JPH04213374A - Recording fluid for ink jet printer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording liquid using pigments suitable for ink jet recording.

0002

2. Description of the Related Art The inkjet recording method is characterized by low noise, low running costs, and easy color printing, and has become rapidly popular in recent years. Colorants for recording liquid used in inkjet recording include:
Usually, water-soluble dyes such as acid dyes and direct dyes are used, but they are not sufficient in terms of fastness such as light resistance and water resistance, and improvements are being considered. In order to improve the light resistance and water resistance of water-soluble dyes, for example, JP-A No. 64-62372,
Many proposals have been made, as described in JP-A-64-48873, JP-A-64-16880, JP-A-63-289079, etc., but they are still insufficient.

On the other hand, methods of using pigments as coloring agents have been studied for a long time, for example, in Japanese Patent Application Laid-Open No. 12104-1983.
No., JP-A-56-147859, JP-A-56-147
No. 863, JP-A-56-147869, JP-A-56-
No. 157468, JP-A-57-21466, JP-A-6
Many applications such as No. 2-74973 have been filed. When a pigment is used as a coloring agent, the light fastness and water resistance are significantly improved compared to dyes, but it has not been put into practical use because of poor storage stability as a recording liquid.

0004

[Problems to be Solved by the Invention] An object of the present invention is to provide an inkjet recording liquid which has high light resistance and water resistance of recorded images, and which has excellent storage stability and ejection stability as a recording liquid. This is based on the new finding that this objective can be achieved by using a specific dispersant.

[0005]

[Means for Solving the Problems] The gist of the present invention is to provide an aqueous medium, a pigment, and the general formula [I], [
II] An inkjet recording liquid containing at least one of the compounds represented by [III] and [IV]. The present invention will be explained in detail below. The general formula [I],
In [II], [III] and [IV], R1
, R2, R3 and R4 may be linear or branched, and in the case of alkenyl groups, the position of the double bond is not limited.

In the recording liquid of the present invention, as the pigment, azo type, phthalocyanine type, quinacridone type, and carbon black can be used.
Yellow-74, -154, Pigment
Red-5, -122, Pigment Blue-
15 is preferred. The content of the pigment is in the range of 0.5 to 10 wt%, preferably 1 wt% based on the total weight of the recording liquid.
-7wt% range is mentioned.

In addition to water, examples of the aqueous medium used in the recording liquid of the present invention include water-soluble organic solvents such as ethylene glycol, propylene glycol, butylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, (#200), and polyethylene glycol. , (#400), glycerin, N-methyl-pyrrolidone, N-ethyl-pyrrolidone, N-vinyl-pyrrolidone, 1,3-dimethyl-imidazolidine, ethylene glycol monoallyl ether, ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, etc. The content of the water-soluble organic solvent is preferably in the range of 0 to 50% by weight based on the total amount of the recording liquid.

Examples of the compound of the general formula [I] used as a dispersant in the recording liquid of the present invention include No.
．． I-1 CH2
-CONHC18H37
｜
NaO3 S-CH-COONa
No. I-2
CH2-CONHC12H25
｜
NaO3 S-CH
-COONa




No
．． I-3 CH-C
ONHC17H35
｜
NH4 O3 S-CH-COONH4
No. I-4
CH2-CONHC18H35
｜
NaO3 S-CH
-COONa No. I-5
CH2 CONHC11H21

｜NH4O3
S-CHCOONH4 Examples of the compound of the above general formula [II] include: Examples of the compound of the above general formula [III] include. As the compound of the general formula [IV], No. IV-1
CH2 COOC8 H17

｜NaO3
S-CHCOOC8 H17 No. IV-
2 CH2 COOC
11H21
｜
NaO3 S-CHCOOC11H21
No. IV-3
CH2 COOC9 H17
｜
H4 NO3 S-CHCOOC
9 H17 No. IV-4
CH2 COOC11H21

｜NaO3
Examples include S-CHCOOC6 H13.

[0009] As such a compound, Rapizol B-
80 (manufactured by Nippon Oil & Fats Co., Ltd.), Diaserver PN-19
70J (manufactured by Hoechst) and the like are commercially available, and these can also be used as appropriate. In the recording liquid of the present invention,
The content of these dispersants may range from 30 to 100% by weight, preferably from 30 to 70% by weight, based on the weight of the pigment, either alone or in combination. These dispersants may be used alone in the same general formula, but
Further effects can be obtained by using them together. Furthermore, by adding 0.5 to 20% by weight of a surfactant to the recording liquid of the present invention, quick drying properties and print quality after printing can be improved. Further, the recording liquid of the present invention may contain urea,
Discharge stability can be further improved by adding caprolactam.

0010

Effects of the Invention The recording liquid of the present invention is used for ink jet recording, and not only does the recorded image have excellent light resistance and water resistance, but also the storage stability and ejection stability of the recording liquid are extremely good.

[0011]

EXAMPLES The present invention will be explained in more detail with reference to the following examples, but the present invention is not limited to these examples in any way. Example 1 Composition of recording liquid
Usage amount (g)
Polyethylene glycol (#200)
15 No. Compound I-1

1.5 Pigment R
ed 122
4 Water

Remaining amount total

100 Take each of the above ingredients in a container and average 0.
Grinding was performed for 20 hours using a sand grinder (manufactured by Igarashi Kikai Seizo Co., Ltd.) together with 130 ml of glass beads having a diameter of 5 mm. After pressure filtration using a Teflon filter with a pore size of 3 μm, deaeration treatment was performed using a vacuum pump and an ultrasonic cleaner to prepare a recording liquid. Using the obtained recording liquid, inkjet recording was performed on electrophotographic paper (manufactured by Fuji Xerox Co., Ltd.) using an inkjet printer (IO-735, manufactured by Sharp Corporation), and the following (a)
), (b) and (c), various evaluations were performed. (a) Light resistance of recorded images There was little discoloration or fading after the printed matter was irradiated for 100 hours using a xenon fade meter (manufactured by Suga Test Instruments Co., Ltd.). (b) Storage stability Even after the recording liquid was sealed in a Teflon container and stored at 60° C. for 2 months, no gelation occurred and no sediment was observed. (c) Ejection stability Continuous ejection was performed for 48 hours at room temperature, and stable high-quality recording was achieved from beginning to end.

Comparative Example 1 No. 1 in Example 1. A recording liquid was prepared using Diskol 30 (trade name, manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.), which is a naphthalene sulfonic acid formalin condensate dispersant, in place of the compound I-1, and the same procedure as in Example 1 was carried out. As a result of evaluation, sediments were formed after 3 days at 60°C, and discharging became impossible after 15 hours when continuously discharging at room temperature. Comparative Example 2 No. 2 in Example 1 A recording liquid was prepared using Pronone-204 (trade name, manufactured by NOF Corporation), which is an oxyethylene/oxypropylene block polymer type dispersant, in place of the compound I-1, and the same evaluation as in Example 1 was conducted. As a result, sediments were formed after 7 days at 60°C, and continuous discharge at room temperature became impossible after 20 hours.

Example 2 Composition of recording liquid
Usage amount (g)
diethylene glycol
20 No. I
Compound I-3
1 Pigme
nt Blue 15
3 Water

Remaining amount total

100 Using the above composition, a recording liquid was prepared in the same manner as in Example 1, and (a), (b), (
The results of various evaluations in c) were all favorable.

Comparative Example 3 No. 3 in Example 2 II-
Polynas PS-1 (manufactured by Toyo Soda Kogyo Co., Ltd.), which is a polystyrene sulfonate sodium dispersant, was used instead of compound 3.
A recording liquid was prepared using the same method, and the same evaluation as in Example 1 was performed. As a result, sediment was formed after 4 days at 60°C, and ejection became impossible after 13 hours when continuous ejection was performed at room temperature.

Example 3 Composition of recording liquid
Usage amount (g)
No. Compound I-2
0.5
No. Compound II-1
0.
5 Glycerin
10
Pigment Yellow-74
2 water

Remaining amount
total
100 Example 4 Composition of recording liquid
Usage amount (g)
No. Compound I-3
0.5
No. Compound II-3
1.
0 No. Compound III-3
1
．． 5 Carbon black
6
ε-caprolactam
5 Water

Remaining amount
total
100 Using the ink compositions of Examples 3 and 4 above, recording liquids were prepared in the same manner as in Example 1, and various evaluations were performed. As a result, all were good as in Example 1. Example 5
Composition of recording liquid
Amount used (g) Glycerin
15 No.
Compound IV-1
1.0
Pigment Yellow-74
2 water

Remaining amount
total
100 Place each of the above ingredients in a container and add 130 ml of glass beads with an average diameter of 0.5 mm.
Sand glider (manufactured by Igarashi Kikai Seizo Co., Ltd.)
Grinding treatment was carried out for 20 hours using. After pressure filtration using a Teflon filter with a pore size of 3 μm, deaeration treatment was performed using a vacuum pump and an ultrasonic cleaner to prepare a recording liquid. Using the obtained recording liquid, an inkjet printer (IO-
Inkjet recording was performed on electrophotographic paper (manufactured by Fuji Xerox Co., Ltd.) using an inkjet paper (manufactured by Fuji Xerox Co., Ltd.) using an inkjet paper (manufactured by Fuji Xerox Co., Ltd.), and various evaluations were performed according to the methods (a), (b), and (c) below. (a) Light resistance of recorded images There was little discoloration or fading after the printed matter was irradiated for 100 hours using a xenon fade meter (manufactured by Suga Test Instruments Co., Ltd.). (b) Storage stability Even after the recording liquid was sealed in a Teflon container and stored at 60° C. for 2 months, no gelation occurred and no sediment was observed. (c) Ejection stability Although continuous ejection was performed for 48 hours at room temperature, stable high-quality recording was possible from beginning to end.

Comparative Example 3 No. 3 in Example 5 A recording liquid was prepared using Diskol 30 (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), which is a naphthalene sulfonic acid formalin condensate dispersant, in place of the compound IV-1, and the same evaluation as in Example 1 was performed. As a result, 60
Sedimentation occurs after 3 days at ℃, and 15℃ during continuous discharge at room temperature.
It became impossible to eject after a while. Comparative Example 4 No. 4 in Example 5 Results of preparing a recording liquid using Pronone 204 (manufactured by NOF Corporation), which is an oxyethylene/oxypropylene block polymer type dispersant, in place of the compound IV-1, and conducting the same evaluation as in Example 1. , a sediment was formed after 7 days at 60°C, and it became impossible to discharge after 20 hours of continuous discharge at room temperature.

Example 6 Composition of recording liquid
Usage amount (g)
diethylene glycol
20 No.
．． Compound IV-3
1 P
igment Blue 15
3 Water

Remaining amount
total
100 Using the above composition, a recording liquid was prepared in the same manner as in Example 1, and (a)
, (b), and (c), all of them were good.

Example 7 Composition of recording liquid
Usage amount (g)
No. Compound IV-2
1.
0 No. Compound IV-4
1
．． 0 Polyethylene glycol (#200)
15 Pigment
Red-5
4 Water

Remaining amount total

100 Using the above composition, a recording liquid was prepared in the same manner as in Example 1, and as a result of various evaluations, all results were good as in Example 1.

Claims (1)

[Claims] Claim 1: An aqueous medium, a pigment and the following general formula [I
], [II], [III] and [IV]. CH2-CONHR1
｜

...[I] MO3 S-CH-COOM CH2 -CONHR2
｜

…[II] MO3 S-CH-CONHR2
CH2-COOR3
｜
…[I
II] MO3 S-CH-COOM CH2 COOR4
｜
… [
IV] MO3 S-CHCOOR4 (In each formula, R1 and R3 represent an alkyl group or an alkenyl group having 10 to 20 carbon atoms, and R2 and R4
represents an alkyl group or alkenyl group having 6 to 16 carbon atoms, and M represents Na or NH4. )