JP2002144511A - Multilayer sheet and card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multilayer sheet for a card having self-fusion bondability, heat resistance and a stable quality. SOLUTION: The multilayer sheet comprises at least three layers having a fusion bonding layer (A) of a copolymer polyester obtained by substituting 10 to 70 mol% of an ethylene glycol component of a polyethylene terephthalate resin for a cyclohexane dimethanol, a heat resistant layer (B) made of a polycarbonate resin, and a front surface layer (C) containing a lubricant of 0.1 to 3 pts.wt. for 100 pts.wt. of the copolymer polyester obtained by substituting 10 to 70 mol% of the ethylene glycol component of the polyethylene terephthalate resin for the cyclohexane dimethanol, so that the layers (C), (B) and (A) are sequentially laminated in this order from the surface layer side of the card.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a card sheet such as an IC card or a magnetic stripe card which is produced by laminating a core sheet and an oversheet and has an IC chip or the like mounted therein.

[0002]

2. Description of the Related Art Generally, a card material is composed of a white colored central layer called a core sheet and a transparent oversheet laminated on the surface of the core sheet and covered as a pair on the back surface of the card. You. For the fusion of the laminated surfaces of the core sheet and the oversheet, dry lamination via heat fusion or press fusion using a heat fusion adhesive is used.

[0003] In these card sheets, polyvinyl chloride sheets have been generally used, but in recent years, movements to avoid polyvinyl chloride resin due to the problem of incineration have begun to be seen. As an alternative to the polyvinyl chloride resin, polyethylene terephthalate resin, which is an olefin resin, and copolyester resin obtained by substituting the ethylene glycol component of polyethylene terephthalate resin with cyclohexane dimethanol, are rapidly becoming available on the market. I have.

However, polyethylene terephthalate resin has poor heat-sealing properties and requires press-sealing using a heat-sealing adhesive. There is a risk of adverse effects. In addition, the man-hour and cost for applying the heat-sealing adhesive to the oversheet are increased. Further, the copolymerized polyester resin obtained by substituting the ethylene glycol component of the polyethylene terephthalate resin with cyclohexane dimethanol has insufficient heat resistance and has a high temperature (70%).
(° C).

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a multilayer sheet for a card which has a self-fusing property and heat resistance, is stable at low cost, and has a stable quality.

[0006]

Means for Solving the Problems The present inventors have conducted intensive searches to solve the above-mentioned problems, and as a result, have found that the problems can be solved by using a multilayer sheet having a fusion layer, a heat-resistant layer and a surface layer. . That is, the present invention relates to a polyethylene terephthalate resin having 10 to 70 ethylene glycol components.
A fusion layer (A), which is a copolymerized polyester obtained by substituting mol% with cyclohexanedimethanol, a heat-resistant layer (B) composed of a polycarbonate resin, and 10 to 70 mol% of an ethylene glycol component of a polyethylene terephthalate resin in cyclohexane. It consists of at least three layers of a surface layer (C) containing 0.1 to 3 parts by weight of a lubricant with respect to 100 parts by weight of a copolymerized polyester replaced with dimethanol, and in the order of C / B / A from the card surface side. It is a multilayer sheet characterized by being laminated.

Preferably, the thickness ratio of the heat-resistant layer is 5%.
0% to 90%, and the thickness of the heat-resistant layer is 50 μm or more. The present invention also relates to an ethylene glycol component of polyethylene terephthalate resin.
This is a card in which the above-mentioned multilayer sheet is used as an oversheet for a core sheet made of a copolymerized polyester obtained by replacing 0 mol% with cyclohexanedimethanol.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The copolymerized polyester resin used as a fusion layer and a core sheet in the present invention is a polyethylene terephthalate resin obtained by substituting 10 to 70 mol% of an ethylene glycol component with cyclohexanedimethanol. When used, if the substitution amount of the ethylene glycol component is less than 10 mol%, the heat sealability is poor, and the elastic modulus of the sheet after the fusion is lowered. This is because the polyethylene terephthalate resin is a crystalline resin, so that the recrystallization of the sheet proceeds during cooling after fusing, whereby the heat-fusing property is lost and the elastic modulus of the sheet decreases. Conversely, when the substitution amount of the ethylene glycol component exceeds 70 mol%, the elastic modulus of the copolymerized polyester resin decreases, and the heat fusibility decreases. This is because when the substitution amount of the copolymerized polyester resin increases, recrystallization proceeds quickly, and the heat-fusing property is lost.

That is, 10 to 7 of the ethylene glycol component
By substituting 0 mol% with cyclohexanedimethanol, the copolymerized polyester resin becomes a non-crystalline resin, has a heat-sealing property, and does not reduce the elastic modulus of the sheet. Therefore, the replacement amount of the ethylene glycol component with cyclohexanedimethanol is preferably 10 to 70 mol%, and more preferably 20 to 35 mol%.

The polycarbonate resin for the heat-resistant layer used in the present invention can be obtained by a phosgene method of reacting various dihydroxydiaryl compounds with phosgene, or a transesterification method of reacting a dihydroxydiaryl compound with a carbonate such as diphenyl carbonate. It is a polymer.

The dihydroxydiaryl compounds include bisphenol A, bis (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, and 2,2-bis (4-hydroxyphenyl).
Butane, 2,2-bis (4-hydroxyphenyl) octane, bis (4-hydroxyphenyl) phenylmethane, 2,2-bis (4-hydroxyphenyl-3-methylphenyl) propane, 1,1-bis (4 Bis (hydroxyaryl) alkanes such as -hydroxy-3-tert-butylphenyl) propane, 1,1-bis (4-hydroxyphenyl) cyclopentane, 1,1-bis (4
Bis (hydroxyaryl) cycloalkanes such as -hydroxyphenyl) cyclohexane, 4,4'-
Dihydroxydiaryl ethers such as dihydroxydiphenylether, 4,4'-dihydroxy-3,3'-dimethyldiphenylether, 4,4'-dihydroxydiphenylsulfide, and 4,4'-dihydroxy-3,3'-dimethyldiphenylsulfide; Dihydroxydiaryl sulfoxides, such as 4,4'-dihydroxydiphenyl sulfoxide, and 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfoxide, 4,4'-
Examples thereof include dihydroxydiaryl sulfones such as dihydroxydiphenyl sulfone and 4,4′-dihydroxy-3,3′-dimethyldiphenyl sulfone, and these may be used alone or in combination of two or more.

The viscosity average molecular weight of the polycarbonate resin used in the present invention is not particularly limited.
Normally from 10,000 to 100,000 from strength, heat resistance,
Preferably it is 15000-35000. In producing such a polycarbonate resin, a molecular weight regulator, a catalyst and the like may be added as necessary. The thickness of the heat-resistant layer is preferably at least 50 microns. When the thickness is less than 50 microns, the heat resistance is insufficient and the card is bent.

The multilayer sheet of the present invention comprises at least three layers, a fusion layer, a heat-resistant layer and a surface layer. The thickness layer constituting ratio of the heat-resistant layer is preferably in the range of 50% to 90%. If the layer composition ratio of the heat-resistant layer is less than 50%, the heat resistance decreases, and the
If the ratio exceeds the range, the fusing property and the embedding property of the magnetic tape are reduced.

The lubricant used in the present invention is preferably a fatty acid ester lubricant, a fatty acid amide lubricant, silicone oil or the like. Examples of the fatty acid ester lubricant include butyl stearate, cetyl palmylate, monoglyceride stearate, diglyceride stearate, triglyceride stearate, esters of montan wax acid, wax esters, dicarboxylic acid esters, and composite esters. Examples of the fatty acid amide-based lubricant include stearic acid amide, ethylenebisstearyl amide and the like.

Examples of the silicone oil include straight silicone oils such as dimethyl silicone oil, methyl phenyl silicone oil, and methyl hydrogen silicone oil, polyether-modified silicone oil, alkyl-modified silicone oil, higher fatty acid ester-modified silicone oil, and methylstyryl-modified silicone oil. Examples include non-reactive modified silicone oils such as silicone oils. The above fatty acid ester-based lubricant, fatty acid amide-based lubricant, silicone oil and the like may be used alone or in combination. The amount of the lubricant added is 0.1 to 3 parts by weight, preferably 1 to 2 parts by weight. If the amount is less than 0.1 part by weight, it is fused to the press plate at the time of pressing, and if it exceeds 3 parts by weight, plate-out occurs.

The multilayer sheet of the present invention may contain, if desired, commonly used additives such as stabilizers, lubricants, reinforcing agents, processing aids, pigments, antistatic agents, antioxidants, neutralizing agents, ultraviolet rays. Absorbents, dispersants, thickeners, other inorganic fillers, etc., or other synthetic resins can also be included.

For processing the multilayer sheet of the present invention into a sheet shape, there are conventionally known methods such as a calendering method, an extrusion method, a pressing method, and a casting method, but are not particularly limited here.

[0018]

EXAMPLES The present invention will be described below by way of examples, which are merely examples, and the present invention is not limited to these examples.

<< Preparation of Oversheet >> A multilayer sheet was prepared by extruding the fusion layer A, the heat-resistant layer B, and the surface layer C shown in Table 1 in the composition ratio shown in Table 2.

<< Preparation of Core Sheet >> A 500 μm sheet was prepared by extruding a copolyester resin obtained by substituting 30 mol% of an ethylene glycol component of polyethylene terephthalate resin with cyclohexanedimethanol.

<< Examples and Comparative Examples >> Using the prepared oversheets and core sheets, tests for confirming the fusing properties, heat resistance properties, embedding properties, and plate-out were performed. Table 3 shows the results. Various evaluations were performed based on the following. (1) Fusing property: A 150 ° C. overcoat sheet prepared at a ratio shown in Table 2 with a core sheet of a copolymerized polyester resin obtained by substituting 30 mol% of an ethylene glycol component of a polyethylene terephthalate resin with cyclohexanedimethanol.
After pressing for 10 minutes, a cut was made and it was confirmed whether or not the two sheets were peeled off. ：: Sheet completely fused △: Sheet partially peeled but usable level ×: Sheet completely peeled, stuck to press plate (2) Heat resistance test: The sheet was placed on an oven at 70 ° C. and it was checked whether the sheet was bent. ：: Undeflected Δ: Slightly deflected but usable level ×: Completely deflected (3) Embedding property: A polyethylene terephthalate resin obtained by replacing 30 mol% of the ethylene glycol component with cyclohexane dimethanol. 15 sheets of the oversheet prepared at the ratio of Table 4 with the core sheet of the copolymerized polyester resin
After pressing at 0 ° C. for 10 minutes, a 10 μm-thick stretched PET is placed on the surface layer of the oversheet,
Pressed for a minute to check if it was embedded. ：: Stretched PET completely embedded △: Stretched PET partially embedded ×: Stretched tape not embedded (4) Confirmation of plate-out: Over-sheet extrusion by multilayer extrusion After the production, it was confirmed whether the lubricant or the like had been transferred to a cooling roll or the like. ○: No plate-out confirmed ×: Plate-out confirmed

The symbols in the table are as follows. (1) PETG resin-1: A copolymerized polyester resin obtained by substituting 30 mol% of an ethylene glycol component in a polyethylene terephthalate resin with cyclohexanedimethanol. (Tg = 69 ° C.) (2) PETG resin-2: A copolymerized polyester resin in which 5 mol% of an ethylene glycol component in a polyethylene terephthalate resin is substituted with cyclohexanedimethanol. (Tg = 85 ° C.) (3) PETG resin-3: A copolymerized polyester resin in which 80 mol% of an ethylene glycol component in a polyethylene terephthalate resin is substituted with cyclohexanedimethanol. (Tg = 88 ° C.) (4) PC resin-1: polycarbonate resin (Tg = 1
(20 ° C) (5) Lubricant: montanic acid ester

[0023]

[Table 1]

[0024]

[Table 2]

[0025]

[Table 3]

[0026]

According to the polyester resin sheet of the present invention, it is possible to obtain a low-cost, stable card of high quality without using an adhesive or an adhesive layer.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G06K 19/077 G06K 19/00 K F term (Reference) 2C005 HA10 HA19 HA21 JA02 JA26 KA02 KA03 LA03 MA11 MA18 PA03 PA04 RA04 4F100 AK42A AK42C AK45B AL01A AL01C BA03 BA06 BA10A BA10C BA16 BA25 CA19C GB41 GB90 JJ03B JL11 YY00A YY00B YY00C 5B035 AA07 BA05 BB02 BB09 BC00

Claims (4)

[Claims] 1. A fusion layer (A), which is a copolymerized polyester obtained by substituting 10 to 70 mol% of an ethylene glycol component of a polyethylene terephthalate resin with cyclohexanedimethanol, and a heat-resistant layer (B) made of a polycarbonate resin. , A copolymer polyester 100 obtained by substituting 10 to 70 mol% of an ethylene glycol component of a polyethylene terephthalate resin with cyclohexanedimethanol.
A surface layer (C) containing 0.1 to 3 parts by weight of a lubricant with respect to parts by weight,
A multilayer sheet characterized by being laminated in the order of / B / A. 2. The thickness ratio of the heat-resistant layer (B) is 50%.
The multilayer sheet according to claim 1, wherein the content of the multilayer sheet is from 90% to 90%. 3. The multilayer sheet according to claim 1, wherein the heat-resistant layer (B) has a thickness of 50 μm or more. 4. The multilayer sheet according to claim 1, wherein a core sheet comprising a copolymerized polyester obtained by substituting 10 to 70 mol% of an ethylene glycol component of a polyethylene terephthalate resin with cyclohexanedimethanol is used. Card used as overseat.