JP2000226526A - Thermoplastic resin composition for sheet or card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a thermoplastic resin composition imparted with antistaticity and having improved embossing workability by including a thermoplastic resin, a specific inorganic plate filler and an antistatic agent. SOLUTION: The objective composition contains (A) 100 pts.wt. of a thermoplastic resin having a glass transition temperature of preferably 70-170 deg.C (e.g. polystyrene, styrene/acrylonitrile copolymer, styrene/butadiene/acrylonitrile copolymer, polyester and polycarbonate), (B) 0.5-25 pts.wt. of an inorganic plate filler having an average particle diameter of 0.5-20 μm (e.g. talc or kaolin) and (C) 0.02-10 pts.wt. of an antistatic agent (e.g. sodium n-hexylsulfonate, sodium n-nonylsulfonate and sodium n-octadecylsulfonate).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet used for a card such as a magnetic card and an IC card having excellent embossing and antistatic properties and / or a thermoplastic resin composition for the card.

[0002]

2. Description of the Related Art In recent years, cards such as magnetic stripe cards and IC cards in which symbols and characters are three-dimensionally engraved by embossing have been widely used. As these card materials, it is necessary that the card is not warped or cracked by embossing, and a multilayer sheet made of a hard polyvinyl chloride resin is generally used. However, even in the case of polyvinyl chloride resin, warpage cannot be completely eliminated by embossing, and further reduction in warpage is required. Also, due to growing awareness of environmental issues,
There has been a demand for a card material having excellent embossability other than polyvinyl chloride resin.

As a card material other than polyvinyl chloride resin, 1,4-cyclohexanedimethanol derivative copolymerized polyester is known.

JP-A-53-94536 discloses a blend of polycarbonate and poly (1,4-cyclohexanedimethanol terephthalate-co-isophthalate). Also, JP-A-59-12
No. 0648 discloses a blend of a polycarbonate and a 1,4-cyclohexanedimethanol derivative copolymerized polyester. However, even if these are simply applied to a card material, the warpage due to embossing cannot be sufficiently reduced, and the antistatic property is not sufficient.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a sheet or sheet which is used for cards such as magnetic cards and IC cards and which has excellent embossing properties and further prevents dust from adhering and troubles during handling due to static electricity. An object of the present invention is to provide a thermoplastic resin composition for a card.

[0006]

Means for Solving the Problems The present inventors have intensively studied to provide a sheet or a thermoplastic resin composition for a card used for a card such as a magnetic card or an IC card which is excellent in embossability. As a result, the embossability is dramatically improved by adding an inorganic plate-like filler having a specific particle size, particularly talc, to the thermoplastic resin. It was found that the processability was improved, and the present invention was completed.

That is, the present invention provides (1) (A) 100 parts by weight of a thermoplastic resin, and (B) an average particle size of 0.5 to 20 μm.
0.5 to 25 parts by weight of an inorganic plate-like filler and (C)
(2) The thermoplastic resin composition for a sheet or card according to the above (1), wherein the component (B) is talc, which contains 0.02 to 10 parts by weight of an antistatic agent. The resin composition, (3) the thermoplastic resin composition for a sheet or card according to any one of the above (1) or (2), wherein the component (A) is a thermoplastic resin having a glass transition temperature of 70 to 170 ° C, 4) The thermoplastic resin composition for a sheet or card according to any one of the above (1) to (3), wherein the antistatic agent of the component (C) is a sulfonate-type anionic antistatic agent. An embossed sheet or card comprising the thermoplastic resin composition for a sheet or card according to any one of 1) to (4),
(6) A sheet or card in which the thermoplastic tree composition for sheet or card according to any one of the above (1) to (4) is used as a part of the sheet or card, and (7) the above (1) to (4) (4) A sheet or card in which the thermoplastic resin composition for a sheet or card described above is used on the surface of the sheet or card.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the thermoplastic resin of the component (A) is not particularly limited as long as it is a thermoplastic resin which can be formed and processed by an extruder, and specifically, polystyrene, styrene / acrylonitrile Copolymer, styrene / butadiene / acrylonitrile copolymer, polyester, polycarbonate, polymethyl methacrylate, polyether sulfone, polyarylate, polysulfone, cyclic polyolefin, etc., and these can be used alone or in combination of two or more. . Among them, the glass transition temperature is 70 to 170 ° C, more preferably 70 to 170 ° C.
A temperature of 155 ° C. is preferable in terms of the balance between the heat fusion temperature during card production and the heat resistance of the card material, and is preferably polystyrene, styrene / acrylonitrile copolymer, styrene /
Preferred examples include butadiene / acrylonitrile copolymer, polyester, and polycarbonate.

The total light transmittance measured by ASTM D1003 is 50% or more, preferably 70% for a 2 mm thickness.
%, More preferably 80% or more of the transparent thermoplastic resin. When two or more kinds of thermoplastic resins are used in combination, the total light transmittance of the composition containing the thermoplastic resins is preferably within the above range. The composition using the thermoplastic resin having such a total light transmittance as the component (A) is particularly suitable as a material for a surface layer of a card or a sheet, but is not limited to only the material for the surface layer.

In the present invention, the inorganic plate-like filler of the component (B) is a so-called plate-like inorganic filler, which has a three-dimensionally anisotropic particle shape and biaxial orientation. Agents are preferred. Specific examples include talc, kaolin, mica, sericite, basic magnesium carbonate, aluminum hydroxide, glass flake, and the like. Two or more of these fillers may be used in combination. Of these, talc and kaolin are preferred, and talc is most preferred.

The amount of the inorganic plate-like filler to be added is as follows:
0.5 to 25 parts by weight is preferable with respect to 00 parts by weight,
Especially, 1-20 weight part is more preferable, and 4-15 weight part is more preferable. Within this range, the moldability is good, good sheets and cards are obtained, the effect of improving the embossability is high, and the transparency is also excellent.

The average particle size of the inorganic plate-like filler is preferably 0.5 to 20 μm at the stage after compounding, and especially preferably 0.5 to 1 μm.
0 μm, more preferably 1 to 5 μm can be used.
Within this range, sheet and card formability is good,
The effect of improving the embossability is high, and the transparency is also excellent.

The average particle size of the inorganic platy filler is determined by treating the thermoplastic resin composition of the present invention with an organic solvent or burning it in an electric furnace or the like to separate only the inorganic platy filler component.
It can be determined by measuring with a centrifugal sedimentation type particle size distribution analyzer.

As the antistatic agent of the component (C) of the present invention, it is possible to use a general surfactant type antistatic agent used for thermoplastic resins. Specific examples include nonionic, anionic, cationic, and amphoteric types, and one or more of these antistatic agents can be used. In addition, among the antistatic agents, anionic antistatic agents are preferably used, and examples of the anionic antistatic agent include sulfonate-type anionic antistatic agents, such as alkylsulfonic acid metal salts and alkylaromatic sulfones. There are acid metal salts and the like, and metal alkyl sulfonates are preferably excellent in antistatic properties and embossability. Examples of the alkyl sulfonic acid metal salt include an alkali metal salt or an alkaline earth metal salt of an aliphatic sulfonic acid having 1 to 35 carbon atoms in the alkyl group, and a preferable alkyl group has 8 to 22 carbon atoms. . Examples of the alkali metal include sodium and potassium, and examples of the alkaline earth metal include calcium, barium, and magnesium. Specific examples of the alkylsulfonic acid metal salt include sodium n-hexylsulfonate, sodium n-hexylsulfonate, and n-hexylsulfonic acid.
Sodium octyl sulfonate, sodium n-nonyl sulfonate, sodium n-decyl sulfonate, sodium n-dodecyl sulfonate, sodium n-tetradecyl sulfonate, n-
There are sodium hexadecylsulfonate, sodium n-heptadecylsulfonate, sodium n-octadecylsulfonate and the like. If the amount of the antistatic agent is too small, the effect of imparting sufficient antistatic properties and the effect of improving the embossability are poor, and if the amount is too large, the thermal stability of the thermoplastic resin tends to be impaired. 0.02-1 to 100 parts by weight of the component
0 parts by weight is preferable, and especially 0.03 to 7 parts by weight, more preferably 0.05 to 5 parts by weight.

[0015] The thermoplastic resin composition of the present invention may further contain other various additives within a range not to impair the object of the present invention. Examples of these other additives include reinforcing agents such as glass fiber, carbon fiber, asbestos fiber, rock wool, calcium carbonate, silica sand, bentonite, barium sulfate, and glass beads, or antioxidants (phosphorus, sulfur System), UV absorbers, heat stabilizers (hindered phenols, etc.), lubricants, slip improvers, anti-blocking agents, coloring agents including dyes and pigments, flame retardants (halogens, phosphorus systems, etc.), flame retardants Auxiliaries (antimony compounds represented by antimony trioxide, zirconium oxide, molybdenum oxide, etc.), foaming agents, cross-linking agents (eg, polyvalent epoxy compounds, isocyanate compounds, acid anhydrides, etc.) are exemplified. Further, other synthetic resins (for example, polyamide resin, polystyrene resin, acrylic resin, polyethylene resin, ethylene / vinyl acetate copolymer, phenoxy resin, epoxy resin, silicone resin, etc.) can be contained.

The card according to the present invention has a long side of 10 m.
It is a plate-shaped molded product having a size of m to 300 mm, a short side of 10 to 200 mm, and a thickness of 50 to 5000 μm (the long side and the short side may have the same length, that is, a square), and exceeds this A molded article having a spread is referred to as a sheet, and in the present invention, refers to a material at a stage prior to card production.

The method for producing the thermoplastic resin composition of the present invention can be carried out by a known method. As a specific production method, there is a method of uniformly kneading the components (A) and (B) and, if necessary, the various additives (C) and (D) using a single-screw or twin-screw extruder. No. In addition, at the time of melt-kneading, a masterbatch method in which only specific components are preliminarily kneaded and then kneaded with the remaining components may be used.

The method for producing a sheet comprising the thermoplastic resin composition of the present invention includes a method in which the thermoplastic resin composition is melt-kneaded, then pelletized, and processed into a sheet by commonly known injection molding, or a method in which the thermoplastic resin composition is formed. After melt-kneading, a sheet is formed by a known method such as a T-die method or an inflation method.

The sheet made of the thermoplastic resin composition of the present invention may be either a single layer or a laminate of two or more sheets. There are no particular limitations on the lamination method when two or more sheets are used, and any known method such as a coextrusion method or a heat lamination method is used. In that case, at least one of the layers only needs to be formed of the thermoplastic resin composition of the present invention, and in particular, it is preferable that the thermoplastic resin composition of the present invention be formed on the surface layer. Is preferred.

The thickness of the sheet is 50 in the case of a single layer.
Thicknesses of up to 5000 μm, preferably 100 to 1000 μm are preferably used. When two or more sheets are stacked, the thickness is appropriately determined depending on the number of sheets to be stacked, the total thickness, decoration reasons, and the like.
m to 5000 μm, preferably 300 μm to 10 in total
A thickness of 00 μm is preferably used. In particular, a sheet having a surface layer (oversheet) of about 50 μm to 100 μm and a layer other than the surface layer (core sheet) of about 100 μm to 700 μm is preferably used.

As a method for producing a card comprising the thermoplastic resin composition of the present invention, the thermoplastic resin composition is melt-kneaded, then pelletized, and then processed into a card by generally known injection molding, or the thermoplastic resin of the present invention. There is a method of cutting a sheet made of the resin composition into a specific size and processing it into a card. Alternatively, a plurality of sheets made of the thermoplastic resin composition of the present invention may be laminated to form a multilayer sheet, and then cut into a specific size and processed into a card. At this time, an adhesive layer or a layer for an antenna circuit or the like may be provided between each layer of the multilayer sheet as needed. Further, each layer may be printed or a magnetic material may be applied. Such a magnetic layer,
The entire sheet or a part of the sheet such as a stripe shape may be used. Further, the sheet may be subjected to secondary processing such as press molding to be processed into a card shape.

As for the size of the card, the long side is 10 mm
It is preferably a rectangular shape having a width of 50 mm to 300 mm and a short side extending from 10 mm to 200 mm, and a thickness of 50 to 5000 μm, particularly a long side of 50 mm to 100 mm and a short side of 2 mm.
A rectangular shape having an extension of 5 mm to 80 mm and a thickness of 400 to 2000 μm is preferable. Above all, a rectangular shape having a long side of about 85 mm and a short side of about 54 mm and a thickness of 600 to 900 μm is more preferable.

The card according to the present invention is generally a card capable of recording information, and in particular, has a function capable of reading information electrically, optically or magnetically, a function capable of recording writable information, and an embossing process. It is suitable for a card having one or more functions such as a function of recording information. Specifically, a contact type IC card (smart card), a non-contact type IC card having an IC chip and an antenna circuit embedded in the card, a magnetic card such as a magnetic stripe card, an optical card, and the like are preferable. Applications include prepaid cards, credit cards, banking cards, various certification cards, and the like.

When the thermoplastic resin composition of the present invention is used for a card conforming to JIS X6301, such as a magnetic card and an IC card, the thermoplastic resin composition 100 of the present invention is usually used.
It is used opaque by adding 2 to 25 parts by weight of titanium oxide to parts by weight.

The thermoplastic resin composition of the present invention is excellent in embossability for engraving characters and patterns, and is therefore suitable for use in cards such as magnetic cards and IC cards.

[0026]

EXAMPLES The effects of the present invention will be further described below with reference to examples. The tensile test was measured according to ASTM D638, and the tensile impact test was measured according to ASTM D1822. The amount of card warpage after embossed character engraving as embossing property is determined by embossing three lines of embossed characters on a card conforming to JIS X6301 using a manual embosser (NE-1600 manufactured by Nipponjiken Co., Ltd.).
01 and the card warpage was measured. The surface specific resistance was measured using a super insulation resistance meter SM-10 manufactured by Toa Denpa Kogyo.

The following thermoplastic resins were used as the component (A).

A-1: Aromatic polycarbonate resin
Iupilon "S3000" Total light transmittance of 95% for a thickness of 2 mm assumed by ASTM D1003 manufactured by Mitsubishi Engineering-Plastics Corporation is a DSC manufactured by PERKIN ELMER.
The glass transition temperature measured at 7 was 154 ° C.

A-2: ABS resin "Toyolac" type 920 The total light transmittance of 2 mm thick assumed by ASTM D1003 manufactured by Toray Industries, Inc. is 90%, and DSC manufactured by PERKIN ELMER is used.
The glass transition temperature measured at 7 was 83 ° C.

A-3: Amorphous polyester resin "Easter" GN071 The total light transmittance of a 2 mm thick film assumed by ASTM D1003 manufactured by Eastman Chemical Company is 90%, and the DSC manufactured by PERKIN ELMER is used.
The glass transition temperature measured at 7 was 73 ° C.

A-4: Polyester resin "Trecon" 1
401X06 The total light transmittance with a thickness of 2 mm assumed by ASTM D1003 manufactured by Toray Industries, Inc. was 40% or less.

As the inorganic plate-like filler of the component (B), talc having an average particle size of 1.4 μm (manufactured by Fuji Talc Kogyo KK)
MS-300) was used. There was no change in the average particle size of talc before and after blending.

As the antistatic agent of the component (C), sodium alkyl sulfonate (sodium dodecylbenzene sulfonate (TME-020, manufactured by Takemoto Yushi Co., Ltd.)) was used.

Examples 1 to 7 and Comparative Examples 1 to 4 Components (A), (B) and (C)
After the components and other additives were dry-blended in a V blender, they were supplied to a single screw extruder and discharged from a T-die to obtain sheets having a thickness of 100 μm and 300 μm.

In Examples 1, 2, 3, and 6, A-1 and the inorganic plate-like filler were preliminarily kneaded in a twin screw extruder at a ratio of A-1 / inorganic plate-like filler = 60/40 wt%. A master batch was used. In Example 4, A-2 and the inorganic plate-like filler were preliminarily kneaded at a ratio of A-2 / inorganic plate-like filler = 60/40 wt% by a twin-screw extruder and used as a master batch. In Example 5, A-
No. 3 and the inorganic plate-like filler were previously subjected to A-3 /
Inorganic plate-like filler = 60/40 wt% was pre-kneaded and used as a master batch.

The above 100 μm and 300 μm sheets are stacked in the order of 100/300/300/100 μm (“/” indicates lamination), and are subjected to a heat press molding machine.
Thermal fusion under the conditions of MPa and holding time of 10 minutes, 120 × 1
Create a sheet of 20 x 0.72-0.78mm thick,
Various test pieces and a card conforming to JIS X6301 were punched out by a punching press. Examples 1, 2, 3, 6,
7. In Comparative Examples 1 and 2, cards were formed under the conditions of a sheeting temperature of 280 ° C. and a heat fusing temperature of 220 ° C. In Example 4, the card was formed under the conditions of a sheeting temperature of 240 ° C. and a heat fusing temperature of 160 ° C. In Example 5, Comparative Examples 3 and 4,
A card was prepared under the conditions of a sheeting temperature of 220 ° C. and a heat fusing temperature of 120 ° C.

Incidentally, there was no change in the average particle size before and after the blending of talc as the inorganic plate-like filler.

[0038]

[Table 1]

Examples 8 to 9 and Comparative Example 5 As Reference Example 1, the thicknesses of 100 μm and 300 μm
100 μm and 300 μm obtained by feeding a polyester resin of A-4 to a single screw extruder set at 260 ° C. and discharging from a T-die using a sheet of m.
100 μm as a surface layer (oversheet) and 300 μm as a core layer (core sheet), respectively, and 100/300/30
The layers were stacked in the order of 0/100 μm (“/” indicates lamination), applied to a press molding machine, and heat-fused under the conditions of a temperature of 220 ° C., a pressure of 1 MPa and a holding time of 10 minutes.
A card conforming to IS X6301 was obtained.

[0040]

[Table 2]

The thermoplastic resin composition for a card of the present invention comprises:
The amount of warpage after embossing is small, the tensile properties are high, and the addition of an antistatic agent reduces the surface resistivity and improves the embossability.

[0042]

When the composition of the present invention is used for cards such as a magnetic card and an IC card, even if embossing is performed, there is little warpage or the like and excellent antistatic properties.

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Claims (7)

[Claims] (A) 100 parts by weight of a thermoplastic resin, (B)
Inorganic platy filler having an average particle size of 0.5 to 20 μm.
5 to 25 parts by weight and (C) antistatic agent 0.02 to 10
A thermoplastic resin composition for sheets or cards containing parts by weight. 2. The thermoplastic resin composition for a sheet or card according to claim 1, wherein the component (B) is talc. (3) the component (A) has a glass transition temperature of 70 to 17;
The thermoplastic resin composition for a sheet or card according to claim 1 or 2, wherein the thermoplastic resin is a thermoplastic resin at 0 ° C. 4. The antistatic agent of component (C) is a sulfonate type anionic antistatic agent.
4. The thermoplastic resin composition for a sheet or card according to any one of items 1 to 3. 5. An embossed sheet or card comprising the thermoplastic resin composition for a sheet or card according to claim 1. 6. A sheet or card wherein the thermoplastic resin composition for a sheet or card according to claim 1 is used for a part of the sheet or card. 7. A sheet or card wherein the thermoplastic resin composition for a sheet or card according to claim 1 is used on the surface of a sheet and / or card.