Compositions: coating or plastic – Coating or plastic compositions – Marking
Patent
1998-11-10
2000-07-04
Klemanski, Helene
Compositions: coating or plastic
Coating or plastic compositions
Marking
106 3168, 106 317, 106 3186, 106 3195, C09D 1118
Patent
active
060833114
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to water based ink having a metallic luster adapted for a direct-filling ball-point pen, which is used by being directly filled into the tube.
BACKGROUND ART
Ink having a metallic luster has already been disclosed in JP-A-61-123684 (the term "JP-A" as used herein means an "unexamined published Japanese patent application"), JP-A-63-95277 and JP-A-4-126782. However, the ink described therein has too low viscosity to prevent the sedimentation of metallic powder having high specific gravity. On the other hand, JP-A-7-145339 discloses "metallic lustrous aqueous ink for a ball-point pen" which can be used by being directly filled into a refill, wherein pseudo-plasticity is imparted to the metallic-lustrous water based ink comprising aluminum powder to prevent the sedimentation of the aluminum powder. However, only the use of aluminum powder and further a color pigment as a complementary coloring agent results in lack of the beauty and luster of the ink. Furthermore, when the aluminum powder is used in the water based ink, a surface thereof is often treated with a petroleum solvent or a higher fatty acid to inhibit reaction with water. However, such a surface condition can not necessarily prevent the reaction completely, leading to deterioration of aging stability.
Further, JP-A-2-142865 discloses bright ink using primary metallic color pigments in which color pigments are chemically adsorbed on the surfaces of metallic pigments (metallic powder) through carboxylic acids each having at least one double bond and two carboxyl groups obtained by thermal polymerization of one or more kinds of double bond-containing carboxylic acids, or secondary metallic color pigments in which the above-mentioned primary metallic color pigments are further covered with polymers of radically polymerizable unsaturated carboxylic acids and monomers each containing three or more radical-polymerizable double bonds.
The present inventors purchased the above-mentioned metallic color pigment (trade name: FRIENDCOLOR) in which a color pigment was chemically adsorbed on a metallic pigment (metallic powder), from Showa Alumipowder Co. Ltd., and examined it in accordance with the procedure of the examples described in the above publication. As a result, it was found that the above-mentioned bright ink was excellent in beauty and luster, as compared with the conventional ink for a writing tool having a metallic luster, in which dyes or pigments are mixed with aluminum powder.
In the above-mentioned publication, ink for a marking pen is disclosed as Example 2, water based ink for a pen as Example 4 and ink for lettering as Example 5. However, the ink described above is ink for writing tools having control members utilizing capillary structures for controlling the outflow of ink from nibs, for example, nibs formed of fiber bundles for the above marking pen or pen wicks arranged between nibs and ink storage tubes for the other pens. Accordingly, it can not be used as direct-filling ink as it is.
There have hitherto been no satisfactory water based ink having a metallic luster adapted for direct-filling in a ball-point pen, which is excellent in beauty and luster and has aging stability.
An object of the present invention is to provide water based ink for a ball-point pen excellent in beauty and luster, having good writing properties, and useful as direct-filling ink, using the above-mentioned metallic color pigment in which the color pigment is adsorbed on the metallic powder.
DISCLOSURE OF INVENTION
As a result of extensive studies for attaining the above-mentioned object, the present inventors have discovered that a metallic color pigment is prevented from being sedimented and good writing properties can be obtained, even when ink is directly filled into the tube, by preventing the reaction of water with metallic powder, and further by imparting pseudo-plasticity to the ink so as to increase the viscosity of the ink high in the tube of a ball-point pen (in a stationary state) and lower the vis
REFERENCES:
patent: 5474603 (1995-12-01), Miyashita et al.
patent: 5944886 (1999-08-01), Hashizume
Fukasawa Teruaki
Kanbayashi Hironobu
Kabushiki Kaisha Pilot
Klemanski Helene
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