Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2002-03-06
2004-05-04
Shosho, Callie (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S437000, C524S439000, C524S441000, C106S494000, C106S640000
Reexamination Certificate
active
06730717
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an aqueous glittering ink composition which can be suitably used for writing tools, printing inks, fields pertaining to coatings, cosmetics, and the like.
2. Description of the Prior Art
Heretofore, for the purpose of obtaining a handwriting with metallic luster such as gold and silver, aqueous ink compositions using glittering pigments have been proposed. For example, Japanese Unexamined Patent Publication No. 7-118592 proposes an aqueous ink composition using an aluminum powder pigment. Japanese Unexamined Patent Publication No. 8-151547 proposes an ink composition using a pearlescent pigment. Japanese Unexamined Patent Publication No. 11-29734 proposes an aqueous metallic ink prepared by coloring an aluminum powder with an organic pigment using a fixing agent.
However, in the case of such conventional aqueous ink compositions using glittering pigments such as aluminum powder pigment, pearlescent pigment and the like, it has been difficult to obtain handwritings or coating films with strong glittering feeling and spatial effect. Moreover, although in order to obtain metallic color a method has been adopted in which these glittering pigments are colored with coloring materials such as dyes and pigments, there has been a problem that the glittering feeling is lost in the coloring step because of the use of a resin.
The object of the present invention is to provide aqueous glittering ink compositions which can provide handwritings or coating films having a stronger glittering feeling in comparison with aqueous ink compositions using conventional glittering pigments, and moreover having together a strong spatial effect which conventional ink compositions never have.
The other object of the present invention is to provide aqueous glittering ink compositions which can provide handwritings or coated films having a strong glittering feeling without losing glitter in comparison with aqueous ink compositions using conventional glittering pigments.
SUMMARY OF THE INVENTION
As a result of intensive studies for achieving the aforementioned objects, the present inventors have adopted an aqueous glittering ink composition containing, at least, a glass flake pigment, a water-soluble resin, a water-soluble organic solvent and water. Furthermore, the present inventors have adopted an aqueous glittering ink composition containing, at least, a metal coated inorganic pigment, a water-soluble resin, a water-soluble organic solvent and water. The “metal coated inorganic pigment” used in the present invention is defined as a general term for inorganic pigments coated with at least one substance of metal and metal oxide.
Accordingly, the aqueous glittering ink composition containing the glass flake pigment can provide a handwriting or a coated films having a stronger glittering feeling and spatial effect than these achieved by aqueous ink compositions using conventional glittering pigments such as an aluminum powder pigment and a pearlescent pigment, because of the high surface smoothness inherent to glass.
Moreover, the aqueous glittering ink composition containing the metal coated inorganic pigment also can provide a handwriting or a coated film having a stronger glittering feeling than that achieved by aqueous ink compositions using conventional glittering pigments without losing glitter, because the inorganic pigment has been colored with metal deposition or the like.
DESCRIPTION OF THE PREFERRED EMBODIMENT
(Glass Flake Pigment)
The glass flake pigment used in the present invention is defined as a pigment which has a structure wherein a flaky glass is coated with metal or the like and has a glittering feeling and spatial effect. As an example, a glass flake pigment formed of a flaky glass coated with metal by electroless plating can be used. For example, ones coated with silver available from Toyo Aluminium Co., Ltd. under the trade names of “Metashine REFSX-2015PS”, “Metashine REFSX-2025PS” and “REFSX-2040PS” can be mentioned.
In addition, a glass flake pigment formed of a flaky glass coated with metal by spattering can also be used. For example, ones coated with silver available from Toyo Aluminium Co., Ltd. under the trade names of “Crystal Color GF2125”, “Crystal Color GF2125-M”, “Crystal Color GF2140” and “Crystal Color GF2140-M” can be mentioned. Also ones coated with nickel-chromium-molybdenum available from the same company under the trade names of “Crystal Color GF2525”, “Crystal Color GF2525-M”, “Crystal Color GF2540” and “Crystal Color GF2540-M” can be mentioned. Also, one coated with brass available from the same company under the trade name of “Crystal Color GF250”, one coated with silver alloy available from the same company under the trade name of “Crystal Color GF1345”, and one coated with titanium available from the same company under the trade name of “Crystal Color GF1445” can be mentioned.
In the present invention, the glass flake pigment preferably has a median diameter of 5.0-100 &mgr;m. When the median diameter of the glass flake pigment is less than 5.0 &mgr;m, the flake particles are so small that the glittering feeling becomes poor. On the other hand, the median diameter of the glass flake pigment of greater than 100 &mgr;m is unfavorable because the ink does not come out of a pen tip easily.
The glass flake pigment of the present invention is preferably contained in 0.01-40% by weight relative to the total amount of the ink composition. When the content of the glass flake pigment is less than 0.01% by weight relative to the total amount of the ink composition, only unsatisfactory glittering feeling and spatial effect can be obtained. When the content of the glass flake pigment exceeds 40% by weight relative to the total amount of the ink composition, the viscosity of the ink increases so high that the fluidity and writing performance of the ink become poor. The optimum content of the glass flake pigment ranges 0.5-30% by weight.
(Metal Coated Inorganic Pigment)
The metal coated inorganic pigment to be used in the present invention comprises, for example, an inorganic pigment which is coated with metal or metal oxide by means of metal deposition or the like. For example, aluminum coated with iron(III) oxide can be used. For example, ones available from BASF AG under the trade names of “Paliocrom Gold L2000”, “Paliocrom Gold L2002”, “Paliocrom Gold L2020”, “Paliocrom Gold L2022”, “Paliocrom Gold L2025”, and “Paliocrom Orange L2800” can be mentioned. In addition, mica coated with iron(III) oxide can also be used. For example, ones available from BASF AG under the trade names of “Paliocrom Red Gold L2500” and “Paliocrom Red L4000” can be mentioned. Moreover, mica-like iron(III) oxide coated with aluminum-manganese can be used. For example, ones available from BASF AG under the trade names of “Paliocrom Copper L3000” and “Paliocrom Copper L3001” can be mentioned. Mica coated with reduced titanium dioxide can also be used. For instance, ones available from BASF AG under the trade names of “Paliocrom Blue Silver L6000” and “Paliocrom Blue Silver L6001” can be mentioned. Moreover, mica coated with titanium dioxide can also be used.
A median diameter of the aforementioned metal coated inorganic pigment also preferably ranges from 5.0-100 &mgr;m in common with the glass flake pigment. The case in which the median diameter is less than 5.0 &mgr;m is unfavorable because the inorganic pigment particle is so small that the glittering feeling becomes poor. The case in which the median diameter exceeds 100 &mgr;m is also unfavorable because when the metal coated inorganic pigment is used in the form of ink for ball-point pens, it does not come out of the pen tip easily.
As for the amount of the metal coated inorganic pigment to be compounded, the pigment is preferably contained in 0.01-40% by weight relative to the total amount of the ink composition in common with the glass flake pigment. When the content of the inorganic pigment is less than 0.01% by weight relative to the total amount of the ink
Murata Naoshi
Sawa Tomohiro
Yamamoto Yuki
Yoshimura Yasuyuki
Esq. Gloria Tsui-Yip
Miskin, Esq. Howard C.
Sakura Color Products Corp.
Shosho Callie
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