JP2729351B2 - Adhesive paper for full color electrostatic printing made of plastic - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic full color electrostatic printing adhesive paper in which an electrostatic printing paper and a release substrate are adhered through an adhesive layer.

[0002]

2. Description of the Related Art The principle of electrostatic printing is based on transfer of toner by static electricity. That is, a semiconductor charged with electricity in the same shape as an image by an optical method,
The toner is adsorbed by using static electricity, and then the toner is transferred to the printing paper.

Although there is no problem when electrostatic printing is performed on plain paper, transfer of toner does not work well with plastic electrostatic printing adhesive paper. It is believed that this is because plastic has too high a surface electrical resistance.
For this purpose, it has been proposed to reduce the surface resistance by applying an antistatic process to the surface of the plastic, and it is conventionally said that the electric resistance should be 10 ⁸ to 10 ¹² Ω.

[0004]

However, according to the study of the present inventors, the electric resistance condition of the printing paper required for good transfer is limited to a very narrow range of 10 ¹⁰ to 10 ¹¹ Ω. It turned out to be. In addition, it is necessary that the entire surface of the printing paper is stable within this range. If this condition is not satisfied, the transfer density of the toner changes, which may cause unevenness in the transferred image. I understand.

[0005] Conventional adhesive paper for printing is basically composed of three layers: a printing paper, an adhesive layer, and a release substrate.
The present inventor tried to adjust the surface resistance value of the surface of the plastic printing paper to 10 ¹⁰ to 10 ¹¹ Ω by a treatment such as an antistatic coating in order to improve the print reproducibility of the toner. .

Further, according to the results of the inventor's intensive studies, it has been found that when the difference between the surface resistance of the printed surface and the surface resistance of the release substrate is 10Ω or more, transfer uniformity cannot be obtained. There was found.

However, even if the surface resistance value is reduced, the volume resistance value of the entire adhesive paper for printing remains high resistance, and the variation of the surface resistance value in the same plane is suppressed, and the printing of printing paper is performed. It is difficult to make the surface resistance values of the surface and the release substrate the same order. For this reason, the transferability of the toner is apt to be insufficient or uneven, and when three or four full-color toners are used, the problems of insufficient balance maintenance, reproducibility, and color density of the four colors occur.

[0008]

An object of the present invention is to solve the above-mentioned problems, and to use three or four full-color toners.
In particular, it is an object of the present invention to provide a plastic full-color electrostatic printing adhesive paper which does not cause problems of insufficient balance of four colors, insufficient reproducibility and color density.

[0009]

According to the present invention, there is provided an adhesive sheet for electrostatic printing wherein an electrostatic printing sheet and a release substrate are adhered to each other via an adhesive layer. By including a conductive filler on the surface of the material, or performing an antistatic coating, and by including a conductive filler in the pressure-sensitive adhesive layer, the surface electric resistance value and the volume resistance value of the printing adhesive paper are made uniform. The above object is attained by a plastic full-color electrostatic printing adhesive paper characterized by obtaining clear printability at a high density with a balance of toner transfer of a plurality of colors.

[0010]

According to the present invention, the conductive material is added to the adhesive layer as well as the front and back surfaces of the pressure-sensitive adhesive paper to reduce the volume resistance of the adhesive layer. By
Since the volume resistance of the entire plastic adhesive printing paper decreases, and the surface resistance of the front and back surfaces of the adhesive paper stabilizes and the difference decreases, printing of the plastic adhesive printing paper by these electrostatic printing methods is performed. It is possible to provide a plastic adhesive printing paper which can stably transfer toners of a plurality of colors at a high density and sharply by solving the above-mentioned conventional problems.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In the present embodiment, in order to solve the above-mentioned problem, as shown in FIG. An organic solvent-soluble or water / alcohol-soluble polyester resin to which an inorganic conductive compound is added is coated to a thickness of 5 to 10 μm 2
a, 2c. Moreover, as an adhesive of the adhesive layer 1b,
An organic or inorganic conductive compound (conductive filler) was added to a rubber or acrylic adhesive. In the present invention, the surface electric resistance value and the volume electric resistance value are set to 10 ¹⁰ to 10 ¹¹
Ω.

In the present invention, antistatic coatings 2a, 2c are applied to the surface of printing paper 1a and the surface of release substrate surface 1c.
The surface resistance value is adjusted and the pressure-sensitive adhesive layer 1
By adding a conductive filler (conductive substance) to b and lowering the electric resistance of the pressure-sensitive adhesive layer, it is possible to lower the volume resistance of the entire printing paper and to stabilize the surface resistance. Becomes

As a result, it is possible to provide a plastic printing adhesive paper that can transfer toner stably, at a high density, and sharply.

FIG. 2 shows another embodiment of the present invention. In the embodiment shown in FIG. 1, an antistatic coating is applied to the surface (printing surface) of the printing paper 1a and the release substrate 1c. However, as shown in FIG. 2, at least the surface of the printing paper 1a and the release substrate 1c. A plastic film containing an organic or inorganic conductive filler on the side may be formed.

Further, it is also possible to use a plastic in which one of the printing surface and the release substrate is subjected to electrostatic coating and the other contains a conductive filler.

[0016]

Example 1 A gravure coating was performed on the surface (printing surface) of a printing paper 1a made of a polyester film having a thickness of 50μ according to the following formulation. Vesselin S-250 (manufactured by Takamatsu Yushi Co., Ltd.) 100 WK-300 (manufactured by Otsuka Chemical Co., Ltd.) 10 mesh # 200 toluene / ethyl acetate (1/1) 40 On the other hand, the release substrate 1c is a polyester film (thickness 75).
μ) was gravure coated with the following formulation. VM-AL mat D (manufactured by Dainichi Seika) 100 WK-300 (manufactured by Otsuka Chemical Co., Ltd.) 10-mesh mesh # 200 Further, on the surface opposite to the printing surface of the printing paper 1a obtained as described above, An adhesive having the following formulation was coated to form an adhesive layer. Oribain BPS-3511 (Toyo Ink) 100 Oribain BPS-4640B (Toyo Ink) 3 WK-300 (Otsuka Chemical) 10 Coat thickness 20μ Toluene / ethyl acetate (1/1) 40 The above-mentioned release substrate 1c was laminated on the substrate. The surface electrical resistance value and the volume resistance value of the product thus obtained were measured under the measurement conditions of 22 ° C. × 65% RH.

[0017]

[Table 1] Using this printing adhesive paper, printing was performed by Canon Pixel DIO # 200 full color copier. The printed image was high in density, balanced between four colors and clear. It has been confirmed that high-quality adhesive paper for printing can be obtained by the present invention.

[0018]

According to the present invention, the volume resistivity and the surface resistivity of the pressure-sensitive adhesive paper for plastic printing are reduced, and the stability of these resistance values can be obtained. The present invention solves the above-mentioned conventional problems in printing, and provides a plastic printing adhesive paper capable of stably transferring toner of four colors with high density and sharpness.

[Brief description of the drawings]

FIG. 1 is a sectional view of one embodiment of the present invention.

FIG. 2 is a sectional view of another embodiment of the present invention.

[Explanation of symbols]

 1a Printing paper 1b Release substrate 1c Adhesive layer 2a Electrostatic coating 2b Electrostatic coating 3a Printing paper containing conductive filler 3b Printing release base containing conductive filler

Claims (3)

(57) [Claims] 1. An electrostatic printing pressure-sensitive adhesive paper in which an electrostatic printing paper and a release base material are bonded via an adhesive layer, wherein an antistatic coat is provided on a printing surface of the print paper and a surface of the release base material. Then, by adding a conductive filler to the pressure-sensitive adhesive layer, the surface electric resistance value and the volume resistance value of the pressure-sensitive adhesive paper for printing are made uniform, and a high-density and clear printing that balances toner transfer of a plurality of colors. Adhesive paper for full-color electrostatic printing made of plastic, characterized by obtaining good properties. 2. An adhesive sheet for electrostatic printing wherein an electrostatic printing paper and a release base material are adhered to each other via an adhesive layer, wherein the printing paper and the release base material contain a conductive filler. By including a conductive filler in the layer, the surface electric resistance value and the volume resistance value of the pressure-sensitive adhesive paper for printing are made uniform, and a high density and clear printability in which toner transfer of a plurality of colors is balanced can be obtained. Characterized adhesive paper for full-color electrostatic printing made of plastic. 3. An adhesive paper for electrostatic printing wherein an electrostatic printing paper and a release substrate are adhered through an adhesive layer, wherein one of the printing paper and the release substrate contains a conductive filler and the other is a conductive filler. By performing an antistatic coating and including a conductive filler in the pressure-sensitive adhesive layer, the surface electric resistance value and the volume resistance value of the pressure-sensitive adhesive paper for printing are made uniform, and the toner transfer of a plurality of colors is balanced. Adhesive paper for full-color electrostatic printing made of plastic, characterized by obtaining clear printability in density.