Compositions: coating or plastic – Coating or plastic compositions – Marking
Patent
1999-06-09
2000-09-19
Klemanski, Helene
Compositions: coating or plastic
Coating or plastic compositions
Marking
106 3165, 106 3168, 106 317, 106 3175, 106 3177, 106 3186, 106 3195, C09D 1102
Patent
active
061205907
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a water based ink having a metallic lustrous color for a ballpoint pen in which a metal powder pigment as a colorant and a complementary colorant are used and which can provide drawn lines of a metallic color tone such as gold and silver regardless of a color tone of writing paper, more specifically to a water based ink having a metallic lustrous color for a ballpoint pen which inhibits the metal powder from settling even in storing for a long time and which has a good follow-up property and can write continuously.
BACKGROUND ART
Aluminum powder, bronze powder and pearl pigments have so far been used as pigments for obtaining drawn lines of a metallic color tone having metallic luster such as gold and silver.
Since bronze powder has a large specific gravity and is susceptible to oxidative discoloration, the addition of the powder having a particle diameter of about several .mu.m which is required for providing the drawn lines with a metallic lustrous tone is liable to cause problems such as separation by settling, discoloration of the color tone and clogging at the pen tip, and it is very difficult to use the bronze powder for a water based ink for writing instruments.
Aluminum powder has a smaller specific gravity and a less discoloring property as compared with those of bronze powder. However, it has a larger specific gravity as compared with those of conventional pigments and has a defect of oxidative discoloration in a high pH area or a low pH area and a problem that the lines drawn on writing paper having a dark color develops only a silver color.
A pearl pigment comprises mica coated on the surface thereof with titanium oxide and is characterized by that it can provide a metallic lustrous property and a tint of a rainbow color depending on a difference in a refractive index originating in the thickness of the titanium oxide layer.
However, in order to obtain metallic luster close to that of metal powder, a particle diameter of 30.mu. or more is required, and the addition thereof to an ink has caused problems such as separation by settling, clogging at the pen tip and an increase in writing-resistance.
Inks for marking pens using aluminum powder as a metal powder pigment include inks described in Japanese Patent Publication No. Sho 62-37678 and Japanese Patent Publication No. Hei 1-56109. Disclosed in Japanese Patent Publication No. Sho 62-37678 is a double coloring ink composition which comprises a metal powder pigment such as aluminum powder, an oil-soluble dye, a resin and a solvent and in which the dye is penetrated and diffused into the circumference of the drawn lines formed from the metal powder pigment to produce an outline effect.
Disclosed in Japanese Patent Publication No. Hei 1-56109 is a metallic lustrous ink for a marking pen which comprises fine metal powder such as aluminum powder subjected to surface treatment, a resin and a solvent and which has a good ink follow-up property and does not produce a hard cake by the settling of the metal powder pigment in the ink reservoir of the pen barrel.
The ink for a marking pen described above has a problem that since it has a low viscosity and can not inhibit the aluminum powder from settling and separating, a stirring member such as a metal ball is put in the ink reservoir together with the ink, and this marking pen has to be shaken before writing to disperse once again the settled metal powder pigment, otherwise the good ink follow-up property can not be obtained.
Proposed as well are inks for a ballpoint pen which do not use a stirring member such as a metal ball unlike the ink for a marking pen described above.
Disclosed in Japanese Patent Application Laid-Open No. Sho 60-186573 is an ink which is characterized by containing a solvent, a thickening resin soluble in this solvent, a metal powder pigment and a color pigment at least in each prescribed amount and having a viscosity of a prescribed value or more and which has a metallic color and less precipitation of the pigment because of a h
REFERENCES:
patent: 4604139 (1986-08-01), Shioi et al.
patent: 5474603 (1995-12-01), Miyashita et al.
patent: 5944886 (1999-08-01), Hashizume
Iwamoto Kiyoshi
Miyamoto Masaru
Klemanski Helene
Mitsubishi Pencil Kabushiki Kaisha
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