JPS6076393A - Electric recording stencil base paper - Google Patents

Abstract

PURPOSE:To improve printing resistance, and to make a picture distinct by laminating a polyolefin group resin film layer containing conductive inorganic fine particles and a liquefied substance and an ionomer resin film layer containing conductive inorganic fine particles and a liquefied substance. CONSTITUTION:Fixed quantities of conductive inorganic fine particles and liquefied substances are each added to a polyolefin group resin and an ionomer resin, and mixed sufficiently by a kneader such as a Banbury mixer. A mixture is two- layer simultaneous co-extruded or three-layer extruded by a proper extruder, or films are formed severally, pasted together and laminated, and a laminate is changed into a film, thus manufacturing an electric recording copying base. Carbon black, graphite, etc. are used as conductive inorganic fine particles, and compounded in 10-50wt%. Liquidized paraffin, mineral oil, etc. are used as the liquefied substance, and compounded in 5-20wt%.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to electrical recording mimeograph paper. Conventionally, electrical recording mimeograph paper uses a film base paper made of a thermoplastic resin mainly composed of polyvinyl chloride containing carbon black. However, when the base paper is subjected to discharge destruction and perforation plate making in accordance with an image signal, there is a strong irritating odor due to the chlorine gas generated during the discharge, and the plate making machine is corroded.

In order to overcome these drawbacks, alternatives using polyethylene resin films have been proposed frequently in recent years, but although they eliminate the generation of irritating odors and corrosion of the plate-making machine,
When peeling the base paper from the backing paper, the base paper curls and rolls up, making it difficult to set it on an automatic rotary copying machine, and because the tensile strength is low, it is easily damaged during printing.

The inventors of the present invention have conducted extensive studies in view of these problems, and have found that an electrical recording paper having a laminated form of a polyolefin resin film layer such as polyethylene and an ionomer resin film layer has an irritating odor during discharge perforation. The present invention was based on the discovery that the printing strength and printing durability are improved because there is no corrosion in the plate making machine, and the elasticity and curling properties are significantly improved, and the tensile strength is also excellent. be.

That is, the present invention comprises a polyolefin resin film layer containing 10 to 50 parts by weight of a conductive fine inorganic powder and 5 to 20 parts by weight of a corrugated substance, and a layer containing 10 to 50 parts by weight of a fine conductive inorganic powder and 5 to 20 parts by weight of a liquid substance. The present invention provides an electrographic mimeograph paper in the form of a laminate of ionomer resin film layers containing a deposit.

Examples of the polyolefin resin used in the present invention include polyethylene, polypropylene, and ethylene-propylene copolymer. Furthermore, examples of the ionomer resin include those having a normal metal cation cross-linked structure. Examples of commercially available products include IJ (trade name) manufactured by DuPont, USA, Himilan (trade name) manufactured by Mitsui Polychemical Co., Ltd., and Kobolene (trade name) manufactured by Asahi Dow Company.

Examples of the conductive inorganic fine powder contained in the polyolefin resin and ionomer resin include carbon black, acetylene black, graphite, copper powder, aluminum powder, etc., and the content is in the range of 10 to 50 parts. If it is less than 1 part by weight, it is difficult to obtain the desired conductive effect, and if it is more than 50 parts by weight, the electrical resistance tends to be too high and the electrical recording characteristics tend to deteriorate.

The liquid substance to be added together with the conductive inorganic fine powder is one that acts as a dispersant and has the effect of dispersing the fine powder well in the resin, and includes, for example, process oil, liquid paraffin, mineral oil, and the like. These liquid substances are contained in an amount of 5 to 20 parts by weight in order to exhibit the effect of dispersing the fine powder.

In order to produce the electrical recording paper of the present invention, predetermined amounts of conductive inorganic fine powder and liquid substance are added to polyolefin resin and ionomer resin, respectively, and Pampari j
Mix thoroughly with a kneader such as a kneader, and then co-extrude two layers or three layers using an appropriate extruder, or layer them by forming films separately and pasting them together to form a film. The thickness of the electrical recording mimeograph paper obtained in this way was 15
The thickness of the polyolefin resin film layer is preferably 20 to 50% of the total thickness. When the thickness is 50% or more, the brightness of perforation becomes significantly worse, and the film strength such as tensile strength decreases.
It is easily damaged during printing. In order to obtain even clearer discharge perforation, it is preferable to adjust the content of the above-mentioned conductive inorganic fine powder so that the electrical resistance value of each film layer is 108 to 1013 Ω.

As described above, according to the present invention, since the polyolefin side film and the ionomer resin film are formed in a laminated form, there is less curling and curling, and the film strength is significantly improved. Further, since the electrorecording mimeograph paper of the present invention has independently large discharge perforation holes, it has a high printing density and can therefore be used for printing lowercase letters.Embodiments of the present invention are shown below and will be described in more detail. Na Jaku, the middle part of the sentence indicates the tribute part.

Example 1 32 parts of carbon black and 15 parts of Diana process oil were added to 65 parts of low-density polyethylene resin and 35 parts of high-density polyethylene resin, and the mixture was mixed in a Banbury mixer to 1
The mixture was kneaded for 10 minutes at a temperature of 30 to 150°C to produce pellets for a polyethylene resin film layer.

Next, 35 parts of carbon black and 10 parts of Diana process oil were added to 100 parts of ionomer resin (trade name: Himilan, manufactured by Mitsui Polychemical Co., Ltd., melt index 2.8), and the mixture was heated in a Banbury mixer at a temperature of 160 to 180°C. Kneading was carried out for 10 minutes to produce pellets for the ionomer resin film layer. Each of the obtained pellets was extruded from a two-layer simultaneous inflation extrusion die at a temperature of 200 to 220°C and the thickness of the polyethylene resin film layer was 20μ. A two-layer film having a thickness of 10 μm was extruded to obtain an electrical recording mimeograph paper.

Example 2 Pellets for a polyethylene resin film layer and pellets for an ionomer resin film layer produced by the same operation as in Example 1 were coextruded in two layers using a T-die, and the thickness of the polyethylene resin film layer was 5 μm. A two-layer film was extruded so that one resin film layer had a thickness of 15 .mu.m, and an electrographic mimeograph paper having an overall thickness of 20 .mu.m was obtained.

Example 3 Pellets for a polyethylene resin film layer and pellets for an ionomer resin film layer produced by the same operation as in Example 1, 100 parts of the ionomer resin used in Example 1, 33 parts of carbon black, and 10 parts of Diana process oil. Using another ionomer resin film layer pellet prepared by adding and kneading in the same manner as in Example 1, a three-layer film was extruded using a KE layer inflation extruder so that the middle layer was a polyethylene resin film layer. , an electrical record mimeograph was obtained. (Polyethylene resin film layer thickness 5 μm snow, ionomer resin film layer thickness each 10 μm 1 Extrusion temperature: Polyethylene resin 160
~180°C, ionomer resin 220°C) Comparative Example Example 1 except that the ionomer resin film layer was not provided.
In the same manner as above, an electrical recording mimeograph paper having a total thickness of 30 μm was obtained.

The electrical recording mimeograph paper obtained in each Example and Comparative Example was bound to a carbon-impregnated mount, and an electrical recording device M manufactured by Fuji Kiden Co., Ltd.
Plate making was performed using the FK2300C output condition 12 characters condition 2), and electrical recording characteristics such as volume resistance, discharge breakdown voltage, printing density, number of printed sheets, presence or absence of irritating odor due to chlorine gas,
The tensile strength and elongation of the base paper in the vertical and horizontal directions at 15 lengths and the presence or absence of curling of the base paper when peeled from the mount were examined, and the results are shown in Table 1.

Table 1 As is clear from Table 1, the present invention has good electrical recording properties, high film strength, and improved printing durability.
In addition, the curling property was eliminated and the perforation brightness was further improved.
A clear image was obtained.

patent applicant Nitto Electric Industry Co., Ltd. Representative: 3rd Department

Claims (1)

[Claims] 1) A polyolefin resin film layer containing 10 to 50 parts by weight of a conductive fine inorganic powder and 5 to 20 parts by weight of a liquid substance, and a layer containing 10 to 50 parts by weight of a fine conductive inorganic powder and 5 to 20 parts by weight of a liquid substance. Electrical recording mimeograph paper consisting of a laminated form of ionomer resin film layers.