JPH1191027A - Label for molded vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To intercept UV ray through adhesion to a molded vessel, and prevent oxidation decomposition by the use of a laminate sheet constituted of a UV ray intercepting layer, heat adhesive resin layer with molded vessel resin, or sticking adhesive layer, and having a transparent UV intercepting part for a base film. SOLUTION: The molded vessel label 10 having a UV ray intercepting property is a laminated sheet having a pattern layer 2 set on the base material film 1, being constituted of an adhesive resin layer 6 including at least a UV ray intercepting layer 4 and adhesive resin layer with a molded vessel, or a sticking adhesive layer, and having a transparent UV ray intercepting part 11. Also, it is a molded vessel label further having a gas barrier UV ray intercepting part with a transparent gas barrier layer laminated thereon. In addition, the UV ray intercepting layer 4 is one in which a film is made by kneading a UV ray intercepting agent in thermoplastic resin, or a paint containing a UV ray intercepting agent is coated on a transparent film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a label attached to the surface of a transparent plastic molded container, and more particularly, to an ultraviolet ray which makes the contents visible and imparts a barrier property and further promotes a chemical change. The present invention relates to a label for a transparent molded container which imparts a barrier property against oxygen and the like to prevent deterioration of the contents due to oxygen or light.

[0002]

2. Description of the Related Art Conventionally, a molded container made of a polyolefin resin, which is a general-purpose resin, has a water vapor barrier property, but the barrier property against ultraviolet rays, oxygen gas, etc., which promotes a chemical change of contents, is not always satisfactory. . In order to impart ultraviolet blocking properties to the molded container, the container is colored or simply, an aluminum foil, a metallized film, a light-shielding ultraviolet blocking label such as printing is attached with an adhesive or the like, or Instead of sticking with an adhesive or the like, in-mold molding has been performed in which a label formed by laminating a resin of a molded article and a film which is bonded by heat during molding is bonded by heat during molding. Further, in order to provide the molded container with an oxygen gas barrier property, a laminated sheet containing a transparent saponified ethylene / vinyl acetate copolymer or the like has been used for the laminated label. In addition, the container body itself has been made of a molded container made of a multilayer sheet containing a material having another oxygen gas barrier property, such as polyester, nylon, or vinylidene chloride.

[0003] However, a molded container on which a label in which a light-shielding film such as an aluminum foil, a metal-deposited film, or a print is laminated and a film that adheres to a resin of a molded product is adhered, has various barrier properties of the aluminum foil. Although it has a function of preserving the action to prevent deterioration of both sides of ultraviolet rays and oxygen and has a protective property of the contents, it is inferior in merchantability in which the contents cannot be seen. In addition, although the contents of the laminated resin film having a transparent oxygen gas barrier property are visible, the contents are degraded (discoloration, fading, oxidation of fragrance and oil, etc.) due to light, especially ultraviolet rays, There was a problem that shelf life at a store decreased.

[0004]

The present invention is applied to a molded container made of general-purpose resin such as polypropylene and polystyrene,
Ultraviolet rays which cause deterioration of the contents can be shielded by a transparent (meaning, a haze having visible light transmissiveness in which the contents can be seen is 10% or less; the same applies hereinafter) film,
Further, it is an object of the present invention to provide a transparent ultraviolet shielding label which prevents deterioration such as oxidation caused by oxygen gas.

[0005]

In order to solve the above-mentioned problems, the present invention provides a substrate film comprising at least an ultraviolet ray blocking layer and a heat-adhesive resin layer or a pressure-sensitive adhesive layer of a resin of a molding container. This is a molded container label formed of a laminated sheet having an adhesive resin layer and having a transparent ultraviolet shielding portion. In addition, the present invention is a label for an ultraviolet-shielding molded container in which a transparent gas barrier layer is further laminated on the laminated sheet including the ultraviolet-shielding layer. The ultraviolet ray blocking layer is a label for a molded container having an ultraviolet ray shielding layer formed by applying a coating containing a ultraviolet ray blocking agent to a film produced by kneading an ultraviolet ray blocking agent into a thermoplastic resin or a transparent film. The gas barrier layer is a label for a molded container, wherein the gas barrier layer is a metal oxide vapor-deposited film or a saponified ethylene / vinyl acetate copolymer film.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG.
Is provided with an adhesive resin layer 6 comprising at least a heat bonding resin layer or an adhesive layer between the ultraviolet shielding layer 4 and the resin of the molding container, and a transparent ultraviolet shielding section 11 is provided. For laminated container formed of laminated sheet 10
It is. In addition, as shown in FIG. 2, a label for a molded container having a gas barrier UV cut portion 12 in which a transparent gas barrier layer 5 is further laminated on the laminated sheet including the ultraviolet shielding layer 4. The ultraviolet ray shielding layer 4 is a molded container label 10 in which a film is formed by kneading an ultraviolet ray shielding agent into a thermoplastic resin, or a transparent film is formed by applying a coating containing an ultraviolet ray shielding agent. . And the said gas barrier layer 5 is the label 10 for molded containers which is a vapor-deposited film of a metal oxide or a film of a saponified ethylene / vinyl acetate copolymer.

As shown in FIG. 3, the transparent molded container label 10 of the present invention is attached to the side portion 8 and the bottom portion 9 of the molded container 20 as shown in FIG. May be attached only to the side portion 8. Although not shown, this label can also be used as a constituent material of a lid member for which a transparent portion is provided to show the inside.

For molding the container, a usual thermoplastic resin molding method such as injection molding or pressure molding, vacuum molding, blow molding or injection blow molding can be applied. Then, during molding, in-mold molding in which the laminated sheet is formed into a label shape, temporarily attached so as to be in contact with the molding resin side, and bonded by the heat of the molding resin is a preferable method.

[0009] The resin used for the container is not only a normal thermoplastic resin such as polystyrene, polypropylene, polyethylene, polyester, polyamide and polyvinyl chloride, but also a thermosetting resin such as unsaturated polyester, melamine resin and urea resin. Is also selected.

The base film 1 used in the present invention is shown in FIG.
As shown in the figure, a pattern layer 2 is provided on a base film 1. Next, the ultraviolet ray shielding layer 4 is formed by laminating a film including the ultraviolet ray shielding layer 4 by dry lamination or the like via the adhesive layer 3 or applying a coating liquid containing the ultraviolet ray shielding layer. When in-mold molding is performed with the molding resin, the film is further thermally bonded to the molding resin, and a film of a material that is less deformed by expansion and contraction due to the heat is bonded to the adhesive layer 3.
To form an adhesive resin layer 6 by dry lamination, melt extrusion coating (including co-extrusion coating), or lacquer coating,
The molded container label 10 having the transparent ultraviolet shielding portion 11 is constituted.

As shown in FIG. 2, the gas barrier film used in the molded container label 10 of the present invention has a pattern film 2 provided on a base film 1 and an ultraviolet shielding layer 4 formed as in the above-mentioned laminated sheet. I do. Further, a film 5 having gas barrier properties is laminated on the surface of the ultraviolet blocking layer 4 by dry lamination or the like via the adhesive layer 3. Gas barrier layer 5
Applies a material having gas barrier properties (eg, polyvinylidene chloride dispersion, aqueous solution of polyvinyl alcohol) to the base film 1 or the ultraviolet blocking layer 4 on which the picture layer is provided, in addition to laminating the film. Alternatively, the gas barrier layer 5 can be formed by providing the gas barrier layer 5 by vapor deposition of a metal oxide or the like. When a vapor deposition film is provided on the surface of the picture layer 2, by providing a transparent varnish on the surface of the picture layer, the vapor deposition film can be uniformly finished and the adhesion of the vapor deposition film can be improved. When used for in-mold molding as described above, the adhesive resin layer 6 is further provided to form the molded container label 10 having the transparent gas-barrier ultraviolet shielding portion 12.

As described above, the label for a molded container according to the present invention comprises a base film 1, a picture layer 2, an ultraviolet shielding layer 4, a gas barrier layer 5, and an adhesive resin layer 6, if necessary. Basically, it is formed by providing a dry lamination provided with an adhesive or a primer layer (not shown) for strengthening the adhesion, if necessary.

However, the order of stacking is not limited as described above. For example, as shown in FIG.
Films (adhesive resin layer) made of the same resin as the molded container can be formed on both sides of the molded container label 10 to prevent curling when used as a label.
Such a laminated sheet can be made to have the same physical properties as a molded container such as surface gloss and the like, or can be formed by fusing a molding resin to both sides of the laminated sheet to obtain a strong adhesive that does not cause the label to peel off or fall off from the end. . Further, it can be used as a mere barrier label without a picture layer to provide a molded container with a barrier property.

The construction order of the ultraviolet shielding layer 4 and the gas barrier layer 5 may be reversed, or the ultraviolet shielding layer 4 may be sandwiched between two gas barrier layers 5 for the purpose of preventing elution of the ultraviolet shielding agent as shown in FIG. It is possible to apply a barrier agent, or use a film (for example, a vinylidene chloride-coated polyester film) in which a gas barrier film and a printing substrate are shared, and the number of layers constituting the film can be arbitrarily increased or decreased according to the purpose of use.

The base film is preferably obtained not only for printing but also in a rolled form suitable for bonding with other films constituting the laminated sheet, and is preferably a stretched or unstretched film of a thermoplastic resin, or a film thereof. A film obtained by laminating another material on a film or processing by coating or the like is used. For example, polyester, polypropylene, polyethylene, polystyrene, polycarbonate, ethylene
Saponified vinyl acetate copolymers, acrylic resins, polyamides, polyvinyl chloride, cellulose acetate films, cellophane, and those obtained by laminating two or more of these by a normal lamination method are used. The thickness depends on the rigidity, strength, and workability of the material, but is 6 to 188.
μm is used.

The pattern layer of the molded container label of the present invention is formed by gravure printing or flexographic printing, which is a usual method for printing a plastic film. The pattern layer 2 is usually printed on the base film 1 as shown in FIGS. 1 and 2 and another ultraviolet blocking layer and a gas barrier layer are provided on the printed side. Is applied to a laminated sheet provided with the pattern layer 2 or a laminated sheet not provided with the pattern layer by a normal image forming method such as rotary printing, sheet-fed printing, or transfer printing (for example, a manufacturing factory, a manufacturing date, a campaign (If additional printing is necessary). The side to be printed is determined by the method of use of the label, and does not matter in any case. In the case of backside printing in which an image is viewed through a label, the image is durable because of the presence of a protective sheet, but requires an adhesive treatment with a molded container (such as application of an adhesive). Also, when performing surface printing as shown in FIG. 7, it is not necessary to consider the method of bonding to the molding container, but the image protection is inevitably inferior to other image forming methods. Is a lacquer type, curable type (thermal curing, ionizing radiation curing)
Can be overprinted with a transparent varnish. In addition, when a metallic pattern layer with metallic luster is required, after printing on the base film, the partial vapor deposition method (eluting the primer layer after evaporating the entire surface onto the soluble pattern layer (primer layer), After the entire surface is deposited, the resist can be printed, and a non- (resist) printed portion can be formed by a known method such as elution removal.

The material for blocking ultraviolet rays of the label for a molded container can be selected from ordinary ultraviolet absorbers and the like. The ultraviolet absorber absorbs harmful ultraviolet rays having a wavelength of 390 nm, preferably 290 nm or less, which are chemically active and contained in sunlight, fluorescent lamps and the like. This ultraviolet absorber converts into heat energy in the molecule. For example, benzophenone-based, benzotriazole-based, salicylate-based, cyanoacrylate-based, formamidine, hindered amine-based compounds, etc. are used alone or in combination. These ultraviolet absorbers can be kneaded with a raw material resin to form a film, or can be coated on a film by selecting a suitable binder to form a paint. Further, the ultraviolet shielding layer may be formed by applying and coating ultrafine particles of a metal oxide with an appropriate binder.

The gas barrier layer is formed by coating a suitable base film with a material having a barrier property, such as polyvinylidene chloride or polyvinyl alcohol, or by depositing a metal oxide such as ITO, ZnO ₂ , aluminum oxide, or SiOx. There is a film provided by sputtering. In addition, ethylene
A saponified vinyl acetate copolymer or an aromatic polyamide can be formed into a film and used. Further, a film on which these gas barrier layers are deposited or coated can be used as a base film for printing. And the thickness is 10
Those having a pattern layer of 188 μm and provided with a picture layer by ordinary gravure printing, flexographic printing or the like are also preferable in that they can be used as a printing substrate.

The laminated sheet of the present invention is formed by ordinary dry lamination or sandwich lamination (for example, polyethylene lamination) using a thermoplastic resin as an adhesive layer. Dry lamination adhesives include common polyester, polyester / polyurethane, polyether, polyether / polyurethane,
Use two-component reactive adhesives using a vinyl chloride / vinyl acetate copolymer and polyisocyanate as curing agents, or one-component reactive adhesives based on polyether / polyurethane / polyisocyanate, polyester, polyurethane / polyisocyanate .

The thermal adhesive resin layer 6 of the laminated sheet used for in-mold molding is, as a general rule, formed by laminating a film formed of the same material as the container by melt extrusion coating (including co-extrusion coating). Can be. In addition, a thermosetting resin having a low melting point by adding a copolymer of a molding resin or a tackifier may be used. This method is particularly effective when the laminated sheet is formed of a stretched film. Further, a heat-adhesive resin layer is formed by providing a resin varnish having a heat-adhesive property with a molding resin or a primer layer (anchor layer) for strengthening the adhesion on a film provided with a gas barrier layer or an ultraviolet blocking layer. Can also. The thickness of the heat bonding resin layer is preferably 2 to 60 μm, and when it is provided by coating with a resin varnish, there is an advantage that it can be formed with a relatively thin (1 to 15 μm) thickness.

When the in-mold molding shown in FIG. 3 is used as the label, the molded container label shown in FIG.
As shown in FIG. 8A, a fan-shaped side sticking label 13 as shown in FIG.
A circular bottom sticking label 14 provided with a gate hole 16 shown in FIG. Then, the label was temporarily attached to the side and bottom of the female mold, and if necessary, the label of each of the suction holes provided in the female mold was fixed by vacuum suction, and the male mold was inserted and heat-melted from the gate. A molding container 20 is prepared by injecting a molding resin and attaching a label. When the label is provided on the entire bottom surface as shown in FIG. 4, a bottom sticking label 15 without a gate hole shown in FIG. 8C is temporarily attached to the bottom of the female mold, and the male mold is formed by injection molding resin. It can be molded by moving and adhering to the surface. As for such a technology, a technology which has a high effect of blocking ultraviolet rays and gas barrier properties, which are the objects of the present application, is also disclosed.

The label for the molded container can be used in a shape other than FIG. 8 according to the purpose. For example, it is also possible to cut the corners of the fan-shaped side sticking label and change the flow of the molding resin to prevent the movement of the sheet during molding. A simple circular label without a gate hole at the center of the label attached to the bottom is also an example. The label having no gate hole may be made of a heat-resistant film (eg, an aromatic polyester film) that does not melt due to the heat of the molding resin, or may be a heat-resistant reactive / curable adhesive or a transparent varnish coating. It is necessary to form a label by providing a working layer (polyester / polyisocyanate type adhesive or ionizing radiation curable resin).

In order to adhere the laminate to the molded container of the present invention, in addition to the above-mentioned in-mold molding by heat welding, the above-mentioned reactive adhesive can be used, or the laminate can be adhered using an adhesive. . The adhesive is basically composed of an elastomer such as synthetic resin, natural rubber, or synthetic rubber, and a tackifier of rosin or a derivative thereof, and is a material having excellent heat resistance and light resistance using an acrylate copolymer. Can be preferably used in the present invention.

Hereinafter, the structure of the molded container label of the present invention will be described in more detail with reference to Examples.

【Example】

Example A molded container label having a transparent ultraviolet ray blocking layer or a ultraviolet ray blocking layer and a gas barrier layer having the layer constitution shown in Table 1 was prepared, and the ultraviolet ray blocking effect and gas barrier property were measured and evaluated. Table 2 shows the evaluation results.

The symbols in Table 1 mean the following films or layers, and the numerical values indicate the thickness. Surface: CP: Unstretched polypropylene film Antistatic product: Contact: Two-part curable adhesive (by dry lamination) Mark: Picture layer (10 mm by gravure printing)
-Window M with a transparent part of φ)-Mark M: Metallic pattern layer by partial vapor deposition-PET: Biaxially stretched polyester film-uuPET: Stretched polyester film incorporating an ultraviolet ray blocking agent-uPET: Stretched polyester film coated with an ultraviolet ray blocking agent・ Surface side OP: Biaxially oriented polypropylene film
Antistatic product ・ Adhesive resin layer side CP: unstretched polypropylene film ・ sPET: SiOx evaporated PET film, SiO
x200Å aPET: aluminum oxide deposited PET film, Al ₂ O ₃ 300Å kOP: vinylidene chloride coated biaxially oriented polypropylene film EVOH: saponified ethylene / vinyl acetate copolymer film vOP: polyvinyl alcohol coated film OP (HS) ): Heat-sealable biaxially oriented polypropylene film ・ PS: Unstretched polystyrene film (margin)

[0026]

[Table 1]

[0027]

[Table 2]

[0028]

The labels for the molded containers of Examples 1 to 20 and Comparative Example 1 constitute containers exhibiting ultraviolet blocking and oxygen barrier effects as shown in Table 2 when attached to the molded containers. It is. Since the label is transparent to visible light, the contents have merchantability that can be identified from the outside. In addition, since the ultraviolet rays are blocked, the contents are prevented from being deteriorated (fading, oxidation of oil), and have a good taste. This has the effect of extending the deadline.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a molded container label of the present invention.

FIG. 2 is a schematic cross-sectional view in which a gas barrier layer is provided on a molded container label.

FIG. 3 is a schematic sectional view showing a state where a label is attached to a molded container.

FIG. 4 is a schematic sectional view showing another state in which a label is attached to a molded container.

FIG. 5 is a schematic sectional view showing another configuration of the molded container label.

FIG. 6 is a schematic sectional view showing another configuration of the molded container label.

FIG. 7 is a schematic cross-sectional view showing a configuration in which a picture layer is provided on the surface of a molded container label.

FIG. 8A is a plan view showing an example of a label shape when a label is attached to a side portion of a molded container. (B) It is a top view which shows an example of a label shape when sticking a label to the bottom part of a molded container. (C) It is a top view which shows the example of another shape label at the time of sticking a label to the bottom part of a molded container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base film 2 Picture layer 3 Adhesive layer 4 Ultraviolet shielding layer 5 Gas barrier layer 6 Adhesive resin layer 8 Side of molding container 9 Bottom of molding container 10 Label for molding container 11 Transparent ultraviolet shielding part 12 Gas barrier ultraviolet shielding part 13 Side sticker label 14, 15 Bottom sticker label 16 Gate hole 20 Molded container

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI G09F 3/00 G09F 3/00 Q 3/02 3/02 A

Claims (4)

[Claims] 1. A substrate film, comprising at least an ultraviolet shielding layer and an adhesive resin layer comprising a heat adhesive resin layer or an adhesive adhesive layer with a resin of a molding container, and a transparent ultraviolet shielding portion. A label for a molded container, comprising a laminated sheet having the same. 2. A laminated sheet including the ultraviolet ray blocking layer,
A label for a molded container capable of blocking ultraviolet rays, further comprising a transparent gas barrier layer laminated thereon. 3. The ultraviolet shielding layer is formed by coating a film obtained by kneading an ultraviolet shielding agent into a thermoplastic resin, or by coating a transparent film with a coating material containing the ultraviolet shielding agent. 4. The label for a molded container according to 4. 4. The molded container label according to claim 1, wherein the gas barrier layer is a metal oxide vapor-deposited film or a saponified ethylene / vinyl acetate copolymer film.