Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2000-12-21
2003-09-02
Shosho, Callie E (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S091000, C524S094000, C524S106000, C524S556000
Reexamination Certificate
active
06613814
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a water-based coloring composition containing an oil soluble dye, and to an ink for an ink jet which contains the coloring composition, and to an ink jet recording method using the ink for an ink jet. In particular, the present invention relates to a coloring composition whose color reproduction (especially cyan color reproduction) is good and which is suited for water based inks for writing, water based printing inks, inks for information recording, and the like, and to an ink for an ink jet which is suitable for a thermal, piezo-electric, electric field, or acoustic ink jet method, and to an ink jet recording method.
2. Description of the Related Art
In recent years, as use of computers has become more widespread, ink jet printers have become widely used not only in offices, but in homes as well, for printing on paper, film, cloth and the like. Oil based inks, water based inks, solid inks and the like are known as inks for ink jets. Among these, water based inks are advantageous from the standpoints of ease of production, usability, lack of odor, safety, and the like thereof, and therefore, water based inks are mainly used.
However, most water based inks use a water soluble dye which dissolves when in a molecular state. Thus, although there are great advantages with regard to transparency and color density, because the dye is water soluble, the water resistance thereof is poor. Problems arise in that when a water based ink is used for printing onto regular paper, bleeding occurs such that the quality of the printed product markedly deteriorates. Further, the light resistance is poor.
Water based inks using pigments or dispersed dyes in order to overcome these problems are proposed in, for example, Japanese Patent Application Laid-Open (JP-A) Nos. 56-157468, 4-18468, 10-110126, 10-195355 and the like.
However, with these water based inks, although the water resistance is improved to a certain extent, it is still insufficient. There are further problems in that the storage stability of the dispersion of the dispersed dye or pigment within the water based ink is lacking, and it is easy for clogging of the ink discharge ports to occur. Further, with these water based inks, generally, a sufficient hue cannot be obtained, and in particular, the hue of the cyan component is insufficient. Problems in color reproduction arise due to the insufficient color tone.
JP-A Nos. 58-45272, 6-340835, 7-268254, 7-268257, and 7-268260 disclose a method of encapsulating a dye in urethane or polyester dispersion particles.
However, in such cases, the color reproduction is insufficient due to the insufficient color tone. Further, the dispersion stability and water resistance of the dye encapsulating polymer substance, when a dye is encapsulated to a desired concentration, are not always sufficient.
JP-A Nos. 9-59552, 9-111163, 9-255887, and 10-36728 propose improving the color tone by using a colorant in which an aromatic diamine is coupled with a pyrazolotriazole.
However, in these cases, there are problems in that the color tone changes depending on the type of image receiving paper, and the water resistance is insufficient.
SUMMARY OF THE INVENTION
The present invention overcomes the above-described drawbacks, and achieves the following objects. The present invention provides a coloring composition which has excellent dispersion stability of the coloring particulates, has excellent color forming property and excellent color tone (especially cyan color reproduction) when printing onto any type of paper regardless of the paper type, has excellent water resistance and light resistance, and is suitable for use as a water based ink for writing, a water based printing ink, an ink for information recording, or the like. The present invention also provides an ink for an ink jet which is suited for a thermal, piezo-electric, electric field or acoustic ink jet method, which does not cause clogging of a nozzle tip when printing is carried out using nozzles, and which has excellent color forming property and excellent color tone (especially cyan color reproduction) when printing onto any type of paper regardless of paper type, and has excellent water resistance and light resistance, and to an ink jet recording method.
A first aspect of the present invention is an ink for an ink jet comprising: a coloring composition containing coloring particulates dispersed in a water-based medium, the coloring particulates containing an oil-soluble polymer and an oil-soluble dye represented by at least one of following formulae (I), (II), (III), (IV):
formulae (I) through (IV)
wherein, in formulae (I), (II), (III) and (IV), R
1
, R
2
, R
3
and R
4
each represent a hydrogen atom or a non-metallic atomic group; X represents —OH or NR
5
R
6
; R
5
and R
6
each represent a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group; R
7
, R
8
and R
9
each represent a hydrogen atom or a non-metallic atomic group; at least one of R
1
and R
2
, or R
2
and R
5
, or R
5
and R
6
, or R
6
and R
3
, or R
3
and R
4
may form a ring structure; and R
7
and R
8
may bind together to form a ring structure.
A second aspect of the present invention is a coloring composition comprising: coloring particulates containing an oil-soluble polymer and an oil-soluble dye, the dye being represented by at least one of following formulae (I), (II), (III), (IV), seid coloring particulates being dispersed in a water-based medium:
formulae (I) through (IV)
wherein, in formulae (I), (II), (III) and (IV), R
1
, R
2
, R
3
and R
4
each represent a hydrogen atom or a non-metallic atomic group; X represents —OH or NR
5
R
6
; R
5
and R
6
each represent a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group; R
7
, R
8
and R
9
each represent a hydrogen atom or a non-metallic atomic group; at least one of R
1
and R
2
, or R
2
and R
5
, or R
5
and R
6
, or R
6
and R
3
, or R
3
and R
4
may form a ring structure; and R
7
and R
8
may bind together to form a ring structure.
A third aspect of the present invention is an ink jet recording method comprising the steps of: (a) preparing an ink for an ink jet, containing a coloring composition in which coloring particulates, containing an oil-soluble polymer and an oil-soluble dye represented by at least one of following formulae (I), (II), (III), (IV), are dispersed in a water-based medium:
formulae (I) through (IV)
wherein, in formulae (I), (II), (III) and (IV), R
1
, R
2
, R
3
and R
4
each represent a hydrogen atom or a non-metallic atomic group; X represents —OH or NR
5
R
6
; R
5
and R
6
each represent a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group; R
7
, R
8
and R
9
each represent a hydrogen atom or a non-metallic atomic group; at least one of R
1
and R
2
, or R
2
and R
5
, or R
5
and R
6
, or R
6
and R
3
, or R
3
and R
4
may form a ring structure; and R
7
and R
8
may bind together to form a ring structure; and (b) using the ink for recording in an ink-jet printing device.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The coloring composition, the ink for an ink jet, and the ink jet recording method of the present invention will be described hereinafter.
Coloring Composition
The wavelength of maximum absorption (&lgr;max (nm)) of the coloring composition of the present invention must be within a wavelength range of 580 to 700 nm, and is preferably in the range of 590 to 690 nm, and is more preferably within the range of 600 to 650 nm.
When the wavelength of maximum absorption (&lgr;max (nm)) falls within the above first-listed numerical range, the color reproduction is excellent. When the wavelength of maximum absorption (&lgr;max (nm)) falls within the above preferable range or more preferable range, the color reproduction is markedly excellent.
When the absorbance at the wavelength of maximum absorption (&lgr;max (nm)) of the coloring composition is 1, the absorbance at a wavelength 100 nm less than the wavelength of maximum absorption (&lgr;max&m
Adachi Keiichi
Ishizuka Takahiro
Kimura Keizo
Yamada Makoto
Burns Doane , Swecker, Mathis LLP
Fuji Photo Film Co. , Ltd.
Shosho Callie E
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