JP4228669B2 - Laminated packaging material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a laminated packaging material, and more particularly to a laminated packaging material suitable for packaging articles such as electronic components such as ICs and LSIs, which are easily damaged by static electricity and corroded by water vapor and oxygen.
[0002]
[Prior art]
In packaging bodies that wrap articles such as IC and LSI electronic parts and magnetic recording media, it is possible to prevent dielectric breakdown of articles due to overcurrent, and it is possible to visually recognize stored articles without opening them. In addition, it is desired that dust can be prevented from adhering due to electrostatic charging. As a packaging material that is transparent and has antistatic properties and electrostatic shielding properties, for example, an antistatic coating layer is formed on one surface of a base film, and an ultra-thin aluminum vapor deposition thin film layer and There is an electrostatic shielding packaging material having a structure in which sealant layers having antistatic properties are sequentially laminated.
[0003]
Furthermore, in addition to the above performance, laminated packaging materials used for packaging bodies that contain electronic components are required to have gas barrier properties that prevent the entry of water vapor and oxygen from the outside air to prevent corrosion of electronic components. In order to meet these requirements, for example, there is a method of laminating an ethylene / vinyl alcohol copolymer film on the electrostatic shielding packaging material, but this configuration is an ethylene / vinyl alcohol copolymer. Since the film is used, both the oxygen barrier property and the water vapor barrier property are insufficient, and among them, the water vapor barrier property is particularly insufficient.
[0004]
Therefore, as an alternative to this ethylene / vinyl alcohol copolymer film, a metal oxide vapor-deposited thin film layer such as aluminum oxide or silicon oxide is formed on one surface of a base film such as a biaxially stretched polyester film or a biaxially stretched nylon film. By using the laminated vapor-deposited film, a laminated packaging material having excellent electrostatic shielding properties and gas barrier properties can be obtained.
[0005]
[Problems to be solved by the invention]
However, gas barrier properties such as oxygen and water vapor are still insufficient when only one metal oxide vapor-deposited thin film layer such as aluminum oxide or silicon oxide is deposited. Moreover, in order to improve gas barrier property more, it is necessary to make the film thickness of a metal oxide vapor deposition thin film layer into a certain level or more, and in that case, the obtained vapor deposition film turns yellow and transparency is impaired.
[0006]
Moreover, when providing a printing layer in the laminated packaging material which laminated | stacked the sealant layer on the metal oxide vapor deposition thin film layer surface of the said vapor deposition film via the contact bonding layer, between the base film of a vapor deposition film, and a metal oxide vapor deposition thin film layer If it is provided, there is a problem that the thin film cannot be formed satisfactorily due to the influence of volatile components derived from the ink of the printing layer when forming the metal oxide vapor-deposited thin film layer, and between the metal oxide vapor-deposited thin film layer and the adhesive layer of the vapor-deposited film. When it provided, when the printing layer was visually recognized from the base film side of the vapor deposition film, the bad effect that the printing layer was not fully visible had occurred.
[0007]
An object of the present invention is to provide a laminated packaging material that has excellent electrostatic shielding properties and gas barrier properties, has good visibility of a printed layer from the outside, and is suitable for packaging electronic components and the like. .
[0008]
[Means for Solving the Problems]
In the invention according to claim 1 of the present invention, a metal oxide vapor-deposited thin film layer, a gas barrier film layer, and an aluminum vapor-deposited thin film layer having a thickness of 2 to 15 nm are sequentially laminated on at least one surface of a base material layer made of a polymer film. A laminated packaging material in which a printed layer is laminated on an aluminum vapor-deposited thin film layer having a thickness of 2 to 15 nm of a barrier laminated film, and a sealant layer is laminated on the other surface of a base material layer made of a polymer film , A laminated packaging material characterized in that the gas barrier coating layer comprises a water-soluble polymer and at least one of (a) one or more metal alkoxides and their hydrolysates or (b) tin chloride .
[0015]
The invention according to claim 2 of the present invention further antistatic coating layer on the printing layer is a laminated packaging material according to claim 1, characterized by being laminated on the outermost surface.
[0016]
The invention according to claim 3 of the present invention is the laminated packaging material according to claim 1 or 2 , wherein antistatic properties are imparted to the sealant layer.
[0017]
The invention according to claim 4 of the present invention, the metal oxide is aluminum oxide, silicon oxide, a stack of any one of claims 1 to claim 3, characterized in that a magnesium oxide or mixtures thereof It is a packaging material.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
The laminated packaging material of the present invention will be described in detail below along the embodiments.
[0020]
FIG. 1A is a side cross-sectional view of a laminated packaging material of a reference example, and in the order of thickness, a printed layer (2), a base material layer (1), a metal oxide deposited thin film layer (4), and a gas barrier coating. A layer (5), an aluminum vapor-deposited thin film layer (6) having a thickness of 2 to 15 nm, an adhesive layer (7a), and a sealant layer (8) are sequentially laminated, and (b) is a laminated package of one embodiment of the present invention. It is a sectional side view of material, and print layer (2), 2-15 nm thick aluminum vapor deposition thin film layer (6), gas barrier film layer (5), metal oxide vapor deposition thin film layer (4) in order of thickness direction. The base material layer (1), the adhesive layer (7a), and the sealant layer (8) are sequentially laminated, and (c) is a side sectional view of the laminated packaging material of still another reference example, and sequentially in the thickness direction. , Antistatic coating layer (3), printing layer (2), substrate layer (1), metal oxide vapor deposited thin film layer (4), gas Rear coating layer (5), an aluminum vapor deposited film layer having a thickness of 2 to 15 nm (6), adhesive layer (7a), and a sealant layer (8) are sequentially laminated, (d) is further another of the present invention It is a sectional side view of the lamination | stacking packaging material of an Example, An antistatic coating layer (3), a printing layer (2), an aluminum vapor deposition thin film layer (6) with a thickness of 2-15 nm, a gas-barrier film layer in order of the thickness direction. (5), a metal oxide vapor-deposited thin film layer (4), a base material layer (1), an adhesive layer (7a), and a sealant layer (5) are sequentially laminated.
[0021]
The laminated packaging material of FIG. 1 (b) has an excellent gas barrier property and a thickness because the metal oxide vapor-deposited thin film layer (4) and the gas barrier coating layer (5) are laminated in the laminated structure. Since an aluminum deposited thin film layer (6) having a thickness of 2 to 15 nm is laminated, it has excellent electrostatic shielding properties, and a printed layer (2) is laminated on the outermost layer, so that the printed layer (2) is visually recognized. The property is also good.
Further, since the laminated packaging material (d) further has the antistatic coating layer (3) laminated on the outermost surface on the printed layer (2), the antistatic property of the surface is excellent.
[0022]
FIG. 2A is a side sectional view of a laminated packaging material of still another reference example, and in order in the thickness direction, a transparent film layer (9), a printed layer (2), an adhesive layer (7b), and a base material layer. (1), metal oxide vapor-deposited thin film layer (4), gas barrier coating layer (5), aluminum vapor-deposited thin film layer (6) having a thickness of 2 to 15 nm, adhesive layer (7a), and sealant layer (8) are sequentially laminated. (B) is a side sectional view of a laminated packaging material of still another reference example, and in order of the thickness direction, the transparent film layer (9), the printing layer (2), the adhesive layer (7b), the thickness 2-15 nm aluminum vapor deposition thin film layer (6), gas barrier film layer (5), metal oxide vapor deposition thin film layer (4), base material layer (1), adhesive layer (7a), sealant layer (8) in this order are stacked, (c) is further a side sectional view of a laminated packaging material of another reference example, forward in the thickness direction , Antistatic coating layer (3), transparent film layer (9), printing layer (2), adhesive layer (7b), substrate layer (1), metal oxide vapor-deposited thin film layer (4), gas barrier coating layer ( 5) An aluminum-deposited thin film layer (6) having a thickness of 2 to 15 nm, an adhesive layer (7a), and a sealant layer (8) are sequentially laminated, and (d) is a layered packaging material of still another reference example. FIG. 4 is a side sectional view showing, in order, in the thickness direction, an antistatic coating layer (3), a transparent film layer (9), a printing layer (2), an adhesive layer (7b), and an aluminum vapor-deposited thin film layer having a thickness of 2 to 15 nm (6 ), A gas barrier coating layer (5), a metal oxide vapor-deposited thin film layer (4), a base material layer (1), an adhesive layer (7a), and a sealant layer (8) are sequentially laminated.
[0024]
The substrate layer (1) is made of a polymer material, and for example, those having mechanical strength and dimensional stability such as polyethylene terephthalate (PET) resin, polypropylene (PP) resin, nylon (Ny) resin and the like are preferable. Is processed into a film and further stretched in the biaxial direction. In order to improve the adhesion to the surface of the base material layer (1), corona treatment, low temperature plasma treatment, ion bombardment treatment may be performed as pretreatment, and further chemical treatment, solvent treatment, etc. are performed. May be.
[0025]
The thickness of the base material layer (1) is not particularly limited, but in consideration of suitability as a packaging material, workability when laminating other films or forming a deposited thin film layer, etc., 6 to 50 μm. The range of is preferable.
[0026]
In consideration of mass productivity, it is desirable to use a long film so that the deposited thin film layer can be continuously formed.
[0027]
The printing layer (2) is formed by using various types of ink that are generally used for printing packaging materials, for example, a pigment and a solvent added to a binder resin and kneaded.
[0028]
The antistatic coat layer (3) is formed by applying and drying a quaternary ammonium salt surfactant solution, a fatty acid polyhydric alcohol ester surfactant solution or a polyester oligomer solution. The coating amount is preferably 0.01 to 0.05 g / m ² (dry state), and the surface resistivity is preferably 10 ¹¹ Ω / □ or less.
[0029]
The metal oxide used for the metal oxide vapor-deposited thin film layer (4) is aluminum oxide, silicon oxide, magnesium oxide or a mixture thereof. The film thickness of the thin film layer is preferably in the range of 5 to 300 nm, and the value is appropriately selected. However, if the film thickness is 5 nm or less, a uniform thin film may not be formed on the entire surface of the base material layer (1), and the function as a gas barrier material may not be sufficiently achieved. On the other hand, when the film thickness exceeds 300 nm, the deposited thin film cannot be kept flexible, and the deposited thin film may be cracked due to external factors such as bending and pulling after the deposition. The forming method is performed by a known vacuum film forming method.
[0030]
The gas barrier coating layer (5) is formed to protect the metal oxide vapor-deposited thin film layer (4) and to give higher gas barrier properties, and its components include a water-soluble polymer, ( It is formed using a coating agent containing at least one of a) one or more metal alkoxides and a hydrolyzate or (b) tin chloride, and using an aqueous solution of the component or a water / alcohol mixed solution as a main component. Evaporation thin film layer: A solution in which water-soluble polymer and tin chloride are dissolved in an aqueous (water or water / alcohol mixed) solvent, or a solution in which metal alkoxide is directly or previously hydrolyzed is mixed. It is formed by laminating and drying by heating.
[0031]
Examples of the water-soluble polymer used in the gas barrier coating layer (5) include polyvinyl alcohol, polyvinyl pyrrolidone, starch, methyl cellulose, carboxymethyl cellulose, and sodium alginate. In particular, when polyvinyl alcohol (hereinafter referred to as PVA) is used, gas barrier properties are most excellent. The PVA as used herein is generally obtained by saponifying polyvinyl acetate, ranging from a so-called partially saponified PVA in which several tens percent of acetic acid groups remain to completely saponified PVA in which only several percent of acetic acid groups remain. Including, but not limited to.
[0032]
The tin chloride may be stannous chloride (SnCl ₂ ), stannic chloride (SnCl ₄ ), or a mixture thereof, and may be an anhydride or a hydrate.
[0033]
Further, the metal alkoxide is preferably tetraethoxysilane, triisopropoxyaluminum or a mixture thereof.
[0034]
The gas barrier coating layer (5) is formed by using a conventionally known means such as a dipping method, a roll coating method, a screen printing method, a spray method or the like that is usually used. The film thickness after drying may be 0.01 μm or more, but if the thickness exceeds 50 μm, cracks are likely to occur in the film, so the range of 0.01 to 50 μm is preferable.
[0035]
The aluminum vapor-deposited thin film layer (6) is very thin with a thickness of 2 to 15 nm, and therefore has good transparency and good electrostatic shielding properties.
[0036]
The adhesive layers (7a) and (7b) are two liquids that are used by mixing two liquids of a main agent having a hydroxyl group and a curing agent having an isocyanate group, as is generally used in packaging materials. Formed by a well-known coating method such as gravure coating method or roll coating method using one-component adhesives that use molds or those having isocyanate groups alone, or anchor coating agents such as polyethyleneimine or organic titanate To do. The coating amount is preferably 0.5 to 5 g / m ² (dry state).
[0037]
When using an anchor coating agent, a low density polyethylene resin layer may be provided on the surface to which the anchor coating agent is applied in order to further strengthen the adhesive force.
[0038]
The sealant layer (8) is usually formed using a polyolefin resin. Examples of polyolefin resins to be used include ethylene resins such as low density polyethylene resins, linear low density polyethylene resins, medium density polyethylene resins, high density polyethylene resins, ethylene / α-olefin copolymer resins, and homopolymers. Selection of polypropylene resins such as polypropylene resins, propylene / ethylene random copolymers, propylene / ethylene block copolymers, propylene / α-olefin copolymers, and graft polymerization of these olefin resins is possible. It is also possible to use a modified polyolefin resin that has been acid-modified by such means. The above-mentioned polyolefin resin may be a single substance or a blend of two or more kinds. The thickness is appropriately selected.
[0039]
In the case of imparting antistatic properties to the sealant layer (8), 500 to 3000 ppm of an antistatic agent is added to the polyolefin resin described above, and a kneaded mixed resin is used. Antistatic agents include cationic systems such as quaternary ammonium salts, nonionic systems such as fatty acid polyhydric alcohol esters and polyoxyethylene adducts, amphoteric systems such as betaine salts and alanine salts, phosphate salts, sulfonates, etc. These anionic surfactants are used alone or in combination. Using these mixed resin, the surface resistivity of the sealant layer (8) preferably to 10 ¹¹ Ω / □ or less. The thickness is appropriately selected so that the surface specific resistance can be obtained.
[0040]
【The invention's effect】
The laminated packaging material of the present invention is
At least a barrier layered film having a thickness of 2 to 15 nm is formed by sequentially laminating a metal oxide deposited thin film layer, a gas barrier coating layer, and an aluminum deposited thin film layer having a thickness of 2 to 15 nm on one side of a base material layer made of a polymer film. A printed layer is laminated on the aluminum vapor-deposited thin film layer, and a sealant layer is laminated on the other side of the base material layer made of a polymer film, so that it has excellent gas barrier properties and electrostatic shielding properties, as well as a good printed layer. Visible. Further , an excellent antistatic property on the surface can be obtained by laminating an antistatic coating layer on the outermost surface or imparting an antistatic property to the sealant layer.
[Brief description of the drawings]
1A is a side sectional view of a laminated packaging material of a reference example, FIG. 1B is a side sectional view of a laminated packaging material of one embodiment of the present invention , and FIG. 1C is another reference example. It is a sectional side view of this laminated packaging material, (d) is a sectional side view of the laminated packaging material of another Example.
2 (a) is a side sectional view of a laminated packaging material of Reference Example, (b) further is a side sectional view of a laminated packaging material of another reference example, (c) yet another reference example It is a sectional side view of the laminated packaging material of (d), and (d) is a sectional side view of the laminated packaging material of another reference example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Base material layer 2 ... Printing layer 3 ... Antistatic coating layer 4 ... Metal oxide vapor deposition thin film layer 5 ... Gas barrier property coating layer 6 ... Aluminum vapor deposition thin film layer 7a, 7b ... Adhesive layer 8 ... Sealant layer 9 ... Transparent film layer 10 ... Printed film

Claims (4)

At least a barrier layered film having a thickness of 2 to 15 nm is formed by sequentially laminating a metal oxide deposited thin film layer, a gas barrier coating layer, and an aluminum deposited thin film layer having a thickness of 2 to 15 nm on one side of a base material layer made of a polymer film. A laminated packaging material in which a printed layer is laminated on an aluminum vapor-deposited thin film layer, and a sealant layer is laminated on the other surface of the base material layer made of a polymer film , wherein the gas barrier coating layer is a water-soluble polymer, A laminated packaging material comprising at least one of (a) one or more metal alkoxides and hydrolysates thereof, or (b) tin chloride .   The laminated packaging material according to claim 1, wherein an antistatic coating layer is further laminated on the outermost surface on the printed layer.   The laminated packaging material according to claim 1 or 2, wherein the sealant layer is imparted with antistatic properties.   The laminated packaging material according to any one of claims 1 to 3, wherein the metal oxide is aluminum oxide, silicon oxide, magnesium oxide, or a mixture thereof.

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