activating component in the UV curable resin composition; and the UV curable resin composition, A step of pressing the article into the water together with the transfer film so as to press the surface of the article against the printed pattern, and thereby the decorative printing pattern containing the ultraviolet curable resin composition and the printing pattern thereon The article to which the protective layer for the top coat has been transferred is irradiated with ultraviolet rays to irradiate the ultraviolet curable resin composition, the printing pattern, and the ultraviolet curing. Water pressure transfer method characterized by at least a portion of the resin composition the protective layer in blended together of a state and a step of curing the ultraviolet-curable resin composition.   2. The hydraulic transfer method according to claim 1, wherein the non-solvent activating component in the ultraviolet curable resin composition that reproduces the adhesion of the printed pattern contains a photopolymerizable monomer. .   3. The hydraulic transfer method according to claim 1, wherein the topcoat protective layer is made of a transparent ink.   3. The hydraulic transfer method according to claim 1, wherein the topcoat protective layer is made of an ultraviolet curable resin composition. 5. The hydraulic transfer method according to claim 4, wherein the ultraviolet curable resin composition which is the protective layer for the top coat is of a solventless type.   6. The hydraulic pressure transfer method according to claim 1, wherein the step of irradiating the ultraviolet rays is performed while the water-soluble film of the transfer film is wound around the article. Transcription method.   3. The hydraulic transfer method according to claim 1, wherein the ultraviolet curable resin composition that reproduces the adhesion between the ultraviolet light and the printed pattern is an electron curable resin composition that is cured by an electron beam and an electron beam. A hydraulic transfer method, characterized in that there is.   7. The hydraulic transfer method according to claim 4, wherein the ultraviolet ray and the ultraviolet curable resin composition that is the protective layer for the topcoat are an electron beam and an electron curable resin that is cured by an electron beam. A hydraulic transfer method, which is a composition.   A hydraulic transfer product comprising a decorative layer formed by the hydraulic transfer method according to claim 1.   A decorative layer formed by the hydraulic transfer method according to any one of claims 1 to 8, wherein the decorative layer is eight-way wiping while rubbing ten layers of gauze containing xylene by hand. A hydraulic transfer product characterized in that it is not fouled by a solvent resistance test.

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