EP3706995A1 - Film décoratif de transmission de lumière, article moulé contenant un film décoratif de transmission de lumière, procédé de production associé et dispositif d'affichage d'éclairage - Google Patents

Film décoratif de transmission de lumière, article moulé contenant un film décoratif de transmission de lumière, procédé de production associé et dispositif d'affichage d'éclairage

Info

Publication number
EP3706995A1
EP3706995A1 EP18811919.2A EP18811919A EP3706995A1 EP 3706995 A1 EP3706995 A1 EP 3706995A1 EP 18811919 A EP18811919 A EP 18811919A EP 3706995 A1 EP3706995 A1 EP 3706995A1
Authority
EP
European Patent Office
Prior art keywords
layer
light
decorative film
transmissive decorative
design
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18811919.2A
Other languages
German (de)
English (en)
Inventor
Norihito Shibahara
Ayako KUSUMOTO
Rie Sakai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
3M Innovative Properties Co
Original Assignee
3M Innovative Properties Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 3M Innovative Properties Co filed Critical 3M Innovative Properties Co
Priority claimed from PCT/IB2018/058680 external-priority patent/WO2019092582A1/fr
Publication of EP3706995A1 publication Critical patent/EP3706995A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/14—Layered products comprising a layer of natural or synthetic rubber comprising synthetic rubber copolymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/263—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer having non-uniform thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/20—Inorganic coating
    • B32B2255/205—Metallic coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B32B2264/105—Metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/402—Coloured
    • B32B2307/4026—Coloured within the layer by addition of a colorant, e.g. pigments, dyes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/414—Translucent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/416—Reflective
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2451/00—Decorative or ornamental articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2551/00—Optical elements

Definitions

  • the present disclosure relates to a light-transmissive decorative film, a molded article containing a light-transmissive decorative film, a production method thereof, and a lighting display device.
  • Decorative films of diverse designs are used across a wide range of fields of interior materials of automobiles and the like.
  • a decorative film has been proposed in which a pattern of a light-transmissive part is visible when illuminated with a light source from behind, but in a state not illuminated by a light source from behind, the pattern of the light-transmissive part blends in with a surrounding light-blocking part and becomes invisible.
  • JP 2001-347539 A describes "a back-lightable decorative molded article in which an insert film or a transfer layer is formed integrally with a light-transmissive molded article surface and has at least one light-transmissive part and a light-blocking part adjacent to the
  • the decorative molded article being formed by successively laminating, on the light-transmissive molded article surface from a viewing side, a light-blocking layer formed on only the light-blocking part and a colored light-transmissive layer formed on at least the light-transmissive part in a region in the vicinity of at least one light-transmissive part; wherein the following relational formulas ( 1) to (3) hold for a color difference ⁇ when the chromaticity of the light-transmissive part and the light-blocking part in the region is measured from the viewing side using the CIE (International Commission on Illumination) 1976 L*a*b color system as well as the value Xi (%) of the light transmittance of all layers including the molded article positioned on the light-transmissive part in the region and the maximum value X2 (%) of the light transmittance of all layers including the molded article positioned on the light-blocking part in the region measured with JIS K 7105; and relational formula (4) additionally holds when there is a color difference ⁇ when
  • a decorative film capable of providing a highly designable appearance which changes when placed in an environment in which light such as daylight is incident on the decorative film surface without the film being illuminated with a light source from behind and when placed in a dark location and illuminated with a light source from behind.
  • the decorative film is preferably able to conform to the curved face well without any loss in design.
  • the present disclosure provides a decorative film which can provide a design that changes due to light in the ambient environment and light from a light source disposed behind the decorative film, and can be used in a molding method of covering an article having a three-dimensional shape by heat-stretching (called a "three-dimensional heat-stretching molding method” hereafter).
  • One embodiment of the present disclosure provides a light-transmissive decorative film capable of covering an article having a three-dimensional shape by heat-stretching, the light-transmissive decorative film including an upper design layer having optical transparency, a reflective layer, and a lower design layer having optical transparency in this order, wherein an OD value of the reflective layer is from 0.7 to 1.7.
  • Another embodiment of the present disclosure provides a molded article including a substrate and the light-transmissive decorative film configured to cover the substrate.
  • Yet another embodiment of the present disclosure provides a production method for a molded article including: preparing the light-transmissive decorative film described above and a substrate and applying the light-transmissive decorative film to a surface of the substrate by a three-dimensional heat-stretching molding method to form a molded article in which the substrate is covered with the light-transmissive decorative film.
  • Yet another embodiment of the present disclosure provides a lighting display device including the molded article described above and a light source disposed on the lower design layer side when seen from the reflective layer of the light-transmissive decorative film described above.
  • the present disclosure provides a decorative film which can provide a design that changes due to light in the ambient environment and light from a light source disposed behind the decorative film, and can be suitably used in a three-dimensional heat-stretching molding method.
  • FIG. 1 is a schematic cross-sectional view of a light-transmissive decorative film according to an embodiment of the present disclosure.
  • FIG. 2A is a schematic cross-sectional view of a molded article and lighting display device to which a light-transmissive decorative film according to an embodiment of the present disclosure is attached, illustrating a view when observed in a state in which a light source is off.
  • FIG. 2B is a schematic cross-sectional view of a molded article and lighting display device to which a light-transmissive decorative film according to an embodiment of the present disclosure is attached, illustrating a view when observed in a state in which a light source is on.
  • FIG. 3 is a cross-sectional view of a light-transmissive decorative film according to another embodiment of the present disclosure.
  • FIG. 4A is a schematic cross-sectional view of a molded article and lighting display device to which a light-transmissive decorative film according to another embodiment of the present disclosure is attached, illustrating a view when observed in a state in which a light source is off.
  • FIG. 4B is a schematic cross-sectional view of a molded article and lighting display device to which a light-transmissive decorative film according to another embodiment of the present disclosure is attached, illustrating a view when observed in a state in which a light source is off.
  • FIG. 5 A is a photograph illustrating the appearance of a molded article to which the light-transmissive decorative film of Example 2 is attached in daylight.
  • FIG. 5B is a photograph illustrating the appearance of a molded article to which the light-transmissive decorative film of Example 2 is attached when irradiated with light from behind.
  • film encompasses articles referred to as "sheets”.
  • the term "storage modulus” is the storage modulus E' when viscoelasticity measurement is performed in tension mode at a frequency of 10 Hz using a dynamic viscoelastic analyzer.
  • (meth)acrylic means “acrylic or methacrylic
  • (meth)acrylate means “acrylate or methacrylate”.
  • total light transmittance refers to the maximum total light transmittance measured in portions where the light-transmissive decorative film functions effectively in each component - that is, the maximum total light transmittance measured in regions including a first design and/or a second design.
  • the total light transmittance of a light-transmissive decorative film or the total light transmittance of a molded article to which a light-transmissive decorative film is attached refers to the maximum value measured in regions including a first design and/or a second design.
  • the total light transmittance of only the upper design layer and the reflective layer refers to the maximum value measured in a region including a first design.
  • the wavelength range in the visible range is not particularly limited, but the "total light transmittance in the visible range" refers to the total light transmittance at 400 nm to 700 nm.
  • the three-dimensional heat-stretching molding method includes a "three-dimensional overlay method" (TOM).
  • TOM three-dimensional overlay method
  • three-dimensional overlay method refers to a molding method including a process of preparing a film and a three-dimensional article; a process of disposing the film and the article in a vacuum chamber having in the interior thereof a heating device, wherein the film separates the interior space of the vacuum chamber into two and the article is disposed in one of the separated interior spaces; a process of heating the film by the heating device; a process of putting both the interior space in which the article is disposed and the interior space on the opposite side thereof in a vacuum atmosphere; and a process of making the article and the film contact with each other to cover the article with the film while putting the interior space in which the article is disposed in a vacuum atmosphere and putting the interior space on the opposite side thereof in a pressurized atmosphere or normal -pressure atmosphere.
  • the light-transmissive decorative film according to an embodiment of the present disclosure includes an upper design layer having optical transparency, a reflective layer, and a lower design layer having optical transparency in this order, wherein the OD value of the reflective layer is from approximately 0.7 to approximately 1.7.
  • the light-transmissive decorative film can be suitably used in a three-dimensional heat-stretching molding method such as insert molding or TOM.
  • FIG. 1 illustrates a cross-sectional view of a light-transmissive decorative film 10 according to an embodiment of the present disclosure.
  • the decorative film 10 includes, in this order, an upper design layer 12 having optical transparency, a reflective layer 14, and a lower design layer 16 having optical transparency.
  • the decorative film 10 may further include, as optional components, additional layers such as a bonding layer for bonding the layers forming the decorative film together, a primer layer, a release liner, an adhesive layer for attaching the decorative film to a substrate, and the like.
  • an adhesive layer 18 is illustrated as an optional component.
  • the upper design layer 12 includes a first resin layer 122 and a surface layer 124
  • the lower design layer 16 includes a second resin layer 162 and a pattern layer 164.
  • FIG. 2A is a schematic cross-sectional view of a molded article 20 in which the light-transmissive decorative film 10 is attached to a substrate 22, and a lighting display device including the molded article 20 and a light source 32.
  • the light source 32 is off, and light incident from the upper side of the light-transmissive decorative film 10 in daylight is reflected by the reflective layer 14 so that a design (first design) produced by the upper design layer 12 is visible to an observer.
  • FIG. 2B is a schematic cross-sectional view of a molded article 20 and a lighting display device 30 with the same configuration as in FIG. 2A, wherein the light source 32 is on.
  • the vicinity of the lighting display device is dark, the amount of light incident on the upper surface of the light-transmissive decorative film 10 is small, and the amount of light incident on the lower surface of the light-transmissive decorative film 10 from the light source 32 is large.
  • the reflective layer 14 has an OD value of from approximately 0.7 to approximately 1.7 and is designed so as to reflect light incident from the upper surface of the light-transmissive decorative film 10 in daylight and to transmit at least a portion of light incident from the lower surface of the light-transmissive decorative film 10. In this way, it is possible to provide a highly designable appearance of two types that change when the light-transmissive decorative film is placed in daylight without being illuminated by a light source from behind and when placed in a dark environment and illuminated with a light source from behind.
  • the reflective layer 14 is illustrated as a layer having a substantially smooth surface, but the reflective layer 14 may have an uneven surface.
  • an appearance with a visual effect abounding in change in daylight, in particular, can be obtained.
  • a schematic cross-sectional view of the light-transmissive decorative film of this embodiment is illustrated in FIG. 3, wherein the reflective layer 14 is illustrated as a layer having an uneven surface.
  • the upper design layer and the lower have optical transparency.
  • These design layers may include optically transparent regions and may include one or a plurality of non-optically transparent regions.
  • the entire upper design layer is translucent or transparent.
  • the total light transmittance in the visible range of the upper design layer is not less than approximately 1%, not less than approximately 2%, or not less than approximately 3% and not greater than approximately 70%, not greater than approximately 60%, or not greater than approximately 50%.
  • the total light transmittance is determined in accordance with JIS K 736-1 : 1997 (ISO 13468-1 : 1996). As a result of the total light transmittance of the upper design layer being within the range described above, the visibility of the second design when illuminated by a light source from behind can be increased.
  • the total light transmittance in the visible range of the combination of the upper design layer and the reflective layer is not less than approximately 0.01%, not less than approximately 0.02%, or not less than approximately 0.05% and not greater than approximately 12%, not greater than approximately 10%, or not greater than approximately 8%.
  • the total light transmittance of the combination of the upper design layer and the reflective layer being within the range described above, the visibility of the second design in daylight can be effectively reduced, and the visibility of the second design when illuminated by a light source from behind can be maintained.
  • the total light transmittance in the visible range of the lower design layer is not less than approximately 1%, not less than approximately 2%, or not less than approximately 3% and not greater than approximately 70%, not greater than approximately 60%, or not greater than approximately 50%.
  • the clarity of the second design when illuminated by a light source from behind can be increased.
  • Examples of the upper and lower design layers include a color layer that exhibits a paint color or the like, a pattern layer that expresses a logo, an image, or a pattern such as a wood grain pattern, stone grain pattern, geometric pattern or leather pattern, a relief (embossed pattern) layer in which recesses and protrusions are provided on the surface, and layers including combinations thereof.
  • the upper design layer includes a transparent color layer, and the total light transmittance of the upper design layer is not less than approximately 5%, not less than approximately 90%, or not less than approximately 95%.
  • a layer having a pattern, logo, design, or the like formed by printing such as gravure direct printing, gravure offset printing, inkjet printing, laser printing or screen printing, coating such as gravure coating, roll coating, die coating, bar coating or knife coating, punching, or etching may be used.
  • the pattern layer may be supported by the resin layer.
  • resins such as acrylic resins that include polymethyl methacrylate (PMMA), polyurethane, polyvinyl chloride, polycarbonate, acrylonitrile/butadiene/styrene copolymer (ABS), polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate (PET) and polyethylene naphthalate, and copolymers such as ethylene/acrylic acid copolymer, ethylene/ethyl acrylate copolymer, and ethylene/vinyl acetate copolymer, or mixtures thereof, for example, can be used as the transparent resin layer.
  • PMMA polymethyl methacrylate
  • ABS acrylonitrile/butadiene/styrene copolymer
  • PET polyethylene terephthalate
  • copolymers such as ethylene/acrylic acid copolymer, ethylene/ethyl acrylate copolymer,
  • the resin layer may be provided in the form of a film, a sheet, or the like.
  • the pattern layer may include a plurality of regions of different colors and/or light transmittance.
  • the lower design layer 16 includes a pattern layer 164 supported on the second resin layer 162, and the pattern layer 164 is illustrated as a layer that has a different color and light transmittance depending on the location. For example, as illustrated in FIG. 2B, light from the light source 32 is transmitted in regions where the pattern layer 164 is present (white regions), while a portion of light is transmitted in other regions (regions with diagonal lines), and light is not transmitted in other regions (black regions).
  • a thermoplastic resin resin layer having a concavo-convex form on the surface obtained by a conventionally known method such as embossing, scratching, laser processing, dry etching, hot pressing, or the like may be used.
  • the relief layer can be formed by coating a heat-curable or radiation-curable resin such as curable (meth)acrylic resin on a release film having a concavo-convex form, curing it by heat or radiation, and removing the release film.
  • thermoplastic resin, heat-curable resin and radiation-curable resin used in the relief layer are not particularly limited, but fluorine resins, polyesters such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), (meth)acrylic resins, a polyolefins such as polyethylene and polypropylene, thermoplastic elastomers, polycarbonates, polyamides,
  • ABS acrylonitrile-butadiene-styrene copolymers
  • ABS acrylonitrile-styrene copolymers
  • polystyrenes polystyrenes
  • polyvinyl chlorides polyurethanes, and the like
  • the upper design layer includes a color layer
  • the lower design layer includes a pattern layer.
  • the film exhibits an appearance with a uniform color (first design) in an environment in which light is incident from the upper surface of the light-transmissive decorative film in daylight or the like, and a combination of the color of the upper design layer and the pattern of the lower design layer (second design) is visible when light is made incident from the lower surface of the light-transmissive decorative film using a light source or the like in a state in which the vicinity is dark.
  • both the upper design layer and the lower design layer include pattern layers.
  • the pattern of the upper design layer (first design) is visible in an environment in which light is incident from the upper surface of the light-transmissive decorative film in daylight or the like, and a combination of the pattern of the upper design layer and the pattern of the lower design layer (second design) is visible when light is made incident from the lower surface of the light-transmissive decorative film using a light source or the like in a state in which the vicinity is dark.
  • the upper design layer may include a surface layer disposed on the uppermost surface of the light-transmissive decorative film.
  • the surface layer may have a substantially smooth surface, or may have a concavo-convex surface such as an embossed pattern on the surface.
  • a variety of resins such as (meth)acrylic resins including polymethyl methacrylate (PMMA), polyurethane, fluorine resins such as ethylene/tetrafluoroethylene copolymers (ETFE), polyvinylidene fluoride (PVDF), and methyl methacrylate/vinylidene fluoride copolymers (PMMA/PVDF), silicone copolymers, polyolefins such as polyvinyl chlorides, polycarbonates, acrylonitrile-butadiene-styrene copolymers (ABS), polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), copolymers such as ethylene-acrylic acid copolymers, ethylene -ethyl acrylate copolymers, and ethylene -vinyl acetate copolymers, or mixtures thereof, for example, can be
  • (meth)acrylic resins, polyurethanes, polyvinyl chlorides, polyethylene terephthalate, acrylonitrile/butadiene/styrene copolymers and polycarbonates can be advantageously used as the surface layer.
  • the surface layer may function as a protective layer for protecting other layers forming the light-transmissive decorative film from puncture, impact, or the like from the outside.
  • the surface layer may be a multilayer laminate such as a multilayer extruded laminate, for example.
  • the surface layer may include, as necessary, ultraviolet absorbers such as benzotriazole, Tinuvin (trademark) 400 (manufactured by BASF), and the like, and hindered amine light stabilizers (HALS) such as Tinuvin (trade name) 292 (manufactured by BASF), and the like.
  • ultraviolet absorbers such as benzotriazole, Tinuvin (trademark) 400 (manufactured by BASF), and the like
  • HALS hindered amine light stabilizers
  • the surface layer may include hard coating material, a luster giving agent, and the like, and may also have an additional hard coating layer.
  • the entire surface layer is typically transparent, but in order to provide an intended appearance, all or a portion of the outermost layer may be translucent, and a portion of the protective layer may be opaque.
  • the total light transmittance in the visible range of the surface layer is not less than approximately 85%, not less than approximately 90%, or not less than approximately 95%.
  • a resin layer that can be used in the upper design layer or the lower design layer may be adhesive.
  • the reflective layer or the like can be directly laminated on such as resin layer without interposing a bonding layer.
  • the second resin layer included in the lower design layer is adhesive, the light-transmissive decorative film can be adhered to the substrate without separately providing an adhesive layer.
  • An adhesive resin layer may be formed by adding a tackifier to the resin material described above, for example, or may be formed from the same material as the adhesive layer described below.
  • the first resin layer included in the upper design layer may have a translucent metallic layer with a total transmittance in the visible range of not less than approximately 10% and not greater than approximately 70%, for example, inside the first resin layer.
  • the translucent metallic layer may be a metal thin film containing a metal selected from aluminum, nickel, gold, platinum, chromium, iron, copper, tin, indium, silver, titanium, lead, zinc, germanium, and the like formed by vacuum deposition, sputtering, ion plating, plating, or the like, or may be a brightening (metallic) resin layer in which brightening (metallic) pigments such as aluminum brightening material, such as aluminum flakes, vapor-deposited aluminum flakes, metal oxide-coated aluminum flakes, or colored aluminum flakes, or pearl brightening material, such as flake or synthetic mica covered with a metal oxide such as titanium oxide, or iron oxide, are dispersed in a binder resin such as acrylic resin, or polyurethane resin.
  • a binder resin such as acrylic resin, or polyurethane resin.
  • the upper design layer and the lower design layer may have a variety of thicknesses, but the thickness is typically not less than approximately 0.1 ⁇ , not less than approximately 1 ⁇ , or not less than approximately 3 ⁇ and not greater than approximately 300 ⁇ , not greater than approximately 200 ⁇ , or not greater than approximately 100 ⁇ .
  • the thickness of the surface layer may typically be not less than approximately 1 ⁇ , not less than approximately 5 ⁇ , or not less than approximately 10 ⁇ and not greater than approximately 200 ⁇ , not greater than approximately 100 ⁇ , or not greater than approximately 80 ⁇ .
  • a thinner surface layer is advantageous from the perspective of conformity to the shape of the substrate, and a thickness of not greater than approximately 100 ⁇ or not greater than approximately 80 ⁇ , for example, is preferable.
  • a thicker surface layer is advantageous, and a thickness of not less than approximately 5 ⁇ or not less than approximately 10 ⁇ , for example, is preferable.
  • the reflective layer may be a metal thin film containing a metal selected from aluminum, nickel, gold, platinum, chromium, iron, copper, tin, indium, silver, titanium, lead, zinc, germanium, or the like, or alloys or compounds of the same, formed by vacuum deposition, sputtering, ion plating, plating or the like.
  • the reflective layer is a vapor-deposited layer containing tin, indium, or a combination thereof.
  • the stability of the metal forming the reflective layer is high, and deterioration such as corrosion or discoloration is unlikely to occur even when oxidized, so the reflection performance of the reflective layer can be maintained over a long period of time.
  • the reflective layer may be a resin layer in which brightening pigments such as aluminum brightening material, such as aluminum flakes, vapor-deposited aluminum flakes, metal oxide-coated aluminum flakes, or colored aluminum flakes, or pearl brightening material, such as flake or synthetic mica covered with a metal oxide such as titanium oxide, or iron oxide, are dispersed in a binder resin such as a (meth)acrylic resin or polyurethane.
  • the reflective layer may be a metal foil of aluminum, nickel, gold, silver, copper, or the like.
  • the reflective layer is a metal thin film or a metal foil
  • the resin layer may be the first resin layer of the upper design layer, the second resin layer of the lower design layer, or a third resin layer separate from these design layers.
  • the surface of the resin layer supporting the reflective layer may be a flat surface or may be an uneven surface.
  • the reflective layer itself that is formed thereon becomes uneven, which makes it possible to achieve complex light reflection and exhibit a visual effect abounding in change.
  • the light-transmissive decorative film 10 further includes a third resin layer 15, and the reflective layer 14 is supported on the surface of the third resin layer 15.
  • the third resin layer 15 may have an uneven surface, which causes the reflective layer 14 to also have an uneven surface.
  • the resin layer supporting the reflective layer contains at least one thermoplastic resin selected from the group consisting of vinyl chloride/vinyl acetate copolymers, polyurethanes, polyesters, (meth)acrylic resins, and phenoxy resins.
  • thermoplastic resin selected from the group consisting of vinyl chloride/vinyl acetate copolymers, polyurethanes, polyesters, (meth)acrylic resins, and phenoxy resins.
  • phenoxy resin means a thermoplastic polyhydroxy polyether synthesized using a bisphenol and epichlorohydrin, and encompasses those having an epoxy group derived from a tiny amount of epichlorohydrin in the molecule (for example, at the terminal).
  • the epoxy equivalent amount of phenoxy resin is higher than that of epoxy resin, for example, not less than 5,000, not less than 7,000 or not less than 10,000.
  • the resin layer supporting the reflective layer it is advantageous for the resin layer supporting the reflective layer to contain a phenoxy resin.
  • a resin layer containing a phenoxy resin has particularly excellent adhesion to a reflective layer containing a metal such as tin, indium or the like.
  • the resin layer supporting the reflective layer contains a phenoxy resin and a polyurethane - in particular, a polyester-based polyurethane with excellent miscibility with the phenoxy resin.
  • the OD (optical density) value of the reflective layer is not less than approximately 0.7 and not greater than approximately 1.7. In some embodiments, the OD value of the reflective layer is not less than approximately 0.8 or not less than approximately 0.9 and not greater than approximately 1.5 or not greater than approximately 1.3. By setting the OD value of the reflective layer to within the range described above, it is possible to reflect light incident from the upper surface of the light-transmissive decorative film in daylight and to transmit at least a portion of light incident from the lower surface of the light-transmissive decorative film.
  • the thickness of the reflective layer may differ depending on the material and a formation method of the reflective layer, even for the same OD value.
  • these films ordinarily form a sea-island structure and may have a continuous layer structure.
  • the light-transmissive decorative film may further include an adhesive layer disposed on the lower design layer side when viewed from the reflective layer of the light-transmissive decorative film.
  • adhesives such as solvent-type, emulsion-type, pressure-sensitive type, heat-sensitive type, and heat-curable or ultraviolet-curable type adhesives, including (meth)acrylics, polyolefins, polyurethanes, polyesters, rubbers, and the like can be used as the adhesive layer.
  • the thickness of the adhesive layer is typically not less than approximately 5 ⁇ , not less than approximately 10 ⁇ , or not less than approximately 20 ⁇ and not greater than approximately 200 ⁇ , not greater than approximately 100 ⁇ , or not greater than approximately 80 ⁇ .
  • any release liner can be used as the release layer for protecting the adhesive layer or the resin layer that is adhesive.
  • typical release liners include those prepared from paper (for example, kraft paper), and polymer materials (for example, polyolefins such as polyethylene and polypropylene, and ethylene vinyl acetate, polyurethane and polyesters such as polyethylene terephthalate and the like).
  • the release liner may be coated as necessary with a silicone-containing material or fluorocarbon-containing material.
  • the thickness of the release liner is typically not less than approximately 5 ⁇ , not less than approximately 15 ⁇ , or not less than approximately 25 ⁇ and not greater than approximately 300 ⁇ , not greater than approximately 200 ⁇ , or not greater than approximately 150 ⁇ .
  • Each layer forming the light-transmissive decorative film may be bonded using a bonding layer.
  • adhesives such as solvent-type, emulsion-type, pressure-sensitive type, heat-sensitive type, and heat-curable or ultraviolet-curable type adhesives, including acrylics, polyolefins, polyurethanes, polyesters, rubbers, and the like can be used as the bonding layer.
  • the thickness of the bonding layer is typically not less than approximately 0.05 ⁇ , not less than approximately 0.5 ⁇ , or not less than approximately 5 ⁇ , and not more than approximately 100 ⁇ , not more than approximately 50 ⁇ , or not more than approximately 20 ⁇ .
  • the adhesive layer and/or the bonding layer may contain coloring materials such as the same inorganic pigments and organic pigments as those described for the upper and lower design layers.
  • the storage modulus of one or a plurality of the resin layer and surface layer of the upper design layer, the resin layer of the lower design layer, and the resin layer forming the reflective layer or supporting the reflective layer may be not less than approximately 1 x 10 6 Pa, not less than approximately 1.5 ⁇ 10 6 Pa, or not less than approximately 2 ⁇ 10 6 Pa and not greater than approximately 1.5 ⁇ 10 8 Pa or not greater than approximately 1.3 ⁇ 10 8 Pa in the temperature range of from 110°C to 150°C when measured in the tension mode at a frequency of 10 Hz.
  • the storage modulus of the resin layer or the surface layer being within the range described above, the light-transmissive decorative film can be made to conform well to the three-dimensional curved face of the substrate. This makes it possible to prevent damage to the reflective layer and to maintain the quality of the first and second designs when stress, heat, or the like is applied to the light-transmissive decorative film or when the light-transmissive decorative film deforms.
  • a resin layer which has a storage modulus of not less than approximately 1 ⁇ 10 6 Pa, not less than approximately 1.5 ⁇ 10 6 Pa, or not less than approximately 2 x 10 6 Pa and not greater than approximately 1.5 ⁇ 10 8 Pa or not greater than approximately 1.3 ⁇ 10 8 Pa in the temperature range of from 1 10°C to 150°C when measured in the tension mode at a frequency of 10 Hz, to be disposed on both sides of the reflective layer.
  • the storage modulus of one or a plurality of the resin layer and surface layer of the upper design layer, the resin layer of the lower design layer, and the resin layer forming the reflective layer or supporting the reflective layer may be not less than approximately 1 ⁇ 10 5 Pa, not less than approximately 1.5 ⁇ 10 5 Pa, or not less than approximately 2 x 10 5 Pa and not greater than approximately 2 ⁇ 10 8 Pa, not greater than approximately 1.5 ⁇ 10 8 Pa, or not greater than approximately 1 ⁇ 10 8 Pa in the temperature range of from 1 15°C to 140°C when measured in the tension mode at a frequency of 10 Hz.
  • the light-transmissive decorative film can be made to conform well to the three-dimensional curved face of the substrate. This makes it possible to prevent damage to the reflective layer and to maintain the quality of the first and second designs when stress, heat, or the like is applied to the light-transmissive decorative film or when the light-transmissive decorative film deforms.
  • a resin layer which has a storage modulus of not less than approximately 1 ⁇ 10 5 Pa, not less than approximately 1.5 ⁇ 10 5 Pa, or not less than approximately 2 x 10 5 Pa and not greater than approximately 2 ⁇ 10 8 Pa, not greater than approximately 1.5 ⁇ 10 8 Pa, or not greater than approximately 1 ⁇ 10 8 Pa in the temperature range of from 1 15°C to 140°C when measured in the tension mode at a frequency of 10 Hz, to be disposed on both sides of the reflective layer.
  • the light-transmissive decorative film can be produced by appropriately combining conventionally known methods such as coating, heat lamination, transferring, printing, vapor deposition, and extrusion.
  • the following production method will be described hereinafter as an example, but the production method for a light-transmissive decorative film is not limited to this example.
  • a pattern layer constituting a lower design layer is formed by printing on a release liner such as a PET film, and a resin layer A is formed by coating on the pattern layer.
  • An adhesive layer formed by coating, extrusion, or the like on a separate release liner B is then laminated by heat lamination on the resin layer A to form a laminate 1 including a lower design layer.
  • a resin layer B is formed by coating on another release liner C such as a PET film, and a metal such as tin or indium is vapor-deposited on the resin layer B to form a reflective layer supported on the resin layer B.
  • Colored transparent resin layer C constituting an upper design layer is laminated by heat lamination on the reflective layer.
  • a resin layer serving as a surface layer of the upper design layer is then laminated by heat lamination on the transparent resin layer C, and the resin film surface is subjected to emboss finishing to form a laminate 2.
  • the release liner A of the laminate 1 and the release liner C of the laminate 2 are then removed, and a light-transmissive decorative film is formed by heat-laminating the laminates 1 and 2,such that the pattern layer included in the lower design layer of the laminate 1 and the resin layer B of the laminate 2 face one another.
  • the coating may include a drying and/or a curing process as necessary, and the co-extrusion method may be replaced with a single layer extrusion method, a multilayer extrusion method, or the like.
  • the thickness of the light-transmissive decorative film is not less than approximately 25 ⁇ , not less than approximately 50 ⁇ , or not less than approximately 100 ⁇ and not greater than approximately 2 mm, not greater than approximately 1 mm, or not greater than approximately 500 ⁇ .
  • the decorative film can be made to sufficiently conform to a substrate with a complex shape, and thus a structure with excellent appearance can be provided.
  • the storage modulus of the light-transmissive decorative film is not less than approximately 1 ⁇ 10 6 Pa, not less than approximately 1.5 ⁇ 10 6 Pa, or not less than approximately 2 ⁇ 10 6 Pa and not greater than approximately 1.5 ⁇ 10 8 Pa or not greater than approximately 1.3 ⁇ 10 8 Pa in the temperature range of from 1 10°C to 150°C when measured in the tension mode at a frequency of 10 Hz.
  • the "storage modulus of the light-transmissive decorative film" refers to a single value measured for the entire multilayer structure, which is a combination of the storage moduli of each individual layer constituting the light-transmissive decorative film.
  • the light-transmissive decorative film can be made to conform well to the three-dimensional curved face of the substrate. This makes it possible to prevent damage to the reflective layer and to maintain the quality of the first and second designs when stress, heat, or the like is applied to the light-transmissive decorative film or when the light-transmissive decorative film deforms.
  • the storage modulus of the light-transmissive decorative film is not less than approximately 1 ⁇ 10 5 Pa, not less than approximately 1.5 ⁇ 10 5 Pa, or not less than approximately 2 ⁇ 10 5 Pa and not greater than approximately 2 ⁇ 10 8 Pa, not greater than approximately 1.5 ⁇ 10 8 Pa, or not greater than approximately 1 ⁇ 10 8 Pa in the temperature range of from 1 15°C to 140°C when measured in the tension mode at a frequency of 10 Hz.
  • the storage modulus of the light-transmissive decorative film being within the range described above, the light-transmissive decorative film can be made to conform well to the
  • the total light transmittance in the visible range of the light-transmissive decorative film is not greater than approximately 3%, not greater than approximately 2.5%, or not greater than approximately 2% and not less than approximately 0.01 %, not less than approximately 0.025%, or not less than approximately 0.04%.
  • the total light transmittance of the light-transmissive decorative film being within the range described above, the visibility of the design provided by the lower design layer in daylight can be effectively reduced, and the visibility of the second design provided by a combination of the upper and lower design layers when illuminated by a light source from behind can be maintained.
  • the total light transmittance in the visible range of the light-transmissive decorative film is not greater than approximately 12%, not greater than approximately 10%, or not greater than approximately 8% and not less than approximately 0.01%, not less than approximately 0.05%, or not less than approximately 0.1%.
  • the total light transmittance of the light-transmissive decorative film being within the range described above, the visibility of the design provided by the lower design layer in daylight can be effectively reduced, and the visibility of the second design provided by a combination of the upper and lower design layers when illuminated by a light source with low power output, in particular, from behind can be maintained.
  • the scratch resistance of the light-transmissive decorative film can be evaluated in terms of pencil hardness in accordance with JIS K5600-5-4.
  • light-transmissive decorative film of one embodiment is 6B or greater when measured by fixing the light-transmissive decorative film on a glass plate and then scratching the surface at a rate of 600 mm/min.
  • the pencil hardness may be not below 5B, not below 4B, or not below 3B.
  • a molded article in which a substrate is covered by the light-transmissive decorative film is provided.
  • a molded article in which the substrate is covered with the light-transmissive decorative film can be formed.
  • injection molding, extrusion, or the like which does not require a high degree of conformity to the shape of the film shape in comparison to TOM, is used, a molded article in which the light-transmissive decorative film is attached to the substrate can be formed.
  • the substrate may contain various materials such as polyethylenes, polypropylenes, (meth)acrylic resins, polycarbonates, acrylonitrile -butadiene -styrene copolymers, blends thereof, or combinations thereof, for example.
  • the substrate may be an inorganic material having optical transparency such as glass.
  • the substrate may have various shapes such as a flat shape or a three-dimensional shape.
  • the substrate is translucent or transparent. It is advantageous for the substrate to be transparent - in particular, for the total light transmittance of the substrate in a wavelength range of from 400 to 700 nm to be not less than approximately 90% or not less than approximately 95% - as it allows the second design provided by the lower design layer to be clearly visible.
  • the substrate contains a polycarbonate with excellent strength and transparency.
  • the substrate may be a color layer that exhibits a paint color or the like, a pattern layer that expresses a logo, an image, or a pattern such as a wood grain pattern, stone grain pattern, geometric pattern or leather pattern, a relief (embossed pattern) layer in which an uneven shape is provided on the surface, or a combination thereof, or the substrate may contain such a layer.
  • a color layer may be a colored film attached to the substrate.
  • a first design produced by the upper design layer is visible in daylight
  • a second design produced by a combination of the upper design layer, the substrate, and the lower design layer is visible in the presence of light passing through the substrate, the lower design layer, the reflective layer, and the upper design layer in this order.
  • a molded article further including an adhesive layer disposed between the
  • the adhesive layer may be a layer forming the
  • An adhesive layer functioning as a color layer may contain colorants such as pigments such as inorganic pigments such as titanium oxide, carbon black, chrome yellow, yellow iron oxide, colcothar, or red iron oxide; organic pigments such as phthalocyanine pigments (phthalocyanine blue, phthalocyanine green, or the like), azo lake pigments, indigo pigments, perinone pigments, perylene pigments, quinophthalone pigments, dioxazine pigments, or quinacridone pigments such as quinacridone red.
  • colorants such as pigments such as inorganic pigments such as titanium oxide, carbon black, chrome yellow, yellow iron oxide, colcothar, or red iron oxide; organic pigments such as phthalocyanine pigments (phthalocyanine blue, phthalocyanine green, or the like), azo lake pigments, indigo pigments, perinone pigments, perylene pigments, quinophthalone pigments, dioxazine pigments, or quinacridone pigments such as quinacrid
  • the substrate has unevenness on the surface on the opposite side as the light-transmissive decorative film.
  • FIGS. 4 A and 4B Schematic cross-sectional views of a molded article and a lighting display device to which the light-transmissive decorative film of this embodiment is attached are illustrated in FIGS. 4 A and 4B.
  • FIG. 4A illustrates how the lighting display device looks when observed in a state in which the light source is off
  • FIG. 4B illustrates how the lighting display device looks in a state in which the light source is on.
  • FIG. 4A as in FIG.
  • the light source 32 is off, and light incident from the upper side of the light-transmissive decorative film 10 in daylight is reflected by the reflective layer 14 so that a design (first design) produced by the upper design layer 12 is visible to an observer.
  • the advancing direction changes when light from the light source 32 is incident on the uneven surface of the substrate 22, and the light then passes through the substrate 22, the adhesive layer 18, the lower design layer 16, the reflective layer 14, and the upper design layer 12.
  • a design (second design) produced by a combination of the upper design layer 12 and the lower design layer 16, a combination of the upper design layer 12, the substrate 22, and the lower design layer 16, and a combination of the upper design layer 12, the substrate 22, the adhesive layer 18, and the lower design layer 16 is visible to an observer in the presence of light passing through the substrate 22, the adhesive layer 18, the lower design layer 16, the reflective layer 14, and the upper design layer 12 in this order.
  • the total light transmittance in the visible range of the molded article is not greater than approximately 3%, not greater than approximately 2.5%, or not greater than approximately 2% and not less than approximately 0.01%, not less than approximately
  • the visibility of the design (second design) provided by the lower design layer and optionally the substrate and/or adhesive layer in daylight can be effectively reduced, and the visibility of the second design when illuminated by a light source from behind can be maintained.
  • the total light transmittance in the visible range of the molded article is not greater than approximately 12%, not greater than approximately 10%, or not greater than approximately 8% and not less than approximately 0.01%, not less than approximately 0.05%, or not less than approximately 0.1%.
  • the visibility of the design (second design) provided by the lower design layer and optionally the substrate and/or adhesive layer in daylight can be effectively reduced, and the visibility of the second design when illuminated by a light source with low power input, in particular, from behind can be maintained.
  • the maximum area stretching ratio of the light-transmissive decorative film after molding is generally not lower than approximately 50%, not lower than approximately 100%, or not lower than approximately 200% and not higher than approximately 1000%, not higher than
  • the maximum area stretching ratio refers to the value at the location of highest area stretching ratio in the light-transmissive decorative film on the entire article surface.
  • the portion of the film that first affixes to the substrate is stretched very little and has an area stretching ratio of nearly 0%.
  • the ends that are affixed last are stretched significantly and achieve an area stretching ratio of 200% or higher.
  • the area stretching ratio varies widely depending on location. Whether the molding process is acceptable or not is determined by the presence or absence of defects such as nonconformity to the substrate, tearing of the film, and the like in the portions of the film that are stretched the most. Accordingly, the area stretching ratio in the portion that was stretched the most, that is, the maximum area stretching ratio rather than the average area stretching ratio of the overall molded product becomes the substantial index for the acceptability of the molded product.
  • the maximum area stretching ratio is determined by, for example, printing 1-mm squares on the entire surface of the light-transmissive decorative film before molding and then measuring the change in the areas thereof after molding, or by measuring the thickness of the light-transmissive decorative film before and after molding.
  • One embodiment of the present disclosure provides a lighting display device including a molded article in which a substrate is covered by a light-transmissive decorative film, and a light source disposed on the lower design layer side from the perspective of the reflective layer of the light-transmissive decorative film.
  • Various light sources such as an LED, a fluorescent lamp, an incandescent lamp, or a halogen lamp may be used as a light source . It is advantageous for an LED, which has a high illuminance and small amount of heat radiation, to be used as the light source used in the lighting display device.
  • a diffusing plate or a diffusing film may be disposed between the molded article and the light source with the objective of reducing the visibility of the shape of the light source by diffusing the light from the light source.
  • the illuminance of the light source used in the lighting display device may be, for example, not less than approximately 0.5 lm/m 2 , not less than approximately 0.6 lm/m 2 , or not less than approximately 0.7 lm/m 2 and not greater than approximately 300 lm/m 2 , not greater than approximately 200 lm/m 2 , or not greater than approximately 100 lm/m 2 on a measurement surface positioned 15 cm vertically away from the light-emitting surface of the light source.
  • the illuminance in the present disclosure can be measured using an illuminance meter in accordance with JIS C 7801 :2014 "Methods of Measuring Light of Light Sources for General Lighting".
  • the illuminance of the lighting display device may be, for example, not less than approximately 0.5 lm/m 2 , not less than approximately 0.6 lm/m 2 , or not less than approximately 0.7 lm/m 2 and not greater than approximately 45 lm/m 2 , not greater than approximately 35 lm/m 2 , or not greater than approximately 30 lm/m 2 on a measurement surface positioned 15 cm vertically away from the center of the surface of the molded article.
  • the light-transmissive decorative film of the present disclosure may be suitably used in three-dimensional heat-stretching molding methods such as insert molding or TOM for the purpose of decoration of automobile parts, household appliances, railroad cars, and building materials, and it may be used particularly suitably in TOM.
  • the light-transmissive decorative film of the present disclosure may also be used in other molding methods such as, for example, various molding techniques such as injection molding or extrusion, or may be used by applying the light-transmissive decorative film to a flat substrate such as a plastic sheet or window glass.
  • a light-transmissive decorative film was produced in accordance with the following procedure.
  • a water-based polyurethane solution (Resamine (trade name) D6260 (called a "water-based urethane solution” hereinafter), Dainichiseika Color & Chemicals Mfg. Co., Ltd. (Chuo-ku, Tokyo, Japan)
  • PAT polyethylene terephthalate
  • a white acrylic adhesive layer with a thickness of 40 ⁇ was then formed on a liner prepared by forming a melamine mold release layer on a PET film (ACW200, 3M (St. Paul, Minnesota, USA), and after drying, this was heat-laminated at 50°C on the polyurethane layer to form a laminate 1.
  • a tin vapor-deposited layer having the respective OD value shown in Table 1 was formed on a polyurethane layer formed with a thickness of 20 ⁇ using a water-based urethane solution on another PET film with a thickness of 50 ⁇ subjected to mold release treatment, and a thin, pitch black printed layer formed on yet another PET film with a thickness of 50 ⁇ subjected to mold release treatment was heat-laminated at 50°C on the vapor-deposited layer.
  • the OD value was determined using a Gretag Macbeth D200-II concentration meter.
  • an acrylic film (Technolloy (Trademark) S014S, Escarbo Sheet (Mitsuke-shi, Niigata, Japan) with a thickness of 75 ⁇ was heat-laminated at 50°C.
  • the acrylic film surface was then subjected to emboss finishing using a heating cylinder having a hairline shape to form a laminate 2.
  • the PET film supporting the printed layer with a wood pattern of the laminate 1 was removed, and the polyurethane layer of the laminate was positioned so as to face the printed layer with a wood pattern of the laminate 1 and heat-laminated at 120°C to produce a light-transmissive decorative film.
  • the liner (ACW200) was removed from the light-transmissive decorative film, and this was pressure-bonded at 145°C with a vacuum/pressure forming method onto a polycarbonate substrate having a semi-cylindrical three-dimensionally curved face to produce a molded product to which the light-transmissive decorative film was attached.
  • the OD value of the tin vapor-deposited layer, the light transmittance (value calculated from OD value), the total light transmittance of the light-transmissive decorative film prior to molding, and the vacuum moldability of the light-transmissive decorative films of Examples 1 to 3 and Comparative Examples 1 and 2 are shown in Table 1.
  • the appearance when observed in daylight without being illuminated with light from the polycarbonate substrate side using an LED with a power output of 10 W (first design) and the appearance when illuminated with light in a dark room (second design) are also shown in Table 1.
  • An LED tape light product name: Minger LED tape light for car interior decoration, LED type 5050, output power: 10 W (2.5 W ⁇ 4 tapes), source: Shenzhen Minger E-commerce Co., Ltd.
  • the first design was considered good if the wood pattern design of the lower design layer was invisible and was considered poor if the wood pattern design was visible.
  • the second design was considered good if the wood pattern of the lower design layer was clearly visible and was considered poor if the wood pattern appeared blurry.
  • the first and second designs of the light-transmissive decorative film of Example 2 are respectively illustrated in photographs in FIGS. 5A and 5B.
  • the storage modulus of the polyurethane layer formed using the water-based urethane solution contained in the light-transmissive decorative film was within the range of from 6.2 ⁇ 10 6 Pa to 1.1 x 10 8 Pa in the temperature range of from HO to 150°C when measured in the tension mode at a frequency of 10 Hz using an ARES dynamic viscoelasticity measuring device
  • a light-transmissive decorative film was produced in accordance with the following procedure. Two indium vapor-deposited layers were formed in a superimposed manner on a polyurethane layer formed with a thickness of 20 ⁇ using a water-based urethane solution on another PET film with a thickness of 50 ⁇ subjected to mold release treatment. The OD value of the indium vapor-deposited layer determined using a Gretag Macbeth D200-II concentration meter was 0.7. The PET film supporting the polyurethane layer was removed, and a printed layer with a wood pattern (thickness: 3-4 ⁇ ) formed on another PET film with a thickness of 50 ⁇ subjected to mold release treatment was heat-laminated at 120°C on the polyurethane layer to form a laminate 1.
  • a thin, pitch black printed layer (thickness: 3 ⁇ ) formed on yet another PET film with a thickness of 50 ⁇ subjected to mold release treatment was heat-laminated at 120°C on the indium vapor-deposited layer of the laminate 1 to form a laminate 2.
  • a multilayer extruded film with a thickness of 105 ⁇ including a fluorine resin layer and an acrylic resin layer was subjected to emboss finishing on the fluorine resin layer side using a heating cylinder having a hairline shape to form a surface layer.
  • a laminate 3 was formed by heat-laminating the surface layer at 120°C on the pitch black printed layer so that the non-embossed surface was in contact with the pitch black printed layer.
  • a white acrylic adhesive layer with a thickness of 40 ⁇ was then formed on a liner prepared by forming a melamine mold release layer on a PET film. After the PET film supporting the printed layer with a wood pattern was removed from the laminate 3, a white acrylic adhesive layer was heat-laminated at 50°C on the printed layer with a wood pattern to produce a light-transmissive decorative film.
  • the liner (ACW200) was removed from the light-transmissive decorative film, and this was pressure-bonded at 145°C with a vacuum/pressure forming method onto a transparent polycarbonate substrate having a semi-cylindrical three-dimensionally curved face to produce a molded product to which the light-transmissive decorative film was attached.
  • a light-transmissive decorative film and a molded article were produced in the same manner as in Example 4 with the exception that a tin vapor-deposited layer having an OD value of 1.2 was used instead of an indium vapor-deposited layer.
  • a light-transmissive decorative film and a molded article were produced in the same manner as in Example 4 with the exception that multilayer vapor-deposited film including an indium vapor-deposited layer and a tin vapor-deposited layer having an OD value of 1.7 was used instead of an indium vapor-deposited layer.
  • a light-transmissive decorative film was produced in accordance with the following procedure.
  • a "cast” pattern was formed as a printed layer by inkjet printing on a polyvinyl chloride film with a thickness of 80 ⁇ having an acrylic transparent adhesive layer with a thickness of 30 ⁇ covered by a PET film with a thickness of 50 ⁇ subjected to mold release treatment to form a laminate 1.
  • Two indium vapor-deposited layers were formed in a superimposed manner on a polyurethane layer formed with a thickness of 20 ⁇ using a water-based urethane solution on another PET film with a thickness of 50 ⁇ subjected to mold release treatment.
  • the OD value of the indium vapor-deposited layer determined using a Gretag Macbeth D200-II concentration meter was 0.7.
  • a thin, pitch black printed layer (thickness: 3 ⁇ ) formed on another PET film with a thickness of 50 ⁇ subjected to mold release treatment was laminated on the indium vapor-deposited layer.
  • the PET film supporting the polyurethane layer was removed, and an acrylic transparent adhesive layer with a thickness of 30 ⁇ supported on the PET film with a thickness of 50 ⁇ subjected to mold release treatment was laminated on the polyurethane layer to form a laminate 2.
  • a multilayer extruded film with a thickness of 105 ⁇ including a fluorine resin layer and an acrylic resin layer was subjected to emboss finishing on the fluorine resin layer side using a heating cylinder having a hairline shape to form a surface layer.
  • the acrylic transparent adhesive layer with a thickness of 30 ⁇ supported on the PET film with a thickness of 50 ⁇ subjected to mold release treatment was laminated on the non-embossed surface of the surface layer to form a laminate 3.
  • a laminate 4 was formed by laminating onto the pitch black printed layer so that the acrylic transparent adhesive layer of the laminate 3 was in contact with the pitch black printed layer.
  • a light-transmissive decorative film was produced by laminating the laminate 4 and the laminate 1 so that the acrylic transparent adhesive layer of the laminate 4 was in contact with the printed layer of the laminate 1.
  • the PET film was removed from the light-transmissive decorative film, and this was pressure-bonded at 120°C with a vacuum/pressure forming method onto a transparent polycarbonate substrate having a semi-cylindrical three-dimensionally curved face to produce a molded product to which the light-transmissive decorative film was attached.
  • a light-transmissive decorative film and a molded article were produced in the same manner as in Example 7 with the exception that the printed layer on the polyvinyl chloride film was changed from a "cast" pattern to a dot and circle pattern.
  • a light-transmissive decorative film was produced in accordance with the following procedure.
  • a "cast” pattern was formed as a printed layer by inkjet printing on a polyvinyl chloride film with a thickness of 80 ⁇ having an acrylic transparent adhesive layer with a thickness of 30 ⁇ covered by a PET film with a thickness of 50 ⁇ subjected to mold release treatment to form a laminate 1.
  • Two indium vapor-deposited layers were formed in a superimposed manner on a polyurethane layer formed with a thickness of 20 ⁇ using a water-based urethane solution on another PET film with a thickness of 50 ⁇ subjected to mold release treatment.
  • the OD value of the indium vapor-deposited layer determined using a Gretag Macbeth D200-II concentration meter was 0.7.
  • the PET film supporting the polyurethane layer was removed, and an acrylic transparent adhesive layer with a thickness of 30 ⁇ supported on the PET film with a thickness of 50 ⁇ subjected to mold release treatment was laminated on the polyurethane layer to form a laminate 2.
  • a multilayer extruded film with a thickness of 105 ⁇ including a fluorine resin layer and an acrylic resin layer was subjected to emboss finishing on the fluorine resin layer side using a heating cylinder having a hairline shape to form a surface layer.
  • the acrylic transparent adhesive layer with a thickness of 30 ⁇ supported on the PET film with a thickness of 50 ⁇ subjected to mold release treatment was laminated on the non-embossed surface of the surface layer to form a laminate 3.
  • a laminate 4 was formed by laminating onto the indium vapor-deposited layer so that the acrylic transparent adhesive layer of the laminate 3 was in contact with the indium vapor-deposited layer.
  • a light-transmissive decorative film was produced by laminating the laminate 4 and the laminate 1 so that the acrylic transparent adhesive layer of the laminate 4 was in contact with the printed layer of the laminate 1.
  • the PET film was removed from the light-transmissive decorative film, and this was pressure-bonded at 120°C with a vacuum/pressure forming method onto a transparent polycarbonate substrate having a semi-cylindrical three-dimensionally curved face to produce a molded product to which the light-transmissive decorative film was attached.
  • a light-transmissive decorative film and a molded article were produced in the same manner as in Comparative Example 3 with the exception that the printed layer on the polyvinyl chloride film was changed from a "cast" pattern to a dot and circle pattern.
  • a white LED was disposed below the transparent polycarbonate substrate of the molded article used for appearance evaluation, and this was placed in a dark room (simple tabletop dark room BBX-01, As One Corporation (Osaka-shi, Osaka, Japan).
  • An LED tape light product name: Minger LED tape light for car interior decoration, LED type 5050, output power: 10 W (2.5 W > 4 tapes), source: Shenzhen Minger E-commerce Co., Ltd. (Shenzhen City, Guandong province, People's Republic of China)) or an LED surface light-emitting light (LED trace stand, A4 size, power output: 1.8 W, thickness: 5 mm, Unigear (Best Saving Biz ((People's Republic of China))) was used as a light source.
  • the molded article was observed from directly above in a state in which the white LED was turned on in a dark room, and the appearance was evaluated based on the clarity of the wood pattern, the "cast” pattern, or the dot and circle pattern (second design) under the criteria shown in Table 3.
  • Table 3 Appearance evaluation criteria when a white LED lamp is on in a dark room
  • the total light transmittance of the light-transmissive decorative film was measured.
  • the average value among values measured using an NDH 5000 haze meter (Nippon Denshoku Industries Co., Ltd. (Bunkyo-ku, Tokyo, Japan)) for three areas of the region enclosed by a circle 3 cm in diameter was used as the total light transmittance.
  • the total light transmittance of the laminate 2 including a pitch black printed layer and an indium vapor-deposited layer Examples 7 and 8) and the total light transmittance of the laminate 2 including an indium vapor-deposited layer (Comparative Examples 3 and 4) were also measured.
  • the illuminance of light that can be seen through the molded article when the white LED lamp is on was measured by placing a black acrylic plate at a position 15 cm vertically away from the center of the surface of the molded article in a dark room to form a measurement surface, and then using the average value among values measured with illuminance meters (T-10M, Konica Minolta Japan, Inc. (Minato-ku, Tokyo, Japan) placed at equal intervals at 12 points (3 x4 points) on the plate as the illuminance (lm/m 2 ).
  • T-10M Konica Minolta Japan, Inc. (Minato-ku, Tokyo, Japan) placed at equal intervals at 12 points (3 x4 points) on the plate as the illuminance (lm/m 2 ).
  • N.A. indicates that there are no measurement results.

Landscapes

  • Laminated Bodies (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)

Abstract

L'invention porte sur un film décoratif qui peut fournir une conception qui change en raison de la lumière dans l'environnement ambiant et de la lumière provenant d'une source de lumière disposée derrière le film décoratif, et qui peut être utilisé dans un procédé de moulage pour recouvrir un article ayant une forme tridimensionnelle par étirement thermique. Le film décoratif de transmission de lumière selon un mode de réalisation de la présente invention, qui peut recouvrir un article ayant une forme tridimensionnelle par étirement thermique, comprend une couche de conception supérieure dotée d'une transparence optique, une couche réfléchissante, et une couche de conception inférieure dotée d'une transparence optique dans cet ordre, et la valeur DO de la couche réfléchissante étant de 0,7 à 1,7.
EP18811919.2A 2017-11-08 2018-11-05 Film décoratif de transmission de lumière, article moulé contenant un film décoratif de transmission de lumière, procédé de production associé et dispositif d'affichage d'éclairage Withdrawn EP3706995A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2017215578 2017-11-08
JP2018192536A JP2019084821A (ja) 2017-11-08 2018-10-11 光透過性加飾フィルム、光透過性加飾フィルムを含む成形品及びその製造方法並びに照明表示装置
PCT/IB2018/058680 WO2019092582A1 (fr) 2017-11-08 2018-11-05 Film décoratif de transmission de lumière, article moulé contenant un film décoratif de transmission de lumière, procédé de production associé et dispositif d'affichage d'éclairage

Publications (1)

Publication Number Publication Date
EP3706995A1 true EP3706995A1 (fr) 2020-09-16

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EP (1) EP3706995A1 (fr)
JP (1) JP2019084821A (fr)
CN (1) CN111315572A (fr)

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Publication number Priority date Publication date Assignee Title
JP7298338B2 (ja) * 2019-06-27 2023-06-27 豊田合成株式会社 加飾シート及び発光装置
CN114096410A (zh) 2019-07-01 2022-02-25 阿尔卑斯阿尔派株式会社 装饰片及静电输入装置
JP7500976B2 (ja) * 2020-01-28 2024-06-18 大日本印刷株式会社 金属調加飾成形品の製造方法、金属調加飾成形品、表示装置
CN114606780B (zh) * 2022-03-23 2024-02-27 本田技研工业(中国)投资有限公司 一种透光pu合成革及其制备方法
JP2024066410A (ja) * 2022-11-01 2024-05-15 大日本印刷株式会社 積層体及び加飾物品

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JP2010521340A (ja) * 2007-03-15 2010-06-24 イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー 金属化フィルム
JP5346632B2 (ja) * 2009-03-17 2013-11-20 信越ポリマー株式会社 電波透過性加飾フィルムおよびこれを用いた装飾部材
JP6709018B2 (ja) * 2015-02-04 2020-06-10 スリーエム イノベイティブ プロパティズ カンパニー 加飾フィルム及びそれと一体化した物品

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CN111315572A (zh) 2020-06-19

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