JP2005246750A - Medium with writing layer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a medium with a writing layer excellent in both characteristics, that is, writing properties and scratch-resistant strength. <P>SOLUTION: The medium with the writing layer is constituted of a base layer, the writing layer formed on the base layer and a writable protective layer, which substantially comprises a thermoplastic resin or a photocurable resin, provided on the writing layer. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a medium having a writing layer that can be written with a writing instrument such as a pencil, a ballpoint pen, an aqueous pen, and an oil pen.

  In recent years, ID cards, IC cards, credit cards, cash cards, employee ID cards, ID cards, etc. have added value to themselves, and for example, media such as cards that use the back side of a card as a writing column have been increasing. .

  A medium having such a writing layer is required to have good stamp fixability and various writing properties such as writing properties for pencils, ballpoint pens, water-based pens, and oil-based pens, and good scratch resistance. However, there is a contradictory relationship between the writing property and the scratch strength, and it has not been possible to satisfy both of them.

In order to realize the above two characteristics, there is a technique of forming a writing layer by mixing a porous substance with resin and wax (for example, see Patent Document 1). However, this technique still has insufficient scratch resistance.
JP 2002-79618 A

  An object of the present invention is to provide a medium with a writing layer that is excellent in both the properties of writing property and scratch resistance.

  The medium with a writing layer of the present invention comprises a base material, a writing layer formed on the base material, and a writable protection which is provided on the writing layer and substantially consists of a thermoplastic resin or a photocurable resin. And a layer.

  According to the present invention, a medium with a writing layer excellent in both the characteristics of writing property and scratch resistance can be obtained.

  The medium with a writing layer of the present invention has a base material, a writing layer formed on the base material, and a writable protective layer provided on the writing layer. It consists essentially of a plastic resin or a photocurable resin.

  According to the present invention, since a writable protective layer is further formed on the writing layer, good scratch resistance can be obtained without impairing the writing property of the medium surface.

  In the medium with a writing layer of the present invention, the writing layer can be provided only on at least one main surface of the base material or on both main surfaces. The writing layer can be formed on the entire surface of the base material or at least a part thereof. A plurality of writing layers separated from each other can be formed on each main surface. The writable protective layer may be formed on at least a part of the writing layer. One or a plurality of writing layers and writable protective layers may be provided. The pattern of any layer is arbitrary.

  Hereinafter, the present invention will be described in more detail with reference to the drawings.

  FIG. 1 is a schematic sectional view showing an example of a medium with a writing layer according to the present invention.

  As shown in the drawing, the medium 4 has a configuration in which a writing layer 2 and a writable protective layer 3 are formed in order on one main surface of the substrate 1.

  In FIG. 2, the front view showing the structure of an example of the ID card concerning this invention is shown.

  FIG. 3 is a cross-sectional view taken along the line X-X ′ of the ID card shown in FIG.

  As shown in FIG. 2, the ID card 10 has an image layer 14, a character layer 16, and a signature field 15 formed on a base material 11.

  As shown in FIG. 3, the signature field 15 includes a writing layer 12 and a writable protective layer 13 formed on the writing layer 12.

  In this example, the image layer 14 and the character layer 16 and the signature field 15 are formed on the same main surface. However, the signature field 15 may be provided on the other main surface, respectively. It can also be provided.

  As the writable protective layer, a thermosetting resin or a photocurable resin is used. If importance is attached to the characteristics of scratch resistance, it is preferable to use a thermosetting resin. On the other hand, if importance is attached to stamp fixability, it is preferable to use a photocurable resin. In consideration of productivity, it is preferable to use a photo-curing resin that is rapidly cured, and more preferably an ultraviolet-curing resin.

  Examples of thermosetting resins include alkyd resins, amino-alkyd resins, epoxy resins / fatty acid esters, epoxy resins, polyurethane resins, acrylic resins, acrylic / urethane resins, vinyl resins, fluororesins, polysiloxanes, Acrylic siloxane resins are preferably used. In addition, you may use the said resin 1 type from the said compound etc., or 2 or more types in mixture.

  The photocurable resin used in the writable protective layer includes, for example, a photocurable oligomer, a photocurable monomer, a photoreaction initiator, and the like, and further includes extender pigments, color pigments, and other additives. May be contained. By photocuring, a photocurable oligomer and a photocurable monomer cause a polymerization reaction to form a three-dimensional network structure.

  The thickness of the writable protective layer is preferably smaller than the thickness of the writing layer. If the thickness is greater than the thickness of the writing layer, although it varies depending on the writing tool, writing materials such as ink applied on the writable protective layer are less likely to be fixed on the writing layer, and the stamp fixing property and writing property tend to decrease. There is. Moreover, the specific thickness of the writable protective layer is more preferably in the range of 1 μm to 3 μm. If it is less than 1 μm, there is a tendency that sufficient scratch resistance cannot be obtained. On the other hand, when it exceeds 3 μm, the stamp fixing property and the writing property tend to be lowered. The layer forming method may be any method that can form the above thickness, but preferably includes offset printing and gravure printing.

  The writing layer preferably contains a porous substance and a resin.

  As the resin that can be used for the writing layer, a resin that can fix the porous substance to the substrate is preferably selected. For example, shellac, rosin and derivatives thereof, nitrified cotton and fiber derivatives, polyamide resin, polyacrylate resin, polyvinyl chloride resin, polyvinyl acetate resin, polystyrene resin, petroleum resin, cyclized rubber, chlorinated rubber, chlorinated polypropylene, Urethane resin, epoxy resin, polyester resin, acrylic resin, vinyl chloride, vinyl chloride-vinyl acetate copolymer, butyral resin, vinylidene chloride resin, water-soluble resin, and the like can be used. Preferably, a polyester resin, a polyamide resin, a urethane resin, or an acrylic resin can be used. Alternatively, a UV ink containing a prepolymer that is copolymerized and cured by ultraviolet rays may be used. Examples of the copolymerizable compound used therefor include polyol acrylate, polyester acrylate, epoxy acrylate, urethane acrylate, and alkyd acrylate. Among these, polyester resins, polyacrylate resins, polyvinyl chloride resins, polyvinyl acetate resins, polyamide resins, and polystyrene resins are preferably used. In addition, as said resin, you may use 1 type from the said compound etc., or 2 or more types in mixture.

  The porous material that can be used for the writing layer only needs to have a property of receiving stamp ink or the like. Examples of the porous material include silica (sedimentable or gel type), talc, kaolin, clay, alumina white, calcium carbonate, barium sulfate, etc., and these may be used alone or in combination of two or more. Can do. As a preferable porous material, silica (sedimentable or gel type) can be used. Moreover, in order to give a color to a writing layer, compounds other than the above can be added. The porous material preferably has an average particle diameter of 1 to 6 μm, more preferably 2 to 4 μm.

  The writing layer preferably has a thickness of 2 μm to 100 μm. More preferably, the thickness of the writing layer is 10 μm to 20 μm. The method for forming the writing layer is not particularly limited as long as it can form a layer having the above thickness.

  The compounding ratio of the resin and the porous material in the writing layer is preferably 20:80 to 80:20, more preferably 40:60 to 60:40. Within this range, the porous material can be satisfactorily fixed on the substrate.

  The substrate is preferably provided in a layered form. Examples of materials used for such substrates are, for example, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate-vinyl alcohol copolymer, vinyl chloride-vinyl acetate-maleic acid copolymer. Chlorine-containing polymers such as polymers, vinyl chloride-acrylate copolymers, polyvinylidene chloride, vinylidene chloride-vinyl chloride copolymers, vinylidene chloride-acrylonitrile copolymers, such as polyethylene terephthalate resin, polybutylene terephthalate resin, or terephthalic acid Or a polyester resin such as a condensation ester resin (for example, PETG: a trademark of Eastman Chemical Co.) of an acid component such as isophthalic acid and an alcohol component such as ethylene glycol or cyclohexanedimethanol, for example, a polylactic acid resin, starch and modified Examples include natural polymer resins composed of rivinyl alcohol, biodegradable plastic resins such as microbe-produced resins composed of β-hydroxybutyric acid and β-hydroxyvaleric acid, and polyamide resins, acrylic resins, and silicone resins. These can be used alone or in combination. This combination can be applied as a mixture or as a stack of any combination of these.

  The writing layer can be formed by any method such as a gravure coating method, a bar coating method, and a reverse roller coating method. Preferably, a bar coating method can be used. If this method is used, there exists an advantage that coating stability is easy to ensure.

  The thermosetting resin and the photocurable resin used for the writable protective layer can be formed by the above-described method, and preferably can be formed by an offset printing method. When applied using the offset printing method, it is difficult for the thermosetting resin and the photocurable resin to penetrate into the writing layer composed of the porous material and the resin, and the ink adsorbing portion of the writing instrument can remain. There is an advantage that

  In addition, a recording material layer such as characters and images can be formed on the medium with a writing layer of the present invention as necessary. Examples of such a recording material include materials capable of recording information electrically, magnetically, or optically. The recording material layer can be arbitrarily formed on the substrate, the writing layer, and the writable protective layer. For example, it may be provided on the same surface as the surface on which the writing layer is provided, or may be provided on the surface opposite to this surface. Furthermore, the writing layer may be provided on the surface opposite to the surface in FIG. 1 or a part or both of the both surfaces, or may be provided at another position on the same surface. The recording material layer may be printed by a printing method such as an inkjet method, a sublimation method, or a thermal transfer method.

Example 1
A PET film having a thickness of 0.5 mm was prepared as a substrate.

  Next, a writing layer material having the following composition was prepared.

Written layer material composition Silica 50 parts by weight Modified urethane resin 50 parts by weight Styrene / alkyl methacrylate / alkyl acrylate copolymer
30 parts by weight Cationic polymer 10 parts by weight Polyhydroxyalkane polyglycidyl ether 10 parts by weight The above material was applied onto a substrate by a gravure printing method to obtain a writing layer having a thickness of 20 μm.

  Next, as a thermosetting resin that can be used as a material for the writable protective layer, a single color machine OP varnish (dry type) (manufactured by Toyo Ink) is prepared, and this is put into an ink fountain of an offset printing machine. By passing the coated base material through an offset printing machine, a writable protective layer having a thickness of 2 μm was formed on the writing layer, and the medium with the writing layer of the present invention having the same configuration as that of FIG. 1 was obtained.

  The obtained medium with a writing layer was subjected to a stamp fixing test, a writing test, and a scratch resistance test as follows.

Stamp Fixability Test A stamp having a predetermined pattern was applied to the surface of the writable protective layer, and the elapsed time when bleeding did not occur was measured by rubbing 10 times with a dry cloth every 30 seconds.

Writability test Using a pencil, oil-based pen, water-based pen, and ballpoint pen on the surface of the writable protective layer. Each was written, and the case where no bleeding occurred was evaluated as ◯, and the case where bleeding occurred was evaluated as ×.

Scratch-resistant strength test The apparatus used for the scratch-resistant strength test has a sapphire needle (0.5R60) and a weighting unit that applies weight to the sapphire needle. The weight of the weighted part was placed, the sapphire needle (0.5R60) was brought into contact with the surface of the writable protective layer, and reciprocated 5 times with a width of 30 mm, and the occurrence of scratches was observed. The same observation was performed while increasing the weight of the weighted portion by 5 g, and the weight of the weight at the time when the scratch occurred was measured.

  The results of these tests are shown in Table 1 below.

Example 2
A PET film having a thickness of 0.5 mm was prepared as a substrate.

  Next, a writing layer material having the following composition was prepared.

Written layer material composition Silica 50 parts by weight Modified urethane resin 50 parts by weight Styrene / alkyl methacrylate / alkyl acrylate copolymer
30 parts by weight Cationic polymer 10 parts by weight Polyhydroxyalkane polyglycidyl ether 10 parts by weight The above material was applied onto a substrate by a gravure printing method to obtain a writing layer having a thickness of 20 μm.

  Next, as an ultraviolet curable resin that becomes a material for the writable protective layer, the thickness is obtained by gravure printing on the writing layer in the same manner as in Example 1 except that UV161OP varnish (manufactured by T & K TOKA) is used. A 2 μm ultraviolet curable resin layer was formed to produce a medium with a writing layer of the present invention.

  About the obtained medium with a writing layer, the test similar to Example 1 was done. The results are also shown in Table 1 below.

Comparative Example A PET film having a thickness of 0.5 mm was prepared as a substrate.

  Next, a writing layer material having the following composition was prepared.

Silica 50 parts by weight Modified urethane resin 50 parts by weight Styrene / alkyl methacrylate / alkyl acrylate copolymer
30 parts by weight Cationic polymer 10 parts by weight Polyhydroxyalkane polyglycidyl ether 10 parts by weight The above materials are coated on a substrate by a gravure printing method to form a writing layer having a thickness of 20 μm. The attached medium was obtained.

About the obtained medium with a writing layer, the test similar to Example 1 was done. The results are also shown in Table 1 below.

  As a result, it was confirmed that Example 1 using the thermosetting resin and Example 2 using the photo-curing resin were superior to the comparative examples in various writing properties and scratch resistance. In Example 1 using a thermosetting resin, the stamp fixability was 3 minutes, but it was confirmed that the scratch resistance was as excellent as 200 g. Moreover, although Example 2 using a photocurable resin has a scratch resistance of 150 g, it was confirmed that the stamp fixing property was excellent at 1 minute.

From the above results, it was confirmed that in the medium with a writing layer, the medium with a writing layer of the present invention in which a writable protective layer was provided on the writing layer was excellent in both writing property and scratch resistance.

  The medium with a writing layer of the present invention can be used as a personal authentication medium such as an ID card, IC card, credit card, cash card, employee card, and ID card.

Schematic sectional view showing an example of a medium with a writing layer of the present invention Front view showing an example of an ID card according to the present invention X-X 'sectional view of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,11 ... Base material, 2,12 ... Written layer, 3,13 ... Writable protective layer, 4 ... Medium, 10 ... ID card, 14 ... Image layer, 15 ... Signature column, 16 ... Character layer

Claims (6)

  Comprising a base material, a writing layer formed on the base material, and a writable protective layer provided on the writing layer and substantially composed of a thermoplastic resin or a photocurable resin. Medium with writing layer.   The medium with a writing layer according to claim 1, wherein the writable protective layer has a thickness of 1 μm to 3 μm.   The medium with a writing layer according to claim 1, wherein the writing layer contains a resin and a porous substance.   The medium with a writing layer according to any one of claims 1 to 3, wherein the resin includes at least one selected from the group consisting of a polyester resin, a polyamide resin, a urethane resin, and an acrylic resin. .   The writing layer according to any one of claims 1 to 4, wherein the porous material includes at least one selected from the group consisting of silica, talc, kaolin, clay, alumina white, calcium carbonate, and barium sulfate. Media with.   The medium with a writing layer according to claim 1, wherein the writing layer has a thickness of at least 2 μm to 100 μm.

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