JPS6111362A - Recording paper having electromagnetic wave shielding property - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to recording paper that is effective for computer output paper, various securities, bankbooks, electromagnetic wave shielding, and the like.

With the recent development of office automation equipment, entries in various documents, securities, bankbooks, etc. are increasingly performed by computer.

On the other hand, with the development of electronic materials, the aforementioned OA equipment and I
The problem of protecting C, LSI, etc. from electromagnetic interference is rapidly becoming a topic of close attention both domestically and internationally.

Therefore, research is actively being conducted on various materials for electromagnetically shielding electronic materials and OA equipment.

With the rapid development of equipment and electronic materials, cash cards and the like have become widespread, and the frequency of recording in bankbooks and the like has increased significantly.

Taking the above-mentioned bank passbook as an example, in order to prevent it from being easily damaged, relatively thick paper is generally used, so the number of sheets is small and the margins quickly run out. There was a flaw in the clerical procedures that required a new passbook each time, making it extremely time-consuming.

Attempts have been made to use plastic films such as polyester to convert the above-mentioned passbook paper into thin, durable materials, but if polyester films are used as is, they are thin (and strong), but they tend to warp. This caused a defect that could not be recorded on a computer, etc.

Further, since the conventional recording polyester film mentioned above has no conductivity, it is almost impossible to protect the 0Ata device etc. from electromagnetic interference depending on the film.

In view of the above, the inventors of the present invention aimed to provide recording paper for bankbooks, etc., which is thinner than conventional paper sheets and has an increased number of sheets, and which is resistant to warping and damage by making the recording paper itself electromagnetic wave shielding. As a result of a variety of research, we found that by pasting Japanese paper on both sides of a conductive metal-deposited polypropylene film, we were able to create a thin, warp-free (and easy to record) film.
Furthermore, the inventors have discovered that a recording paper with excellent electromagnetic wave shielding effect can be obtained, and have thus arrived at the present invention.

That is, the present invention is a recording paper having electromagnetic wave shielding properties, which is made by applying an adhesive containing a white pigment to both sides of a metallized polypropylene film, and pasting thin Japanese paper on the adhesive. .

The metal vapor-deposited polypropylene film used in the present invention is a polypropylene film on which metals such as silver, copper, and nickel are vapor-deposited, and has a thickness of 7 to 15 μm.

Furthermore, the adhesive containing a white pigment used to attach Japanese paper to the metallized polypropylene film is:
For example, urea resin adhesives, phenolic adhesives, resorcinol adhesives, epoxy adhesives, polyurethane adhesives, polyesters manufactured by blending VPTJ strong white pigments such as titanium dioxide, zinc white, antimony oxide, and zinc sulfide. adhesives, isocyanate adhesives, vinyl acetate adhesives, acrylic adhesives, cyanoacrylate adhesives, copolymerized polymer adhesives, and modified rubber adhesives.

Furthermore, the Japanese paper used in the present invention includes, for example, kozo paper,
It is manufactured by machine-making using Mitsumata, Ganpi, etc. as raw materials, and as the Japanese paper used in the present invention, Japanese paper made from Mitsumata as a raw material is particularly preferable.

In order to attach Japanese paper to the metallized polypropylene film, an adhesive containing a white pigment is applied to the surface of the metallized polypropylene film using a normal coating method such as roll coating, reverse roll coating, Myaba coating, or gravure coating. An electromagnetic wave shielding recording paper can be obtained by laminating Japanese paper on the adhesive-coated surface and drying with hot air at room temperature to 50 to 80°C.

The recording paper having electromagnetic wave shielding properties of the present invention obtained as described above is made by sandwiching a metal-deposited polypropylene film with almost no warpage and laminating thin Japanese paper on both sides, so that it has a thickness of 20 to 40 μm. Very tough despite the temperature.

It almost never warps due to the influence of humidity.

Also, unlike a metal-deposited polypropylene film alone, since thin Japanese paper is attached to the surface of the metal-deposited polypropylene film, letters and numbers can be clearly printed.

Furthermore, since the thin Japanese paper is pasted with a white pigment-containing adhesive, it has the advantage that numbers etc. recorded on the back cannot be seen through.

Therefore, when the recording paper of the present invention is used as a paper for a bankbook, for example, it has the advantage that the number of sheets can be increased significantly compared to conventional bankbooks.

Also, when used as computer paper or securities paper, the volume decreases and saves storage space.
Very effective. □ Furthermore, the recording paper of the present invention has a volume resistivity of approximately 4, OX
It has a 1011Ω mark and has excellent conductivity, so OA
It also has excellent performance as an electromagnetic shielding packaging material for equipment and electronic materials.

Hereinafter, the present invention will be specifically explained with reference to Examples.

Example.

100 parts by weight of polyurethane resin ethyl acetate solution (resin content 40%, titanium dioxide 10%), polyisocyanate (
A two-component white polyurethane adhesive consisting of 8 parts by weight of Coronate L (product of Nippon Polyurethane Co., Ltd.), 0.01 parts by weight of triethylenediamine, and 100 parts by weight of ethyl acetate was applied to a 2.7-Kel deposited polypropylene film with a thickness of 8μ. After coating both sides twice with a gravure roll coater and drying to the touch, both sides were laminated with 10 μm thick Tripole Japanese paper and aged at room temperature for 48 hours to obtain recording paper.

The volume resistivity value of this recording paper is 4. OX Lol+Ω
The stamp was 30μ thick, did not warp, and had excellent printability on computers, making it useful as bankbook paper.

Furthermore, when used in the packaging of OA equipment, it was found to have extremely excellent electromagnetic wave shielding properties.

Claims (1)

[Claims] 1. A recording paper having electromagnetic wave shielding properties, characterized in that it is made by applying an adhesive containing a white pigment to both sides of a metallized polypropylene film, and pasting thin Japanese paper on the adhesive.