JP2002309193A - Low-temperature laminating sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-temperature laminating sheet that can form a laminate on the surface of a print at a temperature as low as 100 deg.C or below. SOLUTION: The low-temperature laminating sheet has a laminate layer prepared by coating a substrate sheet with a binder having a glass transition point of 100 deg.C or below. The sheet has a lamination temperature of 100 deg.C or below. During lamination, the discoloration of an ink dye by bond break and the decolorizing of an ink containing a sublimable dye by re-sublimation do not occur.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminating sheet capable of laminating the surface of a photograph or printed matter, and more particularly to a laminating sheet capable of laminating the surface at a low temperature.

[0002]

2. Description of the Related Art In recent years, it has become possible to print various kinds of high-quality images using an ink jet printer that ejects ink containing a dye.

[0003] Simple printing is also performed by a simple sticker printer for entertainment. In this printer, an ink ribbon having an ink layer containing a sublimable dye, which is easily available, is used. This ribbon is heated, and the dye fixed thereon is sublimated, and the seal is colored by being colored. Printing has been done.

[0004] In any of the printing methods, a laminate sheet for laminating the surface is used in order to enhance the abrasion resistance of a printed image. As such a sheet, for example, a laminate formed by forming a resin layer of an acrylic pressure-sensitive adhesive or a laminate layer of a vinyl-based or polyester-based hot melt resin layer on a light-transmitting plastic film substrate such as a polyethylene terephthalate film. A film has been proposed (JP-A-07-07618)
No. 5).

[0005]

When a high-quality printed matter printed by an ink-jet printer is laminated by using the above-mentioned laminating sheet, the resin is a resin whose laminated layer is softened at a temperature higher than 100 degrees. Therefore, at the time of lamination, the molecular bond of the dye contained in the ink is cut due to the high temperature, and the color change occurs on the printed surface after lamination.

In addition, when a simple printing sticker for entertainment is laminated using the above-mentioned sheet which is softened at a high temperature, the dye coloring the seal re-sublimates the dye again at the time of high temperature laminating, so that the color missing occurs. Was a problem.

In the production of such a sheet, after forming a laminate layer on a substrate by a coating operation, the substrate is wound up and stored. Occur. Therefore, there is also a problem that a so-called tacking phenomenon occurs in which the laminate layer is peeled off from the substrate during unwinding for the purpose of use.

Further, even when a printed material or the like is laminated, there is also a problem that the molecular structure of the dye in the ink is cut by exposure to ultraviolet light for a long period of time outdoors, so-called discoloration occurs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a low-temperature laminating sheet that can laminate the surface of a printed material at a low temperature of 100 ° C. or less.

Another object of the present invention is to provide a low-temperature laminating sheet free of tacking king.

Still another object of the present invention is to provide a low-temperature laminating sheet which does not cause discoloration of a printed image even after long-term outdoor exposure.

[0012]

The low-temperature laminating sheet of the present invention which achieves the above-mentioned invention is characterized in that a laminate layer comprising a binder having a glass transition point of 100 ° or less is formed on a substrate sheet. Things.

Here, the base sheet is made of a light-transmitting material due to the nature of the laminating sheet, and its transparency is determined according to the purpose of use. As such a light-transmitting material, a plastic sheet made of polyester such as polyethylene terephthalate or polyethylene naphthalate, polyolefin such as polyethylene or polypropylene, or polystyrene can be used. The thickness of the base sheet is not particularly limited and can be conveniently selected depending on the purpose of use and environment.
m.

As the binder, a binder made of an existing organic material such as polyester or polypropylene having a glass transition point of 100 ° or less is used, and polyester resin is preferably used.

A filler for preventing tacking may be added to the laminate layer. Known inorganic powders such as diamond, aluminum oxide, iron oxide, silicon dioxide, silicon carbide, chromium oxide, and cerium oxide can be used as the filler. Further, an existing organic material such as polyester, polypropylene, polyethylene, or polystyrene is used as a raw material, and a material having a glass transition point that softens similarly to a binder can be used. The shape of the organic material is preferably spherical.

The filler additive is 0.1 to 10% of the solid weight of the binder. The average particle size of the filler is 2
３０30 μm.

Further, an ultraviolet absorber for preventing the printed material after lamination from being discolored by ultraviolet rays may be included in the laminate layer. Existing UV absorbers such as benzotriazoles and benzophenones can be used. The amount of the ultraviolet absorber added is 0.1 to 5% based on the solid weight of the binder.

If necessary, the above-mentioned filler and ultraviolet absorber are mixed with the above-mentioned binder and dissolved in a mixed solvent of toluene, xylene, ethyl acetate and methyl ethyl ketone. This is applied on a base material sheet by a known application method such as a reverse roll or direct gravure method,
Form a laminate layer.

Here, in order to improve the adhesion of the printed image, the thickness of the binder forming the laminate layer is 1
0 μm or more is desirable. When the thickness of the binder is smaller than the average particle diameter of the filler, the filler is exposed on the binder, and the tacking phenomenon can be prevented.

[0020]

The laminating sheet of the present invention having a laminated layer containing a filler and an ultraviolet absorber will be described below.

As a binder, 312 unsaturated polyester resin (manufactured by Toyobo Co., Ltd., trade name: Byron 200) was used.
5 g, 25 g of low-density polyethylene having an average particle size of 12 μm (trade name: LE-2080, manufactured by Sumitomo Seika Co., Ltd.), and an ultraviolet absorber (Asahi Denka Co., Ltd.) ) Made by: ADK STAB LA
32) was added, and the mixture was adjusted to have a viscosity of 140 cP with a mixed solvent containing toluene as a main component, and this was used as a paint.

This coating material is applied by a reverse coating method, and the thickness of the binder is reduced on a sheet of a polyethylene terephthalate film having a thickness of 12 μm so that the thickness of the binder is smaller than that of the low-density polyethylene as a filler, ie, 12 μm. The coating process was performed while observing the coating film surface to form a laminate layer as follows.

The laminated sheet obtained by the coating process and the printed matter printed by the ink jet printer are
The printed material was laminated by applying pressure between the rolls heated to 80 degrees.

The laminate layer was sufficiently softened at this temperature, and the lamination of the printed matter was completed. At this temperature, molecular bonds were not broken in the ink dye, and no color change occurred on the printed surface after lamination. Further, in a simple recreational printing seal colored with an ink containing a sublimation dye, the temperature at the time of lamination was low, so that the sublimation phenomenon did not occur again, and thus no color loss occurred.

In each case, no discoloration of the printed image occurred even after long-term outdoor exposure.

Before lamination of the printed material, a lamination layer was formed on the substrate sheet, and even when the laminate was wound, no tacking occurred due to the filler exposed on the binder.

[0027]

The sheet for low-temperature lamination of the present invention is
The temperature at the time of laminating becomes 100 degrees or less, discoloration due to dye bond destruction does not occur due to the high temperature at the time of laminating as in the case of conventional laminating sheet products, and heating to an ink ribbon having an ink layer containing a sublimable dye. Thus, even in a simple recreational printing sticker in which the dye fixed on the ribbon sublimates and is colored on the seal, color loss due to the re-sublimation phenomenon due to the high temperature during lamination does not occur.

Further, in order to form a laminate layer on a substrate sheet in order to manufacture a sheet for low-temperature lamination,
Even if a binder is applied and then wound up, there is an effect that tacking does not occur due to the filler exposed on the binder.

Further, the ultraviolet absorber contained in the laminate layer has an effect that the printed surface can be maintained without causing discoloration of the printed image even during long-term outdoor exposure.

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Claims (11)

[Claims] 1. A low-temperature laminating sheet characterized in that a binder having a glass transition point of 100 ° or less is applied on a substrate sheet to form a laminate layer. 2. The low-temperature laminating sheet according to claim 1, wherein the binder is made of an organic material such as polyester or polypropylene having a glass transition point of 100 ° or less. 3. The sheet for low-temperature lamination according to claim 1, wherein a filler for preventing tacking made of an inorganic powder is added to the binder, and the thickness of the layer of the binder is reduced by the thickness of the inorganic material of the filler. A low-temperature laminating sheet that is smaller than the average particle size of the powder. 4. The low-temperature laminating sheet according to claim 3, wherein the inorganic powder is at least one powder of diamond, aluminum oxide, iron oxide, silicon dioxide, silicon carbide, chromium oxide and cerium oxide. The sheet for low-temperature lamination. 5. The sheet for low-temperature lamination according to claim 1, wherein a filler for preventing tackiness of a sphere made of an organic material having a softening temperature of 100 ° C. or less is added to said binder. A low-temperature laminating sheet wherein the thickness of the layer is smaller than the average particle diameter of the filler sphere. 6. The low-temperature laminating sheet according to claim 5, wherein the sphere is made of an organic material of polyester, polypropylene, polyethylene, or polystyrene. 7. The low-temperature laminating sheet according to claim 3, wherein an additive of the filler is 0.1 to 10% of a solid weight of the binder. 8. The low-temperature laminating sheet according to claim 3, wherein the filler has an average particle diameter of 2 to 3.
The low-temperature laminating sheet of 0 μm. 9. The low-temperature laminating sheet according to claim 1, 3 or 5, wherein an ultraviolet absorber is added to the binder. 10. The low-temperature laminating sheet according to claim 9, wherein the ultraviolet absorber is a benzotriazole-based or benzophenone-based ultraviolet absorber. 11. The low-temperature laminating sheet according to claim 10, wherein the amount of the ultraviolet absorbent added is 0.1 to 5% with respect to the solid weight of the binder. Sheet.