JPH10138429A - Substrate for card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide concealing property, cushioning property, clearness in printing and print adhesive property, which are necessary for the substrate for various cards, by a method wherein a polyester film, a polyester film containing a specified amount of particles, a polyester film containing fine bubbles, and a resin are laminated in the sequence. SOLUTION: A polyester film A, a polyester film B, containing 0.5-25wt.% of particles, a polyester film C, containing fine bubbles, and a resin D are laminated in the sequence of A/B/C/D to form a substrate for a card. The actual examples of particles, contained in the polyester film B, are titanium oxide, barium sulfate, calcium carbonate and the like while the polyester film C containing fine bubbles can be any polyester film containing fine bubbles and the polyester film, in which non-compatible thermoplastic resin is contained into polyester to make a film, is preferable. The actual examples of the resin D are polyvinyl butyral, polyvinyl acetal, polyester graft polyacrylate and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a card base material, and more particularly, to an identification card and an IC with external terminals.
Cards, credit cards with magnetic stripes, prepaid cards, more specifically, driver's license cards, bank cards, customer identification cards at department stores, insurance medical cards, business cards, various licenses, identification cards, membership cards, etc. IC cards such as personal identification cards or information cards and IC cards for electronic money, telephone cards, vehicle cards,
The present invention relates to a card base such as a prepaid card such as a shopping card.

[0002]

2. Description of the Related Art In recent years, various cards such as bank cards,
Customer identification cards for department stores, medical insurance cards, business cards,
Personal identification cards such as various licenses, identification cards, membership cards or information cards, various IC cards, telephone cards,
On the surface of a card base material such as a prepaid card card such as a vehicle card or a shopping card, character image information such as a face photograph, a landscape photograph, a design, a first name, a last name, an address, and a date of birth are printed and used. ing. Many print recording methods are performed by the dye thermal diffusion recording method typified by video printers and sticker photos, etc., and are created more efficiently than when cards are created by pasting actual photos. it can. However, the card base material on the image receiving layer side on which printing is recorded is mainly made of vinyl chloride, vinyl chloride / vinyl acetate copolymer, polyester resin, etc., and has poor cushioning properties. There were many things lacking.

[0003]

The problem to be solved by the present invention is as follows.
An object of the present invention is to provide a substrate having sufficient concealing properties, cushioning properties, print clarity, and print adhesiveness, and useful for various cards.

[0004]

Means for Solving the Problems In view of the above-mentioned circumstances, the present inventors have made intensive studies, and as a result, have found that a base material having a specific structure can solve the above-mentioned problems, thereby completing the present invention. Reached. That is, the gist of the present invention is that the polyester film (A), the polyester film (B) containing 0.5 to 25% by weight of particles, the polyester film (C) containing fine bubbles, and the resin (D) are made of A / B / C. / D, which has a structure laminated in the order of / D.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. The polyester film referred to in the present invention is a film extruded by a so-called extrusion method, which is melt-extruded from an extrusion die, and is a film that is later oriented in one of the longitudinal direction or the lateral direction, or the longitudinal direction. It is a film oriented in biaxial directions, i.e., direction and lateral direction.

In the present invention, the polyester is obtained by polycondensing an aromatic dicarboxylic acid and an aliphatic glycol. As aromatic dicarboxylic acids, terephthalic acid,
Examples of 2,6-naphthalenedicarboxylic acid include aliphatic glycols such as ethylene glycol, diethylene glycol, and 1,4-cyclohexanedimethanol. Representative polyesters include polyethylene terephthalate (PET), polyethylene-2,
6-naphthalenedicarboxylate (PEN) and the like are exemplified.

The polyester used in the present invention may be a copolymer containing a third component. As the dicarboxylic acid component of the copolymerized polyester, isophthalic acid, phthalic acid, terephthalic acid, 2,6-naphthalenedicarboxylic acid,
One or two or more of adipic acid, sebacic acid, and oxycarboxylic acid (for example, P-oxybenzoic acid and the like) are included, and the glycol component includes ethylene glycol, diethylene glycol, propylene glycol, butanediol, and 1,4. And one or more of cyclohexanedimethanol neopentyl glycol and the like.

In the present invention, the polyester film (A) is usually a single layer, but may be composed of a plurality of layers whose main components are polyester. Recycled polyester raw materials can be mixed in each layer in the polyester film (A). Further, each layer in the polyester film (A) does not essentially need to contain particles, but may contain one or more kinds of particles.
As the particles to be contained, for example, silicon dioxide, calcium carbonate, aluminum oxide, titanium dioxide, kaolin, talc, zeolite, lithium fluoride, barium sulfate, carbon black, as described in JP-B-59-5216 And heat-resistant polymer fine powder. The average particle size of the particles is not particularly limited, but is 0.05 to 1 μm, and more preferably 0.05 to 1 μm.
0.7 μm, particularly preferably 0.05 to 0.5 μm.

In the present invention, the particles contained in the polyester film (B) are not particularly limited, but white particles such as titanium oxide, barium sulfate, calcium carbonate, silicon dioxide, zinc oxide and magnesium carbonate are preferred. In particular, titanium oxide is particularly preferable in terms of concealability, handleability, and the like. In the present invention, the average particle size of the particles contained in the polyester film (B) is not particularly limited, either, but is 0.05 to 1 μm, more preferably 0.05 to 0.7 μm, particularly 0.05 to 0. 5 μm is preferred.

The content of the particles contained in the polyester film (B) is 0.5 to 25% by weight, preferably 1 to 2%.
0% by weight, more preferably 2 to 20% by weight. When the content of the titanium oxide particles is less than 0.5% by weight, the degree of concealment of the sheet is reduced, and the sharpness when the sheet is printed or the like is reduced, or the print is transparent and the opposite side of the sheet is printed. It is not preferable because overlapping printing becomes difficult to see. On the other hand, if the particle content exceeds 25% by weight, breakage is likely to occur during film formation, which is not preferable.

In the present invention, the fine-bubble-containing polyester film (C) may be any polyester film containing fine bubbles, and is formed by incorporating a thermoplastic resin substantially incompatible with polyester. Thus, a microbubble-containing polyester film obtained is preferred. Specific examples of the thermoplastic resin substantially incompatible with polyester include polyolefins such as polypropylene, polyethylene, polymethylpentene and polymethylbutene, and thermoplastic resins such as polystyrene and polycarbonate. Among these, polypropylene is particularly preferred from the viewpoint of cost and productivity.

The polypropylene is preferably a crystalline polypropylene having 95 mol% or more, more preferably 98 mol% or more of propylene units. The melt flow index (MFI) of the polypropylene is not particularly limited, but is usually in the range of 0.5 to 30 g / 10 min, preferably 1 to 15 g / 10 min. In the present invention, the content of the thermoplastic resin substantially incompatible with the polyester contained in the fine bubble-containing polyester film (C) is usually 5 to 45% by weight, preferably 5 to 45% by weight.
The range is 35% by weight, more preferably 10 to 25% by weight. When the content of the thermoplastic resin substantially incompatible with the polyester contained in the microbubble-containing polyester film (C) is less than 5% by weight, the amount of bubbles formed in the film is reduced. For example, to reduce
There is a tendency that the card base cushioning property is reduced and the print clarity is reduced. On the other hand, when the content exceeds 45% by weight, the film tends to be easily broken during film formation.

In the present invention, the density of the fine bubble-containing polyester film (C) is usually 0.4 to 1.3 g / cm.
³ , preferably 0.55 to 1.2 g / cm ³ , more preferably 0.7 to 1.1 g / cm ³ . The density of the fine bubble-containing polyester film (C) is 0.4 g
If it is less than / cm ³ , the film tends to be broken during film formation and the productivity tends to be poor. When the density of the fine bubble-containing polyester film (C) exceeds 1.3 g / cm ³ , the cushioning property tends to be impaired.

The polyester film (C) containing fine bubbles preferably contains the same amount of particles as those contained in the polyester film (B). The method for incorporating particles into the polyester in the present invention is not particularly limited, and a known method can be employed. For example, it can be added at any stage of producing the polyester, but is preferably added as a slurry dispersed in ethylene glycol or the like at the esterification stage or at the stage before the end of the transesterification reaction and before the start of the polycondensation reaction, The polycondensation reaction may proceed. Also, a method of blending a slurry of particles dispersed in ethylene glycol or water with a polyester material using a kneading extruder with a vent, or a method of blending the dried particles with a polyester material using a kneading extruder, etc. Done.

In the present invention, the method of incorporating a thermoplastic resin which is substantially incompatible with the polyester is not particularly limited. This is carried out by a method such as dry-blending an incompatible thermoplastic resin with the thermoplastic resin, and can be contained by supplying to an extruder.

In the present invention, if necessary, the polyester or the thermoplastic resin substantially incompatible with the polyester may contain a fluorescent whitening agent, an antioxidant, a heat stabilizer, a lubricant, an antistatic An additive such as an agent, a dye or a pigment may be blended. In the present invention, as the resin (D),
Resins such as polyvinyl butyral, polyvinyl acetal, polyester graft polyacrylate, and polyurethane are used. Note that these resins may be used in appropriate combination. Further, if necessary, an antifoaming agent, a coating improver, a thickener, an antistatic agent, an organic lubricant, an organic polymer particle, an antioxidant, an ultraviolet absorber, a foaming agent, a light absorbing substance, It may contain a light reflecting material, a pigment, and the like.

In the present invention, the method of laminating the above-mentioned resin on a polyester film is not particularly limited, but may be carried out in a film forming step or in a film by a usual coating method such as a gravure coating method or a rod coating method. It can be applied and laminated after the film forming process. The thickness of the applied resin after drying is usually 0.1 to 30 μm,
Preferably 0.2 to 20 μm, more preferably 0.5
It is preferable to apply in the state of dilution with a solvent or in the form of an emulsion so as to be in the range of 10 to 10 μm. When the value is less than 0.1 μm, the printing adhesiveness when printing or the like is performed may be reduced. When the value is more than 30 μm, drying of a solvent or the like may be insufficient. .

In the present invention, the thickness of the polyester film (A) is not particularly limited as long as it can be formed into a film, but is preferably 100 to 450 μm, more preferably 200 to 400 μm. The polyester film (B) may have any thickness as long as it can be formed into a film, but preferably has a thickness of 10 to 200 μm, more preferably 20 to 100 μm. The fine-bubble-containing polyester film (C) may have any thickness as long as it can be formed as a film, but preferably has a thickness of 10 to 200 μm.
m, more preferably 20 to 100 μm. In addition,
These films may be laminated films.

The thickness of the card substrate in the present invention is usually 150 to 850 μm, preferably 250 to 75 μm.
0 μm, more preferably 350 to 650 μm.
Next, the method for producing a polyester film in the present invention will be specifically described, but the film of the present invention is not limited to the following production examples. That is, it is preferable to use the above-mentioned polyester raw material, melt extrude from a die using an extruder, and cool and solidify with a cooling roll to obtain an unstretched sheet. In this case, in order to improve the flatness of the sheet, it is necessary to increase the adhesion between the sheet and the rotary cooling drum, and the electrostatic application adhesion method and / or the liquid application adhesion method are preferably employed.

Next, a method of biaxially stretching the obtained unstretched film by stretching it biaxially will be described. That is, first, the unstretched sheet is stretched in one direction by a roll or tenter type stretching machine. The stretching temperature is usually 70 to 120 ° C, preferably 80 to 110 ° C,
The stretching ratio is usually 2.5 to 7 times, preferably 3.0 to 6 times.
It is twice. Next, stretching is performed in a direction orthogonal to the stretching direction of the first stage. The stretching temperature is usually from 70 to 130 ° C, preferably from 80 to 120 ° C, and the stretching ratio is usually from 3.0 to 3.0 ° C.
It is 7 times, preferably 3.5 to 6 times. Subsequently, heat treatment is performed at a temperature of 170 to 250 ° C. under tension or relaxation within 30% to obtain a biaxially oriented film. During the stretching step, so-called in-line coating for treating the film surface can be performed. Although it is not limited to the following, especially after the first-stage stretching is completed,
Before the second stretching, a coating treatment with a water-soluble, water-based emulsion, water-based slurry, or the like can be performed for the purpose of improving antistatic properties, slip properties, adhesion, and the like, and improving secondary workability.

In the above-mentioned stretching, stretching in one direction is performed by 2
It is also possible to use a method of performing the above steps. In that case,
It is preferable that the stretching is performed so that the stretching ratio in the two directions finally falls within the above range. It is also possible to simultaneously biaxially stretch the unstretched sheet so that the area magnification becomes 10 to 40 times. Further, if necessary, the film may be stretched in the longitudinal and / or transverse directions again before or after the heat treatment.

In the present invention, the method of compounding the polyester film (A), the polyester film (B), and the fine-bubble-containing polyester film (C) is not particularly limited.
A method in which an adhesive or the like is interposed between the films to form a composite by laminating the films together, a so-called extrusion laminating method in which the films are laminated while extruding the film directly from an extruder onto the film, a plurality of methods. A plurality of raw materials can be extruded from an extruder and combined in a die to form a film. Further, these methods may be combined.

Among these composite methods, a polyester film (A), a polyester film (B), a polyester film containing fine bubbles (C) using an adhesive.
An example of a method for compounding is described. That is, it is necessary that a resin adhesive is interposed between the polyester films to be bonded. The resin-based adhesive is not particularly limited. For example, a polyurethane resin-based adhesive, a number average molecular weight of 5,000
~ 20,000 epoxy resin and acid anhydride curing agent
An adhesive made of a resin containing a weight ratio of 0/30 to 99/1 or an adhesive made of a resin containing a polyester resin and an aminoplast resin in a weight ratio of 70/30 to 90/10. Anything should do.

The polyurethane resin may be a one-part adhesive or a two-part adhesive as long as it is obtained from the reaction between a diisocyanate compound and an active hydrogen compound such as a polyol. As the one-component adhesive, for example, a so-called moisture-curable polyurethane resin which is cured by reacting an isocyanate prepolymer obtained by reacting a polyol with a diisocyanate with moisture in the air and on the surface of an adherend is exemplified. Further, urethane acrylate of a type in which hydroxy acrylate is cured by radiation, for example, ultraviolet light, electron beam, or the like, on the isocyanate prepolymer is also included. Examples of the two-part adhesive include polyurethane resins obtained by the reaction of a polyol and a polyisocyanate or a terminal isocyanate prepolymer, a terminal hydroxyl group prepolymer and a terminal isocyanate prepolymer. As the diisocyanate compound used here, 4,4′-diphenylmethane diisocyanate,
Examples thereof include 2,4- / 2,6-tolylene diisocyanate, hexamethylene diisocyanate, m-xylylene diisocyanate, and isophorone diisocyanate.
Examples of active hydrogen compounds such as polyols include ethylene glycol, diethylene glycol, dipropylene glycol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, trimethylolpropane, 3-methylpentanediol, and 2-hydroxyethyl. Low molecular weight polyols such as acrylates, polyethylene glycol, polyoxyethylene glycol, copolymers of ethylene oxide and propylene oxide, polyether polyols such as polytetramethylene ether glycol, poly β-methyl δ-valerolactone, polycaprolactone, Polyester polyol such as polyester from diol such as ethylene glycol and dibasic acid such as adipic acid, castor oil, liquid polybutadiene, epoxy resin, polycarbonate Diol, acrylic polyol, neoprene, silicone polyol, ethylenediamine, butyl alcohol, isobutyl alcohol, water,
And propionic acid.

The epoxy resin forming the adhesive comprising the epoxy resin and the acid anhydride is preferably a bisphenol-type epoxy resin obtained by reacting bisphenol with epichlorohydrin. The acid anhydride-based curing agent is preferably selected from trimellitic anhydride-based curing agents including trimellitic anhydride, glycerol tristrimellitate anhydride, and trimellitic anhydride derivatives. Further, in addition to the acid anhydride-based curing agent, another curing agent such as a phenol resin may be included. As the polyester resin forming the adhesive composed of the polyester resin and the aminoplast resin, a known polyester resin may be used alone, or an epoxy resin-modified polyester resin modified with an epoxy resin or the like may be used. As the aminoplast resin, a melamine resin, a benzoguanamine resin, or the like can be used.

The method for applying the adhesive to the polyester film is not particularly limited, but includes an air doctor coating method, a flexible blade coating method, a rod coating method, a floating knife coating method, a knife over blanket coating method, and a knife. Over roll coating, squeeze coating, impregnation coating, reverse roll coating, transfer roll coating, gravure coating, kiss roll coating, bead coating,
It can be applied by a known method such as a cast coating method, a spray coating method, a curtain coating method, a fountain coating method, and a calendar coating method.

The coating thickness of the adhesive is usually 0.3 to 30 μm, preferably 0.6 to 20 μm after drying.
More preferably, one or two or more solvents such as methyl ethyl ketone, toluene, ethyl acetate, xylene, and butyl cellosolve are mixed to dilute the adhesive so that the adhesive is in the range of 1 to 10 μm. Is preferred. When this value is less than 0.3 μm, the adhesive strength at the time of bonding tends to be low, and this value is 30 μm
When it exceeds, drying of the solvent may be insufficient.

A composite polyester film can be obtained by pressure bonding or heat pressing with an adhesive interposed between the polyester films. At this time, the adhesive layer may be applied on one side of the film or on both sides. The method of pressing or heating and pressurizing is not particularly limited.For example, a method in which an adhesive is interposed between films to be combined between rolls or heated rolls with an adhesive interposed therebetween, and a method of passing while pressing, press or It can be performed by a method such as a method of pressurizing or heating and pressing using a hot press machine.

The layer structure of the card base material in the present invention is as follows:
For example, D / C / B / A / B / C / D, D / C / B / A
/ B, A / B / C / D, etc., and in any case, it is necessary to have a configuration of A / B / C / D as a part of the card base material. Here, the resin layer (D) is the printing adhesiveness of the printing record, the C layer is cushioning and concealing properties, the B layer is concealing properties, the A layer is a base for compounding the B and C layers, and a recycled material. This is a layer for mixing each, and plays a role of each, and is configured to function as a card base material.

[0030]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist of the present invention. In the examples and comparative examples, “parts” means “parts by weight”. The measuring method used in the present invention is as follows. (1) Average particle diameter (d _50: [mu] m) centrifugal sedimentation particle size distribution analyzer (manufactured by Shimadzu Corporation SA-CP3 Model) accumulated in the equivalent sphere distribution measured using (by weight) 50% of the value The average particle size was used.

(2) Concealment Using a Macbeth densitometer “TD-904”, the transmission density by visual light was measured. This measurement was repeated five times, and the arithmetic average value of the measurement results was defined as the degree of hiding. The larger this value, the lower the light transmittance and the higher the concealment. (3) Density of Polyester Film Containing Fine Bubbles A 10 cm × 10 cm square film sample is cut out from an arbitrary portion of the film, the thickness is measured at 9 points at an arbitrary position with a micrometer, and the average value is calculated.
The area of the cut sample is multiplied by the average thickness to calculate the volume of the film. Next, the weight of the cut film sample was measured and divided by the volume to obtain a density. This operation 5
This was repeated twice and the arithmetic average value was defined as the density of the polyester film containing fine bubbles.

(4) Melt flow index (MF)
I) Test temperature 23 according to JIS K 7210-1976
The test was performed at 0 ° C. under a test load of 2.16 kgf and expressed as the mass of the sample extruded for 10 minutes. This test was repeated three times, and the arithmetic average of the results was used as the melt flow index. (5) Cushioning property OZAKI SEISAKUSHO CO. , LTD, PEACOCK No. 25 UPRIGH DIA
The sheet thickness (t1) was measured using L GAUGE. Next, a 1 kg weight was placed on the measuring element, and the sheet thickness (t2) was measured. Using these values, the cushion ratio was calculated by the following equation.

## EQU1 ## Cushion rate (%) = 100 × (t1−t2) / t1 When this value is 5% to 30%, good cushioning property is obtained.
Is less than the cushioning property, and when it exceeds 30%, the cushioning property is excessive.

(6) Print sharpness An image was printed on a sample using a color video printer VH-P20 manufactured by KEYENCE CORPORATION in a room at a temperature of 23 ° C. and a humidity of 50% RH, and the printed image was visually observed. Observed and divided into the following ranks. ：: The image is clear (a level with no practical problem) Δ: The image is slightly clear (a level with no practical problem) ×: The image is unclear (a level with practical problem)

(7) Print Adhesion An image was printed on a sample using a color video printer VH-P20 manufactured by KEYENCE CORPORATION in a room at a temperature of 23 ° C. and a humidity of 50% RH. Was rubbed with the fingers of a hand, and the printed images were visually observed for the degree of bleeding, and classified into the following ranks. ：: There is no image bleeding (a level with no practical problem) Δ: There is some image bleeding (a level with no practical problem) ×: There is a lot of image bleeding (a level of practical problem)

<Production of Polyester> Production Example 1 (Polyester K) 100 parts of dimethyl terephthalate, 60 parts of ethylene glycol and 0.09 part of magnesium acetate tetrahydrate were placed in a reactor, heated to an elevated temperature, and methanol was distilled off. A transesterification reaction was carried out, and it took 4 hours from the start of the reaction to raise the temperature to 230 ° C., thereby substantially terminating the transesterification reaction. Next, an ethylene glycol slurry containing 0.1 part of silica particles having an average particle diameter (d ₅₀ ) of 1.54 μm was added to the reaction system, and 0.04 part of ethyl acid phosphate and 0.01 part of germanium oxide were further added. After 100 minutes, the temperature reached 280 ° C and the pressure reached 15 mmHg. Thereafter, the pressure was gradually reduced and finally 0.3 mmHg.
And After 4 hours, the pressure in the system is returned to normal pressure, and polyester K
I got The content of the silica particles of the polyester K is 0.1
% By weight.

Production Example 2 (Polyester L) The procedure of Production Example 1 was repeated except that an ethylene glycol slurry containing 0.1 part of silica particles having an average particle diameter (d ₅₀ ) of 1.54 μm was not added to the reaction system. Polyester L was obtained in the same manner as in Example 1. Production Example 3 (Polyester M) 70 parts of the polyester L produced in Production Example 2 and 30 parts of titanium oxide particles having an average particle diameter of 0.27 μm were dry-blended and extruded using a twin-screw kneading extruder to obtain polyester M. Was. The content of the titanium oxide particles in the polyester M was 30% by weight.

Production Example 4 (Polyester N) 85 parts of the polyester L produced in Production Example 2 and 15 parts of titanium oxide particles having an average particle size of 0.27 μm were dry-blended and extruded using a twin-screw kneading extruder. N was obtained. The content of titanium oxide particles in Polyester N was 15% by weight. Production Example 5 (Polyester O) 93 parts of the polyester L produced in Production Example 2 and 7 parts of titanium oxide particles having an average particle size of 0.27 μm were dry-blended and extruded using a twin-screw kneading extruder to obtain polyester O. Was. The content of titanium oxide particles in Polyester O was 7% by weight.

Production Example 6 (Polyester P) 99.9 parts of polyester L produced in Production Example 2 and 0.1 part of titanium oxide particles having an average particle diameter of 0.27 μm were dry-blended, and the mixture was extruded using a twin-screw kneading extruder. And extruded to obtain a polyester P. The content of the titanium oxide particles in the polyester P was 0.1% by weight.

<Production of Polyester Film> Production Example 7 (Fine-bubble-containing polyester film C1) 83 parts of polyester O dried in an inert gas atmosphere at 180 ° C. for 4 hours, melt flow index (MF)
I) A raw material obtained by dry-blending 17 g of crystalline polypropylene of 10 g / 10 min at 290 ° C. by a melt extruder.
And extrude at a surface temperature of 4 using the electrostatic contact method.
It was cooled and solidified on a cooling roll set at 0 ° C. to obtain an unstretched sheet. The obtained sheet was stretched in the longitudinal direction by 3.4 times at 85 ° C. Next, the film was guided to a tenter and heated to 110 ° C.
After stretching 3.2 times in the transverse direction, heat fixing was performed at 230 ° C. to obtain a polyester film (C1) containing fine bubbles having a thickness of 38 μm. The density of the obtained film is 0.
It was 93 g / cm ³ .

Production Example 8 (Polyvinyl Film Containing Polyvinyl Butyral Resin Laminated Microcellular Film CV1) The polyester film C1 containing fine cells obtained in Production Example 7 was added with a weight average molecular weight of 60000 and a degree of butyralization of 6
A 0% polyvinyl butyral resin is diluted with a mixed solvent of toluene / ethanol = 60/40 (weight ratio) so as to have a resin concentration of 10%, and coated with a gravure roll so that the thickness after drying becomes 1 μm. , Polyvinyl butyral resin laminated polyester film containing fine bubbles (CV
1) was obtained.

Production Example 9 (Polyester film C2 containing fine bubbles) 81 parts of polyester O dried at 180 ° C. for 4 hours in an inert gas atmosphere, melt flow index (MF)
I) A microbubble-containing polyester film (C2) having a thickness of 38 μm was obtained in the same manner as in Production Example 7, except that a raw material obtained by dry blending 19 parts of crystalline polypropylene with 10 g / 10 minutes was used. The density of the film is 1.0
It was 5 g / cm ³ .

Production Example 10 (Polyester film CV2 containing fine cells laminated with polyvinyl butyral resin) The polyester film C1 containing fine cells obtained in Production Example 9 was added with a weight average molecular weight of 60000 and a degree of butyralization of 6
A 0% polyvinyl butyral resin is diluted with a mixed solvent of toluene / ethanol = 60/40 (weight ratio) so as to have a resin concentration of 10%, and coated with a gravure roll so that the thickness after drying becomes 1 μm. , Polyvinyl butyral resin laminated polyester film containing fine bubbles (CV
2) was obtained.

Production Example 11 (Polyester Film B1) Polyester N produced in Production Example 4 was dried at 180 ° C. for 4 hours in an inert gas atmosphere, and then dried at 290 ° C. by a melt extruder.
The mixture was melt-extruded at a temperature of 100 ° C., and cooled and solidified on a cooling roll having a surface temperature set to 40 ° C. by using an electrostatic contact method to obtain an unstretched sheet. The obtained sheet was stretched 3.5 times in the longitudinal direction at 85 ° C. Next, the film was guided to a tenter and 100
After stretching 3.7 times in the transverse direction at a temperature of 230 ° C., heat fixing was performed at 230 ° C. to obtain a film having a thickness of 38 μm.

Production Example 12 (Polyester film B2) Except for using the polyester O produced in Production Example 5,
A film having a thickness of 38 μm was obtained in the same manner as in Production Example 9. Production Example 13 (Polyester film B3) Except for using polyester K produced in Production Example 1,
A film having a thickness of 38 μm was obtained in the same manner as in Production Example 9. Production Example 14 (Polyester film B4) Except for using polyester P produced in Production Example 6,
A film having a thickness of 38 μm was obtained in the same manner as in Production Example 9. Production Example 15 (Polyester film A1) Except for using polyester K produced in Production Example 1,
A film having a thickness of 300 μm was obtained in the same manner as in Production Example 9.

Example 1 A polyurethane resin-based adhesive (Takelac A-310 / Takenate A- manufactured by Takeda Pharmaceutical Co., Ltd.) was applied to the polyester film B1.
3 = 12/1 by weight) with a gravure roll so as to have a thickness of 3 μm, and pressurizing between the roll heated to 80 ° C. together with the polyvinyl butyral resin laminated microbubble-containing polyester film CV1. This was passed to obtain a composite film having the structure of CV1 / B1. At this time, lamination was performed so that the polyvinyl butyral resin was on the outer surface of the composite film. Next, polyester film A
The composite film having the structure of CV1 / B1 is sequentially composited on both surfaces of the film 1 in the same manner, and the layer structure is CV1 / B1 / A1 / B.
A 1 / CV1 composite sheet was obtained.

Example 2 A composite sheet having a layer structure of / CV1 / B2 / A1 / B2 / CV1 was obtained in the same manner as in Example 1 except that the polyester film B1 in Example 1 was changed to the polyester film B2. . Example 3 Polyvinyl butyral resin-laminated microbubble-containing polyester film CV2 in Example 1 was replaced with polyvinyl butyral resin-laminated microbubble-containing polyester film CV2.
In the same manner as in Example 1 except that
A composite sheet of 2 / B1 / A1 / B1 / CV2 was obtained.

Example 4 The polyester film B1 in Example 1 was replaced with the polyester film B2, and the polyester film CV1 laminated with polyvinyl butyral resin was replaced by the polyester film C laminated with polyvinyl butyral resin.
A composite sheet having a layer configuration of CV2 / B2 / A1 / B2 / CV2 was obtained in the same manner as in Example 1 except that the composition was changed to V2. Comparative Example 1 The layer configuration was C1 / B1 / A1 / in the same manner as in Example 1, except that the polyvinyl butyral resin-laminated fine bubble-containing polyester film (CV1) in Example 1 was changed to the fine bubble-containing polyester film (C1). B1 / C
Thus, a composite sheet No. 1 was obtained.

Comparative Example 2 A composite sheet having a layer structure of CV1 / B4 / A1 / B4 / CV1 was obtained in the same manner as in Example 1 except that the polyester film B1 in Example 1 was changed to the polyester film B4. Comparative Example 3 In the same manner as in Example 1 except that the polyester film B1 in Example 1 was changed to the polyester film B2 and the polyvinyl butyral resin laminated fine bubble-containing polyester film CV1 was changed to the polyester film B2.
A composite sheet having a layer configuration of B2 / B2 / A1 / B2 / B2 was obtained.

Comparative Example 4 The procedure of Example 1 was repeated, except that the polyester film B1 in Example 1 was changed to a polyester film B3 and the polyvinyl butyral resin laminated fine bubble-containing polyester film CV1 was changed to a polyester film B3.
A composite sheet having a layer configuration of B3 / B3 / A1 / B3 / B3 was obtained. The results obtained above are shown in Table 1 below.

[0050]

[Table 1]

[0051]

The card substrate of the present invention has a sufficient concealing property,
It has cushioning properties, print clarity, and print adhesion, and is extremely useful when used as a base material for various cards.

Claims (5)

[Claims] 1. A polyester film (A), a polyester film (B) containing 0.5 to 25% by weight of particles, a fine-bubble-containing polyester film (C) and a resin (D) having A / B / C / D. A card base material comprising a structure laminated in order. 2. The card substrate according to claim 1, wherein the particles contained in the polyester film (B) are white particles. 3. The microbubble-containing polyester film (C) contains 5-45% by weight of a thermoplastic resin substantially incompatible with polyester and has a density of 0.4%.
Card substrate according to claim 1, characterized in that the ~1.3g / cm ^3. 4. The card substrate according to claim 3, wherein the thermoplastic resin substantially incompatible with the polyester is polypropylene. 5. The card base according to claim 1, wherein the resin (D) contains a polyvinyl butyral resin as a main component.