JP5660152B2 - Hard coat transfer film with adjustable peel strength and method for producing the same - Google Patents

Description

The present invention relates to a hard coat transfer film in which at least a release layer and a hard coat layer are sequentially laminated on a plastic film and the peel strength can be adjusted, and a method for producing the hard coat transfer film.

Conventionally, various products such as home appliances, furniture surface materials, automobile parts, miscellaneous goods, paper containers, labels, etc. have functionalities such as metallic luster, designs such as designs, hard coat properties, and antireflection properties. For the purpose of imparting, a transfer film in which a metal thin film layer, a printing layer, a colored layer, an adhesive layer, etc. (hereinafter sometimes collectively referred to as a transfer layer) is laminated on a plastic film is used. A method is widely used in which a laminated transfer layer is transferred to the above-mentioned various product surfaces (transfer object surfaces) and laminated to obtain various products imparted with designability and functionality.

In general, the transfer film is manufactured to be wide and long, and the transfer film is slit and used in accordance with the size and shape of the transfer object.

In addition, when the transfer film is slit, the transfer layer laminated in the vicinity of the slit portion of the transfer film is liable to cause so-called foil spillage that is peeled off from the plastic film. For this reason, the spilled transfer layer may “splatter into the slitting chamber”, “attach to the transfer film”, etc. When performing transfer processing using a transfer film, there has been a problem that a transfer layer spilled from the plastic film is liable to cause appearance defects due to adhesion to the surface of the transfer object.

Patent Document 1 discloses a transfer foil (transfer film) in which a release layer and an ionizing radiation curable resin layer (transfer layer) are sequentially laminated on a base material. The process of laminating the radiation curable resin layer sequentially, irradiating only the slit part of the transfer foil (transfer film) with ionizing radiation (ultraviolet rays) to increase the peeling force between the release layer and the ionizing radiation curable resin layer (strongly ), A method for producing a transfer foil (transfer film) that prevents foil spillage comprising the step of slitting at the slit portion, and on the release layer, in addition to the ionizing radiation curable resin layer, It is described that a protective layer, a printing layer, various functional layers, an adhesive layer, and the like may be provided as a transfer layer.

In addition, a conventional general transfer film in which at least a release layer and a transfer layer (printing layer, metal thin film layer, etc.) are sequentially laminated on a plastic film requires a peel strength between the release layer and the transfer layer. It is difficult to adjust the peel strength of the transfer film, and it is difficult to transfer the transfer layer laminated on the transfer film cleanly onto the surface of the transfer object. There was a problem.

In this specification, the appearance defect means that when a transfer film is used for transfer processing, it is not transferred to the surface of the transfer object, regardless of whether the transfer film is slit or non-slit. The transfer layer where it should remain laminated on the release layer is spilled from the plastic film (on the release layer), and the spilled transfer layer adheres to the surface of the transfer object. This refers to a problem in which a desired appearance and function cannot be obtained. Specifically, the problem is the following problem (1) or (2). The above appearance defects often occur when the peel strength between the transfer film plastic film (release layer) and the transfer layer is relatively weak.
(1) A defect in which a transfer layer with a spilled foil adheres to a portion of the surface of the transferred material on which the transfer layer should not be laminated, and a desired appearance and function cannot be obtained.
(2) The spilled transfer layer adheres to the surface of the transfer object, and the target transfer layer is further laminated on the spilled transfer layer attached to the transfer object surface. As a result, the transfer object is transferred. The transfer layer laminated on the surface swells in the shape of a spilled transfer layer attached to the surface of the transfer object, and the desired appearance and function cannot be obtained.

In addition, the transfer defect referred to in the present specification means that when transfer processing is performed using a transfer film, the transfer layer is transferred and laminated on the surface of the transfer object in a state in which a part or all of the transfer layer is missing. This means that the appearance and function cannot be obtained, and specifically, the following (1) or (2).
(1) Of the transfer layer laminated on the transfer film, a part or all of the transfer layer that should originally be laminated on the surface of the transfer object is transferred onto the plastic film (released) before being transferred to the transfer object surface. The foil spills from the mold layer) and is laminated on the surface of the transfer object in a state in which a part or all of the transfer layer is missing, so that the desired appearance and function cannot be obtained. This defect often occurs when the peel strength between the transfer film plastic film (release layer) and the transfer layer is relatively weak.
(2) Of the transfer layer laminated on the transfer film, a part or all of the transfer layer that should be laminated on the surface of the transfer object is peeled off from the plastic film (on the release layer). First, the transfer layer is laminated on the surface of the transfer object in a state where a part or all of the transfer layer is missing on the transfer object surface (hereinafter, such a state is referred to as foil chipping) to obtain a desired appearance and function. A bug that cannot be done. This defect often occurs when the peel strength between the transfer film plastic film (release layer) and the transfer layer is relatively strong.

JP 2012-11711 A

However, the method for producing a transfer foil (transfer film) described in Patent Document 1 increases the peel strength between the release layer of the slit part and the ionizing radiation curable resin layer (transfer layer) in order to prevent foil spillage in the slit part. For the purpose of (strengthening), it is necessary to irradiate only the slit portion of the transfer film having a width of about 5 to 15 mm with ionizing radiation (ultraviolet rays). The manufacturing method and the transfer foil (transfer film) obtained by the manufacturing method There were the following drawbacks.

(1). The manufacturing method of the transfer foil (transfer film) described in Patent Document 1 irradiates the non-slit portion with ultraviolet rays according to the shape of the slit portion so that the ultraviolet rays are irradiated only to the slit portion of the transfer foil (transfer film). In order to prevent this, a cover, a jig, etc. for shielding ultraviolet rays had to be produced each time. In general, the width of the slit portion and the non-slit portion of the transfer film varies depending on the size and shape of the transfer object. Therefore, when manufacturing a transfer foil (transfer film) by the manufacturing method described in Patent Document 1, There was a drawback that it was very troublesome and it was difficult to produce a transfer film efficiently.

(2) The transfer foil (transfer film) obtained by the production method described in Patent Document 1 has a peel strength between the release layer of the non-slit portion of the transfer foil (transfer film) and the ionizing radiation curable resin layer (transfer layer). Since the film cannot be adjusted to a desired peel strength, the transfer layer in the non-slit portion is spilled or crushed, resulting in defects in appearance and transfer.

The general transfer film in which at least a release layer and a transfer layer are sequentially laminated on a plastic film has a release layer in order to obtain a desired peel strength between the release layer and the transfer layer. For example, the peel strength between the release layer and the transfer layer had to be adjusted to an optimum peel strength by changing the type of resin used. However, with such a method, the peel strength between the release layer and the transfer layer is used for the release layer each time so that the peel strength between the release layer and the transfer layer becomes an optimum peel strength that does not cause appearance defects or transfer defects depending on the size and shape of the transfer object. It is necessary to select a resin to be used, which is very troublesome and inefficient and has practical problems.

Then, the transfer foil (transfer film) obtained by the production method described in Patent Document 1 or the general transfer film is placed on a plastic film (on a release layer) as an ionizing radiation curable resin layer, printing When the layer, metal thin film layer, adhesive layer, etc. are combined and laminated, these transfer films tend to cause foil spillage more easily, and the release layer and the transfer layer are peeled off. It was difficult to adjust the strength to the optimum peel strength.

From the above, it is a transfer film in which at least a transfer layer such as a release layer and a hard coat layer is laminated on a plastic film, regardless of the slit part or the non-slit part. It is possible to easily adjust the peel strength of the transfer film to an optimum peel strength, and to provide a transfer film that does not cause appearance defects or transfer defects without causing the transfer layer to spill or foil, and a method for producing the same It was a challenge.

[1] The present invention is a hard coat transfer film in which at least a release layer and a hard coat layer made of an ultraviolet curable resin are sequentially laminated on a plastic film, and the following (A) to (C) A hard coat transfer film characterized by satisfying all of the above conditions.
(A) The release layer and the hard coat layer are laminated so that they are in contact with each other. (B) The release layer is any of a polyester resin, an acrylic resin, a urethane resin, a melamine resin, and an epoxy resin. Or a layer composed of one or two or more thermosetting resins and pentaerythritol triacrylate .
(C) The weight ratio of pentaerythritol triacrylate to the thermosetting resin is 3 to 10% by weight. [2] In the present invention, the peel strength between the release layer and the hard coat layer is 0.05 to 0.5 N. The hard coat transfer film according to claim 1, which is / 18 mm.
[3] The present invention is a thermosetting resin comprising at least one of a polyester resin, an acrylic resin, a urethane resin, a melamine resin, and an epoxy resin on a plastic film. Is a method for producing a hard coat transfer film in which a release layer composed of pentaerythritol triacrylate and a hard coat layer composed of an ultraviolet curable resin are sequentially laminated, comprising the following (Step 1) and (Step 2): A method for producing a hard coat transfer film, which is sequentially performed.
(Process 1) Thermosetting resin and pentaerythritol triacrylate comprising one or more of polyester resin, acrylic resin, urethane resin, melamine resin, and epoxy resin on plastic film And coating the mixed resin in which the weight ratio of pentaerythritol triacrylate to the thermosetting resin is 3 to 10% by weight, and then heating the mixed resin to cure at least the thermosetting resin and releasing the mold. Step of laminating layers (Step 2) Coating the UV curable resin on the release layer, irradiating at least a portion coated with the UV curable resin, and curing the UV curable resin Laminating the hard coat layer

The hard coat transfer film of the present invention is a hard coat transfer film that can solve all of the above-mentioned problems, and the method of manufacturing the hard coat transfer film of the present invention is optimal for manufacturing the hard coat transfer film of the present invention. It is a simple manufacturing method.

In the hard coat transfer film of the present invention, the laminated release layer is composed of a thermosetting resin and a hydroxyl group-containing acrylate, and the weight ratio of the hydroxyl group-containing acrylate to the thermosetting resin is 3 to 10% by weight. Therefore, the peel strength between the release layer and the hard coat layer can be easily adjusted to the optimum peel strength.

The hard coat transfer film of the present invention has a non-slit portion and a peel strength between the release layer and the hard coat layer laminated on the hard coat transfer film of the present invention regardless of the slit portion. Regardless, it is possible to easily adjust to the optimum peel strength.
Further, in order to prevent the hard coat layer in the slit portion of the hard coat transfer film of the present invention from spilling, it is not necessary that only the slit portion is irradiated with ultraviolet rays. Therefore, when the hard coat transfer film of the present invention is produced, it is not necessary to produce a cover or jig for shielding ultraviolet rays in accordance with the shape of the non-slit portion and the slit portion, and the hard coat of the present invention is very efficiently produced. A coat transfer film can be obtained.

Furthermore, since the hard coat transfer film of the present invention can easily adjust the peel strength between the release layer and the hard coat layer to the optimum peel strength, regardless of the slit portion and the non-slit portion, The hard coat layer laminated on the hard coat transfer film of the present invention is not spilled or crushed. Therefore, when the hard coat transfer film of the present invention is used, the hard coat layer can be transferred and laminated in a desired shape on the surface of the transfer object at a desired location. Therefore, appearance defects and transfer defects do not occur due to foil spilling on the hard coat layer that is not transferred to the surface of the transfer object, and transfer defects also occur due to part or all of the hard coat layer being foil-foiled. There is nothing.

Further, the hard coat transfer film of the present invention has a peel strength between the release layer and the hard coat layer even when the transfer layer such as a hard coat laminated on the release layer is laminated. It is possible to easily adjust to the optimum peel strength.

As described above, the hard coat transfer film of the present invention can easily adjust the peel strength between the release layer and the hard coat layer to an optimum peel strength.

Specifically, the optimum peel strength between the release layer and the hard coat layer of the hard coat transfer film of the present invention is in the range of 0.05 to 0.5 N / 18 mm, preferably 0.05 to 0.15 N / When the hard coat transfer film of the present invention is used to transfer and laminate at least the hard coat layer laminated on the hard coat transfer film of the present invention onto the surface of the transferred material Regardless of the size, shape, etc., the hard coat layer is not spilled or crushed, so that appearance defects and transfer defects do not occur. Moreover, the hard coat transfer film of the present invention can easily adjust the peel strength to a desired peel strength within the range of the optimum peel strength.

In order to obtain the hard coat transfer film of the present invention, it is optimal to use the production method of the present invention.
The method for producing a hard coat transfer film of the present invention comprises a mixed resin comprising a hydroxyl group-containing acrylate and a thermosetting resin on a plastic film, wherein the weight ratio of the hydroxyl group-containing acrylate to the thermosetting resin is 3 to 10% by weight. After coating, the mixed resin is heated, the thermosetting resin is cured, a release layer is laminated, an ultraviolet curable resin layer made of an ultraviolet curable resin is coated on the release layer, and at least This is a method for producing a hard coat transfer film in which a portion coated with the ultraviolet curable resin is irradiated with ultraviolet rays, the ultraviolet curable resin is cured, and a hard coat layer is laminated.
Therefore, as described above, it is not necessary to prepare a cover, a jig, or the like that shields ultraviolet rays so that ultraviolet rays are not irradiated to the non-slit portions in accordance with the shape of the slit portions in order to prevent foil spillage in the slit portions. Therefore, if the method for producing a hard coat transfer film of the present invention is used, the hard coat transfer film of the present invention can be obtained very efficiently.
Also, the method for producing a hard coat transfer film of the present invention comprises a step of laminating at least a release layer on a plastic film, coating the release layer with an ultraviolet curable resin, and then irradiating the ultraviolet ray with ultraviolet light. In addition to curing the mold resin and laminating the hard coat layer, the hard coat layer not only has the desired hard coat properties, but also contains the hydroxyl group-containing acrylate used for the release layer and the UV cure used for the hard coat layer. The peel strength between the release layer and the hard coat layer is optimized by cross-linking with the mold resin (in the range of 0.05 to 0.5 N / 18 mm, preferably in the range of 0.05 to 0.15 N / 18 mm) ) Can be easily adjusted.
Therefore, the hard coat transfer film obtained by the method for producing a hard coat transfer film of the present invention does not cause the hard coat layer to spill or foil, so that appearance defects and transfer defects do not occur.

The hard coat transfer film of the present invention is a hard coat transfer film in which at least a release layer and a hard coat layer made of an ultraviolet curable resin are sequentially laminated on a plastic film, and the following (A) to ( A hard coat transfer film characterized by satisfying all the conditions of C).
(A) The release layer and the hard coat layer are laminated so that they are in contact with each other. (B) The release layer is a layer composed of a thermosetting resin and a hydroxyl group-containing acrylate. The weight ratio of the hydroxyl group-containing acrylate is 3 to 10% by weight.

Further, when the hard coat transfer film of the present invention is used to transfer and laminate at least the hard coat layer laminated on the hard coat transfer film of the present invention onto the surface of the transfer object, the hard coat of the present invention The release layer laminated on the transfer film is peeled off together with the plastic film, and at least a hard coat layer is transferred and laminated on the surface of the transfer object.

Hereinafter, the hard coat transfer film of the present invention will be described.

The plastic film used for the hard coat transfer film of the present invention is not particularly limited, and various conventionally known plastic films such as polyethylene terephthalate film, polycarbonate film, polyethylene film, polypropylene film, polyamide film and the like can be used.

The plastic film may be non-stretched, uniaxially stretched, or biaxially stretched, and may contain various additives such as an antistatic agent, a colorant, and a heat stabilizer.
What is necessary is just to select suitably the kind and thickness of a plastic film according to a desired use and the objective.
Furthermore, for the purpose of making various products obtained by using the hard coat transfer film of the present invention rich in design, the plastic film is subjected to hairline processing, mat processing, embossing, etc. on the surface of the plastic film. May be.

In addition, the plastic film may be subjected to surface treatment such as anchor coating, easy adhesion coating, corona treatment on the plastic film for the purpose of strengthening the adhesion between the plastic film and the release layer. The plastic film thus produced is also included in the plastic film referred to in this specification.

The release layer of the hard coat transfer film of the present invention is a release layer of the hard coat transfer film of the present invention when at least the hard coat layer laminated on the release layer is transferred and laminated on the surface of the transfer object. It is a layer laminated on a plastic film for the purpose of facilitating peeling from above.

The release layer is a layer composed of a thermosetting resin and a hydroxyl group-containing acrylate, and the thermosetting resin used for the release layer is not particularly limited as long as it can achieve the above-mentioned purpose. Various known resins such as polyethylene resins, polypropylene resins, polystyrene resins, vinyl chloride resins, polyester resins, acrylic resins, urethane resins, melamine resins, and epoxy resins can be used. One type or two or more types of mixed resins may be used, and may be appropriately selected according to the purpose.

The hydroxyl group-containing acrylate used for the release layer can be used without particular limitation, but the peel strength between the release layer and the hard coat layer of the hard coat transfer film of the present invention can be adjusted within the range of the optimum peel strength. It is preferred to use easy pentaerythritol triacrylate.

The weight ratio of the hydroxyl group-containing acrylate to the thermosetting resin is preferably in the range of 3 to 10% by weight, more preferably 3 to 5% by weight. If the weight ratio of the hydroxyl group-containing acrylate to the thermosetting resin is in the above range, the hard coat transfer film of the present invention can be applied to the release layer of the hard coat transfer film of the present invention regardless of the slit portion and the non-slit portion. It becomes possible to adjust the peel strength with the hard coat layer to an optimum peel strength, and the hard coat layer does not cause spilling or splattering of the foil, causing no appearance trouble or transfer trouble.

If the weight ratio of the hydroxyl group-containing acrylate to the thermosetting resin is less than 3% by weight, the peel strength between the release layer and the hard coat layer will be weak, and the hard coat layer will spill out of the foil, resulting in defects in appearance, etc. It is not preferable because it is easy to cause. Further, if the weight ratio of the hydroxyl group-containing acrylate to the thermosetting resin is more than 10% by weight, the peel strength between the release layer and the hard coat layer becomes strong, and the hard coat layer causes foil chipping, resulting in transfer. This is not preferable because it tends to cause defects.

Further, the peel strength between the release layer and the hard coat layer of the hard coat transfer film of the present invention is the weight ratio of the hydroxyl group-containing acrylate to the thermosetting resin, regardless of the type of the thermosetting resin used in the release layer. The peeling strength increases as the weight ratio of the hydroxyl group-containing acrylate to the thermosetting resin increases, and the weight ratio of the hydroxyl group-containing acrylate to the thermosetting resin depends on the size and shape of the transfer object. What is necessary is just to adjust suitably so that it may become the range of the said optimal peel strength so that it may become desired peel strength collectively.

The thickness of the release layer is preferably in the range of 0.5 to 2 μm. If the thickness of the release layer is less than 0.5 μm, the peel strength between the release layer and the hard coat layer will increase, and the hard coat layer may cause foil chipping, resulting in a transfer failure. It is not preferable, and if it is thicker than 2 μm, cohesive failure may occur in the release layer when transfer processing is performed, and part of the release layer may be transferred to the surface of the transfer object, which is not preferable.
In addition, as a method for laminating the release layer, a conventionally known coating method such as a gravure coating method, a reverse coating method, a die coating method, a micro gravure coating (reverse gravure coating) method can be used, and it is appropriately selected according to a desired purpose. do it.

The hard coat layer laminated on the hard coat transfer film of the present invention is a layer made of an ultraviolet curable resin laminated on the release layer so as to be in contact with the release layer. When transfer processing is performed using a coat transfer film, the layer is peeled off from the release layer of the hard coat transfer film of the present invention and transferred and laminated on the surface of the transfer object.
That is, the hard coat layer is a layer in which an ultraviolet curable resin is cured by irradiation of ultraviolet rays. When the hard coat transfer film of the present invention is used for transfer processing, the hard coat layer is the outermost layer of the transfer object. It is a layer that is laminated and imparts hard coat properties to the transfer object on which the hard coat layer is laminated.

In addition, the hard coat layer is in a state in which all of the ultraviolet curable resin reacts with ultraviolet rays and is completely cured (completely cured), or a part of the ultraviolet curable resin reacts with ultraviolet rays and is not completely cured (half-finished). It is possible to select whether the ultraviolet curable resin is to be completely cured or semi-cured according to the purpose.

When the transfer process is performed using the hard coat transfer film of the present invention, the transfer object surface on which the hard coat layer is laminated has a desired hard coat property. The hard coat layer laminated on the substrate needs to be completely cured. A method for transferring and laminating on the surface of the transfer object using the hard coat transfer film of the present invention will be described later.

The ultraviolet curable resin used for the hard coat layer is not particularly limited as long as it is an ultraviolet curable resin that can achieve the above-mentioned purpose, and various known resins such as acrylic resins and urethane resins can be used. Any one kind or two or more kinds of mixed resins may be used, and may be appropriately selected according to the purpose.

The thickness of the hard coat layer may be any thickness as long as the hard coat layer laminated on the hard coat transfer film of the present invention can be transferred, and the laminated transfer object can obtain a desired hard coat property. A range of 3 to 10 μm is preferred. If the thickness of the hard coat layer is less than 3 μm, it may not be possible to impart desired hard coat properties to the transferred material to which the hard coat layer has been transferred. On the other hand, if the thickness of the hard coat layer is more than 10 μm, it is not preferable because a crack may occur in the hard coat layer when the transfer process is performed, resulting in poor appearance.

In addition, a conventionally known coating method such as a gravure coating method, a reverse coating method, a die coating method, or a micro gravure coating (reverse gravure coating) method can be used as a method of laminating a hard coat layer, and it is appropriately selected according to a desired purpose. do it.

The hard coat transfer film of the present invention is a hard coat layer laminated on the hard coat transfer film of the present invention for the purpose of providing various products obtained using the hard coat transfer film of the present invention with design properties. A printed layer, a colored layer, a metal thin film layer, or the like may be laminated thereon, and for the purpose of closely adhering the hard coat transfer film of the present invention and the material to be transferred, from a thermoplastic resin, an adhesive resin, or the like. The adhesive layer to be formed may be laminated on the hard coat layer (printed layer, colored layer, metal thin film layer, etc.).
The printed layer, the colored layer, the metal thin film layer, the adhesive layer, and the like are transfer layers that are transferred and laminated on the surface of the transfer object together with the hard coat layer laminated on the hard coat transfer film of the present invention. Will be described in detail.

Further, when the hard coat transfer film of the present invention is formed by laminating a printed layer, a colored layer, a metal thin film layer, an adhesive layer, etc. on the hard coat layer, the hard coat layer and these layers (in contact with the hard coat layer) An anchor coat layer may be laminated on the hard coat layer for the purpose of strengthening the close contact with the layer). The anchor coat layer is also included in the transfer layer referred to in this specification.

The print layer and the colored layer are layers laminated on the hard coat layer for the purpose of imparting design properties to various products obtained using the hard coat transfer film of the present invention as described above.
In addition, the resin used for the printing layer and the colored layer is various known, such as polyethylene resin, polypropylene resin, polystyrene resin, vinyl chloride resin, polyester resin, acrylic resin, urethane resin, melamine resin, etc. Any one of these, or a mixed resin of two or more thereof may be used, and may be appropriately selected according to the purpose of the printing layer and the colored layer. Moreover, when it is set as the multiple layer (henceforth a printing layer etc.) which combined two or more layers with the printing layer and the coloring layer, resin used for a printing layer etc. may differ between each layer, and may be the same kind. Good.
All the layers constituting the printing layer or the like may be laminated on the hard coat layer entirely or partially, and some of the layers constituting the printing layer etc. may be entirely or partially laminated. It may be laminated on the hard coat layer. Moreover, what layer should be made into the whole surface or a part among the layers which comprise a printing layer etc. should just be suitably selected according to desired design property. Moreover, the method of laminating | printing a printing layer and a colored layer can use a conventionally well-known laminating method, and should just select suitably according to the objective.

The metal thin film layer is laminated on the hard coat layer for the purpose of imparting functions such as metallic luster, conductivity, antireflection, and antibacterial properties to the transfer object obtained using the hard coat transfer film of the present invention. Is the layer to be played.

As the material used for the metal thin film layer, various metals such as aluminum, chromium, tin, gold, silver, copper, nickel, indium, zinc sulfide, and silicon or compounds thereof can be used. A conventionally known method of laminating a metal thin film layer, such as a vacuum deposition method, a sputtering method, or a CVD method, can be used.
What is necessary is just to select suitably the kind of material used for a metal thin film layer, and the method of laminating | stacking a metal thin film layer according to the desired objective. Further, the thickness of the metal thin film layer may be a thickness that provides a desired metallic luster and function, and may be appropriately selected according to the desired metallic luster and function.

In addition, a top coat layer made of a conventionally known resin may be laminated on the metal thin film layer for the purpose of preventing oxidation or scratching of the metal thin film layer. The resin used for the topcoat layer, the thickness of the topcoat layer, and the method of laminating can be used without particular limitation, and may be appropriately selected according to the desired purpose. The top coat layer is also included in the transfer layer referred to in this specification.

The metal thin film layer may be a single layer or a plurality of layers of two or more layers. When two or more layers of the metal thin film layers are used, the materials used for each layer may be different or may be the same. . Further, all the layers constituting the metal thin film layer may be laminated on the entire surface or part of the hard coat layer, and any layer constituting the metal thin film layer may be entirely or partially on the hard coat layer. It may be laminated. A method for partially laminating the metal thin film layer may be selected as appropriate, such as a conventionally known etching method.

Further, the hard coat transfer film of the present invention may of course be laminated by combining the printed layer, the colored layer, and the metal thin film layer. In that case, any of the printed layer, the colored layer, and the metal thin film layer may be used. These layers may be the lower layer (hard coat layer side), and the order and combination may be appropriately selected according to the desired purpose.

The adhesive layer is a layer made of a thermoplastic resin, an adhesive resin, or the like for the purpose of bringing the hard coat transfer film of the present invention into contact with the transfer object, and on the hard coat layer (printing layer, colored layer, metal thin film). It is a layer that is stacked on top of the layer.
The type of resin used for the adhesive layer and the method of laminating can be used without particular limitation as long as they can achieve the above-mentioned purpose, and the resin used depending on the type and purpose of the transferred material and laminating. A method may be selected as appropriate. In addition, the thickness of the adhesive layer may be appropriately selected so that the hard coat transfer film of the present invention and the transfer target can be brought into close contact with each other.

Further, by laminating the adhesive layer, it becomes possible to easily adhere the hard coat transfer film of the present invention and the transfer object, and at least the hard coat layer laminated on the hard coat transfer film of the present invention, It becomes easy to transfer it onto the transfer object together with the adhesive layer.
When the above-mentioned adhesive layer is laminated on the hard coat transfer film of the present invention, the adhesive layer is laminated on the outermost layer (hard coat layer side) of the hard coat transfer film of the present invention. It becomes. In this case, it goes without saying that the print layer, the colored layer, and the metal thin film layer may be laminated between the hard coat layer and the adhesive layer laminated on the hard coat transfer film of the present invention.

The material to be transferred on which at least the hard coat layer laminated on the hard coat transfer film of the present invention is transferred is particularly limited to the material of the material to be transferred, such as a molded product made of glass, metal, earthenware, resin, paper, fabric, etc. The shape of the transferred material can also be used without particular limitation, such as a plate shape, a film shape, a sheet shape, or a shape that has been pre-formed into a desired shape, and is appropriately selected depending on the purpose. Just choose.

In the method of transferring and laminating at least the hard coat layer (transfer layer) laminated on the hard coat transfer film of the present invention to the surface of the transfer object, the hard coat transfer film of the present invention and the transfer object are adhered to each other. After that, by separating the plastic film of the hard coat transfer film together with the release layer, the transfer layer can be used without particular limitation as long as the transfer layer can be transferred and laminated on the surface of the transfer object. What is necessary is just to select suitably according to purposes, such as a hot stamp method and a simultaneous molding transfer method (in-mold molding method).
In addition, a transfer material in which an adhesive layer is previously laminated on the surface is used, and the hard coat transfer film of the invention in which the adhesive layer is not laminated, or the hard coat transfer film of the invention in which the adhesive layer is laminated. The transfer layer may be transferred and laminated.

When the transfer process is performed using the hard coat transfer film of the present invention, the transfer object on which the hard coat layer is laminated is laminated on the transfer object surface in order to have a desired hard coat property. It is necessary to make the hard coat layer that has been completely cured by the ultraviolet curable resin.
In order to make the hard coat layer laminated on the surface of the transfer object completely cured by the ultraviolet curable resin, the hard coat layer obtained by completely curing the hard coat transfer film of the present invention with the ultraviolet curable resin is used. What is necessary is just to transfer and laminate | stack this hard-coat layer on the transcription | transfer material surface. Alternatively, the hard coat transfer film of the present invention may have a defective appearance due to cracks in the hard coat layer laminated on the surface of the transfer object during transfer processing due to the shape of the transfer object. The hard coat layer may be semi-cured with an ultraviolet curable resin, and after the hard coat layer is laminated on the surface of the transfer object, the ultraviolet curable resin may be completely cured by irradiating with ultraviolet rays.

The hard coat transfer film of the present invention is capable of easily adjusting the peel strength between the release layer and the hard coat layer laminated on the hard coat transfer film within the optimum peel strength range. It can be easily obtained by using a manufacturing method of a hard coat transfer film, and is an optimal manufacturing method.

Hereinafter, a method for producing the hard coat transfer film of the present invention will be described.

Specifically, the method for producing a hard coat transfer film of the present invention includes the following (Step 1) and (Step 2) in order, so that at least a thermosetting resin and a hydroxyl group-containing acrylate are formed on the plastic film. A hard coat transfer film in which a release layer and a hard coat layer made of an ultraviolet curable resin are sequentially laminated can be manufactured.
(Step 1) A plastic film is coated with a mixed resin composed of a thermosetting resin and a hydroxyl group-containing acrylate, and the weight ratio of the hydroxyl group-containing acrylate to the thermosetting resin is 3 to 10% by weight. Step of heating resin and curing at least thermosetting resin to laminate release layer (Step 2) On the release layer, an ultraviolet curable resin is coated, and at least the ultraviolet curable resin is coated. A step of irradiating a portion of the substrate with ultraviolet rays, curing the ultraviolet curable resin, and laminating a hard coat layer

If the method for producing a hard coat transfer film of the present invention is used, the peel strength between the release layer and the hard coat layer laminated on the hard coat transfer film can be adjusted within the optimum peel strength range. The hard coat transfer film can be easily obtained.

The method for producing a hard coat transfer film according to the present invention irradiates at least a portion coated with an ultraviolet curable resin with ultraviolet rays, and as described above, a cover that shields ultraviolet rays according to the shape of the non-slit portion and the slit portion. The hard coat transfer film of the present invention can be obtained very efficiently without the need to produce a jig or jig.
Note that irradiating at least the part coated with UV curable resin with ultraviolet rays is not only irradiating only the part coated with UV curable resin, but also UV rays are coated with UV curable resin. Irradiation to the entire surface of the hard coat transfer film including the non-existing portion is also included.

The method for producing a hard coat transfer film of the present invention comprises a step of laminating a release layer comprising a thermosetting resin and a hydroxyl group-containing acrylate on a plastic film, and curing the thermosetting resin by heating. The hard coat layer not only has a desired hard coat property by laminating a hard coat layer made of an ultraviolet curable resin on the release layer and irradiating with ultraviolet rays, but also the release layer and the hard coat layer It is easy to adjust the peel strength to the optimum peel strength.

Therefore, the hard coat transfer film obtained by using the method for producing a hard coat transfer film of the present invention is one in which the peel strength between the release layer and the hard coat layer is adjusted to the optimum peel strength. The coating layer is not spilled or crushed, causing no appearance defects or transfer defects. Further, it is preferable to use pentaerythritol triacrylate as the hydroxyl group-containing acrylate used in the release layer because it is easier to set the peel strength between the release layer and the hard coat layer within the optimum range.

The peel strength between the release layer and the hard coat layer of the hard coat transfer film of the present invention is such that the weight ratio of the hydroxyl group-containing acrylate to the thermosetting resin and the ultraviolet ray are irradiated so that the hydroxyl group-containing acrylate and the hard layer of the release layer are irradiated. It is determined by crosslinking with the UV curable resin of the coating layer. The amount of ultraviolet irradiation will be described later.

Specifically, the optimum peel strength between the release layer and the hard coat layer of the hard coat transfer film of the present invention is preferably in the range of 0.05 to 0.5 N / 18 mm, and 0.05 to 0.15 N / If it is within the range of the above optimum peel strength, at least the hard coat layer of the hard coat transfer film of the present invention is spilled or crushed regardless of the size or shape of the transfer object. No appearance defects and transfer defects.

Hereinafter, the respective steps of the method for producing a hard coat transfer film of the present invention will be described.

(Step 1) of the method for producing a hard coat transfer film of the present invention comprises a thermosetting resin and a hydroxyl group-containing acrylate on a plastic film, and the weight ratio of the hydroxyl group-containing acrylate to the thermosetting resin is 3 to 10. In this process, after coating the mixed resin of wt%, the mixed resin is heated to cure at least the thermosetting resin and laminate the release layer.
The same plastic film as that used in the above-mentioned hard coat transfer film of the present invention can be used and the plastic film to be used may be appropriately selected according to the purpose.

The thermosetting resin used for the release layer, the kind of the hydroxyl group-containing acrylate, and the weight ratio of the hydroxyl group-containing acrylate to the thermosetting resin are also the same as those used in the hard coat transfer film of the present invention described above. The method of coating the mixed resin and the thickness of the release layer may be appropriately selected according to the desired purpose.

In addition, the processing conditions such as processing speed and processing temperature when coating the mixed resin can achieve the purpose of the release layer, and the release layer is cured by curing the thermosetting resin of the mixed resin. What is necessary is just to select suitably so that it may become the process conditions which can be laminated | stacked.

(Step 2) of the method for producing a hard coat transfer film of the present invention is such that ultraviolet light is applied to at least a portion where the ultraviolet curable resin is coated on the release layer laminated on the plastic film in (Step 1). It is a step of irradiating and curing the ultraviolet curable resin to laminate a hard coat layer.
As used herein, curing an ultraviolet curable resin means that the ultraviolet curable resin is completely cured by reacting with all ultraviolet curable resin (completely cured), or a part of the ultraviolet curable resin. Is made to react with ultraviolet light to make it not completely cured (semi-cured), and the UV curable resin can be appropriately cured or selected depending on the purpose. .

In addition, the ultraviolet curable resin is cured by irradiating ultraviolet rays, and the hydroxyl group-containing acrylate of the release layer and the ultraviolet curable resin of the hard coat layer are cross-linked so that the peel strength between the release layer and the hard coat layer is obtained. Is a step of finally determining

The kind of UV curable resin used for the hard coat layer, the method of coating the UV curable resin, and the thickness of the hard coat layer can be the same as those used in the hard coat transfer film of the present invention described above. .
Moreover, what is necessary is just to select the processing conditions which can achieve the said objective of a hard-coat layer suitably for processing conditions, such as a processing speed and the irradiation amount of an ultraviolet-ray, when coating an ultraviolet curable resin.

As described above, the peeling strength between the release layer and the hard coat layer laminated on the hard coat transfer film of the present invention is released by irradiating the weight ratio of the hydroxyl group-containing acrylate to the thermosetting resin and ultraviolet rays. The hydroxyl group-containing acrylate of the layer and the UV curable resin are cross-linked, and the amount of UV irradiation is the desired peel strength within the range of the optimum peel strength between the release layer and the hard coat layer. and may be suitably selected to be, but preferably is 10 mJ / cm ² or more, the range of 10 to 100 mJ / cm ² is more preferable.
If the irradiation amount of ultraviolet rays is less than 10 mJ / cm ² , the ultraviolet curable resin may be coherently broken, which is not preferable. Further, when the irradiation amount of the ultraviolet rays is more than 100 mJ / cm ² , as described above, after performing the transfer processing, the ultraviolet ray irradiation resin is irradiated to completely cure the ultraviolet curable resin laminated on the surface of the transfer object. When the transfer process is performed using the hard coat transfer film of the present invention in which the UV curable resin is semi-cured, the UV curable resin is cured more than the desired cured state. Further, it is not preferable because cracks may occur in the hard coat layer laminated on the surface of the transfer object, and appearance defects may easily occur.

When the ultraviolet ray is irradiated, the ultraviolet ray curable resin is cured as desired, and the hydroxyl group-containing acrylate of the release layer and the ultraviolet ray curable resin of the hard coat layer are cross-linked to form a release layer and a hard coat layer. If an optimum peel strength can be obtained, the ultraviolet ray may be irradiated from either the hard coat layer side, the plastic film side, or both sides, and the time for the ultraviolet ray irradiation may also be applied to the ultraviolet curable resin. What is necessary is just to adjust irradiation conditions suitably so that the irradiation amount of the ultraviolet-ray irradiated may be 10 mJ / cm < ² > or more reliably, More preferably, it is the range of 10-100 mJ / cm < ² >.

As described above, the hard coat transfer film of the present invention is a hard coat transfer film in which at least a release layer and a hard coat layer are sequentially laminated on a plastic film, and the release layer is combined with a thermosetting resin. By forming a layer comprising a hydroxyl group-containing acrylate and having a weight ratio of the hydroxyl group-containing acrylate to the thermosetting resin of 3 to 10% by weight, the peel strength between the release layer and the hard coat layer can be reduced. It is a hard coat transfer film that can be adjusted to an optimum peel strength according to the size and shape. Therefore, the hard coat layer does not spill over or peel off from the release layer of the hard coat transfer film of the present invention, and at least the hard coat layer is formed on the surface of the transfer object using the hard coat transfer film of the present invention. When transferring and laminating the film, appearance defects and transfer defects do not occur.
Furthermore, it is perfectly possible to use pentaerythritol triacrylate as the hydroxyl group-containing acrylate used in the release layer of the hard coat transfer film of the present invention.

Further, the method for producing a hard coat transfer film of the present invention makes it easy to reliably adjust the peel strength between the release layer and the hard coat layer of the hard coat transfer film to an optimum peel strength. This is an optimum production method for obtaining a hard coat transfer film.

[Example 1]
The following steps (step A) to (step C) were sequentially performed to obtain a hard coat transfer film of the present invention in which a release layer, a hard coat layer, and an adhesive layer were sequentially laminated on a plastic film.
(Step A) 100 parts by weight of a thermosetting resin (TM-REX EM-5 manufactured by Dainichi Seika Kogyo Co., Ltd.) in which an epoxy resin and a melamine resin are mixed on the entire surface of one side of a polyethylene terephthalate film having a thickness of 50 μm. A mixed resin (weight ratio of hydroxyl group-containing acrylate to thermosetting resin: 3% by weight) mixed with 3 parts by weight of pentaerythritol triacrylate (Daicel Cytec Co., Ltd. PETRA) as a hydroxyl group-containing acrylate is coated by a gravure coating method. Then, it was heated at 190 ° C. to cure the thermosetting resin, and a release layer having a thickness of 1 μm was laminated. (Equivalent to (Step 1) of the method for producing a hard coat transfer film of the present invention)
(Step B) After the acrylic UV curable resin is coated on the release layer by the reverse coating method, the entire surface of the acrylic UV curable resin is irradiated with 30 mJ / cm ² of UV from the hard coat layer side. The acrylic ultraviolet curable resin was cured (semi-cured) and a hard coat layer having a thickness of 5 μm was laminated. (Equivalent to (Step 2) of the method for producing a hard coat transfer film of the present invention)
(Step C) An acrylic resin (acrylic polyol resin) was coated on the hard coat layer by a micro gravure coat (reverse gravure coat) method, and an adhesive layer having a thickness of 2 μm was laminated.

[Examples 2 to 4]
The mixed resin used in (Step A) of Example 1 was mixed with 100 parts by weight of a thermosetting resin obtained by mixing an epoxy resin and a melamine resin and 5, 7, 10 parts by weight of pentaerythritol triacrylate. The hard of the present invention of Examples 2 to 4 was the same as Example 1 except that it was mixed resin (weight ratio of hydroxyl group-containing acrylate to thermosetting resin: 5 wt%, 7 wt% and 10 wt%, respectively) Each coat transfer film was obtained.

Comparative example

[Comparative Example 1]
A hard coat transfer film was obtained in the same manner as in Example 1 except that the pentaerythritol triacrylate used in (Step A) of Example 1 was not blended.

[Comparative Example 2]
The mixed resin used in (Step A) of Example 1 was prepared by mixing 100 parts by weight of an epoxymelamine-based thermosetting resin and 15 parts by weight of pentaerythritol triacrylate (of the hydroxyl group-containing acrylate with respect to the thermosetting resin). A hard coat transfer film was obtained in the same manner as in Example 1 except that the weight ratio was 15% by weight.

[Comparative Example 3]
100 weight of thermosetting resin (TM-REX DF-1 manufactured by Dainichi Seika Kogyo Co., Ltd.) in which acrylic resin and melamine resin were mixed on one side of a polyethylene terephthalate film having a thickness of 50 μm in (Step A) of Example 1 A hard coat transfer film was obtained in the same manner as in Example 1 except that the part was coated by a gravure coating method and then heated at 190 ° C. to laminate a release layer having a thickness of 1 μm.

[Peel strength measurement]
(Test method)
Using the hard coat transfer film of the present invention obtained in Examples 1 to 4 and the hard coat transfer film obtained in Comparative Examples 1 to 3 as test samples, the adhesive layer of each test sample and cellophane tape (Nitto Denko Corporation) Made in contact with a pressure-sensitive adhesive layer having a width of 18 mm), and then adhered to each other, and then peeled off between the release layer and the hard coat layer of each test sample in accordance with JIS K6854-2. The peel strength between the mold layer and the hard coat layer was measured.

(Test results)
Table 1 shows.

[Production of laminated products]
Using the hard coat transfer film of the present invention obtained in Examples 1 to 4 and the hard coat transfer film obtained in Comparative Examples 1 to 3, polycarbonate / ABS resin (polycarbonate resin and ABS resin are mixed as molding resin) Obtained by manufacturing a laminated product in which an adhesive layer and a hard coat layer are sequentially laminated on a polycarbonate / ABS resin by a simultaneous molding process (in-mold molding method). Each laminated product was irradiated with ultraviolet rays to completely cure the ultraviolet curable resin of the laminated hard coat layer.
[Appearance check]
Foil spillage of the laminated product using the hard coat transfer film of the present invention obtained in Examples 1 to 4 and the hard coat transfer film obtained in Comparative Examples 1 to 3, presence or absence of foil chipping, and The appearance was confirmed visually.

(Test results)
Table 1 shows.

As shown in Table 1, in each of the hard coat transfer films of the present invention of Examples 1 to 4, the peel strength between the release layer and the hard coat layer is 0.05 to 0.5 N / 18 mm, which is the optimum peel strength. In contrast, in the hard coat transfer films of Comparative Examples 1 and 3, the peel strength between the release layer and the hard coat layer was not within the optimum peel strength range. Further, in the hard coat transfer film of Comparative Example 2, the hard coat layer and the adhesive layer did not peel from the release layer, only the cellophane tape peeled, and the peel strength between the release layer and the hard coat layer was not measurable. It was.
In the hard coat transfer films of the present invention of Examples 1 to 4, the peel strength between the release layer and the hard coat layer is determined by the weight of the hydroxyl group-containing acrylate (pentaerythritol triacrylate) with respect to the thermosetting resin of the release layer. By changing the ratio, it was possible to adjust the peel strength within the optimum peel strength range (0.05 to 0.5 N / 18 mm).

In addition, the laminates obtained by using the hard coat transfer films of the present invention of Examples 1 to 4 were all polycarbonate / ABS resin (without appearance failure and transfer failure without foil spilling or foil cracking) ( (Transfer) The hard coat transfer film of Comparative Examples 1 and 3 was used, while the adhesive layer and hard coat layer were clearly transferred and laminated on the surface, and the appearance was good. The laminated product obtained in this way had a hard coat layer spilled out and caused an appearance defect, and the laminated product obtained by using the hard coat transfer film of Comparative Example 2 had a foil breakage and a transfer defect. .

Claims (3)

A hard coat transfer film in which at least a release layer and a hard coat layer made of an ultraviolet curable resin are sequentially laminated on a plastic film, and satisfy all the following conditions (A) to (C): Hard coat transfer film characterized by
(A) The release layer and the hard coat layer are laminated so that they are in contact with each other. (B) The release layer is any of a polyester resin, an acrylic resin, a urethane resin, a melamine resin, and an epoxy resin. Or a layer composed of one or two or more thermosetting resins and pentaerythritol triacrylate .
(C) The weight ratio of pentaerythritol triacrylate to the thermosetting resin is 3 to 10% by weight. The hard coat transfer film according to claim 1, wherein the peel strength between the release layer and the hard coat layer is 0.05 to 0.5 N / 18 mm. On a plastic film, at least one of a polyester resin, an acrylic resin, a urethane resin, a melamine resin, and an epoxy resin, or two or more thermosetting resins and pentaerythritol triacrylate comprising the releasing layer, and a hard coat layer is a sequentially stacked method of manufacturing a hard coat transfer film made of an ultraviolet curable resin, the following (step 1), and wherein the sequentially performed (step 2) A method for producing a hard coat transfer film.
(Process 1) Thermosetting resin and pentaerythritol triacrylate comprising one or more of polyester resin, acrylic resin, urethane resin, melamine resin, and epoxy resin on plastic film And coating the mixed resin in which the weight ratio of pentaerythritol triacrylate to the thermosetting resin is 3 to 10% by weight, and then heating the mixed resin to cure at least the thermosetting resin and releasing the mold. Step of laminating layers (Step 2) Coating the UV curable resin on the release layer, irradiating at least a portion coated with the UV curable resin, and curing the UV curable resin Laminating the hard coat layer