JP2003311865A - Laminated film and its lamination method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated film which is structured so as to prevent the gas barrier properties of a gas barrier layer, consisting of a vapor-deposited layer from being deteriorated and air bubbles from being generated in an adhesive sandwiching a coloring layer and an interface between base materials, especially in laminating films and best-suitably used in an optical field regarding a laminated film having the colored layer consisting of a printing ink, and the gas barrier layer consisting of the vapor-deposited layer. <P>SOLUTION: This laminated film with gas barrier properties is structured of at least a transparent vapor-deposited film layer, a printing base material layer having the colored layer consisting of the printing ink formed on the face, and a sealant film layer. The method for laminating the laminated film is provided. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated film having a colored layer made of a printing ink and having a gas barrier property, and particularly, in film lamination, deterioration of the gas barrier property or between film substrates sandwiching the colored layer. The present invention relates to a laminated film having a structure in which bubble generation is prevented. This laminated film is
It is preferably used for applications in the optical field.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, a vapor deposition layer 3 is provided on one side of a transparent film substrate 2 as a laminated film having a gas barrier property and including a colored layer made of a printing ink, and this vapor deposition is further performed. A transparent vapor deposition film layer 235 formed by directly printing a colored layer 5 made of a printing ink on the layer 3.
A laminated film 9 having a configuration in which an intermediate base material layer 4 and a sealant film layer 6 are laminated in this order via an adhesive layer 7.
In forming the colored layer 5 made of the printing ink on the surface of the vapor deposition layer 3, there was a problem that the solvent contained in the printing ink adversely affects the vapor deposition layer 3 and the gas barrier property is deteriorated.

As a measure to solve the above problems, as shown in FIG. 4, a colored layer 5 made of printing ink is provided on the intermediate substrate 4.
And the transparent deposition film layer 23, the intermediate base material layer 45, and the sealant film layer 6 in this order.
The vapor-deposited layer 3 provided on the transparent vapor-deposited film layer 23 is configured by forming the laminated film 10 in which the colored layer 5 and the sealant film layer 6 are laminated so as to face each other with the adhesive layer 7 provided on the front and back sides thereof. Although the problem of the deterioration of the gas barrier property is solved, in such a configuration, the configuration of the circular region A portion of the laminated film 10 is enlarged and as shown in FIG.
Coloring layer 5 made of printing ink and sealant film layer 6
There is a problem that fine bubbles 11 are generated at each interface when laminating via the adhesive layer 7 because the surface of the film has fine irregularities, and the obtained laminated film can be practically used for optical applications. I didn't get anything.

Further, as shown in FIG. 5, a transparent vapor deposition film layer 23 in which a vapor deposition layer 3 is provided on a transparent film substrate 2, an intermediate substrate layer 45 in which a colored layer 5 is provided on the intermediate substrate 4, The sealant film layer 6 is laminated in this order so that the vapor deposition layer 3 provided on the transparent vapor deposition film layer 23 and the colored layer 5 face each other, for example, have transparency for optical use and are contained in an adhesive or the like. Adhesive 1 whose components do not affect the vapor deposition layer 3
Laminated film 1 in which an adhesive 13 is formed and laminated on the vapor deposition layer 3 provided on the transparent vapor deposition film layer 23 using
With the configuration of 2, it is possible to prevent deterioration of the gas barrier property, but since the surface of the adhesive layer 13 and the surface of the colored layer 5 made of printing ink have fine irregularities, the circle of the laminated film 12 is 5 is an enlarged view of the configuration of the region B in FIG.
As shown in (b), the surface of the adhesive layer 13 and the surface of the colored layer 5 made of printing ink have fine irregularities, and the adhesive layer 13
There is a problem that fine bubbles 11 are generated at the interface when the and the colored layer 5 are laminated, and the obtained laminated film could not be practically used for optical applications.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and particularly in a laminated film having a colored layer made of a printing ink and a gas barrier layer made of a vapor deposition layer, To provide a laminated film suitable for use in the optical field, which is configured to prevent deterioration of gas barrier properties of a gas barrier layer formed of a vapor deposition layer and generation of bubbles at an interface between base materials and an adhesive agent when a film is laminated. Is an issue.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 provides at least a transparent vapor-deposited film layer and a printing substrate layer having a colored layer made of printing ink on the surface thereof. A laminated film having a gas barrier property including a sealant film layer.

According to a second aspect of the present invention, in the laminated film according to the first aspect, at least a transparent vapor deposition film layer, a printing substrate layer having a colored layer made of a printing ink provided on the surface, and a sealant film layer. A laminated film laminated in this order, characterized in that it is laminated so that the vapor-deposited surface of the transparent vapor-deposited film layer and the colored surface made of printing ink of the printing substrate layer face each other.

According to a third aspect of the present invention, in the laminated film according to the first aspect, at least a printing substrate layer having a colored layer made of a printing ink on a surface thereof, a transparent vapor deposition film layer, and a sealant film layer. A laminated film laminated in this order, characterized in that it is laminated so that the colored surface of the printing substrate layer made of printing ink and the vapor deposition surface of the transparent vapor deposition film layer face each other.

According to a fourth aspect of the present invention, in the laminated film according to the first aspect, an adhesive layer having a light-transmitting property is formed on the surface of a colored layer made of a printing ink provided on the surface of a printing base material layer to form a laminate. A method for laminating a laminated film, comprising at least the step of:

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment as a preferred embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an example of the structure of the laminated film of the present invention. Further, FIG. 2 is a schematic sectional view showing another example of the constitution of the laminated film of the present invention. As shown in FIG. 1, the laminated film 1 of the present invention includes, for example, at least a transparent vapor deposition film layer 23 having a vapor deposition layer 3 formed on one surface of a transparent film substrate 2 and a printing substrate 4 colored with a printing ink. A printing base material layer 45 having a colored layer provided on the surface thereof and a sealant film layer 6 are laminated in this order, and an adhesive is provided on the surface of the colored base material 5 provided on the surface of the printing base material layer 45. It is a laminated film in which the layer 7 is formed and laminated so that the surface of the vapor-deposited layer 3 of the transparent vapor-deposited film layer 23 and the surface of the colored layer 5 made of the printing ink of the printing base material layer 45 face each other. The adhesive layer 7 between the base material surface of the printing base material layer 45 and the sealant film layer 6 is
It is desirable to form it on the surface of the base material layer 4 of the print base material layer 45, but it is not particularly limited.

The laminated film of the present invention has another constitutional example, for example, as shown in FIG.
Is at least a printing substrate layer 45 having a colored layer in which a coloring layer 5 made of a printing ink is provided on the printing substrate 4, and a transparent vapor deposition film layer 23 in which the vapor deposition layer 3 is formed on one surface of the transparent film substrate 2. , The sealant film layer 6 are laminated in this order, the adhesive layer 7 is formed on the surface of the colored layer 5 provided on the surface of the printing substrate layer 45, and the vapor deposition layer 3 of the transparent vapor deposition film layer 23 is formed. It is a laminated film in which the surface and the surface of the colored layer 5 made of the printing ink of the printing base material layer 45 are laminated so as to face each other. The adhesive layer 7 between the base material layer 2 surface of the transparent vapor deposition film layer 23 and the sealant film layer 6 is preferably formed on the base material layer 2 surface of the transparent vapor deposition film layer 23, but is not particularly limited.

The laminated film of the present invention is constructed as described above, and by adopting the laminating method of forming the adhesive layer 7 on the surface of the colored layer 5 provided on the surface of the printing substrate layer 45,
It is possible to prevent the problem of deterioration of the gas barrier property of the gas barrier layer formed of the vapor deposition layer and the generation of bubbles at the interface between the adhesive layer and the base material sandwiching the colored layer.

Examples of the material of the transparent film substrate 2 of the transparent vapor deposition film layer 23 used in the present invention include high density polyethylene, medium density polyethylene, low density polyethylene, linear (linear) low density polyethylene, and others. Polyethylene resin, polypropylene resin, polystyrene resin, polyacrylonitrile resin, poly (meth) acrylic resin, polyester resin, polyamide resin, polyaramid resin, polycarbonate resin, polyacetal resin, etc. A resin film such as the above can be used. As the resin film as described above, an unstretched film or a uniaxially or biaxially stretched film can be used, and its thickness is optional, but is 6 to 100 μm.
It is desirable to use those having a position within the range of 7 to 30 μm.

As the adhesive 7 used in the present invention, an adhesive for dry lamination is preferably used.
As the adhesive for dry lamination, for example, one-component or two-component curing type (meth) acrylic type, polyamide type,
Polyester-based, polyether-based, polyurethane-based, epoxy-based, epoxy-based adhesives for laminating can be used. The coating method of the adhesive for lamination, for example, direct gravure coating method,
It can be applied by a method such as a gravure roll coating method, a kiss coating method or a reverse roll coating method. Further, for example, an adhesion promoter such as a silane coupling agent may be optionally added to the above-mentioned laminating adhesive.

The vapor-deposited layer 3 of the transparent vapor-deposited film layer 23 used in the present invention functions as a gas barrier layer against water vapor, oxygen and the like, and the level of this gas barrier property is appropriately set depending on the application and is not particularly limited. Not something. While ensuring stable gas barrier performance,
In order to suppress the secondary pollution due to disposal, Al is preferable,
Metals such as Si, Ti, Zn, Zr, Mg, Sn, Cu, and Fe, oxides and nitrides of these metals, more specifically, SiOx (x = 1.0 to 2.0), alumina, Magnesia, zinc sulfide, titania, zirconia, cerium oxide and the like can be used as a mixed vapor-deposited layer of two or more kinds or a vapor-deposited layer having a multi-layer structure, if necessary.

The preferable thickness of the above-mentioned inorganic vapor-deposited layer is usually in the range of 10 to 5000Å, more preferably 50 to 2000Å, and if the thickness is less than 10Å, it is difficult to obtain sufficient gas barrier properties, and if it exceeds 5000Å, it is excessive. Even if the thickness is increased, a further effect of improving the gas barrier property cannot be obtained, and it is rather disadvantageous in terms of bending resistance and manufacturing cost.

In forming the above-mentioned inorganic vapor deposition layer, a vacuum vapor deposition method, a sputtering method, a physical vapor deposition method such as an ion plating method, or a chemical vapor deposition method is appropriately selected and used. Preferred vapor deposition materials when the vacuum vapor deposition method is adopted are metals such as aluminum, silicon, titanium, magnesium, zirconium, cerium, and zinc, or SiO.
A compound such as x (x = 1.0 to 2.0), alumina, magnesia, zinc sulfide, titania, zirconia, or a mixture thereof is used, and the heating method includes resistance heating, induction heating, electron beam heating, and the like. Can be used. As the reaction gas, oxygen, nitrogen, hydrogen, argon, carbon dioxide,
Reactive vapor deposition may be used in which water vapor or the like is introduced, or means such as ozone addition and ion assist are used in combination. Furthermore,
A bias may be applied to the substrate, and film forming conditions such as heating and cooling of the substrate may be changed. The vapor deposition material, reaction gas, substrate bias, heating / cooling, etc., are sputtering methods or CV.
The same film forming condition can be changed when the D method is adopted.

In the present invention, various oxides and nitrides are listed as the main inorganic compound layer forming the gas barrier layer, but aluminum oxide and silicon oxide are mainly used from the viewpoint of productivity and performance. Those are the most preferred.

For forming the gas barrier layer made of aluminum oxide and / or silicon oxide, a vacuum deposition method using electron beam heating, induction heating, and resistance heating as evaporation means, as well as a sputtering method, a CVD method, and an ion plating method. A coating method or the like can be used, but from the viewpoint of productivity, a method of forming a film on a winding film using a vacuum vapor deposition method is preferable.

The thickness of the layer made of such an aluminum oxide and / or silicon oxide varies slightly depending on the composition of the layer, etc., but is in the range of 5 to 100 nm, more preferably in the range of 10 to 50 nm. There is. 5
If it is thinner than nm, it may not be a continuous layer, and conversely 1
This is because if it is thicker than 00 nm, cracks are likely to occur due to internal stress.

If necessary, an anchor coat layer may be applied to the transparent film substrate on the surface on which the vapor deposition layer is formed, or a corona treatment, a flame treatment, a low temperature plasma treatment, a glow discharge treatment, a reverse sputtering treatment before or during the vapor deposition. It is also effective to further increase the adhesion to the inorganic vapor deposition layer by subjecting it to a surface roughening treatment or the like.

Examples of the material of the printing substrate layer 4 used in the present invention include various polyethylene-based materials such as high density polyethylene, medium density polyethylene, low density polyethylene, linear (linear) low density polyethylene, and the like. Resin, polypropylene resin, polystyrene resin, polyacrylonitrile resin, poly (meth) acrylic resin, polyester resin, polyamide resin, polyaramid resin, polycarbonate resin, polyacetal resin, etc. Can be used. As the resin film as described above, unstretched,
Alternatively, a uniaxially or biaxially stretched film can be used, and the thickness thereof is arbitrary, but a film having a thickness within the range of 6 to 100 μm, and further within the range of 7 to 30 μm can be used. desirable.

Sealant layer 6 used in the present invention
As the material constituting the above, any resin having heat sealing property may be used, and polypropylene, polyethylene terephthalate, polyethylene and the like can be preferably used. The thickness of the sealant layer is 20 to obtain the necessary sealing strength.
It is preferable that the thickness is about 100 μm.

The colored layer 5 made of the printing ink in the laminated film of the present invention can change the function of the colored layer by selecting the material constituting the colored layer depending on the application of the laminated film. For example, a coloring layer having the above-mentioned various functions is provided by using a printing ink composed of a composition whose main component is a colorant or the like that imparts a light selective absorption function, an ultraviolet absorption function, a spectral transmittance adjustment function, and the like. A laminated film can be provided.

For example, as an example of the function of the laminated film of the present invention, the colored layer has a property of blocking at least light in the visible light region, or simultaneously blocks light outside the visible light region. It may be. At least 38
The photoselective absorber is selected so as to have an absorption wavelength region from 0 nm to 600 nm, but it may partially absorb light having a wavelength outside this range.

The photoselective absorber is, for example, a commonly used organic or inorganic dye or pigment. Specific examples thereof include nitroso type, nitro type, monoazo type, diazo type, diphenylmethane type, triphenylmethane type, xant type, azine type, triazine type, triazole type, quinoline type, indigo type, anthraquinone type,
Dyes and pigments such as phthalocyanine, nickel, cobalt,
Praseodymium, neodymium, samarium, europium,
Examples thereof include organic compounds such as dysprosium, holmium, and thulium, or salts thereof. These are appropriately selected in order to adjust the light transmittance in each wavelength band, and one kind or a combination of two or more kinds may be used.

As another example of the function of the laminated film of the present invention, a coloring layer for color correction which can be effectively used in a color display such as a cathode ray tube (CRT) or a plasma display as a flat display. It is possible to provide a laminated film including:

A color layer made of printing ink in which a color correction pigment is dispersed for color correction is formed. The pigment itself is
For example, in the case of a color plasma display, the color of green is strong, so that it selectively absorbs the green (preferably having a wavelength of 500 to 600 nm, particularly preferably having an absorption region at 520 nm). , Etc. are used to select those having spectral characteristics according to the required color correction. At that time, 400 to 500 nm and 6
It is preferable that the spectral transmittance is set to 45 to 75% over each wavelength range of 00 to 700 nm and the absorption maximum is set to the wavelength range of 500 to 600 nm. that way,
The green can be selectively absorbed, the black display on the display can be prevented from becoming whitish, and the contrast can be further improved.

As another example of the function of the laminated film of the present invention, a laminated film having an ultraviolet absorbing function can be provided. The ultraviolet absorber is not particularly limited as long as it is a material having an ultraviolet absorbing function, for example,
Benzophenone-based, triazole-based, hindered amine-based UV absorbers alone or mixed with a binder component or solvent component such as a synthetic resin to prepare a printing ink, by a known printing means such as a gravure printing method,
A colored layer is formed.

The ultraviolet absorbing layer may further contain a pigment. As the pigment, an inorganic pigment such as titanium oxide and an organic pigment such as phthalocyanine can be used. It is sufficient that the ultraviolet absorbing layer has a thickness capable of retaining the ultraviolet shielding property and other physical properties, and the thickness is preferably 0.5 to 50 μm, and particularly 0.5 to 5 μm.

As another function of the laminated film of the present invention, as another example, a light selective absorption having a light selective absorption coloring material that selectively absorbs external light in a color display device having blue, green and red pixels. A laminated film provided with a colored layer having properties can be provided. The filter of the photoselective absorptive laminated film can be applied to various color display devices such as CRTs, PDPs and liquid crystals.

Normally, blue, green and red pixels have emission spectrum peaks near 450 nm, 540 nm and 630 nm, respectively, but in the photoselective absorptive filter of the present invention, these emission peaks are observed. Since it has an absorption peak in the wavelength region between them, that is, in the wavelength region of 470 nm to 510 nm and in the wavelength region of 550 nm to 600 nm, the luminance of the light emitting pixel does not decrease, and the reflected light is highly efficient. It will be absorbed.

In the laminated film of the present invention, a gravure printing method is preferable as a printing method for forming a colored layer made of printing ink. The printing ink for forming the colored layer is a solvent-type ink material, that is, a coloring agent selected according to the function imparted to the coloring layer, that is, a dye or pigment, a resin as a binder, a solvent that dissolves it, or a coloring agent. The ink material is composed of a dispersant for dispersing.

The function of the laminated film of the present invention is not limited to the above-mentioned embodiment, and is suitably used for various optical fields such as optical filters depending on the function imparted to the colored layer.

The laminated film of the present invention has hitherto been described as a laminated film composed of a transparent vapor deposition film layer, a printing substrate layer and a sealant film layer, which has a gas barrier property and has a colored layer of a printing ink. By adopting a lamination method in which the adhesive layer is formed on the surface of the coloring layer provided on the surface of the printing base material layer, the deterioration of the gas barrier property as the gas barrier layer composed of the vapor deposition layer and the adhesion between the colored layers are adhered. A laminated film suitable for optical use can be obtained by using a structure in which bubbles are prevented from being generated at the interface between the agent and the film base material. Of course, it can be used not only for optical applications but also for packaging applications such as foods, electronic parts, and pharmaceuticals that require gas barrier properties.

[0036]

According to the present invention, at least a transparent vapor deposition film layer, a printing substrate layer having a colored layer made of a printing ink on the surface thereof, and a colored layer made of a printing ink having a sealant film layer are provided. And in a laminated film having gas barrier properties, especially when laminating films,
By adopting a lamination method of forming an adhesive layer on the surface of the colored layer provided on the surface of the printing substrate layer, deterioration of the gas barrier property of the gas barrier layer consisting of a vapor deposition layer and an adhesive layer or film substrate sandwiching the colored layer It is possible to provide a laminated film which is suitable for use in the optical field, such as various optical filters, in which bubbles are prevented from being generated at the interfacial interface. Further, the laminated film of the present invention can be used not only for applications in the optical field but also for packaging applications such as foods, electronic parts, and pharmaceuticals, which require gas barrier properties.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of the constitution of a laminated film of the present invention.

FIG. 2 is a schematic cross-sectional view showing another example of the constitution of the laminated film of the present invention.

FIG. 3 is a schematic cross-sectional view showing an example of the configuration of a conventional laminated film.

FIG. 4 shows another example of the structure of a conventional laminated film, and (a) is a schematic cross-sectional view of the structure of the laminated film. (B) is the circular area A shown in (a)
It is the schematic sectional drawing which expanded and showed the part.

FIG. 5 shows still another example of the structure of a conventional laminated film, and (a) is a schematic sectional view of the structure of the laminated film. (B) is an outline sectional view which expanded and showed the circular field B portion shown in (a).

[Explanation of symbols]

1, 8, 9, 10, 12, ... Laminated film 2 ... Transparent film substrate 3 ... Deposition layer 4 ... Printing substrate (intermediate substrate) 5 ... Colored layer 6 ... Sealant film layer 7 ... Adhesive layer 11 ... bubbles 13 ... Adhesive 23 ... Deposition transparent film layer 45 ... Colored printing base material layer 235 ... Vapor-deposited transparent film layer provided with a coloring layer

Continued front page    F-term (reference) 4F100 AA19 AA20 AA21 AK04 AK07                       AK25 AK25G AK41 AK42                       AR00D AT00A BA04 BA05                       BA07 BA10A BA11D CB02                       EH46 EH66 EH66B EJ97                       GB15 GB90 HB00C HB31D                       JD02 JD03 JD09 JL10C                       JL12D JN01B

Claims (4)

[Claims] 1. A laminated film having a gas barrier property including at least a transparent vapor-deposited film layer, a printing substrate layer having a colored layer made of a printing ink on the surface thereof, and a sealant film layer. 2. A laminated film in which at least a transparent vapor deposition film layer, a printing substrate layer having a colored layer made of a printing ink provided on the surface, and a sealant film layer are laminated in this order, and the transparent vapor deposition film layer. 2. The laminated film according to claim 1, wherein the vapor-deposited surface and the colored surface of the printing substrate layer, which is made of printing ink, are laminated so as to face each other. 3. A laminated film comprising at least a printing substrate layer having a colored layer of a printing ink provided on the surface thereof, a transparent vapor deposition film layer, and a sealant film layer, which are laminated in this order. The laminated film according to claim 1, wherein the colored surface made of the printing ink and the vapor deposition surface of the transparent vapor deposition film layer are laminated so as to face each other. 4. The laminated film according to claim 1, further comprising at least a step of forming an adhesive layer on the surface of a colored layer made of a printing ink provided on the surface of the printing substrate layer and laminating the adhesive layer. Method of laminating films.