JPH05162489A - Film for protecting card - Google Patents

Abstract

PURPOSE:To provide a film for a card having excellent adhesiveness, particularly excellent adhesiveness to photographic printing paper, in order to prevent the falsification of descriptions of ID card such as drivers license, identification card, etc., or the substitution of photographs. CONSTITUTION:A film for protecting a card is formed from a mixture of one or more resins out of synthetic resin, thermoplastic saturated polyester resin, methylmethacrylate resin, ethyl butyl acrylate resin, vinyl acetate/acrylate copolymer resin, which have sufficient adhesive force under low temperature required for protecting photographic printing paper from heat in thermocompression bonding of a protection film for cards.

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a card protective film, and particularly in ID cards formed by laminating a transparent plastic protective film on one or both sides of a mount, it has a strong adhesive force with the mount and is not easily peeled off. The present invention relates to a card protection film.

[Prior Art]

In recent years, cards having a transparent plastic protective film attached to one or both sides of a mount for the purpose of protecting the mount have been widely used. Especially as an ID card with a photo attached as well as necessary items on the mount,
It is commonly used for driver's licenses and other identification documents. These cards are prepared by writing a necessary matter on a mount or attaching a photograph, and immediately after that, a transparent plastic protective film is thermocompressed on one or both sides of the mount through hot rolls. A polyester film is mainly used as a protective layer, and a protective film coated with polyethylene, an ionomer resin or an ethylene / ethyl acrylate copolymer resin as an adhesive resin is widely used. ..

[Problems to be Solved by the Invention]

[0003] These conventional protective films have a drawback that they are easily peeled off because they have a weak adhesive force with a backing paper particularly in thermocompression bonding at a low temperature of 110 ° C or lower, which is necessary for protecting a photograph from heat during thermocompression bonding. Therefore, it was not possible to sufficiently meet the demands for preventing falsification of the described items or preventing the replacement of the attached photos for the purpose of protecting the ID card.

The present inventor has studied various adhesive resins in order to remedy these drawbacks, and as a result, found a resin having an excellent adhesive strength which has not been obtained in the past, and particularly satisfactory adhesive strength with photographic printing paper. The present invention was completed in order to improve the above-mentioned drawbacks of the prior art, and the main points are as follows.

[Means for Solving the Problems]

The present invention provides a card protective film comprising a synthetic resin film, wherein the synthetic resin is one or more of thermoplastic saturated polyester resin, methyl methacrylate resin, ethyl butyl acrylate resin and vinyl acetate / acrylate copolymer resin. It is a film for protecting a card, which is a mixture of The card-protecting film according to the present invention can be subjected to a heat-adhesion-imparting treatment by a known means on the surface thereof, thereby providing an excellent card-protecting film with improved low-temperature adhesion. Is.

As the synthetic resin in the present invention, commercially available products can be used. Some of these resins are amorphous and some of them are crystalline, but regardless of their melting point or softening point, they have sufficient adhesive strength even at the low temperature required for thermocompression bonding to photographic printing paper. The adhesive strength is further improved as the temperature rises.

[Action]

Conventionally widely used films such as polyethylene, ethylene / ethyl acrylate resin ionomer resin, ethylene / vinyl acetate copolymer resin or a mixture thereof are preferred at 110 ° C. for thermocompression bonding on photographic printing paper. At the low temperatures below, the adhesion to the backing paper is not enough, especially when the thermocompression temperature is raised to increase the adhesive strength, the surface of the photographic paper is about 130 ° C before reaching a satisfactory adhesive strength. Foamed. The synthetic resin of the present invention has a melting point, softening point or pour point of 110 ° C.
Even if the temperature exceeds 110 ° C, the adhesion to the mount or photograph at 110 ° C was satisfactory. Further, the adhesive strength was improved as the temperature was raised, and a stronger adhesive strength was obtained at 130 ° C or lower. It is crystalline and has a melting point of 1.
When the amorphous resin having a low pour point is mixed with the resin having a temperature exceeding 30 ° C, not only the adhesive force at 110 ° C but also a stable and strong adhesive force from 110 ° C or lower to a high temperature can be obtained. It turned out to be.

The film in the present invention is not limited to the resin alone film, and a support film such as polyester may be coated with or laminated with the resin with or without an intermediate layer. A desired film can be formed by. Furthermore, in addition to corona discharge, the surface of the obtained film can be subjected to heat adhesion imparting treatment by a known means such as plasma treatment or coating with a chemical agent comprising an organic metal salt such as alkyl titanate. Hereinafter, the present invention will be described in detail with reference to examples, but these are examples and do not limit the present invention.

【Example】

The resins used in the examples are shown in Tables 1-3.

[Table 1]

[Table 2]

[Table 3]

Example 1 Resin No. 1 is a commercially available polyester film (thickness 5
0 μ) and dried to a thickness of 20 μ. The obtained film was placed on a photographic printing paper (poly color film 699, manufactured by Polaroid) using a Fuji Lami packer and 1
When thermocompression bonding was performed at 10 ° C. and a peeling test was performed after 3 hours, the photographic paper was torn and it was shown that the adhesive strength of the film was satisfactory.

Example 2 Resin No. Commercially available polyester films (thickness 50, 3, 4 and 7 were used using a 45 mm test extrusion laminator).
μ) to a film thickness of 50 μm.
30, 40 and 70. These films were treated in the same manner as in Example 1 with photographic printing paper (polycolor film 6).
The 99) surface was subjected to thermocompression bonding and the same peeling test was performed for each. The results of peeling are shown in Table 4 together with the comparative example (Film No. 70) showing the ratio of the damaged area on the surface of the printing paper.

[Table 4]

Example 3 Resin No. 5 is a commercially available polyester film (thickness 50
μ) using a hot melt applicator, thickness 40
μ coated. Similar to Example 1, this film was thermocompression-bonded to Fuji Photorama as a photographic printing paper, and the same peeling test was performed. It was The rate of breakage on the printing paper surface was 65%.

Example 4 Resin No. The film No. 6 (thickness 50 μm) was sandwiched between the same polyester film as in Example 1 and photographic printing paper, and thermocompression bonded at 110 ° C. using a Fuji Lami Packer. When this was subjected to the same peeling test, the breakage rate of the printing paper surface was 50%.

Example 5 No. No. 2 resin and 100 parts. 100 parts of the resin of No. 5 was mixed and pelletized using an extruder, and this was extrusion-coated in the same manner as in Example 1 to a commercially available polyester film having a thickness of 50 μ to a thickness of 30 μ. This film was subjected to the same thermocompression bonding and peel test except the thermocompression bonding temperature. Table 5 shows the thermocompression bonding temperature and the damage rate of the printing paper surface.

[Table 5]

【The invention's effect】

As the above test shows, it is clear that the films according to the present invention all exhibit excellent adhesive strength, and the film at about 110 ° C. required for protection from heat during thermocompression bonding of photographic paper. Sufficient adhesive strength was obtained at the following temperatures, and all of the photographic printing papers which had a weak adhesive strength and were easily peeled off in the past showed that the mount was damaged. As described above, the present invention can provide a card protective film having excellent adhesive strength.

Claims (1)

[Claims] 1. A card protective film comprising a synthetic resin film, wherein the synthetic resin is one or more of a thermoplastic saturated polyester resin, a methyl methacrylate resin, an ethyl butyl acrylate resin, and a vinyl acetate / acrylate copolymer resin. A film for protecting a card, which is a mixture of