JPH09231337A - Base material for card and the card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a card base material excellent in productivity, a printing characteristic and a picture transfer characteristic and a card using the card base material. SOLUTION: The card having the card base material has laminated layers 12 consisting of amorphous polyester formed by fusing and extruding the polyester on both faces of paper 10. A magnetic layer 14 is formed on one of the laminated layers 12 and prints 16 are formed on respective layers 12 and protection layers 18 are formed on the surface of the prints 16 and the layers 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a card substrate and a card, and more particularly to a card substrate and a card suitable for magnetic cards, ID cards, prepaid cards and the like.

[0002]

2. Description of the Related Art In recent years, magnetic cards, ID cards, prepaid cards, etc. have come into wide use. As a card base material used for these cards, vinyl chloride and polyethylene terephthalate (PET) are used. A sheet obtained by laminating a sheet such as the above or a film such as vinyl chloride or PET on paper is used.

[0003]

However, when a sheet of vinyl chloride, polyethylene terephthalate (PET) or the like is used as the card substrate, the card substrate becomes expensive and it is difficult to incinerate it. Further, a film obtained by pasting a film of vinyl chloride, PET or the like on paper is obtained by a step of producing a film by extrusion, stretching this film, and then pasting it on paper. For this reason, there are problems that the number of manufacturing steps of the card substrate increases, the cost becomes high, the printability on the film surface is insufficient, and the image transfer characteristics are poor.

Therefore, the object of the present invention is to improve productivity.
An object of the present invention is to provide a card base material that can be obtained at low cost and is excellent in printability and image transfer characteristics, and a card that has the card base material and that has a good printing surface and an image transfer surface.

[0005]

The above-mentioned object can be achieved by a card substrate characterized by having a laminate layer of amorphous polyester on at least one side of paper by hot melt extrusion, and on at least one side of paper. The present invention is achieved by a card having a laminate layer of amorphous polyester by hot melt extrusion and printing on the laminate layer and / or a magnetic layer provided on the laminate layer.

Hereinafter, the present invention will be described in more detail. In the present invention, the base paper constituting the paper is selected from commonly used materials. That is, a natural pulp selected from softwood, hardwood, etc. is used as a main raw material, and if necessary, clay, talc, calcium carbonate, a filler such as urea resin fine particles, rosin, alkyl ketene dimer, higher fatty acid, epoxidized fatty acid amide, paraffin wax. , Sizing agents such as alkenylsuccinic acid, paper strength agents such as starch, polyamide polyamine epichlorohydrin, polyacrylamide, etc.
The one to which a fixing agent such as a sulfuric acid band or a cationic polymer is added is used. Also, epoxidized fatty acid amide,
A softening agent such as a surfactant may be added. Further, synthetic pulp may be used in place of the above natural pulp, or natural pulp and synthetic pulp may be mixed in an arbitrary ratio.

The type and thickness of the base paper substrate are not particularly limited, and can be arbitrarily selected according to the application of the paper used as the card base material. Since the paper of the card substrate is desired to have as high a flatness as possible, it is desirable that the surface of the paper has excellent smoothness and flatness. Therefore, heat and pressure are applied by a machine calender, a soft calender, a super calender, etc. Treatment is preferred.
The paper of the card base material of the present invention is preferably a paper having a surface sizing agent applied to both sides of the base paper.

The surface size liquid is an aqueous solution of polyvinyl alcohol and / or its modified products.
High molecular compounds such as starch, carboxymethyl cellulose, hydroxyethyl cellulose, sodium alginate, cellulose sulfate, gelatin, casein, metal salts such as calcium chloride, sodium chloride and sodium sulfate, hygroscopic substances such as glycerin and polyethylene glycol, dyes, fluorescent A coloring agent such as a whitening agent, a whitening substance, a pH controlling agent such as caustic soda, aqueous ammonia, hydrochloric acid, sulfuric acid, sodium carbonate and the like may be added. Further, a softening agent such as an epoxidized fatty acid amide or a surfactant may be added. Further, a pigment or the like can be added if necessary. As a method for impregnating the base paper, it is preferable to impregnate and apply with a size press, a tab size or a gate roll coaster.

The laminate layer formed by melt extrusion of the thus obtained paper is made of amorphous polyester. As the polyester, a polyester synthesized from a diol and a dicarboxylic acid, a polyester obtained by ring-opening polymerization of caprolactone or a copolymer thereof can be widely used. Examples of the diol include alkylene glycol condensates such as ethylene glycol, diethylene glycol and triethylene glycol, neopentyl glycol, butylene glycol, and bisphenol A to which n ethylene glycols are added at both ends (n is 1 to 10). Etc. As the dicarboxylic acid, terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, 5-sodium sulfoisophthalic acid, cyclohexanedicarboxylic acid and the like can be widely used. As the polyester in the present invention, especially polyethylene terephthalate (PET),
Polyethylene naphthalate (PEN) and the like are suitable,
Polyethylene terephthalate (PET) is particularly preferable.

When these polyesters are laminated on paper by melt extrusion, the polyesters become amorphous. The melt extrusion conditions for obtaining this amorphous polyester film are such that the melted polyester is discharged from the die at a temperature higher than the melting point of the polyester by 20 ° C. or more, and then immediately below the glass transition temperature (Tg) of the polyester. Thus, it is desirable to discharge the melted film on the chill roll maintained at least at 40 ° C. or less. And, surprisingly, the amorphous polyester film thus formed has a property of obtaining a sublimation heat transfer image as compared with a stretched PET film, and an image can be directly provided on the surface of the amorphous polyester film. . Therefore, it is particularly effective for producing an ID card with a facial photograph. It also has excellent printability.

If necessary, the polyester forming the laminate layer may be mixed with a white pigment, a filler or other filler. The type and amount of the white pigment can be appropriately selected from known ones. Further, known additives such as a fluorescent whitening agent and an antioxidant can be added. Examples of white pigments to be filled include titanium dioxide, barium sulfate, barium carbonate, calcium carbonate, lithopone, white alumina, zinc oxide, silica antimony trioxide, and titanium phosphate. These can be used alone or as a mixture. Among these, titanium dioxide and zinc oxide are particularly preferable from the viewpoint of whiteness, dispersibility and stability.

Titanium dioxide may be rutile type or anatase type, and they may be used alone or in combination. Further, it may be made by the sulfuric acid method or the chlorine method. Titanium dioxide includes hydrated alumina treatment, hydrated silicon dioxide-based treatment, zinc oxide treatment or other surface coating treatment with an inorganic substance, trimethylolmethane, trimethylolethane, trimethylolpropane, 2,4-dihydroxy-2-methyl. It is possible to appropriately use a material whose surface is coated with an organic substance such as pentane or a material which is treated with siloxane such as polydimethylsiloxane. The loading amount of the white pigment in the polyester varies depending on the thickness of the white pigment and the polyester to be used, but it is usually selected to be between 5% by weight and 20% by weight.

Further, before laminating the polyester on the paper by melt extrusion, it is preferable to pretreat the paper in order to strengthen the adhesion between the paper and the laminated layer of the polyester. As paper pretreatment, acid etching treatment with chromic sulfuric acid mixture, flame treatment with gas flame,
There are ultraviolet irradiation treatment, corona discharge treatment, glow discharge treatment, anchor coat treatment of alkyl titanate and the like, which can be freely selected. From the viewpoint of simplicity, corona treatment is convenient. In the case of corona treatment, the contact angle with water is 70
° It is necessary to process so that it is below.

As the anchor coating agent, organic titanium type, isocyanate type (urethane type) polyethyleneimine type, polybutadiene type, etc. are known. Specifically, as organic titanium-based materials, alkyl titanates such as tetraisopropyl titanate, tetrabutyl titanate and tetrastearyl titanate, titanium acylates such as butoxytitanium stearate, titanium chelates such as titanium acetylacetonate are known. . Further, as the isocyanate type (urethane type), toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HMDI), xylylene diisocyanate (XD) is used.
I), isophorone diisocyanate (IPDI) and the like are known.

The thickness of the amorphous polyester film formed by melt extrusion varies depending on the application of the card, but is preferably about 5 to 100 μm. If the thickness of the amorphous polyester film is thinner than 5 μm, or if it is thicker than 100 μm, stability in melt extrusion lamination at high speed is insufficient, which is not preferable.

In the present invention, it is desirable to form a melt-extruded laminated layer made of amorphous polyester on both sides of the paper. However, a laminated layer made of polyester is formed on one side of the paper and is formed on the other side of the paper. Is
It may be a laminate of films such as polyester. However, in the case of such a card substrate, the magnetic layer and / or the printing is applied to the melt-extruded laminate layer side made of amorphous polyester in view of printability, image transfer characteristics and the like.

In the card of the present invention, a magnetic layer and / or printing is applied on a laminate layer whose surface is made of the above-mentioned amorphous polyester film. These magnetic layer and / or printing are known components and forming means. Etc. are adopted and there is no particular limitation. And these magnetic layers and /
Alternatively, in the printing, a transparent protective layer can be provided on the magnetic layer and / or the printed surface for improving scratch resistance and preventing sticking when the card is used.

The transparent protective layer which can be used in the present invention is
It consists of at least silicon-modified polyvinyl alcohol and colloidal silica. Silicon modified polyvinyl alcohol is not particularly limited as long as it contains a silicon atom in the molecule, but a silicon atom usually contained in the molecule is an ercoxyl group, an acyloxyl group or a hydroxyl group obtained by hydrolysis or the like. Alternatively, it is preferable to use one having a reactive substituent such as an alkali metal salt thereof. Details of such a method for producing a modified polyvinyl alcohol containing a silicon atom in the molecule are described in JP-A-58-1931.
No. 89 is described.

The colloidal silica used in the present invention is used as a colloidal solution in which ultrafine particles of silicic acid anhydride are dispersed in water using water as a dispersion medium. The particles of colloidal silica have a size of 10 mμ to 100 mμ and a specific gravity of 1.1 to 1.
Three are preferred. In this case, a colloidal solution having a pH value of about 4 to about 10 is preferably used.

The suitable blending ratio of the silicon-modified polyvinyl alcohol and colloidal silica in the present invention is 0.5 to 3 parts by weight, more preferably 1 to 1 part by weight of silicon-modified polyvinyl alcohol.
2 parts by weight. If the amount of colloidal silica used is less than 0.5 parts by weight, the effect of improving transparency is small, and if it is used in an amount of 3 parts by weight or more, the protective layer film is cracked and the transparency is rather lowered.

The transparent protective layer may further contain one or more polymers. Specific examples of the polymer that can be used in combination include methyl cellulose, carboxymethyl cellulose,
Hydroxymethylcellulose, starch, gelatin, gum arabic, casein, styrene-maleic anhydride copolymer hydrolyzate, styrene-maleic anhydride copolymer half ester hydrolyzate, polyvinyl alcohol, carboxy-modified polyvinyl alcohol, polyacrylamide derivative , Water-soluble polymers such as polyvinylpyrrolidone, sodium polystyrene sulfonate and sodium alginate, and styrene-butadiene rubber latex, acrylonitrile-butadiene rubber latex, methyl acrylate-
Examples thereof include water-insoluble polymers such as butadiene rubber latex and polyvinyl acetate emulsion. The amount used in combination is preferably 0.01 to 0.5 parts by weight with respect to 1 part by weight of silicon-modified polyvinyl alcohol.

Pigments, metal soaps, waxes, cross-linking agents and the like are added to the transparent protective layer for the purpose of improving matching with a thermal head during thermal printing and improving water resistance of the transparent protective layer. The pigment is preferably a pigment having a refractive index of 1.4 to 1.55 and a particle size of 1 μm or less. Specifically, there are calcium carbonate, talc, sekiseki, kaolin, aluminum hydroxide, amorphous silica and the like, and the addition amount thereof is 0.
The amount is 05 to 0.5 times, particularly preferably 0.1 to 0.3 times. If the amount is 0.05 times or less, the effect of improving the matching property with the head is small, and if the amount is 0.5 times or more, the transparency is remarkable and the commercial value thereof is impaired.

Examples of the metal soap include emulsions of higher fatty acid metal salts such as zinc stearate, calcium stearate and aluminum stearate, which are contained in an amount of 0.5 to 20% by weight, preferably 1 to 10% by weight based on the total weight of the protective layer. Added in quantity.

As the wax, there are emulsions such as paraffin wax, microcrystalline wax, carnauba wax, methyl roll stearamide, polyethylene wax and silicone, and the total weight of the protective layer is 0.5 to 40.
%, Preferably 1 to 20% by weight.

In order to form a protective layer uniformly,
A surfactant is added to the coating liquid for forming the protective layer. Surfactants include sulfosuccinic acid-based alkali metal salts, fluorine-containing surfactants, and the like. Specifically, sodium salts such as di- (2-ethylhexyl) sulfosuccinic acid and di- (n-hexyl) sulfosuccinic acid. Alternatively, there are ammonium salts and the like. Further, a surfactant, a polymer electrolyte or the like for preventing electrification may be added to the transparent protective layer. The solid coating amount of the transparent protective layer is usually preferably 0.2-5 g / m ^2, more preferably from 1 to 3 g / m ^2.

In order to improve the adhesion between the amorphous polyester laminate layer and the protective layer coated thereon, the surface of the amorphous polyester laminate layer may be subjected to a surface treatment such as corona discharge treatment. .

[0027]

1 is a sectional view showing a preferred embodiment of a card base material of the present invention, and FIG. 2 is a sectional view showing a preferred embodiment of a card of the present invention. In FIG.
10 is paper and 12 is a laminate layer made of amorphous polyester. In FIG. 2, 10 is paper, 12 is a laminate layer made of amorphous polyester, 14 is a magnetic layer, 16 is a printed portion, and 18 is a protective layer.

[0028]

【Example】

Example 1 80% by weight of polyethylene terephthalate (PET),
While 20% by weight of talc powder was dispersed and mixed by a twin-screw kneading extruder, it was laminated on a flame-pretreated 140 μm thick paper by melt extrusion from a T-die at 300 ° C. and 3
A 0 μm amorphous PET film was formed. Also, polyethylene terephthalate (PE
T) 80% by weight and 20% by weight of titanium oxide powder are dispersed and mixed by a twin-screw kneading extruder and laminated by melt extrusion from a T-die at 300 ° C. to form a 30 μm amorphous PET film, and a card substrate. Got

Comparative Example 1 Polyethylene terephthalate (PET) 95% by weight,
Biaxially stretched film with a composition of 5% by weight of talc powder (30μ
m) was pasted on one side of a paper having a thickness of 140 μm with a hot melt adhesive (8 μm), and a biaxially stretched film (30 μm) having a composition of 95% by weight of polyethylene terephthalate (PET) and 5% by weight of titanium oxide powder was used. The opposite surface was bonded with a hot melt adhesive (8 μm) to obtain a card base material.

Comparative Example 2 A biaxially stretched film (100 μm) of polyethylene terephthalate (PET) alone and a biaxially stretched film (100 μm) having a composition of 95% by weight of polyethylene terephthalate (PET) and 5% by weight of titanium oxide powder were hot-melt bonded. A base material for a card was obtained by sticking together with an agent (8 μm).

Next, with respect to the card base materials obtained in Example 1, Comparative Example 1 and Comparative Example 2, the adhesiveness to the magnetic layer and the image transfer characteristics were evaluated. 〔Evaluation method〕

(1) Adhesiveness with Magnetic Layer A barium ferrite magnetic material having a coercive force of 2750 Oersted was applied to the surface of the card base material obtained in Example 1, Comparative Example 1 and Comparative Example 2 as an organic binder (polyurethane). And a liquid containing an organic solvent was applied to form a 40 μm magnetic layer, and a cellophane tape having a width of 1.5 cm was attached to the magnetic layer, and the peel strength when peeled in the direction of 180 ° was measured. .

(2) Image transfer characteristics Sublimation printers (ink: Fujiix) were applied to the card substrates obtained in Example 1, Comparative Example 1 and Comparative Example 2.
VP8100) was used to print yellow with an output of a thermal head of 0.4 W / dot, and Dmax was measured using a reflection densitometer 310 manufactured by X Light Co.

Table 1 shows the measurement results.

[Table 1]

From Table 1, Example 1 shows the adhesiveness with the magnetic layer,
The image transfer characteristics are good, but in Comparative Examples 1 and 2, the adhesiveness to the magnetic layer and the image transfer characteristics are significantly lower than those in Example 1. The card base material of Example 1 can be obtained only by the melt extrusion step, but Comparative Examples 1 and 2 require a laminating step together with a stretching step, and the steps are complicated and the cost for manufacturing the card base material is high. Takes.

As described above, according to the card substrate and the card of the present invention, the adhesiveness with the magnetic layer and the printability due to the image transfer property are excellent, and the polyester is melt extruded onto paper. It can be manufactured only by the laminating process and can be provided at a low cost.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a preferred embodiment of a card base material of the present invention.

FIG. 2 is a sectional view showing a preferred embodiment of the card of the invention.

[Explanation of symbols]

 10 Paper 12 Laminate Layer (Amorphous Polyester) 14 Magnetic Layer 16 Printed Part 18 Protective Layer

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location G11B 5/80 D21H 1/02 C

Claims (4)

[Claims] 1. A base material for a card, which has a laminate layer of amorphous polyester on at least one surface of paper by hot melt extrusion. 2. The card base material according to claim 1, wherein a laminate layer of amorphous polyester is provided on both sides of the paper by hot melt extrusion. 3. A laminate layer of amorphous polyester is formed on at least one side of paper by hot melt extrusion,
A card provided by printing on the surface of the laminate layer and / or providing a magnetic layer on the laminate layer. 4. The card according to claim 3, wherein the laminate layers are formed on both sides of the paper, and the magnetic layers are provided on the printing and / or the laminate layers formed on the surfaces of the laminate layers.