Black ink composition for aqueous ballpoint pen and aqueous ballpoint pen
A technology of ballpoint pens and compositions, applied in inks, applications, household appliances, etc., can solve the problems of insufficient black display, insufficient wear suppression of ballpoint pens, etc., and achieve smooth writing, sufficient concentration, and wear-resistant effects
Inactive Publication Date: 2007-06-13
MITSUBISHI PENCIL CO LTD
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Problems solved by technology
[0008] In addition, the present situation of the ink composition for a water-based ballpoint pen using nigrosine black as a coloring material is that although it has been confirmed that it has certain effects in suppressing abrasion and writing distance, etc. , In particular, ballpoint pens with a ball diameter of 0.38mm or less do not sufficiently suppress wear, and there is also a problem that sufficient black color cannot be displayed
Method used
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Examples
Experimental program
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Embodiment 1～14
[0053] Examples 1-14, Comparative Examples 1-6 and Reference Example 1
[0054] Use a blender to prepare the color materials shown in the following table 1 (by mixing 2 or more pigments with different C.I. names to obtain the color color materials A~E) and each ink component according to the following table 2 The mixed composition of Table 3 (mixing unit: % by weight, total amount: 100% by weight) was uniformly dispersed. Aqueous ink compositions corresponding to Examples 1 to 14, Comparative Examples 1 to 6, and Reference Example 1 were obtained.
[0055] For each of the obtained aqueous ink compositions, the ink pH (25° C.) was measured using a pH meter F-24 manufactured by Horiba Corporation.
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Abstract
To provide a black ink composition for an aqueous ballpoint pen and an aqueous ballpoint pen having a reduced wear of a ball receiving seat of a tip, a long writing distance, and having sufficient thickness. The black ink composition for an aqueous ballpoint pen is used in a ballpoint pen with a ball diameter of 0.38 mm or less and contains at least water, a color material and a water-soluble solvent, wherein it is characterized by using, as the above color material, a color material prepared black by mixing two or more pigments having different color indications of the C.I. Name (Colour Index Generic Name).
Description
technical field [0001] The present invention relates to a black ink composition for a water-based ball-point pen used in a ball-point pen with a ball diameter of 0.38 mm or less (extra-fine, ultra-fine) and a ball-point pen using the water-based ink, more specifically, to a A black ink composition for a water-based ballpoint pen and a ballpoint pen using the water-based ink can reduce wear of a ball bearing seat of a pen tip, have a long writing distance, and have sufficient concentration. Background technique [0002] Generally, in a ballpoint pen, the ball rotates due to writing, thereby transferring the ink to the surface to be written on. However, in a ballpoint pen using water-based ink, as the ball rotates, the ball bearing seat (holder) of the metal nib is moved. wear and tear. [0003] Problems like this have been known for a long time, and can be solved by adding water-soluble cutting oil or surfactants, solid lubricants such as boron nitride, or additives such as ...
Claims
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Patent Timeline
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Inventor 上田聪阿部伸哉圆谷祯人
Owner MITSUBISHI PENCIL CO LTD
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