JP2005349581A - Metallized plastic film for label - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metallized plastic film for a label useful as a label used in a state pasted on a plastic molded product, a steel plate, a can and the like and having hairline like metal gloss excellent in metal like appearance and design effect, especially enhanced in the adhesion of a hairline surface and a metallized layer and excellent in durability. <P>SOLUTION: The metallized plastic film is constituted by providing a hairline mesh on one side of a plastic film, forming a metallized film thereon, providing a copolyester resin layer at least on one side of the film and forming the hairline mesh on the copolyester resin layer. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a metal-deposited plastic film for a label, and more specifically, is useful as a surface decoration material used by being bonded to a plastic molded product, a steel plate, a can, etc., and has a hairline tone excellent in metallic appearance and design. The present invention relates to a metal vapor-deposited plastic film for labels, which is a plastic film having a metallic luster and particularly excellent in adhesion between a hairline surface and a metal vapor-deposited film layer.

  Conventionally, a method for obtaining a hairline-like metallic luster by processing a hairline and a metal vapor deposition film layer on the surface of a plastic film is known. As such a method, an insert film having hairline eyes (see Patent Document 1), a metallic decorative sheet having a hairline-like emboss on the surface (see Patent Document 2), and the like are known. However, it is also known that when a hairline is directly formed on a plastic film, the adhesion with the metal vapor deposition film layer is poor. For example, it is also used for labeling in terms of the design characteristics of hairline-like metallic luster, but after being attached to an adherend with an adhesive provided on the metal vapor deposition film side, when peeling off the plastic film and metal vapor deposition film There was a drawback that peeling occurred between the layers.

In the method of applying a hairline process to the surface using a plastic film and forming a metal vapor deposition film layer on the hairline, when the metal vapor deposition film layer is formed on the processed surface, the plastic film and the metal vapor deposition film are formed as described above. There was a problem that the adhesion of the layer was poor.
Japanese Patent Laid-Open No. 10-15987 JP-A-8-216334

  An object of the present invention is to provide a metal-deposited plastic film for a label which is excellent in adhesion between the hairline surface and the metal-deposited film layer, in particular, while being a plastic film having a hairline-like metallic luster.

  The metal-deposited film for a label of the present invention is a film having a hairline on one side of a plastic film, and a metal-deposited film formed thereon, and a copolymer polyester resin layer on one side of the film, and It is a metal-deposited plastic film for labels, in which the hairline is formed on the copolymerized polyester resin layer.

  The metal vapor-deposited plastic film for labels according to the present invention is useful as a surface decoration material for labeling purposes that are used by being attached to plastic molded products, steel plates, cans, etc., and has a hairline tone excellent in metallic appearance and design. A metal vapor-deposited plastic film for a label having a metallic luster, excellent in adhesion between the hairline surface and the metal vapor-deposited film layer, and excellent in durability can be obtained.

  The metal-deposited film for a label of the present invention is a film having a hairline on one side of a plastic film, and a metal-deposited film formed thereon, and a copolymer polyester resin layer on one side of the film, and The hairline is formed in the copolymerized polyester resin layer.

  The plastic film in the present invention is a film made of an organic polymer material. Specific examples of the organic polymer material include polyethylene terephthalate, polyethylene naphthalate, polyethylene, polypropylene, polyamide, polyimide, polyvinyl chloride, and polyether. Examples include ether ketone, fluororesin, polyetherimide, polyphenylene sulfide, and polyurethane. The plastic film in the present invention is particularly preferably polyethylene terephthalate in terms of economy, strength, appearance, adhesion to other layers, and the like.

  In the metal-deposited film for labels of the present invention, the thickness of the plastic film is the total thickness of all the constituent layers, and is preferably in the range of 8 to 250 μm, more preferably 12 to 200 μm. If the thickness is less than 8 μm, the strength of the original fabric may not be sufficient at the time of producing the hairline, and the film may be deformed by heat generated from the evaporation source during metal deposition, which is not preferable. On the other hand, if the thickness exceeds 250 μm, the film may not be flexible, and if the substrate to be bonded is a curved surface, the followability may be poor, which is not preferable.

  In the present invention, there is a copolymerized polyester resin layer on one side of the film. In the present invention, the copolyester resin is a polyester resin comprising two or more dicarboxylic acid components and one or more diol components, or one or more dicarboxylic acid components and two or more diol components.

  Examples of the dicarboxylic acid component in the copolymerized polyester resin include various aromatic dicarboxylic acids and alicyclic dicarboxylic acids, and terephthalic acid and isophthalic acid are particularly preferable.

  Examples of the diol component include ethylene glycol, 1,2-propanediol, 1,3-propanediol, neopentyl glycol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, , 6-hexanediol, 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol and other glycols, bisphenol A or bisphenol S ethylene oxide adducts, propylene oxide adducts, etc. It can be illustrated. Of these, ethylene glycol and 1,4-cyclohexanedimethanol are particularly preferably used.

  The copolymer polyester resin may be a single copolymer composed of monomer components or a mixture of a plurality of copolymers.

  In addition, other resin can be mixed with the copolyester resin in the range which does not impair the objective of this invention. For example, polyethylene terephthalate, polyethylene naphthalate, polyethylene, polypropylene, polyamide, polyimide, polyvinyl chloride, polyether ether ketone, fluororesin, polyether imide, polyphenylene sulfide, and polyurethane can be exemplified.

  The copolymerized polyester in the present invention is more preferably lower in crystallinity and lower melting point than polyethylene terephthalate.

  The thickness of the copolyester resin layer in the present invention is preferably 0.5 μm or more and 10 μm or less, more preferably 1 μm or more and 5 μm or less, and even more preferably 1 μm or more and 3 μm or less. If it is less than 0.5 μm, it may be scraped off and lost by hairline processing, and if it exceeds 10 μm, it is necessary to make the plastic film as a base material thin. Since it becomes easy to block, it is not preferable.

  The copolyester resin layer may be on one or both sides of the film, but one side is preferred from the occurrence of blocking or the like. In addition, a coating method in which a copolyester resin is dissolved in a solvent and then applied and dried, or a co-extrusion film forming method in which two or more kinds of resins having different compositions are formed simultaneously to form two or more layers are appropriately used. Although it can be used, a coextrusion film forming method is preferably used.

  In the resin component constituting the plastic film containing the copolymerized polyester resin in the present invention, known additives such as a flame retardant, an antistatic agent, a surfactant, and a heat stabilizer are within a range not impairing the effects of the present invention. , UV absorbers, pigments, dyes, fatty acid esters, organic lubricants such as wax, antifoaming agents such as polysiloxane, and clay, mica, titanium oxide, calcium carbonate, kaolin, wet and dry for the purpose of imparting slipperiness, etc. Silica, further inorganic particles such as colloidal silica, calcium phosphate, barium sulfate and alumina, other lubricants, organic particles containing acryl, styrene, silicon and the like as constituent components may be blended.

  The plastic film in the present invention is preferably biaxially oriented from the viewpoint of mechanical and thermal properties in the state where the copolymer polyester resin layer is laminated.

  In the present invention, hairline eyes are formed on the surface of the copolymerized polyester resin layer.

  The hairline is a shape in which a large number of thin grooves are formed in a stripe shape in parallel. In the present invention, any shape of hairline is included, but the depth of the groove is the copolymer polyester resin layer. If the thickness is exceeded, the adhesion of the metal vapor deposition film in the subsequent step is lowered, which is not preferable. The hairline may be processed on one side or both sides of the plastic film, but the metal vapor deposition must be on the hairline on the copolymer polyester resin layer.

  The maximum depth of the hairline in the present invention is no problem as long as it is equal to or less than the thickness of the copolyester resin layer, but in consideration of the effect of the hairline, ease of processing, etc., preferably the depth is 0.1 to 5 μm. Hereinafter, 0.2 to 3 μm is more preferable.

  As a method for forming the hairline, there is no problem with a method that is usually used, but a method of scratching by running a film in contact with a roll having a file surface for polishing is preferably used for obtaining a suitable appearance. . Here, the polishing roll can be obtained, for example, by attaching and fixing a sandpaper to a metal roll without any gap. It is also possible to combine a plurality of films, and the rotation can be performed in the same direction as the film traveling direction or in the opposite direction, and a more preferable appearance can be obtained by combining these.

  The metal-deposited plastic film for labels of the present invention, preferably formed by depositing metal on the surface of the hairline formed as described above.

  As a preferred method for forming a metal film in the present invention, vapor deposition is suitably used. Specifically, for example, induction heating, resistance heating, sputtering, electron beam (EB), ion plating and the like can be mentioned, but a wide general vapor deposition method can be applied without any particular limitation. A vapor deposition method by heating or resistance heating is preferable in terms of productivity and vapor deposition film quality.

  Examples of the metal species constituting the metal vapor deposition film in the present invention include aluminum, tin, chromium, copper, nickel, palladium, platinum, gold, and silver. Aluminum is preferable in terms of brightness, cost performance, and the like. Used.

  The thickness of the metal film in the present invention is preferably in the range of 50 to 1000 angstroms, and more preferably in the range of 100 to 700 angstroms. If the thickness is less than 50 angstroms, the metallic luster due to reflection is insufficient or cracks are likely to occur in the metal film, which is not preferred. This is not preferable because of the tendency to The thickness of the metal film can be measured using a transmission electron microscope, a scanning electron microscope, or the like.

  According to the present invention, the adhesion strength of the metal vapor-deposited film after hairline processing is improved by the presence of the copolymerized polyester resin layer. As an index of the adhesive strength between the copolymerized polyester resin layer and the metal film, an adhesive layer of about 15 μm is coated with an acrylic pressure-sensitive adhesive on the metal vapor-deposited surface of a plastic film cut into a strip of 10 mm width and dried. Then, the test piece is affixed to the ABS resin plate and rubbed back and forth twice while strongly pressing the test piece with a finger. Thereafter, there is a method of immediately pulling up the end of the plastic film so that the angle becomes 180 degrees and examining the interface where peeling occurs.

  In the present invention, a protective layer can be provided on the metal vapor-deposited film for the purpose of physical and chemical protection such as loss of the metal film due to abrasion and alteration due to oxidation of the metal under high humidity. Examples of the resin component that forms the protective layer include polyester resins, vinyl chloride resins, vinyl acetate resins, urethane resins, epoxy resins, melamine resins, and the like, and mixtures and copolymers thereof. However, any resin can be used as long as it is generally excellent in adhesion to a metal, and the present invention is not limited to this.

  The protective layer can be formed as a solution dissolved in a solvent or on an emulsion with a non-soluble solvent, by applying the coating using a commonly known coating apparatus and then drying.

  The thickness of the protective layer is preferably 0.5 μm or more and 10 μm or less, more preferably 0.5 μm or more and 5 μm or less, and particularly preferably 1 μm or more and 5 μm or less. If the thickness is less than 0.5 μm, chemical protection is insufficient, and if it exceeds 10 μm, the adhesion strength is reduced due to material destruction, which is not preferable.

  The metal vapor-deposited plastic film for labels of the present invention is further provided with an ink receiving layer on the opposite side of the metal vapor-deposited film layer, and on the metal vapor-deposited film layer side with a film coated with an adhesive layer and a release agent.・ Printed label.

  As the coating agent used for the ink receiving layer, conventionally known polyester resins, acrylic resins, urethane resins and the like can be used. The ink-receiving layer can be formed at any stage such as in-line coating during film formation, off-line coating after film formation, hairline processing, metal deposition, and the like.

  Moreover, a conventionally well-known thing can be used also about the film which apply | coated the adhesive and mold release agent which form an adhesion layer.

  Although the metal vapor-deposited plastic film for labels according to the present invention has a hairline surface, the adhesive between the metal vapor-deposited film and the plastic film is excellent when peeling off the label once pasted. It is characterized by being reduced.

  The metal-deposited plastic film for labels of the present invention will be described in detail with reference to examples.

Method for confirming peeling interface of metal vapor-deposited plastic film for label The metal vapor-deposited surface of a plastic film cut into a strip with a width of 10 mm was coated with an acrylic pressure-sensitive adhesive and dried to provide an adhesive layer of about 15 μm. Then, this test piece is affixed on an ABS resin plate, and rubbed back and forth twice while strongly pressing the test piece with a finger. Immediately thereafter, the end of the plastic film was pulled up to an angle of 180 degrees, and the interface where peeling occurred was examined.

(Example 1)
A plastic film having a total thickness of 50 μm formed by co-extrusion of a copolymer polyester resin layer composed of a 47 μm polyethylene terephthalate layer, 3 μm terephthalic acid and ethylene glycol / 1,4-cyclohexanedimethanol (50/50 mol%). Obtained. The copolyester resin surface is scratched by running a plastic film in contact with a polishing roll with 320th sandpaper affixed to a metal roll with no gaps, and a hairline with a maximum depth of 1.5 μm is applied. After that, metal aluminum was deposited in a thickness of about 500 angstroms by induction heating in vacuum. The obtained metal-deposited plastic film for label was subjected to adhesive processing and affixed to an ABS resin plate, and the peel interface was confirmed by the above method. As a result, the entire surface was peeled between the adhesive layer and the ABS resin plate.

(Example 2)
Copolymer polyester comprising terephthalic acid / isophthalic acid (60/40 mol%) and ethylene glycol instead of copolymer polyester resin layer comprising terephthalic acid and ethylene glycol / 1,4-cyclohexanedimethanol (50/50 mol%) A metal-deposited plastic film for labels was obtained in the same manner as in Example 1 except that the resin layer was used. Further, the peel interface was measured in the same manner as in Example 1. As a result, the entire surface was peeled between the adhesive layer and the ABS resin plate.

(Comparative Example 1)
A metal vapor-deposited plastic film was obtained in the same manner as in Example 1 except that a single 50 μm polyethylene terephthalate film having no copolymerized polyester resin layer was used. Furthermore, as a result of evaluating the peeling interface in the same manner as in Example 1, peeling partially occurred between the polyethylene terephthalate film and the metal vapor deposition film layer.

(Comparative Example 2)
Except for using a plastic film having a total thickness of 50 μm formed by coextrusion of a 47 μm polyethylene terephthalate layer and a 3 μm 2,6-naphthalenedicarboxylic acid and homopolyester resin layer made of ethylene glycol, the same procedure as in Example 1 was used. Thus, a metal-deposited plastic film was obtained. Furthermore, as a result of evaluating the peeling interface in the same manner as in Example 1, peeling partially occurred between the polyethylene terephthalate film and the metal vapor deposition film layer.

Claims (5)

A film with a hairline on one side of a plastic film and a metal vapor deposition film formed on it, with a copolymer polyester resin layer on one side of the film, and a hairline on the copolymer polyester resin layer Metal vapor deposition plastic film for labels. The label according to claim 1, wherein the copolyester resin layer is mainly composed of a copolyester resin selected from dicaribonic acid and diol components composed of terephthalic acid, isophthalic acid, ethylene glycol, and 1,4-cyclohexanedimethanol. Metal vapor deposited plastic film. The metal-deposited plastic film for labels according to claim 1 or 2, wherein the maximum depth of the hairline is 0.1 to 5 µm. 4. The metal vapor-deposited plastic film for labels according to claim 1, 2 or 3, further comprising a protective layer mainly composed of a thermoplastic polyester resin on the metal vapor-deposited film. The metal-deposited plastic film for a label according to claim 1, 2, 3 or 4, wherein a hairline is obtained by bringing the film into contact with a roll having a polishing file surface.