JP2018165038A - Transfer sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transfer sheet that can suppress occurrence of crack in a printed layer due to ageing without reducing the productivity.SOLUTION: A transfer sheet 1 has a release type support body 10, a printed layer 30, and a bonding layer 40 laminated in this order, the bonding layer 40 containing a plasticizer.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a transfer sheet.

  Conventionally, as a building material used for building wall materials, partitions, etc., a transfer sheet on which various designs are printed is transferred (pasted) to a base material such as stone, concrete, or metal plate to be transferred. The material is used. For example, a metal decorative board having the same design as that of natural wood can be obtained by transferring a transfer sheet on which a pattern having the same grain pattern as that of natural wood is printed onto a metal board.

  In the transfer sheet as described above, a releasable support, a printing layer, and an adhesive layer are laminated in this order. In this transfer sheet, after the printed layer side is adhered to the substrate, the support is peeled off, whereby the transfer layer composed of the printed layer, the adhesive layer, and the like is transferred onto the substrate to be transferred. When the transfer sheet is transferred to the substrate, the stress caused by the fluidity of the adhesive layer acts on the printed layer without being relaxed by the substrate. Since the printing layer has a lower expansion / contraction rate than the adhesive layer, it is difficult to maintain the shape when stress is applied, and cracks may occur over time.

  In order to suppress such problems, a laminate in which a flexible resin layer (buffer layer) is laminated between the printing layer and the adhesive layer to suppress cracking, peeling, etc. of the printing layer has been proposed. (For example, refer to Patent Document 1).

JP-A-10-151898

  However, even if a flexible resin layer is laminated between the printed layer and the adhesive layer, the adhesive layer still has fluidity, so that there is a risk that the printed layer will crack over time in the long run. .

  The objective of this invention is providing the transfer sheet which can suppress generation | occurrence | production of the crack with time of a printing layer.

The present invention solves the above problems by the following means.
(1) A releasable support, a printing layer, and a bonding layer are laminated in this order, and the bonding layer is a transfer sheet containing a plasticizer.

  (2) The transfer sheet according to (1), wherein the bonding layer is a pressure-sensitive adhesive layer including a cured product of a composition containing an acrylic pressure-sensitive adhesive and an isocyanate-based curing agent, and the plastic layer The agent is a transfer sheet having a solid content of 0.1 to 10 parts by mass with respect to 100 parts by mass of the solid content of the acrylic pressure-sensitive adhesive.

  (3) The transfer sheet according to (1), wherein the bonding layer is selected from an acrylic adhesive, an epoxy adhesive, a urethane adhesive, a silicon adhesive, and an ultraviolet curable adhesive. It is an adhesive layer containing a cured product of more than one kind of adhesive, and the plasticizer is 0.1 parts by mass or more and 10 parts by mass or less in terms of solid content with respect to 100 parts by mass of the solid content of the adhesive. Transfer sheet.

  (4) The transfer sheet according to (1), wherein the bonding layer is a heat sealant layer including a vinyl acetate heat sealant or a vinyl chloroacetate sheet sealant, and the plasticizer is a heat seal. The transfer sheet which is 0.1 mass part or more and 10 mass parts or less in conversion of solid content with respect to 100 mass parts of solid content of an agent.

  (5) The transfer sheet according to any one of (1) to (4), wherein the plasticizer is an adipate ester plasticizer or a phthalate ester plasticizer.

  ADVANTAGE OF THE INVENTION According to this invention, the transfer sheet which can suppress generation | occurrence | production of the crack with time of a printing layer can be provided.

It is sectional drawing of the transfer sheet 1 of embodiment. It is sectional drawing explaining the manufacturing method of the decorative board 100. FIG. It is sectional drawing explaining the manufacturing method of the decorative board 100. FIG.

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.

<First Embodiment>
(Configuration of transfer sheet 1)
FIG. 1 is a cross-sectional view of a transfer sheet 1 according to the first embodiment. The transfer sheet 1 can be stored or conveyed in the form shown in FIG.
As shown in FIG. 1, the transfer sheet 1 includes a base film 10 as a releasable support, a release layer 20, a printing layer 30, an adhesive layer 40 as a bonding layer, and a release film 50.

  The transfer sheet 1 in the present embodiment employs a flexible and thin film form as a releasable support having releasability with respect to the transfer layer below the release layer (hereinafter referred to as a base film). Also called). On this base film 10, a transfer layer comprising a release layer 20, a printing layer 30 and an adhesive layer 40, and a release film 50 having releasability from the adhesive layer 40 are laminated in this order. The “lamination in this order” in the present invention means not only direct lamination but also indirect lamination. For example, there is another layer between the base film 10 and the release layer 20. Is also acceptable.

<Base film 10>
The base film (releasable support) 10 is a film that supports the printing layer 30. The base film 10 has releasability from the transfer layer including the release layer 20 and the like, and after the transfer sheet 1 is transferred to the base 60 (described later), the base film 10 is peeled off from the interface with the release layer 20. . Examples of the base film 10 include polyester resins such as polyethylene terephthalate, polyethylene aphthalate, and polybutylene terephthalate, polyolefin resins such as polypropylene and polyethylene, cellulose resins such as polycarbonate resin, polystyrene resin, and triacetyl cellulose (TAC). Examples thereof include a film made of a resin or the like. Among these, a biaxially stretched polyethylene terephthalate (PET) film is preferable in terms of excellent strength and flexibility. In addition, the conventionally well-known release layer may be formed in the surface at the side of the peeling layer 20 in the base film 10, and the release process may be performed.
The film thickness of the base film 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 peeling of the base film 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 transferred to the base 60 and the base film 10 is peeled off. A weather resistance imparting layer 70 (described later) is formed on the surface of the release layer 20. Examples of the resin constituting the release layer 20 include acrylic polyol, urethane resin, acrylic resin, vinyl chloride-vinyl acetate copolymer, and polyester resin. In these compositions, a small amount of isocyanate or the like may be further added for adjusting the peel strength. In addition, weathering agents such as ultraviolet absorbers (UVA) and light stabilizers (radical scavengers such as HALS (hindered amine radical scavengers)) may be added to these compositions.
The thickness (dry) of the release layer 20 is about 1 μm or more and 2 μm or less.

  In the present embodiment, the peel strength between the base film 10 and the release layer 20 (according to JIS Z0237) is at least twice the peel strength between the release film 50 and the adhesive layer 40 described later. Is set as follows. This is to prevent the base film 10 from being peeled from the release layer 20 when the release film 50 is peeled from the transfer sheet 1. However, the present invention is not limited to this, and the peeling strength may be reversed so that the peeling layer 20 remains on the base film 10 side when the peeling film 50 is peeled from the transfer sheet 1.

<Print layer 30>
The print layer 30 includes a print pattern layer 31 and a print coat layer 32.
The printed pattern layer 31 is a layer on which the design (design) of the transfer sheet 1 is formed. Examples of the resin constituting the printed pattern layer 31 include an acrylic resin, a vinyl chloride-vinyl acetate copolymer (vinyl acetate) resin, and a composition in which an acrylic resin and a vinyl acetate resin are mixed. In addition, a coloring pigment, a coloring dye, and the like are added to the printed picture layer 31.
The layer thickness (dry) of the printed picture layer 31 is about 5 μm.

The print coat layer 32 is a concealing layer for making it difficult to see the substrate 60 (base) onto which the transfer sheet 1 is transferred. The print coat layer 32 is formed so as to cover the entire surface of the print pattern layer 31 and is colored, for example, white, gray, brown, or the like. In this invention, after transferring the transfer sheet 1 to the base material 60, it becomes a problem that the print coat layer 32 is cracked over time. Examples of the resin constituting the print coat layer 32 include an acrylic resin, a vinyl chloride-vinyl acetate copolymer (vinyl acetate) resin, and an acrylic-vinyl acetate resin. The material that can be used as the print coat layer 32 preferably has a glass transition point (Tg) of room temperature or higher.
The layer thickness (dry) of the print coat layer 32 is preferably 1 μm or more.

<Adhesive layer 40>
In 1st Embodiment, the layer which consists of an adhesive, ie, the adhesion layer 40, is employ | adopted as a joining layer.
The adhesive layer (adhesive layer) 40 is a layer that joins the transfer sheet 1 and the substrate 60 when the transfer sheet 1 is transferred to the substrate 60. The pressure-sensitive adhesive layer 40 of this embodiment is made of a cured product of a 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, and further contains a plasticizer (described later).
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. In the present invention, among the acrylate esters, acrylate-n-butyl and acrylate-2-ethylhexyl are preferable in terms of excellent heat resistance, moist heat resistance, durability, and transparency.

  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 the present invention, among the other monomers, (meth) acrylic acid-n-butyl is preferable.

  The weight average molecular weight (Mw) of the acrylate copolymer used as the acrylic pressure-sensitive adhesive is preferably in the range of 800,000 to 2,000,000, more preferably 1,000,000 to 1,500,000. When the weight average molecular weight is less than 800,000, the pressure-sensitive adhesive layer 40 becomes soft and sufficiently follows the deformation of the printing layer 30, but cannot withstand internal stress repeated under high-temperature and high-humidity long-term conditions. Internal destruction will occur. On the other hand, when the weight average molecular weight exceeds 2 million, the pressure-sensitive adhesive layer 40 becomes hard and floats. The weight average molecular weight is a value in terms of polystyrene when measured by gel permeation chromatography (GPC).

  In addition, as a commercial item of the said acrylic adhesive, OC3949 (made by Seiden Chemical Co., Ltd.) etc. can be used suitably, for example. Here, OC3949 is an acrylic pressure-sensitive adhesive of an acrylic ester copolymer composed of acrylate-n-butyl and ethyl acrylate.

[Isocyanate curing agent]
The pressure-sensitive adhesive composition contains an isocyanate curing agent. 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 obtained, an appropriate storage elastic modulus is obtained without internal destruction. It is done.

  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. In particular, hexamethylene diisocyanate is preferred because it does not yellow and the ink pot life is good.

  It is preferable that content of the said isocyanate hardening agent in the adhesion layer 40 is 0.1 to 1.0 mass part in conversion of solid content with respect to 100 mass parts of solid content of an acrylic adhesive. When the blending amount is less than 0.1 parts by mass, stress relaxation is exhibited, but internal destruction may occur, which is not preferable. On the other hand, when the content is more than 1.0 part by mass, curing of the pressure-sensitive adhesive layer 40 due to crosslinking becomes excessive, and the print coat layer 32 is likely to be cracked.

[Acrylic copolymer]
As a preferable form, the pressure-sensitive adhesive composition may contain an acrylic copolymer. Thereby, the adhesiveness to the base material 60 at a high temperature is improved, and the cohesiveness of the adhesive layer 40 is improved. In addition, a triblock copolymer curing agent is preferably used because it has an appropriate elastic modulus even at high temperatures. The triblock copolymer consists of a methyl methacrylate polymer block (M) and a butyl acrylate polymer block (A), and the proportion of the butyl acrylate polymer block (A) is 70% by mass or more, The weight average molecular weight of the triblock copolymer is 10,000 to 300,000.

  Although it does not specifically limit as a triblock copolymer which satisfy | fills the said weight average molecular weight and the ratio for which a butyl acrylate polymer block (A) accounts, Specifically, for example, LA2330, LA2140, LA4285 (made by Kuraray) , M51, M52, M53, M52N, and M22N (manufactured by Arkema Co., Ltd.) can be suitably used.

  As for the compounding quantity of an acrylic copolymer, 0-10 mass parts is preferable in conversion of solid content with respect to 100 mass parts of solid content of an acrylic adhesive. When the content of the acrylic copolymer is more than 10 parts by mass, the tackiness or adhesiveness is lowered, which is not preferable.

[Plasticizer]
The pressure-sensitive adhesive composition constituting the pressure-sensitive adhesive layer 40 contains a plasticizer.
By using a plasticizer in combination, it is possible to suppress the generation of cracks in the printing layer 30 over time. Examples of the plasticizer included in the adhesive layer 40 include a phthalate ester plasticizer and an adipate ester plasticizer. The reason why the printed layer 30 is cracked over time will be described later.

  Examples of the phthalate ester plasticizer contained in the pressure-sensitive adhesive composition include di-2-ethylhexyl phthalate (DOP), dimethyl phthalate (DMP), diethyl phthalate (DEP), dibutyl phthalate (DBP), Heptylnonyl phthalate (HNP), di-n-octyl phthalate (DNOP), di-i-octyl phthalate (DCapP), diisononyl phthalate (DINP), di-i-decyl phthalate (DIDP), ditridecyl phthalate (DTDP), dicyclohexyl phthalate (DCHP), butyl benzyl phthalate (BDP), ethyl phthalyl ethyl glycolate (EPEG), butyl phthalyl butyl glycolate (BPBG), etc., one or two of these You may use the above together.

  Examples of the adipate plasticizer contained in the pressure-sensitive adhesive composition include dioctyl adipate (DOA), diisononyl adipate (DINA), diisodecyl adipate (DIDA), dimethyl adipate (DMA), and adipic acid. Examples include diethyl (DEA), diisopropyl adipate (DIPA), dipropyl adipate (DPA), diisobutyl adipate (DIBA), dibutyl adipate (DBA), and the like. Good.

  From the viewpoint of environmentally controlled substances, it is preferable to use an adipate ester plasticizer rather than a phthalate ester plasticizer. Of the adipate ester plasticizers, dioctyl adipate (DOA) is preferably used from the viewpoint of versatility and compatibility with resins.

  It is preferable that the compounding quantity of a plasticizer is 0.1-10 mass parts in conversion of solid content with respect to 100 mass parts of solid content of an acrylic adhesive, and it is more preferable that it is 1-7 mass parts. When the blending amount is less than 0.1 parts by mass, sufficient stress relaxation property is hardly expressed in the obtained adhesive layer 40, and durability may not be obtained. On the other hand, when the content exceeds 10 parts by mass, the stress applied to the print layer 30 is less likely to be relaxed inside the adhesive layer 40, as will be described later, so the print layer 30 maintains its shape due to the stress applied to itself. It can no longer be done and cracks can occur. On the other hand, when the content is more than 10 parts by mass, the adhesive force is significantly reduced by the bleed-out plasticizer, so that it floats on the adhesive layer 40 and is easily peeled off. If it is the said range, since the printing layer 30 comes to be able to maintain a shape for the reason mentioned later, generation | occurrence | production of a crack can be suppressed. Moreover, after transferring the transfer sheet 1 to the base material 60, it is possible to prevent the adhesive layer 40 from floating or peeling off from the base material 60 in a high-temperature and high-humidity environment.

<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 substrate 60. Examples of the material constituting the release film 50 include silicon release type polyethylene terephthalate (PET), untreated polyethylene terephthalate, and polypropylene.
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.

The reason why cracks occur in the print layer 30 over time after the transfer sheet 1 is transferred to the substrate 60 and the function and action of suppressing the occurrence of cracks in the transfer sheet 1 of the present embodiment will be described.
Before the transfer sheet 1 is transferred to the substrate 60, the stress caused by the fluidity of the adhesive layer 40 is transmitted to the flexible release film 50, and is relaxed by the deformation of the release film 50. In this case, since the stress generated by the fluidity of the adhesive layer 40 hardly acts on the printing layer 30, the printing layer 30 can maintain its shape.

  On the other hand, when the transfer sheet 1 is transferred to the base material 60 and the adhesive layer 40 is attached to the hard base material 60, the stress generated by the fluidity of the adhesive layer 40 is not relaxed on the base material 60 side, and the printing layer 30 Act on. Therefore, the print layer 30 (mainly the print coat layer 32) cannot maintain its shape due to the stress generated by the fluidity of the adhesive layer 40, and cracks occur.

  The printing layer 30 may be formed in a state where tension is applied to the base film 10 side. Moreover, after forming the printing layer 30 in the base film 10, shrinkage | contraction etc. may generate | occur | produce by drying of a solvent. In this case, the printing layer 30 is internally stressed along the surface direction of the transfer sheet 1 (the direction in which cracks occur). Therefore, when the stress generated by the fluidity of the adhesive layer 40 acts on the printing layer 30, the stress and the stress applied to the inside interact with each other.

  On the other hand, 0.1-10 mass parts plasticizer is mix | blended with the adhesive layer 40 of this embodiment with solid content conversion with respect to 100 mass parts of solid content of an acrylic adhesive. According to this, since the viscosity of the adhesive layer 40 is lowered when the fluidity is further increased, the stress caused by the fluidity is relieved (reduced). Therefore, after the transfer sheet 1 is transferred to the substrate 60, the stress generated by the fluidity of the adhesive layer 40 hardly acts on the printing layer 30. Thus, in the printing layer 30, since the stress by the fluidity | liquidity of the adhesion layer 40 hardly acts, a shape can be maintained and generation | occurrence | production of a crack is suppressed.

  In order to further improve the fluidity of the adhesive layer 40, it is desirable to increase the thickness of the adhesive layer 40, but it is conceivable that the productivity is lowered. Therefore, by controlling the thickness of the pressure-sensitive adhesive layer 40 in the range of 10 μm or more and 50 μm or less (more preferably 15 μm or more and 30 μm or less), the occurrence of cracks in the printing layer 30 can be suppressed without reducing productivity. Can do.

Second Embodiment
In the transfer sheet 1 according to the first embodiment, the layer serving as a bonding layer between the transfer sheet 1 and the substrate 60 may be an adhesive layer. Examples of the adhesive layer include acrylic adhesives, epoxy adhesives, urethane adhesives, silicon adhesives, UV curable adhesives, and the like.
The layer thickness (dry) of the adhesive layer is preferably 10 μm or more and 500 μm or less, and more preferably 15 μm or more and 300 μm or less.
In addition, in 2nd Embodiment, the layer structure of the transfer sheet 1, the kind of plasticizer to contain, quantity, etc. are the same as 1st Embodiment.

<Third Embodiment>
In the transfer sheet 1 according to the first embodiment, the layer serving as a bonding layer between the transfer sheet 1 and the substrate 60 may be a heat sealant layer. A heat sealing agent layer is a layer which can provide adhesiveness and adhesiveness by heating. Examples of the heat sealant constituting the heat sealant layer include a vinyl acetate heat sealant and a vinyl chloride-vinyl acetate copolymer heat sealant.
The thickness of the heat sealant layer is preferably from 0.1 μm to 50 μm, and more preferably from 0.5 μm to 10 μm.
In addition, in 3rd Embodiment, the layer structure of the transfer sheet 1, the kind of plasticizer to contain, quantity, etc. are the same as 1st Embodiment.

(Manufacturing method of decorative board 100)
Next, the manufacturing method of the decorative board 100 is demonstrated.
The decorative plate 100 is manufactured, for example, by the manufacturer of the decorative plate 100 that purchased the transfer sheet 1.
2 and 3 are cross-sectional views for explaining a method of manufacturing the decorative board 100.

  First, as shown in FIG. 2A, the release film 50 is peeled from the transfer sheet 1. By peeling the release film 50 from the transfer sheet 1, the surface of the adhesive layer 40 opposite to the printed layer 30 (adhesive surface) is exposed. As described above, in the present embodiment, the peel strength between the base film 10 and the release layer 20 is at least twice the peel strength between the release film 50 and the adhesive layer 40. Therefore, when the release film 50 is peeled from the transfer sheet 1, the base film 10 is not peeled from the release layer 20.

  Next, as shown in FIG. 2B, the transfer sheet 1 from which the release film 50 has been peeled is transferred (attached) to the base material 60. The transfer of the transfer sheet 1 to the base material 60 can be continuously performed by, for example, roll-to-roll. Alternatively, the transfer sheet 1 may be manually transferred to the substrate 60 and then pressed with a spatula or the like so as to be in close contact with the surface of the substrate 60.

The substrate 60 includes a substrate main body 61 and a sealer layer 62.
The base body 61 is a transfer target body onto which the transfer sheet 1 is transferred. Examples of the base body 61 include inorganic materials, wood, and resins. Among these, examples of the inorganic material include stone, cement, concrete, glass, metal, and ceramics.
The sealer layer 62 is an undercoat layer for smoothening the surface of the base body 61 and increasing the adhesion between the base body 61 and the transfer sheet 1.

  Next, as shown in FIG. 3C, the base film 10 is peeled from the transfer sheet 1 transferred to the base 60. By peeling the base film 10 from the transfer sheet 1, the surface of the release layer 20 opposite to the printed layer 30 is exposed. In FIG. 3C, the adhesive layer 40 of the transfer sheet 1 and the sealer layer 62 of the substrate 60 are bonded with a strong adhesive force, and therefore, when the substrate film 10 is peeled from the transfer sheet 1, the transfer sheet 1 1 does not peel from the substrate 60.

Next, as shown in FIG. 3D, a weather resistance imparting layer 70 is formed on the exposed surface of the release layer 20. The weather resistance imparting layer 70 is a so-called overprint layer (OP layer) and is a layer that serves as a protective layer of the release layer 20.
The thickness of the weather resistance imparting layer 70 is not particularly limited, but is preferably in the range of 0.1 μm to 500 μm, and more preferably 1 μm to 100 μm.

  As the weather resistance imparting layer 70, for example, a layer containing an ionizing radiation curable resin and a wax can be used. By using an ionizing radiation curable resin, it is possible to eliminate the pressing step for smoothing, which is necessary in the conventional aqueous OP layer.

  The weather resistance imparting layer 70 can be laminated by applying a resin layer forming ink containing an ionizing radiation curable resin and a wax using a coating method such as flexographic printing. The resin layer forming ink may contain an organic solvent as a solvent.

  The ionizing radiation curable resin is a resin that is cured by ionizing radiation such as ultraviolet rays and electron beams. Examples of the ionizing radiation curable resin include a resin obtained by polymerizing and curing a photopolymerizable monomer such as a bifunctional or higher polyfunctional acrylate and a bifunctional or higher polyfunctional methacrylate with a photopolymerization initiator. it can.

The wax is contained in order to adjust the surface state of the weather resistance imparting layer 70. As the wax, synthetic wax, natural wax or the like can be used. Examples of the synthetic wax include polyethylene wax, and examples of the natural wax include petroleum wax such as paraffin wax, animal wax such as beeswax and whale wax, plant wax such as wood wax and rice bran wax, and mineral wax such as montan wax. Can be used.
By passing through the above process, the decorative board 100 by which the transfer sheet 1 was transcribe | transferred to the base material 60 can be obtained.

Next, an Example and a comparative example are shown and this invention is demonstrated further in detail. However, the present invention is not limited to the following examples.
<Example>
As a base film, prepare a 26 μm thick PET film (“Diafoil” manufactured by Mitsubishi Plastics Co., Ltd.) and apply an acrylic-urethane resin composition (“KSI” manufactured by Showa Ink Industries Co., Ltd.) on one side. Thus, a release layer having a film thickness (dry) of 1 μm was formed. On this release layer, printing is performed a plurality of times using a gravure ink ("EIS" Showa Ink Industries Co., Ltd.) comprising an acrylic-vinyl chloride resin composition and a color pigment, and a printed pattern layer 31 as shown in FIG. A print coat layer 32 was formed.

As a release film, a 38 μm-thick PET separator (“E7002” manufactured by Toyobo Co., Ltd.) was prepared. On top of this, 100 parts of an acrylic ester adhesive composition (“OC3949” solid content 39.5% manufactured by Syden Chemical Co., Ltd.) 0.05 part of an isocyanate-based curing agent (“K-130”, solid content 80%, made by Seiden Chemical Co., Ltd.), 0.5 part of an adipic acid ester plasticizer (“DOA”, solid content 100%, made by JPLUS), Was coated with a solution diluted with ethyl acetate so as to have a film thickness (dry) of 30 μm and dried to form an adhesive layer.
And after bonding together the printing coat layer by the side of a base film, and the adhesion layer by the side of a PET separator (peeling film), the transfer sheet of the Example was obtained by curing at room temperature for 7 days.

<Comparative example>
The transfer sheet of the comparative example was obtained on the same conditions as the said Example except not having added the plasticizer (adipic acid ester type plasticizer) to the adhesion layer.

  The above two types of transfer sheets were each transferred onto a 1 mm thick aluminum plate (base material) to prepare a decorative plate, and the decorative plate was heated at 120 ° C. for 1 hour. Then, after the lapse of a predetermined time, the appearance of each decorative board was visually observed. As a result, countless cracks were observed in the printed layer (printed coat layer) of the decorative board to which the transfer sheet of the comparative example in which no plasticizer was added to the adhesive layer. On the other hand, no cracks in the printed layer were observed on the decorative board to which the transfer sheet of the example in which the plasticizer was added to the adhesive layer was transferred.

  In addition, in the decorative board of the comparative example, after peeling the base film from the transfer sheet transferred to the base material, it is difficult to generate cracks in the printed layer by forming the weather resistance imparting layer immediately. It has been confirmed. In the decorative board of the example, since the crack of the printed layer can be suppressed without forming the weather resistance imparting layer, the weather resistance imparting layer is formed after peeling the base film from the transfer sheet transferred to the base material. A margin can be given to the period until.

  In the transfer sheet 1 of the present embodiment, since it is not necessary to laminate a plastic resin layer between the printing layer 30 and the adhesive layer 40 in order to suppress cracks in the printing layer 30, the number of materials, manufacturing processes, and the like increase. Can be suppressed. Moreover, since the transfer sheet 1 of this embodiment does not laminate | stack a plastic resin layer, it can suppress that a sheet | seat becomes thick. Therefore, according to the present invention, it is possible to provide a transfer sheet that can suppress the occurrence of cracks over time without reducing productivity.

  The transfer sheet according to the present invention can give excellent design properties and weather resistance to the transfer target (base material). In addition to building wall materials (exterior materials, interior materials), partitions, doors, window frames, furniture, upholstery, etc., these decorative panels can be used for interior covers for automobiles, railway vehicles, ships, aircraft, etc. It can also be applied to panel materials for signs and outdoor advertisements.

DESCRIPTION OF SYMBOLS 1 Transfer sheet 10 Base film 20 Peeling layer 30 Print layer 40 Adhesive layer 50 Peeling film 60 Base material 70 Weather resistance provision layer

Claims (5)

A releasable support, a printing layer, and a bonding layer are laminated in this order,
The joining layer is a transfer sheet containing a plasticizer. The transfer sheet according to claim 1,
The bonding layer is a pressure-sensitive adhesive layer containing a cured product of a composition containing an acrylic pressure-sensitive adhesive and an isocyanate-based curing agent,
The said plasticizer is a transfer sheet which is 0.1 to 10 mass parts in conversion of solid content with respect to 100 mass parts of solid content of the said acrylic adhesive. The transfer sheet according to claim 1,
The bonding layer is an adhesive layer including a cured product of at least one adhesive selected from an acrylic adhesive, an epoxy adhesive, a urethane adhesive, a silicon adhesive, and an ultraviolet curable adhesive. ,
The said plasticizer is a transfer sheet which is 0.1 mass part or more and 10 mass parts or less in conversion of solid content with respect to 100 mass parts of solid content of the said adhesive agent. The transfer sheet according to claim 1,
The bonding layer is a heat sealant layer containing a vinyl acetate heat sealant or a vinyl chloroacetate sheet sealant,
The said plasticizer is a transfer sheet which is 0.1 mass part or more and 10 mass parts or less in conversion of solid content with respect to 100 mass parts of solid content of a heat seal agent. The transfer sheet according to any one of claims 1 to 4,
The transfer sheet, wherein the plasticizer is an adipate ester plasticizer or a phthalate ester plasticizer.

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