Compositions: coating or plastic – Coating or plastic compositions – Marking
Reexamination Certificate
2001-04-03
2004-02-03
Klemanski, Helene (Department: 1755)
Compositions: coating or plastic
Coating or plastic compositions
Marking
C106S031460, C106S031470, C106S031490, C106S031600, C106S031760, C106S031770, C106S031780
Reexamination Certificate
active
06685767
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a novel methine compound, a recording liquid for ink jet which recording liquid contains the methine compound, and an ink jet recording method using the recording liquid for ink jet.
2. Description of the Related Art
When a colorant is used for various inks, it is severely desired that the fastness of an image is high. From the viewpoint, it is preferable to disperse a solid fine particle colorant such as a pigment in a medium than to dissolve a colorant in a medium. Currently commercially available pigments has high fastness, however, hue is inferior to that of a dye which is used by being dissolved in a medium. For example, although quinacridone pigments (e.g., C. I. Pigment Red 122, Pigment Red 202, etc.) described in “Industrial Organic Pigments, Second Completely Revised Edition” (W. Herbst, K. Hunger, VCH, 1997) pp. 454 to 474, are fast, an improvement in hue has been desired.
Oxonol compounds which are a kind of methine compound are important as dyes, sensitizing colorants for photography, colorants for optical information recording, dyeing agents for an organism sample such as a cell or the like, or medicines, and are characteristic in that there are many those whose absorption spectra in a solution are sharp.
However, although the oxonol compounds manifest sharp absorption in a solution, the absorption is different when the solution is used as a recording liquid, and sometimes the absorption is broad.
Further, since a chromophore thereof has negative charge and is hydrophilic, the compound is water-soluble. Therefore, the compound has insufficient fastness to light, humidity and heat when it is used as a colorant. Therefore, in order to use an oxonol compound as a fast colorant, it has been desired to develop an oxonol compound capable of realizing a preferable hue, when it is used as a colorant in the recording liquid, and having high fastness to light, humidity and heat.
European patent Nos. 778,493 and 822,444, and JPA No. 6-332112 disclose an association product of an oxonol compound used as a filter dyestuff of a photographic system. Moreover, U.S. Pat. No. 5,965,333 discloses a heat-sensitive recording material containing an aggregate of an oxonol compound. However, until now, there has been no ink jet ink containing an aggregate of an oxonol compound.
On the other hand, there have been known lake pigments which was obtained by making a water-soluble colorant having a carboxyl group or a sulfo group into an insoluble metal salt having a valency of 2 or more, as means for making a water-soluble colorant fast. For example, there are descriptions regarding lake pigments using calcium, barium, strontium and aluminium as a metal cation in “Industrial Organic Pigments, Second Completely Revised Edition” (W. Herbst, K. Hunger, VCH, 1997) pp. 315 to 345. However, these pigments are not sufficient in hue and light-resistance, and further improvements have been desired.
Further, materials for forming a color image in particular have been mainly used as image recording materials in recent years. Specifically, there are vigorously utilized an ink jet recording material, a thermal transcription type image recording material, a recording material using electrophotography, a transcription type silver halide photosensitive material, a printing ink, a recording pen and the like. Further, a color filter is used in LCD and PDP for displays, and an image pickup device such as CCD or the like for photography instruments.
Colorants (dye and pigment) having the so-called three primary colors for an additive process and a subtractive process are used in these color image recording material and color filter in order to reproduce or record a full color image, but with the status quo there is no fast colorant whose absorption property allows it to obtain a reproducing region having a favorable color, and which is capable of enduring various conditions during use. Thus improvements are strongly desired.
Since material cost is cheap, high speed recording is possible, noise at recording is little, and color recording is further easy in an ink jet recording method, it is being rapidly spread and further developed.
There are a continuous system by which drops of a liquid are continuously flown, and a on-demand system by which drops of a liquid are flown in accordance with image information signals in the ink jet recording method. As discharging systems thereof, there are a system of discharging drops of a liquid by adding pressure by a piezo device, a system of generating foams in an ink by heat and discharging drops of a liquid, a system using ultrasonic, or a system of inhaling and discharging drops of a liquid by static electricity. Further, as an ink for ink jet recording, an aqueous ink, an oleaginous ink, or a solid (melt type) ink is used.
It is required for a colorant used for the ink for ink jet recording that solubility or dispersiveness in a solvent is good, high density recording is possible, hue is good, it is fast to light, heat, and active gases (So
x
and the like in addition to oxidative gases such as No
x
, ozone, and the like) in environment, fastness to water and chemicals is excellent, fixation property to a image-receiving material is good and it is not easily soaked, preservation property as an ink is excellent, it has no toxicity, purity is high, and further, it can be obtained at low cost.
However, it is extremely difficult to find a colorant which satisfies these demands at a high level. Particularly, a colorant having good magenta or cyan hue and being fast to light, active gases in an atmosphere, particularly, oxidative gases such as ozone and the like is highly desired.
SUMMARY OF THE INVENTION
The object of the present invention is to solve the above-described problems and provide a recording liquid for ink jet containing a solid fine particle dispersion of a methine compound having good hue and simultaneously excellent fastness to light, humidity, heat, and oxidative gases, and an ink jet recording method according to said recording liquid.
Another object of the present invention is to provide a methine compound which has good hue and a cation having a valency of 2 or more as a counter cation.
The above object of the present invention can be achieved by a recording liquid for ink jet containing a solid fine particle dispersion obtained by dispersing in a medium a compound represented by the general formula (I) or (II):
wherein each of A and B represents an atomic group required to complete a conjugated double bond chain, and each of Y and Z represents an atomic group required to form a carbocyclic ring or heterocyclic ring; each of L
1
, L
2
, L
3
, L
4
and L
5
represents a methine group which may be substituted, and each of X and X′ represents an oxygen atom, a sulfur atom or —C(CN)
2
; each of m1 and n1 represents 0, 1 or 2, and each of x and y represents 0 or 1; M
k+
represents a k-valent cation, k represents an integer of 1 or more, and n represents a figure required to equalize the positive charge number with the negative charge number in the general formula (I).
wherein each of L
1
, L
2
, L
3
, L
4
and L
5
represents a methine group which may be substituted, each of P, P′, Q, and Q′ represents a substituted group, and each of X and X′ represents an oxygen atom, a sulfur atom or —C(CN)
2
. Each of m1 and n1 represents 0, 1 or 2; M
k+
represents a k-valent cation, k represents an integer of 1 or more, and n represents a figure required to equalize the positive charge number with the negative charge number in the general formula (II).
Another aspect of the present invention is a methine compound represented by the general formula (III) or (IV):
wherein each of A and B represents an atomic group required to complete a conjugated double bond chain, and each of Y and Z represents an atomic group required to form a carbocyclic ring or heterocyclic ring; each of L
1
, L
2
, L
3
, L
4
and L
5
represents a methine group which may be su
Noro Masaki
Yabuki Yoshiharu
Yamada Makoto
Burns Doane , Swecker, Mathis LLP
Fuji Photo Film Co. , Ltd.
Klemanski Helene
LandOfFree
Methine compound, a recording liquid for ink jet, and an ink... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Methine compound, a recording liquid for ink jet, and an ink..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methine compound, a recording liquid for ink jet, and an ink... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3278953