Compositions: coating or plastic – Coating or plastic compositions – Marking
Reexamination Certificate
2000-07-13
2003-09-09
Bell, Mark L. (Department: 1755)
Compositions: coating or plastic
Coating or plastic compositions
Marking
C106S031860, C106S031580, C106S031280
Reexamination Certificate
active
06616741
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an aqueous metallic ink composition which can be used for writing tools, particularly for ball-point pens, printing inks, fields pertaining to coatings, and the like, and in particular, which can be suitably used for double-color inks.
2. Description of the Prior Art
Heretofore, various types of aqueous metallic ink compositions have been proposed. For example, Japanese Unexamined Patent Publication No. 63-54475 discloses an aqueous aluminum flake pigment composition for aqueous coating materials comprising aluminum flakes, inorganic phosphoric acids, specific aliphatic compounds, water, water-soluble alcohol, and hydrocarbon oil. Japanese Unexamined Patent Publication No. 63-72771 discloses an aqueous metallic ink composition for writing instruments comprising aluminum paste, a paste, and water-processed pigments, wherein the said paste contains, (a) acrylic emulsion and (b) at least one species of resins selected from polyvinyl alcohols and water-soluble cellulosic resins compounded at a specific proportion. The official gazette of the Japanese Unexamined Patent Publication No. 8-199108 discloses an aqueous pigment ink for ball-point pens containing metallic powder pigments, film-forming resins of the handwritings, viscosity modifying resins, specific compounds, water-soluble organic solvents, and water.
However, in the case of these aluminum powder pigments whose surfaces are usually treated by stearic acids and inorganic phosphoric acids upon making finely-divided particles by grinding and abrasion, colorants are hard to be fixed on the particle surface of aluminum powder pigments, and the colorants are dispersed in the ink compositions, separating from the aluminum powder pigments and thereby generating a difficult problem in developing colors with metallic tones having hues of various types of coloring pigments with colors. Particularly, in the case of a so-called double-color aqueous metallic ink composition generating an outline (an outer contour line) with dyes permeating and dispersing around a center handwriting (center color) formed by aluminum powder pigments when writing on a surface of a sheet of paper, and the like, since the said ink composition comprises dyes, water, and water-soluble organic solvents as well as aluminum powder pigments, it is difficult for the center handwriting (center color) of aluminum powder pigments to develop colors with metallic tones having various types of hues of aluminum powder pigments. Moreover, the coated films using conventional metallic ink compositions have a problem of having lower bonding to non-absorbent surfaces.
SUMMARY OF THE INVENTION
Therefore, it is an object of the present invention to provide for the effective fixing of colorants on the particle surface of aluminum powder pigments and to reduce or eliminate the dispersal into the remainder of the ink composition of colorants intended for the coloring of aluminum powder pigments or their separation from said aluminum powder pigments.
It is a further object of the present invention to provide for the development of colors with metallic tones having hues of various types of coloring pigments with colors.
Further, it is an object of the present invention to provide a double-color aqueous metallic ink composition that generates an outline (an outer contour line) with dyes that permeate and disperse around a center handwriting (central color) formed by aluminum powder pigments when writing on a surface of a sheet of paper; or the like, in which the center handwriting (center color) of aluminum powder pigments develops colors with metallic tones, thereby providing various types of hues to aluminum powder pigments.
It is also an object of the present invention to provide a metallic ink composition that forms coated films with improved bonding to non-absorbent surfaces.
These and the other objects are desirably provided, in accordance with the present invention, by an aqueous metallic ink composition comprising:
a. an aluminum powder pigment,
b. a colorant,
c. a polysaccharide,
d. water,
e. a water-soluble solvent, and
f. a material selected from
i. a polyvinyl pyrrolidone,
ii. a polyethylene oxide, or
iii. a compound thereof.
or, alternatively, by a double color aqueous metallic ink composition comprising
a. an aluminum powder pigment,
b. a polysaccharide,
c. water,
d. a water-soluble organic pigment,
e. a water-soluble organic solvent selected from:
i. an alcohol,
ii. a glycol, or
iii. a glycol ether
having a branched hydrophobic group,
f. a water-soluble dye,
g. a material selected from
i. a polyvinyl pyrrolidone,
ii. a polyethylene oxide, or
iv. a compound thereof
BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENTS
As a result of intensive studies, it has been found that in compositions containing an aluminum powder pigment, a colorant, a polysaccharide, water, and a water-soluble organic solvent material that further contain a polyvinyl pyrrolidone or a polyethylene oxide or a compound thereof, the polyvinyl pyrrolidone or polyethylene oxide or compound thereof appears to act as a binder that fixes colorants on the aluminum powder pigment and can provide aqueous metallic ink compositions containing aluminum powder pigments with the colorants fixed on the surface of the aluminum powder pigments by the polyvinyl pyrrolidone or polyethylene oxide or compound thereof. And it has been found that handwritings can be obtained with ink compositions in accordance with the present invention that are capable of developing colors with metallic luster having the hues of various types of colorants by aluminum powder pigments with the colorants fixed on the surfaces of the aluminum powder pigments when writing on a sheet of paper using this ink composition in accordance with the present invention.
In accordance with the present invention, there is provided an aqueous metallic ink composition comprising:
a. an aluminum powder pigment,
b. a colorant,
c. a polysaccharide,
d. water
e. a water-soluble solvent and
f. a material selected from
i. a polyvinyl pyrrolidone,
ii. a polyethylene oxide, or
iii. a compound thereof,
(the polyvinyl pyrrolidone, polyethylene oxide or compound thereof acting as a binder to fix colorants on the said aluminum powder pigments.)
In addition, in the case of using compounds of any one of polyvinyl pyrrolidone or polyethylene oxide as a preferred embodiment of the invention, it has been found that the coated films produced by ink compositions in accordance with the present invention can obtain excellent bonding to non-absorbent surfaces.
Moreover, in particular, in accordance with the present invention, there is provided a double color (or dual color) aqueous metallic ink composition comprising a double color aqueous metallic ink composition comprising
a. an aluminum powder pigment,
b. a polysaccharide,
c. water,
d. a water-soluble organic pigment,
e. a water-soluble organic solvent selected from
i. an alcohol,
ii. a glycol, or
iii. a glycol ether
having a branched hydrophobic group
f. a water-soluble dye,
g. a material selected from
i. a polyvinyl pyrrolidone,
ii. a polyethylene oxide, or
iii. a compound thereof
(the polyvinyl pyrrolidone, polyethylene oxide or compound thereof acting as a binder that fixes the said coloring pigments on the said aluminum powder pigment.)
The reasons why polyvinyl pyrrolidone or polyethylene oxide easily fixes colorants including colored pigments and the like on the surface of aluminum powder pigments are considered as follows. The concepts mentioned here, however, do not necessarily limit this invention. For example, it is assumed that the pyrrolidone group suspended at the a position of the vinyl group (in the case of polyvinyl pyrrolidone) or the oxygen comprising the ether linkage (in the case of polyethylene oxide) is capable of absorbing colorants as well as acting on the surface of aluminum powder pigments, respectively. Therefore, even though aluminum powder pigments are subjected to a surface treatment, it can be assumed that the color
Sawa Tomohiro
Yamamoto Yuki
Bell Mark L.
Esq. Gloria Tsui-Yip
Faison Veronica F.
Miskin, Esq. Howard C.
Sakura Color Products Corp.
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