JP2002187387A - Forgery-proof film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forgery-proof film which makes a duplicate forged article easily distinguishable and is hardly creasable with a high printing adhesion. SOLUTION: The forgery-proof film is characterized in that one of the sides of a base material layer (A) containing a thermoplastic resin is treated for forgery proofness and a surface layer (B) containing the thermoplastic resin is formed on the side where the forgery-proofing treatment is applied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forgery prevention film which can be used for banknotes, bills, checks, traveler's checks, securities, cards and the like which are required to prevent forgery and tampering.

[0002]

2. Description of the Related Art In modern society, a large number of documents and cards, such as banknotes, checks, securities, and cards, which are prohibited from being forged or copied are circulated. These forgeries and copies are
What is technically impossible, rather than just prohibited by law, is needed to maintain social order. However, in recent years, with the remarkable progress of the copying technology and the copying technology, the danger of producing counterfeit products and copies is increasing year by year. In fact, counterfeit crime is increasing recently, and its technology is becoming more sophisticated.

Accordingly, various techniques for preventing forgery and duplication have been developed. For example, there is a technology that can detect forgery in appearance. Specifically, a technique for causing a fluorescent coloring substance to be present in a printed matter; a technique for printing using a magnetic ink so that a change in the density of the ink due to a magnetic action can be visually detected (Japanese Patent Laid-Open No. 5-177919).
Japanese Patent Application Laid-Open No. 60-79992; an ink having a specific reflection spectral characteristic, and a difference in reflectance of a specific value or more. A technique for printing using more than one kind of ink; a printed matter whose color changes when viewed from a certain angle (JP-A-5-177919); a printed matter provided with a watermark (latent image) -18078, and Japanese Utility Model Laid-Open No. 58-168457).

[0004] In addition, there have been developed prints which have been modified so that characters and designs are difficult to read when copied, or those in which warning marks appear on copy paper (Japanese Utility Model Laid-Open No. 59-64271). ). Furthermore, a printed matter printed using a special magnetic ink so that an error occurs when the copied matter is applied to the discriminator; the copied matter is printed in such a manner that the halftone dot difference of the printed matter of the copied matter is different from the original (genuine note). (Japanese Patent Publication No. 56-19273 and Japanese Patent Publication No. 2-51742); a character which cannot be read by the naked eye is printed, and a concealed character can be read by a discriminator. No. 62-130874).

[0005]

As described above, various countermeasures for preventing forgery have been developed. However, many of these originals can be duplicated in photolithography, and it is difficult to completely prevent counterfeiting. In addition, in many cases, wrinkles are generated especially when used like a genuine bill, and when it is set on a discriminator, it is determined to be "unusable" and returned. In view of these problems of the prior art, the present invention provides a forgery prevention film that can be easily distinguished from a copied counterfeit product, is less likely to wrinkle, and has excellent print adhesion. Was an issue.

[0006]

Means for Solving the Problems As a result of diligent studies, the present inventor has conducted a forgery prevention treatment on a base material layer containing a thermoplastic resin and laminated a layer containing a thermoplastic resin thereon. The present inventors have found that a forgery prevention film exhibiting an intended effect can be provided, and arrived at the present invention. That is, in the present invention, a forgery prevention treatment is performed on one surface of the base material layer (A) containing a thermoplastic resin, and the surface containing the thermoplastic resin is provided on the surface on which the forgery prevention treatment is performed. Provided is a film for preventing forgery, wherein the layer (B) is formed. The anti-counterfeit film of the present invention comprises a substrate layer (A)
The back surface layer (C) is preferably formed on the back surface of the base material layer. In particular, both sides of the base material layer (A) are subjected to forgery prevention treatment, and the surface layer (B) and the back surface layer ( C) is preferably formed. The forgery prevention treatment is preferably embossing or printing applied to the surface of the base material layer (A). The base material layer (A) may have a multilayer structure. The anti-counterfeit film of the present invention preferably has an opacity of 1 to 60%.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the anti-counterfeit film of the present invention will be described in detail. In this specification, “to” means a range including the numerical values described before and after it as a minimum value and a maximum value, respectively. The anti-counterfeit film of the present invention has a structure in which a surface layer (B) is formed on a base layer (A) subjected to anti-counterfeit treatment, and preferably further has a back layer (C). . Then, each layer which comprises the forgery prevention film of this invention is demonstrated in order, and also the manufacturing method and application are demonstrated.

Base material layer (A) Base material layer (A) constituting anti-counterfeit film of the present invention
Is a layer containing at least a thermoplastic resin. Examples of the thermoplastic resin used for the base layer (A) include ethylene resins such as high-density polyethylene, medium-density polyethylene, and low-density polyethylene, or propylene resins, polymethyl-1-pentene, and ethylene-cycloolefin copolymers. Such as polyolefin resins such as nylon-6, nylon-6,6, nylon-6,10, and nylon-6,12, polyamide-based resins, polyethylene terephthalate and copolymers thereof, polyethylene naphthalate, and aliphatic polyester. Thermoplastic polyester resin, polycarbonate, atactic polystyrene, syndiotactic polystyrene, thermoplastic resin such as polyphenylene sulfide, and the like. These may be used in combination of two or more. Among these, it is preferable to use a polyolefin resin. Further, among the polyolefin resins, it is more preferable to use a propylene resin or a high-density polyethylene from the viewpoint of cost, water resistance, and chemical resistance. Such propylene-based resins include isotactic or syndiotactic, propylene homopolymer (polypropylene) exhibiting various degrees of stereoregularity, propylene as a main component, and ethylene, 1-butene, 1-hexene. And a copolymer with an α-olefin such as 1-heptene and 4-methyl-1-pentene can be preferably used. These copolymers are
It may be a binary, ternary or quaternary system, and may be a random copolymer or a block copolymer.

In the base material layer (A), in addition to the thermoplastic resin,
It is preferable to mix an inorganic fine powder and / or an organic filler. As the inorganic fine powder, those having an average particle size of usually 0.01 to 15 μm, preferably 0.01 to 8 μm, and more preferably 0.03 to 4 μm can be used. Specifically, calcium carbonate, calcined clay, silica, diatomaceous earth, talc, titanium oxide, barium sulfate, alumina and the like can be used. As the organic filler, the average particle size after dispersion is usually 0.01 to 15 μm.
m, preferably 0.01 to 8 μm, more preferably 0.1 μm.
Those having a size of 03 to 4 μm can be used. As the organic filler, it is preferable to select a resin different from the thermoplastic resin as the main component. For example, when the thermoplastic resin is a polyolefin resin, as the organic filler, polyethylene terephthalate, polybutylene terephthalate, polycarbonate, nylon-6,
Nylon-6,6, homopolymer of cyclic olefin, copolymer of cyclic olefin and ethylene, etc., melting point of 120 ° C
~ 300 ° C or glass transition temperature 120 ° C ~ 28
It is preferable to use one at 0 ° C.

The base material layer (A) may further contain, if necessary, a stabilizer, a light stabilizer, a dispersant, a lubricant, a fluorescent brightener, a coloring agent and the like. As the stabilizer, for example, a sterically hindered phenol-based, phosphorus-based, amine-based stabilizer, etc.
1% by weight can be blended. As the light stabilizer, for example, a light stabilizer such as a sterically hindered amine, a benzotriazole type or a benzophenone type may be incorporated in an amount of 0.001 to 1% by weight. As the dispersant for the inorganic fine powder, for example, 0.01 to 4% by weight of a silane coupling agent, a higher fatty acid such as oleic acid or stearic acid, metal soap, polyacrylic acid, polymethacrylic acid or a salt thereof is blended. be able to. As the fluorescent whitening agent, for example, imidazole type, imidazolone type, triazole type, thiazole type, oxazole type, oxadiazole type, coumarin type, carbostyril type, thiadiazole type, naphthalimide type, pyrazolone type, and the like, specifically, 2.5-screw [5
-T-butylbenzooxazolyl (2)] thiophene,
Dicyclohexyl phthalate, 4-methoxynaphthalic acid-N-methylimide, diaminostilbenzylsulfonic acid derivative, diaminostilbene derivative, etc.
1% by weight can be blended. As the coloring agent, 5 to 30% by weight of color pellets colored with various pigments can be blended.

The substrate layer (A) constituting the anti-counterfeit film of the present invention may have a single-layer structure or a multilayer structure of two or more layers. Further, a part of the base material layer (A) or a layer constituting the base material layer (A) may be stretched at least in a uniaxial direction. The base material layer (A) is a layer (A
1), a layer (A2) and a layer (A3) [A1 / A2
/ A3], the thickness of (A1 + A3) is 1 μm
As described above, the ratio of the thickness of (A1 + A3) to the thickness of A2 is 1: 4.
It is preferably 0 to 1:10. The thickness of the base material layer (A) is preferably 25 to 100 μm, and 30 to 7 μm.
It is more preferably 5 μm, particularly preferably 40 to 60 μm.

Surface Layer (B) and Back Layer (C) A surface layer (B) is formed on one side of the base layer (A) constituting the anti-counterfeit film of the present invention. Further, it is preferable that a back surface layer (C) is formed on the surface opposite to the base material layer (A). Both the surface layer (B) and the back layer (C) contain a thermoplastic resin. Also,
The surface layer (B) and the back surface layer (C) may preferably contain an inorganic fine powder and / or an organic filler. As the thermoplastic resin, the inorganic fine powder, and the organic filler used for the surface layer (B) and the back layer (C), the same ones used for the base material layer (A) can be used. Further, the above-mentioned stabilizer, light stabilizer, dispersant, lubricant, fluorescent whitening agent, coloring agent and the like may be blended in the surface layer (B) and the back layer (C).

The surface layer (B) and the back layer (C) may each have a single-layer structure or a multilayer structure of two or more layers. The surface layer (B) and the back layer (C)
May be at least uniaxially stretched. The thickness of each of the surface layer (B) and the back layer (C) is preferably 5 to 50 μm, and is preferably 10 to 50 μm.
More preferably, it is 40 μm.

The forgery prevention film of the present invention preferably has a structure in which a surface layer (B) and a back surface layer (C) are formed on each surface of a base material layer (A). In particular, the base material layer (A) has a polyolefin resin content of 40 to 99.5% by weight, an inorganic fine powder and / or an organic filler 60 to
Anti-counterfeit film containing 0.5% by weight, and the front layer (B) and the back layer (C) each containing 25 to 100% by weight of a polyolefin resin, and 75 to 0% by weight of an inorganic fine powder and / or an organic filler. Is preferred. Further, the base layer (A) contains 50 to 97% by weight of a polyolefin-based resin and 50 to 3% by weight of an inorganic fine powder and / or an organic filler, and the surface layer (B) and the back layer (C) are made of a polyolefin-based resin. 30-97% by weight, inorganic fine powder 70-3% by weight
Is more preferable.

When the amount of the inorganic fine powder and / or the organic filler contained in the base material layer (A) exceeds 60% by weight, the stretched resin film tends to be easily broken during the transverse stretching performed after the longitudinal stretching. The surface layer (B) and the back layer (C)
If the amount of the inorganic fine powder and / or the organic filler is more than 75% by weight, the surface strength of the surface layer (B) after the transverse stretching is low, and the surface layer (B) due to mechanical shock during use or the like.
Tends to break easily.

The anti-counterfeit film of the present invention is formed between the substrate layer (A) and the surface layer (B), between the substrate layer (A) and the back layer (C), and on the surface layer (B). On the back layer (C), another layer may be provided.

Anti-counterfeiting treatment One or both sides of the substrate layer (A) constituting the anti-counterfeiting film of the present invention are subjected to anti-counterfeiting treatment. The anti-counterfeit treatment may be one in which the surface of the base material layer (A) is directly processed, or one in which a layer subjected to the forgery prevention treatment is formed on the base material layer (A). Is also good. Preferred is an embodiment in which the surface of the base material layer (A) is embossed or printed.

Examples of the embossing method include a method of shaping the embossed plate by heat and pressure using various known presses such as a lithographic press and a roll embossing machine, and an embossing machine. The roll embossing method is a method of shaping a concave / convex shape of a cylindrical embossing plate on a target material by hot pressure. Specifically, for example, the base material layer (A) is extruded into a film in a molten state using a single-layer or multilayer T-die or I-die connected to an extruder,
Next, when the film is formed by cooling with a cooling roll, the embossing roll is pressed against the surface of the film to shape the film, and then cooled to fix the shape. Further, even after cooling the first layer (A), stamping and shaping can be performed with a heating roll. At this time, the film portion in contact with the convex portion of the embossing roll becomes white during stretching. Further, by spraying water on the cooling film by spraying or the like, the film portion with water droplets is rapidly cooled and whitened at the time of stretching.

The printing performed for the forgery prevention processing includes:
Various printing methods such as a fusion heat transfer, an electrophotographic method, and an ink jet can be applied. In particular, when printing with wax or resin type ink used in the melt heat transfer method, first transfer the image to a film with weak ink adhesion, and use a heating roll etc. from the back side of the printing surface of this film to unstretch. Image transfer is possible by thermocompression bonding to a film. Therefore, according to this method, it is not necessary to install a printing device on the molding line. The anti-counterfeit treatment by printing is preferably performed in an unstretched state before stretching the base material layer (A). When the base material layer (A) is uniaxially stretched, printing is performed before longitudinal stretching, and when biaxially stretching, printing is performed before longitudinal stretching or horizontal stretching.

The anti-counterfeiting treatment referred to in the present specification is an anti-counterfeiting treatment between the base material layer (A) and the surface layer (B) and between the base material layer (A) and the back surface layer (C). An embodiment in which the layer is sandwiched is also included. Examples of the layer subjected to the forgery prevention treatment include a printed layer. The layer subjected to such anti-counterfeit treatment is laminated, for example, after stretching the base material layer (A), and sandwiched by forming a surface layer (B) or a back surface layer (C) thereon. Can be.
For example, when preparing a forgery prevention film composed of a uniaxially stretched surface layer (B) / a biaxially stretched base layer (A) / a uniaxially stretched back layer (C), the longitudinal stretching of the layer (A) Immediately before the lamination of the layer (B), a film (D) which has been printed in advance is inserted and (B) /
(D) / (A) / (D) / (B) or (B) /
A (D) / (A) / (B) laminate can be used as a forgery prevention film.

The printed film (D) is an unstretched film,
A uniaxially stretched film, a biaxially stretched film, or a laminate thereof may be used, but a uniaxially stretched film is more preferable from the viewpoint of suppressing an increase in transverse stretching stress in a later step. Also,
Printing methods include electrophotography, fusion heat transfer, rewritable marking, and inkjet printers, as well as letterpress printing, gravure printing, flexographic printing, solvent-based offset printing, ultraviolet curable offset printing, offset, flexographic, and gravure printing. ,screen,
Various printing methods such as inkjet, electrophotography, and heat transfer can be applied. These printed images are preferably images reduced by a factor of 1 / (stretching ratio) in consideration of the stretching ratio in the subsequent process.

The anti-counterfeit film of the present invention can be further heat-engraved to prevent forgery. If the opacity of the anti-counterfeiting film of the present invention is as low as 1 to 60%, the pressurized portion of the processed portion becomes less translucent and becomes translucent or transparent when the heat stamping is performed. Since the parts other than the pressurizing part at the time of heating and engraving remain original translucent, when watermarking is performed on a light source such as sunlight or a fluorescent lamp, a clear engraving is obtained, and it is possible to judge at a glance whether or not forgery has occurred. However, in the case of a completely transparent film, it tends to be indistinct, making it difficult to judge at first glance whether it is a forgery. In the case of an opaque film, the suitability for thermal engraving is good, but forgery using a copying machine tends to be easy. Therefore, the anti-counterfeit film of the present invention obtained by stamping a film having an opacity within the above range by heating is particularly preferable.

When a large amount of the inorganic fine powder and / or the organic filler is contained, if the engraving pressure is applied at room temperature, the voids contained in the film are crushed and the pressurized portion becomes opaque, contrary to the heating and engraving. And the original translucent portion remains except for the pressing portion. For this reason, a clear engraving can be obtained, and it can be determined at a glance whether or not forgery has occurred. These heating or engraving at room temperature not only has the above-mentioned counterfeit prevention effect, but also enables people with vision impairment to easily determine the type of banknotes, etc. with only the sense of a fingertip. It is.

The anti-counterfeiting film of the present invention may be selected from one of the anti-counterfeiting treatment methods described above.
Two or more may be selected and combined. If one is selected and applied, an advanced anti-counterfeiting effect can be provided at a lower cost. Further, if two or more are selected and applied in combination, the forgery prevention effect can be further enhanced.

Production and Processing of Anti-Counterfeit Film The anti-counterfeit film of the present invention can be produced by combining various methods known to those skilled in the art. A forgery prevention film produced by any method is included in the scope of the present invention as long as it satisfies the conditions described in claim 1. As a typical production method, there can be mentioned a method in which a layer constituting the forgery prevention film is formed and then stretched. The molding method is not particularly limited, and various known methods can be used. Concretely, cast molding, calender molding, rolling molding, inflation molding, and thermoplastic resin are used to extrude a molten resin into a film using a single-layer or multilayer T-die or I-die connected to a screw type extruder. Molding can be performed by removing a solvent or oil after casting or calendering a mixture with an organic solvent or oil, molding from a solution of a thermoplastic resin and removing the solvent.

The stretching method is not particularly limited, and various known methods can be used. Specific examples of the stretching method include inter-roll stretching using a peripheral speed difference between roll groups, and clip stretching using a tenter oven. More specifically, longitudinal stretching using the peripheral speed difference of the roll group, transverse stretching using a tenter oven, rolling,
Simultaneous biaxial stretching using a combination of a tenter oven and a linear motor can be used. The stretching of each layer may be uniaxial stretching or biaxial or more stretching.
For example, when producing a film having a three-layer structure of the surface layer (B) / base layer (A) / backside layer (C), the number of stretching axes of each layer is set to uniaxial / biaxial / uniaxial, uniaxial / uniaxial / Arbitrary combinations such as uniaxial, biaxial / biaxial / biaxial, and the like are possible.

The stretching ratio is not particularly limited, and is appropriately selected depending on the purpose and the characteristics of the thermoplastic resin used. For example,
When using a propylene homopolymer or a copolymer thereof as the thermoplastic resin, when uniaxially stretching, about 1.2 to
12 times is preferable, 2 to 10 times is more preferable, and when biaxial stretching is performed, the area ratio is preferably 1.5 to 60 times, preferably 1 to 60 times.
0 to 50 times is more preferable. When using other thermoplastic resins, when uniaxially stretching, it is preferably 1.2 to 10 times, more preferably 2 to 5 times, and when biaxially stretching, it is preferably 1.5 to 20 times by area magnification, preferably 4 to 20 times. -12 times is more preferable. Furthermore, heat treatment at a high temperature can be performed as necessary.

The stretching is carried out in a suitable known temperature range from the glass transition temperature of the amorphous resin to the glass transition temperature of the amorphous portion to the melting point of the crystalline portion. it can. Generally, stretching is preferably performed at a temperature 2 to 60 ° C. lower than the melting point of the thermoplastic resin used. When a propylene homopolymer (melting point: 155 to 167 ° C.) is used as the thermoplastic resin, 152 to 16
4 ° C., 110-120 ° C. when using high-density polyethylene (melting point 121-134 ° C.), 104 when using polyethylene terephthalate (melting point 246-252 ° C.)
It is preferred to stretch at ~ 115 ° C. The stretching speed is preferably set to 20 to 350 m / min.

The order of stretching and lamination of each layer constituting the anti-counterfeit film of the present invention is not particularly limited. For example, it may be manufactured by separately stretching the base material layer (A) and the surface layer (B) and then laminating them, or may be stretched collectively after the base material layer (A) and the surface layer (B) are laminated. It may be manufactured by doing. When the back layer (C) is provided, the three layers may be separately stretched and laminated, or may be laminated first and then stretched together, or the base layer (A) and the back surface After laminating and stretching the layer (C),
It may be manufactured by laminating a stretched or unstretched surface layer (B). These methods can be appropriately combined. A preferred manufacturing method includes a step of laminating a plurality of layers and then stretching them together. Compared to the case of separately stretching and laminating, it is simpler and the cost is lower.

When the layer contains an inorganic fine powder and / or an organic filler, fine cracks are generated on the film surface by stretching, and fine holes are generated inside the film. The anti-counterfeit film of the present invention after stretching has a porosity of preferably 1 to 20%, more preferably 2 to 10%. If it exceeds 20%, the opacity tends to be too high to be unsuitable as a forgery prevention film.

The porosity is calculated by the following equation.

(Equation 1) In the formula (1), ρ ₀ represents the true density of the stretched film, and ρ represents the density of the stretched film (JIS P-8118).
Unless the material before stretching contains a lot of air,
The true density is almost equal to the density before stretching.

In order to prevent the thermoplastic resin layer constituting the outermost layer of the anti-counterfeit film of the present invention from being charged and to improve various printing suitability, it is preferable to carry out a surface treatment after the lamination structure is formed to modify the surface. . As a method of surface treatment,
A combination of a surface oxidation treatment and a treatment with a surface treatment agent can be given. As the surface oxidation treatment, a corona discharge treatment, a flame treatment, a plasma treatment, a glow discharge treatment, an ozone treatment and the like generally used for a film can be performed alone or in combination. Among these, corona processing and frame processing are preferable. The throughput of the corona treatment is 600 to 12,000 J / m ² (10 to
200 W · min / m ² ), preferably 1,20
More preferably, it is 0 to 9,000 J / m ² (20 to 180 W · min / m ² ). For frame processing,
It is preferably 000~200,000J / m ^2, and more preferably 20,000~100,000J / m ^2.

The surface treatment agent is selected mainly from the following primers and antistatic polymers, and may be a single agent or a mixture of two or more components. From the viewpoint of improving adhesion and preventing static electricity during dry lamination,
Preferred as a surface treatment agent is a primer or a combination of a primer and an antistatic polymer.

Examples of the primer constituting the surface treatment agent include polyethyleneimine, alkyl-modified polyethyleneimine having 1 to 12 carbon atoms, poly (ethyleneimine-urea) and an ethyleneimine adduct of polyamine polyamide, and epichlorohydrin addition of polyamine polyamide. Products, such as polyethyleneimine polymers, acrylic acid amide-acrylic acid ester copolymers, acrylic acid amide-acrylic acid ester-methacrylic acid ester copolymers, polyacrylamide derivatives, oxazoline group-containing acrylic acid ester-based polymers, Acrylic ester-based polymers such as polyacrylates, water-soluble resins such as polyvinylpyrrolidone, polyethylene glycol and polyvinyl alcohol; and polyvinyl acetate, polyurethane, ethylene-vinyl acetate Polymers, polyvinylidene chloride, chlorinated polypropylene, acrylonitrile - butadiene copolymer water-dispersible resins such as are used.

Of these, preferred are polyethyleneimine-based polymers, urethane resins, polyacrylates, etc., more preferred are polyethyleneimine-based polymers, and further preferred are those having a degree of polymerization of from 20 to 3,000.
Or an ethyleneimine adduct of polyamine polyamide, or a modified polyethyleneimine obtained by modifying these with an alkyl halide, alkenyl halide, cycloalkyl halide or benzyl halide group having 1 to 24 carbon atoms.

The antistatic polymer constituting the surface treating agent includes a cationic polymer, an anionic polymer and an amphoteric polymer. Examples of the cationic polymer include a polymer having a quaternary ammonium salt structure or a phosphonium salt structure, a nitrogen-containing acrylic polymer, and an acrylic or methacrylic polymer having nitrogen having a quaternary ammonium salt structure. Examples of the amphoteric polymer include an acrylic or methacrylic polymer having a betaine structure of nitrogen. Examples of the cationic polymer include a styrene-maleic anhydride copolymer or an alkali metal salt thereof, an alkali metal salt of an ethylene-acrylic acid copolymer or an alkali metal salt of an ethylene-methacrylic acid copolymer. Particularly preferred are acrylic or methacrylic polymers having nitrogen having a quaternary ammonium salt structure. The molecular weight of the antistatic polymer can be set to an arbitrary level depending on polymerization conditions such as polymerization temperature, type and amount of polymerization initiator, amount of solvent used, and chain transfer agent. The molecular weight of the obtained polymer is generally from 1,000 to 1,000,000, but preferably from 1,000 to 500,000.

The surface treating agent used in the present invention may contain a crosslinking agent, an alkali metal salt or an alkaline earth metal salt, if necessary. By adding a crosslinking agent to the surface treatment agent, the coating film strength and water resistance can be further improved. As a crosslinking agent, glycidyl ether,
Examples include epoxy-based compounds such as glycidyl esters, epoxy resins, and water-dispersible resins such as isocyanate-based, oxazoline-based, formalin-based, and hydrazide-based resins. The amount of the cross-linking agent to be added is usually within a range of 100 parts by weight or less based on 100 parts by weight of the active ingredient excluding the solvent of the surface modifier.

As the alkali metal salt or alkaline earth metal salt used in the surface treatment agent, water-soluble inorganic salts, for example,
Sodium carbonate, sodium bicarbonate, potassium carbonate,
Examples include sodium sulfite, other alkaline salts, and sodium chloride, sodium sulfate, sodium nitrate, sodium tripolyphosphate, sodium pyrophosphate, ammonium alum and the like. The amount of addition is usually 50 parts by weight or less based on 100 parts by weight of the active ingredient excluding the solvent of the surface modifier. Further, the surface modifier may include a surfactant, an antifoaming agent, a water-soluble or water-dispersible fine powder substance, and other auxiliaries. The amount of these optional components is usually the amount of the active component 1 excluding the solvent of the above-mentioned surface modifier.
20 parts by weight or less with respect to 00 parts by weight.

Each component of these surface treating agents can be used after being dissolved in water or a hydrophilic solvent such as methyl alcohol, ethyl alcohol and isopropyl alcohol. Above all, it is typically used in the form of an aqueous solution. The solution concentration is usually about 0.1 to 20% by weight, preferably about 0.1 to 10% by weight. Coating method is roll coater, blade coater, bar coater, air knife coater, size press coater, gravure coater,
It is performed by a reverse coater, a die coater, a lip coater, a spray coater, or the like, and if necessary, smoothing is performed or an excess water or hydrophilic solvent is removed through a drying step. Coating amount is 0.00% as solid content after drying.
It is 5 to 5 g / m ² , preferably 0.01 to ² g / m ² . The timing of the surface treatment may be before or after longitudinal or transverse stretching. The surface treatment agent may be applied in one step or in multiple steps.

After performing these surface treatments, if necessary, the surface can be provided with a writability-imparting layer, a print quality improving layer, a heat transfer receiving layer, a heat-sensitive recording layer, an ink jet receiving layer, or the like as a surface treatment agent. It can be provided by a method similar to the method.

The anti-counterfeiting film of the present invention thus obtained can be provided with a recording layer on the surface of the surface layer (B) or the back layer (C). This recording layer includes electrophotographic, sublimation heat transfer, melt heat transfer, direct thermal, rewritable marking, and printing using an inkjet printer, as well as letterpress printing, gravure printing, flexo printing, solvent type offset printing, and ultraviolet curing. Roll offset printing in the form of rolls can also be performed in the form of mold offset printing or film.

Application of the anti-counterfeiting film of the present invention The physical properties of the anti-counterfeiting film of the present invention can be appropriately adjusted according to the purpose of use, environment of use and the like. Opacity of anti-counterfeit film of the present invention (JIS P813
8) is preferably 1 to 60%, and 5 to 55%
Is more preferable, and 15 to 50% is particularly preferable. When the opacity exceeds 60%, whitening stripes and printing due to embossing performed on the base material layer (A) are not clearly seen, and the anti-counterfeiting property tends to decrease. Further, the whiteness (JIS L) of the anti-counterfeiting film of the present invention.
1015) is preferably from 60 to 100%,
More preferably, it is 70 to 100%. When the whiteness is out of this range, characters and images printed on the front layer (B) and the back layer (C) become unclear and difficult to identify,
Also, the appearance tends to be unfavorable. Further, the thickness of the forgery prevention film of the present invention is 50 to 200 μm.
Is preferably 60 to 150 μm, more preferably 80 to 120 μm. When the thickness is less than 50 μm, the strength is insufficient and the durability is inferior. When the thickness is more than 200 μm, for example, banknotes (banknotes) tend to be too stiff and difficult to handle. These properties can be adjusted by appropriately combining known methods.

The anti-counterfeit film of the present invention has an advantage that the anti-counterfeit film is subjected to anti-counterfeit treatment so that it can be easily recognized as a copy when copied.
For example, a genuine bill prepared using the anti-counterfeiting film of the present invention, which has been subjected to anti-counterfeiting by embossing, is prepared using a silver halide photographic paper, a thermal transfer image receiving paper, an OHP sheet made of a polyethylene terephthalate biaxially stretched film or the like. If the copy holding cover of the copying machine is made of an aluminum plate, the translucent portion of the genuine bill is printed in blue and black in the copy. Therefore, by comparing the genuine bill and the translucent portion of the copy visually, the two can be easily distinguished. Also, the copy press lid of the copier is a white plastic plate,
In the case of cloth or white cardboard, the base material pattern in the watermark portion of the genuine bill becomes the color of the paper on the copy paper and disappears, and becomes transparent on the copied OHP film and disappears. . For this reason, if the presence or absence of the base material pattern is confirmed by visually comparing the genuine bill and the watermark portion of the copy, the two can be easily distinguished.

When a genuine bill produced by using the forgery prevention film of the present invention, which has been subjected to printing forgery prevention, is copied, the contrast of the copied image of the printed portion of the genuine bill changes greatly, so that the image is not copied. It becomes fuzzy and the density is low.
For this reason, by comparing the clarity of the image of the genuine bill with the sharpness of the image of the copy, the two can be easily distinguished. In order to ensure the anti-counterfeiting effect of the anti-counterfeiting film of the present invention, it is preferable to intentionally provide a portion (watermark portion) where no printing is performed on the recording layer or the like.

The forgery prevention film of the present invention can be widely applied to films for which forgery prevention is required. For example, banknotes, bills, checks, travelers checks,
Lotteries, gift certificates, stock certificates, other securities, various cards, admission tickets, tickets, ID cards, driver's licenses, resident certificates,
Family register, seal certificate, passport, visa, deposit certificate,
It can be applied to pledge setting documents. In particular, when a banknote is manufactured using the forgery prevention film of the present invention,
The appearance looks just like a conventional banknote, and does not give a sense of incongruity.
In addition, it has excellent water resistance and durability, and can be used in various applications.

[0046]

The features of the present invention will be described more specifically with reference to the following examples. Material, amount used in the following examples,
The ratio, processing content, processing procedure, and the like can be appropriately changed without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited by the specific examples described below.

<Example 1> Melt flow rate (MF)
R) 3 parts by weight of heavy calcium carbonate having an average particle size of 3 μm with respect to 87 parts by weight of a propylene homopolymer of 4 g / 10 minutes;
3-methyl-2,6-di-t- is based on 10 parts by weight of high-density polyethylene having an MFR of 10 g / 10 min and 100 parts by weight of a total amount of propylene homopolymer and heavy calcium carbonate.
0.05 parts by weight of butylphenol and a phenolic stabilizer (Irganox 1010, manufactured by Ciba-Gaiky)
0.08 parts by weight and 0.05 parts by weight of a phosphorus-based stabilizer (trade name: Weston 618, manufactured by GE Plastics Co., Ltd.) were blended to obtain a composition (A). 25 parts of this composition (A)
After kneading with an extruder set at 0 ° C., the mixture was extruded from a T-die connected to an extruder set at 230 ° C. to a mirror-like cast roll, and the back surface was cooled with a cooling device.
A herringbone pattern was embossed with a 0.5 mm deep embossing roll heated to 0 ° C. to obtain a non-stretched film. This film was heated to 160 ° C. and stretched 4.6 times in the machine direction by a longitudinal stretching machine composed of rolls having different peripheral speeds.

On the other hand, the composition (B) and the composition (C) having the same composition as the composition (A) were melt-kneaded with an extruder set at 240 ° C., and the composition (A) obtained above was mixed. The three-layer laminate (B / A / C) was obtained by extrusion lamination on both sides of the stretched film.

The resulting three-layer laminate was heated to 160 ° C. in a tenter oven and stretched 9 times in the transverse direction. Then, it passed through the heat setting zone (set temperature: 165 ° C.) following the tenter oven. Corona discharge treatment was performed on both surfaces of the film at an applied energy density of 90 W · min / m ² , and butyl-modified polyethyleneimine, an ethyleneimine adduct of polyamine polyamide, and
Aqueous solution containing an equal mixture of alkyl acrylate polymers having a quaternary ammonium salt structure, using a roll coater, the coating amount after drying is about 0.1 g per side
/ M ² and dried. The thickness (B / A / C) of each layer of the obtained three-layer laminated film was 25 μm /
It was 50 μm / 25 μm. The obtained anti-counterfeit film has a regular pattern of whitening stripes derived from embossing between the base layer (A) and the surface layer (B) and between the base layer (A) and the back layer (C). Had. The opacity, whiteness, and porosity of the forgery prevention film were as shown in Table 1.

On both sides of the obtained film, POP / K black offset printing ink of Dainippon Ink and Chemicals, Inc.
The pattern was printed using POP / K indigo, POP / K red, and POP / K yellow. At this time, 20 mm
The unprinted part of the circle was left. Using a color copying machine (Fuji Xerox Co., Ltd., Docu Color 1250)
The above forgery prevention film was color-copied as copy base paper. As an object to be copied, pulp paper and an OHP film made of a polyethylene terephthalate biaxially stretched film were used, and it was evaluated whether or not whitening stripes at the watermark portion were copied according to the following criteria. The results are shown in Table 1. ：: Undefined whitening stripes at the watermark portion are not copied. When pulp paper is used for the subject, the watermark part remains white,
In the case of an OHP film, the watermark portion remains transparent. X: The irregular whitening stripe at the watermark portion is copied.

Further, an attempt was made to copy a copy base paper by a color copier using the above-described forgery prevention film as a copy subject. As a result, it was confirmed that it was difficult to pass the forgery prevention film (paper cannot be passed) due to the heat of the transfer roll, and color copying was not possible.

Example 2 The composition (A) was kneaded with an extruder set at 250 ° C. in the same manner as in Example 1, and then kneaded.
It was extruded from a T-die connected to an extruder set at 30 ° C. into a mirror-like cast roll, and the back surface was cooled by a cooling device to obtain a non-stretched film. This film was heated to a temperature of 160 ° C., sprayed with water by a device installed near a roll just before longitudinal stretching, and stretched 4.2 times in the longitudinal direction by rolls having different peripheral speeds. Hereinafter, the same operation as in Example 1 is performed, and the thickness 90
A three-layer laminated film of μm was obtained. The thickness (B / A / C) of each layer of the obtained three-layer laminated film was 20 μm / 50 μm.
m / 20 μm. The obtained anti-counterfeit film had irregular whitening stripes between the substrate layer (A) and the surface layer (B) and between the substrate layer (A) and the back layer (C). . The opacity, whiteness, and porosity of the forgery prevention film were as shown in Table 1. Table 1 shows the results of the same anti-counterfeiting evaluation as in Example 1.

<Example 3> The same composition (A) as in Example 1
An ethylene-propylene copolymer (b) having an MFR of 4 g / 10 min and a melting point of 137 ° C. (DSC peak temperature);
A metallocene polyethylene (c) having an FR of 4 g / 10 min, a density of 0.91 g / cm ³ and a melting point of 110 ° C. (DSC peak temperature) was connected to an extruder set at 230 ° C.
It was co-extruded from a die to obtain a three-layer laminate of (b) / (A) / (c). This laminate was heated to 155 ° C., stretched 4.6 times in the longitudinal direction by a longitudinal stretching machine composed of rolls having different peripheral speeds, and then wound into a roll. Thus, a uniaxially stretched film (D) having a thickness of 50 μm and an opacity of 20%
I got On the (b) side of the roll film (D),
TEC Onsite Color Printer CB-418-T
In step 1, an image reduced 1/9 times in the direction perpendicular to the stretching direction was printed.

On the other hand, separately from this, the composition (A) was kneaded with an extruder set at 250 ° C. in the same manner as in Example 1, and then mirror-shaped from a T-die connected to an extruder set at 230 ° C. It was extruded into a cast roll, and the back surface was cooled by a cooling device to obtain a non-stretched film. 155 ° C
, And stretched 4.6 times in the machine direction by a machine for stretching composed of rolls having different peripheral speeds to obtain a vertically stretched film of the composition (A).

The uniaxially stretched film (D) obtained above is superposed such that the (c) side of the film is in contact with the longitudinally stretched film of the composition (A) (the uniaxially stretched film (D) is unwound from a roll and supplied). A composition (B) and a composition (C) having the same composition as in Example 1 were extruded on both sides of the obtained two-layer laminate (D / A) with an extruder set at 240 ° C. (B / D / A / C) was obtained.

The obtained four-layer laminate was heated at 160 ° C. in a tenter oven and stretched 9 times in the transverse direction. Then, it passed through a heat setting zone (set temperature: 165 ° C.) following the tenter oven to obtain a four-layer laminated film having a thickness of 110 μm. The thickness of each layer (B /
D / A / C) is 25 μm / 5 μm / 55 μm / 25 μm
m. The obtained film had a forgery prevention layer (D) printed between the base material layer (A) and the surface layer (B).
The opacity, whiteness, and porosity of the forgery prevention film were as shown in Table 1.

The film obtained in Example 3 was subjected to the same anti-counterfeiting evaluation test as in Example 1. However,
The following criteria were used to evaluate whether whitening stripes in the watermark were copied. The results are shown in Table 1. ：: The internal printing part of the watermark part becomes unclear and different from the copy base paper. X: The internal printing portion of the watermark portion is clear and cannot be distinguished from the copy base paper.

Further, an attempt was made to copy to a copy base paper by a color copying machine using the forgery prevention film as a copy subject. As a result, it was confirmed that it was difficult to pass the forgery prevention film (paper cannot be passed) due to the heat of the transfer roll, and color copying was not possible.

[0059]

[Table 1]

[0060]

As is clear from Table 1, when the anti-counterfeit film of the present invention is copied, the brightness or contrast of the identification pattern changes, so that it is possible to easily distinguish the copy from the genuine one. is there. Further, the anti-counterfeiting film of the present invention is less likely to wrinkle, and is excellent in printability and watermark, so that it can be suitably used for banknotes, securities, secret documents, and the like.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takahiko Ueda 23rd Towada, Kamisu-cho, Kashima-gun, Ibaraki Prefecture F-term in Yupo Corporation Kashima Plant (reference) 2H113 AA05 BA05 BB08 CA39 CA40 DA47 DA60 FA04 4F100 AA08 AK01C AK01E AK05 AK07 AR00B AR00D AT00A BA03 BA07 BA10A BA10C BA10E DE01 EH17 EJ37 EJ38 EJ39B EJ39D EJ40 GB71 HB31L JBJBJBJBJBJBJBJBJL

Claims (7)

[Claims] 1. A substrate containing a thermoplastic resin (A) is provided with a forgery prevention treatment on one side, and a surface containing a thermoplastic resin is provided on the surface on which the forgery prevention treatment is given. A forgery prevention film, wherein the layer (B) is formed. 2. A backside layer (C) on the backside of the base layer (A).
The anti-counterfeiting film according to claim 1, wherein a film is formed. 3. A forgery prevention treatment is performed on both surfaces of the base material layer (A), and a surface layer (B) and a back surface layer (C) are formed on each surface on which the forgery prevention treatment is performed. 3. The forgery prevention film according to claim 2, wherein each of the films is formed. 4. The forgery prevention film according to claim 1, wherein the forgery prevention treatment is embossing. 5. The forgery prevention film according to claim 1, wherein the forgery prevention processing is printing. 6. The forgery prevention film according to claim 1, wherein the base material layer (A) has a multilayer structure. 7. The forgery prevention film according to claim 1, wherein the opacity is 1 to 60%.