JPH07281471A - Plastic adhesive paper for full-color electrostatic printing - Google Patents

Abstract

PURPOSE:To provide a plastic adhesive paper for full-color electrostatic printing without causing problems concerning to the balance of plural colors, reproducibility or insufficient color density even when three or four full-color toners are used. CONSTITUTION:The printing surface of a printing paper (1a) and the surface of a release base (1c) are impregnated with a conductive filler or coated with an antistatic coating (2a, 2c) to incorporate the conductive filler into the adhesive layer. Thus, surface resistivity and volume resistivity of the adhesive paper for printing is made uniform to obtain sharp printing property with high density and good balance in transfer of four color toners.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive paper for full-color electrostatic printing made of plastic, in which an electrostatic printing paper and a release substrate are adhered via 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, by an optical method, a semiconductor charged with electricity in the same shape as the image,
The electrostatic charge is used to adsorb the toner, and then the toner is transferred onto the printing paper.

There is no problem in electrostatically printing on plain paper, but transfer of toner does not work well with plastic adhesive paper for electrostatic printing. It is considered that this is because the electric resistance of the surface of plastic is too large.
Therefore, it has been proposed to reduce the surface resistance value by applying an antistatic treatment to the surface of the plastic, and it is conventionally said that it is good to set the electric resistance to 10 ⁸ to 10 ¹² Ω.

[0004]

However, according to the study by the present inventor, the electric resistance condition of the printing paper required for good transfer is limited to an extremely narrow range of 10 ¹⁰ to 10 ¹¹ Ω. Turned out to be. In addition, it is necessary to be stable within this range over the entire surface of the printing paper, and if this condition is not satisfied, the transfer density of the toner will change, which may cause unevenness in the transferred image. I understand.

The conventional printing adhesive paper is basically composed of three layers of a printing paper, an adhesive layer and a release base material.
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 coat in order to improve the printing reproducibility of the toner. .

Further, according to the results of earnest studies by the present inventor, if the difference between the surface resistance value of the printed surface and the surface resistance value of the release substrate is 10 Ω or more, the transfer uniformity cannot be obtained. There was found.

However, even if the surface resistance value is lowered, the volume resistance value of the whole adhesive paper for printing remains high resistance, so that the variation of the surface resistance value in the same plane can be suppressed and the printing of the printing paper can be suppressed. It is difficult to align the surface resistance values of the surface and the surface of the release substrate to the same order. For this reason, the transferability of the toner is apt to be insufficient or uneven, and when the full-color three-color or four-color toner is used, there is a problem in that the balance of the four colors is maintained, the reproducibility and the color density are insufficient.

[0008]

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

[0009]

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

[0010]

According to the present invention, the volume resistance of the pressure-sensitive adhesive layer is reduced by adding a conductive substance to the pressure-sensitive adhesive layer as well as the front and back surfaces of the pressure-sensitive adhesive paper. Due to
The volume resistance value of the entire plastic adhesive paper for printing is reduced, and the surface resistance values of the front and back surfaces of the adhesive paper are stable and the difference between them is reduced. It is possible to provide a plastic pressure-sensitive adhesive paper for printing, which can solve the above-mentioned problems in the related art and stably transfer a plurality of color toners with high density and clearly.

[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. 1, the surface (printing surface) of the printing paper 1a and the surface of the release substrate 1c made of a plastic such as polyester or polyamide are coated with an organic or An organic solvent-soluble type or water-, alcohol-soluble type polyester resin to which an inorganic conductive compound is added is coated to a thickness of 5 to 10 μm 2
a and 2c. Further, as the adhesive of the adhesive layer 1b,
An organic or inorganic conductive compound (conductive filler) was added to the rubber or acrylic pressure-sensitive adhesive. In the present invention, the surface electric resistance value and the volume electric resistance value are 10 ¹⁰ to 10 ¹¹
It should be Ω.

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

[0013] As a result, it is possible to provide a plastic pressure-sensitive adhesive paper for printing which is capable of stably transferring toner in a high density and clearly.

FIG. 2 shows another embodiment of the present invention. In the embodiment shown in FIG. 1, the surface (printing surface) of the printing paper 1a and the peeling base material 1c were coated with an antistatic coating, but as shown in FIG. 2, at least the surface of the printing paper 1a and the peeling base material 1c. A plastic film containing an organic or inorganic conductive filler on its side may be molded.

It is also possible to use a plastic in which one of the printed surface and the release substrate is electrostatically coated and the other contains a conductive filler.

[0016]

Example 1 The surface (printing surface) of a printing paper 1a made of a polyester film having a thickness of 50 μ was gravure-coated with the following formulation. Beth Resin S-250 (manufactured by Takamatsu Yushi Co., Ltd.) 100 WK-300 (manufactured by Otsuka Chemical Co., Ltd.) 10 plate 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 Dainichiseika Co., Ltd.) 100 WK-300 (manufactured by Otsuka Chemical Co., Ltd.) 10th edition mesh # 200 Further, on the surface opposite to the printing surface of the printing paper 1a obtained as described above, A pressure-sensitive adhesive having the following formulation was coated to form a pressure-sensitive adhesive layer. Olivine BPS-3511 (manufactured by Toyo Ink Co., Ltd.) 100 Olivine BPS-4640B (manufactured by Toyo Ink Co., Ltd.) 3 WK-300 (manufactured by Otsuka Chemical Co., Ltd.) 10 Coat thickness 20 μ Toluene / ethyl acetate (1/1) 40 Further, adhesive layer The above-mentioned release substrate 1c was laminated on the above. The surface electric resistance value and the volume resistance value of the thus obtained product were measured under the measurement conditions of 22 ° C. × 65% RH, and the results are shown in Table 1.

[0017]

[Table 1] Using this adhesive paper for printing, printing was carried out with a Canon Pixel DIO # 200 full-color copying machine. The printed image had high density and was well balanced with four colors. It was confirmed that a high quality adhesive paper for printing can be obtained by the present invention.

[0018]

According to the present invention, the volume resistance value and surface resistance value of the pressure-sensitive adhesive paper for plastic printing can be reduced, and the stability of these resistance values can be obtained. Provided is a plastic pressure-sensitive adhesive paper for printing, which solves the above-mentioned conventional problems in printing and can stably transfer four color toners stably, at high density, and clearly.

[Brief description of drawings]

FIG. 1 is a sectional view of an 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 Base Material 1c Adhesive Layer 2a Electrostatic Coat 2b Electrostatic Coating 3a Conductive Filler-Containing Printing Paper 3b Conductive Filler-Containing Printing Release Base Material

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area C09J 7/02 JKY

Claims (3)

[Claims] 1. A pressure-sensitive adhesive paper for electrostatic printing in which an electrostatic printing paper and a release substrate are adhered via an adhesive layer, and an antistatic coat is applied to the printing surface of the printing paper and the surface of the release substrate. By 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 clear printing with high density and balanced toner transfer of plural colors. Adhesive paper for full-color electrostatic printing, which is made of plastic and is characterized by its property. 2. A pressure-sensitive adhesive paper for electrostatic printing, comprising an electrostatic printing paper and a release base material 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 can be made uniform, and high density and clear printability with well-balanced toner transfer of plural colors can be obtained. Characteristic plastic full-color adhesive paper for electrostatic printing. 3. A pressure-sensitive adhesive paper for electrostatic printing, comprising an electrostatic printing paper and a peeling base material which are adhered to each other via an adhesive layer, wherein one of the printing paper and the peeling base material contains a conductive filler and the other. By applying an antistatic coating and by incorporating 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 a high balance of toner transfer of a plurality of colors is obtained. Adhesive paper for full-color electrostatic printing made of plastic, which is characterized by obtaining clear printability in density.