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The present invention relates to printing ink compositions containing pressure-sensitive microcapsules. Business forms, computer recording paper, etc., such as office slips, have become increasingly complex and diverse in recent years as office work becomes more efficient and mechanized, but many of these forms involve multiple copies. In this case, pressure-sensitive copying paper is often used, but general pressure-sensitive copying paper is paper coated with microcapsules containing a so-called leuco-type paint (color homer) solution as a core substance coated on the back side of the paper. (CB paper) and lower paper (CF paper) coated with acidic clay or acidic resin (coloring agent) are overlapped, and the microcapsules in that area are removed using pen pressure or typewriter printing pressure. It is used to record color by destroying the color homer and bringing it into contact with a color developer. However, in this case, the microcapsules are coated on the entire surface, so for example, if you need to copy only a specific number of copies out of a large number of copies, or if you need to copy only a specific part of one slip. In such cases, it is necessary to desensitize the coloring agent in this area using desensitizing ink to prevent it from being copied. Therefore, the above-mentioned method requires a lot of work, and it is inevitable that the microcapsules in the desensitized area will be wasted. In view of the above, if the microcapsules could be applied only to the necessary areas, there would be no need for pressure-sensitive paper over the entire surface, and there would be no need for desensitization using desensitizing ink. In this way, it would be extremely innovative if pressure-sensitive copying paper could be produced with microcapsules coated only in the necessary areas using a method such as spot printing. However, at present, pressure-sensitive copying paper is usually manufactured by applying slurry-like capsules made of a water-soluble binder and additives to paper using water as a solvent, but when this method is applied to spot printing, The drying causes wrinkles in some areas of the copy paper, making it practically impossible to produce pressure-sensitive copy paper by this method. The object of the present invention is to provide a special printing ink composition that makes it possible to produce pressure-sensitive copying paper by such spot printing. The above-mentioned spot printing is performed using a printing method used for ordinary office slips, such as flexo printing, but in this case, in order to avoid dimensional changes due to swelling of the paper, water is used as the ink solvent. Organic solvents such as alcohols, ketones, esters or hydrocarbon solvents are often used. Therefore, the pressure-sensitive capsules contained in the ink used for this purpose must be microcapsules with a wall that is stable against the above solvents, and if the solvent resistance is insufficient, the microcapsules must be The content of the color homer solution is extracted by the solvent, and the capsule loses its original function. On the other hand, if an attempt is made to increase the solvent resistance of the microcapsule wall film and the film is made too thick and strong, the microcapsules will be destroyed by the pressure of a pen or typewriter, etc., resulting in the development of pressure-sensitive copying properties. The original purpose is lost. The subject of the invention is therefore a pressure sensitive
Contains microcapsules that have seemingly mutually contradictory properties: sensitivity) and solvent resistance.
The invention also relates to a special printing ink composition having physical and chemical properties suitable for the above-mentioned spot printing, and by using such a special ink composition, it is possible to print pressure-sensitive capsules, which has been difficult in the past. A method called spot printing becomes possible. The present invention will be explained in detail below. As mentioned above, the microcapsules used in the present invention must have both pressure sensitivity and solvent resistance. A wall film made of a polymeric material with a sulfuric acid is preferred. Among these, a wall film mainly composed of urea-formalin resin is most preferred for the purpose of the present invention, and it is essential to make such a wall film uniform and thin. In addition, considering the physical properties when printing on paper as a printing ink, it is usually preferable to have monocytes or agglomerate aggregates of 1 to 20 microns and a wall film thickness of 0.05 to 0.5 microns. The color homer solution as the substance (core substance) contained in the microcapsules is made by combining crystal violet lactone (CVL), benzoyl leucomethylene blue (BLMB), and other leuco dyes used in pressure-sensitive copying paper with a high-boiling solvent such as alkylnaphthalene. , a solution dissolved in an aromatic hydrocarbon such as diallylalkane. The solvent-resistant microcapsules used in the present invention can be produced by emulsifying and dispersing the color homer solution as the core substance in an aqueous mixture of a urea formaldehyde prepolymer, a water-soluble cationic urea resin, and an anionic surfactant. It can be produced by adding an acid catalyst to a dispersion liquid to cause polycondensation and crosslinking reactions to form capsules. The details of the method for forming the capsules are disclosed in Japanese Patent Application No. 114333/1989 filed by the present applicant. The thus obtained solvent-resistant microcapsules, which have a wall made of a urea-formaldehyde polycondensate and contain a color former solution, can be used in the form of a slurry or in the form of a powder obtained by drying the same for printing ink. Add and mix during preparation stage. Since the printing ink used here is applied to spot printing as described above, the ink solvent may be an organic solvent such as alcohols such as isopropyl alcohol or ethyl alcohol, ketones such as methyl ethyl ketone, esters such as ethyl acetate, or Hydrocarbon solvents such as kerosene and xylene, or vegetable oils such as linseed oil and castor oil are mainly used. In addition,
These ink solvents can be used alone or in combination, and in some cases may be used in combination with a small amount of water. The printing ink also contains an adhesive and other additives commonly used in the preparation of printing inks. Examples of adhesives include natural resins such as rosin, hydrogenated rosin, modified rosin, etc., or synthetic polymers such as petroleum resin, nitrified cotton, ethylene-vinyl acetate copolymer, vinyl chloride vinyl acetate copolymer, etc. obtain. These adhesives are added in an amount of 5 to 45% by weight based on the ink.
An ink composition containing the above is preferred. The content of the above ink solvent in the printing ink varies depending on the printing method and the printing machine used, but it is usually 10%.
~75% (by weight). The amount of the microcapsules added to the printing ink is 5% to 60% in the printing ink composition as a final product.
%, preferably 10% to 35%. The printing ink composition according to the present invention is prepared by mixing a slurry or powder of microcapsules with an ink solvent, an adhesive, and other additives. Unlike ordinary printing ink, it contains pressure-sensitive microcapsules that break down under pressure, so care must be taken during operation to avoid applying too much mechanical pressure. Further, when preparing the above ink composition, a white pigment such as titanium oxide, acid clay, a coloring agent such as a phenolic resin, and zinc chloride as an activator thereof may be added. The printing ink composition prepared in this manner is a pressure-sensitive ink composition in which pressure-sensitive microcapsules are applied only to desired areas by spot printing using a conventional printing method such as flexo printing, offset printing, or gravure printing. It becomes possible to manufacture copy paper. That is, by applying the printing ink composition according to the present invention, there is no need to perform partial desensitization treatment with desensitizing ink using pressure-sensitive copying paper coated with pressure-sensitive microcapsules on the entire surface as in the past. It is now possible to easily provide pressure-sensitive copying paper that can produce clear copies only at desired locations using pen pressure or printing pressure from a typewriter or the like. EXAMPLES The present invention will be described in more detail below by way of examples. Example 1 This example illustrates a method for preparing solvent-resistant microcapsules for use in the present invention. 300g of urea and 730g of 37% formaldehyde aqueous solution
3 g of triethanolamine was mixed with 3 g of triethanolamine, and this mixture was reacted at 70° C. for 60 minutes to prepare a urea formaldehyde resin prepolymer. 100 g of this prepolymer, 20 g of Euramin P1500 (a 38% aqueous solution of cationic urea resin manufactured by Mitsui Toatsu Co., Ltd.) as a water-soluble cationic urea resin, 200 g of water, and 10 g of water.
% triethanolamine aqueous solution and adjust the resulting mixture to pH 5.2 with 10% citric acid aqueous solution, then add 10% triethanolamine as an anionic surfactant.
Add 3 g of Neopellex aqueous solution (alkylbenzenesulfonic acid sodium aqueous solution manufactured by Kao Atlas Co., Ltd.) to prepare Solution A. Separately, an oil prepared by dissolving 30 g of crystal violet lactone in 970 g of diisopropylnaphthalene (DIPN) is used as liquid B (color homer solution). Emulsify 150 c.c. of liquid B in liquid A with a homogenizer to a thickness of 2 to 8Ό, then slowly raise the temperature to 50°C while stirring, and add 10% to this.
Add citric acid aqueous solution to adjust the pH to 2.8. Thereafter, this emulsion was stirred for 1 hour, and then the temperature was lowered to room temperature and stirring was continued for another 10 hours to obtain a microcapsule slurry. The slurry is passed through a membrane filter to separate microcapsules, washed with water, and dried in a hot air dryer at 35°C to obtain 210 g of powdered capsules. 100 parts by weight of the microcapsules obtained as described above were mixed with 500 parts by weight of various solvents, left for 24 hours, and the concentration of the dye eluted into the solvent was measured to examine the solvent resistance of the microcapsules. . The results are shown in Table 1 below.
It is as follows.
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çµæã¯äžèšè¡šïŒã«ç€ºããšããã§ããã[Table] As seen in the above table, it can be seen that the microcapsules of the present invention have excellent solvent resistance. Example 2 Nitrified cotton (nitrogen content 11.0%) was added to a mixed solution of 58 g of isopropyl alcohol and 6 g of methyl ethyl ketone.
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Add floc) and mix. 14 g of the microcapsule powder prepared in Example 1 was added to the resulting mixed solution and mixed to obtain a printing ink composition. This ink composition was applied and adhered to a 100 mm square rubber plate, printed on type paper, and air-dried. The solid content was 7 g/m 2 and the area was coated without wrinkles. I was able to create pressed paper. Example 3 Microcapsule slurry prepared according to Example 1
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Inc. USA), and add 20 g of oxidized starch to this solution and mix well. When the ethanol dispersion of the microcapsules is added to this mixture, a flexotype printing ink composition is obtained. This ink composition was applied and adhered to a 50 mm x 100 mm rubber plate, printed on type paper, and air-dried. The area was coated with a solid content of 6 g/m 2 without wrinkles. I was able to create pressure sensitive paper. Example 4 Modified rosin resin (Hercolyn
Pulp powder (KC floc) 15 is added to the solution obtained by dissolving 30 g of D, HERCULES, Inc., USA).
40 g of the dried microcapsules obtained in Example 1 are added to this mixture and uniformly dispersed to obtain an ink composition. When this ink composition was applied to a gravure type printing machine, it was possible to obtain partial pressure-sensitive copying paper with no wrinkles and uniform printing of only the intended areas. Example 5 After mixing and dissolving 35 g of toluene, 12 g of linseed oil, and rosin (Pentalyn
Add g and mix thoroughly. 10 g of the microcapsule powder prepared in Example 1 was mixed with this mixture and uniformly dispersed to obtain an ink composition suitable for flat plate and offset printing. When this ink composition was used for printing by an offset method, it was possible to obtain partial pressure-sensitive paper in which capsules were applied only to desired areas. In this case, the original plate used had a smooth surface without mesh. Example 6 This example shows the results of measuring the color density of each partial pressure-sensitive paper obtained in Examples 2 to 5. Each of the pressure-sensitive paper sections above was stacked with the capsule-coated side facing the bottom paper coated with salicylate as a coloring agent, and then passed through pinch rolls at pressures of 100 Kg/cm 2 and 400 Kg/cm 2 to form capsules. The density of each color was measured using a reflection densitometer (manufactured by Macbeth, USA, Quantalog Densito
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The results are shown in Table 2 below.
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ãªãã€ãã[Table] Example 7 Isopropyl alcohol 38g Methyl ethyl ketone 6g Nitrified cotton 6g Rosin (Pentalyn 830) 14g Pulp powder (KC floc) 6g Phenol resin 3g Kaolin 4g Zinc chloride 1.5g Talc 1.5g The above mixture was kneaded well, and the resulting mixture was mixed. ,
A mixture of 15 g of the microcapsule powder prepared in Example 1 and 20 g of ethanol is added and dispersed well to obtain an ink composition suitable for flexographic printing. When the ink composition thus obtained was printed on type paper attached to a 100 mm square rubber plate, the solid content was 10 g/ m2 , resulting in partial pressure-sensitive copying without wrinkles. Paper was obtained. This pressure-sensitive copying paper was passed through a pinch roll at a pressure of 400 kg/cm 2 to develop color, and the color density was measured using a reflection densitometer, and the reflection density was 0.80. Comparative Example This example shows, for comparison, the case where microcapsules prepared by using conventionally known gelatin instead of a urea formaldehyde polycondensate for the wall film of the microcapsules were added to printing ink. Add 15 parts by weight of a solution of 3 parts by weight of crystal violet lactone dissolved in 100 parts by weight of diisopropylnaphthalene (DIPN) to a 10% by weight aqueous gelatin solution.
After mixing with 30 parts by weight and emulsifying this mixture with a homogenizer so that the dispersed droplet diameter is 2 to 5Ό,
This emulsion was heated to 50° C., and 40 parts by weight of a 4% by weight aqueous solution of CMC and 50 parts by weight of water were added thereto while stirring slowly, and the pH was adjusted to 4.4 with a 5% aqueous acetic acid solution.
After 10 minutes, this material was cooled to lower the temperature to 5°C, then 4 parts by weight of a 25% glutaraldehyde aqueous solution was added thereto, and after 1 hour, the pH was adjusted to 10 with 10% caustic soda solution.
After raising the temperature to 50°C again and continuing stirring for 30 minutes, the temperature was returned to room temperature to obtain a gelatin capsule slurry. When attempting to separate capsules from this slurry and dry them, it was not possible to obtain isolated capsules, and the whole slurry became rice cake-like. When the same amount of ethyl alcohol was mixed with the above capsule slurry, the capsules agglomerated, and the walls of the microcapsules were damaged and the dye inside was eluted to the outside. When this slurry was applied to color developing paper, there was a noticeable difference. It developed color. From the above results, it was not possible to create an ink composition using an alcoholic or aromatic solvent as an ink solvent using gelatin capsules.