Laminated film and decorated laminated structure

Abstract

Provided are a laminated film and a decorative laminated structure with which it is possible to achieve both concealability and visibility. This laminated film is provided with a first film and a first layer. The first film contains an inorganic pigment and an organic pigment. A design layer, the first layer, and the first film may be disposed in that order. The first layer, the design layer, and the first film may be disposed in that order. The first layer is a design layer. The design layer may adjoin the first film.

Description

[Technical field]

[0001] The present disclosure relates to a laminate film and a decorated laminate structure. [Background technology]

[0002] Conventionally, films or sheets that have excellent concealing properties while allowing characters or the like displayed on a display or the like arranged on the back side to be visible have been studied. For example, Patent Document 1 discloses a leather-like sheet having a colored resin layer arranged to cover a light-emitting member, the surface on the light-emitting member side being a first main surface and the opposite side being a second main surface, the total light transmittance as viewed from the second main surface side being in the range of 3 to 10%, the haze being 99% or less, and no fiber base material being present when viewed in the thickness direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-083107 A Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, there has been a demand for a film that, when attached to the surface of a substrate equipped with a light source such as a display, makes the presence of a floodlight unrecognizable when the light source is turned off, but allows characters and patterns displayed on the floodlight to be seen when the light source is turned on. It is desired that complex and colorful patterns and characters be clearly visible even when they are displayed on a display, etc., and in particular, films laminated on substrates equipped with a light source are required to have excellent visibility in addition to hiding properties.

[0005] The present invention has been made in consideration of the above-mentioned current situation, and has an object to provide a laminate film and a decorated laminate structure that can achieve both hiding properties and visibility. [Means for solving the problem]

[0006] (1) One embodiment of the present invention includes a first film and a first layer, The first film is a laminated film characterized in that it contains an inorganic pigment and an organic pigment.

[0007] (2) Also, one embodiment of the present invention is a laminate film having a design layer, the first layer, and the first film arranged in this order in addition to the configuration of (1) above.

[0008] (3) Furthermore, one embodiment of the present invention is a laminate film having the above-mentioned configuration (1) and further including the above-mentioned first layer, a design layer, and the above-mentioned first film arranged in this order.

[0009] (4) Furthermore, in one embodiment of the present invention, in addition to the configuration of (1) above, the first layer is a design layer, and the design layer is a laminate film that is in contact with the first film.

[0010] (5) Moreover, in one embodiment of the present invention, in addition to any one of the configurations (1) to (4) above, the inorganic pigment comprises carbon black.

[0011] (6) Moreover, in one embodiment of the present invention, in addition to any one of the configurations (1) to (5) above, the organic pigment is a laminate film containing at least one organic pigment selected from a quinacridone pigment, a phthalocyanine blue, and an azo pigment.

[0012] (7) Moreover, in one embodiment of the present invention, in addition to any one of the above (1) to (6), the organic pigment is a laminate film containing a metal complex.

[0013] (8) Moreover, in one embodiment of the present invention, in addition to any one of the configurations (2) to (7) above, the design layer is a laminate film containing a pearl pigment.

[0014] (9) Moreover, in one embodiment of the present invention, in addition to any one of the above configurations (1) to (8), the first film is a laminate film which is a polyvinyl chloride film.

[0015] (10) Also, one embodiment of the present invention is a laminate film having the configuration of (1), (2), (3), (5), (6), (7) or (8) above, wherein the first film and the first layer are polyvinyl chloride films.

[0016] (11) Furthermore, one embodiment of the present invention is a laminate film having any one of the configurations (1) to (10) above, further comprising a pressure-sensitive adhesive layer on the side of the first film opposite to the side on which the first layer is disposed.

[0017] (12) Moreover, in one embodiment of the present invention, in addition to the configuration of (11) above, the pressure-sensitive adhesive layer is a laminate film containing an acrylic pressure-sensitive adhesive.

[0018] (13) Another embodiment of the present invention is a decorated laminated structure comprising the laminated film according to (11) or (12) above and a substrate laminated thereon via the pressure-sensitive adhesive layer. Effect of the Invention

[0019] The laminate film and the decorated laminate structure of the present invention can achieve both hiding power and visibility. [Brief description of the drawings]

[0020] [Figure 1] FIG. 2 is a cross-sectional schematic diagram illustrating a laminated film according to an embodiment, the laminated film having a first film and a second film. [Diagram 2] 1 is a schematic cross-sectional view illustrating a laminate film according to an embodiment, the laminate film having a first film and a design layer. [Diagram 3] 1 is a schematic cross-sectional view illustrating a laminated film according to an embodiment, in which a design layer, a second film, and a first film are laminated in this order. [Figure 4] 1 is a schematic cross-sectional view illustrating a laminated film according to an embodiment, in which a second film, a design layer, and a first film are laminated in this order. [Diagram 5]4 is a schematic cross-sectional view of a laminated film illustrating the laminated film of FIG. 3 further having a pressure-sensitive adhesive layer. FIG. [Figure 6] 5 is a schematic cross-sectional view of a laminated film illustrating the laminated film of FIG. 4 further having a pressure-sensitive adhesive layer. FIG. [Figure 7] 6 is a schematic cross-sectional view of a decorated laminated structure including the laminated film of FIG. 5. [Figure 8] 7 is a schematic cross-sectional view of a decorated laminated structure including the laminated film of FIG. 6. [Figure 9] 3A and 3B are photographs of the laminated film according to Example 1 when the light source is turned off and on. [Figure 10] 4 is a photograph of the laminate film according to Example 2 when the light source is turned off and on. FIG. [Figure 11] 1A and 1B are photographs of the laminated film according to Example 3 when the light source is turned off and on. [Figure 12] 1A and 1B are photographs of the laminated film according to Example 4 when the light source is turned off and on. [Figure 13] 11 is a photograph of the laminate film according to Example 5 when the light source is turned off and on. FIG. [Figure 14] 11 is a photograph of the laminate film according to Example 6 when the light source is turned off and on. FIG. [Figure 15] 11 is a photograph of the laminate film according to Example 7 when the light source is turned off and on. FIG. [Figure 16] 1 is a photograph of the laminated film according to Comparative Example 1 when the light source is turned off and on. [Figure 17] 1 is a photograph of a laminated film according to Comparative Example 2 when the light source is turned off and on. [Figure 18] 11 is a photograph of the laminated film according to Comparative Example 3 when the light source is turned off and on. FIG. [Figure 19] 13 is a photograph of the laminated film according to Comparative Example 4 when the light source is turned off and on. FIG. [Figure 20] 13 is a photograph of the laminated film according to Comparative Example 5 when the light source is turned off and on. FIG. [Figure 21]13 is a photograph of the laminated film according to Comparative Example 6 when the light source is turned off and on. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] The laminated film according to the embodiment includes a first film and a first layer, and the first film contains an inorganic pigment and an organic pigment. The first film is a resin film containing a resin component and processed into a sheet. The first layer may be a resin film, a design layer, a coating layer of a resin composition, or the like.

[0022] The first film is a semi-transparent film containing an inorganic pigment and an organic pigment. The first film contains both an inorganic pigment and an organic pigment, so that it can achieve both hiding properties and excellent visibility. The hiding properties refer to the fact that, when a substrate is placed on the back side (first film side) of the laminated film, the outer edge of the substrate is not visible. The visibility refers to the fact that, when a projecting device equipped with a light source such as a display is placed on the back side (first film side) of the laminated film, characters, patterns, etc. displayed on a display or the like can be seen, and it is preferable that the outer edges of the displayed characters, patterns, etc. can be clearly seen.

[0023] With inorganic pigments alone, it is possible to increase the hiding power, but it is difficult to ensure visibility, so that both hiding power and visibility cannot be achieved at the same time.On the other hand, with organic pigments alone, it is easy to ensure visibility, but it is difficult to ensure hiding power, so that both hiding power and visibility cannot be achieved at the same time.

[0024] Examples of the inorganic pigment include carbon, titanium, zinc, iron, chromium, lead, molybdenum, cadmium, bismuth, cobalt, aluminum, copper, gold, silver, barium, silica, kaolin, talc, antimony, nickel, or compounds containing alloys thereof. More specifically, carbon black, titanium oxide, zinc oxide, iron oxide, chromium oxide, yellow lead (lead chromate), chrome vermilion, cadmium yellow, cadmium red, bismuth vanadate, cobalt blue, cobalt green, titanium yellow, aluminum powder, brass powder, gold colloid, silver colloid, barium sulfate, silica, kaolin clay, talc, aluminum hydroxide, zinc sulfide, antimony oxide, etc. Among them, the inorganic pigment preferably contains carbon black because of its high hiding effect. These may be used alone or in combination of two or more.

[0025] The content of the above inorganic pigment is preferably 0.01 parts by mass or more and 1 part by mass or less, more preferably 0.04 parts by mass or more and 0.5 parts by mass or less, and even more preferably 0.05 parts by mass or more and 0.2 parts by mass or less, relative to 100 parts by mass of the resin component.

[0026] Examples of the organic pigment include condensed polycyclic pigments and azo pigments. The condensed polycyclic pigments preferably include at least one of quinacridone pigments, anthraquinone pigments, indigo pigments, perinone pigments, perylene pigments, phthalone pigments, dioxazine pigments, isoindolinone pigments, ditopyrrolopyrrole pigments, and phthalocyanine pigments. Specific examples of the quinacridone pigments include unsubstituted quinacridone, quinacridone red, quinacridone magenta, quinacridone scarlet, and quinacridone maroon. The azo pigments preferably include at least one of β-naphthol, β-oxynaphthoic acid, naphthol AS, acetoacetate arylide, naphthalenesulfonic acid, and pyrazolone. These may be used alone or in combination of two or more.

[0027] The organic pigment may include at least one organic pigment selected from the group consisting of quinacridone pigments, phthalocyanine blue, and azo pigments.

[0028] From the viewpoint of weather resistance, it is preferable that the organic pigment contains a metal complex. The metal complex is a complex of a metal ion and an organic compound (ligand) bonded to the metal ion. By containing the metal complex, discoloration during outdoor use can be reduced.

[0029] Examples of organic pigments containing the above metal complexes include phthalocyanine blue, phthalocyanine green, nickel azo yellow, copper azomethine yellow, nickel complex orange, and nickel azomethine red, which are formed by combining copper ions with a phthalocyanine compound.

[0030] The content of the above organic pigment is preferably 0.01 parts by mass or more and 2 parts by mass or less, more preferably 0.05 parts by mass or more and 0.5 parts by mass or less, and even more preferably 0.1 parts by mass or more and 0.5 parts by mass or less, relative to 100 parts by mass of the resin component.

[0031] The blending ratio of the inorganic pigment to the organic pigment is preferably from 1:0.2 to 1:5, more preferably from 1:0.5 to 1:2, and even more preferably from 1:1.1 to 1:1.9.

[0032] The first film may be made of a non-polar resin such as polyethylene or polypropylene, or a polar resin such as polyurethane or polyvinyl chloride. Among the resin components, a polyvinyl chloride film containing a vinyl chloride resin is preferable. When the laminated film is attached to a substrate, the polyvinyl chloride film has good elongation, so it follows the surface shape of the substrate and is difficult to break. In addition, when the film is attached to the substrate and integrated, it can be molded at a relatively low temperature (about 120°C). The polyvinyl chloride film preferably has a vinyl chloride resin content of 50% by mass or more, more preferably 90% by mass or more, of the entire resin components of the film.

[0033] Examples of the vinyl chloride resin include a homopolymer of vinyl chloride and a copolymer of vinyl chloride with another monomer.

[0034] Examples of the other monomers include vinyl esters such as vinyl acetate and vinyl propionate; olefins such as ethylene, propylene, and styrene; (meth)acrylic esters such as methyl acrylate, ethyl acrylate, and methyl methacrylate; maleic diesters such as dibutyl maleate and diethyl maleate; fumaric diesters such as dibutyl fumarate and diethyl fumarate; vinyl cyanides such as acrylonitrile and methacrylonitrile; vinyl halides such as vinylidene chloride and vinyl bromide; vinyl ethers such as methyl vinyl ether and ethyl vinyl ether, etc. These may be used alone or in combination of two or more.

[0035] The content of the other monomer in the copolymer is usually 50% by mass or less, preferably 10% by mass or less. If it exceeds 50% by mass, the bending resistance of the film may decrease. Among the vinyl chloride resins, a homopolymer of vinyl chloride is preferred because it provides dimensional stability.

[0036] The average degree of polymerization of the vinyl chloride resin may be, for example, 750 to 1300. When the average degree of polymerization is within the range of 750 to 1300, the moldability at a relatively low temperature is good. On the other hand, when the average degree of polymerization is less than 750, the laminated film according to the present embodiment is not sufficiently stretched when it is laminated and integrally molded with a substrate, and the film may not follow the shape of the substrate. On the other hand, when the average degree of polymerization is more than 1300, the processability in calendar molding for obtaining a polyvinyl chloride film may decrease, and the appearance of the film surface may deteriorate. In addition, the shrinkage rate of the film after molding may increase, and it may become difficult to maintain the shape. The average degree of polymerization is more preferably 1000 to 1300. The average degree of polymerization of the vinyl chloride resin means the average degree of polymerization measured in accordance with JIS K6721 "Testing method for vinyl chloride resin".

[0037] The polyvinyl chloride film preferably contains a plasticizer. The content of the plasticizer is preferably 7 parts by mass or more and 35 parts by mass or less with respect to 100 parts by mass of vinyl chloride resin. By setting the content of the plasticizer within the above range, flexibility and moldability suitable for calendar molding and the like can be obtained. In addition, elongation suitable for attaching the laminated film according to the present embodiment to a substrate and performing vacuum / pressure molding and the like can be obtained. If the content of the plasticizer is less than 7 parts by mass, the polyvinyl chloride film becomes too hard, and there is a risk that the film will break during molding. On the other hand, if the content exceeds 35 parts by mass, the polyvinyl chloride film becomes too soft, and the handling properties may be reduced. The content of the plasticizer is more preferably 15 parts by mass or more and 30 parts by mass or less with respect to 100 parts by mass of vinyl chloride resin.

[0038] Examples of the plasticizer include phthalic acid diesters such as bis(2-ethylhexyl) phthalate (DOP), diisononyl phthalate (DINP), diisodecyl phthalate (DIDP), and diundecyl phthalate (DUP); aliphatic dibasic acid diesters such as dioctyl adipate and dioctyl sebacate; phosphate triesters such as tricresyl phosphate and trioctyl phosphate; epoxy-based plasticizers such as epoxidized soybean oil and epoxy resins; and polymer polyester plasticizers. Among these, phthalic acid diesters are preferred. DUP is preferred because it is not subject to various environmental regulations, has little odor during film formation, and causes little contamination of the forming machine during film formation.

[0039] The first film may contain additives such as stabilizers, ultraviolet absorbers, processing aids, and modifiers, if necessary.

[0040] The thickness of the first film is preferably 50 μm or more and 300 μm or less. If the thickness of the first film is less than 50 μm, the concealing property may decrease. On the other hand, if the thickness of the first film exceeds 300 μm, the amount of heat may be insufficient or the processing speed may decrease when the first film is thermally laminated with other layers such as the second film described later. In addition, this leads to an increase in the thickness of the entire laminated film, which may decrease the processability when integrating the laminated film with the substrate. The thickness of the first film is more preferably 70 μm or more and 200 μm or less, and even more preferably 150 μm or less.

[0041] The first layer is preferably disposed on the front side of the first film. The first layer is preferably a layer that imparts color or design to the laminated film. In this specification, the front side refers to the side that is closer to the viewer when the laminated film is used, and is also called the viewer side. The back side refers to the side opposite to the front side.

[0042] The first layer may be a resin film. When the first layer is a resin film, it is also referred to as a second film below. FIG. 1 is a cross-sectional schematic diagram illustrating a laminated film according to an embodiment having a first film and a second film. As shown in FIG. 1, the laminated film 10A according to the embodiment may be laminated in the order of a second film 2 and a first film 1 from the front side.

[0043] The second film is preferably a resin film containing a resin component. The second film may be transparent or may be a colored film containing a colorant such as a pigment. The second film preferably has a total light transmittance of 80% or more. In this specification, the total light transmittance is a value measured by a method in accordance with JIS K 7361.

[0044] The second film may be a polyvinyl chloride film. In particular, when the first film is a polyvinyl chloride film, the second film is preferably a polyvinyl chloride film. As the material of the polyvinyl chloride film, those listed for the first film can be used. The first film and the second film may be laminated by thermal lamination in which the films are heated and pressed. It is preferable that the first film and the second film are in contact with each other.

[0045] From the viewpoint of preventing peeling off or warping from the first film, it is preferable that the second film is equivalent to the first film in terms of the plasticizer content and film thickness.

[0046] The plasticizer may be any of those listed for the first film. The content of the plasticizer is preferably 7 parts by mass or more and 35 parts by mass or less, and more preferably 15 parts by mass or more and 30 parts by mass or less, based on 100 parts by mass of the vinyl chloride resin.

[0047] The thickness of the second film is preferably 50 μm or more and 300 μm or less, more preferably 70 μm or more and 200 μm or less, and even more preferably 150 μm or less.

[0048] The first layer may be a design layer. Fig. 2 is a schematic cross-sectional view illustrating a laminated film according to an embodiment having a first film and a design layer. As shown in Fig. 2, the laminated film 10B according to the embodiment may be laminated in the order of design layer 3 and first film 1 from the front side.

[0049] The design layer is a layer that imparts a design such as a color or a pattern to the laminated film, and is obtained, for example, by printing with ink, etc. The design layer may have, for example, a wood grain, a geometric pattern, or other pattern, or letters, etc.

[0050] The ink may contain a coloring material, a binder resin, a solvent, etc., and examples of the coloring material include pigments, dyes, and inorganic fillers such as titanium oxide. Examples of the binder resin include vinyl acetate, acrylic resin, and acrylic urethane resin. The pigment may be an inorganic pigment or an organic pigment, or an inorganic pigment and an organic pigment may be used in combination.

[0051] The design layer preferably further contains a pearl pigment. The pearl pigment is a pigment that can reflect a part of incident light and impart a pearl-like luster. The pearl pigment may be a metal single crystal type, or may be a base material coated with a metal oxide (metal oxide-coated type). Examples of single crystal type pearl pigments include basic lead carbonate and bismuth oxychloride. Examples of metal oxide-coated type pearl pigments include mica, alumina flakes, silica flakes, glass flakes, etc., which are used as base materials and coated with metal oxides such as titanium oxide and iron oxide, and more specifically, titanium dioxide-coated mica and iron oxide-coated mica are included. These may be used alone or in combination of two or more types.

[0052] The design layer has a thickness of, for example, 1 to 10 μm. The ink weight is, for example, 0.5 g / m 2 More than 12g / m 2 The following is the result.

[0053] The printing method is not particularly limited, and gravure printing, offset printing, flexographic printing, screen printing, etc. can be used. From the viewpoint of good printability on resin films such as polyvinyl chloride films, gravure printing is preferred.

[0054] FIG. 3 is a cross-sectional schematic diagram illustrating a laminated film according to an embodiment in which the design layer, the second film, and the first film are laminated in this order. FIG. 4 is a cross-sectional schematic diagram illustrating a laminated film according to an embodiment in which the second film, the design layer, and the first film are laminated in this order. The laminated film 10A shown in FIG. 1 may further include a design layer, and the laminated film according to the embodiment may be a laminated film 10C in which the design layer 3, the second film 2, and the first film 1 are arranged in this order from the front side as shown in FIG. 3, or a laminated film 10D in which the second film 2, the design layer 3, and the first film 1 are arranged in this order from the front side as shown in FIG. 4. The laminated film 10B shown in FIG. 2 may further include a second film and may have the configuration shown in FIG. 4.

[0055] The laminated film 10C is obtained, for example, by forming a design layer on one side of the second film, laminating a first film on the side of the second film opposite to the side on which the design layer is formed (the side on which the design layer is not formed), and thermally laminating the film. The laminated film 10D is obtained, for example, by forming a design layer on one side of the second film, laminating the first film and the second film so that the design layer and the first film face each other, and thermally laminating the film. The design layer may be formed on the first film, and for example, the laminated film 10C is obtained by forming a design layer on one side of the first film, laminating a second film on the side of the first film opposite to the side on which the design layer is formed (the side on which the design layer is not formed), and thermally laminating the film. The laminated film 10D is obtained, for example, by forming a design layer on one side of the first film, laminating the first film and the second film so that the design layer and the second film face each other, and thermally laminating the film. In laminate film 10C and laminate film 10D, the second film and the design layer are preferably in contact with each other, and the design layer and the first film are preferably in contact with each other.

[0056] The laminated film according to the embodiment may further include a pressure-sensitive adhesive layer on the surface of the first film opposite to the surface on which the first layer is disposed. FIG. 5 is a cross-sectional schematic diagram of a laminated film illustrating a case where the laminated film of FIG. 3 further includes a pressure-sensitive adhesive layer. FIG. 6 is a cross-sectional schematic diagram of a laminated film illustrating a case where the laminated film of FIG. 4 further includes a pressure-sensitive adhesive layer. FIG. 5 illustrates a laminated film 10E having a pressure-sensitive adhesive layer 4 on the surface of the first film 1 opposite to the surface on which the second film 2 is disposed, and FIG. 6 illustrates a laminated film 10F having a pressure-sensitive adhesive layer 4 on the surface of the first film 1 opposite to the surface on which the design layer 3 is disposed. However, the pressure-sensitive adhesive layer 4 may be provided on the surface of the laminated film 10A shown in FIG. 1 opposite to the surface on which the second film 2 is disposed, or the pressure-sensitive adhesive layer 4 may be provided on the surface of the laminated film 10B shown in FIG. 2 opposite to the surface on which the design layer 3 of the first film 1 is disposed.

[0057] The pressure-sensitive adhesive layer is not particularly limited, and may contain a pressure-sensitive adhesive such as an acrylic pressure-sensitive adhesive, a rubber pressure-sensitive adhesive, a silicone pressure-sensitive adhesive, etc. Among these, an acrylic pressure-sensitive adhesive is preferred because it is excellent in adhesion, processability, heat aging resistance, moisture aging resistance, moldability, and weather resistance, and is relatively inexpensive.

[0058] The acrylic adhesive is an adhesive containing an acrylic polymer. The adhesive layer 4 may contain a known crosslinking agent such as an isocyanate curing agent or an epoxy curing agent.

[0059] The thickness of the pressure-sensitive adhesive layer is preferably 20 μm or more and 70 μm or less, more preferably 30 μm or more and 55 μm or less. It is preferable that the pressure-sensitive adhesive layer does not decrease the transparency, and from this point of view, the thickness of the pressure-sensitive adhesive layer is preferably within the above-mentioned range.

[0060] The first film and the pressure-sensitive adhesive layer may be in contact with each other. Although not shown, a primer layer may be provided between the first film and the pressure-sensitive adhesive layer. By providing a primer layer, the adhesion between the first film and the pressure-sensitive adhesive layer can be improved. In addition, when the design layer is formed with ink, the ink may bleed if it comes into contact with the primer layer, so it is preferable that the primer layer and the design layer do not come into contact with each other.

[0061] The laminated film according to the embodiment may be subjected to a surface treatment such as embossing on the outermost surface as necessary. By providing an embossed shape (uneven shape), the laminated film can be given a desired texture. The embossing may provide a woven pattern (carbon pattern) such as a grain, wood grain, leather grain, plain weave, or twill weave.

[0062] The total thickness of the laminate film according to the embodiment, excluding the thickness of the pressure-sensitive adhesive layer, is preferably 100 μm or more and 600 μm or less, more preferably 150 μm or more and 400 μm or less, and even more preferably 180 μm or more and 350 μm or less.

[0063] The laminated film according to the embodiment has a total light transmittance of preferably 50% or less, more preferably 30% or less. The lower limit of the total light transmittance is, for example, 1%. In this specification, the total light transmittance is a value measured by a method conforming to JIS K 7361. The total light transmittance can be measured, for example, using "Haze Mater NDH5000" manufactured by Nippon Denshoku Industries Co., Ltd.

[0064] The laminated film of this embodiment is laminated integrally with a substrate to obtain a decorated laminated structure 100. Fig. 7 is a schematic cross-sectional view of a decorated laminated structure including the laminated film of Fig. 5. Fig. 8 is a schematic cross-sectional view of a decorated laminated structure including the laminated film of Fig. 6. Fig. 7 illustrates a case where the laminated film 10E and the substrate 20 are laminated via the adhesive layer 4, and Fig. 8 illustrates a case where the laminated film 10F and the substrate 20 are laminated via the adhesive layer 4. However, the adhesive layer 4 may be formed on the surface opposite to the surface on which the second film 2 of the laminated film 10A shown in Fig. 1 is arranged and laminated with the substrate 20, or the adhesive layer 4 may be formed on the surface opposite to the surface on which the design layer 3 of the first film 1 of the laminated film 10B shown in Fig. 2 is arranged and laminated with the substrate 20.

[0065] The decorated laminated structure according to the present embodiment can be obtained, for example, by laminating and integrating a laminated film on a substrate via an adhesive layer. Examples of methods for laminating a laminated film on a substrate include a method of heating the laminated film and laminating it on the substrate. Examples of methods include thermoforming, vacuum forming, pressure forming, vacuum-pressure forming, wrapping, and the like. A specific example of vacuum forming is a method of laminating a laminated film on a substrate at a heater heating temperature of 80 to 140°C using a TOM forming machine (manufactured by Fuse Vacuum Co., Ltd., model number: NGF-0406) as a vacuum-pressure forming machine. A specific example of wrapping is a method of warming and softening a laminated film with a dryer and laminating it along the substrate.

[0066] The laminate film according to this embodiment has excellent concealing properties and can prevent the substrate from being seen through, and therefore can be used for concealing the substrate or for decorating the substrate by imparting a design to the surface.

[0067] The substrate used in the decorative laminate structure according to this embodiment is not particularly limited, and examples thereof include interior components for vehicles such as automobiles; home appliances such as air conditioners; and mobile devices such as smartphones and tablets.

[0068] The material constituting the above-mentioned substrate is not particularly limited, and examples thereof include resins such as polycarbonate resins, acrylic resins, styrene resins, acrylonitrile-butadiene-styrene (ABS) resins, and polypropylene (PP) resins; metals such as iron, copper, and aluminum; alloys; and wood materials such as MDF (medium density fiberboard).

[0069] The laminated film according to the present embodiment is excellent not only in concealment but also in visibility, and is therefore suitable for use as a light-transmitting film that transmits a portion of light. When the laminated film according to the present embodiment is used as a light-transmitting film, it is preferable to use a light-projecting device such as a lighting device or a display having a light source that emits light toward the observer as the substrate. When a light-projecting device is disposed on the rear side of the laminated film, the light-projecting device can be concealed by the laminated film when the light source is turned off, making it difficult for the observer to visually recognize the presence of the light-projecting device, and the observer visually recognizes the pattern, color, etc. of the first layer of the laminated film. On the other hand, when the light source is turned on, the observer can visually recognize, for example, a display image displayed on a light-projecting device such as a display. EXAMPLES

[0070] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

[0071] The film materials used in the examples and comparative examples are shown in Table 1 below, and the inorganic and organic pigments used in the examples and comparative examples are shown in Table 2 below. For the inorganic and organic pigments, masterbatches containing pigment, PVC, plasticizer, etc. were used.

[0072] [Table 1]

[0073] [Table 2]

[0074] <Film Preparation> The materials shown in Tables 1 and 2 above were mixed in the formulations shown in Tables 3 and 4 below, melt-kneaded in a Banbury mixer, and then sheet-shaped PVC films A to L were produced using an inverted L-shaped calendar. The content of each component in Tables 3 and 4 is the content relative to 100 parts by mass of vinyl chloride resin. The content of organic pigment and inorganic pigment is the content in the master batch. The total amount of organic pigment and inorganic pigment contained in the master batch was calculated from Tables 2 to 4, and the content relative to 100 parts by mass of vinyl chloride resin is shown in Tables 3 and 4. The total light transmittance of PVC film A was 90%.

[0075] [Table 3]

[0076] [Table 4]

[0077] <Preparation of laminated film> Example 1 In Example 1, PVC film B (thickness 90 μm) shown in Table 3 was used as the first film, and PVC film A (thickness 90 μm) shown in Table 3 was used as the second film. PVC film B and PVC film A were laminated and thermally laminated. A polyethylene terephthalate (PET) sheet was used as a separator, and an acrylic adhesive (Toagosei Co., Ltd.'s "Arontack" (registered trademark) MPT-29) was applied onto the separator to form an adhesive layer having a thickness of 35 μm after drying. Thereafter, the adhesive layer was attached to the surface of PVC film B opposite to the surface in contact with PVC film A, and a laminated film of Example 1 was produced in which PVC film A, PVC film B, and adhesive layer were laminated in this order.

[0078] Example 2 In Example 2, similarly to Example 1, PVC film B (thickness 90 μm) was used as the first film, and PVC film A (thickness 90 μm) was used as the second film. On one side of PVC film A, a wood grain print A was printed by gravure printing with an ink containing pearl pigment, in which a straight grain pattern was printed as a design layer. The ink used an acrylic urethane resin as a binder resin, and the content of the pearl pigment relative to the solid content of the ink (acrylic urethane resin) was 20 mass %. The basis weight of the ink was 10 g / m 2 After printing, it was dried for 1 minute at 60° C. The total light transmittance of the laminate of PVC film A and the above design layer was 81%.

[0079] PVC film B and PVC film A were laminated and thermally laminated so that the surface of PVC film A opposite to the surface on which the design layer was printed faced PVC film B. Thereafter, an acrylic adhesive layer (thickness 35 μm) was attached to the surface of PVC film B opposite to the surface in contact with PVC film A in the same manner as in Example 1, to produce a laminate film of Example 2 in which the design layer, PVC film A, PVC film B, and adhesive layer were laminated in this order.

[0080] Example 3 Except for changing the type of pearl pigment, a wood grain print B with a straight grain pattern was printed on PVC film A in the same manner as in Example 2. In Example 3, a pearl pigment different from that in Example 2 was used, and the binder resin, pearl pigment content, and ink basis weight were the same as in Example 2 to form a design layer. The total light transmittance of the laminate of PVC film A and the design layer was 72%. Thereafter, in the same manner as in Example 2, a laminate film of Example 3 was produced in which the design layer, PVC film A, PVC film B, and adhesive layer were laminated in this order.

[0081] (Examples 4 to 7) The laminate films of Examples 4 to 7 were each produced in the same manner as in Example 1, except that PVC film A, any of PVC films E to H (all 90 μm thick) shown in Table 3 were used as the first film, and the laminate films of Examples 4 to 7 were produced in the same manner as in Example 1, in which the PVC film A, one of the PVC films E to H, and the adhesive layer were laminated in that order.

[0082] (Comparative Examples 1 to 6) The laminate films of Comparative Examples 1 to 6 were produced in the same manner as in Example 1, except that the PVC films C, D, and I to L (all having a thickness of 90 μm) shown in Table 4 were used as the first film, and the laminate films were produced in the same manner as in Example 1, in which the PVC film A, any one of the PVC films C, D, and I to L, and the pressure-sensitive adhesive layer were laminated in that order.

[0083] <Evaluation test> The laminate films of the Examples and Comparative Examples were evaluated for (1) concealment property and (2) visibility by the following methods. In addition, (3) total light transmittance of each laminate film was measured. The results are shown in Tables 5 and 6 below. Figures 9 to 21 are photographs of the laminate films of Examples 1 to 7 and Comparative Examples 1 to 6 with the light source turned off and on, respectively.

[0084] (1) Evaluation of concealment (when light source is off) In a room, a smartphone (iPhone (registered trademark) 13) was placed on a black horizontal stand with the light projection surface (display screen) facing the ceiling, and the light from the room light was placed on the display screen of the smartphone from the normal direction. The laminated films of the examples and comparative examples were placed so as to cover the display screen of the smartphone. The laminated films of the examples and comparative examples were placed so that the second film was on the observer side. Note that the laminated films of the examples 2 and 3 were placed so that the arrangement direction of the wood grain pattern was different. The smartphone was visually observed from the laminated film side with the light turned off, and the concealment property was evaluated according to the following criteria. ○: The smartphone placed on the back side of the laminated film was not recognized. △: The smartphone placed on the back side of the laminated film was slightly visible. ×: The smartphone placed on the back side of the laminated film was clearly visible.

[0085] (2) Visibility evaluation (when light source is on) The Bando Chemical Co., Ltd. logo was displayed on the smartphone used in the above (1) evaluation of hiding power, and the smartphone was visually observed from the laminated film side under the same environment as the (1) evaluation of hiding power, and the visibility of the logo (visibility) was evaluated according to the following criteria. The brightness setting was 80% of the maximum brightness of the smartphone. The Bando Chemical Co., Ltd. logo had the word "BANDO" written in black on a white background, with a red straight line above the letters and a black straight line below them. 〇: The logo was clearly visible △: The logo looked blurry ×: The logo was not visible.

[0086] (3) Total light transmittance of laminated film For each of the laminated films of the Examples and Comparative Examples, the total light transmittance was measured at three arbitrary points, and the average values ​​of the measured values ​​at the three points are shown in the following Tables 5 and 6. The total light transmittance was measured by a method conforming to JIS K 7361. The measuring device used was "Haze Mater NDH5000" manufactured by Nippon Denshoku Industries Co., Ltd.

[0087] [Table 5]

[0088] [Table 6]

[0089] As shown in Figures 9 to 15, in Examples 1 to 7 in which inorganic pigments and organic pigments were used in combination in the first film, the smartphone was not visible when the light source was turned off. Furthermore, when an image was displayed on the smartphone, the displayed image (logo) was clearly visible in Examples 1, 4 to 7 as shown in Figures 9 and 12 to 15, and the logo was visible, although blurred, even in Examples 2 and 3 having a design layer as shown in Figures 10 and 11.

[0090] In Comparative Examples 1 and 3 in which only an organic pigment was added, as shown in Figs. 16 and 18, the display image (logo) was clearly visible when the light source was turned on, and the visibility was good, but when the light source was turned off, the outer edge of the smartphone was clearly visible, and no hiding power was obtained. In Comparative Example 2 in which only titanium oxide was added as an inorganic pigment, as shown in Fig. 17, when the light source was turned off, the outer edge of the smartphone was visible, although it was less clear than in Comparative Example 1, and the hiding power was insufficient, and the visibility when the light source was turned on was lower than that of Comparative Example 1. In Comparative Examples 4 to 6 in which only carbon black was added as an inorganic pigment, as shown in Figs. 19 to 21, the hiding power was good when the light source was turned off, but the logo was not visible when the light source was turned on, and the visibility was low, even if the content of carbon black was changed. From these, it was confirmed that the hiding power was insufficient with only an organic pigment, while it was difficult to adjust the visibility with only an inorganic pigment, and excellent hiding power and visibility were obtained by using an inorganic pigment and an organic pigment in combination.

[0091] Since the substrate (smartphone) placed on the back side in the turned-off state cannot be seen, the substrate to which the laminated film of this embodiment is attached is not limited to one that emits light, and it is possible to use a material that does not transmit light, such as a metal material or wood, or a transparent material such as a resin substrate that does not have a light source, and the laminated film of this embodiment can also be suitably used as a decorative film that can conceal the texture of these substrates. [Explanation of symbols]

[0092] 1: First film 2: The second film 3: Design layer 4: Adhesive layer 10A, 10B, 10C, 10D, 10E, 10F: Laminated film 20: Base material 100: Decorative laminated structure

Claims

1. A laminated film comprising a first film and a first layer, The first film contains an inorganic pigment and an organic pigment, The inorganic pigment includes carbon black, The organic pigment includes at least one organic pigment selected from the group consisting of quinacridone pigments, phthalocyanine pigments, and azo pigments, The laminate film has a total light transmittance, measured by a method in accordance with JIS K 7361, of 14.5% or more and 50% or less.

2. 2. The laminated film according to claim 1, characterized in that the design layer, the first layer, and the first film are arranged in this order.

3. 2. The laminated film according to claim 1, wherein the first layer, the design layer, and the first film are arranged in this order.

4. The first layer is a design layer, The laminated film according to claim 1 , wherein the design layer is in contact with the first film.

5. The laminated film according to claim 1 , wherein the organic pigment includes a metal complex.

6. 5. The laminate film according to claim 2, wherein the design layer contains a pearl pigment.

7. 6. The laminated film according to claim 1, wherein the first film is a polyvinyl chloride film.

8. 4. The laminated film according to claim 2, wherein the first film and the first layer are polyvinyl chloride films.

9. The laminate film according to any one of claims 1 to 5, further comprising a pressure-sensitive adhesive layer on the surface of the first film opposite to the surface on which the first layer is disposed.

10. The laminated film according to claim 9 , wherein the pressure-sensitive adhesive layer contains an acrylic pressure-sensitive adhesive.

11. 6. The laminate film according to claim 1, wherein the total light transmittance of the laminate film is 30% or less.

12. 6. The laminate film according to claim 1, wherein the laminate film is a light-transmitting film used for a substrate provided with a light source that emits light toward an observer.

13. A decorated laminated structure comprising the laminated film according to claim 9 and a substrate laminated thereon with the pressure-sensitive adhesive layer interposed therebetween.

14. The decorative laminate structure according to claim 13 , wherein the base material is provided with a light source that emits light toward a viewer.

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