JP2019155655A - Transfer sheet and method of manufacturing decorative panel - Google Patents

Abstract

To provide a transfer sheet that allows a release film and a releasable support body to be properly peeled when transferring to a substrate to be transferred.SOLUTION: In a transfer sheet 1, at least a releasable support body 10 that has uniaxial oriented film on its releasable face side, a decorative layer 30, an adhesive layer 40, and release film 50 are laminated in this order.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a transfer sheet and a method for producing a decorative board using the transfer sheet.

  Conventionally, as building materials used for building wall materials, flooring materials, partitions, etc., a transferred substrate such as stone, wood, concrete, metal, etc., which is a transferred object, from a transfer sheet on which various designs are printed. A decorative material transferred (pasted) to the material is used. For example, a decorative sheet having the same design as natural wood can be obtained by transferring a transfer sheet printed with the same wood grain design as that of natural wood to a substrate to be transferred.

  In the transfer sheet, for example, a releasable support, a release layer, a decoration layer, an adhesive layer, and a release film are laminated in this order. As for this transfer sheet, when the release film is peeled off, the exposed pressure-sensitive adhesive layer side is bonded onto the transfer substrate. Thereafter, by releasing the releasable support, a transfer layer composed of a release layer, a decoration layer, and an adhesive layer is laminated on a transfer substrate which is a transfer target, thereby completing transfer ( For example, see Patent Document 1).

JP-A-10-151898

  In the above transfer sheet, when the peel strength between the releasable support and the release layer is smaller than the peel strength between the release film and the pressure-sensitive adhesive layer, the release film is released when the release film is peeled from the transfer sheet. There is a risk that the moldable support may peel off from the release layer. In order to solve this, when the peel strength between the releasable support and the release layer is larger than the peel strength between the release film and the pressure-sensitive adhesive layer, the transfer sheet is laminated on the transfer substrate. Thereafter, when the releasable support is peeled off from the transfer sheet, there is a possibility that the transfer layer composed of the release layer, the decoration layer, and the pressure-sensitive adhesive layer moves toward the releasable support, resulting in defective peeling.

  The objective of this invention is providing the manufacturing method of the transfer sheet and decorative board which can peel a peeling film and a releasable support body appropriately, when transferring a transfer sheet to a to-be-transferred base material.

  The present invention solves the problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this. In addition, the configuration described with reference numerals may be improved as appropriate, or at least a part thereof may be replaced with another configuration.

  1st invention is a mold release support body (10) by which the uniaxially stretched film is arrange | positioned at the mold release surface side, a decoration layer (30), an adhesive layer (40), a peeling film (50), Are related to the transfer sheet (1) laminated at least in this order.

2nd invention is the transfer sheet of 1st invention, It is the peeling strength of the said mold release support body in the said mold release surface, Comprising: 1st peeling strength along the extending direction of the said uniaxially stretched film, The peel strength of the releasable support on the release surface, the second peel strength along the direction orthogonal to the stretching direction of the uniaxially stretched film, and the peel when peeling the release film from the transfer sheet The relationship between the strength and the third peel strength along the direction orthogonal to the stretching direction of the uniaxially stretched film satisfies the following formula 1 or formula 2.
1st peel strength <3rd peel strength <2nd peel strength ... Formula 1
3rd peel strength <1st peel strength <2nd peel strength ... Formula 2

  According to a third invention, in the transfer sheet of the first or second invention, the uniaxially stretched film is a uniaxially stretched polypropylene film.

  4th invention is 1st display part (D2) which displays the direction orthogonal to the extending | stretching direction of the said uniaxially stretched film as the peeling direction of the said peeling film in the transfer sheet of any invention from 1st to 3rd. And a second display part (D1) for displaying the stretching direction of the uniaxially stretched film as the peeling direction of the releasable support.

  5th invention is a manufacturing method of the decorative board using the transfer sheet of any one of 1st to 4th invention, Comprising: The said peeling film is orthogonally crossed with the extending | stretching direction of the said uniaxially stretched film from the said transfer sheet. A first peeling step for obtaining a post-peeling transfer sheet by peeling along the second peeling direction (D2), and the post-peeling transfer sheet in the direction in which the pressure-sensitive adhesive layer and the transfer target face each other. A lamination step of obtaining a laminate by laminating on a body, and a second peeling step of peeling the releasable support from the laminate along a first peeling direction (D1) that is a stretching direction of the uniaxially stretched film. And a manufacturing method of a decorative board including the same.

  ADVANTAGE OF THE INVENTION According to this invention, when transferring a transfer sheet to a to-be-transferred base material, the manufacturing method of the transfer sheet and decorative board which can peel a peeling film and a mold release support body appropriately can be provided.

It is sectional drawing of the transfer sheet 1 of embodiment. 2 is an exploded perspective view of a transfer sheet 1. FIG. It is a figure which shows the manufacturing method of the decorative material. It is a figure which shows the manufacturing method of the decorative material.

Embodiments of the present invention will be described below with reference to the drawings. In addition, each figure shown below including FIG. 1 is the figure shown typically, and the magnitude | size and shape of each part are exaggerated suitably for easy understanding.
Numerical values such as dimensions and material names of each member described in the present specification are examples of the embodiment, and are not limited thereto, and may be appropriately selected and used.

(Configuration of transfer sheet 1)
FIG. 1 is a cross-sectional view of the transfer sheet 1 of the present embodiment. The transfer sheet 1 can be stored or conveyed in the form shown in FIG. FIG. 2 is an exploded perspective view of the transfer sheet 1. FIG. 2 schematically shows a state where the release film 50 is separated from the transfer sheet 1.
In FIG. 2 and FIGS. 3A and 4C described later, coordinate systems of X, Y, and Z orthogonal to each other are described. In this coordinate system, one direction when the transfer sheet 1 is viewed in the arrangement of FIG. 2 is an X direction, and the other direction orthogonal to the X direction is a Y direction. In the transfer sheet 1, the thickness direction orthogonal to the XY plane is defined as the Z direction.

As shown in FIG. 1, the transfer sheet 1 includes a releasable support 10, a release layer 20, a decoration layer 30, an adhesive layer 40, and a release film 50.
The transfer sheet 1 in the present embodiment adopts a flexible and thin film form as a releasable support having releasability with respect to the transfer layer of the release layer 20 or lower. On this releasable support 10, a release layer 20, a transfer layer composed of a decoration layer 30 and an adhesive layer 40, and a release film 50 having releasability with respect to the adhesive layer 40 are laminated in this order. Yes. The “lamination in this order” in the present invention means not only direct lamination but also indirect lamination. For example, another layer is provided between the releasable support 10 and the release layer 20. It is an acceptable meaning.

<Releasable support 10>
The releasable support 10 is a film that supports the decorative layer 30. The releasable support 10 has releasability with respect to the transfer layer composed of the release layer 20 and the like. Is peeled off.
The releasable support 10 of this embodiment is formed of a uniaxially stretched film. A uniaxially stretched film is a film material obtained by stretching a base film in one direction and aligning molecules in one direction.

  The uniaxially stretched film and the transfer layer have a property that the molecules are easily peeled in the direction in which the molecules are uniaxially stretched (MD direction), and are difficult to peel in the direction orthogonal to the direction of uniaxially stretched (TD direction). As will be described later, when the release film 50 is peeled from the transfer sheet 1, the release film 50 is peeled in a direction orthogonal to a direction uniaxially stretched (hereinafter also referred to as “uniaxial stretch direction”).

The uniaxially stretched film satisfies, for example, MD tensile strength> TD tensile strength in the tensile strength (JIS K7127) in the MD direction and the TD direction. For example, although it is different from a uniaxially stretched film, the ratio of tensile strength in a biaxially stretched polypropylene (OPP) film having anisotropy in peel strength is MD direction: TD direction = about 2: 1. On the other hand, the ratio of the tensile strength in the biaxially stretched PET film is MD direction: TD direction = 10: 9, and no anisotropy is confirmed. For this reason, it is desirable that the MD tensile strength in the uniaxially stretched film is 30% or more larger than the TD tensile strength.
Further, the ratio between the first peel strength and the second peel strength, which will be described later, is, for example, first peel strength: second peel strength = 1: 10 or more, and the present invention is such that the difference in peel strength depending on the peel direction becomes large. The effect of this will be achieved.

  In the present embodiment, the first peel strength is the peel strength on the release surface of the releasable support 10 and refers to the peel strength along the uniaxial stretching direction (MD direction). The second peel strength refers to peel strength along a direction (TD direction) orthogonal to the uniaxial stretching direction.

  Examples of the uniaxially stretched film that can be used as the releasable support 10 include uniaxially stretched polypropylene and uniaxially stretched polyethylene. In addition, the conventionally well-known release layer may be formed in the surface at the side of the peeling layer 20 in the mold release support body 10, and the mold release process may be performed. Moreover, the releasable support body 10 should just have arrange | positioned the uniaxially stretched film at least on the mold release surface side, and the other layer may be laminated | stacked on the opposite side to a mold release surface. As the releasable support 10, examples of the layer that can be laminated together with the uniaxially stretched film include an antistatic layer and an antiblocking layer.

  As shown in FIG. 2, the releasable support 10 has a peel mark D <b> 1 (second display portion) indicating a peel direction on a surface opposite to the peel layer 20 (surface in the Z direction). . The peeling mark D1 indicates the direction (first peeling direction) in which the release support 10 is peeled after the transfer sheet 1 is laminated on the transfer substrate 60 (described later). The release mark D1 is formed on the surface of the releasable support 10 opposite to the release layer 20 by, for example, printing. The operator, after laminating the transfer sheet 1 on the transfer substrate 60, peels the releasable support 10 in the direction indicated by the release mark D <b> 1, so that the transfer sheet 1 is transferred between the transfer sheet 1 and the transfer substrate 60. The releasable support 10 can be peeled without causing defective peeling.

  In the releasable support 10, the direction of the release mark D <b> 1 coincides with the uniaxially stretched direction (MD direction) of the uniaxially stretched polypropylene forming the releasable support 10. The MD direction corresponds to a longitudinal direction (longitudinal direction) when stretched while transporting a continuous belt-shaped uniaxially stretched polypropylene. In FIG. 2, the peeling mark D1 is indicated by an arrow in one direction, but the direction opposite to the arrow may be the peeling direction as long as the direction is the same.

As described above, the uniaxially stretched film forming the releasable support 10 has a property of easily peeling in the direction in which molecules are uniaxially stretched. Therefore, after the transfer sheet 1 is laminated on the transfer substrate 60, the transfer sheet 1 and the transfer substrate 60 are separated by peeling the uniaxially stretched polypropylene along the direction of the release mark D1 that matches the uniaxial stretch direction. The releasable support 10 can be peeled without causing bad peeling between the two. The relationship between the peel strength of the releasable support 10 and the release film 50 will be described later.
The film thickness of the releasable support 10 is preferably 10 μm or more and 200 μm, more preferably 20 μm or more and 60 μm or less.

<Peeling layer 20>
The release layer 20 is a layer that is laminated to facilitate the release of the releasable support 10 from the transfer sheet 1. The release layer 20 remains as the outermost layer of the transfer sheet 1 after the transfer sheet 1 is laminated on the substrate 60 to be transferred, the releasable support 10 is released, and the transfer process is completed. A topcoat layer 70 (described later) is formed on the surface of the release layer 20. As the release layer 20, for example, an acrylic resin, a vinyl chloride-vinyl acetate copolymer resin, or the like can be used.

<Decoration layer 30>
The decoration layer 30 is a layer on which the design (design) of the transfer sheet 1 is formed. Examples of the resin constituting the decorative layer 30 include acrylic resin, vinyl chloride-vinyl acetate copolymer resin, acrylic- (vinyl chloride-vinyl acetate copolymer) resin, and the like. In addition, a coloring pigment, a coloring dye, and the like are added to the decoration layer 30. The layer thickness (dry) of the decorative layer 30 is about 5 μm.

  Although not shown, a print coat layer may be laminated on the pressure-sensitive adhesive layer 40 side of the decorative layer 30. The print coat layer functions as a concealing layer for making it difficult to see the surface (base) of the transferred substrate 60 when the transfer sheet 1 is transferred to the transferred substrate 60. The print coat layer is formed so as to cover the entire surface of the decoration layer 30 and is colored, for example, white, gray, brown, or the like.

  Although not shown, a clear resin layer may be laminated between the decorative layer 30 and the pressure-sensitive adhesive layer 40. The clear resin layer functions as a crack suppression layer that suppresses the occurrence of cracks in the decorative layer 30. Examples of the resin constituting the clear resin layer include acrylic- (vinyl chloride-vinyl acetate copolymer) resin, vinyl chloride-vinyl acetate copolymer resin, and the like.

  The material that can be used as the clear resin layer preferably has a glass transition temperature (Tg) of normal temperature or higher. Moreover, it is preferable that the glass transition temperature of a clear resin layer is lower than the glass transition temperature of the decoration layer 30, is higher than the glass transition temperature of a joining layer, and exists in the middle of both. When the deformation changes in the viscoelasticity of each layer, it is easy to absorb the stress due to the deformation if this relationship exists. If the glass transition temperature of the clear resin layer is lower than room temperature, the clear resin layer itself is deformed due to a change in temperature, and the deformation acts as a stress on the decorative layer 30 and may cause a crack in the decorative layer 30. Because there is. The layer thickness (dry) of the clear resin layer is preferably 1 μm or more.

<Adhesive layer 40>
The adhesive layer 40 is a layer that bonds the transfer sheet 1 and the transfer target substrate 60 together when the transfer sheet 1 is transferred to the transfer target substrate 60. The pressure-sensitive adhesive layer 40 of the present embodiment is made of a cured product of the pressure-sensitive adhesive composition. The pressure-sensitive adhesive composition contains an acrylic pressure-sensitive adhesive as a main agent and an isocyanate-based curing agent. Examples of other types of pressure-sensitive adhesive forming the pressure-sensitive adhesive layer 40 include rubber-based and silicon-based adhesives.
The thickness of the pressure-sensitive adhesive layer 40 is preferably 10 μm or more and 50 μm or less, and more preferably 15 μm or more and 30 μm or less.

[Acrylic adhesive]
A preferable acrylic pressure-sensitive adhesive includes, for example, an acrylate copolymer obtained by copolymerizing an acrylate ester with another monomer. Examples of the acrylate ester include ethyl acrylate, acrylate-n-butyl, acrylate-2-ethylhexyl, isooctyl acrylate, isononyl acrylate, hydroxylethyl acrylate, propylene glycol acrylate, acrylamide, glycidyl acrylate, and the like. Is mentioned. These can be used alone or in combination of two or more.

Other monomers include, for example, methyl acrylate, methyl methacrylate, styrene, acrylonitrile, vinyl acetate, acrylic acid, methacrylic acid, itaconic acid, hydroxylethyl acrylate, hydroxylethyl methacrylate, propylene glycol acrylate, acrylamide Methacrylamide, glycidyl acrylate, glycidyl methacrylate, dimethylaminoethyl methacrylate, tert-butylaminoethyl methacrylate, and n-ethylhexyl methacrylate. These can be used alone or in combination of two or more.
In addition, as a commercial item of the said acrylic adhesive, Nisset (Nippon Carbite Industries Co., Ltd. product), SK Dyne (manufactured by Soken Chemical Co., Ltd.), etc. can be used suitably, for example.

[Isocyanate curing agent]
The pressure-sensitive adhesive composition contains an isocyanate curing agent. The isocyanate-based curing agent is added in order to obtain adhesiveness when the transfer sheet 1 is laminated and transferred to the transfer substrate 60. Since the acrylic pressure-sensitive adhesive has a hydroxyl group, by using an isocyanate-based curing agent, partial crosslinking can be further improved. When the pressure-sensitive adhesive layer 40 is formed, there is no internal destruction and an appropriate storage elastic modulus is obtained. can get.

  Examples of the isocyanate curing agent include a polyisocyanate compound, a trimer of a polyisocyanate compound, a urethane prepolymer having a terminal isocyanate group obtained by reacting a polyisocyanate compound and a polyol compound, and 3 of this urethane prepolymer. Examples include a polymer.

  Examples of the polyisocyanate compound include 2,4-tolylene diisocyanate, 2,5-tolylene diisocyanate, 1,3-xylylene diisocyanate, 1,4-xylylene diisocyanate, diphenylmethane-4,4′-diisocyanate, 3 -Methyldiphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane-4,4'-diisocyanate, dicyclohexylmethane-2,4'-diisocyanate, lysine isocyanate and the like.

<Peeling film 50>
The release film 50 is a film that is peeled from the transfer sheet 1 when the transfer sheet 1 is transferred to the transfer substrate 60. Examples of the material constituting the release film 50 include polyethylene terephthalate (PET), n-polypropylene (PP) and the like that have been subjected to a release treatment with silicon, fluorine resin, alkyd resin, or the like.
The thickness of the release film 50 is preferably 10 μm or more and 100 μm or less, and more preferably 20 μm or more and 60 μm or less.

  As shown in FIG. 2, the release film 50 has a release mark D <b> 2 (first display portion) indicating the release direction on the surface opposite to the pressure-sensitive adhesive layer 40 (back surface in the Z direction). The peeling mark D2 indicates the direction in which the peeling film 50 is peeled from the transfer sheet 1 (second peeling direction). The release mark D2 is formed on the surface of the release film 50 opposite to the adhesive layer 40, for example, by printing. The operator peels the release film 50 from the transfer sheet 1 along the direction indicated by the release mark D2, so that the transfer can be performed without causing defective peeling between the release support 10 and the release layer 20. The release film 50 can be peeled from the sheet 1.

  In the release film 50, the direction of the release mark D <b> 2 matches the lateral direction (TD direction) orthogonal to the uniaxially stretched direction (MD direction) of the uniaxially stretched polypropylene that forms the releasable support 10.

The peel strength at the release surface of the releasable support 10 described above, the first peel strength along the stretching direction of the uniaxially stretched polypropylene film, and the first along the direction orthogonal to the stretch direction of the uniaxially stretched polypropylene film. 2 peel strength and peel strength when peeling the release film 50 from the transfer sheet 1, and a third peel strength along a direction perpendicular to the stretching direction of the releasable support 10 (uniaxially stretched polypropylene film) The relationship may satisfy the following Equation 1 or Equation 2.
1st peel strength <3rd peel strength <2nd peel strength ... Formula 1
3rd peel strength <1st peel strength <2nd peel strength ... Formula 2

  In the transfer sheet 1, in order to be able to peel the release film 50 without causing defective release between the releasable support 10 and the release layer 20, at least the third peel strength of the release film 50 is sufficient. It is only necessary that a relationship that is relatively smaller than the second peel strength of the releasable support 10 is satisfied. On the other hand, after the transfer sheet 1 is laminated on the transfer base 60, the peel strength between the pressure-sensitive adhesive layer 40 and the transfer base 60 is relatively higher than the first peel strength of the releasable support 10. Therefore, the relationship between the first peel strength and the third peel strength may be the first peel strength <the third peel strength as in the above formula 1, or the third peel strength <the first as in the above formula 2. Peel strength may be used.

(Method for manufacturing cosmetic material 100)
Next, a method for manufacturing the decorative material 100 using the transfer sheet 1 described above will be described.
3 and 4 are diagrams showing a method of manufacturing the decorative material 100, respectively.
First, as shown to FIG. 3 (A), the peeling film 50 is peeled from the transfer sheet 1 along the direction which the peeling mark D2 (2nd peeling direction) points. In FIG. 3A, for ease of explanation, a release mark D2 printed on the release film 50 is shown on the front side. Actually, the operator peels off the release film 50 from the transfer sheet 1 after confirming the release mark D2 printed on the surface opposite to the adhesive layer 40 (back surface in the Z direction) of the release film 50. Peel along the direction indicated by the mark D2.

As described above, in the transfer sheet 1, the third peel strength when the peelable film 50 is peeled along the peel mark D2 direction orthogonal to the uniaxial stretching direction of the releasable support 10 is the releasable support. It is set to be smaller than the second peel strength when the body 10 is peeled along the direction orthogonal to the uniaxial stretching direction. Therefore, in the transfer sheet 1 of the present embodiment, when the release film 50 is peeled off, the transfer layer (laminate) composed of the release layer 20, the decorative layer 30, and the adhesive layer 40 moves to the release film 50 side. Defective peeling can be suppressed.
By peeling the release film 50 from the transfer sheet 1, the surface (adhesive surface) opposite to the decorative layer 30 in the pressure-sensitive adhesive layer 40 is exposed.

  Next, as shown in FIG. 3B, the transfer sheet 1 (peeled transfer sheet) from which the release film 50 has been peeled is laminated on the substrate to be transferred 60. The transfer of the transfer sheet 1 to the transfer target substrate 60 can be continuously performed in the form of a roll-to-roll, a roll-to-sheet, or the like. Here, the “roll-to-roll” means that the belt-shaped transfer sheet 1 is pulled out from the roll and supplied to a flat plate-shaped transfer target body (transfer target substrate body 61 described later), and the transfer layer is placed on the transfer target. This is a processing mode in which the belt-like release support (release support 10) after releasing the transfer layer is again wound on a roll.

  In addition, the “roll-to-sheet” means that the transfer sheet 1 is roughly transferred before and after the belt-shaped transfer sheet 1 is pulled out of the roll and supplied to the flat plate-like transfer object, and the transfer layer is transferred onto the transfer object. This refers to a processing mode in which a sheet is cut (cut) into the size of one transfer target, and the sheet release support after the transfer layer is released is removed (discarded) one by one. Alternatively, the transfer sheet 1 may be manually transferred to the transfer target substrate 60 and then pressed with a spatula or the like so as to be in close contact with the surface of the transfer target substrate 60. The transfer sheet 1 of the present embodiment can be transferred to the transfer substrate 60 at room temperature.

The transferred substrate 60 includes a transferred substrate main body 61 and a sealer layer 62.
The transfer base body 61 is a transfer body onto which the transfer sheet 1 is transferred. Examples of the substrate body 61 to be transferred include plates and walls made of materials such as inorganic materials, wood, resin, and cloth silk. Among these, examples of the inorganic material include stone, concrete, glass, and metal.

The sealer layer 62 is an undercoat layer for smoothening the surface of the transferred substrate main body 61 and improving the adhesion between the transferred substrate main body 61 and the transfer sheet 1. The sealer layer 62 is omitted when the smoothness of the surface (transfer surface) of the transfer base body 61 is sufficient.
In addition, as a shape of the to-be-transferred base material 60, the thing of a suitable shape is selected according to a use, such as a board, a sheet | seat, a film, various solid shapes (a cylinder, a polygonal column, etc.), for example. As a general shape of the substrate 60 to be transferred, a flat plate is widely used.

  Next, as shown in FIG. 4C, the releasable support 10 is peeled from the transfer sheet 1 laminated on the transfer substrate 60 along the direction indicated by the peeling mark D1 (first peeling direction). To do. After the transfer sheet 1 is laminated on the substrate to be transferred 60, the peel strength between the transfer sheet 1 and the substrate to be transferred 60 is the first peel strength when the releasable support 10 is peeled in the uniaxial stretching direction. Will be relatively larger. Therefore, in the transfer sheet 1 laminated on the substrate 60 to be transferred, when the releasable support 10 is peeled along the direction of the peeling mark D1, the peeling layer 20, the decorative layer 30, and the adhesive layer 40 are separated. It is possible to suppress defective peeling that causes the transfer layer to be transferred to the releasable support 10 side. By releasing the releasable support 10 from the transfer sheet 1, the transfer of the transfer sheet 1 to the transfer substrate 60 is completed. Moreover, by peeling the releasable support 10 from the transfer sheet 1, the surface of the release layer 20 opposite to the decorative layer 30 is exposed.

Next, as shown in FIG. 4D, a top coat layer 70 is formed on the exposed surface of the release layer 20. The top coat layer 70 is a layer for imparting durability such as scratch resistance, color, gloss, and the like to the surface of the decorative material 100 as a finishing agent. Further, by forming the top coat layer 70, the decorative material 100 can be provided with weather resistance and stain resistance. Examples of the top coat layer 70 include an acrylic resin, a silicon-based resin, a fluororesin, and a urethane resin.
The thickness of the top coat layer 70 is not particularly limited, but is preferably 5 μm or more and 1000 μm or less, more preferably 10 μm or more and 300 μm or less.

  By passing through the above process, the decorative material 100 by which the transfer sheet 1 was transcribe | transferred to the to-be-transferred base material 60 can be obtained. As described above, in the transfer sheet 1 of the present embodiment, the release support 10 and the release film 50 can be appropriately peeled without causing defective peeling when transferring to the transfer target substrate 60. .

Next, an Example and a comparative example are shown and this invention is further demonstrated. However, the present invention is not limited to the following examples.
Example 1
A 25 μm thick corona-treated uniaxially stretched polypropylene film (“Noblen” Toyo Ink Co., Ltd.) was prepared as the releasable support 10. Next, an acrylic resin composition (“Haklinis 46-7”, manufactured by Showa Ink Industries, Ltd.) is prepared, applied to one surface of the releasable support 10, and a release layer 20 having a film thickness (dry) of 1 μm. Formed. On the release layer 20, printing was performed a plurality of times with a gravure ink ("BC heat resistance" manufactured by Showa Ink Industries Co., Ltd.) composed of an acrylic resin composition and a color pigment, and a decorative layer 30 as shown in FIG. 1 was formed. .

  On the other hand, as the release film 50, a separator (“E7006” manufactured by Toyobo Co., Ltd.) made of a 25 μm-thick biaxially stretched PET film was prepared. An adhesive material obtained by mixing acrylic adhesive material (“Nissetsu KP1384L” manufactured by Nippon Carbide Industries Co., Ltd.) and 2.3 parts of curing agent (“CK101” manufactured by Nippon Carbide Industries Co., Ltd.) on the release film 50 The film was coated so as to have a film thickness (dry) of 20 μm and dried to form an adhesive layer 40 as shown in FIG.

  And after bonding together the decorative layer 30 by the side of the release property support body 10, and the adhesive layer 40 by the side of the peeling film 50 (PET separator), it heat-cures at 40 degreeC for 3 days, and an Example 1 transfer sheet was obtained. In the transfer sheet of Example 1, the peel strength between the releasable support 10 and the release layer 20 has a first peel strength of 56 (mN / 25 mm) in the uniaxial stretching direction (MD direction), and the uniaxial stretching direction. The second peel strength in the lateral direction (TD direction) orthogonal to the value was 5000 (mN / 25 mm) or more.

The peel strength of 5000 (mN / 25 mm) or more is a level at which the peel strength between the releasable support 10 and the release layer 20 cannot be measured. These peel strengths were measured using a testing machine based on the test method of JIS Z0237 (the same applies to Example 2 described later).
The layer configurations of Example 2 and Comparative Examples 1 and 2 shown below are the same as those of Example 1 described above.

(Example 2)
The same material and conditions as in Example 1 were used except that a vinyl chloride-vinyl acetate copolymer resin composition (“Haklinis UVC-5” manufactured by Showa Ink Industries, Ltd.) was used as the resin constituting the release layer 20. The transfer sheet of Example 2 was obtained. In the transfer sheet of Example 2, the peel strength between the releasable support 10 and the release layer 20 is 89 (mN / 25 mm) in the uniaxial stretching direction (MD direction), and the uniaxial stretching direction. The second peel strength in the lateral direction (TD direction) orthogonal to the value was 5000 (mN / 25 mm) or more.

(Comparative Example 1)
A transfer sheet of Comparative Example 1 was obtained using the same materials and conditions as in Example 1 except that a biaxially stretched polypropylene film (“FOS” manufactured by Phutamura Chemical Co., Ltd.) was used as the resin constituting the releasable support 10. It was. In the transfer sheet of Comparative Example 1, the peel strength between the releasable support 10 and the release layer 20 is that the first peel strength in the uniaxial stretching direction (MD direction) is 2500 (mN / 25 mm), and the uniaxial stretching direction. The second peel strength in the transverse direction (TD direction) perpendicular to the cross section was 70 (mN / 25 mm) or more.
(Comparative Example 2)
As the resin constituting the releasable support 10, an unstretched polypropylene film ("FPK")
A transfer sheet of Comparative Example 2 was obtained using the same materials and conditions as in Example 1 except that Futamura Chemical Co., Ltd. was used. In the transfer sheet of Comparative Example 2, the peel strength between the releasable support 10 and the release layer 20 is the first peel strength in the uniaxial stretching direction (MD direction) and the transverse direction (TD direction) perpendicular to the uniaxial stretching direction. ) Second peel strength was 5000 (mN / 25 mm) or more.

  The transfer sheets of Examples 1 and 2 and Comparative Examples 1 and 2 were each transferred to a 1 mm thick aluminum plate (transfer target substrate 60) to obtain a decorative material as a sample. Each decorative material was evaluated for defective peeling before transfer and transferability during transfer.

  Defective peeling is a test item for verifying whether or not the transfer layer has moved to the peeling film 50 side when the peeling film 50 (PET separator) is peeled from the transfer sheet in the TD direction. When the release film 50 is peeled from the transfer sheet, the case where the transfer layer has completely moved to the release film 50 side is “x”, and the case where a part of the transfer layer has moved to the release film 50 side is indicated by “Δ”. . Further, when the release film 50 was peeled from the transfer sheet, the case where the transfer layer did not move to the release film 50 side was marked as “◯”.

The transferability is a test item for verifying whether or not the transferable sheet 10 can be cleanly peeled when the releaseable support 10 is peeled off from the transfer sheet in the MD direction after the transfer sheet is attached to the aluminum plate. When the releasable support 10 is peeled from the transfer sheet, the case where the releasable support 10 cannot be peeled or the transfer layer remains in a part of the releasable support 10 is indicated as “x”, and the releasable support A case where the transfer layer could be peeled off almost without remaining on the body 10 was marked with “◯”.
Table 1 shows the results of the above test items for the transfer sheets of Examples 1 and 2 and Comparative Examples 1 and 2.

(Evaluation results)
It has been confirmed that the transfer sheets of Examples 1 and 2 can suppress defective peeling that causes the transfer layer to move toward the release film 50 when the release film 50 is peeled from the transfer sheet. Moreover, it was confirmed that the decorative material having the transfer sheets of Examples 1 and 2 was able to peel the releasable support 10 from the transfer sheet without leaving the transfer layer.

  In the transfer sheet of Comparative Example 1 (biaxial stretching), it was confirmed that defective peeling occurred when the release film 50 was peeled from the transfer sheet. This is because, in the transfer sheet of Comparative Example 1, the third peel strength between the release film 50 and the pressure-sensitive adhesive layer 40 is larger than the second peel strength between the releasable support 10 and the release layer 20. It is thought that it became. On the other hand, in terms of transferability, it was confirmed that the transfer layer remained on the releasable support 10 when the releasable support 10 was peeled from the transfer sheet. This is because, in the transfer sheet of Comparative Example 2, the first peel strength between the releasable support 10 and the release layer 20 is the peel between the aluminum plate (transfer target substrate 60) and the pressure-sensitive adhesive layer 40. This is thought to be because it was greater than the strength.

  The transfer sheet of Comparative Example 2 did not cause defective peeling because the release strength of the releasable support 10 and the release film 50 was high. However, in the transfer sheet of Comparative Example 2, it was confirmed that the releasable support 10 remained in the transfer layer when the releasable support 10 was peeled from the transfer sheet. This is because, in the transfer sheet of Comparative Example 2, the first peel strength between the releasable support 10 and the release layer 20 is the peel between the aluminum plate (transfer target substrate 60) and the pressure-sensitive adhesive layer 40. This is thought to be because it was greater than the strength.

As described above, in the transfer sheets of Examples 1 and 2, when the release film 50 is peeled from the transfer sheet 1, it is clear that defective peeling that causes the transfer layer to move to the release film 50 side can be suppressed. became. Moreover, it became clear that the decorative material having the transfer sheets of Examples 1 and 2 is excellent in transferability.
In addition, since the transfer sheets of Examples 1 and 2 can be transferred to a substrate at room temperature (non-heated), a transfer device and a heating device provided with a heating device at the time of transfer, such as a transfer sheet that requires heating for transfer, can be used. It becomes unnecessary. Therefore, the transfer sheets of Examples 1 and 2 are excellent in workability during transfer.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, Various deformation | transformation and a change are possible like the deformation | transformation form mentioned later, These are also this invention. Within the technical scope of In addition, the effects described in the embodiments are merely a list of the most preferable effects resulting from the present invention, and are not limited to those described in the embodiments. In addition, although the above-mentioned embodiment and the deformation | transformation form mentioned later can also be used in combination suitably, detailed description is abbreviate | omitted.

(Deformation)
In the embodiment, as illustrated in FIG. 2, the example in which the peeling marks D1 and D2 indicating the peeling direction are thick arrows has been described. However, the peeling marks D1 and D2 are not limited to the example of this embodiment, for example, X3 Other combinations of characters and numbers such as 5Y, only characters, only numbers, symbols, designs, patterns, and the like may be used. Further, the peeling marks D1 and D2 are not necessarily formed on the transfer sheet 1. For example, a diagram showing the peeling direction may be described in an instruction manual (attached document). As described above, the transfer sheet according to the present invention is not limited to the implementation as the transfer sheet including the first display unit and the second display unit, but the instruction sheet including the transfer sheet, the first display unit, and the second display unit. May be implemented as a set of

  The transfer sheet according to the present invention can impart excellent designability and weather resistance to the transfer target (base material). This decorative material is used for indoor or outdoor vehicles such as automobiles, railway vehicles, ships, aircraft, etc. in addition to building wall materials (exterior materials, interior materials), partitions, doors, window frames, furniture, interior decorations, etc. It can also be applied to cover materials for (exterior), various signs, panel materials for outdoor advertising, and the like.

  1: transfer sheet, 10: releasable support, 20: release layer, 30: decorative layer, 40: adhesive layer, 50: release film, 60: substrate to be transferred, 70: topcoat layer

Claims (5)

  A transfer sheet in which a releasable support in which a uniaxially stretched film is disposed on the release surface side, a decorative layer, an adhesive layer, and a release film are laminated in at least this order. The transfer sheet according to claim 1,
The peel strength of the releasable support on the release surface, the first peel strength along the stretching direction of the uniaxially stretched film,
The peel strength of the releasable support on the release surface, the second peel strength along the direction orthogonal to the stretching direction of the uniaxially stretched film,
The peel strength when peeling the release film from the transfer sheet, and the relationship with the third peel strength along the direction orthogonal to the stretching direction of the uniaxially stretched film satisfies the following formula 1 or formula 2. Transfer sheet.
1st peel strength <3rd peel strength <2nd peel strength ... Formula 1
3rd peel strength <1st peel strength <2nd peel strength ... Formula 2 In the transfer sheet according to claim 1 or 2,
The transfer sheet, wherein the uniaxially stretched film is a uniaxially stretched polypropylene film. In the transfer sheet according to any one of claims 1 to 3,
A first display unit that displays a direction orthogonal to the stretching direction of the uniaxially stretched film as the peeling direction of the release film;
A transfer sheet comprising: a second display unit that displays a stretching direction of the uniaxially stretched film as a peeling direction of the releasable support. A method for producing a decorative board using the transfer sheet according to any one of claims 1 to 4,
A first peeling step of peeling the release film from the transfer sheet along a second peeling direction perpendicular to the stretching direction of the uniaxially stretched film to obtain a transfer sheet after peeling;
A transfer step of laminating the transfer sheet after peeling on the transfer target body in a direction in which the pressure-sensitive adhesive layer and the transfer target object face each other;
A second peeling step of peeling the releasable support along the first peeling direction, which is the stretching direction of the uniaxially stretched film, from the laminate;
The manufacturing method of a decorative board containing this.

Images