JPH0762319A - Adhesive for pouch - Google Patents

Abstract

PURPOSE:To obtain an adhesive used for the production of a pouch containing in one part thereof information recorded by using a video printer. CONSTITUTION:A hot-melt adhesive used in producing a pouch by joining a transparent plastic film to a color print outputted from a video printer forming an image through thermal transfer of a subliming dye, which is composed mainly of a saturated polyester resin and a polyurethane resin. The use of this adhesive can produce a pouch having a transparent plastic film and a color print outputted from a video printer firmly bonded to each other. It can also provide a pouch (ID card) effective for the prevention of a forgery and suffering no deterioration even in long-term service.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to the production of pouches (card-shaped articles on which cards such as photographs and information such as name, affiliation, identification, etc. are adhered or covered with a transparent plastic film). The present invention relates to an adhesive used in. In particular, the present invention relates to an adhesive used when manufacturing a pouch that partially contains recorded information manufactured using a video printer.

[0002]

2. Description of the Related Art In recent years, with the practical use of color video printers, it has become very easy to obtain high-quality color prints. As a result, personalized postcards and stickers have been made using color video printers, and color video printers have also been used to make pouches. That is, information about a person is stored in advance in a computer, and a color video printer connected to the computer as an output device is used to output the required person information as a color print. Then, on the front surface of the obtained color print, if necessary, on the front surface and the back surface,
Pouch (ID
Card) is manufactured.

A color video printer is a device for forming an image by thermally transferring a sublimable dye onto a printing paper. For printing paper, synthetic paper made of paper or polypropylene is used as a base material, and a dye receiving layer that ensures dye acceptability and fixability is applied to the surface to which the dye is transferred. on the other hand,
A back coat layer for controlling the running of the printing paper inside the video printer is coated on the opposite surface of the printing paper. In this way, on both sides of the photographic paper for video printers,
Various materials such as vinyl chloride and vinyl acetate copolymers and polyester resins have been applied.

Conventionally, as an adhesive for covering and adhering a transparent plastic film to a mount, ethylene terephthalate which is a material of the transparent plastic film, ethylene ethyl acrylate which strongly adheres to polycarbonate, ethylene vinyl acetate copolymer, saturated polyester resin, etc. Has been used. However, the above conventional adhesive is
None of them show strong adhesive strength to all kinds of dye receiving layers and back coat layers, and the photographic paper can be easily peeled from the transparent plastic film. for that reason,
It is a problem that the pouch can be forged by using the peeled transparent plastic film.

Further, a pouch obtained by coating and adhering a transparent plastic film on a color print using a conventional adhesive such as ethylene ethyl acrylate or ethylene vinyl acetate copolymer causes migration with the passage of time. As a result, there is a drawback that the written information is blurred and blurred.

[0006]

DISCLOSURE OF THE INVENTION As a result of intensive studies made by the present inventors in order to solve the above-mentioned drawbacks, a heat-adhesive adhesive containing a saturated polyester resin and a polyurethane resin as a main component can be used for various materials of photographic paper. The inventors have found that they strongly adhere to the dye receiving layer and the back coat layer, and have reached the present invention. The adhesive of the present invention also adheres to a transparent plastic film and is chemically stable and does not migrate in a state of being in contact with a thermally transferred sublimable dye.

[0007]

The present invention is used for manufacturing a pouch by bonding a color print output from a video printer for forming an image by thermally transferring a sublimable dye and a transparent plastic film. A heat-adhesive adhesive, which is characterized in that the adhesive contains a saturated polyester resin and a polyurethane resin as main components.

The polyurethane resin can broaden the adhesiveness to the dye receiving layer and the back coat layer of the photographic printing paper for video printers, and has a strong adhesive strength to the dye receiving layer and the back coat layer of the known photographic paper. Indicates. Various known polyurethane resins can be used as the polyurethane resin. As a typical synthesis method, a method in which a high molecular polyol and a diisocyanate compound are reacted, and then various known diamines, chain extenders such as glycols, and further, if necessary, a monoamine, a terminal terminating agent such as monoalcohol are reacted. Can be mentioned. The molecular weight of polyurethane resin is
The range of 10,000 to 150,000 is preferable from the viewpoint of mixing properties with polyester resin, blocking property, solubility in solvent and the like.

On the other hand, the saturated polyester resin has a strong adhesive strength with polyethylene terephthalate or polycarbonate used as a transparent plastic film. As the saturated polyester resin, a polyester resin obtained from a polyhydric alcohol component and a polybasic acid component by a known condensation reaction can be used. The molecular weight of the saturated polyester resin is preferably in the range of 5,000 to 50,000 in view of the adhesive force of the resin, the cohesive force and the solubility in a solvent for forming a varnish.

Saturated polyester resin and polyurethane resin show a well-balanced adhesive strength to both transparent plastic film and photographic paper when blended in a weight ratio of 9/1 to 4/6. The adhesive of the present invention comprises acrylic, a copolymer of vinyl chloride and vinyl acetate, a resin such as nitrocellulose, waxes, talc, carbonic acid, etc. for the purpose of adjusting thermal adhesiveness, improving blocking property, adjusting adhesive strength, etc. Extending pigments such as calcium and barium sulfate, finely pulverized silica and the like can be added.

[0011]

EXAMPLES The present invention will be described in more detail below with reference to examples. (Examples 1 to 3) A polyhydric alcohol component composed of polypropylene glycol and trimethylolpropane and a polybasic acid component composed of adipic acid and azelaic acid were condensed to synthesize a saturated polyester resin having a number average molecular weight of 18,000. A urethane prepolymer was prepared from poly (1,2-propylene adipate) glycol having a molecular weight of 2,000 and isophorone diisocyanate, and then isophoronediamine and di-n-butylamine were mixed and reacted to synthesize a polyurethane resin having a number average molecular weight of 60,000. .

Saturated polyester resin and polyurethane resin were each dissolved in a mixed solvent of methyl ethyl ketone, toluene and isopropyl alcohol to prepare a varnish having a nonvolatile content of 30% by weight. Next, saturated polyester resin varnish /
Polyurethane varnish = 80/20 was mixed (weight ratio) to obtain an adhesive. The obtained adhesive was applied to a polyethylene terephthalate film having a thickness of 100 μm, and various commercially available video print photographic papers on which images were formed by thermally transferring a sublimable dye were attached to each other while heating at 180 ° C. The thermal adhesiveness is shown in Table 1.

[0013]

[Table 1]

Comparative Example 1 A 100 μm-thick polyethylene terephthalate film was coated with ethylene ethyl acrylate, and a sublimation dye was thermally transferred to form a video print paper (Sony “UP5050”) and 180 ° C. I stuck them together while applying heat.

The pouches obtained in Example 1 and Comparative Example 1 were stored at 0 ° C., 20 ° C. and 40 ° C. for 60 days, and the migration of the dye of the color print to the adhesive layer was measured.
The results are shown in Figure 2.

[0016]

According to the present invention, a pouch in which a color print output from a video printer and a transparent plastic film are firmly bonded can be manufactured. Further, since the dye forming an image does not migrate, it is possible to provide a pouch (ID card) that is effective in preventing forgery and does not deteriorate even after long-term use.

[0017]

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a pouch manufactured using the adhesive of the present invention.

FIG. 2 is a diagram showing a relationship between a migration degree of a pouch adhesive and a temperature.

[Explanation of symbols]

 1: Video Print Paper 2: Adhesive for Pouch 3: Transparent Plastic Film a: Pouch Obtained in Example 1 b: Pouch Obtained in Comparative Example 1

Front page continuation (72) Hideyuki Takeda, Inventor Hideyuki Takemaru 2-26-4 Shimomaruko, Ota-ku, Tokyo Fuji Plastic Co., Ltd. (72) Inventor Kiyuki Kawashima 2-26-4 Shimomaruko, Ota-ku, Tokyo Fuji Plastic Co., Ltd.

Claims (1)

[Claims] 1. A heat-adhesive adhesive for use in manufacturing a pouch by bonding a color print output from a video printer for forming an image by thermally transferring a sublimable dye and a transparent plastic film to each other. An adhesive for pouches, characterized in that the adhesive mainly comprises saturated polyester resin and polyurethane resin.