JPS6032057A - Electrophotographic transfer sheet containing metal - Google Patents

Abstract

PURPOSE:To enable a sheet to be detected with an approach detector, to be used not only as a printing sheet but also as an electrophotographic transfer sheet satisfactorily with an electrophotographic copying machine, and to make it possible to form an original by all the means by interposing a high-resistance layer having a specific intrinsic resistivity between at least one surface of paper and a metallic layer. CONSTITUTION:A high resistance layer 3, practicably, a layer 3 having a resistivity of >=10<15>OMEGA.cm, on this layer 3 a metal contg. layer 4, such as thin metal film or vapor deposited metal layer, further on this layer 4 a high resistance layer, and a paper sheet are laminated successively on a paper sheet 2 as a support to achieve an intended sheet. A melt extrusible resin, such as PE, PP, ethylene-vinyl acetate copolymer, or ionomer, and a hardening reaction type resin, such as polyester or polyurethane, can be used for the high-resistance layer 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention enables detection by a proximity detector, allows preparation of manuscripts by any means such as close-up photography, and furthermore, can be performed under an electrophotographic transfer sheet containing a circle of a metal or a metal compound. It is about improvement.

With the introduction of office copy machines and facsimile machines, confidential J
It would be highly desirable to provide a practical means to prevent unauthorized copying of copyrighted documents or copyrighted records, and several methods have already been proposed. The present inventors also processed document sheets by vapor-depositing, coating, impregnating, pasting, etc. with metal, and also provided means for detecting and responding to the metal in document sheets in accordance with the scanning exposure process during copying. I proposed the device first.

The present invention is an improvement of an electrophotographic transfer sheet that can be used to prevent copying of information once created by means such as copying or printing in the above-mentioned confidential document copy prevention device proposed by the present inventors. The purpose is to

Conventionally, aluminum-deposited paper for discharge recording, for example, is known as a metal-containing sheet.

As shown in the cross-sectional view in FIG. 1, this material has carbon@111. Aluminum vapor deposition 11c and white conductivity 1
i11d. Even if such a metal-containing sheet is passed through an electrophotographic copying machine to obtain a copy, the electric charge will escape due to its low electrical resistance, so transfer cannot be performed, so it can be used as an electrophotographic transfer sheet. did not previously exist.

In addition, the present inventors have already filed a patent application for an electrophotographic transfer sheet containing metal (Japanese Patent Application No. 57-146).
No. 823), and the present invention is a further improvement thereof.

The present invention is an electrophotographic transfer sheet that can be detected by a proximity detector, has sufficient sheet passability for an electrophotographic copying machine, and can be used not only as a printing paper (but also as an electrophotographic transfer sheet), and can be used to create manuscripts by any means. It provides sheets.

When a sheet having the structure described in the earlier application is passed through a copying machine such as the Xerox product, if the metal layer and the paper or plastic film sandwiching it are made thicker, the sheet becomes too stiff and jams occur in the copying machine. Something happened. Additionally, there were machines that caused transfer defects in high-humidity environments. Furthermore, if the metal layer and the paper or plastic film sandwiching it are made thinner to prevent jamming, the metal layer and the paper or plastic film will wrinkle during the manufacturing process, making it difficult to obtain a sheet with a satisfactory three-layer structure. Furthermore, even if the product could be manufactured successfully, the problem of poor transfer in a high-rise environment could not be resolved.

The proximity detector is capable of detecting any metal in a non-contact state by utilizing changes in the impedance of the oscillation coil of the high frequency oscillation circuit due to eddy current loss, and its internal structure is well known, so details will be omitted.

The present invention has been made to solve the above-mentioned conventional drawbacks. For example, as shown in FIG. Specifically, a layer having a specific resistance of 1015 Ω·cm or more, further a metal-containing layer 4 such as a thin metal layer or a metal vapor deposited layer thereon, and further the above-mentioned high-resistance layer.

This was achieved by arranging the sheets of paper in sequence.

Furthermore, as shown in FIG. 3, it is also possible to omit one high-resistance layer.

The reason why the structure of the present invention as described above can improve transfer defects at high humidity is that the presence of a high resistance layer
C. (This is because it becomes difficult to dissipate the charge by the transfer corotron in electrophotographic copying.

Materials that can be used as the high-resistance layer include polyethylene, polypropylene, ethylene vinyl acetate copolymers, melt-extruded films of ionomers, and hardening reactive resins such as polyester and polyurethane.

Examples of the electrophotographic transfer sheet of the present invention are shown below.

This will be explained using a comparative example.

Example 1 Commercially available high-quality paper with a basis weight of 30Q/m2 and aluminum foil with a thickness of 7μ were laminated together by a polyethylene extrusion lamination method. The thickness of the polyethylene at this time was 20μ, and the specific resistance value of the polyethylene was 3×100·mark.

The non-laminated surface of the aluminum foil was laminated again with a commercially available high-quality paper having a basis weight of 30 g/I2 by the polyethylene extrusion lamination method to obtain a laminated paper containing aluminum foil in the middle.

Example 2 A two-component polyester resin was coated on a 7μ thick aluminum foil, and after drying, a high quality paper with a basis weight of 85 Q/'llI2 was adhered by pressure. The thickness of the polyester resin in case C was 10 μm, and the specific resistance value was 2×10 15 Ω·mark. Further, a two-component reactive polyester resin was applied to the non-laminated side of the aluminum foil, and after drying, high-quality paper with a basis weight of 35Q/I2 was adhered by pressure.

Comparative Example 1 A polyacrylic acid ester emulsion was coated on a commercially available high-quality paper with a basis weight of 400/m2, and a 7 μm thick aluminum foil was layered and dried. The dry weight of polyacrylic acid ester is 10Q,
/m2, and the specific resistance value was 8×1 (1Ω· mark).A commercially available high-quality paper coated with a polyacrylic acid ester emulsion was further laminated on top of this aluminum foil.

Examples 1-2. Regarding the sheet obtained in Comparative Example 1, the electrophotographic copying machine copying performance and copying machine runnability test data are shown in the following table.

Margin below From the above table, the excellent properties of the sheet of the present invention are clear.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of conventional aluminum vapor-deposited paper for discharge recording, Figure 2
3 and 3 are cross-sectional views of an example of a metal-containing transfer sheet for electrophotography according to the present invention. FIG. 2 shows a case where the sheet has a high resistance layer on both sides, and FIG. 3 shows a case where it has a high resistance layer on only one side. In the case, indicate. 7a...Base paper 1t...Carbon garden 10...Aluminum vapor deposited layer 1d...White conductive layer 2...Paper 3...High resistance layer 4...Metal Contained layer Figure 1 Figure 2 Figure 3 Procedures Amendment September 6, 1158 Kamei Kazuo Wakasugi 1. Special request for indication of the case Sho 58-14'+1, title of the invention Metal-containing transfer sheet for electrophotography 3, person making the amendment Relationship to the case Patent applicant 41 Address 1-4-5 Marunouchi, Chiyoda-ku, Tokyo Name 1
234) Sanyo Kokusaku Valve Co., Ltd. President and Director Tadashi Nasu Koji Address 3-3-5 Akasaka, Minato-ku, Tokyo Name (54)
9) Representative Director of Fuji Xerox Co., Ltd. Sumi Kobayashi Aya Rihito Address: 1-4-5 Marunouchi, Chiyoda-ku, Tokyo 100 2, Address: 1-4-5 Marunouchi, Chiyoda-ku, Tokyo (Published on the same date @Mshoku iti'if?, Enhakuyama) ) 6. The following points in the detailed description of the invention column 7 of the specification to be amended will be amended. (1) The 7th negative table will not be corrected as shown in the following table. Table O: Good △: Usable ×: Unusable J, C Supplement -1 1972 b September 8, 1989 Q @ i'r Agency Director Wakao Tanisugi '1. Indication of the case: Akira Kan 58”i41'120 No. 1 Name of the invention: Electrophotographic pot element-containing transfer sheet 3, person who made the amendment Relationship to the case Patent applicant address: 1-4-5 Marunouchi, Chiyoda-ku, Tokyo Name t2
341 Yamasumi Kokusaku Valve Co., Ltd. President Nasu
Tadami Address: 3-3-5 Akasaka, Minato-ku, Tokyo Name (M9)
j Fuji Xerox Co., Ltd. Representative Director Sumi Kobayashi
Thick Section 4, Agent 100 Address: Marunouchi'I-4-56, Chiyoda-ku, Tokyo, Column 7 of Detailed Description of the Invention of the Specification Subject to Amendment, Amended the following points in the description of the contents of the amendment. I will. (1) The 7th negative table has been corrected as shown in the following table.1゜Table

Claims (1)

[Claims] 1 In a metal-containing transfer sheet for electrophotography in which paper is laminated in a sandwich on both sides of a metal layer or metal compound layer that can be detected by a proximity detector, there is a gap between the paper on at least one side and the metal N. Specific resistance 10″Ω・
A metal-containing transfer sheet for electrophotography, characterized in that a high resistance layer of cm or more is interposed.