JPS58183769A - Ink for ink jet recording - Google Patents

Abstract

PURPOSE:An ink for jet recording, containing an N-alkanolamine salt of m-di- gallic acid as an additive, and capable of improving the water resistance of a dyed material without deteriorating the solubility of a dye. CONSTITUTION:An ink for jet recording containing an N-alkanolamine salt of m- di-gallic acid expressed by formula I [R1 and R2 are H or (hydroxy)alkyl; R3 is H or 1-4C alkyl], e.g. a compound expressed by formula II, as an additive in an amount of preferably 0.5-20wt% in an ink composition consisting of a water-soluble dye, e.g. a direct dye or acid dye, a wetting agent, preservative and water, etc. EFFECT:Improved stability for a long term.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inkjet recording ink. Sara V
(Regarding novel additives used in aqueous ink compositions.

Conventionally, water-soluble dyes such as acid dyes or direct dyes have been used as colorants in aqueous ink compositions, but since the colorant is a dye, the problem inevitably arises that the coloring comes off due to water. For this reason, it is common practice to add splintability improvers to improve the water resistance of dyed products.

Polyethyleneimine is known as a improver for this keyaki, but the azo chain in the structure of the dye causes a reduction effect in an aqueous solution by the primary amine group of the polyethyleneimine molecule, resulting in a decrease in the dyeing power of the dye. There was a problem in that dye precipitation and insoluble matters were likely to occur.

Therefore, the present inventors conducted intensive research in view of the above problems, and came to the conclusion that the above problems could be solved by using N-alkanolamine salts of m-G erosion and child acids as additives, and the present invention The child was born.

The object of the present invention is to improve the water resistance of dyed products without reducing the solubility of dyes.

Another object of the present invention is to stabilize the ink liquid over a long period of time.

In order to achieve the above object, the present invention provides an aqueous ink composition containing the general formula (wherein R1 and R1) as additives.
2 represents hydrogen, alkyl)/- or a hydroxyargyl group, respectively, and T (, i1 represents hydrogen or an alkyl group having 1 to 4 carbon atoms) N- of m-di-gallic acid; Use alkanolamine/salt.

m-di of the above general formula used in the present invention is shown below.

The ratio of N-alkanolamine/salt of m-G gallic acid used in the present invention is preferably from 11 to 501-h, more preferably 0.5-h based on the total weight of the inkjet recording ink. ~20% by weight. Also,'
Although the N-alkanolamine salt of m-G gallic acid can be used alone to achieve the purpose of the present invention,
Preferably used in combination with alkanolamines.

As colorants, water-soluble dyes such as direct dyes and acid dyes can be used. Representative examples of these dyes are shown below.

Direct Dye C, 1, Tie Left Yellow 1.8.11.12.24.26.27.33.59.
44.50,5B, 85.86.88.98.100.
110°C, 1, Direct Red 1.2.4.9.11.13.17.2 [], 25.2
4.28.31.33.37.39.44.62.81
．． 85.99.227゜(ゝ 1.A Direct Blue 1.2.6.8.15.22.25.71.76.78
．． 86.98, 108, 120.192, 193.19
4195.196.199.200.201.202.
205.207.236.237°C21, Direct Black 2.4.17.19.22.32.38.51.56.
62.71.74.75.77.105.108.11
2.154° Acid Dye C11, Acid Yellow 7.17.25.29.42.99°C91, Acid Red 56.64°C:, 1. Acid Red 18.87.92.94°C, 1, Acid Blue 1.7,? , 264.236°1'), I,
Anrad Green 12.19.27.41゜(,■
Acid Black 1.2.7.24.94゜The proportion of colorant used in the present invention is α based on the ink shoe xm.
A range of 5 to 15 double weights is preferred.

Furthermore, other constituent components of the inkjet recording ink of the present invention include water, wetting agents, preservatives, and the like.

Hereinafter, the present invention will be further explained with reference to Examples, but the present invention is not limited thereto. In addition, the example defamation is weight%
Indicated by

Example 1 C,1, Acid Blue 9 (manufactured by Orient Chemical Co., Ltd.) 6.6% Ethylene glycol 14%
Triethanolamine 1
11-oxane 0
．． 4thi ion exchange water 751
The above composition was stirred continuously for 3 hours while heated at 70°C to sufficiently dissolve it, and then filtered twice through a membrane filter with an opening diameter of 0.45 μm to prepare an ink.

The physical properties of the ink were as follows.

Surface tension 1゜-62dyne/cm Viscosity
Required η -1,9 cp pH 9,5 Next, various tests were conducted using the ink subjected to ms as described above.

(1) Image clarity and image drying inner diameter 30 μm
When the ink was jet-recorded from the nozzle on commercially available high-quality paper at a particle formation frequency of 100 KHz, a clear image was obtained. The drying time of the recorded matter was within 10 seconds at room temperature and humidity.

(2) Seal the preservative ink in a glass container and store at -20°C for 1 month, 4
Although it was stored for 1 month at 20°C, 1 year at 20°C, and 1 week at 90°C, no precipitation was observed. Further, no change was observed in the physical properties of the ink or the color image.

(i) Jetting Stability The jet recording described in (1) above was performed continuously for 1000 hours, and stable recording was achieved without any clogging of the nozzle or change in the jetting direction.

(4) Injection response After recording the jet according to (1) above, leave the jet at room temperature and humidity for one month and at 40℃-30°C for one week, then repeat the jet recording in (1). I recorded it, and as with the 11th century (5), I was able to make stable records.

(5) Image fastness test Water resistance test - Immersed in cold water for 10 minutes, and the reflection density change rate at that time was 82%.

Light resistance test: After 2 hours of light irradiation with a Suga Seiki fade meter, the rate of change in reflected color density was 83 degrees.

Example 2 C, L Direct Blue 86 (manufactured by Orient Chemical Co., Ltd.) 5.5% Glycerin 6%
Diethylene glycol 13
% triethanolamine
1.0% Sodium 2-pyridinethiol-1-A oxide 0
5% ion exchange water 70%
An ink liquid was prepared in the same manner as in Example 1 using the seven-part composition, and tests (1) to (4) were conducted in the same manner as in Example 1, with good results.

The results of the test (5) were as follows.

Water resistance 79 Light resistance 71 Excellent example 3 c, r, -r Gitlet 94
4. Os diethylene glycol
17 Triethanolamine
[L6p-hydroxybenzoic acid butyl ester (J, 4% ion-exchanged water
Ink 'e' was manufactured by FA in the same manner as in Example 1 using the composition No. 7111F, and tests (1) to (4) were conducted in the same manner as in Example 1, with good results.

The results of the test (5) were as follows.

Water resistance: 81% Light resistance: 75% Furthermore, when inks were prepared and tested in the same manner as in the above examples using other additives and dyes used in the present invention, the results were similar to those in the above fruitful examples. Good results were obtained.

Comparative Example 1 An ink was prepared using the same composition as in Example 1 except that the additive of the present invention was not used, and tests were conducted in the same manner as in Example 1. Tests (1) to (4) ), good results were obtained in Test (5) VC, but as shown below, satisfactory results were not obtained. Water resistance 59 points,
Light resistance 53%.

Comparative Example 2 Example 2 and l'm except that the additive of the present invention was not used.
An ink was prepared using the same 111 composition as Example 1.
When a test was conducted in the same manner as in Test (4), regarding the jetting response, the Xun inkjet produced unstable recording for 2 seconds during jetting without being allowed to stand. Regarding test (5), satisfactory results were not obtained as shown below. Water resistance 62
H, light resistance 61mm.

Claims (1)

[Claims] General formula (wherein R1 and R2 each represent hydrogen, an alkyl group or a hydroxyalkyl group, and RS represents hydrogen and an alkyl group having 1 to 4 returning atoms) An ink for inkjet recording, characterized in that it contains an N-1 lucanolamine salt of m-G gallic acid as an additive.