JPS5918239B2 - electrical record mimeograph paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrical recording mimeograph paper used in perforation machines, facsimile machines, and the like.

Conventionally, general electrical recording paper has been produced by using vinyl chloride resin as a binder, kneading conductive fine powder such as carbon black, and additives such as plasticizers and stabilizers as necessary, and uniformly dispersing it into a film. The conductive recording layer is formed into a shape and is usually used alone or by being attached to a base paper.

Image reproduction using such electrical recording mimeograph paper involves optically scanning the original image and converting it into electrical signals.
The electric signal causes a discharge needle in contact with the base paper to discharge, destroying the conductive recording layer in that area and creating perforations. There are some difficulties.

The biggest problem is that they emit a bad odor during use.

In other words, when the conductive recording layer is destroyed by electrical discharge and a perforation is produced, the binder in the conductive recording layer is burned, but this is because vinyl chloride resin is commonly used as the binder, as mentioned above. During combustion, decomposition gas is generated, and its unique odor is unpleasant to the occupants of the room. Due to their nature, operating machines are often used in rooms with little ventilation where they are not affected by outside air, so it is necessary to prevent such unpleasant odors as much as possible. To this end, it is natural that it is better not to use vinyl chloride resin as a binder, but electrical recording mimeograph paper goes through several steps from its molding to its use for printing. In the meantime, various conditions,
For example, film formability as a binder, mechanical strength, flexibility,
Properties that meet conditions such as solvent resistance and electrical properties are required, and it is currently difficult to find a practical product other than vinyl chloride resin that satisfies these conditions. It is. For example, there is a polyethylene resin that does not have chlorine in its structure as a binder with less unpleasant odor, but it is not practical because the mechanical strength and solvent resistance of the formed film are insufficient. 25 Therefore, in the present invention, as a binder for the conductive recording layer of electrical recording mimeograph paper, it is excellent in various properties such as film formability, mechanical strength, flexibility, solvent resistance, and electrical properties, and As a result of investigating substances that do not generate unpleasant odor gas during use, it was found that among 30 chlorinated polyolefins, chlorinated polyethylene satisfies this requirement.

Chlorinated polyethylene is generally obtained by chlorinating fine polyethylene powder in aqueous suspension, but it exhibits the properties of both polyvinyl chloride and polyethylene, and its properties change depending on the degree of chlorination.

The more chlorinated the polyethylene is, the higher its mechanical strength and airtightness become. The final product will be chlorinated vinyl, but in terms of mechanical strength and solvent resistance,
It has been found that these properties can be sufficiently improved even when the chlorine content is as low as, for example, 5% (by weight).

On the other hand, considering the unpleasant odor caused by discharge breakdown when vinyl chloride resin is used as a binder, although the specific structure of the odor is unknown, the odor generated by the combustion of vinyl chloride resin is accompanied by an unpleasant feeling. On the other hand, considering that polyethylene causes less discomfort, it is clear that this is due to the fact that vinyl chloride resin has chlorine in its structure.

The degree to which the generated odor causes discomfort to the human body is determined by the amount of chlorine it contains.Although there are individual differences in the level of discomfort felt, generally speaking, the chlorine content (weight) of the resin is 25%.
%, and below that, there is little generation of unpleasant odor gas and combustion is possible. The same can be said of chlorinated polyethylene, and when the chlorine content is 25% or less, the odor generated during discharge breakdown is not unpleasant. In summary, chlorinated polyethylene, especially chlorinated polyethylene with a chlorine content in the range of 5 to 25%, can be used as a binder for the conductive recording layer in electrical recording mimeograph paper to improve the above-mentioned conventional drawbacks. I understand that.

Even with chlorine dihydride polyethylene, which has a high chlorination rate, by mixing it with polyethylene, the chlorine content of the entire binder can be lowered and the same effect can be achieved.
Base paper using such chlorinated polyethylene as a binder has excellent recording clarity and film flexibility5, and does not stretch or wrinkle due to oil or solvent in printing ink during printing, allowing for accurate printing. A large number of printed images can be obtained. Note that polypropylene may be used as the polyolefin as effectively as polyethylene.

In the present invention, if necessary, an organic pigment or dye such as ZnO and a binder such as chlorinated polyethylene, acrylic resin, vinyl acetate resin, or cellulose resin may be added to the surface of the conductive recording layer. By providing an extremely thin colored layer consisting of the following, it is possible to easily identify the hole after drilling.

Next, embodiments of the invention will be described.

Example 1 15 parts of chlorinated polyethylene with a chlorine content (weight) of 10%, 10 parts of diethyl phthalate as a plasticizer, and 4 parts of carbon burrata as a conductive fine powder were kneaded with two rolls under heat to form pellets. shall be.

The pellets were formed into a film using a melt extruder to obtain an electrographic mimeograph paper having a thickness of 25 microns. When this base paper was laminated with a conductive mount and perforated and printed using a perforated plate-making machine, no unpleasant odor was felt at the time of perforation, and the image quality and printing durability of the copied image were superior to that of conventional chloride paper. The results were as good as when a vinyl resin film was used.

Example 2 A mixture of 5 parts of chlorinated polyethylene with a chlorine content of 30% and 10 parts of polyethylene was used as a binder, 10 parts of diethyl phthalate and 4 parts of carbon black were added thereto, and a thickness of 25 μm was prepared in the same manner as in Example 1. Electrical record mimeographs were obtained.

When this base paper was perforated and printed using a perforation plate-making machine, there was no unpleasant odor at all during the perforation, and the printing durability was good, and the image quality, gradation, and resolution of the printed image were also good. It was good and warm.

For comparison, the binder in Example 2 was 15 parts of chlorinated polyethylene with a chlorine content of 30%.
The odor generated during drilling was somewhat unpleasant.

Claims (1)

[Claims] 1 The main components are conductive fine powder and a binder containing chlorinated polyethylene, and the chlorine content in the binder is 5 to 2.
Electrical recording mimeograph paper having an electrically conductive recording layer of 5%.