JP6922536B2 - Transfer sheet, manufacturing method of transfer sheet and manufacturing method of decorative molded product - Google Patents

Description

The present invention relates to a transfer sheet, a method for producing a transfer sheet, and a method for producing a decorative molded product.

In the fields of household appliances, automobile interiors, miscellaneous goods, etc., the surface of the article may be decorated by the transfer method.
In the transfer method, a transfer sheet having a transfer layer composed of a release layer, a design layer, an adhesive layer, etc. formed on a substrate is brought into close contact with an article to be transferred, and then the substrate is peeled off to be coated. This is a method of decorating by transferring only the transfer layer to the surface of the transfer material.

In the transfer method, by adjusting the composition of the transfer layer, it is possible to give a glossy feeling to the article to be transferred, or conversely, to reduce the glossy feeling and give a matte feeling.
For example, Patent Document 1 describes a release layer containing a matting agent entirely on a substrate sheet, a mask layer partially containing an active energy ray-curable resin, and a release layer and a design layer as transfer layers. A partially matte transfer sheet characterized by the formation of the above is disclosed.

Japanese Patent No. 5095598

When the transfer layer is transferred to the surface of an article to be transferred, alignment is extremely important as described in paragraph 0034 of Patent Document 1.
Conventionally, in the printing field or the like, alignment is performed by printing a pattern for alignment called a register mark and reading the pattern with a sensor. Also in the transfer method, it is conceivable to print the alignment pattern in this way for alignment.

However, there is a problem that it is difficult to print the alignment pattern at an accurate position on the transfer sheet, and it is difficult to transfer the transfer layer to an accurate position of the object to be transferred. Further, when printing a pattern for alignment after the transfer sheet is completed, there is a problem that the number of steps is increased and it is complicated.

In order to solve the above problem, the present inventors have proposed in Japanese Patent Application No. 2016-168148 that the pattern for alignment is arranged on the release sheet. Then, as a result of further studies by the present inventors, in the present configuration, when reading the alignment pattern, it becomes difficult to recognize the pattern due to the layer laminated on the alignment pattern. It turned out that there was room for improvement.

The present invention has been made in view of such circumstances, and is a transfer sheet capable of improving the readability of a pattern for alignment and transferring a transfer layer to an accurate position of an object to be transferred, and manufacturing the transfer sheet. It is an object of the present invention to provide a method and a method for producing a decorative molded product using the transfer sheet.

That is, the present invention provides the following [1] to [3].
[1] A transfer sheet having a transfer layer on a release sheet, wherein the release sheet has a first region for transferring to an object to be transferred and a second region for providing an alignment pattern. The second region of the base material layer has a material layer, and the transfer layer has a convex portion on the surface side on the transfer layer side, and the transfer layer has the convex portion on the surface opposite to the release sheet. A positioning pattern portion having a follow-up protrusion based on the portion is provided, the height h of the convex portion is 1.0 to 6.0 μm, and the distance d between the ends of the convex portion is 10. Transfer sheet, ~ 500 μm.
[2] A step of applying a resin layer forming ink containing an ionizing radiation curable resin composition on a support to form an uncured resin layer, which is complementary to the first region and the second region. A step of shaping an uncured resin layer using a plate having a shape and at the same time irradiating ionizing radiation to cure the shaped resin layer, and forming a release layer on the cured resin layer. A step of applying an ink for forming a release layer, a step of applying an ink for forming a protective layer containing an ionizing radiation curable resin composition on the release layer to form a protective layer, and a step of forming the protection. The method for producing a transfer sheet according to [1], which comprises a step of applying an adhesive layer forming ink on the layer to form an adhesive layer.
[3] A method for producing a decorative molded product, comprising a step of transferring the transfer layer of the transfer sheet according to [1] to an object to be transferred and a step of peeling off the release sheet of the transfer sheet.

According to the present invention, a transfer sheet capable of improving the readability of a pattern for alignment and transferring a transfer layer to an accurate position of an object to be transferred, a method for producing the transfer sheet, and decoration using the transfer sheet. A method for producing a molded product can be provided.

It is sectional drawing which shows one Embodiment of the transfer sheet of this invention. It is a top view which shows one Embodiment of the transfer sheet of this invention. It is a top view which shows one Embodiment that the alignment pattern of this invention is a line-like structure. It is a top view which shows one Embodiment that the alignment pattern of this invention is a dot-like structure. It is a top view which shows one Embodiment of the transfer sheet of this invention. It is a top view which shows one Embodiment of the alignment pattern which has a colored layer of this invention. It is a top view which shows one Embodiment of the alignment pattern which has a colored layer of this invention.

Embodiments of the present invention will be described below with reference to the drawings. However, the drawings are schematic, and the relationship between the thickness and the plane dimensions, the ratio of the thickness of each layer, etc. are different from the actual ones. Therefore, the specific thickness and dimensions should be determined in light of the following explanations. In addition, it goes without saying that the drawings include parts having different dimensional relationships and ratios from each other.

[Transfer sheet]
As shown in FIG. 1, the transfer sheet 100 according to the embodiment of the present invention is a transfer sheet having a transfer layer 20 on the release sheet 10, and the release sheet 10 is to be transferred to a transfer material. the first region R ₁ and having a base layer 11 having a second region R ₂ for providing the positioning pattern, the second region R ₂ of the base layer 11, the surface side of the transfer layer 20 side of the The transfer layer 20 is provided with a positioning pattern portion AL having a convex portion 4 on the surface opposite to the release sheet 10 and a follow-up protruding portion 23 based on the convex portion 4.

<Release sheet>
The release sheet 10 includes a base material layer 11 and a release layer 3. The release sheet 10 is peeled off after the transfer layer 20 is transferred to an object to be transferred such as a resin molded body.

(Base layer)
The base material layer 11 is formed of, for example, the support 1 and the resin layer 2 as shown in FIG. The base material layer 11 may be a single layer of the support 1 or the resin layer 2, or may be composed of three or more layers having layers other than the support 1 and the resin layer 2.
Further, although not shown, the base material layer 11 may have other regions on the surface on the transfer layer 20 side.

《Support》
Examples of the support 1 include polyolefin resins such as polyethylene and polypropylene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, ethylene / vinyl acetate copolymers, vinyl resins such as ethylene / vinyl alcohol copolymers, polyethylene terephthalates, and the like. Represented by polyester resins such as polyethylene naphthalate and polybutylene terephthalate, acrylic resins such as methyl poly (meth) acrylate and ethyl poly (meth) acrylate, styrene resins such as polystyrene, nylon 6 or nylon 66 and the like. Examples thereof include a plastic film made of a resin such as a polyamide resin.
Among these plastic films, a biaxially stretched polyester film having excellent heat resistance, dimensional stability, and alignment suitability is preferable.

The thickness of the support 1 is preferably 12 to 150 μm, more preferably 25 to 100 μm, from the viewpoint of moldability, shape followability, and handling.
In the present specification, the values relating to height, roughness, width and thickness shall be the average value of values measured 10 times unless otherwise specified.

The surface of the support 1 may be subjected to physical treatment such as corona discharge treatment and oxidation treatment, or a coating material called an anchor agent or a primer may be applied in advance in order to enhance the adhesiveness with the resin layer 2 and the like. ..

《Resin layer》
The resin layer 2 is preferably formed of a resin component containing a solid content such as a thermoplastic resin, a cured product of a thermosetting resin composition, and a cured product of an ionizing radiation curable resin composition. The resin component used for forming the resin layer 2 preferably has a solid content of 20 to 100% by mass, more preferably 25 to 95% by mass, and even more preferably 30 to 90% by mass.
Among the above resin components, a cured product of an ionizing radiation curable resin composition which is excellent in strength and can impart an accurate and precise shape because it cures instantly is preferable. Further, from the viewpoint of facilitating the effect of the ionizing radiation curable resin composition, it is preferable that the cured product of the ionizing radiation curable resin composition is contained in an amount of 70% by mass or more among all the resin components constituting the resin layer 2. It is more preferably contained in an amount of 90% by mass or more, further preferably contained in an amount of 95% by mass or more, and further preferably contained in an amount of 100% by mass or more.

The resin layer 2 may be formed by coating, but from the viewpoint of forming an accurate and precise shape, the resin layer 2 may be formed by printing using a plate having a shape complementary to _{the first region R 1} and the second region R _2. It is preferable to form. When the resin layer 2 has other regions, the plate preferably has a shape complementary to the other regions. Details of the method for forming the resin layer 2 using the plate will be described later.

Examples of the thermoplastic resin include acrylic resin, cellulose resin, urethane resin, vinyl chloride resin, polyester resin, polyolefin resin, polycarbonate, nylon, polystyrene and ABS resin.
The thermosetting resin composition is a composition containing at least a thermosetting resin, and is a resin composition that is cured by heating. Examples of the thermosetting resin include acrylic resin, urethane resin, phenol resin, urea melamine resin, epoxy resin, unsaturated polyester resin, silicone resin and the like. In the thermosetting resin composition, a curing agent is added to these curable resins as needed.

The ionizing radiation curable resin composition is a composition containing a compound having an ionizing radiation curable functional group (hereinafter, also referred to as “ionizing radiation curable compound”). Examples of the ionizing radiation curable functional group include an ethylenically unsaturated group such as a (meth) acryloyl group, a vinyl group and an allyl group, and an epoxy group and an oxetanyl group.
As the ionizing radiation curable resin, a compound having an ethylenically unsaturated bond group is preferable. Further, from the viewpoint of suppressing damage to the resin layer in the process of producing the transfer sheet, as the ionizing thermosetting resin, a compound having two or more ethylenically unsaturated bonding groups is more preferable, and among them, ethylenically unsaturated. A polyfunctional (meth) acrylate compound having two or more saturated bond groups is more preferable. As the polyfunctional (meth) acrylate compound, either a monomer or an oligomer can be used.
In addition, ionizing radiation means an electromagnetic wave or a charged particle beam having an energy quantum capable of polymerizing or cross-linking a molecule, and usually, an ultraviolet ray (UV) or an electron beam (EB) is used. Electromagnetic waves such as X-rays and γ-rays, and charged particle beams such as α-rays and ion rays can also be used.

Among the polyfunctional (meth) acrylate-based compounds, the bifunctional (meth) acrylate-based monomers include ethylene glycol di (meth) acrylate, bisphenol A tetraethoxydiacrylate, bisphenol A tetrapropoxydiacrylate, and 1,6-hexane. Examples thereof include diol diacrylate.
Examples of the trifunctional or higher functional (meth) acrylate-based monomer include trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and di. Examples thereof include pentaerythritol tetra (meth) acrylate and isocyanuric acid-modified tri (meth) acrylate.
Further, the (meth) acrylate-based monomer may be one in which a part of the molecular skeleton is modified, and is modified with ethylene oxide, propylene oxide, caprolactone, isocyanuric acid, alkyl, cyclic alkyl, aromatic, bisphenol and the like. Can also be used.

Examples of the polyfunctional (meth) acrylate-based oligomer include acrylate-based polymers such as urethane (meth) acrylate, epoxy (meth) acrylate, polyester (meth) acrylate, and polyether (meth) acrylate.
Urethane (meth) acrylate is obtained, for example, by reacting a polyhydric alcohol or an organic diisocyanate with a hydroxy (meth) acrylate.
Further, the preferable epoxy (meth) acrylate is a (meth) acrylate obtained by reacting a (meth) acrylic acid with a trifunctional or higher functional aromatic epoxy resin, an alicyclic epoxy resin, an aliphatic epoxy resin or the like, and a bifunctional epoxy resin. (Meta) acrylate obtained by reacting the above aromatic epoxy resin, alicyclic epoxy resin, aliphatic epoxy resin, etc. with polybasic acid and (meth) acrylic acid, and bifunctional or higher functional aromatic epoxy resin, It is a (meth) acrylate obtained by reacting an alicyclic epoxy resin, an aliphatic epoxy resin or the like with phenols and (meth) acrylic acid.
The ionizing radiation curable resin may be used alone or in combination of two or more.

When the ionizing radiation curable resin is an ultraviolet curable resin, the resin layer forming ink preferably contains additives such as a photopolymerization initiator and a photopolymerization accelerator.
Examples of the photopolymerization initiator include one or more selected from acetophenone, benzophenone, α-hydroxyalkylphenone, Michler ketone, benzoin, benzyl dimethyl ketal, benzoyl benzoate, α-acyl oxime ester, thioxanthones and the like.
Further, the photopolymerization accelerator can reduce the polymerization inhibition by air at the time of curing and accelerate the curing rate. For example, from p-dimethylaminobenzoic acid isoamyl ester, p-dimethylaminobenzoic acid ethyl ester and the like. One or more selected species can be mentioned.

The thickness of the resin layer 2 is not particularly limited, but is preferably 1 to 15 μm, more preferably 2 to 12 μm, and even more preferably 3 to 10 μm.

(1st area)
The first region R ₁ of the base layer 11 is a region for providing the transfer layer 20 to be transferred to the transfer target.
The surface shape of the first region R ₁ is not particularly limited. The surface shape of the first region R ₁ may have an uneven shape or may be substantially smooth, as shown in FIG. 1, for example.
As shown in FIG. 1, if having an uneven portion 5 in the first region R _1, the object to be transferred, the transfer layer 20 (uneven portion 5 release layer on 3 having a complementary shape of the uneven portion 5 The transfer layer 20) having a complementary shape of the concave-convex shape relaxed by the release layer 3 is transferred, and the uneven shape can be imparted to the surface of the obtained decorative molded product.
Further, when the surface shape of the first region R ₁ is substantially smooth, increasing the substantially can be made smooth, gloss resulting decorative molded article surface shape of the transfer layer 20 has been transferred to the transfer target Can be done.

Since the surface shape given to the decorative molded product differs depending on the purpose, _{the absolute value of the degree of unevenness in the first region R 1} is not particularly limited, but the maximum height roughness Rz is 0.2 to 4.0 μm. It is preferable to set the degree. Similarly, the arithmetic mean roughness Ra is preferably about 0.05 to 2.0 μm.
In the present specification, the maximum height means the maximum height roughness Rz of JISB0601: 2001 at a cutoff value of 0.8 mm, and the average roughness is the arithmetic of JISB0601: 2001 at a cutoff value of 0.8 mm. It means the average roughness Ra. In the present specification, the numerical values relating to the height and the roughness shall be the average value of the values measured at 10 points unless otherwise specified.

Although not shown, it may be formed by dividing the first region R ₁ to two or more locations. In that case, it may be each of the first region R ₁ of the surface shape as different. By forming the first region R ₁ by dividing it into two or more locations and further making _{the surface shape of each first region R 1} different, the design of the decorative molded product can be enhanced.

(Second area)
_{The second region R 2} of the base material layer 11 is a region for providing an alignment pattern (alignment mark) used for transferring to the transferred material.
The second region R ₂ has a partially arranged convex portion 4 that is the basis of the alignment pattern. From the viewpoint of forming an accurate and precise shape, the convex portion 4 is preferably formed on the resin layer 2 by shaping using a plate having a shape complementary to _{the second region R 2.}

The height h of the convex portion 4 is 1.0 to 6.0 μm. Since the height h of the convex portion 4 is less than 1.0 μm, it becomes difficult to maintain the shape of the convex portion 4 each time it is laminated on the convex portion 4, and the convex portion 4 is formed on the surface of the transfer layer 20. It becomes difficult to form the follow-up protrusion 23 as a base. If the follow-up protrusion 23 based on the convex portion 4 cannot be formed on the surface of the transfer layer 20, the photoelectric sensor cannot detect the difference in the amount of light between the convex portion and the concave portion, and the pattern position for alignment can be determined. Cannot be detected. Further, since the height h of the convex portion 4 is more than 6.0 μm, the contact pressure of the convex portion 4 becomes high when laminating on the convex portion 4, and a large amount of ink gets on the convex portion 4. The hem of the layer laminated on the convex portion 4 is likely to spread, and light is diffused at the hem, which adversely affects the alignment. When the height h of the convex portion 4 is more than 6.0 μm, the convex portion 4 may be deformed by the load when laminating on the convex portion 4, and if the convex portion 4 is deformed, the convex portion 4 may be deformed. It becomes difficult to maintain the accuracy of alignment.
The height h of the convex portion 4 is preferably 1.5 to 5.5 μm, more preferably 2.0 to 5.0 μm, from the viewpoint of forming the following protruding portion 23 having a desired shape. It is more preferably 2.5 to 4.5 μm.
The height h of the convex portion 4 does not have to be the same. However, from the viewpoint of facilitating uniform formation of the height H of the follow-up protrusion 23, it is preferable that the height h of the convex portion 4 is the same or an approximate value.
In the present specification, the height h of the convex portion 4 refers to the height h of the convex portion 4 from the reference plane of the base material layer 11 having a cross section obtained by cutting the structure forming the convex portion 4 in a direction orthogonal to the stretching direction of the structure. It refers to the height of the central part.

The distance d between the ends of the convex portions 4 is 10 to 500 μm. Since the distance d between the ends of the convex portions 4 is less than 10 μm, the hem is formed due to the influence of the ink dripping between the ends of the convex portions 4 when laminated on the convex portions 4. , It becomes difficult to maintain the accuracy of alignment. Then, the follow-up protrusions 23 based on the convex portion 4 adjacent to the surface of the transfer layer 20 may be connected to each other, and if the individual follow-up protrusions 23 cannot be recognized, the alignment accuracy is maintained. It becomes difficult to do. Further, since the distance d between the ends of the convex portions 4 is more than 500 μm, the contact pressure of the convex portions 4 becomes high when laminating on the convex portions 4, and a large amount of ink gets on the convex portions 4. , The hem of the layer laminated on the convex portion 4 becomes easy to spread, and light is diffused at the hem, which adversely affects the alignment. Since the distance d between the ends of the convex portions 4 is more than 500 μm, the alignment mark becomes large, and the area of the second region R ₂ must be secured more than necessary, which causes a design problem. be.
The distance d between the ends of the convex portions 4 is preferably 15 to 450 μm from the viewpoint _{of improving the recognition rate of the alignment mark and suppressing the area of the second region R 2 from becoming wider than necessary.} It is more preferably 20 to 400 μm, and even more preferably 25 to 350 μm.
In the present specification, the distance d between the ends of the convex portion 4 means the distance between the ends of the hem of the convex portion 4.

The ratio h / d of the height h of the convex portion 4 and the distance d between the ends of the convex portion 4 is preferably 0.003 to 0.100, and preferably 0.005 to 0.080. More preferably, it is more preferably 0.007 to 0.060.
By setting the ratio h / d to the above range, the height h of the convex portion 4 and the distance d between the ends of the convex portion 4 are well balanced, and a hem is formed between the ends of the convex portion 4. It is less likely to be done and the alignment accuracy can be improved.

The width b of the convex portion 4 is preferably 5 to 200 μm, more preferably 10 to 150 μm, and even more preferably 15 to 100 μm. By setting the width b of the convex portion 4 to 5 μm or more, the strength of the convex portion 4 can be maintained and the convex portion 4 can be easily formed uniformly. Further, by setting the width b of the convex portion 4 to 200 μm or less, it is possible to prevent the area of _{the second region R 2 from becoming wider than necessary.}
In the present specification, the width b of the convex portion 4 means a direction orthogonal to the extending direction of the structure when the structure forming the convex portion 4 is a line-shaped structure, as shown in FIG. The width of the cut cross section. The width b of the convex portion 4 means the width of the cross section cut in the long axis direction of the structure when the structure forming the convex portion 4 is a dot-shaped structure, as shown in FIG. ..

The ratio h / b of the height h of the convex portion and the width b of the convex portion is preferably 0.010 to 0.050, more preferably 0.015 to 0.045, and 0.020. It is more preferably ~ 0.040.
By setting the ratio h / b to 0.010 or more, it is possible to prevent the area of _{the second region R 2 from becoming unnecessarily large.} Further, by setting the ratio h / b to 0.050 or less, it is possible to easily form the following protruding portion 23 that maintains the shape of the convex portion 4.

The convex portion 4 can be formed of a line-shaped structure, a dot-shaped structure, or the like extending in an arbitrary direction, and more preferably the convex portion 4 is formed of a line-shaped structure. The arbitrary direction is not particularly limited and may be an oblique direction (for example, 45 degrees with respect to the width direction of the transfer sheet), but is preferably a direction parallel to any one side of the transfer sheet 100. , The flow direction of the transfer sheet 100 is more preferable. By forming the convex portion 4 in this configuration, alignment can be facilitated.
Further, it is preferable that the directions of the plurality of convex portions 4 are parallel to each other.
Further, the convex portion 4 may be formed continuously without interruption in any direction in the second inner region R _2, but may be one that extends in any direction partially interrupted.

The cross section of the structure forming the convex portion 4 cut in the direction orthogonal to the stretching direction of the structure is preferably substantially square.

The convex portion 4 and the transfer layer 20 described later preferably satisfy the relationship of [height of convex portion / thickness of transfer layer] of 0.1 to 5.0, preferably 0.1 to 3.5. It is more preferable to satisfy the relationship, and it is further preferable to satisfy the relationship of 0.1 to 1.0.
By setting the above ratio to 0.1 or more, it is possible to easily form the following protruding portion 23 based on the convex portion 4 on the surface of the transfer layer 20. Further, by setting the ratio to 5.0 or less, the convex portion 4 is less likely to be deformed by the load, and the alignment accuracy can be easily maintained.

Transfer sheet 100 of the present embodiment may have a second region R ₂ of two or more. When having two or more second regions R ₂ , it is preferable to change the role of each region. For example, when a plurality of second regions R ₂ are provided, it is preferable that one of them is aligned in the width direction and the other is aligned in the flow direction. By configuring the second region R ₂ as described above, alignment in both the width direction and the flow direction becomes possible, and the accuracy of alignment can be improved.
In the transfer sheet 100 of the present embodiment, as shown in FIG. 2, the second region R ₂ is provided on both sides of the first region R ₁ , and the alignment pattern portion (alignment mark) AL is the uneven portion 5. It is preferable that they are provided on both sides. Since the alignment pattern portions AL are provided on both sides of the uneven portion 5, the position of the alignment pattern portion AL with respect to the uneven portion 5 in the width direction can be changed regardless of the number of times the transfer sheet 100 is rewound. It is possible to improve the accuracy of alignment and improve the productivity.

It is preferable that the second region R ₂ is transferred to the object to be transferred and removed at the stage when the decorative molded product is obtained. The timing for removing the second region R ₂ is, for example, (1) a step of slitting the transfer sheet 100 into a long length, (2) a step of die-cutting the transfer sheet 100 into a single sheet, and (3) a transfer sheet. Examples thereof include a trimming step after transferring 100 to the object to be transferred. The transfer layer 20 from the viewpoint of transferring the exact position of the object to be transferred, it is preferable to remove the second region R ₂ at the timing of (3).

(Release layer)
The release sheet 10 of the transfer sheet 100 is formed so as to be peelable at the interface with the transfer layer 20 when it comes into close contact with the object to be transferred. In order to improve the releasability, it is preferable that the releasing sheet 10 has the releasing layer 3 on at least a part of the surface on the side in contact with the transfer layer 20. Further, from the viewpoint of making the in-plane releasability of the transfer sheet 100 uniform, as shown in FIG. 1, the release sheet 10 has the release layer 3 on the entire surface of the surface in contact with the transfer layer 20. Is preferable.

If having a concave-convex portion 5 in the first region R _1, by release layer 3 on the uneven portion 5 is formed, unevenness is reduced, forming a less irregular shape of the high frequency component to the surface of the decorative molded article It is possible to suppress whitening and glare of the decorative molded product.
Here, "glare" refers to a phenomenon in which minute variations in brightness can be seen in the image light due to the uneven structure of the surface. That is, by forming the release layer 3 on the uneven portion 5, glare can be suppressed when the decorative molded product is used on the front surface of a display element such as a liquid crystal display element.

The release layer 3 is preferably composed mainly of resin.
The resin of the release layer 3 is not particularly limited as long as it is a material having a predetermined film strength and a low adhesive force with the transfer layer 20, and is a general-purpose thermoplastic resin, a cured product of a thermosetting resin composition, and the like. Examples thereof include a cured product of an ionizing thermosetting resin composition. Specifically, fluororesins, silicone resins, acrylic resins, polyester resins, polyolefin resins, polystyrene resins, polyurethane resins, cellulose resins, vinyl chloride-vinyl acetate copolymer resins, nitrified cotton. And so on.
Among these, a cured product of the thermosetting resin composition is preferable, and a thermosetting resin composition which is a polyurethane-based resin containing an acrylic polyol and an isocyanate is more preferable.

The release layer 3 may further contain a release agent in order to improve the release property. Examples of the release agent include waxes such as synthetic wax and natural wax. As the synthetic wax, a polyolefin wax such as polyethylene wax or polypyrene wax is preferable.

The thickness of the release layer 3 is preferably 0.1 to 5.0 μm, more preferably 0.2 to 3.0 μm, and even more preferably 0.3 to 1.0 μm.

(Other layers)
The release sheet 10 may have other layers.
Examples of the other layer include an antistatic layer. By having the antistatic layer, the release sheet 10 can suppress the release charge when the release sheet is peeled off, and can improve the workability of transfer.

(Antistatic layer)
The antistatic layer preferably contains an antistatic agent such as an electron conduction type antistatic agent and an ion conduction type antistatic agent, and a binder resin.
The antistatic layer is preferably formed on the surface of the release sheet opposite to the surface in contact with the transfer layer.
The surface resistivity of the antistatic layer is preferably adjusted to the range of ^{1.0 × 10 -9} Ω / □ to 1.0 × 10 ^{-12 Ω / □.}
The antistatic agent may be contained in another layer such as a resin layer to exhibit antistatic properties.

<Transfer layer>
A transfer layer 20 is formed on at least a part of the release sheet 10.
The transfer layer 20 is a layer that is transferred to the object to be transferred. For example, as shown in FIG. 1, the transfer layer 20 has a protective layer 21 and an adhesive layer 22 in order from the side closer to the release sheet 10. The transfer layer 20 has a follow-up protrusion 23 on the surface based on the convex portion 4.
As shown in FIG. 1, the transfer layer 20 is preferably formed on the entire surface of the release sheet 10.

For each layer such as the protective layer 21 and the adhesive layer 22 constituting the transfer layer 20, for example, an ink containing the constituent components of each layer is adjusted, and a coating method such as a gravure coating method or a roll coating method is applied on the release sheet 10. , It can be formed by applying and drying by a printing method such as a gravure printing method or a screen printing method, and curing by irradiating ionizing radiation as necessary.
The ink for forming the transfer layer for forming the transfer layer 20 has a solvent ratio of 90% by mass or less from the viewpoint of facilitating the formation of the follow-up protruding portion 23 that follows the convex portion 4 as a base. Is preferable.

The height H of the follow-up protrusion 23 is preferably 1.0 to 10.0 μm, more preferably 1.5 to 9.0 μm, and even more preferably 2.0 to 8.0 μm. ..
By setting the height H of the follow-up protrusion 23 to 1.0 μm or more, it becomes easy to detect the difference in the amount of light between the convex portion and the concave portion in the alignment performed by the photoelectric sensor. Further, by setting the height H of the follow-up protrusion 23 to 10.0 μm or less, the follow-up protrusion 23 is less likely to be deformed by the load, and the alignment accuracy can be easily maintained.
The heights H of the follow-up protrusions 23 do not have to be the same. However, in the alignment performed by the photoelectric sensor, it is preferable that the heights H of the following protruding portions 23 are all the same or approximate values from the viewpoint that the difference in the amount of light between the convex portion and the concave portion can be detected uniformly and easily.
In the present specification, the height H of the follow-up protrusion 23 is the height of the central portion of the cross section obtained by cutting the structure forming the follow-up protrusion 23 in the direction orthogonal to the stretching direction of the structure. To say.

(Protective layer)
The protective layer 21 has a role of protecting the decorative molded product from abrasion, light, chemicals, and the like after the transfer layer 20 is transferred from the transfer sheet 100 to the object to be transferred.
If having a concave-convex portion 5 release sheets first region R ₁ of 10, protective layer 21 having a complementary shape to the irregular shape is imparted to the surface of the decorative molded article. Further, when the first region R ₁ of the release sheet 10 is substantially smooth, it can be surface substantially smooth protective layer 21 is applied to the surface of the decorative molded article, increasing the gloss of the decorative molded article.

The protective layer 21 preferably contains a resin component such as a thermoplastic resin, a cured product of a thermosetting resin composition, or a cured product of an ionizing radiation curable resin composition as a main component. The main component means 50% by mass or more of the total solid content constituting the protective layer, and the ratio is preferably 70% by mass or more, and more preferably 80% by mass or more.
Further, among the above resin components, a cured product of an ionizing radiation curable resin composition having excellent strength is preferable. Further, from the viewpoint of improving the effect of the ionizing radiation curable resin composition, it is preferable to contain 70% by mass or more of the cured product of the ionizing radiation curable resin composition among all the resin components constituting the protective layer, 90%. It is more preferably contained in an amount of 95% by mass or more, further preferably contained in an amount of 95% by mass or more, and further preferably contained in an amount of 100% by mass or more.
The transfer layer forming ink for forming the protective layer 21 preferably has a solvent ratio of 60 to 90% by mass or less from the viewpoint of facilitating the formation of the following protruding portion 23 based on the convex portion 4. It is more preferably 65 to 90% by mass, and even more preferably 70 to 90% by mass.

The embodiment of the resin component such as the ionizing radiation curable resin composition of the protective layer 21 is the same as the embodiment of the resin component of the resin layer 2 described above.
When a thermosetting resin composition and / or an ionizing radiation curable resin composition is used as the material for forming the protective layer 21, the thermosetting resin is formed at the time of forming the protective layer 21 from the viewpoint of moldability. The composition and / or the ionizing radiation curable resin composition is left in a semi-cured state, and after being transferred to the transferred material, the thermosetting resin composition and / or the ionizing radiation curable resin composition is cured. It is preferable to completely cure.

The protective layer 21 may contain particles such as organic particles and inorganic particles. By containing the particles in the protective layer 21, glare and defects can be made less noticeable due to the expression of internal haze due to the difference in refractive index from the resin component. These particles may be contained in an adhesive layer, an anchor layer, etc., which will be described later, for the same purpose.

Examples of the organic particles include particles composed of polymethylmethacrylate, polyacrylic-styrene copolymer, melamine resin, polycarbonate, polystyrene, polyvinyl chloride, benzoguanamine-melamine-formaldehyde condensate, silicone, fluororesin, polyester resin and the like. Can be mentioned.
Examples of the inorganic particles include particles made of silica, alumina, antimony, zirconia, titania and the like.

The average particle size of the particles is preferably 0.05 to 5.0 μm, more preferably 0.5 to 3.0 μm.
In the present specification, the average particle size is 50% particle size (d50: median size) when the particles in a solution are measured by a dynamic light scattering method and the particle size distribution is expressed by a mass cumulative distribution. The 50% particle size can be measured using, for example, a Microtrac particle size analyzer (manufactured by Nikkiso Co., Ltd.).

The content of the particles is preferably 0.1 to 20 parts by mass, and more preferably 1 to 10 parts by mass with respect to 100 parts by mass of the resin component of the protective layer 21.

The thickness of the protective layer 21 is preferably 0.5 to 30 μm, more preferably 1.0 to 20 μm, and more preferably 2.0 to 10 μm from the viewpoint of the balance between surface hardness and moldability. Is even more preferable.

(Adhesive layer)
The adhesive layer 22 has a role of improving the adhesiveness between the object to be transferred such as a resin molded product and the transfer layer 20 and improving the transfer work.

The surface of the transfer layer 20 is provided with a positioning pattern portion AL having a follow-up protruding portion 23 based on the convex portion 4. When the surface of the transfer layer 20 is composed of the adhesive layer 22, the surface of the adhesive layer 22 is provided with a positioning pattern portion AL having a follow-up protrusion 23 based on the convex portion 4. The follow-up protrusion 23 is formed by following the convex portion 4 by providing a transfer layer 20 composed of a protective layer 21 and an adhesive layer 22 on the convex portion 4 provided on the release sheet 10. It is a part to be treated.

For the adhesive layer 22, it is preferable to use a heat-sensitive or pressure-sensitive resin suitable for the material of the transferred material. For example, when the material of the object to be transferred is an acrylic resin, it is preferable to use an acrylic resin. When the material of the object to be transferred is a polyphenylene oxide polystyrene resin, a polycarbonate resin, or a styrene resin, an acrylic resin, polystyrene resin, polyamide resin, or the like having an affinity for these resins should be used. Is preferable. Further, when the material of the object to be transferred is a polypropylene resin, it is preferable to use a chlorinated polyolefin resin, a chlorinated ethylene-vinyl acetate copolymer resin, a cyclized rubber, or a kumaron indene resin.
Additives such as an ultraviolet absorber and an infrared absorber may be blended in the adhesive layer 22. The ultraviolet absorber may be inorganic or organic, but an organic ultraviolet absorber is preferable from the viewpoint of excellent transparency. Examples of the inorganic ultraviolet absorber include titanium dioxide, cerium oxide, zinc oxide and the like. Examples of organic UV absorbers include benzotriazole-based UV absorbers, triazine-based UV absorbers, benzophenone-based UV absorbers, salicylate-based UV absorbers, benzoate-based UV absorbers, cyanoacrylate-based UV absorbers, and hydroxy. Examples thereof include phenyltriazine-based ultraviolet absorbers and nickel-chelate-based ultraviolet absorbers. Examples of the infrared absorber include titanium oxide, zinc oxide, indium oxide, tin-doped indium oxide (ITO), tin oxide, antimony-doped tin oxide (ATO), zinc sulfide metal oxide-based infrared absorber, and the like.
The adhesive layer forming ink for forming the adhesive layer 22 preferably has a solvent ratio of 80 to 90% or less from the viewpoint of facilitating the formation of the following protruding portion 23 based on the convex portion 4. , 85-90% by mass, more preferably.

The thickness of the adhesive layer 22 is preferably 0.1 to 20 μm, more preferably 0.5 to 15 μm, and even more preferably 1.0 to 10 μm.
The adhesive layer 22 may be configured to include two types of layers, an anchor coat layer and an adhesive layer. When the anchor coat layer and the adhesive layer are included, the thickness of the anchor coat layer is preferably 0.5 to 10 μm, more preferably 1.0 to 8.0 μm, and 2.0 to 6. It is more preferably 0 μm. The thickness of the adhesive layer is preferably 0.1 to 10 μm, more preferably 0.5 to 8.0 μm, and even more preferably 1.0 to 5.0 μm.

(Colored layer)
Although the present invention can be aligned without the colored layer, the colored layer 30 may be provided on the follow-up protrusion 23 as shown in FIG.
The colored layer 30 is provided on the follow-up protrusion 23 of the alignment pattern portion AL provided on the surface of the transfer layer 20. The colored layer 30 has a role of producing a contrast of light transmittance or light reflectance between a portion where the colored layer 30 is present and a portion where the colored layer 30 is not present in the alignment pattern portion AL.
The colored layer 30 is arranged so as to be located at least a part of the alignment pattern portion AL of the transfer layer 20 (adhesive layer 22) as shown in FIG. 6 when the transfer sheet 100 is observed from the plane direction. It is preferable to do so.

As shown in FIG. 7, the colored layer 30 is preferably composed of three parts, a line portion 30a, a solid coating center portion 30b, and a solid coating portion 31.
The light transmittance or the light reflectance is different between the line portion 30a and the solid coating center portion 30b, and the transfer sheet 100 can be aligned in an arbitrary step by utilizing the contrast of the light transmittance or the light reflectance. It becomes. As the light transmittance, any of the transmittance in the normal transmittance direction, the diffusion transmittance, and the total transmittance may be used. Similarly, as the light reflectance, any of the transmittance in the specular reflection direction, the diffuse reflectance, and the total reflectance may be used.
The ratio of the area of the line portion 30a in the colored layer 30 in the second region _{R 2} is preferably 15 to 85%, more preferably from 20% to 80%, more preferably from 30% to 70% .. By setting the ratio of the area of the line portion 30a to the above range, the contrast of the light transmittance or the light reflectance between the solid coating center portion 30b and the solid coating portion 31 can be easily clarified, and the alignment accuracy can be improved. Can be done.
Except the second region _{R 2} of the line portion 30a and the solid fill central portion 30b, it is preferable that the solid color portion 31. Areafill portion 31 may be wider than the second region R ₂ of the line portion 30a is wide is preferably easier to see more alignment pattern portion AL in different width.

The colored layer 30 is composed of, for example, a binder resin and a pigment.
The pigment of the colored layer 30 preferably contains a pigment having a high hiding property. As the pigment having high hiding power, a black pigment such as carbon black is preferable.
The binder resin of the colored layer 30 is not particularly limited, and for example, (meth) acrylic resin, polyurethane resin, polyester resin, polyamide resin, (meth) acrylic acid ester-olefin copolymer resin, vinyl chloride acetate resin, ethylene. Thermoplastic resins such as vinyl acetate copolymer resin (EVA resin), ionomer resin, olefin-α olefin copolymer resin fat; polyurethane resin, polyester resin, acrylic resin, epoxy resin, phenol resin, urea resin, polyester resin , Melamine resin, alkyd resin, polyimide resin, silicone resin, curable resin such as amide functional copolymer, and the like. Here, the curable resin includes a thermosetting resin, an ionizing radiation curable resin, a two-component curable resin, and the like. The binder resin of the colored layer 30 is preferably a thermoplastic resin from the viewpoint of suppressing foil dust.
The colored layer 30 preferably does not contain a curing agent from the viewpoint of suppressing blocking.

The colored layer 30 can be formed by transferring the colored layer forming ink onto the follow-up protrusion 23 of the alignment pattern portion AL by, for example, a transfer method such as melt heat transfer or sublimation heat transfer. As a transfer method for forming the colored layer 30, melt thermal transfer is particularly preferable from the viewpoint of suppressing foil dust.
The colored layer 30 is also formed by applying a colored layer forming ink on the following protruding portion 23 of the alignment pattern portion AL by a printing method such as gravure reverse printing or gravure printing, and then drying the colored layer 30. Can be done. Gravure reverse printing is particularly preferable as a printing method for forming the colored layer 30.

The thickness of the colored layer 30 is preferably 0.3 to 5.0 μm, preferably 0.4 to 4.0 μm, from the viewpoint that the thickness may be adjusted within a range in which contrast for alignment can be obtained. Is more preferable, and 0.5 to 3.0 μm is even more preferable.

(Other layers)
The transfer layer 20 may have other layers.
Examples of other layers include an anchor layer and a printing layer.

(Anchor layer)
The anchor layer is a layer provided as needed to improve heat resistance when placed in a high temperature environment such as in-mold molding. The anchor layer is preferably formed between the protective layer 21 and the adhesive layer 22.

The anchor layer preferably contains a cured product of the curable resin composition.
Examples of the curable resin composition include a thermosetting resin composition and an ionizing radiation curable resin composition.
The embodiment of the thermosetting resin composition and the ionizing radiation curable resin composition of the anchor layer is the same as the embodiment of the thermosetting resin composition and the ionizing radiation curable resin composition of the resin layer.
The thickness of the anchor layer is preferably 0.1 to 6 μm, more preferably 0.3 to 5 μm, and even more preferably 0.5 to 4 μm.
The anchor layer forming ink for forming the anchor layer preferably has a solvent ratio of 70 to 90% by mass or less, preferably 75 to 90% by mass or less, from the viewpoint of facilitating the formation of the following protruding portion 23 based on the convex portion 4. It is more preferably ~ 90% by mass, and even more preferably 80 to 90% by mass.

(Print layer)
The transfer layer 20 may further have a print layer. The printed layer has a role of imparting a desired design property to the decorative molded product.

Printed layer, when observed the transfer sheet 100 from the planar direction, is preferably disposed so as to be positioned on at least a portion of the first region R _1.
Further, the position of the print layer in the thickness direction may be arranged on the adhesive layer 22, may be arranged between the adhesive layer 22 and the protective layer 21, and may be released from the protective layer 21. It may be arranged between the sheet 10 and the sheet 10. From the viewpoint of protection of the print layer and adhesion to the transferred material, it is preferable to arrange the print layer between the adhesive layer 22 and the protective layer 21. Further, from the viewpoint of dealing with small lot products, it is preferable to arrange the printing layer on the adhesive layer 22. When the printing layer is arranged on the adhesive layer 22, the resin component of the printing layer is a resin of the same type as the resin component of the adhesive layer 22 from the viewpoint of making the adhesiveness with the transferred material uniform. It is preferable, and it is more preferable to use the same resin.

The pattern of the printing layer is arbitrary, and examples thereof include wood grain, stone grain, cloth grain, sand grain, circle, quadrangle, polygon, geometric pattern, character, and solid printing.

The printing layer preferably contains a binder resin such as a polyvinyl resin, a polyester resin, an acrylic resin, a polyvinyl acetal resin, and a cellulose resin, and a pigment and / or a dye.
The thickness of the print layer is preferably 0.25 to 20 μm, more preferably 0.5 to 15 μm, and even more preferably 0.7 to 10 μm from the viewpoint of designability.

Although alignment is important when forming the print layer, the print layer can be formed at an accurate position by performing alignment using the alignment pattern portion AL.

[Manufacturing method of transfer sheet]
The method for producing the transfer sheet 100 according to the embodiment of the present invention is a step of applying an ink for forming a resin layer containing an ionizing radiation curable resin composition onto a support 1 to form an uncured resin layer 2. The uncured resin layer 2 is shaped by using a plate having a shape complementary to the first region R ₁ and the second region R ₂ , and at the same time, the shaped resin layer 2 is irradiated with ionizing radiation. The step of applying the release layer forming ink on the cured resin layer 2 and the step of forming the release layer 3 and the step of applying the protective layer forming ink on the release layer 3 A step of forming the protective layer 21 and a step of applying an adhesive layer forming ink on the protective layer 21 to form the adhesive layer 22 are included.

Method for producing a transfer sheet 100 according to an embodiment of the present invention, on the second region R ₂ follower projecting portion 23 formed on a position corresponding to the adhesive layer 22, the ink is applied for coloring layer formation, It is preferable to further include a step of forming the colored layer 30. By further including the step of forming the colored layer 30, the transfer layer 20 having the colored layer 30 on the follow-up protrusion 23 can be obtained.

A plate having a shape complementary to the first region R ₁ and the second region R ₂ is to engrave the surface of the cylinder in a desired shape by, for example, etching, sandblasting, cutting and laser processing, or a combination thereof. Can be obtained by Alternatively, laser engraving, by stereolithography or the like to prepare a plate of male long (plate having a first region R ₁ and the second region R ₂ and the same shape), a material obtained by inverting it to the surface of the cylinder It can be obtained by wrapping. The surface of these plates is preferably hard-plated with chrome or the like.

The transfer sheet 100 is preferably manufactured by multi-imposition from the viewpoint of manufacturing efficiency. The transfer sheet 100 manufactured by multi-imposition in this way is subjected to a transfer step as a long transfer sheet or a single-wafer transfer sheet.

The transfer sheet 100 manufactured by the above step detects the difference in light intensity between the convex portion and the concave portion by using the follow-up protrusion 23 as a pattern for alignment as a convex portion and the end portions of the follow-up protrusion 23 as a concave portion. Is easy, and alignment can be done easily.

Examples of the optional step of aligning include a step of slitting the transfer sheet 100 into a long length, a step of die-cutting the transfer sheet 100 into a single sheet, a step of transferring the transfer sheet 100 to a transfer material, and the like. Be done.

In the step of reading the alignment pattern, the follow-up protrusion 23 as the alignment pattern is used as a convex portion, and the gap between the ends of the follow-up protrusion 23 is used as a concave portion, and the convex portion and the concave portion are used. It is preferable to include a first alignment step of detecting the difference in the amount of light and a second alignment step of detecting the alignment pattern using an image sensor.
In the first alignment step, the pattern position for alignment can be detected by detecting the difference in the amount of light between the convex portion and the concave portion by the regression reflection type laser sensor (photoelectric sensor). The amount of light detected decreases due to the scattering of light in the convex portion. The first alignment step can be performed even when the transfer sheet 100 is flowing, and is a simple alignment step for reading the pattern position for alignment.
In the second alignment step, the alignment pattern position detected in the first alignment step is irradiated with light from a light source, and the specularly reflected light in the alignment pattern is measured by an image sensor such as a camera. Therefore, the boundary between the convex portion and the concave portion can be detected. The transfer sheet 100 can be aligned based on the detected boundary between the convex portion and the concave portion. The second alignment step is basically a step to be performed when the transfer sheet 100 is stopped, such as a step of die-cutting the transfer sheet 100 into a single sheet and a step of transferring the transfer sheet 100 to the object to be transferred. This is an alignment process that accurately reads the alignment pattern.

When the alignment is performed by the light transmittance of the colored layer 30 which is the pattern printing for the alignment, for example, the light source installed below the transfer sheet 100 and the light source installed above the transfer sheet 100 are installed at positions facing each other. Alignment can be performed by detecting with an image sensor.
When the alignment is performed by the light reflectance of the colored layer 30 which is the pattern printing for the alignment, it can be detected by, for example, a light source and an image sensor installed at an arbitrary angle above the transfer sheet 100.

[Manufacturing method of decorative molded products]
The method for producing a decorative molded product according to an embodiment of the present invention includes the above-mentioned step of transferring the transfer layer 20 of the transfer sheet 100 of the present invention to a transfer material and peeling off the release sheet 10 of the transfer sheet 100. It has a process.
Examples of the transferred product include a resin molded product and the like.

The decorative molded product manufactured by the above process can improve the readability of the pattern for alignment and can transfer the transfer layer to the exact position of the object to be transferred, so that the appearance after transfer can be improved. can.

A known transfer method can be used as a method for producing a decorative molded product. For example, (i) a method of attaching a transfer sheet to a preformed object to be transferred, transferring the transfer layer of the transfer sheet, and then peeling off the release sheet of the transfer sheet, (ii) a flat plate-shaped cover. A method of attaching a transfer sheet to a transfer product, transferring the transfer layer of the transfer sheet, peeling off the release sheet of the transfer sheet, and then molding the transferred product on which the transfer layer is laminated, (iii). ) A method of integrating the transferred material with the transfer sheet at the time of injection molding and then peeling off the release sheet of the transfer sheet [in-mold molding (injection molding simultaneous transfer decoration method)] and the like can be mentioned. Above all, according to in-mold molding (injection molding simultaneous transfer decoration method), it is possible to perform decoration molding on a resin molded body having a complicated surface shape such as a three-dimensional curved surface.

As one embodiment of the method for producing a decorative molded product using the transfer sheet of the present invention by in-mold molding, (1) the transfer layer side of the transfer sheet is arranged toward the inside of the in-mold molding mold. The process and (2) the process of injecting resin into the in-mold molding die.
(3) A step of integrating the transfer sheet and the resin to transfer the transfer layer of the transfer sheet onto the surface of the resin molded body (transferred product), and (4) the resin molded body (transferred). A thing having a step of peeling off the release sheet of the transfer sheet after taking out the thing) from a mold.
(1) If the second region R ₂ remains at the time of arranging the steps, the transfer sheet is arranged at an accurate position of the mold by using the alignment pattern portion of the second region R _2. be able to.
After the step (4), it is preferable to trim (remove) unnecessary portions as necessary. (4) When the second region R ₂ remains after the step, it is preferable to trim (remove) the region.

(Resin molded product)
As the resin molded body, it is preferable to use an injection-moldable thermoplastic resin or a thermosetting resin, and various known resins can be used.
When the decorative molded product according to the present invention is produced by in-mold molding, it is preferable to use a thermoplastic resin. Examples of such thermoplastic resins include polystyrene-based resins, polyolefin-based resins, ABS resins (including heat-resistant ABS resins), AS resins, AN resins, polyphenylene oxide-based resins, polycarbonate-based resins, polyacetal-based resins, and acrylic-based resins. Examples thereof include polyethylene terephthalate resin, polybutylene tephthalate resin, polysulfone resin, and polyphenylene sulfide resin.

Next, the present invention will be described in more detail by way of examples, but the present invention is not limited to this example.

[Measurement and evaluation]
The transfer sheets prepared in Examples and Comparative Examples were measured and evaluated as follows. The results are shown in Table 1.

<Optical sensor evaluation>
The amount of light was measured with respect to the alignment marks of the transfer sheets produced in Examples and Comparative Examples using a retroreflective laser sensor (manufactured by KEYENCE, trade name: LV-NH62) as a photoelectric sensor. The ratio of the measured light amount of the part with the alignment mark to the light amount of the part without the alignment mark was calculated, and the following evaluation was performed.
A: Less than 70% B: 70% or more and less than 90% C: 90% or more

<Image sensor evaluation>
An image processing system (manufactured by KEYENCE, product name: XG-8000) and a camera unit (manufactured by KEYENCE, product name: XG-200M) are combined with the alignment marks of the transfer sheets produced in Examples and Comparative Examples. Used and evaluated. Specifically, the alignment mark was irradiated with light using coaxial epi-illumination as a light source, and an image was taken using an image sensor (2 million pixel area sensor). The following evaluation was performed on the imaging result of the alignment mark.
A: The boundary between the convex part and the concave part can be clearly imaged B: The boundary between the convex part and the concave part can be imaged slightly unclearly C: The boundary between the convex part and the concave part cannot be imaged

(Example 1)
1. 1. Preparation of Release Sheet A resin layer forming ink of the following formulation was applied onto a polyethylene terephthalate film having a thickness of 75 μm and dried to form an uncured resin layer having a thickness of 8.0 μm.
<Ink for forming resin layer>
40 parts by mass of ionizing radiation curable resin composition (Acrylic resin manufactured by Kyoei Chemical Co., Ltd.)
・ Photopolymerization initiator 3 parts by mass ・ Methyl ethyl ketone 60 parts by mass ・ Silicone leveling agent 0.5 parts by mass

Next, using a plate having a shape complementary to the following first region R ₁ and second region R ₂ , the uncured resin layer is formed, and at the same time, ionizing radiation is irradiated from the polyethylene terephthalate film side. A base material layer obtained by curing the shaped resin layer was obtained.
<First region _{R 1} and the complementary shapes>
-Smooth <shape complementary to the second region R _2>
-Groove portion having a shape complementary to the convex portion: width 100 μm, depth 5.0 μm
・ Spacing between the ends of the groove: 300 μm
-Number of grooves: 25 <Shape of shaped resin layer>
-Convex: width 100 μm, height 3.0 μm
-Space between the ends of the convex parts: 300 μm
・ Number of grooves: 24

Next, on the resin layer of the obtained base material layer, the mold release layer forming ink of the following formulation was applied to the entire surface, and then dried at 40 ° C. for 72 hours to form a mold release layer having a thickness of 0.5 μm. , Obtained a release sheet.
<Ink for mold release layer formation>
-70 parts by mass of acrylic polyol (manufactured by Soken Chemical Co., Ltd., product name: Thermolac SU100A)
25 parts by mass of isocyanate (manufactured by Mitsui Chemicals, trade name: Takenate D-110N)
-Ethyl acetate 161 parts by mass-Methyl isobutyl ketone 56 parts by mass

2. Preparation of Transfer Layer A coating film is formed by applying the protective layer forming ink of the following formulation on the release sheet obtained in "1" above so that the adhesion amount after drying is 5.0 g / m ^2. After that, the light source was irradiated with an H-bulb, a transport speed of 20 m / min, and an output of 40% using a fusion UV lamp system to semi-cure the protective layer. The integrated light intensity at this time was measured with an illuminance meter (trade name: UVPF-A1) manufactured by Eye Graphics Co., Ltd. and found to be 15 mJ / m ² .
<Ink for forming protective layer>
-Urethane acrylate-based UV curable resin composition 70 parts by mass (manufactured by Dainichiseika Co., Ltd., trade name: Seika Beam HT-X)
(Solid content 35%, toluene / ethyl acetate mixed solvent)
-Urethane acrylate-based UV curable resin composition 30 parts by mass (manufactured by Dainichiseika Co., Ltd., trade name: Seika Beam EXF-HT-1)
(Solid content 40%, toluene / methyl ethyl ketone mixed solvent)

Next, the anchor layer forming ink of the following formulation is applied onto the protective layer so that the adhesion amount after drying is 3.0 g / m ^2, and after forming a coating film, it is dried at 40 ° C. for 72 hours and cured. An anchor layer having a thickness of 2 μm was formed.
<Ink for forming anchor layer>
・ 100 parts by mass of acrylic polyol (manufactured by Dainichi Seika Co., Ltd., trade name: TM-VMAC, solid content 25%)
(Toluene / ethyl acetate / methyl ethyl ketone mixed solvent)
・ Xanmethylene diisocyanate 10 parts by mass (manufactured by Dainichiseika Co., Ltd., trade name: PTC-RC3)
(Solid content 75%, solvent: ethyl acetate)
-Solvent 65 parts by mass (methyl ethyl ketone, diluted so that the solid content is 22%)

Next, the adhesive layer forming ink of the following formulation was applied onto the anchor layer so that the adhesion amount after drying was 2.5 g / m ^2, and a coating film was formed. The coating film was dried to form an adhesive layer having a thickness of 2 μm, and a transfer sheet was obtained.
<Ink for forming adhesive layer>
・ 100 parts by mass of acrylic resin (manufactured by Dainichiseika Co., Ltd., trade name: TM-R600, solid content 20%)
(Ethyl acetate / acetic acid-n-propyl / methyl ethyl ketone mixed solvent)
-Methylethylketone 40 parts by mass-Hydroxyphenyl triazine-based UV absorber 1.28 parts by mass (manufactured by BASF, trade name: Tinuvin479)

<Shape of follow-up protrusion formed on the adhesive layer>
・ Height of follow-up protrusion: 3.0 μm

(Examples 2 to 5, Comparative Examples 1 to 4)
A second region R ₂ shown in Table 1 by using a plate having a complementary shape, and at the same time the uncured resin layer to shape, by irradiating ionizing radiation a polyethylene terephthalate film side, with vehicle resin layer Transfer sheets of Examples 2 to 5 and Comparative Examples 1 to 4 were obtained in the same manner as in Example 1 except that they were cured.

The transfer sheet of the present invention can be suitably used for manufacturing communication devices such as mobile phones, information devices inside automobiles, and decorative molded products such as home appliances.

1: Support 2: Resin layer 3: Release layer 4: Convex portion 5: Concavo-convex portion 10: Release sheet 11: Base material layer 20: Transfer layer 21: Protective layer 22: Adhesive layer 23: Follow-up protrusion 30 : Colored layer 100: Transfer sheet

Claims (12)

A transfer sheet having a transfer layer on a release sheet.
The release sheet has a base material layer having a first region for transferring to a transfer material and a second region for providing an alignment pattern, and the second region of the base material layer includes a base material layer. It has a convex portion on the surface side of the transfer layer side and has a convex portion.
The transfer layer includes a positioning pattern portion having a follow-up protrusion based on the convex portion on a surface opposite to the release sheet.
The height h of the convex portion is 1.0 to 6.0 μm.
A transfer sheet having a distance d between the ends of the convex portions of 10 to 500 μm. The transfer sheet according to claim 1, wherein the ratio h / d of the height h of the convex portion and the distance d between the ends of the convex portion is 0.003 to 0.100. The transfer sheet according to claim 1 or 2, wherein the width b of the convex portion is 5 to 200 μm. The transfer sheet according to any one of claims 1 to 3, wherein the ratio h / b of the height h of the convex portion and the width b of the convex portion is 0.010 to 0.050. The transfer sheet according to any one of claims 1 to 4, wherein the height H of the follow-up protrusion is 1.0 μm or more. The transfer sheet according to any one of claims 1 to 5, which has a colored layer on the follow-up protrusion. The transfer sheet according to any one of claims 1 to 6, wherein the release sheet has a release layer on at least a part of a surface on the side in contact with the transfer layer. The transfer sheet according to any one of claims 1 to 7, wherein the transfer layer has a protective layer on the release sheet side. The transfer sheet according to claim 8, wherein the protective layer contains a cured product of an ionizing radiation curable resin composition. A step of applying an ink for forming a resin layer containing an ionizing radiation curable resin composition on a support to form an uncured resin layer, and a step of forming an uncured resin layer.
A step of shaping the uncured resin layer using a plate having a shape complementary to the first region and the second region, and at the same time, irradiating ionizing radiation to cure the shaped resin layer.
A step of applying a release layer forming ink on the cured resin layer to form a release layer, and a step of forming the release layer.
A step of applying an ink for forming a protective layer containing an ionizing radiation curable resin composition onto the release layer to form a protective layer, and a step of forming the protective layer.
The method for producing a transfer sheet according to claim 1, further comprising a step of applying an adhesive layer forming ink on the protective layer to form an adhesive layer. The transfer sheet according to claim 10, further comprising a step of applying an ink for forming a colored layer on a follow-up protrusion formed at a position corresponding to the second region of the adhesive layer to form a colored layer. Production method. Manufacture of a decorative molded product comprising a step of transferring the transfer layer of the transfer sheet according to any one of claims 1 to 9 to an object to be transferred and a step of peeling off the release sheet of the transfer sheet. Method.

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