JPS61214225A - Magnetic tape for transfer - Google Patents

Abstract

PURPOSE:To improve the wear resistance of a magnetic stripe formed by transfer and the releasability of the magnetic stripe at the transfer time by allowing a surface protective layer provided on the lower layer side of a magnetic tape for transfer to contain a cellulose acetate. CONSTITUTION:The surface protective layer of the magnetic tape for transfer where the surface protective layer, a magnetic layer, and an adhesive layer are provided at least in order from the lower layer side on a supporting body contains a cellulose acetate. Since the magnetic tape for transfer has the surface protective layer containing the cellulose acetate, the surface hardness of the surface protective layer of the magnetic stripe on a magnetic card or the like formed by transfer is high and the magnetic stripe has a high wear resistance. Therefore, the magnetic stripe can be made thin to ensure magnetic reading. Further, the releasability for formation by transfer is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a magnetic transfer tape used for manufacturing magnetic cards such as cash cards and credit cards.

[Conventional technology]

In general, magnetic transfer tape has at least three layers, a surface protective layer, a magnetic layer, and an adhesive layer, provided in order from the bottom on a support such as a polyethylene film. Ae for colored layer and matte between
A vapor deposited layer may be provided.

This type of magnetic tape for transfer is attached to a transfer target such as a card base with the adhesive layer side as the contact surface, and is pressed under heat via a stamp plate, etc., and then the support is peeled off and the desired By heating and pressurizing the entire pressure bonding surface in accordance with the above, a magnetic stripe is formed on the transfer target to produce a magnetic card or the like.

When the magnetic card obtained in this way is used, it is passed through a magnetic card reader, etc.
Since the surface of the magnetic stripe comes into sliding contact with the magnetic head at a high relative speed, it is necessary to provide sufficient wear resistance with the surface protective layer that constitutes the surface layer of the magnetic stripe. Further, in the transfer, the surface protective layer is required to have good releasability in order to facilitate peeling off the support.

The thickness of such a surface protective layer is desirably formed as thin as possible in order to ensure magnetic reading, and the thickness of the surface protective layer is usually about 2 μm.

For this reason, conventionally, organic polymers that can form a hard film have generally been used for the surface protective layer. For example, when the organic polymer is ζζvinyl chloride-acid vinyl rubinyl alcohol copolymer, Not only was the abrasion resistance inferior, but also the mold releasability was insufficient. In addition, nitrocellulose is a material that relatively meets the above-mentioned required characteristics (documents unknown), but as mentioned above, the thickness of the surface protective layer formed is thin, so it is not satisfactory in terms of wear resistance. I couldn't say it.

[Problem that the invention seeks to solve]

This invention solves the problem that the abrasion resistance of magnetic stripes transferred and formed by conventional transfer magnetic tapes is insufficient. The purpose is to provide magnetic tapes for

[Means for Solving the Problems] As a result of intensive studies for the above purpose, the inventors found that when the surface protective layer contains a specific compound, the surface protective layer has good mold releasability during transfer and This invention was developed based on the knowledge that the surface hardness of the material increases, thereby greatly improving the wear resistance.

That is, the present invention provides a magnetic transfer tape comprising at least three layers, a surface protective layer, a magnetic layer, and an adhesive layer, provided in order from the bottom on a support, wherein the surface protective layer contains cellulose acetate. The present invention relates to a characteristic magnetic tape for transfer.

[Structure and operation of the invention]

The cellulose acetate contained in the surface protective layer of the magnetic tape for transfer in this invention greatly improves the abrasion resistance of the magnetic stripe formed by transfer, and since it is a cellulose derivative similar to conventional general-purpose nitrocellulose, it It exhibits good mold releasability.

The reason why cellulose acetate used in this invention exhibits better abrasion resistance than nitrocellulose is not necessarily clear at present.

It is speculated that in nitrocellulose, 3 of the glucose residues
Each hydroxyl group is substituted with an average of 0 to 3 nitro groups, whereas in cellulose acetate, the same residues as above are substituted with acetyl groups, and this difference forms a surface protective layer. It is thought that the surface hardness of

The properties of cellulose acetate vary greatly depending on the degree of acetylation (degree of substitution of acetyl groups) and degree of polymerization, but the degree of acetylation of cellulose acetate used in this invention is 43 to 62%. , and the average degree of polymerization is 100
A cellulose acetate of about 400 to 400 is preferable, and by using such cellulose acetate, excellent abrasion resistance can be imparted to the surface protective layer.

The entire layer of such a surface protective layer containing cellulose acetate may be composed of cellulose acetate, but usually, in order to further increase the surface hardness of the surface protective layer, it is not necessary to react with the unsubstituted hydroxyl groups. It is preferable to include a crosslinking agent such as an isocyanate compound.

In addition to cellulose acetate, the surface protective layer also includes nitrocellulose, vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate-vinyl alcohol copolymer, urethane resin, fluorine resin, acrylic resin, epoxy resin, Organic polymers such as polybutyral resins may also be included. When such an organic polymer is included, it is preferably used in an amount of 50% by weight or less based on the total amount with cellulose acetate.

Furthermore, various lubricant components such as silicone oil, fluorine oil, higher fatty acids, paraffin, and fatty acid esters may be blended into the surface protective layer as required.

The thickness of such a surface protective layer is usually 2.0 to 3.
．． Although the surface hardness of the surface protective layer is thick (improved), it is possible to obtain good wear resistance even with a thickness of about 1.0 μm. By forming a thin layer, magnetic reading can be ensured, and since the surface roughness of the surface protective layer provided on the support is reduced accordingly, the magnetic layer provided on this layer can be made smoother. The advantage is that it can be provided.

The magnetic tape for transfer of the present invention has the same structure as conventional magnetic tapes of this type except that the surface protective layer is as described above, and the surface protective layer, Various configurations can be made, such as one with three layers, a magnetic layer and an adhesive layer, or one with a colored layer and/or a matting AN evaporated layer interposed between the surface protection layer and the magnetic layer. The formation of each of these layers, with the exception of the matting Al vapor deposited layer, can be carried out in the form of a paint containing the necessary components by sequentially applying and drying the same as in the case of conventional transfer magnetic tapes of this type according to a conventional method.

The thickness of each layer provided following the surface protective layer is 11.0 to 13.0 μm for the magnetic layer and 1 μm for the adhesive layer.
．． The thickness is preferably about 0 to 2.0 μm, and the coloring layer provided as necessary is 3.0 to 5.0 μm.
For the 1 vapor deposition layer, the number is about 500 to 700 people.

Similar to conventional magnetic tapes, these transfer magnetic tapes are used to transfer magnetic stripes on various magnetic cards and bankbooks used as cash cards, credit cards, membership cards, commuter passes, etc. It is something that The transfer method is the same as the conventional one, and the adhesive layer side is temporarily attached to the substrate of the magnetic card as the contact surface, and then heated for 1 to 2 seconds at 90 to 130℃ and about 10 to 30 kg/all using a stamping board etc. After crimping, the support is peeled off and, if necessary, an aluminum or stainless steel press plate is sandwiched between each card to remove distortion during the heat crimping process. /c
j. Heat and press for about 1 to 2 hours.

〔Effect of the invention〕

Since the magnetic tape for transfer according to the present invention is equipped with a surface protective layer containing cellulose acetate, the magnetic stripe of a magnetic card or the like that is transferred and formed by this tape has a high surface hardness of the surface protective layer, and has an extremely high surface hardness. It has wear resistance. Furthermore, it is possible to form a thin wall with a high surface hardness, which makes magnetic reading more reliable. Furthermore, during transfer formation, the surface protection layer's good releasability makes it easy to peel off the support of the magnetic tape for transfer, thereby avoiding residual adhesion of the magnetic stripe component to the support or tearing of the support. be done.

〔Example〕

This invention will be specifically illustrated in Examples below. In addition, all parts below mean parts by weight.

Example 1 A trifunctional isocyanate compound, 4 parts silicone oil, and 4 parts cyclohexanone were placed on a support made of a polyethylene film with a thickness of 23 μm.
41 parts methyl ethyl ketone
A liquid agent consisting of 41 parts was applied and dried to form a 2 μm thick surface protective layer, and on top of this, γ-Fe2O was applied using a vinyl chloride-vinyl acetate-vinyl alcohol copolymer, a polyurethane resin, and an isocyanate compound as binder components.
A magnetic paint containing dispersed magnetic powder consisting of 3 is applied and dried to form a magnetic layer with a thickness of 11 μm, and then a vinyl chloride-vinyl acetate adhesive is applied on top of this to form an adhesive layer with a thickness of 2 μm. A magnetic tape for transfer was produced.

Example 2 1.5 was prepared in the same manner as in Example 1, except that the amount of cellulose acetate used in Example 1 was changed from 10 parts to 20 parts.
A surface protective layer having a thickness of μm was formed, and a magnetic tape for transfer was produced in the same manner as in Example 1.

Example 3 Except that the amount of cellulose acetate used in Example 1 was changed from 10 parts to 7 parts, and 3 parts of nitrocellulose (trade name L-20, manufactured by Daicel Corporation, average degree of polymerization 140) was newly added. A 2 μm thick surface protective layer was formed in the same manner as in Example 1, and a magnetic tape for transfer was obtained in the same manner as in Example 1.

Comparative Example 1 A 2 μm thick surface protective layer was formed in the same manner as in Example 1, except that the same amount of nitrocellulose (same as that used in Example 3) was used instead of 10 parts of cellulose acetate in Example 1. A magnetic tape for transfer was produced in the same manner as in Example 1.

Comparative Example 2 A 2 μm thick surface protective layer was formed in the same manner as in Example 1, except that the same amount of vinyl chloride-vinyl acetate-vinyl alcohol copolymer was used instead of 10 parts of cellulose acetate in Example 1. A magnetic tape for transfer was produced in the same manner as in Example 1.

Example 4 A 1 μm thick surface protective layer was formed in the same manner as in Example 1, except that the amount of cellulose acetate used in Example 1 was changed from 10 parts to 5 parts, and transfer was carried out in the same manner as in Example 1. A magnetic tape was made for the purpose.

Comparative Example 3 A 1 μm thick surface protective layer was prepared in the same manner as in Example 1, except that 5 parts of nitrocellulose (same as used in Example 3) was used instead of 10 parts of cellulose acetate in Example 1. A magnetic tape for transfer was produced in the same manner as in Example 1.

The transfer magnetic tape (tape width 6.5 m1) obtained in the above Examples and Comparative Examples was temporarily adhered onto a 0.7 m thick hard vinyl chloride substrate with the adhesive layer side as the contact surface. ,
After heat-pressing at 120° C. and 30 kg/− for 2 seconds using a stamping plate, the support was peeled off.

Next, nine of these substrates and ten aluminum press plates were alternately stacked, heated and pressurized at 140° C. and 40 kg/cA for 2 hours, and after cooling, cut into predetermined dimensions to produce a magnetic card. A wear resistance test was conducted by repeatedly passing each of these magnetic cards through Card League (manufactured by Juishi Electric Co., Ltd.) at a running speed of 19c111/min. The results are shown in the table below along with the mold releasability during transfer.

As is clear from the table above, the magnetic stripes transferred and formed using the magnetic transfer tapes of the present invention (Examples 1 to 3), in which the surface protective layer contains cellulose acetate and has a thickness of 2 μm or less, have extremely high abrasion resistance. In addition to having good properties, it also has good mold releasability during formation. Moreover, the thickness of the surface protective layer is 1
Even when it is as thin as μm (Example 4), it has the same abrasion resistance as the transfer magnetic tape (Comparative Example 1) having a 2 μm thick surface protective layer containing nitrocellulose.

In contrast, the thickness of nitrocellulose is 1 μm.
The magnetic transfer tape (Comparative Example 3) equipped with a surface protective layer of (Comparative Example 3) had insufficient abrasion resistance due to the thin wall formation. It can be seen that when the magnetic transfer tape (Comparative Example 2) was used, both the abrasion resistance and the mold releasability were poor.

Claims (1)

[Claims] (1) A magnetic tape for transfer comprising at least three layers, a surface protective layer, a magnetic layer, and an adhesive layer, provided in order from the bottom on a support, characterized in that the surface protective layer contains cellulose acetate. Magnetic tape for transcription.