JP7000653B2 - Decorative film, transfer sheet, decorative molded product and its manufacturing method - Google Patents

Description

The present invention relates to a decorative film that can be suitably applied to the surface of a resin molded body or the like, a transfer sheet for forming the decorative film, a decorative molded product, and a method for producing the same.

In the fields of household appliances, automobile interiors, miscellaneous goods, etc., decorative films may be used to decorate the surface of articles such as panels. A transfer method is known as one of the decoration methods using a decoration film.
The transfer method is a method using a transfer sheet in which a transfer layer having a desired pattern or functional pattern is laminated on a release sheet. Specifically, the transfer layer side surface of the transfer sheet is brought into close contact with the surface of the article to be decorated, and then the release sheet is peeled off to transfer the transfer layer to the article, and the transfer layer and the article are integrated. It is a method of obtaining a modified decorative molded product. This transfer layer corresponds to a decorative film.

The decoration method using a decorative film is excellent in mass-producing the same type of decorative molded product, but when the decorative film is partially light-transmitting, it is brought into close contact with the surface of the article. If the decorative film is misaligned, the decorativeness and design of the decorative molded product may be impaired.

For this reason, for example, when a transfer sheet is used, the pattern does not protrude or shift from the light-transmitting portion of the transfer layer, and it is easy to align the pattern with the article to be integrated with the transfer layer. Means have been proposed.
For example, in Patent Document 1, in a partially matte hard coat transfer sheet in which a partial matte layer is formed in an individual transfer region of a transfer layer, an optical marker is provided in a region of a release sheet corresponding to a margin region outside the individual transfer region. It is described that the accuracy of alignment can be improved by forming the marker and reading the marker with an optical sensor.

Japanese Patent No. 4791596

However, even when an optical marker as described in Patent Document 1 is applied, thermal expansion or thermal contraction of each constituent layer of the transfer sheet is performed during the formation of the transfer sheet or the molding of the decorative molded product. It is not always possible to improve the alignment accuracy due to the difference in the degree of alignment. Therefore, when the individual transfer region on which the partial matte layer is formed has light transmission, the pattern protrudes or is misaligned in the light transmitting portion of the transfer layer in the transfer sheet, and the position of decoration in the decorative molded product. The deviation is often visually recognized, and it cannot be said that the yield of such a decorative molded product is always good.

The present invention has been made in view of such a situation, and is used in a decorative molded product using a decorative film in which at least a part of the surface of a light-transmitting portion is matted. It is an object of the present invention to provide a decorative film capable of improving the yield of a product, a transfer sheet for forming the decorative film, a decorative molded product using the decorative film, and a method for producing the same.

The present invention is based on the finding that by forming a predetermined intermediate region between regions having a difference in glossiness in a decorative film, it is possible to suppress the visual recognition of a misalignment of decoration in a decorative molded product. Is.

That is, the present invention provides the following [1] to [13].
[1] The film surface has a first region, a second region in contact with the first region, and a third region in contact with the second region, and the first region has light transmission and the first region. 60 degree mirror gloss Gs ₁ (60 °) of the film surface measured according to JIS Z8741: 1997 of the third region is 60 degree mirror gloss of the film surface measured according to JIS Z8741: 1997 of the third region. The 60-degree mirror gloss Gs ₂ (60 °) of the film surface, which is smaller than Gs ₃ (60 °) and is measured according to JIS Z8741: 1997 in the second region, is the third region from the first region side. A decorative film that gradually increases from Gs ₁ (60 °) to Gs ₃ (60 °) toward the region side.
[2] The above-mentioned [1], wherein the ratio [Gs ₁ (60 °) / Gs ₃ (60 °)] of the Gs ₁ (60 °) to the Gs ₃ (60 °) is 0.6 or less. Decorative film.
[3] The arithmetic mean roughness Ra ₁ at a cutoff value of 0.8 mm on the film surface measured according to JIS B0601: 2001 of the first region is measured according to JIS B0601: 2001. Arithmetic mean at a cutoff value of 0.8 mm on the film surface of the region, which is larger than Ra ₃ and measured according to JIS B0601: 2001 of the second region. Arithmetic mean at a cutoff value of 0.8 mm on the film surface. The decorative film according to the above [1] or [2], wherein the roughness Ra ₂ gradually decreases from Ra ₁ to Ra ₃ from the first region side to the third region side.
[4] The decorative film according to the above [3], wherein Ra ₁ is 0.10 to 0.30 μm and Ra ₃ is less than 0.10 μm.
[5] The decorative film according to any one of [1] to [4] above, wherein the width of the second region is 0.1 to 2.0% of the maximum diameter of the decorative film.

[6] A transfer sheet provided with at least a transfer layer in contact with the release sheet on the release sheet, wherein the transfer surface of the transfer layer is in contact with a first region, a second region in contact with the first region, and a transfer sheet. It has a third region in contact with the second region, the first region has light transmission, and when the transfer layer is transferred to a black smooth plate, it conforms to JIS Z8741: 1997 of the first region. The 60-degree mirror gloss Gs'1 (60 °) on the surface of the transfer layer to be measured is the 60-degree mirror gloss Gs' ₃ (60 °) _on the surface of the transfer layer measured according to JIS Z8741: 1997 in the third region. The 60 degree mirror gloss Gs ' ₂ (60 °) of the transfer layer surface measured according to JIS Z8741: 1997 of the second region, which is smaller than °), is from the first region side to the third region side. A transfer sheet gradually increasing from _{Gs'1 (60 °) to Gs' 3 (} 60 °) toward.
[7] The ratio [Gs' ₁ (60 °) / Gs' ₃ (60 °)] of the _Gs'1 (60 °) to the _Gs'3 (60 °) is 0.6 or less, as described above [6]. ] The transfer sheet described in.
[8] When the transfer layer is transferred to a smooth plate, the arithmetic mean roughness Ra ' ₁ at a cutoff value of 0.8 mm on the surface of the transfer layer measured according to JIS B0601: 2001 of the first region is , The arithmetic mean roughness Ra ' ₃ at a cutoff value of 0.8 mm on the surface of the transfer layer of the third region measured according to JIS B0601: 2001, which is larger than that of JIS B0601: 2001 of the second region. The arithmetic mean roughness Ra'2 at the measured cutoff value of 0.8 mm on the surface of the transfer layer gradually decreases from _Ra'1 to _Ra'3 from the _first region side to the third region side. , The transfer sheet according to the above [7].
[9] The transfer sheet according to the above [8], wherein _Ra'1 is 0.10 to 0.30 μm and _Ra'3 is less than 0.10 μm.
[10] The transfer sheet according to any one of [6] to [9] above, wherein the width of the second region is 0.1 to 2.0% of the maximum diameter of the transfer layer.

[11] A decorative molded product provided with the decorative film according to any one of the above [1] to [5] on a resin molded body.
[12] The decorative molded product according to the above [11], which is a display panel.
[13] The surface of the transfer sheet according to any one of [6] to [10] above is brought into close contact with the surface of the article to be decorated, and then the release sheet is peeled off. A method for producing a decorative molded product, wherein the transfer layer is transferred to the article to obtain a decorative molded product.

According to the present invention, in a decorative molded product using a decorative film in which at least a part of the surface of a light-transmitting portion is matted, it is possible to suppress the visible misalignment of the decoration. can.
Therefore, by using the decorative film, it is possible to improve the yield of the decorative molded product.
Further, according to the transfer sheet of the present invention, such a decorative film and further a decorative molded product can be suitably obtained.

It is a top view which showed an example of embodiment of the decorative film of this invention.

Hereinafter, the decorative film, transfer sheet, and decorative molded product of the present invention will be described in detail with reference to the drawings. The notation of the numerical range of "AA to BB" in this specification means "AA or more and BB or less".

[Decorative film]
FIG. 1 shows an example of an embodiment of the decorative film of the present invention. As shown in FIG. 1, in the decorative film 10 of the present invention, the film surface of the first region 1 having light transmittance, the second region 2 in contact with the first region 1, and the third region 2 in contact with the second region 2. It has a region 3. Then, the 60-degree mirror surface gloss Gs ₁ (60 °) of the film surface measured according to JIS Z8741: 1997 in the first region 1 is measured according to JIS Z8741: 1997 in the third region. The 60 degree mirror surface gloss Gs ₂ (60 °) of the film surface, which is smaller than the 60 degree mirror surface gloss Gs ₃ (60 °) and is measured according to JIS Z8741: 1997 in the second region 2, is the first. It is characterized by gradually increasing from Gs ₁ (60 °) to Gs ₃ (60 °) from the region side to the third region side.

In the decorative film 10 of FIG. 1, the outer circumferences of the first region 1, the second region 2, and the third region 3 are all rectangular, and the first region 1 is surrounded by the second region 2. Although the second region 2 is formed so as to be surrounded by the third region 3, the shape of the decorative film of the present invention and the form of each region are not necessarily limited to this. For example, the first region, the second region, and the third region are sequentially arranged in parallel, or the third region is surrounded by the second region and the second region is surrounded by the first region. May be good.
When the decorative film is used for decorating a display that displays an image or an image in the center, the form as shown in FIG. 1 in which the first region is inside is preferable from the viewpoint of the antiglare effect on the display screen.

The 60-degree mirror surface gloss of the decorative film in the present invention is measured according to JIS Z8741: 1997. Specifically, the back surface of the decorative film 10 is a black smooth plate using a transparent adhesive. It is a measured value of the sample attached to. At this time, in order to prevent interfacial reflection, the difference in refractive index between the layer on the back surface side of the film and the transparent adhesive is preferably 0.15 or less, and more preferably 0.10 or less. Further, the black smooth plate preferably has a total light transmittance of 1% or less in JIS K7361-1: 1997, and more preferably 0%.

The first region 1 of the decorative film 10 has light transmission, and there is a difference between Gs ₁ (60 °) and Gs ₃ (60 °), and Gs ₁ (60 °) is Gs. Less than ₃ (60 °).
The ratio of Gs ₁ (60 °) to Gs ₃ (60 °) [Gs ₁ (60 °) / Gs ₃ (60 °)] is preferably 0.6 or less, more preferably 0.55 or less, and further. It is preferably 0.45 or less.
That is, the film surface of the first region 1 has a matte feeling, and the film surface of the third region 3 has a glossy feeling. In particular, when the decorative film is used for decorating a display, the first area 1 has a matte feeling that exerts an antiglare effect on the display screen, and the third area 3 has the entire display with respect to the display frame. It is preferable to have a glossy feeling that enhances a sense of quality.

Gs ₁ (60 °) is preferably 100% or less from the viewpoint of obtaining a sufficient matte feeling. Further, from the viewpoint of suppressing Gs ₁ (60 °) from being too small to give the impression of whitening, it is preferably 30% or more, more preferably 40 to 90%, still more preferably 50 to 80%. ..

In the first region 1, the article to be decorated that is in contact with the back surface of the decorative film can be visually recognized through the film surface, and the film surface has a matte feeling. preferable. The first region 1 may be colored.
The light transmittance is not particularly limited, and may be such that the desired visibility of the article to be decorated can be obtained from the film surface, and is appropriately determined according to the decoration purpose of the article. For example, when the decorative film is used for decorating a display, the total light transmittance measured according to JIS K7361-1: 1997 in the first region 1 is preferably 85% or more, more preferably. Is 90% or more.

Gs ₃ (60 °) is larger than Gs ₁ (60 °), that is, the third region 3 has a glossy feeling as opposed to the matte feeling of the first region 1.
Gs ₃ (60 °) is preferably 100% or more, more preferably 110 to 200%, from the viewpoint of obtaining a sufficient gloss feeling.
The presence or absence of light transmission in the third region 3 is not limited, and is appropriately determined according to the purpose of decoration of the article to be decorated. Further, the third region 3 may be colored.

Gs ₂ (60 °) at an arbitrary position of the second region 2 is a value of Gs ₁ (60 °) or more and Gs ₃ (60 °) or less, and Gs ₁ from the first region side to the third region side. It gradually increases from (60 °) to Gs ₃ (60 °). In the second region 2, the glossiness is changed in this way, so that the first region 1 having a matte feeling and the third region having a glossy feeling are in a seamless state.
When the matte area and the glossy area are adjacent to each other and the boundary between the two areas is clear, the decoration with the decorative film is only on the order of 100 microns in the decorative molded product. Even when a misalignment occurs, the misalignment of the decoration by the decorative film is visually recognized by the ability of the human eye to discriminate from a general clear viewing distance. On the other hand, in a decorative molded product using the decorative film of the present invention in which the area having a matte feeling and the area having a glossy feeling are seamless, it is difficult to visually recognize such a misalignment. Can be done.
Therefore, even if the alignment accuracy when decorating the article with the decorative film is not always sufficient, it is possible to suppress the decrease in yield due to the protrusion or deviation of the pattern from the first region 1 in the decorative molded product. Is possible.

The degree of gradual increase in the 60-degree mirror gloss may be proportional to the distance from the first region 1, or the rate of increase with respect to the distance may change in the middle. From the viewpoint of suppressing the appearance of the second region 2 as a clear line, the increase rate is small in the vicinity of the first region and the vicinity of the third region, and gradually increases so as to have an inflection in the vicinity of the middle of both regions. It is more preferable to do.
The second region 2 may be colored, and in that case, the shade, lightness, and color tone of the color may be formed between the first region 1 and the third region 3 so as to have a gradation.

It is preferable that the difference in the 60-degree mirror surface gloss of each region of the decorative film 10 is based on the difference in the surface roughness of each region. The matte feeling and glossy feeling of the film surface can be controlled by the surface roughness of the film surface. That is, the larger the arithmetic mean roughness of the film surface is, the more matte feeling is obtained, and conversely, the smaller the arithmetic mean roughness is, the glossy feeling is obtained.
Specifically, the arithmetic mean roughness Ra ₁ at a cutoff value of 0.8 mm on the film surface measured according to JIS B0601: 2001 of the first region 1 is measured according to JIS B0601: 2001. Arithmetic mean roughness at a cutoff value of 0.8 mm on the film surface of 3 regions 3 is larger than Ra ₃ , and is measured according to JIS B0601: 2001 of 2nd region 2 at a cutoff value of 0.8 mm on the film surface. It is preferable that the arithmetic mean roughness Ra ₂ gradually decreases from Ra ₁ to Ra ₃ from the first region side to the third region side.

The arithmetic mean roughness at a cutoff value of 0.8 mm measured according to JIS B0601: 2001 in the present invention is an average value of 20 measurements.
Further, Ra ₂ referred to here is based on the roughness curve of the film surface of the second region 2 measured in a direction parallel to the outer periphery of the first region 1, and is "the first from the first region side. The phrase "gradually decreases toward the three-region side" means that Ra ₂ measured in this way becomes smaller as the distance from the first region 1 to the measurement position increases.

It is preferable that the degree of gradual decrease in the arithmetic mean roughness changes in the same manner as the gradual increase in the 60-degree mirror surface gloss described above. That is, it may be proportional to the distance from the first region 1, or the reduction rate with respect to the distance may change on the way. From the viewpoint of suppressing the appearance of the second region 2 as a clear line, the reduction rate is small in the vicinity of the first region and the vicinity of the third region, and gradually decreases so as to have an inflection near the middle of both regions. It is more preferable to do.

From the viewpoint of obtaining the above-mentioned Gs ₁ (60 °) of the first region 1 by surface unevenness, Ra ₁ is preferably 0.10 to 0.30 μm, more preferably 0.12 to 0.20 μm, and further preferably 0.12 to 0.20 μm. Is 0.13 to 0.18 μm. Regarding the third region 3, it is preferable that there are few irregularities, and from the viewpoint of obtaining the above-mentioned Gs ₃ (60 °), Ra ₃ is preferably 0.10 μm or less, more preferably less than 0.10 μm. More preferably, it is 0.07 μm or less.

The width d ₂ of the second region 2 is appropriately determined according to the decoration of the first region 1 and the third region 3, but the difference in glossiness between the first region 1 and the third region 3 is different in the second region 2. It is preferable that the degree is not clearly visible. From such a viewpoint, d ₂ is preferably 0.1 to 2.0% of the maximum diameter L of the decorative film, more preferably 0.1 to 1.5%, and further preferably 0. It is 1 to 1.0%.

The decorative film of the present invention is preferably formed by using a resin such as a thermoplastic resin, a thermosetting resin, or an ionizing radiation curable resin from the viewpoint of ease of forming a film having each of the above-mentioned regions. As each resin, one of them may be used alone or two or more of them may be used in combination. Of these, an ionizing radiation curable resin is more preferably used from the viewpoint of strength and ease of controlling the film surface shape.

The ionizing radiation curable resin is a resin obtained by causing a curing reaction of polymerization or cross-linking by irradiation with ionizing radiation. The term "ionizing radiation" as used herein means an electromagnetic wave or a charged particle beam having an energy quantum that polymerizes or crosslinks a molecule, and includes ultraviolet rays.
Examples of the ionizing radiation curable resin include a resin obtained by a curing reaction of a compound having an ethylenically unsaturated bond group such as a (meth) acryloyl group, a vinyl group and an allyl group, an epoxy group and an oxetanyl group. Specifically, from the viewpoint of hardness and scratch resistance, acrylic (meth) acrylate resin, urethane (meth) acrylate resin, polyester (meth) acrylate resin, epoxy (meth) acrylate resin, and polyether (meth) acrylate resin. Etc. are preferable, and urethane (meth) acrylate resin is more preferable.

Examples of the thermoplastic resin include (meth) acrylic resin, cellulose resin, urethane resin, vinyl chloride resin, polyester resin, polyolefin, polycarbonate, polyamide, polystyrene, ABS resin and the like.
Examples of the thermosetting resin include (meth) acrylic resin, polyurethane, phenol resin, urea melamine resin, epoxy resin, unsaturated polyester resin, silicone resin and the like.

The decorative film may be composed of a single layer or may be composed of a plurality of layers including a support. In each of these layers, the first region 10 has a desired light transmittance, and Gs ₁ (60 °), Gs ₂ (60 °) and Gs ₃ (60 °) satisfy the above conditions. It may contain additives such as organic particles and inorganic particles. Further, the back surface of the decorative film in contact with the article to be decorated is preferably formed so as to be in close contact with the article so that it can be integrated. For example, an adhesive having heat-sensitive adhesiveness or pressure-sensitive adhesiveness. It may have a layer.

The decorative film can be produced, for example, by forming a layer made of the resin material on a predetermined support by a known coating method or printing method. The formation of the layer on the support is preferably performed using a plate from the viewpoint of forming an accurate and precise surface shape in each region of the film surface. In particular, when the film surface shape is different in each region, it is preferable to use a plate in which a concave-convex shape complementary to the film surface shape is formed in advance.
The decorative film is integrated with the article to be decorated by being attached to the surface of the article to be decorated. As a result, a decorative molded product in which the decorative film is provided on a predetermined article, preferably a resin molded body, can be obtained.
Alternatively, by applying or printing on the matte-processed film substrate using the plates corresponding to the second region and the third region, the exposed portion (matte-processed surface) of the film substrate is designated as the first region. You can get a decorative film. In this case, the second region and the third region may be formed by a transcription method.
Among the methods using a plate, the decorative film of the present invention is more preferably formed by the transfer sheet of the present invention described later from the viewpoint of satisfactorily controlling the physical characteristics of the film surface.

[Decorative molded products]
The article to be decorated with the decorative film of the present invention is not particularly limited. That is, the decorative molded product to which the decorative film is applied is not particularly limited, but the decorative film of the present invention is particularly limited to an image or a decorative film because the first region has light transmission. It can be suitably used in a state where the first region is located on the surface of a display, lighting or the like for displaying an image. Examples of applications of such decorative molded products include display panels for car navigation systems, personal computers, tablet terminals, smartphones, and other household electric appliances.

Some of the decorative molded products are colored or patterned on the side opposite to the surface in contact with the decorative film of the article to be decorated or on the side in contact with the decorative film, or such coloring. Or a pattern may be applied to the back of the decorative film.
In such a decorative molded product, the edge portion of the first region is seen in the direction perpendicular to the film surface of the decorative film, that is, when viewed from the front and when viewed from an oblique direction with respect to the film surface. In, there may be a difference in the impression received from these colorings and patterns. For example, in a display panel, the effect of light emitted diagonally from the display screen is greater when the display screen is viewed from the front than when viewed from the front, and the effect is greater when the display screen is viewed from the front. The color of the colored part and the impression of the pattern may differ depending on when viewed from the direction.
In such a case, according to the decorative film of the present invention in which the second region is provided in contact with the first region, the above-mentioned difference in impression at the edge of the first region can be alleviated. ..
Further, for example, in a display panel or the like, coloring or a pattern may be applied only to a portion corresponding to a third region of a decorative film. In particular, in such a case, since the second region is provided, the impression received from the edges of these colorings and patterns when viewed from the front of the decorative film and when viewed from an oblique direction. It is easy to exert the effect of making it difficult to make a difference.

As described above, when the back surface of the article to be decorated or the decorative film is colored or patterned, the width d ₂ of the second region described above makes a difference in impression at the edge of the first region. It is preferable that it can be sufficiently relaxed. Specifically, the width d ₂ of the second region depends on the refractive index of the material to be decorated and the decorative film, but the surface of the decorative film of the decorative molded product is colored or has a pattern. It may be about the same as the layer thickness up to the applied portion, preferably 0.5 to 1.0 times, and more preferably 0.7 to 1.0 times.

[Transfer sheet]
The decorative film is preferably formed by a transfer sheet. For example, in the case of forming the decorative film 10 shown in FIG. 1, the transfer sheet is provided with at least a transfer layer in contact with the release sheet on the release sheet, and the transfer surface of the transfer layer is the first. It is assumed that the region 1, the second region 2 in contact with the first region, and the first region, the second region, and the third region corresponding to the third region 3 in contact with the second region 2 are provided, respectively. Then, the first region of the transfer layer has light transmittance, and when the transfer layer is transferred to a black smooth plate, the 60-degree mirror gloss of the surface of the transfer layer is measured according to JIS Z8741: 1997 of the first region. It is assumed that the degree Gs ' ₁ (60 °) is smaller than the 60 degree mirror gloss Gs' ₃ (60 °) of the transfer layer surface measured according to JIS Z8741: 1997 in the third region. The ratio of Gs'1 (60 °) to _{Gs'3 (60 °) [Gs' 1 (} 60 °) / Gs' _{3 (} 60 °)] is preferably 0.6 or less.
Further, the 60-degree mirror glossiness Gs'2 (60 °) of the transfer layer surface measured according to JIS Z8741: 1997 in the second region is Gs' ₁ (60 °) from the _first region side toward the third region side. It is assumed that the temperature gradually increases from 60 °) to _Gs'3 (60 °).
That is, the surface of the transfer layer of the transfer sheet corresponds to the surface of the decorative sheet. Therefore, for Gs'1 (60 °), Gs' ₂ (60 °) and Gs' ₃ (60 °) on the surface of the transfer layer, Gs ₁ (60 °) and Gs _{2 (} 60 °) of the decorative sheet, respectively. Since it is the same as the description for 60 °) and Gs ₃ (60 °), it is omitted.

The width of the second region of the transfer layer is preferably 0.1 to 2.0% of the maximum diameter of the transfer layer. This width is also the same as the ratio of d ₂ to L in the above-mentioned decorative film.

Further, it is preferable that the surface of the transfer layer of the transfer sheet has a surface roughness equivalent to that of the decorative sheet. Specifically, when the transfer layer is transferred to a smooth plate, the arithmetic mean roughness Ra ' ₁ at a cutoff value of 0.8 mm on the film surface measured according to JIS B0601: 2001 in the first region is determined. A film measured according to JIS B0601: 2001 in the second region, which is larger than the arithmetic mean roughness _Ra'3 at a cutoff value of 0.8 mm on the surface of the film in the third region measured according to JIS B0601: 2001. It is preferable that the arithmetic mean roughness Ra'2 at a surface cutoff value of 0.8 mm gradually decreases from _Ra'1 to _Ra'3 from the _first region side to the third region side.
Ra'1 is preferably 0.10 to 0.30 μm, more preferably 0.12 to 0.20 μm, from the viewpoint of obtaining the above-mentioned Gs' ₁ (60 °) from the surface unevenness of the _first region. More preferably, it is 0.13 to 0.18 μm. Similarly, Ra'3 is preferably less than 0.10 μm, more preferably 0.07 μm or less, still more preferably 0.07 μm or less, from the viewpoint of obtaining the above-mentioned Gs' ₃ (60 °) from the surface unevenness of the _third region. It is 0.05 μm or less.
Ra'1, Ra'2, and _{Ra'3 on the surface of the transfer layer are also omitted because they are the same as the description of Ra 1, Ra 2 , and Ra 3 of the} decorative sheet, respectively.

On the surface of the transfer layer of the transfer sheet, the adhesive strength between the transfer layer and the release sheet is generally different between regions having different surface roughness. For this reason, when peeling off one end of the release sheet of the transfer sheet that is in close contact with the article to be decorated from the surface of the transfer layer, if the peeling strength is the same, the peeling speed will not be constant and the peeling speed will be rapid. A so-called stop mark is generated at the changed part.
On the other hand, in the transfer layer, a _second region having an arithmetic mean roughness Ra'2 of a value between Ra'1 and Ra'3 is formed between the _first region and the _third region. By doing so, a sudden change in the peeling speed is suppressed, and the effect of suppressing the occurrence of a stop mark can also be obtained.

The transfer layer in the transfer sheet is a layer to be transferred to the article to be decorated, and may be a single layer or may have a laminated structure of two or more layers, but at least a layer in contact with the release sheet. The surface of the decorative sheet is configured to be the surface of the decorative sheet. Therefore, it is preferable that the layer on the surface of the transfer layer is made of the same material as the decorative sheet.

Further, in order to bond the transfer layer to the article to be decorated and integrate it, an adhesive may be used separately, but the back surface of the transfer layer opposite to the release sheet has an adhesive layer. It is preferable to have it. The adhesive layer on the back surface of the transfer layer is usually formed as a heat-sensitive adhesive or pressure-sensitive adhesive layer, and the resin composition constituting the layer is appropriately determined according to the material of the article to be decorated. ..
For example, when the article to be decorated is an acrylic resin, it is preferable to use an acrylic resin as the adhesive layer. When the article to be decorated is polypropylene resin, chlorinated polyolefin resin, chlorinated ethylene-vinyl acetate copolymer resin, cyclized rubber, kumaron-inden resin, etc. are used for the adhesive layer. It is preferable to do so. When the article to be decorated is a polyphenylene oxide-polystyrene resin, a polycarbonate resin, or a styrene resin, the adhesive layer is an acrylic resin or a polystyrene resin having an affinity with these resins. , Polystyrene resin and the like are preferably used.

The transfer layer may be a design layer on which a design is printed or an anchor layer for imparting heat resistance when in-mold molding is performed at a high temperature, depending on the decoration required for the decorative molded product. May have as needed. Each of these layers can be formed of a known constituent material in each layer.

On the other hand, the release sheet is one that is peeled off after the transfer layer is transferred to the article to be decorated, and usually, a release layer having a surface in contact with the transfer layer is formed on the base material.
The release sheet may have another layer such as an antistatic layer provided on the back surface of the base material, if necessary, from the viewpoint of workability when the release sheet is peeled off.
The constituent materials of each layer such as the base material and the release layer are not particularly limited, and a known resin material or the like can be used as the constituent material depending on the material of the transfer layer.

In order to obtain the surface roughness of the transfer layer surface as described above, it is preferable to form a shape complementary to the shape of the transfer layer surface on the surface of the release sheet in contact with the transfer layer surface.
It is preferable to form the surface shape of the release sheet using a plate from the viewpoint of efficiently producing a plurality of release sheets with a constant surface shape. The plate shall be a duplicate of the desired transfer layer surface shape. The plate can be produced by subjecting the mold to etching, sandblasting, cutting, laser processing, or the like.

As a method of forming a plate having a region where the surface roughness changes, for example, a negative photosensitive resin is applied to the mold surface at a portion corresponding to the second region, which is a region where the surface roughness changes. A method can be used in which patterning is performed by exposure using a predetermined photomask in which the light transmittance is gradually changed, and after development, sandblasting is applied to the portion and the portion corresponding to the first region. Further, in the sandblasting process, the grinding amount of the mold surface can be adjusted by using a diffusion nozzle, changing the blasting pressure, or the like. By such a method, a plate in which the surface roughness is appropriately adjusted at a desired portion can be preferably obtained.

Using the plate obtained as described above, a release sheet is produced by forming a release layer made of a predetermined resin material or the like on a substrate by a known coating or printing method such as gravure coating. Can be done. Then, a transfer layer is laminated on the surface of the obtained release sheet by coating, printing, or the like to obtain a transfer sheet.

[Manufacturing method of decorative molded products]
When a transfer sheet is used for the decorative film, the transfer layer is transferred to the article by bringing the surface of the transfer sheet on the transfer layer side into close contact with the surface of the article to be decorated and then peeling off the release sheet. A decorative molded product can be obtained.
Further, it is also possible to manufacture a decorative molded product by in-mold molding in which the article is decorated using a transfer sheet at the same time as the molding of the article to be decorated. In this in-mold molding, the surface of the transfer sheet on the transfer layer side is arranged toward the inside of the molding die, and the constituent resin material of a predetermined article is injection-injected into the mold to form a transfer sheet and a predetermined one. It is integrally molded with the resin in the shape of an article. Then, by peeling off the release sheet of the transfer sheet on the surface of the resin molded body obtained by demolding, a decorative molded product can be obtained. According to such a method, not only a decorative molded product having a flat surface of an article to be decorated can be preferably obtained, but also a decorative molded product having a three-dimensional surface shape such as a curved surface can be preferably obtained.

1 1st area 2 2nd area 3 3rd area 10 Decorative film

Claims (13)

The film surface has a first region, a second region in contact with the first region, and a third region in contact with the two regions.
The first region has light transmission and
The 60 degree mirror gloss Gs ₁ (60 °) of the film surface measured according to JIS Z8741: 1997 in the first region is 60 of the film surface measured according to JIS Z8741: 1997 in the third region. Degree Mirror gloss smaller than Gs ₃ (60 °),
The 60 degree mirror gloss Gs ₂ (60 °) of the film surface measured according to JIS Z8741: 1997 of the second region is Gs ₁ (60 °) from the first region side toward the third region side. ) To Gs ₃ (60 °), a decorative film. The decorative film according to claim 1, wherein the ratio [Gs ₁ (60 °) / Gs ₃ (60 °)] of the Gs ₁ (60 °) to the Gs ₃ (60 °) is 0.6 or less. The arithmetic mean roughness Ra ₁ at a cutoff value of 0.8 mm on the film surface measured according to JIS B0601: 2001 in the first region is measured according to JIS B0601: 2001. Larger than the arithmetic mean roughness Ra ₃ at a surface cutoff value of 0.8 mm,
The arithmetic mean roughness Ra ₂ at a cutoff value of 0.8 mm on the film surface measured according to JIS B0601: 2001 of the second region is Ra ₁ from the first region side toward the third region side. The decorative film according to claim 1 or 2, which is gradually reduced from to Ra ₃ . The decorative film according to claim 3, wherein Ra ₁ is 0.10 to 0.30 μm and Ra ₃ is less than 0.10 μm. The decorative film according to any one of claims 1 to 4, wherein the width of the second region is 0.1 to 2.0% of the maximum diameter of the decorative film. A transfer sheet having at least a transfer layer in contact with the release sheet on the release sheet.
The transfer surface of the transfer layer has a first region, a second region in contact with the first region, and a third region in contact with the second region.
The first region has light transmission and
When the transfer layer is transferred to a black smooth plate,
The 60-degree mirror gloss Gs ' ₁ (60 °) on the surface of the transfer layer measured according to JIS Z8741: 1997 in the first region is measured according to JIS Z8741: 1997 in the third region. 60 degree mirror surface gloss smaller than _Gs'3 (60 °),
The 60 degree mirror gloss Gs'2 (60 °) of the transfer layer surface measured according to JIS Z8741: 1997 of the _second region is Gs' ₁ from the first region side toward the third region side. Transfer sheet gradually increasing from (60 °) to _Gs'3 (60 °). The sixth aspect of claim 6, wherein the ratio [Gs' ₁ (60 °) / Gs' ₃ (60 °)] of the _Gs'1 (60 °) to the _Gs'3 (60 °) is 0.6 or less. Transfer sheet. When the transfer layer is transferred to a smooth plate,
The arithmetic mean roughness Ra ' ₁ at a cutoff value of 0.8 mm on the surface of the transfer layer measured according to JIS B0601: 2001 of the first region is measured according to JIS B0601: 2001. More than the arithmetic mean roughness _Ra'3 at a cutoff value of 0.8 mm on the surface of the transfer layer,
The arithmetic mean roughness Ra'2 at a cutoff value of 0.8 mm on the surface of the transfer layer measured according to JIS B0601: 2001 of the _second region is from the first region side toward the third region side. The transfer sheet according to claim 7, wherein the number is gradually reduced from Ra ' ₁ to Ra ' ₃ . The transfer sheet according to claim 8, wherein _Ra'1 is 0.10 to 0.30 μm and _Ra'3 is less than 0.10 μm. The transfer sheet according to any one of claims 6 to 9, wherein the width of the second region is 0.1 to 2.0% of the maximum diameter of the transfer layer. A decorative molded product provided with the decorative film according to any one of claims 1 to 5 on a resin molded body. The decorative molded product according to claim 11, which is a display panel. The surface of the transfer sheet according to any one of claims 6 to 10 on the transfer layer side is brought into close contact with the surface of the article to be decorated, and then the release sheet is peeled off so that the transfer layer becomes the article. A method for manufacturing a decorative molded product, which obtains a decorative molded product transferred to.

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