JPH07120050B2 - Electrostatic recording body - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electrostatic recording body, particularly to an electrostatic recording body suitable for an electrostatic printer plotter used in a computer-assisted automatic drafting machine (CAD).

2. Description of the Related Art In recent years, design technology using a computer has made rapid progress and is widely used in various directions. In particular, technical requirements for an electrostatic recording material used in an electrostatic printer plotter for precision drawings are increasing.

In such an electrostatic recording medium for precision drawings, a resin having an appropriate electric resistance and a good recorded image is used as a binder for the recording layer, and further, such a resin does not curl when applied to a support. It is necessary not to cause blocking or the like.

Various resins have been proposed in order to satisfy such a demand (see, for example, Japanese Patent Publication No. 51-41351).
When used as an electrostatic recording medium in D, thin lines may be broken or dots may be thickened due to abnormal discharge.

OBJECT The present invention has an object to eliminate line breakage and abnormal discharge in an electrostatic recording material particularly used for CAD.

Structure The present invention relates to an electrostatic recording body mainly composed of a substrate, a conductive layer and a recording layer. In the electrostatic recording body, at least one of a polymer electrolyte, an inorganic salt or a surfactant is brought into contact with or rubbed in a dry state on the surface of the recording layer. It is characterized in that a part where only these substances exist and a part where none of these substances exist are formed in a finely intermingled state by being allowed to stand, or by being dot-transferred in a semi-dry state or sprayed in a mist form. It is an electrostatic recording body.

Examples of the above-mentioned polymer electrolyte, inorganic salt and surfactant (hereinafter referred to as polymer electrolyte etc.) are as follows.

◎ Polyelectrolyte (1) Cationic polyelectrolyte Polyvinylbenzyltrimethylammonium chloride, polydiallylammonium chloride, polymethacryloxyethyltrimethylammonium chloride, poly N-acrylamidopropyl-3-trimethylammonium chloride, poly N-methylvinylpyridinium chloride, Poly N-vinyl-2,3-dimethylimidazolinium chloride, polyvinyl trimethyl ammonium chloride, polyacryl trimethyl ammonium chloride, polyethylene imine chloride, polymethacryloxyethyl dimethylsulfonium chloride, polymethacryloxyethyl tributylphosphonium chloride and the like.

(2) Anionic polyelectrolytes Sodium polyacrylate, ammonium polymethacrylate, ammonium polystyrene sulfonate, sodium polyvinyl sulfonate, polystyrene sulfonic acid, ammonium polyvinyl phosphonate, etc.

(3) Nonionic polymer electrolyte Polyethylene oxide, polyacrylamide, polyvinylpyrrolidinone, etc.

◎ Inorganic salts AgNO ₃ , Al (NO ₃ ) ₃ , NH ₄ NO ₃ , Ca (NO ₃ ) ₂ , Ca (NO ₃ )
₂ , KNO ₃ , NaNO ₃ , Ba (NO ₃ ) ₂ , LiNO ₃ , ZnCl ₂ , AlC
l ₃ , NH ₄ Cl, KCl, CaCl ₂ , CeCl ₃ , CsCl ₃ , CuCl ₂ , NaCl,
LiCl, MgCl ₂ , SnCl ₂ , NaClO ₄ , Ba (ClO ₄ ) ₂ , Mg (Cl
O ₄ ) ₂ , K ₂ CrO ₄ , P ₂ O ₅ , KBr, NaBr, MgBr ₂ , LiBr, (NH
₄ ) ₂ CO ₃ , K ₂ CO ₃ , Na ₂ CO ₃ , KHCO ₃ , NaHCO ₃ , KF, NaF, K _{2
PHO 3, NH 4 HPHO 3,} NaSiO 3, KBO 2, NaPO 3, KI, NaI, Na
₂ S, K ₂ S, NaHS, Al ₂ (SO ₄ ) ₃ , (NH ₄ ) ₂ SO ₄ , ZnSO ₄ , K
₂ SO ₄ , Ce ₂ (SO ₄ ) ₃ , NaSO ₄ , MgSO ₄ , K ₃ PO ₄ , Na ₃ PO
_4th grade.

◎ Surfactant (1) Cationic alkylamine salt, alkyltrimethylammonium halide, alkyldimethylbenzylammonium halide, alkylpyridinium halide, alkylamidomethylammonium halide, alkyloxymethylpyridinium halide, polyoxyethylenealkylamine and the like.

(2) Anionic soap such as potassium oleate, funnel oil, oleic acid, isobutylamide, higher alcohol sulfate Na salt or amine salt, polyethylene glycol sulfate,
Fatty acid amide sulfate, olefin sulfate,
Alkyl sulfosuccinate, alkyl allyl sulfonate, alkyl phosphate, alkyl phosphinate, etc. (3) Nonionic glycerin, polyoxyethylene alkyl ether, polyoxyethylene alkylphenol ether, polyoxyethylene alkyl ester, polyoxyethylene Alkylamine, polyoxyethylene alkylamide, sorbitan alkyl ester, polyoxyethylene sorbitan alkyl ester, etc.

(4) Amphoteric system Salts of alkylamines and monochloroacetic acid, sulfated salts of alkylamines, alkylamine sulfonates, phosphate esters and quaternary ammonium salts.

These polymer electrolytes and the like may be used alone or in combination. The shape of the recording layer is not limited as long as it is formed in a so-called scattered state in which portions where these substances exist and portions where these substances do not exist are finely interdigitated.

The method of creating such a scattered state is as follows.

There is a method in which a polymer electrolyte or the like is contacted with or rubbed against the surface of the recording layer in a dry state to perform dot transfer. For example, a. In the manufacturing process of electrostatic recording medium, the roller surface with which the recording layer comes into contact is coated with a polymer electrolyte alone or mixed with other materials, dried and then contacted or rubbed with the surface of the recording layer to cause a dotted transfer. Let

b. In the case of a. above, even if the polymer electrolyte or the like is not directly applied to the roller, it is applied to, for example, pre-printed paper or a film and dried and wound around the roller, and contacted or rubbed with the surface of the recording layer. Then, the dots are transcribed.

There is a method in which a polymer electrolyte or the like is dot-transferred to the surface of the recording layer in a semi-dried state. For example, in the case of a. And b. Of example c.

d. Scatter the polyelectrolyte etc. with a color roll and transfer it to the surface of the recording layer. At this time, the solvent is appropriately evaporated with a blower. (If it is not evaporated, it will not be in a scattered state and the image quality will deteriorate.) E. In the case of d above, another transfer roller is provided on the color roll and the polymer electrolyte is transferred to the recording layer via this transfer roller. Etc. are blown with a blower and are interspersed.

A solution such as a polymer electrolyte is sprayed in a mist form. As described above, according to the present invention, by scattering the polymer electrolyte or the like on the recording surface, abnormal discharge can be eliminated and a good image without line breaks can be obtained.

Hereinafter, the present invention will be described with reference to Examples and Comparative Examples.

Example 1 The following recording layer forming liquid was applied and dried on the conductive layer of a substrate having a conductive layer so that the adhesion amount after drying was 6 g / m ² , to obtain an electrostatic recording body.

Polyvinyl butyral resin (Sekisui Chemical Co., Ltd., S-REC) 50 parts by weight Calcium carbonate 50 parts by weight Toluene 500 parts by weight Then, a cationic polymer electrolyte solution having a fixed component concentration of 5 parts by weight of the following composition is formed on a polyester film as a wire bar. Was applied and dried at 80 ° C. for 2 minutes.

33.3 wt% Chemistat 6300 (manufactured by Sanyo Kasei Co., Ltd.) 50 parts by weight Methyl alcohol 285 parts by weight The surface of the polymer electrolyte material thus obtained and the surface of the recording layer of the electrostatic recording body were superposed and subjected to friction treatment.

When an electrostatic printer plotter (manufactured by Matsushita Electric Industrial Co., Ltd., drastem 8600) was used to print using the thus obtained electrostatic recording medium, a good recorded image was obtained without line breakage or abnormal discharge.

Example 2 30 wt% CP-280 (manufactured by Calgon Co.) 50 parts by weight Methylcellulose 10 parts by weight Clay 10 parts by weight Water 100 parts by weight A dispersion having the above composition is applied to a high-quality paper with a wire bar, and at 110 ° C. for 3 minutes. It was dried.

The surface of the cationic polymer electrolyte material thus obtained and the surface of the recording layer of the electrostatic recording material were superposed and subjected to friction treatment.

When an electrostatic printer plotter (manufactured by Matsushita Electric Industrial Co., Ltd., drastem 8600) was used to print on the thus obtained electrostatic recording material, a good recorded image was obtained without line breakage or abnormal discharge.

Example 3 20 wt% sodium polystyrene sulfonate (manufactured by Toyo Soda) 30
90 parts by weight Methyl alcohol 90 parts by weight The anionic polymer electrolyte solution having the above composition was applied to wood free paper with a wire bar and dried at 80 ° C. for 2 minutes. The surface of the anion-based polymer electrolyte material thus obtained and the surface of the recording layer of the electrostatic recording material were superposed and subjected to friction treatment. When this electrostatic recording material was printed with an electrostatic printer plotter, a good image was obtained.

Example 4 33.3 wt% Chemistat 5500 (manufactured by Sanyo Kasei Co., Ltd.) 20 parts by weight Methyl alcohol 100 parts by weight A cationic polymer electrolyte solution having the above composition was drawn up by a color roll to transfer the polymer electrolyte solution to a transfer roll, The surface of this polymer electrolyte solution was blown with a blower to instantly bring it to a semi-dry state. The surface of the recording layer of the electrostatic recording medium was contact-moved with the surface of the semi-dried polymer electrolyte. When the electrostatic recording material thus obtained was used to print with an electrostatic printer plotter, a good recorded image was obtained without line breakage or abnormal discharge.

Example 5 Sodium chloride 20 parts by weight Water 80 parts by weight The above aqueous solution was applied to a wood free paper and dried at 110 ° C. for 3 minutes.

The surface of the sodium chloride thus obtained and the surface of the recording layer of the electrostatic recording body were superposed and subjected to a friction treatment. When an electrostatic printer plotter was used to print using the electrostatic recording material thus obtained, a good image was obtained.

Example 6 Polyethyleneimine 210T (manufactured by Mutual Yakuko Co., Ltd.) 10 parts by weight Water 90 parts by weight The above cationic surfactant solution was applied to a fine paper with a wire bar and dried at 110 ° C. for 3 minutes.

The surface of the cationic polymer surfactant thus obtained and the surface of the recording layer of the electrostatic recording material were superposed on each other and subjected to friction treatment. When the electrostatic recording material thus obtained was used to print with an electrostatic printer plotter, a good recorded image was obtained without line breakage or abnormal discharge.

Comparative Example 1 Polyvinyl butyral resin (Sekisui Chemical Co., Ltd.)
50 parts by weight Calcium carbonate (White seal 310 manufactured by Takehara Chemical Industry Co., Ltd.) 50 parts by weight Toluene 500 parts by weight The above recording layer forming liquid is applied onto a gas conductive layer having a conductive layer,
An electrostatic recording material was obtained by coating and drying so that the adhesion amount after drying was 6 g / m ² . When this recording material was printed by an electrostatic printer plotter, many line breaks were observed and the image quality was not good.

Comparative Example 2 In Example 4, the transfer roll transfer, the surface of the polymer electrolyte solution was immediately transferred to the surface of the recording layer without blowing with a blower, and the polymer electrolyte was not scattered in the surface but uniformly covered. When the electrostatic recording material was printed with an electrostatic printer plotter, there was almost no discharge, and no image was formed.

Effect The electrostatic recording material of the present invention has extremely few image line breaks and abnormal discharge, and a clear recorded image can be obtained.
The effect when used for D is great.

Specifically, for each of the examples and comparative examples, printing was performed with an electrostatic printer plotter using a 4 cm square continuous square original document. The following table shows the results of visually measuring the number of line breaks and the number of abnormal discharges per 16 squares in each printed sample.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihiko Goto 1-3-6 Nakamagome, Ota-ku, Tokyo Stock company Ricoh Co., Ltd. (72) Taeko Maeda 1-3-6 Nakamagome, Ota-ku, Tokyo Shares Within Ricoh Company (56) Reference JP 54-2128 (JP, A) JP 55-81349 (JP, A) JP 60-57346 (JP, A)

Claims (1)

[Claims] 1. An electrostatic recording body comprising a substrate, a conductive layer and a recording layer as a main layer structure, wherein a polyelectrolyte,
By contacting or rubbing at least one kind of inorganic salt or surfactant in a dry state, interstitial transfer in a semi-dry state, or spraying in a mist form, a portion where only these substances exist and a portion where these substances do not exist An electrostatic recording body characterized in that it is formed in a state in which parts and portions are finely intermingled.