JP2016023382A - Information recording paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide information recording paper which has suitability for security systems for prevention of information taking-out from a controlled area.SOLUTION: Information recording paper 1 has a layer 11 containing a ferromagnetic metal and printable layers 12, with the printable layers 12 arranged on both sides of the layer 11 containing a ferromagnetic metal, and the layer 11 containing a ferromagnetic metal has a metal content of 60-150 g/m. Another information recording paper has a layer containing a nonmagnetic metal and printable layers, with the printable layers arranged on both sides of the layer containing a nonmagnetic metal, and the layer containing a nonmagnetic metal has a metal content of 80-180 g/m.SELECTED DRAWING: Figure 1

Description

The present invention relates to an information recording sheet applicable to a security system for preventing information from being taken out from a management area, and more particularly to an information recording sheet applicable to a metal detection system.

In recent years, prevention of information leakage has become increasingly important for corporate activities, and an increasing number of companies are taking measures against taking out confidential documents in the company. For example, there are cases where countermeasures against taking out confidential documents in a company are taken by limiting the printing of confidential documents or providing a check function. However, there are many cases where strict measures are not taken for taking out printed confidential documents outside the company, and there are cases where the printed confidential documents can be easily taken out outside the company.

Based on this situation, security measures using the Barkhausen effect have been proposed. This system is a method for detecting a magnetic field distortion of a pulse generated by continuously reversing the magnetization polarity, which is generated by applying an alternating magnetic field to a magnetic material having a very small coercive force. If the paper for printing important confidential documents is loaded with a magnetic material applicable to the system, when the confidential document is to be taken out of the office, the system will sound an alarm and send the information to the outside. It is possible to prevent taking out. As a magnetic material suitable for this system, a ribbon having a large aspect ratio or a fibrous special amorphous magnetic material is used, and the material is attached to paper or is made into paper. (For example, Patent Document 1)

Furthermore, it has also been proposed to provide a conductive layer inside the paper surface for the purpose of preventing the electrical resistivity of the paper from partially lowering and degrading the image quality by adding a special amorphous magnetic material. Yes. (For example, Patent Document 2)

JP2007-177361 JP2013-119694A

Security measures using the Barkhausen effect require that the information recording sheet has a ribbon or fibrous amorphous metal that has a low holding power and is easy to reverse the magnetization because of its detection principle. However, such a material is very expensive, and it is necessary to put a ribbon or a fibrous material into each information recording sheet, which has a high technical hurdle. In addition, the ratio of the material ribbons and fibers contained in one sheet of information recording paper is low, the amorphous metal used in such a system has a high aspect ratio, and the material is paper. Since it is visible when viewed through, for example, if the part where the material is present is intentionally and carefully cut out, it is possible to take out most of the information recording paper on which confidential information is recorded out of the information management area Met.

Further, most of the metal materials contained in the information recording paper are dark colors, and when such materials are contained in the information recording paper, the lightness of the paper surface may be lowered. In such a case, the contrast between the paper surface and the print portion may be lowered, and the visibility of the print information may be lowered.

In addition, it is known that electrophotographic copiers and printers with a heat roll fixing method, in particular, will have a significant impact on their sales if they do not comply with the European Eco Mark standard represented by Blue Angel. Yes. For example, if the information recording paper contains a certain amount or more of components that volatilize by heating, the total volatile organic compounds amount (hereinafter also referred to as the TVOC amount) emitted from a copying machine or printer exceeds the Eco Mark standard. There was a case.

The present invention has been made in view of the above problems, and a first object thereof is an information recording sheet that can be detected by a metal detection system and can prevent information leakage due to partial cutting of the information recording sheet. It is to provide. A second object is to provide an information recording sheet that can be detected by a metal detection system and has excellent recorded information visibility.

The present invention (1) is an information recording sheet having adaptability to a security system for preventing information from being taken out from a management area,
The information recording paper is
Having at least a ferromagnetic metal-containing layer and a printable layer;
Having the printable layer on both sides of the ferromagnetic metal-containing layer;
It said ferromagnetic metal-containing layer ^is an information recording sheet, characterized by having a metal content of ^{60g / m 2 ~150g / m 2} .

The present invention (2) is an information recording sheet having adaptability to a security system for preventing information from being taken out from a management area,
The information recording paper is
Having at least a non-magnetic metal-containing layer and a printable layer,
Having the printable layer on both sides of the non-magnetic metal-containing layer;
Non-magnetic metal-containing layer is a recording sheet characterized by having a non-magnetic metal of ^{80g / m 2 ~180g / m 2} .

The present invention (3) is the information recording sheet according to the invention (1) or (2), wherein the difference in brightness between the information recording sheet and the information printing unit is 50 or more.

The present invention (4), the invention (1), wherein the printable layer is paper having a basis weight of ^25g / ^{m 2 ~65g} / m 2 for the pulp as the main raw material, (2) or (3 ).

The present invention (5) is the information recording sheet according to the invention (1), (2), (3) or (4), wherein the TVOC amount when heated at 200 ° C. is 400 ppm or less.

In the present invention (6), the total thickness of the information recording paper is 70 μm to 250 μm,
The information recording paper according to the invention (1), (2), (3), (4) or (5), wherein the taper stiffness is 0.5 mN · m to 4.0 mN · m. is there.

According to the present invention, at least a ferromagnetic metal-containing layer and a printable layer are provided, the printable layers are provided on both sides of the ferromagnetic metal-containing layer, and the ferromagnetic metal-containing layer has a thickness of 60 g / m ² to Having a metal amount of 150 g / m ² , or having at least a non-magnetic metal-containing layer and a printable layer, and having the printable layer on both sides of the non-magnetic metal-containing layer, the non-magnetic metal-containing layer being 80 g / m ^By using an information recording paper having a nonmagnetic metal amount of ^{2 to} 180 g / m ² as an information printing medium, detection by a metal detection system is possible, and only a portion where a material to be detected such as a special amorphous magnetic material exists. It is possible to provide an information recording sheet that can prevent the act of taking out most of the information recording sheet from the information management area.

Furthermore, by making the lightness difference between the information recording paper and the information printing section 50 or more, the recorded information is highly visible and used as an information recording medium in an electrophotographic copying machine or printer having a toner fixing system by heating. Even in such a case, it is possible to provide an information recording sheet in which the amount of TVOC that volatilizes is suppressed.

It is a layer structural example of the information recording paper which has a powder ferromagnetic metal content layer concerning the present invention. It is a layer structural example of the information recording paper which has a foil-like ferromagnetic metal content layer concerning the present invention. It is a layer structural example of the information recording paper which has a powder nonmagnetic metal content layer concerning the present invention. It is a layer structural example of the information recording paper which has a foil-like nonmagnetic metal content layer concerning the present invention.

  The security system according to the present invention may be any system (apparatus) as long as it is a metal detection system that detects a magnetic field disturbance that occurs when a metal enters a magnetic field formed by a transmission coil, a permanent magnet, or the like. Can also be used.

  In order to prevent most or part of the information printed on the information recording paper from being taken out, a ferromagnetic metal-containing layer or a non-magnetic metal-containing layer should exist over the entire printable layer. Is required. The entire surface in this case refers to 80% or more of the printable surface of the information recording sheet. If more than 80% of the printable surface contains a metal that reacts to the metal detection system, it is virtually impossible to bring out most of the information.

  In addition, if metal is present on 80% or more of the printable surface of the information recording paper, even when information is printed on the information recording paper by the electrophotographic method, the portion of the information recording paper where the metal exists and other portions There is also an advantage that toner transfer unevenness caused by the difference in the electrical resistivity of the toner hardly occurs.

  Hereinafter, an example of the information recording sheet of the present invention will be described with reference to the embodiments shown in the drawings.

The information recording sheet 1 of the present invention shown in FIG. 1 has a powdered ferromagnetic metal-containing layer 11 as a ferromagnetic metal-containing layer, and has a printable layer 12 on both sides thereof.

The powdered ferromagnetic metal-containing layer 11 is mainly composed of a powdered ferromagnetic metal such as iron, cobalt, or nickel, and an adhesive having a function of adhering to the printable layer 12 while dispersing and fixing the powdered ferromagnetic metal. It is configured.

Also, the powder ferromagnetic metal content in the powder ferromagnetic metal-containing layer ^{11, 60g / m 2 ~150g / m} 2, more ^preferably from ^{90g / m 2 ~140g / m 2} . By setting the weight of the ferromagnetic metal powder to 60 g / m ² or more and existing on the entire inner surface of the information recording paper, a practical detection operation is possible with the metal detection system. Can be intentionally cut out from the information recording sheet, and the act of taking most of the information out of the information management area can be prevented. Also, by setting the amount of powdered ferromagnetic metal to 150 g / m ² or less, the thickness and stiffness of the information recording paper can be suppressed to a level that can be fed from a paper feed tray such as a printer, and the information recording paper is different from normal information recording paper. It is possible to realize no handling.

The weight average particle size of the powdered ferromagnetic metal is preferably 30 to 150 μm, more preferably 40 to 100 μm, and still more preferably 50 to 90 μm. When the average particle diameter is 150 μm or more, the layer thickness of the powdered ferromagnetic metal and the adhesive is increased, so that the total thickness of the information recording sheet is finally increased. Handling becomes difficult. Further, when the thickness is 30 μm or less, not only the cost of the powdered ferromagnetic metal is increased, but also the ferromagnetic metal-containing layer is finely filled with the powdered ferromagnetic metal and adhered to the printable layer 12. There is a risk that it may be difficult to secure sex. The particle size distribution of the ferromagnetic powder metal is not necessarily uniform.

  Furthermore, the shape of the powdered ferromagnetic metal used in the present invention may be any shape. It may have a flat shape or a needle shape.

Any adhesive can be used as long as it does not peel off from the printable layer 12 when subjected to bending stress. For example, epoxy resins, copolymers of ethylene and (meth) acrylates, polyester resins, polyester polyurethane resins, thermoplastic resins such as vinyl acetate resins, emulsion pastes such as acrylic resins, and reactive curing urethane adhesives Further, hot-melt thermoplastic resins, starch paste, polyolefin (co) polymers such as ethylene vinyl alcohol, polypropylene, and polyethylene can be used. Among them, information recording means, particularly those that do not easily volatilize and are not sticky at a set temperature range of 150 to 200 ° C., which is a set temperature range of an electrophotographic contact toner fixing device, are preferable. This is because when the adhesive contaminates the fixing member, it may cause a paper jam. Also, if a solvent that volatilizes in such a temperature range remains in the adhesive, odor problems may occur during fixing, so the residual amount of solvent used during production is small, such as monomer and oligomer components. It is preferable to select an adhesive having a low content of and having a high resistance to decomposition by heat. In the case where an aqueous solvent adhesive can be used, starch paste, latex, and polyvinyl alcohol (PVA) can be suitably used because they are less likely to cause odor problems during heating.

The printable layer 12 is made of paper mainly composed of pulp, polyethylene terephthalate (PET), polyethylene, polymethylpentene, polystyrene, polybutylene terephthalate, polyethylene naphthalate, polyamide, polyimide, polyvinyl chloride, polyvinylidene chloride, Use a resin film made of resins such as polyvinyl alcohol, ethylene / vinyl alcohol copolymer, polycarbonate, polymethyl methacrylate, polybutene-1, polyether ether ketone, polysulfone, polyether sulfone, polyether imide, polyphenylene sulfide, etc. be able to. In addition, any printing medium that can display information using toner, ink-jet ink, and printing ink can be used. However, in the assumed use environment of the information recording paper of the present invention, paper consumption Since paper is expected to be intense, paper made mainly of pulp can be suitably used in terms of economy. Moreover, since the printable layer 12 exists on both surfaces of the powdered ferromagnetic metal-containing layer 11, printing on both surfaces is possible.

Further, the surface of the printable layer 12 may be provided with a heat-sensitive layer or other coating layer. The coating layer includes pigments and / or fillers such as heavy calcium carbonate, light calcium carbonate, titanium dioxide, aluminum hydroxide, satin white, talc, calcium sulfate, barium sulfate, zinc oxide, magnesium oxide, magnesium carbonate, non- Mineral pigments such as crystalline silica, colloidal silica, white carbon, kaolin, calcined kaolin, delaminated clay, aluminosilicate, sericite, bentonite, smectite, polystyrene resin fine particles, urea formaldehyde resin fine particles, fine hollow particles and Other organic pigments can be used alone or in combination.

As an adhesive for fixing the pigment and / or filler used in the coating layer to the printable layer 12, a synthetic adhesive or a natural adhesive can be used. Synthetic adhesives include styrene / butadiene, styrene / acrylic, ethylene / vinyl acetate, butadiene / methyl methacrylate, vinyl acetate / butyl acrylate, and other copolymers, polyvinyl alcohol, maleic anhydride copolymer, Examples thereof include acrylic acid / methyl methacrylate copolymers, and one or more of these synthetic adhesives can be used depending on the purpose. These adhesives are preferably used in the range of 5 to 50% by mass, more preferably about 10 to 30% by mass per 100% by mass of the pigment. Examples of natural adhesives include generally known adhesives such as oxidized starch, esterified starch, enzyme-modified starch, cold water soluble starch obtained by flash drying them, casein, and soy protein. These adhesives are used in the range of about 0.1 to 50% by mass, more preferably about 2 to 30% by mass per 100% by mass of the pigment. Moreover, you may use suitably various adjuvants, such as a dispersing agent, a thickener, a water retention agent, an antifoamer, and a water resistance agent, as needed. These adhesives are preferably selected in consideration of the odor problem as in the case of the adhesive for dispersing and fixing the powdered ferromagnetic metal.

In order to improve the whiteness of the printable layer 12 and to provide contrast with the information printing portion, it is effective to apply a paint containing a fluorescent brightener or a white pigment. As the fluorescent brightening agent, aminostilbene sulfonic acid derivative series, imidazole series, oxazole series, benzoxazole series, triazole series, coumarin series, naphthalimide series, pyrazoline series and the like can be used. Moreover, it is preferable to contain 0.1-10 mass parts of fluorescent whitening agents with respect to 100 mass parts of binder resins. If it is less than 0.1 parts by mass, the effect of improving whiteness may be insufficient. Moreover, although it is possible to add exceeding 10 mass parts, the effect of the whiteness improvement beyond it cannot be expected so much.

The coating layer composition containing the components as described above is an on-machine using a known coating apparatus such as a blade coater, an air knife coater, a roll coater, a reverse roll coater, a bar coater, a curtain coater, a die slot coater, and a gravure coater. Alternatively, it can be coated on the substrate in one layer or multiple layers by off-machine. In general, the coating layer is preferably applied so as to have a dry weight of about 5 to 15 g / m ^{2 on} one side.

When paper is used for the pulp to printable layer 12 and the main raw material is preferably a basis weight of ^{25g / m 2 ~65g / m 2} . If it is 25 g / m ² or less, the color of the powdered ferromagnetic metal contained in the powdered ferromagnetic metal-containing layer 11 can be easily recognized through the printable layer 12, and there is a difference in brightness from the information printing part. The information visibility tends to be lowered. In the case of 65 g / m ² or more, the stiffness of the information recording paper 1 becomes too high, and there may be a problem in paper feeding from the paper feeding cassette when printing with a printer or the like.

Moreover, you may add fillers, such as a kaolin, a talc, a calcium carbonate, titanium dioxide, a silica, to the said paper as needed.

Papers made mainly from pulp include hardwood bleached kraft pulp (LBKP), softwood bleached kraft pulp (NBKP), hardwood unbleached kraft pulp (LUKP), softwood unbleached kraft pulp (NUKP), hardwood semi-bleached kraft pulp ( LSBKP), softwood semi-bleached kraft pulp (NSBKP), hardwood sulfite pulp, softwood sulfite pulp and other chemical pulp, stone grand pulp (SGP), pressurized stone grand pulp (PGW), refiner grand pulp (RGP), thermo grand pulp (TGP), Chemi-Grand Pulp (CGP), Crushed Wood Pulp (GP), Thermomechanical Pulp (TMP) and other mechanical pulp, and pulp produced chemically or mechanically from non-wood fibers such as kenaf, hemp, and straw And at least 5% of the total paper In addition to meaning 0% by weight or more of paper, recycled paper made from these main raw materials is also included.

In addition, a known sizing liquid can be surface-treated as necessary. The surface treatment can be performed on the sizing liquid by a commonly used coating means such as a size press, shim size, gate roll, roll coater, bar coater, air knife coater, rod blade coater, blade coater or the like.

The smoothing treatment of the paper subjected to such coating can be carried out by a commonly used smoothing device such as a super calender, a machine calender, a soft nip calender, or the like. It is preferable that the white paper gloss after the smoothing treatment is finished to be 30% or more.

By carrying out such a treatment, it becomes possible to improve the opacity of the paper and to reduce the visibility of the powdered ferromagnetic metal-containing layer 11 which is the inner surface layer. Effects such as improving smoothness and imparting flexibility can also be expected.

On the other hand, when a resin film is used for the printable layer 12, in addition to providing the coating layer, an antistatic layer can be formed or an antistatic agent can be added to prevent charging. . Commonly used antistatic agents include, for example, “anionic low molecular weight antistatic agents such as carboxylic acids, sulfonates, and sulfates” and “cationic low molecular weight types such as quaternary ammonium salts, phosphonium salts, and sulfonium salts. "Antistatic agents", "nonionic low molecular weight antistatic agents" such as polyhydric alcohol derivatives and polyalkylene oxide derivatives, "amphoteric antistatic agents", boron compounds, nitrogen-containing compounds, sulfur-containing compounds, guanidine salts, etc. "Antistatic agents", "complex antistatic agents", "antistatic plasticizers" such as aliphatic compounds and aromatic compounds, polyethylene oxide, quaternary ammonium base-containing (meth) acrylate copolymers, polystyrene Sodium sulfonate, carbobetaine graft copolymer, glycerin fatty acid ester, polyoxyethylene alkyl ether Such as "nonionic surfactant type antistatic agent", alkyl sulfonate, alkylbenzene sulfonate, etc. "anionic surfactant type antistatic agent", tetraalkylammonium salt, trialkylbenzylammonium salt, etc. "Cationic surfactant type antistatic agent", "Amphoteric surfactant type antistatic agent" such as alkylbetaine, alkylimidazolium betaine, "Conductivity" such as polyacetylene, polyparaphenylene, polypyrrole, polythiophene, polyaniline, polyphenylene vinylene, etc. Various antistatic agents such as “adhesive polymer” can be used.

The brightness difference when white or light color material is used for the printable layer 12 is preferably 50 or more, and more preferably 65 or more. As another configuration, a material with low brightness such as black or dark color may be disposed on the printable layer 12 to form an information recording portion with high brightness using white toner, yellow toner, or the like. In order to improve the visibility of information formed on the information recording paper, it is necessary to maintain a high contrast between the printable layer and the information recording portion (toner, inkjet ink, printing ink, etc.). Brightness difference greatly affects this contrast. That is, when the brightness difference between the printable layer and the information recording portion is large, the contrast becomes high, and the visibility of information formed in the information recording portion is conspicuous.

The brightness mentioned here refers to the L value measured by the color difference display method (JIS Z 8730), and indicates the degree of black and white. When a white or light color material is used for the printable layer, the value (L value) obtained by measuring the black solid portion estimated on the information recording portion by a color difference meter is used as a reference to the L value of the unprinted portion of the information recording sheet. The difference was taken as the brightness difference.

Next, the present invention may have a layer structure as shown in FIG. 2, the adhesive layer 22 is provided on both surfaces of the foil-like ferromagnetic metal-containing layer 21, and the printable layer 23 is provided on both outer surfaces thereof.

Metal amount in this ^case, 60 g / m 2 to 150 g / ^{m 2,} more ^preferably, a ^{90g / m 2 ~140g / m 2} , a foil-like ferromagnetic metal containing over the inner layer over the entire surface of the information recording paper 2 It is necessary that the layer 21 is present. In the case of a foil-like ferromagnetic metal, it may be possible to make the metal amount 150 g / m ² or more because it is easy to ensure the flexibility of the information recording paper as compared with the powdered ferromagnetic metal. The adhesive layer 22 exists for the purpose of bonding the printable layer 23 and the foil-like ferromagnetic metal-containing layer 21. The adhesive that can be used for the adhesive layer 22 can be the same as the adhesive example described in the embodiment of FIG. 1 in which the powdered ferromagnetic metal is dispersed and fixed and has an adhesive function with the printable layer 12. In the printable layer 23, a material that can be used for the printable layer 12 of FIG. 1 or a surface treatment (such as a coat) that can be applied adaptively can be used.

The embodiment of FIG. 3 shows a form in which a powder nonmagnetic metal-containing layer 31 is disposed as a nonmagnetic metal-containing layer. The layer configuration is the same as that of the embodiment of FIG. 1, in which the powder ferromagnetic metal-containing layer 11 is changed to the powder nonmagnetic metal-containing layer 31. As the powdered nonmagnetic metal, mainly silver, copper, gold, aluminum, brass, zinc, tin, lead, stainless steel and the like can be used, but aluminum can be preferably used from the balance of economy and detection sensitivity.

The shape of the powder nonmagnetic metal may be any shape. It may have a flat shape or a needle shape. In the case of a flat shape, when the printable layer is bonded using an adhesive paint mixed with an adhesive, the flat particles are arranged in parallel with the printable layer surface, and there is no gap. Therefore, there is an advantage that the reaction to the metal detection system is improved.

The same adhesive as in the embodiment of FIG. 1 can be used as the adhesive that disperses and fixes the powder nonmagnetic metal and has an adhesive function with the printable layer 32. Also in the material that can be used for the printable layer 32, a material that can be used for the printable layer 12 in FIG. 1 or a surface treatment (such as a coat) that can be applied adaptively can be used / implemented.

Non-magnetic metal, since the detection sensitivity by the metal detection system as compared to the ferromagnetic metal is in a slightly lower tendency, as amount of ^metal, the weight of 80g / ^{m 2} ~180g / m 2 are preferred, more preferably, 100g / M ^{2 to} 170 g / m ² . Moreover, it is preferable that the particle diameter of a powder nonmagnetic metal is 30-150 micrometers.

The embodiment of FIG. 4 shows a form in which a foil-like nonmagnetic metal-containing layer 41 is disposed as the nonmagnetic metal-containing layer. The layer configuration is the same as that of the embodiment of FIG. 2, in which the foil-like ferromagnetic metal-containing layer 21 is changed to the foil-like nonmagnetic metal-containing layer 41.

Metal amount in this ^{case, 80g / m 2 ~180g / m} 2, more ^preferably at ^{100g / m 2 ~170g / m 2} , a foil-like non-magnetic metal-containing layer over the inner layer over the entire surface of the information recording paper 4 41 must be present. The adhesive layer 42 is present for the purpose of bonding the printable layer 43 and the foil-like nonmagnetic metal-containing layer 41. The adhesive that can be used for the adhesive layer 42 can be the same as the example of the adhesive having the function of adhering to the printable layer 12 by dispersing and fixing the powdered ferromagnetic metal described in the embodiment of FIG. In addition, the printable layer 43 may be made of a material that can be used for the printable layer 12 in FIG.

Thus, as long as the metal contained in the metal-containing layer according to the present invention can be detected by the metal detection system, it does not matter whether it is powder or foil. Further, it may be a ferromagnetic metal or a non-magnetic metal.

This is because the metal detection system can detect whether the metal is a ferromagnetic metal or a non-magnetic metal. When the ferromagnetic metal enters the magnetic field generated by the transmission coil or permanent magnet of the metal detection system, the ferromagnetic metal itself is magnetized and attracts a part of the magnetic field, thereby disturbing the magnetic field received by the receiver. By detecting the presence of ferromagnetic metal. On the other hand, when the non-magnetic metal enters the magnetic field generated by the transmission coil or permanent magnet of the metal detection system, the non-magnetic metal blocks a part of the magnetic field, and the magnetic field received by the receiving coil is disturbed. This is because it is possible to detect the presence of.

Therefore, the apparatus used in the metal detection system for detecting the information recording paper of the present invention can detect ferromagnetic metals and non-magnetic metals, and has a detection capability sufficient to detect the fastener of clothes in the sensitivity adjustment. Any device can be applied.

Example of method for producing information recording paper having powder metal-containing layer As a method for producing information recording papers 1 and 3 of the present invention, an adhesive containing powdered ferromagnetic metal or powdered non-magnetic metal is prepared, For example, it can be produced by coating and drying one printable layer and then laminating the other printable layer on the adhesive coated surface and dry laminating. Any method other than this method may be used as long as it can reliably perform the adhesion between the printable layer and the powdered ferromagnetic metal-containing layer or the powdered nonmagnetic metal-containing layer. it can.

Example of method for producing information recording paper having foil-like metal-containing layer As a method for producing information recording paper 2 and 4 of the present invention, for example, an adhesive serving as an adhesive layer is applied to one printable layer. At the same time, a laminate a in which a foil-like ferromagnetic metal or a foil-like nonmagnetic metal is laminated is prepared, and an adhesive serving as an adhesive layer is applied to the other printable layer and the foil-like metal of the laminate a is applied. It can be produced by laminating the surface and the adhesive surface. Even if it is a method other than this method, any method can be adopted as long as it can reliably carry out adhesion between the printable layer and the foil-like ferromagnetic metal or foil-like nonmagnetic metal-containing layer.

The TVOC amount according to the present invention is an abbreviation for Total Volatile Organic Compounds and means the total amount of organic volatile compounds. The TVOC amount is stipulated as a condition to be cleared for the Eco Mark certification such as Blue Angel. Particularly in Europe, the sales performance of copiers and printers may be affected by the acquisition of the Eco Mark, and the acquisition of the Eco Mark certification is an important position in the office equipment industry.

The amount of TVOC generated from the information recording paper of the present invention can be measured by the purge and trap GC / MS method. First, outgas is extracted from a test piece 25 mm × 25 mm under conditions of an extraction temperature of 200 ° C. for 5 minutes, and then the outgas is quantified by GC / MS, and the TVOC amount is calculated from the value in terms of styrene. When the TVOC content of the information recording paper of the present invention is measured under the measurement conditions, it is preferably 400 ppm or less. The measurement of the TVOC amount to comply with the Eco Mark standard such as Blue Angel is carried out on the amount of TVOC emitted from the copying machine or the printer as a whole, but the TVOC generated from the information recording paper implemented under the above conditions If the amount is 400 ppm or less, the TVOC amount will not exceed the Eco Mark standard empirically due to the information recording paper.

  The total thickness of the information recording paper of the present invention is preferably 70 μm to 250 μm. If the total thickness is 70 μm or less, the information recording paper becomes too flexible and paper jam tends to occur inside the printing device. On the other hand, when the total thickness is 250 μm or more, the flexibility of the information recording sheet becomes too low, which may hinder paper feeding from the paper feeding cassette.

  Furthermore, the taper stiffness of the information recording paper of the present invention is preferably 0.5 mN · m to 4.0 mN · m. When the taper stiffness is 0.5 mN · m, the flexibility of the information recording paper becomes too high, and there is a tendency for paper jam to occur inside the printing apparatus. On the other hand, when the taper stiffness is 4.0 mN · m or more, the flexibility of the information recording paper becomes too low, which may hinder paper feeding from the paper feeding cassette.

Hereinafter, the information recording paper of the present invention will be described more specifically with reference to examples and comparative examples. However, the present invention is not limited only to these examples.

Example 1
As a ferromagnetic powder according to the present invention, iron powder (particle diameter 80 μm) and polyester urethane adhesive (Takelac A-525 manufactured by Mitsui Chemicals / Takenate A-52 manufactured by Mitsui Chemicals) at a ratio of 60:40 wt% acetic acid. Adhesive paint is prepared by mixing ethyl as a solvent, and is applied onto a paper whose main raw material is 50 μm thick (basis weight: about 35 g / m ² ) using an applicator, then dried and the same as described above. Paper with pulp as the main raw material was laminated by dry lamination to obtain an information recording paper of Example 1 having a three-layer structure and a thickness of 212 μm.

Examples 2-4
Information recording sheets of Examples 2 to 4 were obtained in the same manner as in Example 1 except that the content of iron powder added to the powdered ferromagnetic metal-containing layer was adjusted to the addition amount shown in Table 1, respectively. It was.

Example 5
An information recording paper of Example 5 was obtained in the same manner as in Example 1 except that the thickness of the paper mainly composed of pulp was 65 μm (basis weight was about 49 g / m ² ).

Example 6
The information recording paper of Example 6 was obtained in the same manner as in Example 1 except that the printable layers on both sides were white polyethylene terephthalate films (thickness: 50 μm).

Example 7
On one side, a paper made mainly from pulp with a thickness of 50 μm and a basis weight of about 35 g / m ² prepared as a printable layer, a polyester urethane adhesive with ethyl acetate as a solvent (Takelac A-525 / Mitsui, Mitsui Chemicals) After applying and drying an adhesive paint in which Takenate A-52) manufactured by Kagaku Co., Ltd. is dispersed, a laminate a in which an iron foil having a thickness of 18 μm is dry-laminated is produced, and the same adhesive paint as above is applied to the same paper as above. After the coating and drying, the information recording paper of Example 7 was obtained by dry laminating the iron foil surface and the adhesive surface of the laminate a.

Examples 8 and 9
Examples 8 and 9 were carried out in the same manner as in Example 1 except that the content (average particle diameter: 100 μm) of the aluminum powder added to the powder nonmagnetic metal-containing layer was adjusted to the addition amount shown in Table 1, respectively. No information recording paper was obtained.

Example 10
As a nonmagnetic metal-containing layer according to the present invention, an information recording sheet of Example 10 was obtained in the same manner as in Example 7 except that the iron foil of Example 7 was changed to an aluminum foil having a thickness of 60 μm.

Comparative Example 1
Iron powder (particle size 80 μm) and polyester urethane adhesive (Mitsui Chemicals Takelac A-525 / Mitsui Chemicals Takenate A-52) are mixed at a ratio of 60:40 wt% ethyl acetate as a solvent to form an adhesive paint. Was applied onto only one side of the paper using an applicator on a paper whose main raw material was 50 μm thick pulp (basis weight about 35 g / m ² ), and then dried. Further, a polyester urethane adhesive (Takelac A-525 / Mitsui Chemicals Takenate A-52) made of ethyl acetate as a solvent is applied to the other side not coated with the iron powder-containing adhesive paint, and then dried. Then, a paper having the same pulp as the above as a main raw material was bonded by dry lamination to obtain an information recording paper of Comparative Example 1 in which iron powder having a total thickness of 212 μm was partially (on one side).

Comparative Example 2
An information recording sheet of Comparative Example 2 was obtained in the same manner as in Example 1 except that the content of iron powder added to the powdered ferromagnetic metal-containing layer was adjusted to the addition amount shown in Table 1.

Comparative Example 3
Information of Comparative Example 3 in the same manner as in Example 1 except that the content of aluminum powder (average particle size: 100 μm) added to the powder nonmagnetic metal-containing layer was adjusted to the addition amount shown in Table 1. A record sheet was obtained.

Measurement of lightness difference The information recording paper prepared in Examples and Comparative Examples was cut into A4 size, and a black solid image of 5 cm × 5 cm was printed using Canon IR-ADVC2220F. Using the printed information recording paper, the L value of the black solid portion and the unprinted portion was measured with a color difference meter (Spectral Color Whiteness Meter PF-10 manufactured by Nippon Denshoku Industries Co., Ltd.), and the difference was defined as the lightness difference. .

Stiffness measurement Using a taper stiffness meter (digital taper stiffness tester manufactured by Toyo Seiki Seisakusho Co., Ltd.), paper and paperboard stiffness test method Example and comparison according to Taber stiffness tester method (JIS P 8125: 2000) The stiffness of the information recording paper prepared in the example was measured.

Measurement of TVOC amount Information recording paper prepared in Examples and Comparative Examples was cut into 25 mm × 25 mm, and the gas generated by heating at 200 ° C. for 5 minutes was introduced into the gas chromatography (purge and trap method). The amount of TVOC was measured in terms of toluene.

Paper-passing test The information recording paper prepared in the examples and comparative examples was cut into A4 size and set in a paper feed tray of IR-ADVC2220F manufactured by Canon, and a chart with a printing rate of 5% was printed. At this time, the evaluation was carried out with ◯ when the information recording paper was discharged without any problem and x when the paper jam occurred in the apparatus.

Metal detection test When the information recording paper prepared in Examples and Comparative Examples is cut into A4 size and put in a document bag, when passing through the gate of SMD601 (CEIA metal detector). A test for confirming whether or not metal detection was possible was performed 3 times per sample. The sensitivity set at this time was set to a sensitivity level 75. In the case where the evaluation could be detected three times, it was evaluated as “◯”, when it was detected once or twice, and “△” when it could not be detected once.

The measurement results and test results are shown in Table 1.

更に、比較例１の情報記録用紙に関しては、鉄粉を含まない半面を切り取り、金属検出機での検知を試みたが、検知は出来なかった。

Furthermore, with respect to the information recording paper of Comparative Example 1, half of the sheet containing no iron powder was cut out and detected with a metal detector, but detection was not possible.

As described in Table 1, the information recording sheets of Examples 1 to 10 can be detected by a metal detector three times, and there is a lightness difference of 50 or more between the printed part and the non-printed part. Excellent results. In addition, since the ferromagnetic metal-containing layer or the non-magnetic metal-containing layer is arranged over the entire surface of the information recording paper, only the metal portion that reacts to the security system is cut out, and most of the recorded information is out of the information management area. It was possible to prevent the act of taking it out. On the other hand, the information recording paper having a ferromagnetic metal-containing layer on the half surface of Comparative Example 1 could be detected by a metal detector on the entire A4 size surface, but when the half surface not containing iron powder was cut off, As a result, it was not possible to detect the information recording paper and half of the information recording paper was allowed to leak. The information recording paper of Comparative Example 2 has a low ferromagnetic metal content of 36 g / m ² , so that it cannot be detected once by a metal detector, and the paper jam does not occur in the paper passing test. There has occurred. Since the information recording paper of Comparative Example 3 also has a nonmagnetic metal content as low as 55 g / m ² , detection with a metal detector could only be performed once out of three times.

1, 2, 3, 4... Information recording paper 11... Powdered ferromagnetic metal-containing layers 12, 23, 32 and 43. Printable layer 21.・ ・ ・ ・ ・ Foil-like ferromagnetic metal-containing layers 22, 42... Adhesive layer 31 ....... Powder non-magnetic metal-containing layer 41. .... Foil-like nonmagnetic metal-containing layer

Claims (6)

An information recording sheet having adaptability to a security system for preventing information from being taken out from a management area,
The information recording paper is
Having at least a ferromagnetic metal-containing layer and a printable layer;
Having the printable layer on both sides of the ferromagnetic metal-containing layer;
It said ferromagnetic metal-containing ^layer, information recording paper and having a metal content of ^{60g / m 2 ~150g / m 2} . An information recording sheet having adaptability to a security system for preventing information from being taken out from a management area,
The information recording paper is
Having at least a non-magnetic metal-containing layer and a printable layer,
Having the printable layer on both sides of the non-magnetic metal-containing layer;
Information recording paper non-magnetic metal-containing layer is characterized by having a non-magnetic metal of ^{80g / m 2 ~180g / m 2} .   The information recording sheet according to claim 1 or 2, wherein a difference in brightness between the information recording sheet and the information printing unit is 50 or more. Information recording sheet according to any one of claims 1 to 3, wherein the printable layer is paper having a basis weight of 25g ^/ m ² ~65g / m 2 for the pulp as the main raw material.   5. The information recording sheet according to claim 1, wherein the amount of TVOC when heated at 200 ° C. is 400 ppm or less. The information recording paper has a total thickness of 70 μm to 250 μm;
The information recording paper according to any one of claims 1 to 5, wherein the taper stiffness is 0.5 mN · m to 4.0 mN · m.

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