JP2543590C - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] Regarding black ink used for ink ribbons for printers such as wire dot printers, a conventional black ink ribbon uses a printer wire for carbon black or black oil-soluble dye contained in the ink. In view of the problems such as abrasion and print bleeding, there is a purpose of providing a black ink for a printer print ribbon that has solved such problems, a black oil-soluble dye, and at least two types of black that give black by blending A black ink for a printer print ribbon is constituted by using a soft organic pigment together. [Industrial Application Field] The present invention relates to a carbon black used for a printing ribbon for a printer such as a computer, particularly an ink ribbon for a printer such as a wire dot printer.
The present invention relates to a black ink for a printer, which gives a black color having a color tone very dark without being blended . 2. Description of the Related Art Various planters are frequently used as print recording means for terminal devices such as computers, and various inks are used for ribbons of print printers such as wire dot printers. Such print ribbons (ink ribbons) are impregnated with ink. In particular, in black print ribbons, carbon black has been used alone or together with a black oil-soluble dye such as nigrosine or aniline black as a colorant. [Problem to be Solved by the Invention] Since the conventional black ink ribbon described above contains carbon black as a coloring agent, the wire of a printer head or the like is worn out, and printing is performed due to the presence of a black oil-soluble dye which is usually used together. There was a problem that bleeding occurred. However, in order to maintain the blackness, clarity and light resistance of the print, a considerable amount of carbon black cannot be excluded from the ink composition for printers. In order to suppress the abrasion of the wire and the like by lowering the blending amount of black, and to prolong the repetitive life of the ink ribbon, it was necessary to blend a considerable amount. Accordingly, the present invention is to develop an ink for an ink ribbon that does not cause the above-mentioned problems of the prior art, that is, abrasion of a wire of a head or bleeding of a print without impairing blackness and light resistance of the print. Aim. [Means for Solving the Problems] According to the present invention, the object is to provide a black oil-soluble dye and a black color tone very close to dark black without compounding carbon black by mixing the black oil-soluble dye. Giving
A printer print ribbon free of carbon black and inorganic pigments , which is used in combination with an organic pigment softer than a high-speed steel or tungsten dot printer wire having at least two kinds of average particle diameters of 0.5 to 0.01 μm giving black by mixing. Black ink is provided. The organic pigment used in the present invention is softer than a printer wire (made of high speed steel or tungsten) and has an average particle size of 0.5 to 0.01 μm, preferably 0.1 to 0.05 μm.
And at least two of these are blended. Typical specific examples of such pigments are as follows. A preferred combination of organic pigments includes a combination of three colors of yellow, cyan, and aagenta, but it goes without saying that the organic pigment of the present invention is not limited to these. Yellow organic pigments: Hansa Yellow, Benzidine Yellow, Vulcan Fast Yellow, Chromophthal Yellow, Lumogen Yellow, Isoindolinone Yellow, Orange Organic Pigments: Benzidine Orange, Vulcan Orange, Permanent Orange, Naphthol Orange, Red Organic Pigments: Para Red, Toluidine Red, permanent bold, brillfast scarlet, lake red, permanent carmine, perylene red Purple organic pigment: quinacridone violet, dioxazine violet, naphthol violet, blue organic pigment: Victoria blue, phthalocyanine blue, fast sky blue, dianisidine blue green organic Pigments: phthalocyanine green, biolanthrone green, permanent brown, perrenbordeaux In the black ink of the present invention, as the black oil-soluble dye used in combination with the organic pigment, any oil-soluble dye conventionally compounded as an ink for a ribbon can be compounded. In the black ribbon for printer printing of the present invention, in addition to the above-described organic pigments and oil-soluble dyes, any commonly used components can be used. Such components include, for example, mineral oil, higher fatty acids, surfactants and the like. Although the composition of the black ribbon for printer printing of the present invention is not particularly limited, preferably, 5 to 20% by weight of an organic pigment and 5 to 15% by weight of an oil-soluble dye are added to other optional components such as a mineral oil, a higher fatty acid and an interface. An activator and the like can be blended. According to the present invention, according to the present invention, the above-mentioned soft organic pigment is used in combination with the ink for a printer ink ribbon, and the oil-soluble dye is blended with the ink, so that a color tone very close to dark black can be provided without blending carbon black. In addition, since these organic pigments are soft and have an appropriate oil-absorbing property, problems such as wire abrasion and printing bleeding can be solved. EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples, but it goes without saying that the technical scope of the present invention is not limited to the following Examples. Two kinds of black ink of the composition shown in Table 1 were blended, impregnated with nylon 6.6 base cloth, and used with Fujitsu's 24-pin dot impact printer DPK-24EH, the most frequently used pin in the standard pattern. When 100 and 100 million strokes are reached, the wear amount of all pins is measured (actually, in addition to the wear of the wire tip, the armature of the base of the pin also wears and the pin height decreases). did. The results were as shown in Table 2. [Effects of the Invention] As described above, according to the present invention, as black ink for a printer print ribbon, two or more soft organic pigments are combined and compounded in place of conventional carbon black, so that wire wear is reduced. The amount can be remarkably reduced, and bleeding of printing can be prevented, so that clear printing can be obtained.

Claims (1)

[Claims] 1. Black oil-soluble dye, carbon black by blending the black oil-soluble dye
An organic pigment that gives a black color with a color very close to dark black without blending , and at least two kinds of average particle sizes that give black by blending, is high-speed steel having a 0.5 to 0.01 μm or softer than a tungsten dot printer wire. combination with carbon black and the printer printing black ink ribbon which does not contain an inorganic pigment.