JPS5871190A - Hectographic mimeograph - Google Patents

Abstract

PURPOSE:To mimeograph clearly without smearing hands or the like, by a method wherein a hectographic carbon paper is prepared by using an oil-soluble colorless or light-colored leuco dye, and color is formed by extraction with a color-forming liquid containing a color developer. CONSTITUTION:A colorless or light-colored ink prepared by adding a dispersing agent to a mixture containing about 30-60wt% of a colorless or light-colored electron-donative organic compound such as triphenylmethane compound and about 20-60wt% of a hot-melting wax form substance is melted by heating, and is coated on a wood free paper in an amount of about 15-20g/m<2> to prepare a hectographic carbon paper. A wood free paper is laminated on the coated surface of the carbon paper, and characters or figures are written with a ball- point pen or typewritten by a typewriter or the like to produce a master sheet. On the other hand, an aromatic carboxylic acid, a derivative thereof or the like soluble in an alcohol or the like is placed in a hectographic mimeograph as a color developer, while the master sheet is set on the mimeograph, and the characters or the figures are mimeographed.

Description

[Detailed description of the invention] The present invention relates to a hectograph transcription method.

In the conventional hectograph copying method, a master sheet Kawahara is printed on hectograph carbon paper, which is a paper or plastic film coated with carbon ink containing a large amount of basic dyes that are easily soluble in alcohol, such as methyl violet, crystal violet, and rhodamine B. Layer the papers together and transfer the ink onto the base paper using appropriate means such as pen pressure or heating.The resulting master sheet is set on a rotary press, etc., and printed on paper coated with a solvent such as ethanol. It is a mimeograph method that transfers ink.

In this case, the hectograph carbon ink contains colored dyes that are easily soluble not only in alcohol but also in water, which has the disadvantage of staining the hands and clothes of workers. In order to prevent such staining, a method of coating wax or the like on the carbon ink layer is usually adopted, but this is not sufficient as a stain prevention method because the dye is exposed on the master sheet.

A method of copying using hectograph carbon ink containing a colorless or light-colored leuco dye that changes color by reacting with a color developer has also been proposed; This method has not been put into practical use due to the high cost of paper.

The present invention has been made to solve the above-mentioned problems in the conventional hectograph copying method. The invention consists in a hectograph copying method characterized by copying carbon ink containing a leuco dye applied to paper and transferred onto a master sheet.

The leuco dye used in the present invention is a colorless electron-donating i]organic compound known per se, such as a triphenylmethane compound, a fluoran compound, a phenothiazine compound, a leuco auramine compound, a spiropyran compound, a rhodamine lactam compound, a triphenylmethane phthalide compound. etc., including crystal violet lactone, malachite green lactone, rhodamine B lactam, 3-dialkylamino-7-dialkylaminofluoranes, 3-
Examples include methyl-2,2'-spirobi(benzo-[f]-lilomene). These dyes may be used alone or as a mixture of two or more.

The amount of leuco dye blended is 30 to 60% by weight, and 30% by weight.
If it is less than 60% by weight, the number of copies will be small and the color density will be low, and if it exceeds 60% by weight, the fluidity of the ink will be poor. .

The waxy substances used in the present invention include natural or synthetic waxes, fatty acid amides, higher alcohols, paraffins, nitroparaffins, fatty acid ketones, fatty acid imides, fatty acid glycerides, etc., such as carnauba wax, montan wax, sugarcane wax, etc. , Hoechst wax (S10, OP), Varico wax, polyethylene wax, oleylamide, stearylamide,
Cetyl alcohol, nitroparaffin (oxazoline)
, stearone, stearic acid monoglyceride, and the like.

The amount of wax-like substance blended is 20 to 60% by weight, and if it is less than 20% by weight, the fluidity during heating and melting will be poor and coating suitability will be poor, and if it is more than 60% by weight, the number of copies will be small and the degree of color development will be low. .

The oily substances used in the present invention include diallylmethane (manufactured by Nisseki Chemical Co., Ltd./1 Isol 5AS), alkylnaphthalene (
In addition to the solvents used in pressure-sensitive copying paper, such as KMC (manufactured by Kureha Chemical Co., Ltd.), chlorinated paraffin, and hydrogenated terphenyl, plasticizers (DBP, DOP, TCP).

BBP, etc.), mineral oil, etc.

The blending amount of the oily substance is 0 to 40% by weight, and if it exceeds 40% by weight, the ink becomes soft and there is a risk of staining the master sheet.

In addition to the above-mentioned components, the carbon ink may optionally contain conventional additives such as dispersants.

Carbon ink containing the above-mentioned ingredients may be prepared according to a conventional method.

Examples of color developers used in the present invention include aromatic carboxylic acids and their derivatives that are soluble in alcohols, aromatic hydroacids, etc. Specifically, benzoic acid, p-Ler
t-Gtylbenzoic acid, salicylic acid, 3-phenylsalicylic acid, zinc salicylate, salicylic acid/formaldehyde polycondensate, P-phenylphenol/formaldehyde F
Examples include f/m compound, P-fluorophenol/formaldehyde polycondensate, bisphenol A, p-furkylphenol, etc., and these may be used alone or as a mixture of two or more.

The color developer concentration of the color developer containing the above color developer is usually 0.
If the content is 2 to 20%, and if it is less than 0.2%, sufficient color density cannot be obtained, and if it exceeds 20%, drying properties become poor.

Further, the solvent for the coloring liquid is generally a lower alcohol such as ethanol, methanol, propatool, etc.

The colorless or light-colored carbon ink obtained in the above manner is melted by heating and printed on high-quality paper at approximately 15 to 20 fI/d.
Prepare hectograph carbon paper by coating. A master sheet is created by overlaying high-quality paper on the coated surface of the hectograph carbon paper and writing with a ballpoint pen or the like or by printing with a typewriter or the like. Put the above coloring liquid into a hectograph mimeograph machine, set the master sheet, and make a mimeograph.

According to the method of the present invention, approximately 200 clear copies can normally be made using one master sheet.

In the present invention, hectograph carbon paper is prepared using an oil-soluble colorless or light-colored leuco dye, and the color is extracted and colored with a colorless or light-colored developer coloring solution, so that it does not contaminate the hands or clothes of workers. Therefore, unlike the conventional method, there is no need to further apply wax or the like on the carbon ink layer, and the mimeographing performance of the method of the present invention is not inferior to that of the conventional method.

The present invention will be explained below with reference to examples (in the examples, "parts" represent "parts by weight").

Example 1 (Preparation of hectograph carbon ink) 15 parts of cetyl alcohol, 5 parts of carnauba wax, 15 parts of lanolin, 1 part of Motorura, Hysol 5AS-296
(Japan Petrochemical Co., Ltd. allyl alkane compound) 10 parts and crystal violet lactone 45 parts about 100 parts
Hectograph carbon ink was prepared by heating to ℃ and grinding with a sand mill.

Example 2 (Preparation of hectograph carbon paper) While keeping the hectograph carbon ink obtained in Example 1 at 100°C, a coating amount of about 18
Hectograph carbon paper was prepared so that P/d.

Example 3 (Preparation of master sheet) A master sheet was prepared by layering high-quality paper on the coated surface of the hectograph carbon paper obtained in Example 2 and writing with a ballpoint pen.

Example 4 (Preparation of coloring liquid) A coloring liquid was prepared by stirring and dissolving 2 parts of bisphenol A in 98 parts of ethanol at room temperature.

Example 5 When the master sheet obtained in Example 3 was set in a hectograph copying machine and copied using the coloring liquid of Example 4, a clear blue copy of ix5° was obtained.

Patent applicant: Naigai Ink Manufacturing Co., Ltd. ii;;2. “”.

1 person: 14
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Claims (1)

[Claims] (1) A coloring liquid containing a color developer that reacts with leuco dye to form a color is applied to paper just before copying, and carbon ink containing leuco dye is transferred to a master sheet on top of the paper for copying. A hectograph mimeograph method characterized by 2. The method according to item 1, wherein the coloring liquid is an alcohol solution in which 0.2 to 20% of an aromatic carboxy compound and/or an aromatic hydroxy compound is dissolved. 3. The method according to item 1, wherein the carbon ink contains 30-60% by weight of leuco dye, 20-60% of waxy material and 0-40% (by weight) of oily material.