Compositions: coating or plastic – Coating or plastic compositions – Marking
Reexamination Certificate
2002-03-21
2004-11-02
Klemanski, Helene (Department: 1755)
Compositions: coating or plastic
Coating or plastic compositions
Marking
C106S031470, C106S031490, C106S031430, C106S031760, C106S031770, C106S031780, C106S031790, C428S032100, C347S100000, C283S045000
Reexamination Certificate
active
06811597
ABSTRACT:
TECHNICAL FIELD
The present invention relates to an ink composition, recording medium, inkjet recording method, and recording, and more particularly to an ink composition, recording medium, and inkjet recording method that can obtain high quality images, and that have a recording with superior light stability (light resistance), ink that does not clog, and a recording with superior yellowing resistance.
BACKGROUND ART
Inkjet recording is a printing method that records by releasing droplets of an ink composition, and allows them to affix to a recording medium such as paper. This method is capable of printing high resolution, high quality images at high speed using comparatively inexpensive equipment.
A great variety of ink compositions have long been offered for use in this kind of inkjet recording.
Recently, there has been heightening demand to improve the weather resistance (particularly the light resistance) of the recorded image. The technique to achieve this end has been to include light stabilizers such as hindered amine group compositions to the ink composition.
For example, described in Dyes and Pigments 19 (Dyes and Pigments 19, 1992, 235-247) is the ability to prevent the light degradation of dyes by adding 2,2,6,6-tetramethyl-4-hydroxypiperidene-1-oxyl, which is a hindered amine group light stabilizer, to an aqueous solution containing said dye. Moreover, disclosed in Japan Unexamined Patent Disclosure No. Hei 11-170686, which was submitted after publication of the aforementioned cited literature (Dyes and Pigments 19), is technology that strives to stabilize said water soluble dye by adding a specific compound (the aforementioned 2,2,6,6-tetramethyl-4-hydroxypiperidene-1-oxyl or derivatives thereof). Said compound works to prevent light degradation by stopping the progress of the photo-oxide reaction of the pigment based on capturing radicals such as the R produced by photo-excitation of carbonyl compounds, etc. (alkyl radical) and the ROO produced by the reaction of R with the oxygen present in air (peroxide radical). The print recorded by the ink jet method using the above recording solution has superior light resistance.
Nonetheless, while the light resistance of the recorded image is improved by recording using an ink composition that contains the aforementioned light stabilizer, the new problem emerges that the recording yellows based on the affect of the light stabilizer when the recording is stored in a file composed of a film comprising oxidation preventatives consisting in specific phenol group derivatives, and when the applicable film is affixed to the recording.
This appears to be caused by a reaction of the specific phenol group derivatives based on the action of the light stabilizer, such as a hindered amine group compound contained within the ink composition adhering to the recording medium. BHT (2,6-di-t-butyl-4-methyl phenol), etc. are specific phenol group derivatives.
Specifically, the aforementioned phenol group derivatives contained in the film move from the film to the recording because they have sublimability, and it appears that the reactant produced through dimerization and a quinone reaction causes the recording to yellow based on the action of the light stabilizer in the recording. It appears that, if the light stabilizer has an oxy radical in particular, yellowing is produced all the more because the reaction is notably promoted.
In addition, even if a light stabilizer compound does not have an oxy radical, the yellowing reaction quietly progresses during the process of storing the recording in contact with air, and yellowing of the recording is still generated because oxy radicals are produced in the light stabilizer by oxidation reactions.
Consequently, an object of the present invention is to provide an ink composition, recording medium, inkjet recording method, and recording that can obtain high quality images with hardly any yellowing, and that have a recording with superior light resistance, and ink that does not clog.
DISCLOSURE OF THE INVENTION
As a result of painstaking inquiry, the present inventors discovered that a recording with superior light resistance, anti-clogging characteristics, and yellowing resistance could be obtained by configuring an ink composition to comprise a colorant, water, a compound expressed by the aforementioned general formula (1), and a hydrazide group compound.
The hydrazide compound in the present invention has a —CXNHNR
8
R
9
group (R
8
and R
9
are hydrogen, an alkyl group, or an aryl group; X is S or O) or a —SO
2
NHNR
8
R
9
group (R
8
and R
9
are hydrogen, an alkyl group, or an aryl group), obtained by a condensation reaction of hydrazine compounds expressed by the general formula NH
2
NR
8
R
9
(R
8
and R
9
are hydrogen, an alkyl group, or an aryl group) with: a related acid derivative such as an ester of carbonate, acid halide, or thiocarbonate; a sulfonate derivative such as sulfonate, or chlorosulfonate; or isocyanate or diisocyanate.
In addition, the present inventors discovered that a recording with superior light resistance and yellowing resistance could be obtained by providing a recording medium with a receiving layer, and by said receiving layer comprising a compound expressed by aforementioned general formula (1), and a hydrazide group compound.
The present invention is based on the aforementioned discovery; offers an ink composition that comprises a compound expressed by aforementioned general formula (1) and a hydrazide group compound; and offers a recording medium that has a receiving layer comprising a compound expressed by aforementioned general formula (1), and a hydrazide group compound. The present invention further offers a recording and a recording method obtained by using these ink compositions and/or recording media.
In the above, the compound expressed by general formula (1) preferably has a water soluble group W (W expresses a hydroxide group, —SO
3
H group, sulfate ester group, —P(O)(OH)(OR), —P(O)(OR)
2
, carboxyl group, amino group, carbamoyl group, or the salts thereof, phenolic hydroxide group salts, polyethylene glycol ether group, —C═NH(NH
2
) salts, or —NHC═NH(NH
2
) salts (R is an alkyl group or an aryl group.)).
In the above, the hydrazide group compound is preferably a compound expressed by general formula R
5
CXNHNR
6
R
7
(R
5
is an alkyl group or an aryl group; R
6
and R
7
are hydrogen, an alkyl group, or an aryl group; and X is S or O), general formula R
5
SO
2
NHNR
6
R
7
(R
5
is an alkyl group or an aryl group; and R
6
and R
7
are hydrogen, an alkyl group, or an aryl group), or general formula R
5
NHCXNHNR
6
R
7
(R
5
is an alkyl group or an aryl group; R
6
and R
7
are hydrogen, an alkyl group, or an aryl group; and X is S or O).
In the aforementioned hydrazide group compound, there may be two or more hydrazide structures in the same molecule.
In the compound expressed by the aforementioned general formula (1), Z is preferably a non-metallic atom group necessary to complete a six member ring.
In the compound expressed by the aforementioned general formula (1), X is preferably an oxy radical group.
The compound expressed by the aforementioned general formula (1) preferably comprises 0.05 wt % or more to 10 wt % or less of the ink composition.
The aforementioned hydrazide group compound preferably comprises 0.01 wt % or more to 10 wt % or less of the ink composition.
In the above, the weight ratio of the compound expressed by the aforementioned general formula (1) to the aforementioned hydrazide group compound is preferably 1:25 or more to 5:1 or less (former/latter).
The aforementioned ink composition may also comprise a penetrating agent and/or a moisturizing agent.
According to the aforementioned configuration, it is possible to obtain a recording with superior light resistance as well as superior yellowing resistance because the dimerization and quinone production of the phenol group derivatives can be prevented.
In the aforementioned recording medium of the present invention, it is preferable that the compound expressed by the
Aoyama Tetsuya
Ito Yuji
Kitamura Kazuhiko
Oka Kyoichi
Oki Yasuhiro
Klemanski Helene
Ladas & Parry
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