JP2003306896A - Thread for forgery preventive paper and forgery preventing paper sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide threads for forgery preventive paper that do not cause thread breakage and yield drop when these threads are subjected to papermaking, and show excellent adhesion to the paper layers without deterioration of adhesion with the passage of time, and provide forgery preventive paper by using the same. <P>SOLUTION: In the threads having one or more layers of adhesive on one surface or both surfaces of the base material, the surface adhesive layer on at least one face contains spherical particles in an amount of 0.2-20 solid mass %. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thread for anti-counterfeit paper and anti-counterfeit paper. More specifically, the present invention relates to an anti-counterfeit paper in which a thread-like or tape-like thread is made into a paper layer or attached to the surface of the paper layer to prevent forgery.

[0002]

2. Description of the Related Art In recent years, due to the progress of copying machine technology, forgery of securities has become easy and has become a big social problem. Therefore, banknotes, gift certificates, checks, stock certificates, passports, identification cards, cards, etc. Various anti-counterfeiting measures are taken to prevent unauthorized alteration or forgery.

As a countermeasure against forgery, Japanese Patent Laid-Open No. 48-75 is available.
As described in Japanese Patent Publication No. 808, Japanese Patent Publication No. 52-48660, Japanese Patent Publication No. 51-130308, and the like,
For example, it is possible to use an anti-counterfeit paper, which is a so-called thread-containing paper, in which a thread-like material (called a thread) is made into a paper layer.

The shape of the thread to be made into the paper layer is generally from 0.2 to 30 mm with a thickness of about 10 to 100 μm.
A thread-like or tape-like material having a width of a certain extent is used.
Recently, holograms, pixelgrams, etc.
Grating images and the like are attached to credit cards, banknotes, and the like, and metal vapor deposition films to which these are applied are also used as threads. The anti-counterfeit paper that incorporates these threads cannot easily be counterfeited because the metallic luster portion of the threads cannot be forged even when copied with a copying machine.

[0005] In such a thread that has been made into the paper layer, it is necessary to firmly adhere the thread and the paper layer in order to prevent the thread from falling off. Therefore, a method is used in which an adhesive is applied to one side or both sides of the thread to adhere it to the paper layer.

In the production of threads, it is difficult to uniformly apply the adhesive to a thread or tape having a narrow width. After applying the adhesive evenly to a width of about 100 mm to 1500 mm, a micro slitter, etc. 0.2m
It is slit into a width of about m to 30 mm and wound up. However, the thread to which the adhesive is applied has a problem that slippage between the front and back of the thread is poor in the process of slitting and winding, and wrinkles are likely to occur. Also,
When a bobbin-shaped roll having a length of 10,000 to 25,000 m is wound, if the slippage between the front and back of the thread is poor, it becomes difficult to wind the thread uniformly in the width direction of the roll, and a drop occurs on both sides. Non-uniform winding with dents on both sides causes a thread breakage when a thread-shaped or tape-shaped thread is paid out between the paper layers, causing a reduction in yield and a problem that workability is significantly reduced. .

Further, when a thread base material having a metal vapor deposition layer is used, it is necessary to use an adhesive agent which is well adhered to the metal vapor deposition layer so as not to separate at the interface between the metal vapor deposition layer and the adhesive layer. Adhesion with good adhesion to the vapor-deposited surface requires the use of an adhesive with a high tensile elongation, but when such an adhesive is used, the slipperiness between the front and back of the thread and each guide is significantly reduced. However, there is a problem that workability is significantly deteriorated.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to provide a thread for anti-counterfeit paper and an anti-counterfeit paper, and more specifically, when the thread is cut into a paper layer, a thread breakage or a thread breakage occurs. Without lowering the yield,
It is an object of the present invention to provide a thread having excellent adhesive strength with a paper layer and having a lower adhesive strength over time, and a forgery prevention paper using the thread.

[0009]

The present invention includes the following inventions. (1) In a thread in which one or more adhesive layers are provided on one side or both sides of a substrate, at least one surface adhesive layer is
A thread containing 0.2 to 20 solid mass% of spherical particles.

(2) The spherical particles have a cumulative mass 50% particle diameter measured by a laser diffraction particle size distribution which is 0.5 to 3.0 times the surface adhesive layer thickness (1).
Thread as described in section.

(3) The spherical particles are spherical particles having a particle size distribution such that the value of cumulative mass 90% particle diameter / cumulative mass 10% particle diameter is 3.0 or less (1) or ( Thread according to item 2).

(4) Any one of the above items (1) to (3)
An anti-counterfeit paper in which the thread described in the item is incorporated between the paper layers.

The present invention further includes the following inventions. (5) The thread or anti-counterfeit paper according to any one of (1) to (4), wherein the spherical particles are at least one selected from silica, light calcium carbonate, magnesium carbonate, plastic particles, and starch.

(6) The coefficient of static friction between the front and back of the thread is 0.
The thread or anti-counterfeit paper according to any one of (1) to (5), which is 1 to 1.8.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The thread of the present invention is a thread in which one or more adhesive layers are provided on one side or both sides of a base material, and at least one surface adhesive layer has spherical particles of 0.
It is a thread containing 2 to 20% by mass of solids, preferably 1.0 to 10% by mass of solids. "Providing one or more adhesive layers on one side or both sides of the base material" means that when two or more adhesive layers are laminated on one side of the thread base material, one layer is provided on each side of the base material, or a plurality of layers are provided. including. The “surface adhesive layer” refers to the outermost adhesive layer.

In the present specification, the term "% by mass of solids" refers to the ratio with respect to 100 parts by mass of solids. In this specification,
The term "thread" is sometimes used to mean a wide width before slitter in which an adhesive is applied to a thread base material and a narrow width cut by a slitter. In the present specification, "threading is made into a paper layer"
The term "to be used" is meant to include a case where the paper is sandwiched between the paper layers of the multi-layer paper and a case where the paper is attached to the surface of the paper layer of the multi-layer paper. Therefore, the structure of "anti-counterfeit paper in which threads are made in the paper layer" is as follows: anti-counterfeit paper with all threads exposed, anti-counterfeit paper with partially exposed threads, anti-counterfeit paper that is not exposed at all. It is one of the papers, and the structure of the exposed part is, for example, adhesive layer / base material / adhesive layer / paper layer, and the structure of the unexposed part is paper layer / adhesive layer It may have a structure such as / substrate / adhesive layer / paper layer.

If the particles contained in the surface adhesive layer are other than spherical, or even if the particles are spherical, if the content is less than 0.2 solid% by mass, the threads are thread-shaped or tape-shaped. When it is wound into a bobbin-shaped roll by slitting it into a roll, it is not possible to obtain sufficient slipperiness between the front and back of the thread, and the bobbin-shaped roll has irregularities and side drops. Cause
Yield and workability are significantly reduced. Further, during slitting, friction with each part guide increases, thread breakage occurs, and yield decreases. Further, strong pressure is applied to a part of the roll, blocking occurs, and it becomes difficult to use. Further, the content of the spherical particles is 20% by mass of solid.
If it exceeds, sufficient adhesive force with the paper layer cannot be obtained, and use becomes difficult.

In the present invention, in order to improve the slippage between the front and back of the thread and between the slitter guide and the adhesive layer, the cumulative mass of spherical particles measured by laser diffraction particle size distribution is 5
The 0% particle size is preferably 0.5 to 3.0 times the surface adhesive layer thickness, and more preferably 0.7 to 2.0.
Double. The adhesive layer thickness is the coating amount of only the adhesive component divided by the density of the adhesive, and indicates the thickness of the adhesive layer in the state where spherical particles are not contained. Cumulative mass 50
If the ratio of the% particle diameter to the thickness of the surface adhesive layer is less than the lower limit, the slippage between the front and back of the thread and between the adhesive layer and the guide portion tends to be poor, and workability tends to be poor. On the other hand, when the amount exceeds the upper limit, the particles tend to jump out of the adhesive layer too much and the adhesive strength with the paper layer tends to be poor.

Further, it is preferable that the spherical particles have a particle size distribution such that the value of cumulative mass 90% particle diameter / cumulative mass 10% particle diameter is 3.0 or less, more preferably 2.5 or less. . The closer this value is to 1, the more preferable. On the other hand, when it exceeds 3.0, the absolute amount of particles contributing to the slip is small, the slipperiness is deteriorated, and the workability tends to be poor.

In the present invention, the spherical particles are preferably at least one selected from silica, light calcium carbonate, magnesium carbonate, plastic particles and starch. The average particle diameter of the spherical particles of the present invention is 2.0.
Those having a thickness of about 50 μm are used.

The coefficient of static friction between the front and back of the thread is 0.1.
1.8 is preferable, and 0.15-0.8 is more preferable. If the coefficient of static friction is less than the lower limit, the front and back of the thread will slip too much, making it difficult to handle and the workability will tend to be poor. On the other hand, if the upper limit is exceeded, slippage between the front and back of the thread and between each guide portion and the adhesive layer becomes poor, which may cause thread breakage, resulting in poor workability.

As the base material of the thread of the present invention, a thread-shaped or tape-shaped material is used. Examples of the thread-shaped thread base material of the present invention include threads made of natural fibers such as cotton, hemp, and silk, and synthetic fibers such as acrylic resin fibers, polyester resin fibers, and nylon resin fibers. Further, the thread-like thread is preferably a dyed thread, a thread having a metal vapor deposition layer, or a thread twisted with a metal foil because of excellent anti-counterfeiting property. The thickness (diameter) of these thread threads is about 10 to 80 μm, particularly 10 to 40 μm.
It is preferably about m.

Examples of the tape-shaped thread base material include those made of a synthetic resin film. Specific examples of the synthetic resin film include, for example, polyethylene terephthalate (PET), polyethylene naphthalate (PEN),
A simple substance or a composite of materials such as synthetic resins such as polyvinyl chloride, polyester, polycarbonate, polyolefin, polystyrene and natural resins can be used. Among them, polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), which have heat resistance and good dimensional stability
Is preferred. The tape-shaped thread of the present invention has a width and a thickness of about 0.2 to 30 mm after slitting, and a thickness of about 7 to 100 μm.

When a metal vapor deposition film in which a metal vapor deposition layer is laminated on a synthetic resin film is used as the thread base material, the metallic luster portion cannot be forged even when copied by a copying machine, and it is difficult to alter it. More excellent anti-counterfeiting,
preferable. As the metal constituting the metal vapor deposition layer, Al,
Zn, Cu, Sn, Ag, Cr, Ni-Cr, ITO,
Pd, Ti, Co, Co-Ni, Co-Cr, etc. are mentioned. Furthermore, for the purpose of preventing forgery and decorative purposes, various thread substrates are subjected to printing of characters and patterns, optical special processing such as holograms and grating images, and a magnetic recording layer is provided to provide information. You can also do it.

The adhesive in the adhesive layer used in the present invention may be an organic solvent type such as polyester type resin, urethane type resin, acrylic type resin, vinyl acetate type resin and / or aqueous type (water soluble type, latex type). ) Based adhesives, but not limited to these. For example, ethylene-vinyl acetate resin, polyester resin, vinyl chloride-vinyl acetate resin, acrylic resin, styrene-isoprene resin, styrene-butadiene resin, vinyl acetate-vinyl alcohol resin, olefin resin, acrylic -A known or officially used resin composition that can be generally used as a heat seal adhesive, such as styrene resin, starch, or PVA, can be used.

These resins may be used alone as an adhesive, or a plurality of resins may be mixed and used. If necessary, various known dyes or pigments, surfactants such as defoaming agents and wetting agents, antiblocking agents, lubricants, thickeners and other auxiliary agents may be added.

Further, in the case of anti-counterfeit paper in which threads are exposed on the surface, that is, in the case of a structure such as an adhesive layer / base material / adhesive layer / paper layer, the adhesive layer on the exposed side is used for printing. In order to prevent adhesion with ink, it is preferable to use an organic solvent-soluble type ethylene-vinyl acetate resin, polyester resin, vinyl chloride-vinyl acetate resin, acrylic resin or the like.

When a metal vapor deposition film is used as the thread base material, an adhesive layer is preferably applied to at least the metal vapor deposition layer side of the tape-shaped thread base material for adhering the paper layer and the metal vapor deposition layer, and the opposite surface. May be applied to. For example, substrate / deposition layer / adhesive layer / paper layer, adhesive layer /
A substrate / deposition layer / adhesive layer / paper layer configuration is possible. When a metal vapor deposition film is used as the thread base material and an adhesive layer is provided on the metal vapor deposition layer, ethylene-vinyl acetate resin, polyester resin, vinyl chloride-vinyl acetate are used in terms of adhesiveness with the metal vapor deposition layer. It is preferable that the main component is at least one kind of adhesive selected from resin, olefin resin, and acrylic resin.

When the thread of the present invention is a tape-shaped thread, an adhesive is applied to at least one side of a plastic film as a base material, dried, and then slit into a predetermined width and wound on a bobbin. You can get it.

The adhesive is applied by various coating devices such as brush coating, spray coating, roll coater, Meyer bar coater, gravure roll coater, blade coater and air knife coater, and drying is combined with the above coating device. Made in the conventional way. In addition,
It is effective for improving the slipperiness that the moisture content of the adhesive layer immediately after drying is 0.8% or less. Furthermore, although preferably about 0.5 to 20 g / m ² in dry weight coating amount of the adhesive, if less than 0.5 g / m ^2, may not sufficient adhesive strength can not be obtained, 20 g / m ^When it exceeds ² , the adhesive function is saturated and excessive drying is required, which is not economically preferable.

The thread thus obtained is subjected to a papermaking process of a known multi-layered paper machine in which various wire parts are combined, at least before the final papermaking, while being unwound, between the paper layers, Alternatively, it is inserted into the surface of the paper layer, various surface sizes and the like are coated with a size press device or the like during paper making, if necessary, and dried with a dryer to obtain a desired anti-counterfeit paper. Further, the obtained anti-counterfeit paper may be subjected to machine calendering or super calendering, or a pigment coating layer, a heat-sensitive recording layer, a thermal transfer image-receiving layer, an inkjet recording layer or the like may be provided on the surface with various coating devices.

The anti-counterfeit paper obtained in the present invention is usually used for bills and gift certificates after further desired printing and cutting. Alternatively, a magnetic recording layer is further provided to be used as a ticket or a prepaid card.

[0033]

The present invention will be described in more detail with reference to the following examples, but of course the present invention is not limited thereto. Further, unless otherwise specified, the parts and% in the examples represent parts by mass and% by mass, respectively.

Example 1 [Preparation of thread] A 12 μm thick aluminum vapor-deposited PET film (trade name: G1302E-12, manufactured by Diamond Foil Hoechst) was used as a substrate, and a glass transition was made on the non-vapor-deposited surface side of the film. Acrylic organic solvent solution type adhesive with a temperature of about 30 ° C (trade name: XC-88, manufactured by Kyowa Chemical Industry Co.,
Solvent: ethyl acetate) was applied and dried with a gravure roll coater so that the dry mass was 1.0 g / m ² .

Next, an ethylene-vinyl acetate-based water-dispersed adhesive (trade name: Sumikaflex 40) was formed on the aluminum vapor deposition surface side.
0, Sumitomo Chemical Co., Ltd., Tg = 0 ° C.) 100 parts of spherical silica having an average particle diameter of 7.0 μm (trade name: Cyrosphere C-1507, manufactured by Fuji Silysia Chemical Ltd., d90 / d10).
= 1.85) 5 parts, fluorescent dye (trade name: Caycor BU
LC, manufactured by Nippon Soda Co., Ltd.), and after thoroughly stirring,
A gravure roll coater was applied and dried so that the dry mass was 6.0 g / m ^2, and threads were obtained. The ratio of spherical particles in the surface adhesive layer was 4.7%. Then, after slitting with a micro slitter to a width of 1 mm, it was wound on a bobbin to obtain a tape-shaped thread.

[Manufacture of anti-counterfeit paper] In a cylinder paper machine equipped with two tank cylinder bats, tapes of 1 cm x 1 cm shape were preliminarily placed on the same circumferential surface of the cylinder cylinder of the first tank at 1 cm intervals. By sticking and closing the mesh, a paper layer having 1 cm × 1 cm holes at 1 cm intervals was formed as a first paper layer. The second cylinder cylinder cylinder was not worked to form a plain second paper layer. Also, a thread unwinding device is installed between the cylinder cylinders of the first tank and the second tank, and the thread is aligned with the hole of the first paper layer, and the second paper layer and the aluminum vapor deposition surface side are in contact with each other. It was inserted. Wet paper made with this paper machine (water content about 50%)
12 cylinder dryers (surface temperature of about 80 ~
After drying at 100 ° C.), machine calendering was performed to obtain a type of anti-counterfeit paper in which threads were repeatedly exposed and buried on one side.

Example 2 An ethylene-vinyl acetate-based water-dispersed adhesive (trade name: SUMIKAFLEX 4) was applied to the vapor-deposited surface side of an aluminum vapor-deposited PET film.
00, manufactured by Sumitomo Chemical Co., Ltd., Tg = 0 ° C.) 100 parts of spherical silica having an average particle diameter of 7.0 μm (trade name: Cyrosphere C-1507, manufactured by Fuji Silysia Chemical Ltd., d90 / d1).
0 = 1.85) 5 parts, fluorescent dye (trade name: K-Call B)
0.6 part (ULC, manufactured by Nippon Soda Co., Ltd.) was added, well stirred, and then coated with a gravure roll coater so as to have a dry mass of 6.8 g / m ² and dried to obtain a thread. Using this thread, a forgery prevention sheet was obtained in exactly the same manner as in Example 1. The ratio of spherical particles in the surface adhesive layer is
It was 4.7%.

Example 3 A vinyl chloride-vinyl acetate organic solvent solution adhesive (trade name: A-201D, Dainippon Ink and Chemicals, Inc.) having a glass transition temperature of about 70 ° C. was formed on the non-evaporated surface side of an aluminum vapor-deposited PET film. (Manufactured by, solvent: ethyl acetate / acetone) was applied and dried to a dry mass of 1.3 g / m ² . next,
Ethylene-vinyl acetate-based water-dispersed adhesive (trade name: Sumikaflex 400, manufactured by Sumitomo Chemical Co., Ltd., Tg = 0 ° C.) on 100 parts of the aluminum vapor-deposited surface, spherical silica having an average particle diameter of 4.0 μm (trade name: Cyrosphere C-1504, manufactured by Fuji Silysia Chemical Ltd., d90 / d10 = 1.90) 0.5
Parts, and 0.6 parts of a fluorescent dye (trade name: K-Call BULC, manufactured by Nippon Soda Co., Ltd.) were added, and after thorough stirring, the dry mass was 5.
A gravure roll coater was applied and dried to obtain a thread of 0 g / m ² . Using this thread, a forgery prevention sheet was obtained in exactly the same manner as in Example 1. The ratio of spherical particles in the surface adhesive layer was 0.5%.

Example 4 A vinyl chloride-vinyl acetate organic solvent solution adhesive (trade name: A-201D, Dainippon Ink and Chemicals, Inc.) having a glass transition temperature of about 70 ° C. was formed on the non-deposited surface side of an aluminum vapor-deposited PET film. (Manufactured by, solvent: ethyl acetate / acetone) was applied and dried to a dry mass of 1.3 g / m ² . next,
Ethylene-vinyl acetate water-dispersed adhesive (trade name: Sumikaflex 400, manufactured by Sumitomo Chemical Co., Ltd., Tg = 0 ° C.) on 100 parts of aluminum vapor-deposited surface, spherical silica having an average particle diameter of 7.0 μm on 100 parts (trade name: Cyrosphere C-1507, manufactured by Fuji Silysia Chemical Ltd., d90 / d10 = 1.85) 15
Parts, and 0.6 parts of fluorescent dye (trade name: K-Call BULC, manufactured by Nippon Soda Co., Ltd.) were added, and after stirring well, the dry mass was 6.
A gravure roll coater was applied and dried to obtain a thread of 0 g / m ² . Using this thread, a forgery prevention sheet was obtained in exactly the same manner as in Example 1. The ratio of spherical particles in the surface adhesive layer was 13.0%.

Example 5 A vinyl chloride-vinyl acetate organic solvent solution type adhesive (trade name: A-201D, Dainippon Ink and Chemicals, Inc.) having a glass transition temperature of about 70 ° C. was formed on the non-deposited surface side of an aluminum vapor-deposited PET film. (Manufactured by, solvent: ethyl acetate / acetone) was applied and dried to a dry mass of 1.3 g / m ² . next,
Ethylene-vinyl acetate-based water-dispersed adhesive (trade name: Sumikaflex 400, manufactured by Sumitomo Chemical Co., Ltd., Tg = 0 ° C.) on 100 parts of aluminum vapor-deposited surface, spherical silica having an average particle diameter of 10.0 μm (trade name: 100 μm). Cyrosphere C-1510, manufactured by Fuji Silysia Chemical Ltd., d90 / d10 = 1.80) 5
Parts, and 0.6 parts of a fluorescent dye (trade name: K-Call BULC, manufactured by Nippon Soda Co., Ltd.) were added, and after thorough stirring, the dry mass was 5.
A gravure roll coater was applied and dried to obtain a thread of 5 g / m ² . Using this thread, a forgery prevention sheet was obtained in exactly the same manner as in Example 1. The ratio of spherical particles in the surface adhesive layer was 4.7%.

Example 6 A vinyl chloride-vinyl acetate organic solvent solution type adhesive (trade name: A-201D, Dainippon Ink and Chemicals, Inc.) having a glass transition temperature of about 70 ° C. was formed on the non-deposited surface side of an aluminum vapor-deposited PET film. (Manufactured by, solvent: ethyl acetate / acetone) was applied and dried to a dry mass of 1.3 g / m ² . next,
Ethylene-vinyl acetate-based water-dispersed adhesive (trade name: Sumikaflex 400, manufactured by Sumitomo Chemical Co., Ltd., Tg = 0 ° C.) on 100 parts of aluminum vapor-deposited surface, spherical silica having an average particle diameter of 4.0 μm (trade name: Cyrosphere C-1504, manufactured by Fuji Silysia Chemical Ltd., d90 / d10 = 1.85) 5 parts,
0.6 part of a fluorescent dye (trade name: K-Call BULC, manufactured by Nippon Soda Co., Ltd.) was added, and after stirring well, the dry mass was 6.7.
A gravure roll coater was applied and dried to obtain g / m ^2, and threads were obtained. Using this thread, a forgery prevention sheet was obtained in exactly the same manner as in Example 1. The ratio of spherical particles in the surface adhesive layer was 4.7%.

Example 7 A vinyl chloride-vinyl acetate organic solvent solution adhesive (trade name: A-201D, Dainippon Ink and Chemicals, Inc.) having a glass transition temperature of about 70 ° C. was formed on the non-deposited surface side of an aluminum vapor-deposited PET film. (Manufactured by, solvent: ethyl acetate / acetone) was applied and dried to a dry mass of 1.3 g / m ² . next,
Ethylene-vinyl acetate water-dispersed adhesive (trade name: Sumikaflex 400, manufactured by Sumitomo Chemical Co., Ltd., Tg = 0 ° C.) on 100 parts of aluminum vapor-deposited surface, spherical calcium carbonate having an average particle diameter of 10.0 μm (trade name) : ED-X, manufactured by Yonejo Lime Industry Co., Ltd., d90 / d10 = 3.50, 5 parts, and fluorescent dye (trade name: Caycor BULC, manufactured by Nippon Soda Co., Ltd.) 0.6 part were added, and the mixture was thoroughly stirred and dried. A thread was obtained by coating with a gravure roll coater and drying so that the mass was 8.0 g / m ² . Using this thread, a forgery prevention sheet was obtained in exactly the same manner as in Example 1. The ratio of spherical particles in the surface adhesive layer was 4.7%.

Example 8 100 parts of an ethylene-vinyl acetate-based water-dispersed adhesive (trade name: Sumikaflex 400, manufactured by Sumitomo Chemical Co., Ltd., Tg = 0 ° C.) on the aluminum-deposited surface of an aluminum-deposited PET film was used as an average particle. Spherical plastic particles with a diameter of 2.5 μm (trade name: Cybinol PG-2, manufactured by Saiden Chemical Co., d9
0 / d10 = 3.90) 5 parts and a fluorescent dye (trade name: K-Call BULC, manufactured by Nippon Soda Co., Ltd.) 0.6 part were added, and after stirring well, the dry mass became 4.5 g / m ^2. A gravure roll coater was applied and dried to obtain a thread. Using this thread, a forgery prevention sheet was obtained in exactly the same manner as in Example 1. The ratio of spherical particles in the surface adhesive layer was 4.7%.

Example 9 Ethylene is deposited on the aluminum vapor-deposited surface of the aluminum vapor-deposited PET film.
-Vinyl acetate water-dispersed adhesive (Product name: Sumika Fret
Kusu 400, Sumitomo Chemical Co., Ltd., Tg = 0 ° C) 100 parts
And starch particles having an average particle size of 15.2 μm (trade name: AS-
225, manufactured by Nagase & Co., d90 / d10 = 2.20) 5
Department, Fluorescent Dye (Product name: K-Call BULC, Nippon Soda)
(Manufactured by the same company) was added, and after stirring well, the dry mass was 9.
5 g / m ² Gravure roll coater
The cloth was dried and threads were obtained. Use this thread
Then, in the same manner as in Example 1, an anti-counterfeit paper was obtained. table
The ratio of the spherical particles in the surface adhesive layer was 4.7%.

Comparative Example 1 An ethylene-vinyl acetate water-dispersed adhesive (trade name: Sumikaflex 400, manufactured by Sumitomo Chemical Co., Ltd., Tg = 0 ° C.) on the aluminum vapor-deposited surface side of an aluminum vapor-deposited PET film has an average particle of 100 parts. Amorphous silica having a diameter of 7.0 μm (trade name: Sylysia 370, manufactured by Fuji Silysia Chemical Ltd., d90 / d10
= 2.30) 5 parts, fluorescent dye (trade name: Caycor BU
LC, manufactured by Nippon Soda Co., Ltd.), and after thoroughly stirring,
A thread was obtained by coating with a gravure coater to a dry mass of 6.0 g / m ² and drying to a water content of 0.6%. Using this thread, a forgery prevention sheet was obtained in exactly the same manner as in Example 1. The proportion of amorphous silica in the surface adhesive layer was 4.7%.

Comparative Example 2 A vinyl chloride-vinyl acetate organic solvent solution type adhesive (trade name: A-201D, Dainippon Ink and Chemicals, Inc.) having a glass transition temperature of about 70 ° C. was formed on the non-deposited surface side of an aluminum vapor-deposited PET film. (Manufactured by, solvent: ethyl acetate / acetone) was applied and dried to a dry mass of 1.3 g / m ² . next,
Ethylene-vinyl acetate water-dispersed adhesive (trade name: Sumikaflex 400, manufactured by Sumitomo Chemical Co., Ltd., Tg = 0 ° C.) on 100 parts of the aluminum vapor-deposited surface, and 100 parts of spherical silica having an average particle diameter of 10.0 μm (trade name: Cylosphere C-1510, manufactured by Fuji Silysia Chemical Ltd., d90 / d10 = 1.80)
1 part and 0.6 part of a fluorescent dye (Brand name: Caycor BULC, manufactured by Nippon Soda Co., Ltd.) were added, well stirred, and then coated with a gravure roll coater so that the dry mass was 8.5 g / m ^2, and dried. And got a thread. Using this thread, a forgery prevention sheet was obtained in exactly the same manner as in Example 1.
The ratio of spherical particles in the surface adhesive layer was 0.1%.

Comparative Example 3 A vinyl chloride-vinyl acetate organic solvent solution type adhesive (trade name: A-201D, Dainippon Ink and Chemicals, Inc.) having a glass transition temperature of about 70 ° C. was formed on the non-deposited surface side of an aluminum vapor-deposited PET film. (Manufactured by, solvent: ethyl acetate / acetone) was applied and dried to a dry mass of 1.3 g / m ² . next,
Ethylene-vinyl acetate-based water-dispersed adhesive (trade name: Sumikaflex 400, manufactured by Sumitomo Chemical Co., Ltd., Tg = 0 ° C.) on 100 parts of aluminum vapor-deposited surface, spherical silica having an average particle diameter of 10.0 μm (trade name: 100 μm). Cyrosphere C-1510, manufactured by Fuji Silysia Chemical Ltd., d90 / d10 = 1.80) 30
Part, fluorescent dye (trade name: K-Call BULC, manufactured by Nippon Soda Co., Ltd.), 0.6 part, and after thorough stirring, dried mass.
A gravure roll coater was applied and dried to obtain 8.5 g / m ² to obtain a thread. Using this thread, a forgery prevention sheet was obtained in exactly the same manner as in Example 1.
The ratio of spherical particles in the surface adhesive layer was 23.0%.

Comparative Example 4 A vinyl chloride-vinyl acetate-based organic solvent solution adhesive (trade name: A-201D, Dainippon Ink and Chemicals, Inc.) having a glass transition temperature of about 70 ° C. was formed on the non-evaporated surface side of an aluminum vapor-deposited PET film. (Manufactured by, solvent: ethyl acetate / acetone) was applied and dried to a dry mass of 1.3 g / m ² . next,
Ethylene-vinyl acetate water-dispersed adhesive (trade name: Sumika Flex 400, Sumitomo Chemical Co., Ltd., Tg = 0 ° C.) on 100 parts of aluminum vapor-deposited surface, plate-like kaolin (trade name: H)
T-Clay, manufactured by Engelhart Co., Ltd., 5.0 parts, fluorescent dye (trade name: Kacol BULC, manufactured by Nippon Soda Co., Ltd.) 0.6
Parts, and after stirring well, dry mass. 8.5 g / m ²
Was coated with a gravure roll coater and dried to obtain a thread. Example 1 using this thread
An anti-counterfeit paper was obtained in exactly the same manner as. The ratio of plate kaolin in the surface adhesive layer was 4.7%.

Comparative Example 5 A vinyl chloride-vinyl acetate organic solvent solution type adhesive (trade name: A-201D, Dainippon Ink and Chemicals, Inc.) having a glass transition temperature of about 70 ° C. was formed on the non-deposited surface side of an aluminum vapor-deposited PET film. (Manufactured by, solvent: ethyl acetate / acetone) was applied and dried to a dry mass of 1.3 g / m ² . next,
Ethylene-vinyl acetate water-dispersed adhesive (trade name: Sumikaflex 400, manufactured by Sumitomo Chemical Co., Ltd., Tg = 0 ° C.) on 100 parts of aluminum vapor-deposited surface, spindle-shaped calcium carbonate (trade name: PP-4, rice) 5.0 parts by Sho-lime Industry Co., Ltd., fluorescent dye (trade name: K-Call BULC, manufactured by Nippon Soda Co., Ltd.)
Add 6 parts, stir well, then dry mass. 8.5 g / m
^A gravure roll coater was applied so as to be ^2, and dried to obtain a thread. Using this thread, a forgery prevention sheet was obtained in exactly the same manner as in Example 1. The ratio of spindle-shaped calcium carbonate in the surface adhesive layer was 4.7%.

The cumulative mass 50% particle diameter (hereinafter referred to as d50) of the spherical particles used for the thread adhesive was measured. Further, the thickness of the surface adhesive layer containing the spherical particles was measured by the following method. From this, the value of (d50 / surface adhesive layer thickness) was calculated. The results are shown in Table 1. Separately, the values of the cumulative mass 90% particle diameter (hereinafter referred to as d90) of the spherical particles and the cumulative mass 10% particle diameter (d10) were measured, and (d90 /
The value of d10) was calculated. The results are shown in Table 1. Also, regarding the obtained thread and anti-counterfeit paper, "friction coefficient between front and back of thread", "workability in paper making process of paper machine", "adhesive strength between thread and paper layer", and "prevention of anti-counterfeit paper""Storability" was evaluated by the following method, and the results are shown in Table 2.

[Measurement of Cumulative Mass Particle Diameter of Spherical Particles] It was measured by a laser diffraction type particle size distribution measuring method.

[Measurement of Surface Adhesive Layer Thickness] It was measured by a cross-sectional photograph taken with an electron microscope. The adhesive layer thickness in this case refers to the thickness of the adhesive layer in the state where spherical particles are not contained.

[Measurement of Static Friction Coefficient] The friction coefficient between the front and back of the thread was measured according to the friction coefficient test method for paper and paper board specified in JIS P8147.

[Workability] The thread was slit to a width of 1 mm, wound on a bobbin for 10,000 m, inserted in the paper layers while being unwound in the paper making process of a paper machine, and the workability was evaluated according to the following criteria. ◎: No thread breakage and good workability ○: Some thread breakage ×: Many thread breakage

[Adhesive Strength] 1 thread of anti-counterfeit paper
It was peeled off at an angle of 80 ° at a speed of 0.3 m / min, and the adhesive strength of the exposed thread portion was measured and evaluated according to the following criteria. ⊚: Adhesive strength is 15 gf / 1 mm or more ◯; Adhesive strength is 10 gf / 1 mm or more to 15 gf / 1 m
Less than m Δ: Adhesive strength is 5 gf / 1 mm or more to 10 gf / 1 mm
Less than x; adhesive strength is less than 5 gf / 1 mm

[Preservation] 10 threads for anti-counterfeit paper
00m papermaking, then part of it at 23 ℃, 50% R
Using a sample stored in H environment for 6 months, JI
The thread was peeled off from the paper layer at an angle of 180 ° C. at a speed of 0.3 m / min by a method according to S Z 0237, and the adhesive strength of the exposed thread portion was measured and evaluated according to the following criteria. ⊚: Adhesive strength is 15 gf / 1 mm or more ◯; Adhesive strength is 10 gf / 1 mm or more to 15 gf / 1 m
Less than m Δ: Adhesive strength is 5 gf / 1 mm or more to 10 gf / 1 mm
Less than x; adhesive strength is less than 5 gf / 1 mm

[0057]

[Table 1]

[0058]

[Table 2]

[0059]

The thread and anti-counterfeit paper of the present invention are
It is an anti-counterfeit paper that does not have thread breakage, yield loss, etc., has excellent workability and adhesion to the paper layer, and does not decrease in adhesion over time, and can be used as securities, banknotes, gift certificates, checks, stock certificates, Excellent for passports, identification cards, cards and various confidential documents.

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2C005 HA02 HA04 HB01 HB02 HB10                       HB20 JA01 JB08 JB28 KA01                       KA09 KA15 KA38 KA40 KA49                       KA57 LA04 LA05                 4L055 AG99 AH50 AJ02 BD03 BD17                       EA16 FA30 GA45

Claims (4)

[Claims] 1. A thread in which one or more adhesive layers are provided on one or both sides of a substrate, wherein at least one surface adhesive layer contains 0.2 to 20 solid mass% of spherical particles. thread. 2. The cumulative mass 50% particle diameter of the spherical particles measured by a laser diffraction type particle size distribution is 0.5 to 3.0 times the surface adhesive layer thickness. Thread listed. 3. The spherical particles according to claim 1, wherein the spherical particles have a particle size distribution such that a value of cumulative mass 90% particle diameter / cumulative mass 10% particle diameter is 3.0 or less. Thread. 4. An anti-counterfeit paper in which the thread according to any one of claims 1 to 3 is incorporated into a paper layer.