KR20200002240A - Decorative film - Google Patents

Abstract

The invention relates to a decorative film, which comprises a first film including a transparent resin layer, and a second film including a decorative layer. The first film comprises the transparent resin layer and a transparent metal oxide layer disposed on the transparent resin layer, and the second film comprises a base layer and a decorative layer disposed on the base layer. In addition, the transparent metal oxide layer is disposed between the transparent resin layer and the decorative layer and consists of high refractive index metal oxide.

Description

Decorative film {DECORATIVE FILM}

The invention relates to a decorative film.

The decorative film is a surface finishing material that can provide various decorative effects such as pictures, letters, numbers, patterns, and three-dimensional effects to interior and exterior materials of buildings, interior and exterior materials for automobiles, interior and exterior materials of electronic products, and the like.

For decoration of the decorative film, it is common to form a decorative layer directly on the transparent resin layer or to form a metal deposition layer directly on the transparent resin layer.

The decorative film obtained by the conventional method of directly forming the decorative layer on the transparent resin layer has a limit in making the transparent resin layer and the decorative layer appear deep.

In addition, the decorative film obtained by the conventional method of directly forming the metal deposition layer on the transparent resin layer, due to the low light transmittance of the metal, it was difficult to satisfy the glossiness peculiar to the metal and visibility of the decorative layer at the same time.

The present invention is to provide a decorative film that can solve the problems of the conventional method described above.

The present invention is to provide a decorative film that can make a deep visible between the transparent resin layer and the decorative layer, and can simultaneously provide glossiness and visibility of the decorative layer.

The problem to be solved by the present invention is not limited to those mentioned above, and the problems not mentioned will be clearly understood by those skilled in the art from the following description.

Decorative film according to the invention comprises a transparent film and a decorative layer. The transparent film includes a transparent resin layer and a transparent metal oxide layer, and the transparent metal oxide layer is disposed on the transparent resin layer. The decorative layer is disposed on the transparent metal oxide layer. The transparent metal oxide layer is disposed between the transparent resin layer and the decorative layer.

The transparent metal oxide layer is made of a metal oxide having a refractive index of 1.7 to 2.4, and the metal oxide having a refractive index of 1.7 to 2.4 is any one selected from the group consisting of transition metal oxide, post-transition metal oxide, and combinations thereof.

The transparent film satisfies the following (1) and (2).

(1) The absolute value of the (R1-R2) / R1 ratio is 0.01 to 2.0. At this time, R1 is the reflectance of the transparent resin layer, R2 is the reflectance of the transparent film, (R1-R2) is the difference between the reflectance of the transparent resin layer and the reflectance of the transparent film. The (R1-R2) / R1 ratio is a value obtained by dividing (R1-R2) by R1.

(2) In the graph of the function y = f (x) of the visible light wavelength band (x) and the reflectance (y) of the transparent film, there are four or less points with f '(x) = 0. The visible light wavelength band refers to a wavelength band of 360nm to 740nm.

Specific details of other embodiments are included in the detailed description and the drawings.

The invention can provide a decorative film which can make the transparent resin layer and the decorative layer visible deeply. Specifically, the invention is by placing a transparent metal oxide layer made of a high refractive index metal oxide between the decorative layer and the transparent resin layer, when the observer observes the decorative film from the top of the transparent resin layer, the decorative layer and transparent to the observer A sense of depth such as a glass film interposed between the resin layers can be provided.

The invention can provide a decorative film that satisfies the glossiness and visibility of the decorative layer at the same time. Specifically, the invention can arrange the transparent metal oxide layer between the transparent resin layer and the decorative layer, thereby providing the viewer with visibility of the decorative layer when the observer observes the decorative film from above the transparent resin layer. In addition, the invention controls the difference between the reflectance of the transparent resin layer and the reflectance of the transparent film in the visible light wavelength band (wavelength range of 360nm to 740nm), so that when the observer observes the decorative film from above the transparent resin layer, Can be provided.

The present invention can improve the moiré phenomenon by controlling the pattern of the reflectance graph of the transparent film in the visible light wavelength band (wavelength band of 360 nm to 740 nm), so that when the observer observes the decorative film from above the transparent resin layer, It can provide a sense of depth, gloss, visibility of the decorative layer, and excellent design quality.

The effects according to the invention are not limited by the contents exemplified above, and more various effects are included in the present specification.

1 is a schematic cross-sectional view of a decorative film according to an embodiment.
2 to 6 show reflectance graphs of the first film in the visible light wavelength band (wavelength band of 360 nm to 740 nm).
2 relates to a first film provided with a transparent titanium pentoxide (Ti ₃ O ₅ ) layer.
3 relates to a first film having a transparent niobium oxide (Nb ₂ O ₅ ) layer.
4 and 5 relate to a first film provided with a transparent aluminum oxide (Al ₂ O ₃ ) layer, respectively.
6 relates to a first film having a transparent tin oxide (SnO) layer.
7 is a schematic cross-sectional view of a decorative film according to another embodiment.
8 is a schematic cross-sectional view of a decorative film according to another embodiment.

Advantages and features of the present invention, and a method of accomplishing the same will be apparent with reference to the embodiments and experimental examples described below in detail together with the accompanying drawings. It is to be noted that the accompanying drawings are only for easily understanding the spirit of the technology disclosed in the present specification and are not to be construed as limiting the spirit of the technology by the accompanying drawings.

In addition, the invention is not limited to the contents disclosed below but may be embodied in various forms, the contents disclosed below to complete the disclosure of the invention, the invention to those skilled in the art to which the invention belongs It is provided to fully inform the scope of the invention, and the invention is only defined by the scope of the claims.

If it is determined that the detailed description of the related known technology may obscure the gist of the technology, the detailed description may be omitted.

Like reference numerals refer to like elements throughout. In the drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity.

Although the first, second, etc. are used to describe various components, these components are of course not limited by these terms. These terms are only used to distinguish one component from other components, and unless the description clearly indicates otherwise, the first component may be the second component.

Throughout the specification, unless otherwise stated, each component may be singular or plural.

Throughout the specification, when a part is referred to as "including", "having" a certain component, this is not to exclude other components, except to describe other components unless specifically stated otherwise It means you can include.

Throughout the specification, when referred to as "A and / or B", unless otherwise stated, means A, B or A and B, and when referred to as "C to D", this means that Unless otherwise, it means more than C and less than D.

When elements or layers are referred to as "on" or "on" of another element or layer, intervening other elements or layers as well as intervening another layer or element in between It includes everything. On the other hand, when a device is referred to as "directly on" or "directly on" indicates that no device or layer is intervened in the middle.

The spatially relative terms " below ", " beneath ", " lower ", " above ", " upper " It may be used to easily describe the correlation of a device or components with other devices or components. Spatially relative terms are to be understood as including terms in different directions of the device in use or operation in addition to the directions shown in the figures.

Hereinafter, with reference to the drawings, the invention will be described in more detail.

1 is a schematic cross-sectional view of a decorative film 100 according to an embodiment.

Referring to FIG. 1, the decorative film 100 includes a first film 110 and a decoration layer 120. The first film 110 includes a transparent resin layer 111 and a transparent metal oxide layer 112. The decoration layer 120 is disposed on the transparent metal oxide layer 112. In other words, the transparent metal oxide layer 112 is disposed between the transparent resin layer 111 and the decoration layer 120.

The decorative film 100 may further include a base layer 130. The decoration layer 120 is disposed on the base layer 130. In other words, the decoration layer 120 is disposed between the first film 110 and the base layer 130.

The first film 110 is a transparent film having a structure in which the transparent metal oxide layer 112 is disposed directly on the transparent resin layer 111, and the observer places the decorative film 100 on the transparent resin layer 111. When observing, the observer can visually recognize the decorative layer 120 disposed under the first film 110. The first film 110 has an optical density (OD) of less than 0.1 at a wavelength of 580 nm.

The decorative film 100 has a structure in which the transparent metal oxide layer 112 is disposed between the transparent resin layer 111 and the decorative layer 120, and the first film 110 has the following (1) and (2) Satisfies.

The inventors have compared the difference in reflectance between the transparent resin layer 111 and the first film 110 in the visible light wavelength band (wavelength band of 360 nm to 740 nm) and the first film 110 in the visible light wavelength band (wavelength band of 360 nm to 740 nm). By controlling the pattern of the reflectance graph of the, when the observer observes the decorative film 100 from the top of the transparent resin layer 111, the decorative film excellent in the glossiness, visibility of the decorative layer 120 and design quality to the observer 100 could be obtained.

 (1) The absolute value of the (R1-R2) / R1 ratio is 0.01 to 2.0. In this case, R1 is a reflectance of the transparent resin layer 111, R2 is a reflectance of the first film 110, (R1-R2) is a reflectance of the transparent resin layer 111 and the reflectance of the first film 110. Is the difference. The (R1-R2) / R1 ratio is a value obtained by dividing (R1-R2) by R1.

When the absolute value of the (R1-R2) / R1 ratio is more than 0.01 to 2.0, the increase in reflectance of the first film 110 is insignificant compared to the transparent resin layer 111, so that the decorative film 100 may realize a glossiness. It is difficult.

(2) In the graph of the function y = f (x) of the visible light wavelength band x and the reflectance y of the first film 110, f '(x) = 0 is four or less. The visible light wavelength band refers to a wavelength band of 360nm to 740nm. f '(x) is the derivative of f (x). A point with f '(x) = 0 means a point at which y = f (x) has a slope of 0, that is, a point with f' (x) = 0 has a slope of any tangent at that point with 0 Means to be.

When more than four points having f '(x) = 0, a moire phenomenon occurs in the first film 110. The moiré phenomenon degrades the design quality of the decorative film 100 by impairing the visibility of the decorative layer 120, and thus, in order to prevent occurrence of the moiré phenomenon in the first film 110, a point f '(x) = 0 Should be controlled to no more than four. By controlling the point at which f '(x) = 0 is 4 or less, the invention can suppress the occurrence of moiré phenomenon to provide the decorative film 100 having improved visibility of the decorative layer 120 and improved design quality. have.

The transparent resin layer 111 may be made of a transparent synthetic resin having a higher refractive index than air. The transparent resin layer 111 may be formed of, for example, a transparent synthetic resin film having a refractive index greater than 1.3 and less than 1.7. Examples of the transparent synthetic resin may include a polyester resin film, a polyolefin resin film, a polyamide resin film, and a poly resin. And acrylate resin films, thermoplastic polyurethane resin films, polycarbonate resin films, and ABS (Acrylonitrile-Butadiene-Styrene) resin films. Examples of the polyester resin film may include a polyethylene terephthalate (PET) resin film, and examples of the polyamide resin film may include a nylon resin film.

The thickness of the transparent resin layer 111 may be, for example, about 10 μm to about 100 μm. When the thickness of the transparent resin layer 111 is less than about 10 μm, the processability and handleability of the first film 110 are disadvantageous, and when the thickness of the transparent resin layer 111 is greater than about 100 μm, the thickness of the decorative film 100 is increased. Price competitiveness may deteriorate. For the above reason, the thickness of the transparent resin layer 111 may be, for example, about 20 μm to about 80 μm.

The transparent metal oxide layer 112 is made of a metal oxide having a higher refractive index than the transparent resin layer 111. The transparent metal oxide layer 112 may be obtained using a sputtering method or a thermal evaporation method.

Light incident on the transparent metal oxide layer 112 via the transparent resin layer 111 passes through an interface between the transparent resin layer 111 and the transparent metal oxide layer 112, and the direction of travel changes, and the transparent resin layer 111 ) By the refraction of light at the interface between the transparent metal oxide layer 112 and the decorative film 100, the decorative layer 120 disposed below the first film 110 is formed inside the first film 110. Can express the three-dimensional feeling like floating on.

Therefore, when the observer observes the decorative film 100 from above the transparent resin layer 111, the decorative film 100 is provided to the observer with a glass film interposed between the decorative layer 120 and the transparent resin layer 111 It can provide the same sense of depth.

The transparent metal oxide layer 112 may be made of a metal oxide having a refractive index of 1.7 to 2.4. The metal oxide having a refractive index of 1.7 to 2.4 is any one selected from the group consisting of transition metal oxides, post transition metal oxides, and combinations thereof. For example, metal oxides with refractive indices of 1.7 to 2.4 are AlxOy (0 <x <3, 0 <y <4), TixOy (0 <x <4, 0 <y <6), SnxOy (0 <x <4 , 0 <y <5) and NbxOy (0 <x <3, 0 <y <6).

According to the inventors, when the transparent metal oxide layer 112 is made of a metal oxide having a refractive index of 2.0 to 2.4, the reflectance R2 of the first film 110 in the entire visible wavelength range (wavelength range of 360 nm to 740 nm) It was larger than the reflectance R1 of this transparent resin layer 111. In addition, according to the inventors, when the transparent metal oxide layer 112 is made of a metal oxide having a refractive index of 2.0 to 2.4, the absolute value of (R1-R2) is that the transparent metal oxide layer 112 has a refractive index of 1.7 or more and 2.0. Compared with the case where the metal oxide is less than, the glossiness of the decorative film 100 was high.

In order to increase the glossiness of the decorative film 100, the transparent metal oxide layer 112 may be made of a metal oxide having a refractive index of 2.0 to 2.4. The metal oxide having a refractive index of 2.0 to 2.4 is any one selected from the group consisting of transition metal oxides, post-transition metal oxides, and combinations thereof. For example, metal oxides with refractive indices of 2.0 to 2.4 include TixOy (0 <x <4, 0 <y <6), SnxOy (0 <x <4, 0 <y <5) and NbxOy (0 <x <3 , 0 <y <6).

When the transparent metal oxide layer 112 is formed of a metal oxide having a refractive index of 2.0 to 2.4, the first film 110 may have a reflectance (R2) of the first film 110 in the entire visible wavelength range (wavelength range of 360 nm to 740 nm). ) Is larger than the reflectance R1 of the transparent resin layer 111, the absolute value of the (R1-R2) / R1 ratio is 0.04 to 2.0, and f '(x) = 0 can be satisfied that four or less points. .

Meanwhile, the thickness of the transparent metal oxide layer 112 may be about 5 nm to about 100 nm. When the thickness of the transparent metal oxide layer 112 was greater than about 100 nm, the wave property became large and f '(x) = 0 exceeded four points.

According to the inventors, the first film 110 made of a metal oxide having a refractive index of 2.0 to 2.4 and having a transparent metal oxide layer 112 having a thickness of about 10 nm to about 80 nm has a refractive index of 2.0 to 2.4. Compared to the first film 110 made of phosphorus metal oxide and provided with a transparent metal oxide layer 112 having a thickness of less than about 10 nm, the decorative film 100 provided high glossiness.

In order to provide a high gloss decorative film 100, the thickness of the transparent metal oxide layer 112 may be about 10 nm to about 80 nm, the transparent metal oxide layer 112 is a metal oxide having a refractive index of 2.0 to 2.4 It may be made of. In this case, the reflectance of the transparent metal oxide layer 112 is greater than that of the transparent resin layer 111 in the entire region of the visible light wavelength band (the wavelength band of 360 nm to 740 nm), and (R1-R2). It can be satisfied that the absolute value of the / R1 ratio is 0.1 to 2.0, and four or less points having f '(x) = 0.

As described above, when the reflectance graph of the transparent film in the visible light wavelength band (wavelength band of 360nm to 740nm) has a wave property, the moiré phenomenon may occur. In order to further reduce the occurrence of moiré phenomenon and to obtain the decorative film 100 having high glossiness, the first film 110 has a reflectance of the first film 110 in the entire visible wavelength range (wavelength range of 360 nm to 740 nm). R2) is larger than the reflectance R1 of the transparent resin layer 111, the absolute value of the (R1-R2) / R1 ratio is 0.10 to 2.0, and two points or less where f '(x) = 0 is preferable. Can satisfy one individual.

The decoration layer 120 may be a printing layer and / or a metal texture layer.

The print layer may have color and / or pattern. The print layer may serve to impart aesthetics to the decorative film 100 through color and / or pattern.

The print layer may be a colored layer or a transparent layer. The composition, printing method and the like of the ink for forming the colored layer are not particularly limited. For example, using one or two or more mixed printing inks or paints such as acrylic, vinyl chloride-vinyl acetate copolymer, urethane, polyester, fibrin derivative, chlorinated polypropylene, polyvinyl butyral, etc. A colored layer can be formed. Patterns may be formed on the printed layer in various ways such as transfer printing, gravure printing, screen printing, offset printing, rotary printing, or flexographic printing.

The metal texture layer may serve to impart a metal texture to the decorative film 100. The metal texture layer may be obtained by depositing a metal material on the transparent metal oxide layer 112 by sputtering, thermal deposition, or the like. Tin, aluminum, copper, silver, platinum, chromium, nickel, or an alloy thereof may be used as the metal material for forming the metal texture layer.

When the decorative layer 120 includes both the print layer and the metal texture layer, the print layer may be formed on the metal texture layer. In other words, when the decoration layer 120 includes both the print layer and the metal texture layer, the decoration film 100 may have a structure in which the metal texture layer is interposed between the transparent metal oxide layer 112 and the print layer. have.

The decoration layer 120 may have a thickness of about 5 nm to about 10 μm. The decoration layer 120 may be formed of a metal texture layer, or may include a laminated structure of the metal texture layer and the print layer. In this case, the thickness of the metal texture layer may be about 5 nm to about 100 nm.

The decorative layer 120 may be formed of a printed layer, or may include a laminated structure of a printed layer and a metal texture layer. In this case, the thickness of the printed layer may be about 0.1 μm to about 10 μm. By maintaining the thickness of the print layer in the above range, the decorative film 100 can implement a precise printing effect, it is possible to increase the workability and productivity by ensuring dryness.

The base layer 130 may be formed of a thermoplastic resin film, for example, a polyester resin film, a polyolefin resin film, a polyamide resin film, a polyacrylate resin film, a thermoplastic polyurethane resin film, or a polycarbonate. It may be made of a resin film, ABS (Acrylonitrile-Butadiene-Styrene) resin film, polyvinyl chloride film and the like. The substrate layer 130 may have a thickness of about 10 μm to about 100 μm. When the thickness of the base layer 130 is less than about 10 μm, workability and handleability are disadvantageous, and when the thickness of the base layer 130 is more than about 100 μm, the manufacturing cost of the decorative film 100 may be increased.

A decorative film was prepared using the transparent film obtained in Examples 1 to 9 below. The decorative layer was formed on the transparent metal oxide layer.

Example 1

A transparent film in which a transparent Ti ₃ O ₅ layer having a thickness of 5 nm was deposited on a transparent polyethylene terephthalate (PET) film (Toray Advanced Materials, XM30, 25 μm) was prepared.

-Evaporation Equipment: UNIVAC-800

Deposition Source: Ti ₃ O ₅

-Degree of vacuum: 8.0 × 10 ^-5 Torr

Example 2

A transparent film was manufactured in the same manner as in Example 1, except that a transparent Ti ₃ O ₅ layer having a thickness of 10 nm was deposited on the transparent PET film.

Example 3

A transparent film was manufactured in the same manner as in Example 1, except that a transparent Ti ₃ O ₅ layer having a thickness of 15 nm was deposited on the transparent PET film.

Example 4

A transparent film was prepared in the same manner as in Example 1 except that a 50 nm thick transparent Ti ₃ O ₅ layer was deposited on the transparent PET film.

Example 5

A transparent film was prepared in the same manner as in Example 1 except that a 100 nm thick transparent Ti ₃ O ₅ layer was deposited on the transparent PET film.

Example 6

A transparent film on which a transparent Nb ₂ O ₅ layer having a thickness of 80 nm was deposited on a transparent polyethylene terephthalate (PET) film (Toray Advanced Materials, XM30, 25 μm) was prepared.

-Evaporation Equipment: UNIVAC-800

Deposition source: Nb ₂ O ₅

-Degree of vacuum: 8.0 × 10 ^-5 Torr

Example 7

A transparent film in which a transparent Al ₂ O ₃ layer having a thickness of 30 nm was deposited on a transparent polyethylene terephthalate (PET) film (Toray Advanced Materials, XM30, 25 μm) was prepared.

-Evaporation Equipment: UNIVAC-800

Deposition Source: Al ₂ O ₃

-Degree of vacuum: 8.0 × 10 ^-5 Torr

Example 8

A transparent film was manufactured in the same manner as in Example 7, except that a transparent Al ₂ O ₃ layer having a thickness of 15 nm was deposited on the transparent PET film.

Example 9

Transparent SnO having a thickness of 50 nm on a transparent polyethylene terephthalate (PET) film (Toray Advanced Materials, XM30, 25 μm) A transparent film on which a layer was deposited was prepared.

-Evaporation Equipment: UNIVAC-800

Deposition source: Nb ₂ O ₅

-Degree of vacuum: 8.0 × 10 ^-5 Torr

Comparative Example 1

A transparent film was prepared in the same manner as in Example 1 except that a 300 nm thick transparent Ti ₃ O ₅ layer was deposited on the transparent PET film.

Comparative Example 2

On the transparent polyethylene terephthalate (PET) film (Toray Advanced Materials, XM30, 25 µm), a metal deposition film was formed on which an aluminum deposition layer having an O.D. value of 0.6 was formed.

-Evaporation Equipment: UNIVAC-800

Evaporation source: aluminum (Al)

-Degree of vacuum: 8.0 × 10 ^-5 Torr

Comparative Example 3

A metal deposition film was prepared in the same manner as in Comparative Example 2 except that an aluminum deposition layer having an O.D. value of 0.4 was deposited on a PET film.

Experiment method

Reflectance and Color Difference Values

Using the CM-5 (Konica Minolta Co., Ltd.), the reflectance and color difference values in the visible region were measured for the films obtained in Examples and Comparative Examples. The reflectance was measured in the direction of the transparent resin layer (PET film).

Optical Density (O.D.)

301x (X-lite) was used for the films obtained in Examples and Comparative Examples. The value was measured.

2 through 6 illustrate graphs of reflectances of the first film 110 in the visible light wavelength band (the wavelength band of 360 nm to 740 nm).

FIG. 2 relates to a first film 110 provided with a transparent titanium pentoxide (Ti ₃ O ₅ , refractive index 2.15) layer, and FIG. 3 illustrates a first provided with a transparent niobium oxide (Nb ₂ O ₅ , refractive index 2.34) layer. 4 and 5 are directed to a first film 110 provided with a transparent aluminum oxide (Al ₂ O ₃ , refractive index 1.77) layer, respectively. FIG. 6 relates to a first film 110 provided with a transparent tin oxide (SnO) layer having a refractive index of 2.01.

2 to 6 show graphs of reflectances of the transparent resin layer 111 in the visible light wavelength band (wavelength bands of 360 nm to 740 nm), and in FIGS. The layer 112 is made of Ti ₃ O ₅ , which means that the thickness of the transparent metal oxide layer 112 is 5 nm, and BHL and bare PET are pure transparent water in which the transparent metal oxide layer 112 is not formed, respectively. It means the strata 111.

Table 1 summarizes the numbers of R1, R2, (R1-R2), (R1-R2) / R1 ratio and f '(x) = 0 in FIGS. In Table 1, the first film 110 of FIG. 2 is labeled A (Ti ₃ O ₅ ), the first film 110 of FIG. 3 is labeled B (Nb ₂ O ₅ ), and the agent of FIG. 1 film 110 is referred to as C (Al ₂ O ₃ ), the first film 110 of FIG. 5 is referred to as D (Al ₂ O ₃ ), the first film 110 of FIG. SnO).

In Table 1, PET refers to a polyethylene terephthalate film used as the transparent resin layer 111 of the first film 110 of FIGS. In Table 1, the MOx thickness means the thickness of the transparent metal oxide layer 112.

MOx thickness (nm) R1
(unit %) R2
(unit %) (R1-R2) (R1-R2) / R1 ratio the number of points with f '(x) = 0 PET N / A 11.04 N / A N / A N / A N / A A (Ti ₃ O ₅ ) 5 N / A 11.44 -0.4 -0.04 One 10 N / A 12.12 -1.08 -0.10 One 15 N / A 12.95 -1.91 -0.17 One 50 N / A 20.54 -9.5 -0.86 One 100 N / A 10.95 0.09 0.01 2 300 N / A 17.17 -6.13 -0.56 5 B (Nb ₂ O ₅ ) 80 N / A 13.52 -2.48 -0.22 2 C (Al ₂ O ₃ ) 30 N / A 10.6 0.44 0.04 2 D (Al ₂ O ₃ ) 15 N / A 11.4 -0.36 -0.03 2 E (SnO) 50 N / A 20.15 -0.91 -0.83 One

Referring to FIGS. 2 to 6 together with Table 1, in Table 1, in the case of A (Ti ₃ O ₅ ) having a MOx thickness of 300 nm, in other words, Ti ₃ O 5_300 nm of FIG. 2 is f ′ (x) = 0. The number of points is five.

2 shows that the reflectance increases as the thickness of the transparent metal oxide layer 112 increases. However, when the thickness of the transparent metal oxide layer 112 increases, a wavelength band having a reflectance smaller than that of BHL, such as Ti 3 O 5 —100 nm, is shown.

Referring to FIG. 2, Ti3O5_5nm, Ti3O5_10nm, Ti3O5_15nm, Ti3O5_50 nm have a higher reflectance compared to BHL in the entire visible wavelength range (wavelength range of 360nm to 740nm), and show that one point is f '(x) = 0. Can be. In particular, among the Ti3O5_5nm, Ti3O5_10nm, Ti3O5_15nm, Ti3O5_50 nm, Ti3O5_50 nm has a higher reflectance than BHL in the entire visible wavelength range (wavelength range of 360 nm to 740 nm) and has one point of f '(x) = 0, and one of BHL The difference with the reflectance was the largest.

Referring to FIG. 3, it can be seen that Nb 2 O 5 — 80 nm has higher reflectance than BHL in all visible light wavelength bands (wavelength bands of 360 nm to 740 nm), and two points having f ′ (x) = 0.

4 and 5 are graphs of reflectance of the first film 110 having the transparent metal oxide layer 112 made of a metal oxide having a refractive index of less than 2.0, wherein Al 2 O 3 — 30 nm and Al 2 O 3 — 15 nm have a wavelength band having a reflectance smaller than that of bare PET. Shows.

FIG. 6 shows that SnO_50nm has a higher reflectance compared to BHL in the entire visible wavelength range (wavelength of 360nm to 740nm), one point of f '(x) = 0, and a graph form similar to Ti3O5_50nm.

As confirmed by the inventors, even when the absolute value of the (R1-R2) / R1 ratio satisfies 0.01 to 2.0, the graph of the reflectance with respect to the visible wavelength is as f '(x) = 0, as in Ti3O5_300nm of FIG. In the case where the phosphorus point shows a wave characteristic exceeding four and the wavelength becomes shorter toward the short wavelength, the moiré phenomenon occurs in the first film 110 and the design quality of the decorative film 100 is impaired.

Ti3O5_5nm, Ti3O5_10nm, Ti3O5_15nm, Ti3O5_50 nm, Ti3O5_100 nm, SnO_50nm and Nb2O5_80nm had two or less points of f '(x) = 0 with respect to visible wavelength, and the reflectance measurement value was higher than that of BHL. According to the inventors, the moiety of Ti3O5_5nm, Ti3O5_10nm, Ti3O5_15nm, Ti3O5_50 nm, Ti3O5_100 nm, SnO_50nm, and Nb2O5_80nm was prevented, and the visibility of the decorative layer was superior to Ti3O5_300nm.

However, Ti3O5_100 nm had lower glossiness than Ti3O5_5nm, Ti3O5_10nm, Ti3O5_15nm, Ti3O5_50 nm, SnO_50nm, and Nb2O5_80nm.

Al2O3_30nm and Al2O3_15nm have two or less points where f '(x) = 0 is a graph of reflectance versus visible wavelength, and reflectance measurements are lower than those of BHL. According to the inventors, Al2O3_30nm and Al2O3_15nm prevented moiré, and the visibility of the decorative layer was superior to Ti3O5_300nm, but was lower than Ti3O5_5nm, Ti3O5_10nm, Ti3O5_15nm, Ti3O5_50 nm, SnO_50nm, and Nb2O5_80nm.

Table 2 summarizes the results of comparison with the metal deposited film. In Table 2, the metal deposition film is designated as MDF. Table 3 summarizes the results of comparison with the metal deposited film. In Table 3, the metal deposition film is designated as MDF.

OD MDF Semi-Deposition 0.4 MDF complete deposition 0.6 SnO_50nm 0.02

Y (D65) L ^* (D65) a ^* (D65) b ^* (D65) MDF Semi-Deposition 20.4 52.29 -0.6 0.11 MDF complete deposition 42.98 71.54 -0.79 0.88 SnO_50nm 20.15 52.01 -1.76 -4.26

Referring to Table 3, SnO_50nm showed similar reflectance as MDF semi-deposition. The reflectance (Y (D65)) of SnO_50nm was 20.15, and the reflectance (Y (D65)) of MDF semi-deposition was 20.4. SnO_50nm provided the decorative film 100 with a metallic luster.

Referring to Table 2, O.D. of SnO 50 nm. The value is 0.02 and SnO_50 nm is lower in O.D. Value was shown. Referring to Table 2 and Table 3, SnO_50nm showed a reflectance similar to that of MDF semi-deposition, and was transparent compared to MDF semi-deposition. SnO_50nm provided the decorative film 100 with a metal-like gloss while being transparent compared to the metal deposition film.

7 is a schematic cross-sectional view of a decorative film 200 according to another embodiment. Hereinafter, only the difference between the decorative film 100 and the decorative film 200 will be described in detail, and the above description of the same configuration and the like will be omitted.

1 and 7, the second film 210 is different from the first film 110 in that the transparent design pattern layer 213 is included.

Referring to FIG. 7, the decorative film 200 includes a second film 210 and a decoration layer 120. The second film 210 includes a transparent resin layer 211, a transparent metal oxide layer 212, and a transparent design pattern layer 213 disposed between the transparent resin layer 211 and the transparent metal oxide layer 212. do. The design pattern layer 213 may provide a three-dimensional effect to the decorative film 200 to maximize the design effect.

O.D. at a wavelength of 580 nm of the second film 210. The value is less than 0.15, and at this point the O.D. It may differ from the value. The design pattern layer 213 is provided with a groove H, the groove H is filled with a transparent metal oxide layer 211, and the pattern of the design pattern layer 213 is used to form the O.D. Value of the first film 110. It may be larger than the value.

The decoration layer 120 is disposed on the transparent metal oxide layer 212. In other words, the transparent metal oxide layer 212 is disposed between the transparent resin layer 211 and the decorative layer 120.

The transparent design pattern layer 213 may include, for example, a 3D stereoscopic pattern, an embossing pattern, or the like, and may impart a stereoscopic feeling to the decorative film 200 through the 3D stereoscopic pattern, the embossing pattern, or the like. The transparent design pattern layer 213 may be manufactured by various methods, for example, may be manufactured using an imprinting technique.

The transparent design pattern layer 213 may have a thickness of, for example, about 1 μm to about 50 μm. When the thickness of the transparent design pattern layer 213 is less than about 1 μm, the three-dimensional appearance of the decorative film 200 is reduced, and when the thickness of the transparent design pattern layer 213 is greater than about 50 μm, the transparency of the decoration film 200 is reduced. And physical properties of the interlayer interfacial adhesion may be lowered.

8 is a schematic cross-sectional view of a decorative film 300 according to another embodiment. Hereinafter, only the difference between the decorative film 100 and the decorative film 300 will be described in detail, and the above description of the same configuration and the like will be omitted.

1 and 8, the third film 310 is different from the first film 110 in that it includes a hairline pattern.

Referring to FIG. 8, the decorative film 300 includes a third film 310 and a decoration layer 120. The third film 310 includes a transparent resin layer 311 and a transparent metal oxide layer 312. The transparent resin layer 311 has a hairline pattern, and the transparent metal oxide layer 312 has a corresponding pattern complementary to the hairline pattern of the transparent resin layer 311.

The hairline pattern may be, for example, a method of polishing the surface of the transparent resin layer 311 after uniformly attaching an abrasive to a nonwoven fabric or the like, or polishing the surface of the transparent resin layer 311 using sand paper. Can be obtained.

Although the embodiments have been described above with reference to the accompanying drawings, the invention is not limited to the above embodiments, but may be manufactured in various forms by combining the contents posted in each embodiment, and in the art to which the invention pertains. Those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the invention. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

100, 200, 300: decorative film
110: first film
210: second film
310: third film
111, 211, and 311: transparent resin layer
112, 212 and 312: transparent metal oxide layer
213: transparent design pattern layer
120: decorative layer
130: substrate layer

Claims (8)

A transparent film comprising a transparent resin layer and a transparent metal oxide layer disposed on the transparent resin layer; And
Includes; decorative layer disposed on the transparent metal oxide layer,
The transparent metal oxide layer is made of a metal oxide having a refractive index of 1.7 to 2.4,
The metal oxide having a refractive index of 1.7 to 2.4 is any one selected from the group consisting of transition metal oxides, post-transition metal oxides, and combinations thereof.
The transparent film is a decorative film satisfying the following (1) and (2):
(1) The absolute value of the ratio (R1-R2) / R1 is 0.01 to 2.0, wherein R1 is the reflectance of the transparent resin layer, R2 is the reflectance of the transparent film, and (R1-R2) is the transparent Is the difference between the reflectance of the resin layer and the reflectance of the transparent film,
(2) In the graph of the function y = f (x) of the visible light wavelength band (x) and the reflectance (y) of the transparent film, there are four or less points having f '(x) = 0, and the visible light wavelength band is 360 nm to It means the wavelength band of 740nm. According to claim 1,
The transparent metal oxide layer is made of a metal oxide having a refractive index of 2.0 to 2.4,
The metal oxide having a refractive index of 2.0 to 2.4 is any one selected from the group consisting of a transition metal oxide, a transition metal oxide, and a combination thereof. According to claim 1,
The transparent film is a first film having a structure in which the transparent metal oxide layer is directly disposed on the transparent resin layer,
The first film is a decorative film having an optical density (OD) of less than 0.1 at a wavelength of 580 nm. According to claim 1,
The transparent film is a second film further comprises a transparent design pattern layer disposed between the transparent resin layer and the transparent metal oxide layer, wherein the design pattern layer is provided with a groove, the groove The metal oxide layer is filled,
The second film is a decorative film having an optical density (OD) of less than 0.15 at a wavelength of 580 nm. According to claim 1,
Metal oxides having a refractive index of 1.7 to 2.4 include AlxOy (0 <x <3, 0 <y <4), TixOy (0 <x <4, 0 <y <6), and SnxOy (0 <x <4, 0 < The decorative film of any one of y <5) and NbxOy (0 <x <3, 0 <y <6). The method of claim 2,
The metal oxides having a refractive index of 2.0 to 2.4 include TixOy (0 <x <4, 0 <y <6), SnxOy (0 <x <4, 0 <y <5), and NbxOy (0 <x <3, 0 < The decorative film of any one of y <6). According to claim 1,
The transparent metal oxide layer has a thickness of 10 nm to 80 nm decorative film. According to claim 1,
In the entire visible wavelength range (360 nm to 740 nm), the reflectance (R2) of the transparent film is larger than the reflectance (R1) of the transparent resin layer,
The absolute value of the ratio (R1-R2) / R1 is 0.10 to 2.0,
The decorative film having one point where f '(x) = 0.

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