JPH03196043A - electrostatic recorder - Google Patents

Abstract

PURPOSE:To improve the recorded picture quality with a uniform dielectric layer color by incorporating one or >=2 kinds among the amine derivative of an unsaturated carboxylic acid and/or the amine derivative of an unsaturated polycarboxylic acid into the dielectric layer. CONSTITUTION:One or >= 2 kinds among the amine derivative of an unsaturated carboxylic acid and/or the amine derivative of an unsaturated polycarboxylic acid are incorporated in the dielectric layer of the electrostatic recording body. In this case, the settling of the filler grains after the dielectric layer color is formed is controlled, and the partially settled grains, if any, are rapidly and uniformly dispersed in the dielectric layer color by gentle agitation. Since the filler grains are uniformly dispersed in this way, and electrostatic plotter sheet high in recording density, with the fogging, abnormal dots and loss of thin lines reduced and excellent in solid recording is obtained.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to an electrostatic recording medium, and in particular to a CA
D (Computer Aided Design)
This invention relates to an electrostatic recording medium suitable for electrostatic printers and plotters that output monochrome or color drawings in a system.

(Prior art) An electrostatic recording medium is made by providing a dielectric layer made of an insulating resin and a pigment on a conductive support that has been subjected to conductive treatment.A voltage is applied to the surface or both sides of the dielectric layer. After forming an electrostatic latent image and developing it with toner (colored powder or liquid developer), the toner is fixed by heat, pressure, drying, etc. to obtain a record.

Electrostatic recording media have excellent recording speed and record storage properties, and are widely used in the fields of facsimiles and printers. By using a high-resolution recording electrode of 16 dots) and 7 mm, it has excellent features not only in terms of recording speed but also in terms of resolution.

Further, as a large plotter for CAD, an electrostatic plotter has a faster recording speed than a pen plotter, and is suitable for outputting a large number of drawings.

(Problems to be Solved by the Invention) The records output to the electrostatic plotter mainly include a solid area filled with toner and a thin line record area. The solid area must have good recording uniformity, high recording density, and no staining (fogging) due to excess toner adhering to areas other than the recording area. In the thin line recording section, it is necessary that there be no thin line gaps where thin lines are interrupted midway, or abnormal dots where the dot diameter is 3 to 5 times larger than a normal dot. For this purpose, it is necessary to maintain an appropriate distance between the surface of the dielectric layer and the electrodes, and it is necessary to mix filler with an appropriate particle size with an insulating resin to form the dielectric layer.

However, the filler generally has a higher specific gravity than the resin and tends to settle in the dielectric layer collar, causing unevenness of the dielectric layer due to the settling, resulting in the problem of deterioration of the recording quality.

The present invention eliminates the settling of filler particles in the dielectric layer collar, which is a manufacturing problem, or even if the filler particles settle, the filler particles can be quickly and uniformly dispersed in the dielectric layer collar by gentle stirring. Moreover, it is an object of the present invention to provide an electrostatic recording medium that improves the quality of recorded images by realizing a uniform dielectric layer color.

(Means for Solving the Problems) The inventors of the present invention have completed the present invention as a result of intensive studies on solving manufacturing problems and improving recording quality. That is, by including one or more of the amine derivatives of unsaturated carboxylic acids and/or the amine derivatives of unsaturated polycarboxylic acids in the dielectric layer of the electrostatic recording material, the color of the filler particles after color adjustment of the dielectric layer is improved. Sedimentation is suppressed, and even if some sedimentation occurs, the filler particles are quickly and uniformly dispersed in the dielectric layer color by gentle stirring, and in an electrostatic recording material coated with the dielectric layer color, fogging, It has been found that images with high recorded density can be obtained without causing the deterioration of thin line omissions or abnormal discharge.

The filler particle dispersant to be added to the dielectric layer preferably has the following properties.

In other words, (1) the filler particles should not be allowed to settle after adjusting the dielectric layer color and left to stand; (2) it should be possible to prevent the solid aggregation of settled filler particles after adjusting the dielectric layer color and being left to stand; (3) the filler particles should not be allowed to settle in the dielectric layer color. Able to quickly and uniformly disperse settled filler particles by gentle stirring. (4) Good adhesion to the surface of the recording sheet. (5) Ability to form a continuous film surface. (6) Chemically inert. The present inventors have found that amine derivatives of unsaturated carboxylic acids and/or amine derivatives of unsaturated polycarboxylic acids are effective in meeting these requirements.

Examples of amine derivatives of unsaturated carboxylic acids or amine derivatives of unsaturated polycarboxylic acids include olefinic acids,
Unsaturated carboxylic acids such as ricinoleic acid, linoleic acid, stearolic acid, hydroxyhexadecenoic acid, octadecadienoic acid, hydroxyoctadecatocitric acid, nonanedicarboxylic acid, or unsaturated polycarboxylic acids, such as ethanolamine, propatool A reaction product with an amine such as amine, hexanolamine, diethylamine, N-methylethylamine, jetanolamine, dibrobanolamine, etc. can be used.

Generally, the amine derivative of unsaturated carboxylic acid and/or the amine derivative of unsaturated polycarboxylic acid is added to the dielectric layer in an amount of about 0.5 to 5% of the filler weight in the dielectric layer. effect can be achieved. 0.
If it is less than 5%, sedimentation of filler particles in the color cannot be prevented, and if it exceeds 5%, coating unevenness will occur during coating of the dielectric layer, which is not preferable.

Dielectric layer fillers include zinc oxide, titanium oxide, calcium carbonate, silicic acid, silicates, clay talc, fired clay,
Inorganic pigments such as aluminum hydroxide, sericite, mica, barium sulfate, and lithopone, and organic pigments such as polyethylene powder, polystyrene powder, starch powder, and cellulose powder can be used.

The dielectric layer resin used with the dielectric layer filler includes vinyl acetate resin, ethylene-vinyl acetate copolymer resin, vinyl chloride resin, vinyl chloride-vinyl acetate copolymer resin, vinylidene chloride resin, vinyl chloride-vinylidene chloride copolymer resin,
Acrylic ester resin, methacrylic ester resin,
Butyral resins, silicone resins, polyester resins, vinylidene fluoride resins, nitrocellulose resins, styrene resins, styrene-acrylic copolymer resins, and the like can be used alone or in mixtures of two or more.

The ratio of the dielectric layer resin to the dielectric layer filler (R/P ratio) is 515 to 8/2, and the coating is applied onto the conductive layer support so that the dry coating amount is 3 to 5 g/m2. , an electrostatic recording body can be formed. If the R/P ratio and coating amount are outside the above ranges, the recording density may decrease, the surface may become highly glossy, and naturalness and writability are likely to be lost.

The conductive support on which the dielectric layer is coated is a variety of conventionally used supports such as paper, plastic film, polyester film, polypropylene film, polyethylene film, and synthetic paper.
For example, quaternary ammonium salts such as polyvinylbenzyltrimethylammonium chloride, polydimethyldiallylammonium chloride, styrene acrylic acid trimethylaminoethyl chloride copolymer, anionic conductive resins such as polystyrene sulfonate, polyacrylic acid, polyvinyl In addition to phosphonates, metal oxide semiconductors such as zinc oxide, tin oxide, fine metal powders, organic or inorganic salts, surfactants, etc. can be used alone or in combination, and pigments or adhesives may be mixed if necessary to form a conductive layer. You can use the formed one.

The electrostatic recording medium having the above structure has a high recording density with little fog, and has good images with few missing fine lines and abnormal dots.

(Examples) Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited thereto.

Example 1 Polyolefin synthetic paper with a thickness of 90 μm and a basis weight of 88 g/m2 (product name: Yubo TPG-90° egg oil synthetic paper)
A cationic conductive resin (polyvinylbenzyltrimethylammonium chloride: C5-63008,
(manufactured by Sanyo Chemical) was applied so that the weight after drying was 3.5 g/m 2 to obtain a conductive support.

A dielectric layer paint having the following compounding ratio was dispersed with a sand grinder and coated on a conductive support so that the weight after drying was 3.5 g/m'' to obtain an electrostatic recording material.

Calcium carbonate (NS-1000゜Nitto Powdering Department) 3
0 parts talc (L-1, made by Nippon Talc) 10 parts toluene
210 parts Example 2 On the conductive support in Example 1, a dielectric layer paint with the following blending ratio was dispersed using a sand grinder, and the conductive support was mixed so that the weight after drying was 3.5 g/m''. It was applied on the body to obtain an electrostatic recording medium.

Calcium carbonate (MS-1000゜Nitto Powdering Department) 0 parts Silica powder (Syroid 161゜manufactured by Fuji Davison Co., Ltd.) 10 parts Toluene 250 parts Example 3 One side of 45 g/m2 high-quality paper was coated with the following blending ratio for conductivity. A conductive layer was formed by applying a layer coating material so that the coating amount after drying was 5.0 g/m2. On the side opposite to the conductive layer, the same paint was applied so that the coating amount after drying was 2, Og/m2. Smoothing treatment was performed using a super calender so that the Bekk smoothness of the conductive layer surface was 500 seconds.

Calcium carbonate (Belite #500゜Nitto Funka)
30 parts The dielectric layer paint used in Example 1 was applied on the supercalendered conductive layer so that the coating amount after drying was 3.5 g/m2.
An electrostatic recording medium was obtained by applying the following coating.

Comparative Example 1.2.3 Comparative Example 1 was obtained by applying paints having the same composition as in Example 1.2.3 except that the dielectric layer paint did not contain the aliphatic polycarboxylic acid additive. .2.3
I got it.

The electrostatic recording bodies of each example and comparative example were heated at 25°C and 45% R.
After conditioning the humidity with H for 4 hours, recording was made using a Drastemlow 8F 5X electrostatic plotter (Toyo Denki Department). The evaluation results of recording quality after 10 m recording are shown in the table.

(Effects of the Invention) According to the present invention, not only is it possible to prevent the sedimentation of filler particles in the dielectric layer color, which is a problem in manufacturing, and to achieve a uniform distribution of Rk, but also it is possible to achieve high recording density, eliminate fogging, abnormal dots, and thin lines. It is possible to obtain an electrostatic plotter paper with few omissions and good solid recording.

Claims (1)

[Claims] In an electrostatic recording material comprising a conductive layer and a dielectric layer sequentially provided on at least one side of a support, the dielectric layer comprises one or two of an amine derivative of an unsaturated carboxylic acid and/or an amine derivative of an unsaturated polycarboxylic acid. An electrostatic recording material comprising the above.