JP7071141B2 - Thermally stretchable decorative film for light projection and articles to which it is attached - Google Patents

Description

The present disclosure relates to a heat-stretchable decorative film for light projection and an article to which the film is attached.

Traditionally, decorative films of various designs have been used in automobile interior materials and a wide range of other fields. On the other hand, for example, in the field of automobiles and the like, in recent years, attempts to mount an optical projection type display system for projecting an image or the like on a screen, such as a rear projection display system, have been studied.

In Patent Document 1 (Japanese Unexamined Patent Publication No. 2005-014374), a brilliant squeeze (unevenness) is formed on the upper surface of a transparent or opaque first synthetic resin film, and one layer or a plurality of squeezes are formed on the squeeze. Described is a decorative film used for the interior of an automobile or the like, in which a transparent second synthetic resin film composed of layers is laminated.

In Patent Document 2 (Japanese Unexamined Patent Publication No. 2015-167314), an image projection unit that magnifies and projects an image, a screen unit on which an image is projected, and an image signal are input between the image projection unit and the screen unit. It is equipped with a video processing board that corrects the distortion of the video signal based on the dynamic relative position of the video signal and outputs it to the video projection unit. The video projection unit detects the vibration or acceleration of the video projection unit. The sensor signal is output to the video processing board, the screen unit outputs the result of detecting the vibration or acceleration of the screen unit to the video processing board as the screen unit sensor signal, and the video processing board has a distortion correction circuit. The distortion correction circuit describes a transportation facility equipped with an image display device that calculates a dynamic relative position based on a screen unit sensor signal and an image projection unit sensor signal and corrects the distortion of the image signal.

In Patent Document 3 (Japanese Unexamined Patent Publication No. 2017-074869), the passenger seat side instrument panel provided in front of the passenger seat in the front-rear direction and having no glove box, and the passenger seat side instrument panel are stored and pulled out inside the passenger seat side instrument panel. A vehicle display equipped with a screen arranged behind the vehicle on the passenger seat side instrument panel in the front-rear direction of the vehicle and a projector provided on the front end of the ceiling of the vehicle interior or on the front pillar on the passenger seat side to project an image on the screen. The device is described.

Japanese Unexamined Patent Publication No. 2005-014374 Japanese Unexamined Patent Publication No. 2015-167314 Japanese Unexamined Patent Publication No. 2017-074869

Screens used in light projection display systems generally do not exhibit decorativeness and followability to three-dimensional shapes, so for example, when the screen is applied to the instrument panel of an automobile, it is inside the vehicle. There was a risk of damaging the space design of. On the other hand, when light is projected onto a conventional decorative film used for an instrument panel or the like, a spot called a hot spot having extremely high brightness may occur. Such hot spots may interfere with the uniformity of images, driving of a car, and the like.

The present disclosure provides a heat-stretchable decorative film for light projection, which exhibits decorativeness when light is not projected, functions as a screen when light is projected, and can reduce hot spots, and an article to which the decorative film is attached. ..

According to one embodiment of the present disclosure, a heat-stretchable decorative film for light projection comprising a decorative layer and an adhesive layer, wherein at least one of the decorative layer and the adhesive layer contains light diffusing particles. Further, a heat-stretchable decorative film for light projection is provided in which the total amount of light diffusing particles per unit area in the decorative layer and the adhesive layer is about 2.0 g / m ² or more.

According to another embodiment of the present disclosure, an article in which the above-mentioned decorative film is attached to a substrate component is provided.

According to still another embodiment of the present disclosure, the above-mentioned step of preparing the decorative film and the substrate component, and the decorative film are applied to the surface of the substrate component by a three-dimensional coating molding method, and the decorative film is a substrate. A method for manufacturing an article is provided, which comprises a step of forming an article attached to the surface of a part.

According to the present disclosure, a heat-stretchable decorative film for light projection, which exhibits decorativeness when light is not projected, functions as a screen when light is projected, and can reduce hot spots, and an article to which the decorative film is attached. Can be provided.

The heat-stretchable decorative film for light projection of the present disclosure can be applied to a curved surface portion such as an instrument panel that requires decorativeness, which has not been used as a screen until now.

The above description shall not be deemed to disclose all embodiments of the invention and all advantages relating to the invention.

It is sectional drawing of the heat-stretchable decorative film for light projection by one Embodiment of this disclosure. It is sectional drawing of the heat-stretchable decorative film for light projection by another embodiment of this disclosure. FIG. 5 is a graph relating to a 7/10 value angle of luminance with respect to the total amount of light diffusible particles in the decorative layer and the adhesive layer of the decorative film according to one embodiment of the present disclosure. FIG. 5 is a graph relating to a 9/10 value angle of luminance with respect to the total amount of light diffusible particles in the decorative layer and the adhesive layer of the decorative film according to one embodiment of the present disclosure. It is a graph about the luminance value with respect to the viewing angle in the decorative film for comparison. It is a graph regarding the luminance value with respect to the viewing angle in the decorative film according to one embodiment of the present disclosure. It is a graph about the luminance value with respect to the viewing angle in the decorative film by another embodiment of this disclosure. It is a graph about the luminance value with respect to the viewing angle in the decorative film by another embodiment of this disclosure. It is a graph about the luminance value with respect to the viewing angle in the decorative film by another embodiment of this disclosure. It is a graph about the luminance value with respect to the viewing angle in the decorative film by another embodiment of this disclosure.

The heat-stretchable decorative film for light projection (hereinafter, may be simply abbreviated as "decorative film") according to the first embodiment of the present disclosure includes a decorative layer and an adhesive layer, and these decorative layers and the adhesive layer are included. At least one layer of the adhesive layer contains light diffusible particles, and the total amount of light diffusible particles per unit area in the decorative layer and the adhesive layer is about 2.0 g / m ² or more. At least one layer of the decorative layer and the adhesive layer of the decorative film contains a predetermined amount of light diffusing particles, so that it exhibits decorativeness when light is not projected, and functions as a screen when light is projected. Hot spots due to light can be reduced.

The heat-stretchable decorative film for light projection in the first embodiment can have a 7/10 value angle of brightness of about 20 degrees or more. When the 7/10 value angle of the luminance is set in the relevant range, the hot spot can be further reduced.

The heat-stretchable decorative film for light projection in the first embodiment can have a 9/10 value angle of brightness of about 30 degrees or more. The hot spot can be further reduced by setting the 9/10 value angle of the luminance in the relevant range.

The light diffusing particles used in the heat-stretchable decorative film for light projection in the first embodiment have a difference from the refractive index of the decorative layer or the adhesive layer containing the particles of about 0.05 or more. be able to. Since the light diffusing particles having such a refractive index are more likely to diffuse the light from the light projection unit, the hot spots can be further reduced.

The light diffusible particles used in the heat-stretchable decorative film for light projection in the first embodiment can have an average particle diameter of about 0.1 to about 5.0 μm. The light diffusing particles having such an average particle size can prevent the particles from falling off without adversely affecting the flatness of the adhesive layer and the decorative layer, or do not adversely affect the decorativeness. It is easier to diffuse the light from the light projection unit, and the hot spots can be further reduced.

The light diffusing particles used in the heat-stretchable decorative film for light projection in the first embodiment can include at least one of styrene particles and titanium oxide particles. Such particles are more likely to diffuse the light from the light projection unit and can further reduce hot spots.

The heat-stretchable decorative film for light projection in the first embodiment may further include a protective layer above or above the decorative layer, and / or between the decorative layer and the adhesive layer, a bright layer, or A support layer with a bright layer can be further included. By further applying the protective layer, the brilliant layer and the like, the protective performance and the decorative performance of the decorative film can be further improved.

Since the heat-stretchable decorative film for light projection in the first embodiment can reduce hot spots, it can be used for rear projection.

The heat-stretchable decorative film for light projection according to the first embodiment can be used for in-vehicle use because hot spots are reduced and there is little possibility of causing trouble during operation.

The article in the second embodiment is the one in which the heat-stretchable decorative film for light projection in the first embodiment is attached to a substrate component which is an adherend. The article to which the decorative film of the present disclosure is applied can exhibit decorativeness when light is not projected, and can function as a screen with reduced hot spots when light is projected.

The method for manufacturing an article in the third embodiment is a step of preparing a heat-stretchable decorative film for photoprojection and a substrate component as an adherend in the first embodiment, and the decorative film is three-dimensionally formed. It includes a step of applying to the surface of a substrate component by a coating molding method and forming an article in which a decorative film is attached to the surface of the substrate component. According to such a method, it is possible to obtain an article that can function as a screen with reduced hot spots when light is projected while exhibiting decorativeness when light is not projected.

Hereinafter, the present invention will be described in more detail with reference to the drawings for the purpose of illustrating typical embodiments of the present invention, but the present invention is not limited to these embodiments. With respect to drawing reference numbers, elements with similar numbers in different drawings indicate similar or corresponding elements.

In the present disclosure, the "film" also includes an article called a "sheet".

In the present disclosure, the "storage elastic modulus" is the shear storage elastic modulus G'when the viscoelasticity measurement is performed in a tensile mode with a frequency of 10 Hz using a dynamic viscoelasticity measuring device.

In the present disclosure, "transparent" means that the average transmittance in the visible light region is about 80% or more, preferably about 90% or more.

In the present disclosure, "semi-transparent" means that the average transmittance in the visible light region is less than about 80%, preferably about 75% or less, and does not completely conceal the substrate.

In the present disclosure, "(meth) acrylic" means acrylic or methacrylic, and "(meth) acrylate" means acrylate or methacrylate.

In the present disclosure, the term "abbreviation" means that variations caused by measurement or manufacturing errors are included, and it is intended that a variation of about ± 20% is allowed.

In the present disclosure, the "three-dimensional coating molding method" (TOM) refers to, for example, a step of preparing a film and a substrate component having a three-dimensional shape, and arranging the film and the substrate component in a vacuum chamber having a heating device inside. In the process, the film separates the internal space of the vacuum chamber into two, and the substrate component is placed in one of the separated internal spaces. The process, the process of heating the film by a heating device, and the substrate component The process of creating a depressurized atmosphere for both the arranged internal space and the internal space on the opposite side, and the depressurized atmosphere for the internal space where the substrate parts are arranged, and the substrate while making the internal space on the opposite side a pressurized atmosphere or a normal pressure atmosphere. A molding method including a step of bringing a part into contact with a film and covering an article with the film.

The heat-stretchable decorative film for light projection according to one embodiment of the present disclosure includes a decorative layer and an adhesive layer, and at least one of the decorative layer and the adhesive layer contains light diffusing particles and is decorative. A decorative film in which the total amount of light diffusing particles per unit area in the layer and the adhesive layer is about 2.0 g / m ² or more.

<< Thermally stretchable decorative film for light projection >>
1 and 2 are cross-sectional views of a heat-stretchable decorative film for light projection according to an embodiment of the present disclosure. From the viewpoint of improving hot spots, the decorative film of the present disclosure has a total amount of light diffusing particles per unit area in the decorative layer and the adhesive layer of about 2.0 g / m ² or more and about 2.5 g / m. It is preferably ² or more, or about 3.0 g / m ² or more. From the viewpoint of preventing deterioration of decorativeness and brightness, the total amount is preferably about 20 g / m ² or less, about 15 g / m ² or less, about 10 g / m ² or less, or about 8 g / m ² or less. .. Here, each amount (g / m ² ) of the light diffusing particles per unit area in each layer of the decorative layer and the adhesive layer is determined by the density (g / m ³ ) of the light diffusing particles in each layer and the thickness of each layer (g / m 3). It can be calculated from the value multiplied by m).

<Performance of decorative film>
(7/10 value angle of brightness)
In the heat-stretchable decorative film for light projection of the present disclosure, since at least one of the decorative layer and the adhesive layer contains a predetermined amount of light diffusing particles, it is possible to improve hot spots due to light from the light projection unit. can. The degree of improvement of the hot spot is, for example, the light projection passing through the decorative film with the center of the light projection portion arranged substantially perpendicular to the substantially flat main surface of the decorative film as the starting point (0 degree). The position of the part (viewing angle from the starting point) where the value is 7/10 with respect to the maximum brightness value of the light near the center of the part, that is, the 7/10 value angle of the brightness (hereinafter, simply "7/10 value angle"". In some cases), it can be quantified. Here, the 7/10 value angle of the brightness can be about 20 degrees or more, about 25 degrees or more, or about 30 degrees or more. The upper limit of the 7/10 value angle of the luminance is not particularly limited, but may be, for example, about 85 degrees or less, about 80 degrees or less, or about 75 degrees or less.

(9/10 value angle of brightness)
The degree of improvement of the hotspot is the position of the portion where the value is 9/10 with respect to the maximum luminance value of the light near the center of the light projection portion that has passed through the decorative film, that is, the 9/10 value angle of the luminance (hereinafter, 9/10 value angle). , It may be simply referred to as "9/10 value angle"), and it can be further quantified. Here, the 9/10 value angle of the brightness can be about 30 degrees or more, about 32 degrees or more, or about 35 degrees or more. The upper limit of the 9/10 value angle of the luminance is not particularly limited, but may be, for example, about 60 degrees or less, about 57 degrees or less, or about 55 degrees or less.

<Thickness of decorative film>
The thickness of the decorative film (however, if a release liner is present, the thickness of the release liner is excluded) is not limited to the following, but is, for example, about 25 μm or more, about 50 μm or more, or about. It can be 100 μm or more, and can be about 2 mm or less, about 1 mm or less, or about 500 μm or less. By setting the thickness of the decorative film in the above range, the decorative film can be sufficiently followed even for an article having a complicated shape, and a structure having an excellent appearance can be provided.

<Decorative layer>
The decorative layer of the decorative film of the present disclosure is not limited to the following, but is a color exhibiting a paint color, for example, a light color such as white or yellow, or a dark color such as red, brown, green, blue, gray, or black. Layers, wood grain, stone grain, geometric patterns, leather patterns, pattern layers that give articles such as logos and patterns, relief (embossed patterns) layers with uneven shapes on the surface, and combinations of these. Can be mentioned. The decorative layer is not limited to the following, but is applied directly or via a bonding layer or the like to the entire surface or a part of a layer constituting the decorative film, for example, a protective layer, a bright layer, a support layer or an adhesive layer. be able to.

(Color layer)
The material of the color layer is not limited to the following, but for example, inorganic pigments such as carbon black, yellow lead, yellow iron oxide, red iron oxide, red iron oxide, phthalocyanine pigments such as phthalocyanine blue and phthalocyanine green, and azolakes. Pigments such as pigments, indigo pigments, perinone pigments, perylene pigments, quinophthalone pigments, dioxazine pigments, and organic pigments such as quinacridone pigments such as quinacridone red are binder resins such as (meth) acrylic resins and polyurethane resins. Materials dispersed in can be used. The color layer can be formed by a coating method such as a gravure coat, a roll coat, a die coat, a bar coat, and a knife coat using such a material.

(Pattern layer)
The pattern layer is not limited to the following, but for example, patterns such as patterns, logos, and patterns are protected by using printing methods such as gravure direct printing, gravure offset printing, inkjet printing, laser printing, and screen printing. A layer directly applied to a layer, a bright layer, a support layer, an adhesive layer, etc. may be adopted, and a pattern formed by coating, punching, etching, etc. of a gravure coat, a roll coat, a die coat, a bar coat, a knife coat, etc. Films, sheets, etc. with logos, patterns, etc. can also be used. As the material of the pattern layer, for example, the same material as the material used for the color layer can be used.

(Relief layer)
As the relief layer, a thermoplastic resin film having an uneven shape on the surface by a conventionally known method, for example, embossing, scratching, laser processing, dry etching processing, hot pressing processing, or the like can be used. A relief layer is formed by applying a thermosetting or radiation-curable resin such as a curable (meth) acrylic resin on a release liner having an uneven shape, curing it by heating or irradiation, and removing the release liner. You can also. The thermoplastic resin, thermosetting resin and radiation curable resin used for the relief layer are not particularly limited, but include fluororesins, polyester resins such as PET and PEN, (meth) acrylic resins, polyethylene and polypropylene. Polyolefin-based resins, thermoplastic elastomers, polycarbonates, polyamides, ABS resins, acrylonitrile-styrene resins, polystyrenes, vinyl chlorides, polyurethanes and the like can be used. The relief layer may contain at least one of the pigments used in the color layer.

(Arbitrary component of decorative layer)
The decorative layer of the present disclosure has, as an optional component, an antioxidant, an ultraviolet absorber, a light stabilizer, a heat stabilizer, a dispersant, a plasticizer, a flow improver, and a surfactant, as long as the decorativeness and displayability are not impaired. It can contain activators, leveling agents, silane coupling agents, catalysts and the like.

(Thickness of decorative layer)
The thickness of the decorative layer may vary and is not limited to the following, but may be, for example, about 0.1 μm or more, about 1 μm or more, or about 2 μm or more, about 30 μm or less, about 25 μm or less, Alternatively, it can be about 20 μm or less.

<Adhesive layer>
The decorative film may further include an adhesive layer for attaching the decorative film to the substrate component. As the adhesive layer, for example, a commonly used (meth) acrylic type, polyolefin type, polyurethane type, polyester type, rubber type, solvent type, emulsion type, pressure sensitive type, heat sensitive type, thermosetting type or ultraviolet curable type. Adhesives can be used. The adhesive layer can be applied by a known coating method or the like.

(Arbitrary component of adhesive layer)
The adhesive layer of the present disclosure has, as an optional component, an antioxidant, an ultraviolet absorber, a light stabilizer, a heat stabilizer, a tackifier, a dispersant, a plasticizer, and a flow as long as it does not impair the decorativeness and displayability. It can contain improvers, surfactants, leveling agents, silane coupling agents, catalysts, pigments, dyes and the like.

(Thickness of adhesive layer)
The thickness of the adhesive layer is not limited to the following, but can be, for example, about 5 μm or more, about 10 μm or more, or about 20 μm or more, and about 200 μm or less, about 100 μm or less, or about 80 μm or less. Can be done.

<Light diffusive particles>
At least one of the decorative and adhesive layers of the decorative film of the present disclosure contains light diffusible particles. Since the adhesive layer is generally thicker and closer to the light projection portion side than the decorative layer, it is more preferable that the adhesive layer contains light diffusing particles from the viewpoint of light diffusion efficiency and the like. The light diffusing particles may be any particles exhibiting light diffusivity and are not limited to the following, but for example, the difference from the refractive index of the decorative layer or the adhesive layer that does not contain the particles may be. Organic or inorganic particles having a refractive index of about 0.05 or more, about 0.06 or more, or about 0.07 or more can be used. The difference in the refractive index may be about 1.5 or less, about 1.4 or less, or about 1.3 or less from the viewpoint of brightness and the like. The light diffusing particles may be solid or hollow, and may have a spherical shape or a non-spherical shape such as a plate shape or an elliptical shape. The material of the light diffusing particles is not limited to the following, but for example, silica, mica, barium sulfate, titanium oxide, inorganic materials such as glass, resin materials such as styrene, etc. are used alone or in combination of two or more. Can be used. From the viewpoint of adding to the decorative layer, a transparent material such as styrene or glass, which is highly transparent as a simple substance and which does not hinder the decoration of the color layer or the like, is desirable. From the viewpoint that a large amount of light diffusible particles can be added while suppressing an adverse effect on the formability of the film, a film having a small particle size, for example, titanium oxide having a small particle size is desirable.

(Average particle size of light diffusing particles)
The light diffusible particles have, for example, about 0.1 μm or more, about 0.2 μm or more, from the viewpoint of flatness or dropout resistance in the adhesive layer and the decorative layer, or light diffusivity, that is, improvement of hot spots. Alternatively, it can have an average particle size of about 0.3 μm or more, and can have an average particle size of about 5.0 μm or less, about 4 μm or less, or about 3 μm or less, and particularly one having an average particle size of 1 μm or less. It is called a small particle size.

<Any layer>
The decorative film of the present disclosure is not limited to the following, but may further include, for example, at least one selected from the group consisting of a protective layer, a bright layer, a support layer, a bonding layer, and a release liner.

(Protective layer)
The protective layer material applicable to the decorative film of the present disclosure is not limited to the following, and is, for example, a (meth) acrylic resin containing a polymethylmethacrylate (PMMA) and a (meth) acrylic copolymer, and polyurethane. , Fluorine resins such as ethylene-tetrafluoroethylene copolymer (ETFE), polyvinylidene fluoride (PVDF), methylmethacrylate-vinylidene fluoride copolymer (PMMA / PVDF), silicone resins, polyvinyl chloride (PVC), polycarbonate. (PC), polyolefins such as polyethylene (PE) and polypropylene (PP), polyesters such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), ethylene / acrylic copolymer (EAA) and its ionomers, ethylene-acrylic. Copolymers such as an ethyl acid copolymer and an ethylene-vinyl acetate copolymer can be used alone or in a blend of two or more. Above all, from the viewpoint of chemical resistance and / or weather resistance, it is preferable to use (meth) acrylic resin, polyurethane, fluororesin and polyvinyl chloride, and when incineration or landfill as scratch resistance and / or waste. From the viewpoint of environmental load, the use of (meth) acrylic resin and polyurethane is more preferable. The protective layer may have a multi-layer structure. For example, the protective layer may be a laminate of films formed from the above resin, or may be a multilayer coating of the above resin. The protective layer may have a three-dimensional uneven shape such as an embossed pattern on the entire surface or a part of the surface thereof. From the viewpoint of displaying an image that looks flat, it is preferable that the image does not have an uneven shape. On the other hand, by displaying an image suitable for the uneven shape (for example, along the uneven shape), the design can be further enhanced, and the uneven shape is preferable from the viewpoint of such image display, as in the present disclosure. The advantage of projecting an image on a decorative film is further enhanced.

The protective layer can be formed by coating the resin composition on or above the decorative layer directly or via a bonding layer or the like. The coating of the protective layer can be performed before or after applying the decorative film to the substrate component which is the adherend. Alternatively, a resin composition may be coated on a release liner to form a protective layer film, and the film may be laminated on a decorative layer via a bonding layer. If the decorative layer has adhesiveness to the protective layer film formed on the release liner, the protective layer film can be directly laminated to the decorative layer without going through the bonding layer. The protective layer film is, for example, a resin material such as a curable (meth) acrylic resin composition or a reactive polyurethane composition, and a peeling liner or the like by a knife coat, a bar coat, a blade coat, a doctor coat, a roll coat, a cast coat or the like. Can be formed by coating on and, if necessary, light or heat curing.

As the protective layer, a film formed in advance by extrusion, stretching, or the like may be used. Such a film can be laminated to a decorative layer via a bonding layer. Alternatively, if the decorative layer has adhesiveness to such a film, the film can be laminated directly to the decorative layer without going through a joining layer. By using a film having a high flatness as the film, an appearance having a higher surface flatness can be given to the article (structure). The protective layer can also be formed by extruding multiple layers with other layers. As another layer, for example, a (meth) acrylic film can be used. As the (meth) acrylic film, a resin containing polymethylmethacrylate (PMMA), butylpolyacrylic acid, (meth) acrylic copolymer, ethylene / acrylic copolymer, ethylene vinyl acetate / acrylic copolymer and the like is formed into a film. Can be used as. The (meth) acrylic film has excellent transparency and / or scratch resistance, is resistant to heat and / or light, and is less likely to cause discoloration and / or gloss change even when used outdoors. In addition, it has excellent molding processability without using a plasticizer and can be deep-drawn, and it is also excellent in stain resistance because it does not require the use of a plasticizer. In particular, one containing PMMA as a main component is preferable. For example, it is formed when a (meth) acrylic resin having excellent scratch resistance or the like is used as the other layer and a fluororesin such as ETFE, PVDF, PMMA / PVDF or the like having excellent chemical resistance or the like is used as the protective layer. The protective layer can have the performance of both layers.

a. Optional component of the protective layer The protective layer of the present disclosure includes, as an optional component, a filler, an antioxidant, an ultraviolet absorber, a light stabilizer, as long as it does not impair the protective performance, decorativeness, displayability, etc. according to the application. It can contain heat stabilizers, hard coat materials, gloss-imparting agents, dispersants, plasticizers, flow improvers, surfactants, leveling agents, silane coupling agents, catalysts, pigments, dyes and the like. Among them, it is located in the lower layer by using benzotriazole, an ultraviolet absorber such as Tinuvin (trademark) 400 (manufactured by BASF), and a hindered amine light stabilizer (HALS) such as Tinuvin (trademark) 292 (manufactured by BASF). It is possible to effectively prevent discoloration, fading, deterioration and the like of a coloring material (particularly an organic dye or pigment having a relatively high sensitivity to light such as ultraviolet rays) contained in a decorative layer or the like. The hard coat material may be contained in the protective layer, or may be separately coated on the protective layer and applied as the hard coat layer.

The protective layer may be partially translucent or opaque, but is preferably transparent from the viewpoint of displayability of an image, an image, or the like. From the viewpoint of protective performance such as transparency and chemical resistance of the protective layer, pigments, fillers or the above-mentioned light diffusing particles having a size that contributes to light scattering are not included in the protective layer. Is preferable. Rather than blending the light diffusing particles in the protective layer, it is better to blend it in the decorative layer and / or the adhesive layer that is closer to the light projection portion side of the light projection device and is protected by the protective layer. It is possible to prevent deterioration of the protective performance and decorativeness of the film, and it is possible to further reduce hot spots.

b. Thickness of Protective Layer The thickness of the protective layer may vary, but may be, for example, about 1 μm or more, about 5 μm or more, or about 10 μm or more, about 200 μm or less, about 100 μm or less, or about 80 μm or less. May be. When the decorative film is applied to an article having a complicated shape, it is advantageous that the protective layer is thin from the viewpoint of shape followability, and for example, it is preferably about 100 μm or less, or about 80 μm or less. On the other hand, when imparting high chemical resistance, weather resistance, scratch resistance and the like to an article, it is advantageous that the protective layer is thick, for example, it is preferably about 5 μm or more, or about 10 μm or more. ..

c. Storage Modulus of Protective Layer In some embodiments, the storage modulus of the protective layer is approximately 1.0 × 10 ⁶ Pa in the temperature range of 110 ° C to 150 ° C when measured under conditions of frequency 10 Hz and tensile mode. The above may be about 1.5 × 10 ⁶ Pa or more, or about 2.0 × 10 ⁶ Pa or more, and about 1.5 × 10 ⁸ Pa or less or about 1.3 × 10 ⁸ Pa or less. May be good. When the protective layer has a multi-layer structure, the storage elastic modulus of the protective layer means one value observed for the entire multi-layer structure in which the storage elastic moduli of the individual layers are combined. When the storage elastic modulus of the protective layer is within the above range, it is possible to prevent damage to the decorative layer, the bright layer, etc. when stress, heat, etc. are applied to the decorative film or when the decorative film is deformed. can.

d. Scratch resistance The scratch resistance of the decorative film provided with the protective layer can be evaluated by the pencil hardness according to JIS K5600-5-4. In one embodiment, the decorative film has an adhesive layer of the decorative film applied and fixed on a glass plate, and the pencil hardness when the protective layer is scratched at a speed of 600 mm / min is 6B or more, 5B or more, 4B. It can be more than or equal to 3B or more.

(Glow layer)
The bright layer is not limited to the following, but is a vacuum on the entire surface or a part of the layer constituting the decorative film, for example, on the decorative layer of the protective layer provided with the decorative layer or on the support layer described below. Metals selected from aluminum, nickel, gold, silver, copper, platinum, chromium, iron, tin, indium, titanium, lead, zinc, germanium, etc. formed by vapor deposition, sputtering, ion plating, plating, etc., or It may be a layer containing these alloys or compounds. The thickness of the bright layer can be appropriately selected depending on the required decorativeness, brightness, and the like.

Since the decorative film of the present disclosure can also function as a screen at the time of light projection, when a bright layer is applied, the bright layer is preferably a layer capable of transmitting light from the light projection unit.

(Support layer)
The decorative film of the present disclosure may include a decorative layer and / or a support layer to which a bright layer may be applied. As the support layer, various resins such as (meth) acrylic resin containing polymethylmethacrylate (PMMA), polyurethane (PU), polyvinyl chloride (PVC), polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer ( ABS), Polyethylene (PE), Polyethylene (PP) and other polyolefins, Polyethylene terephthalate (PET), Polyethylene naphthalate (PEN) and other polyesters, ethylene-acrylic acid copolymers, ethylene-ethyl acrylate copolymers, ethylene -A copolymer such as a vinyl acetate copolymer or a mixture thereof can be used. From the viewpoint of strength, impact resistance and the like, polyurethane, polyvinyl chloride, polyethylene terephthalate, acrylonitrile-butadiene-styrene copolymer and polycarbonate can be advantageously used as the support layer. The support layer can also serve to provide uniform elongation during molding and / or to more effectively protect the article (structure) from external punctures, impacts and the like. Surface treatments such as primer treatment, corona treatment, plasma treatment, and flame treatment may be applied to the support layer.

a. Optional components of the support layer The support layer of the present disclosure includes antioxidants, ultraviolet absorbers, fillers, light stabilizers, heat stabilizers, dispersants, etc. as optional components as long as they do not impair decorativeness and displayability. It can contain plasticizers, flow improvers, surfactants, leveling agents, silane coupling agents, catalysts, pigments, dyes and the like. The support layer may be partially translucent or opaque, but is preferably transparent from the viewpoint of displayability of an image or video, and is suitable for decorativeness or brilliance in the decorative layer or brilliant layer. It is preferable that the surface of the support layer is substantially flat in consideration of the influence of the above. Therefore, from the viewpoint of transparency, decorativeness, brilliance, etc., pigments, fillers, or the above-mentioned light diffusing particles having a size that contributes to light scattering and surface unevenness are contained in the support layer. It is preferable not to.

b. Thickness of support layer The thickness of the support layer may vary, but from the viewpoint of formability, strength, impact resistance, etc. of the decorative film, it is generally about 10 μm or more, about 20 μm or more, or about 50 μm or more. It can be about 500 μm or less, about 200 μm or less, or about 100 μm or less.

c. Storage Modulus of Support Layer In some embodiments, the storage modulus of the support layer is approximately 1.0 × 10 ⁶ Pa in the temperature range of 110 ° C to 150 ° C when measured under conditions of frequency 10 Hz and tensile mode. The above may be about 1.5 × 10 ⁶ Pa or more, or about 2.0 × 10 ⁶ Pa or more, and about 1.5 × 10 ⁸ Pa or less or about 1.3 × 10 ⁸ Pa or less. May be good. When the storage elastic modulus of the support layer is within the above range, it is possible to prevent the decorative layer or the bright layer from being damaged when stress, heat, or the like is applied to the decorative film or when the decorative film is deformed. ..

The support layer may have a single layer or a multi-layer structure. When the support layer has a multi-layer structure, the storage elastic modulus of the support layer means one value observed for the entire multi-layer structure in which the storage elastic moduli of the individual layers are combined.

(Joining layer)
A bonding layer (sometimes referred to as a "primer layer" or the like) may be used to bond the layers constituting the decorative film. As the bonding layer, for example, a commonly used (meth) acrylic type, polyolefin type, polyurethane type, polyester type, rubber type, solvent type, emulsion type, pressure sensitive type, heat sensitive type, thermosetting type or ultraviolet curable type. Adhesives can be used. The bonding layer can be applied by a known coating method or the like.

a. Optional components of the bonding layer The bonding layer of the present disclosure has, as an optional component, an antioxidant, an ultraviolet absorber, a light stabilizer, a heat stabilizer, a tackifier, and a dispersant as long as it does not impair the decorativeness and displayability. , Plasticizers, flow improvers, surfactants, leveling agents, silane coupling agents, catalysts, pigments, dyes and the like.

b. Thickness of the bonded layer The thickness of the bonded layer can be, for example, about 0.05 μm or more, about 0.5 μm or more, or about 5 μm or more, and can be about 100 μm or less, about 50 μm or less, or about 20 μm or less. be able to.

(Peeling liner)
Any suitable release liner can be used to protect the adhesive layer. Typical release liners include those prepared from paper (eg, kraft paper) or polymer materials (eg, polyolefins such as polyethylene or polypropylene, polyesters such as ethylene vinyl acetate, polyurethane, polyethylene terephthalate, etc.). The release liner may be coated with a layer of a release agent such as a silicone-containing material or a fluorocarbon-containing material, if necessary.

a. Thickness of the release liner The thickness of the release liner can be, for example, about 5 μm or more, about 15 μm or more, or about 25 μm or more, and can be about 300 μm or less, about 200 μm or less, or about 150 μm or less.

<Use>
The heat-stretchable decorative film for light projection of the present disclosure exhibits decorativeness when light is not projected, and has the ability to function as a screen when light is projected. Therefore, for example, vehicles such as automobiles and railways, ships, etc. It can be used for interior or exterior members of aircraft, home appliances, building materials, show windows, showcases, and the like. The heat-stretchable decorative film for light projection of the present disclosure also exhibits a performance capable of reducing hot spots, and is therefore particularly suitable for use in interior members such as instrument panels (instrument panels) of automobiles. When the decorative film is applied to, for example, an instrument panel portion of an automobile having a curved surface shape, a rear projection display system or the like can be used as necessary without deteriorating the space design inside the automobile or the conventional appearance as it is. It is also possible to project information such as an image or a video from the instrument panel on the instrument panel.

<< Manufacturing method of heat-stretchable decorative film for light projection >>
The decorative film is, for example, a method of coating a decorative layer or an adhesive layer on a release liner such as a PET film whose surface has been peeled off, or on a protective layer or a support layer constituting the decorative film. It can be manufactured by forming each of them using the above-mentioned materials and laminating them as needed via a bonding layer. Alternatively, each layer may be sequentially laminated on one release liner by repeating a coating step and, if necessary, a drying and / or curing step. It is also possible to extrude the material of each layer into multiple layers to form a decorative film. An example of the method for producing a heat-stretchable decorative film for photoprojection of the present disclosure will be exemplified with reference to FIGS. 1 and 2, but the method for producing a decorative film is not limited thereto.

A decorative layer (120, 220) is applied onto a peeling liner (not shown) using a gravure ink and a gravure coating method, and if necessary, a drying and / or curing step is further applied to obtain a laminate A. Form. On another release liner (not shown), a (meth) acrylic resin such as PMMA, a fluororesin such as PMMA / PVDF, etc. are applied using a coating method, a single-layer or multi-layer extrusion method, etc., and if necessary. The drying and / or curing steps are further applied to form the laminate B provided with the protective layer (110, 210). The decorative layer of the laminated body A and the protective layer of the laminated body B are bonded to each other by heating and / or pressing as necessary, directly or via a bonding layer, to form the laminated body C. Next, when the bright layer (230) as shown in FIG. 2 is applied, after removing the release liner on the decorative layer side of the laminated body C, the bright layer (230) is used as a decorative layer by a vapor deposition method or the like. The laminated body D may be applied directly on the support layer (240) or via a bonding layer, or the bright layer (230) may be applied directly or via a bonding layer on the support layer (240) by a thin-film deposition method or the like. The decorative layer of the laminated body C and the bright layer of the laminated body D may be formed and bonded to each other by heating and / or pressurizing, if necessary, directly or via a bonding layer. Further, on another release liner (not shown), an adhesive layer (150, 250) is applied by a coating method or the like, and if necessary, a drying and / or curing step is further applied to obtain a laminated body F. Form. The adhesive layer of the laminate F is attached to the decorative layer of the laminate C, or if present, the bright layer or the support layer by heating and / or pressurizing as necessary, and has heat stretchability for light projection. Form a decorative film (100, 200).

<< Article with heat-stretchable decorative film for light projection >>
According to one embodiment of the present disclosure, an article in which a decorative film is coated on a substrate component is provided. For example, by applying a decorative film to a substrate component by insert molding (IM) or a three-dimensional overlay method (TOM), an article to which the decorative film is attached can be formed. In another embodiment, the thermoplastic material to be the substrate component is extruded onto the decorative film to form an article in which the decorative film and the extruded thermoplastic material are united. The IM, TOM, and extrusion methods can be performed by conventionally known methods. The decorative film of the present disclosure can be used in various molding techniques such as TOM, IM, and extrusion method, and can be particularly preferably used in TOM.

The material used for the substrate component is not particularly limited and is not limited to the following, and examples thereof include polypropylene, polycarbonate, acrylonitrile-butadiene-styrene copolymer, and mixtures thereof. The substrate component can have various planar and / or three-dimensional shapes. Further, it is desirable that the substrate component easily transmits light.

The maximum area elongation of the decorative film after molding is generally about 50% or more, about 100% or more, or about 150% or more, about 500% or less, about 400% or less, or about 300% or less. The area elongation rate is the area elongation rate (%) = (BA) / A (A: the area before molding of a part of the decorative film, B: the area of the part corresponding to A of the decorative film after molding. ). For example, if the area of a part of the decorative film is 100 cm ² before molding and the area is 250 cm ² on the surface of the article after molding, it is 150%. The maximum area elongation rate refers to the value of the portion having the highest area elongation rate in all the decorative films on the surface of the molded product. When a flat film is attached to an article having a three-dimensional shape by TOM, for example, the portion where the film first hits the substrate component is hardly stretched and the area elongation rate is almost 0%, and the end portion to be attached last is large. It may be stretched and the area elongation rate may be 200% or more. In this way, the area growth rate may vary greatly depending on the location. The success or failure of molding is determined by whether or not defects such as non-following of the substrate parts and tearing of the film occur with respect to the portion where the film is most stretched. Therefore, not the average area elongation rate of the entire molded product, but the area elongation rate of the most stretched portion, that is, the maximum area elongation rate is a substantial index of the pass / fail of the molded product. For the maximum area elongation rate, for example, 1 mm square squares are printed on the entire surface of the decorative film before molding, and the area change is measured after molding, or the thickness of the decorative film before and after molding is measured. It can be confirmed by measuring.

<< Examples 1 to 13 and Comparative Example 1 >>
The following examples exemplify specific embodiments of the present disclosure, but the present invention is not limited thereto. All parts and percentages are by mass unless otherwise stated.

The products and the like used in this embodiment are shown in Table 1 below.

The materials shown in Table 1 were mixed at the blending ratios shown in Table 2 to prepare a coating liquid for producing a decorative layer and an adhesive layer, respectively. Here, as the acrylic pressure-sensitive adhesive in the coating liquid for the adhesive layer, a pressure-sensitive adhesive adjusted to have an acrylic resin theoretical refractive index of about 1.49 was used. All the values in Table 2 mean mass%.

<Example 1>
A polyester resin release liner was coated with the coating liquid G-3 for a decorative layer, and then heated at 110 ° C. for 5 minutes to be dried to form a laminate A having a decorative layer having a thickness of about 6 μm. Next, the decorative layer of the laminated body A and a multilayer extruded film having a thickness of about 105 μm (hereinafter, may be simply referred to as “protective layer”) composed of PMMA and PVDF as protective layers are laminated at 120 ° C. The laminated body B was formed. After removing the release liner of the laminate B, the decorative layer of the laminate B and the polyurethane film having a thickness of 20 μm as the support layer (hereinafter, may be simply referred to as “support layer”) are laminated at 120 ° C. To form the laminated body C. Next, the adhesive layer coating liquid T-4 was coated on another polyester resin release liner using a knife coater, and then heated at 120 ° C. for 10 minutes to dry, and the adhesive layer having a thickness of about 40 μm was obtained. The laminated body D including the above was formed. The support layer of the laminated body C and the adhesive layer of the laminated body D were laminated at 50 ° C. to form a decorative film.

<Example 2>
The same as in Example 1 except that the coating liquid for the decorative layer was changed to G-1, the thickness of the decorative layer was changed to about 8 μm, and the coating liquid for the adhesive layer was changed to T-3. , The decorative film of Example 2 was produced.

<Example 3>
The decorative film of Example 3 was produced in the same manner as in Example 1 except that the coating liquid for the decorative layer was changed to G-2 and the thickness of the decorative layer was changed to about 8 μm.

<Example 4>
The decorative film of Example 4 was produced in the same manner as in Example 1 except that the thickness of the decorative layer was changed to about 8 μm and the coating liquid for the adhesive layer was changed to T-2.

<Example 5>
The decorative film of Example 5 was produced in the same manner as in Example 1 except that the coating liquid for the decorative layer was changed to G-1 and the thickness of the decorative layer was changed to about 10 μm.

<Example 6>
The same as in Example 1 except that the coating liquid for the decorative layer was changed to G-2, the thickness of the decorative layer was changed to about 10 μm, and the coating liquid for the adhesive layer was changed to T-2. , The decorative film of Example 6 was produced.

<Example 7>
The decorative film of Example 7 was produced in the same manner as in Example 1 except that the thickness of the decorative layer was changed to about 10 μm and the coating liquid for the adhesive layer was changed to T-3.

<Example 8>
The decorative film of Example 8 was produced in the same manner as in Example 1 except that the thickness of the decorative layer was changed to about 10 μm.

<Example 9>
The same as in Example 1 except that the coating liquid for the decorative layer was changed to G-0, the thickness of the decorative layer was changed to about 8 μm, and the coating liquid for the adhesive layer was changed to T-5. , The decorative film of Example 9 was produced.

<Example 10>
The same as in Example 1 except that the coating liquid for the decorative layer was changed to G-0, the thickness of the decorative layer was changed to about 8 μm, and the coating liquid for the adhesive layer was changed to T-6. , The decorative film of Example 10 was produced.

<Example 11>
The coating liquid for the decorative layer was changed to G-0, the thickness of the decorative layer was changed to about 8 μm, a support layer having a tin vapor deposition layer with a thickness of 300 to 700 nm corresponding to the bright layer was adopted, and adhesion was achieved. The decorative film of Example 11 was produced in the same manner as in Example 1 except that the layer coating liquid was changed to T-6.

<Example 12>
The same as in Example 1 except that the coating liquid for the decorative layer was changed to G-0, the thickness of the decorative layer was changed to about 8 μm, and the coating liquid for the adhesive layer was changed to T-7. , The decorative film of Example 12 was produced.

<Example 13>
The coating liquid for the decorative layer was changed to G-0, the thickness of the decorative layer was changed to about 8 μm, the coating liquid for the adhesive layer was changed to T-7, and the thickness of the adhesive layer was changed to about 60 μm. The decorative film of Example 13 was produced in the same manner as in Example 1 except that it was changed.

<Comparative Example 1>
The same as in Example 1 except that the coating liquid for the decorative layer was changed to G-0, the thickness of the decorative layer was changed to about 8 μm, and the coating liquid for the adhesive layer was changed to T-1. , The decorative film of Comparative Example 1 was produced.

<Evaluation test>
The characteristics of each decorative film were evaluated using the following methods.

(Viewing angle brightness test)
A sample of the decorative film is placed between the "EZ Contrast" manufactured by ELDIM, which is a camera for measuring brightness, and the light projection unit of "Camcorder Projector CP45R" manufactured by 3M, which is a small projector, on the main surface of the decorative film. Is perpendicular to the light projection unit, and the distance between the light projection unit and the decorative film is about 32 cm. The results regarding the obtained 7/10 value angle, 9/10 value angle, and the brightness value at each viewing angle are shown in Table 3 and FIGS. 3 to 10. Here, FIG. 5 corresponds to the configuration of Comparative Example 1, and FIGS. 6 to 10 correspond to Examples 8 to 10 and Examples 12 and 13. As for the results of light diffusivity in Table 3, from the graphs of FIGS. 5 to 10, it is "impossible" that the peak of the hot spot (peak based on the maximum brightness) can be clearly confirmed, and the peak of the hot spot is slightly confirmed. Those that gained were judged as "OK", and those for which no hotspot peak could be confirmed were judged as "Good".

<result>
As can be seen from FIG. 3, when the total amount of light diffusing particles per unit area in the decorative layer and the adhesive layer is about 2.0 g / m ² or more, the 7/10 value angle is about 20 degrees or more. There was a tendency to become. As can be seen from FIG. 5, the decorative film of Comparative Example 1 having a 7/10 value angle of less than 20 degrees had a poor effect of improving hot spots. On the other hand, it was found that the decorative films of Examples 1 to 13 having a 7/10 value angle of about 20 degrees or more can significantly reduce hot spots, as can be seen from FIGS. 6 to 10.

As can be seen from FIG. 4, when the total amount of light diffusing particles per unit area in the decorative layer and the adhesive layer is about 3.0 g / m ² or more, the 9/10 value angle is about 30 degrees or more. There was a tendency to become. The decorative films of Examples 8 and 10 to 13 having a 9/10 value angle of about 30 degrees or more have a 7/10 value angle of about 20 degrees or more, as can be seen by comparing FIGS. 6 to 10. It was confirmed that the hot spots could be further reduced as compared with the decorative film of Example 9 (FIG. 7) having a 9/10 value angle of less than about 30 degrees.

It will be apparent to those skilled in the art that the above embodiments and examples can be variously modified without departing from the basic principles of the present invention. It is also apparent to those skilled in the art that various improvements and modifications of the present invention can be carried out without departing from the spirit and scope of the present invention.

100, 200 Thermally stretchable decorative film for light projection 110, 210 Protective layer 120, 220 Decorative layer 150, 250 Adhesive layer 230 Bright layer 240 Support layer
A part of the embodiment of the present disclosure is described in the following [Item 1]-[Item 11].
[Item 1]
A heat-stretchable decorative film for light projection, which comprises a decorative layer and an adhesive layer.
At least one of the decorative and adhesive layers contains light diffusible particles and contains.
A heat-stretchable decorative film for light projection, wherein the total amount of the light-diffusing particles per unit area in the decorative layer and the adhesive layer is 2.0 g / m ² or more.
[Item 2]
The heat-stretchable decorative film for light projection according to item 1, wherein the 7/10 value angle of the brightness is 20 degrees or more.
[Item 3]
The heat-stretchable decorative film for light projection according to item 1 or 2, wherein the 9/10 value angle of brightness is 30 degrees or more.
[Item 4]
The thermal stretchability for light projection according to any one of items 1 to 3, wherein the light diffusing particles do not contain the particles and have a difference from the refractive index of the decorative layer or the adhesive layer of 0.05 or more. Decorative film.
[Item 5]
The heat-stretchable decorative film for light projection according to any one of items 1 to 4, wherein the light-diffusing particles have an average particle diameter of 0.1 to 5.0 μm.
[Item 6]
The heat-stretchable decorative film for light projection according to any one of items 1 to 5, wherein the light-diffusing particles contain at least one of styrene particles and titanium oxide particles.
[Item 7]
Item 1. The heat-stretchable decorative film for light projection described.
[Item 8]
The heat-stretchable decorative film for light projection according to any one of items 1 to 7, which is used for rear projection.
[Item 9]
The heat-stretchable decorative film for light projection according to any one of items 1 to 8, which is used for automobiles.
[Item 10]
An article in which the heat-stretchable decorative film for light projection according to any one of items 1 to 9 is attached to a substrate component.
[Item 11]
A step of preparing the heat-stretchable decorative film for light projection according to any one of items 1 to 9 and a substrate component, and
A method for manufacturing an article, comprising a step of applying the decorative film to the surface of the substrate component by a three-dimensional coating molding method to form an article in which the decorative film is attached to the surface of the substrate component.

Claims (9)

A heat-stretchable decorative film for light projection, which comprises a decorative layer and an adhesive layer.
At least one of the decorative and adhesive layers contains light diffusible particles and contains.
The total amount of the light diffusing particles per unit area in the decorative layer and the adhesive layer is 2.0 g / m ² or more .
The 7/10 value angle of brightness is 20 degrees or more, or
The 9/10 value angle of brightness is 30 degrees or more, or
A heat-stretchable decorative film for light projection having a 7/10 value angle of brightness of 20 degrees or more and a 9/10 value angle of brightness of 30 degrees or more . The heat-stretchable decorative film for light projection according to claim 1, wherein the light-diffusing particles do not contain the particles and the difference from the refractive index of the decorative layer or the adhesive layer is 0.05 or more. The heat-stretchable decorative film for light projection according to claim 1 or 2 , wherein the light-diffusing particles have an average particle diameter of 0.1 to 5.0 μm. The heat-stretchable decorative film for light projection according to any one of claims 1 to 3 , wherein the light-diffusing particles contain at least one of styrene particles and titanium oxide particles. Any one of claims 1 to 4 , further comprising a protective layer above or above the decorative layer and / or further including a bright layer or a support layer comprising a bright layer between the decorative layer and the adhesive layer. The heat-stretchable decorative film for light projection according to the above. The heat-stretchable decorative film for light projection according to any one of claims 1 to 5 , which is used for rear projection. The heat-stretchable decorative film for light projection according to any one of claims 1 to 6 , which is used for automobiles. An article in which the heat-stretchable decorative film for light projection according to any one of claims 1 to 7 is attached to a substrate component. The step of preparing the heat-stretchable decorative film for light projection according to any one of claims 1 to 7 and the substrate component, and applying the decorative film to the surface of the substrate component by a three-dimensional coating molding method. A method for manufacturing an article, comprising a step of forming the article in which the decorative film is attached to the surface of the substrate component.

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