JPS58164665A - Water-based ink for ink jet printer - Google Patents

Abstract

PURPOSE:To prevent a nozzle from clogging, by incorporating a water-soluble phthalimide, prepared by the addn. of ethylene oxide alone or together with propylene oxide to phthalimide, in a water-based ink for ink jet printers. CONSTITUTION:Ethylene oxide alone or together with propylene oxide is added to phthalimide to obtain a water-soluble phthalimide deriv. of the formula (wherein m is 0.1-2; n is 1-13). Using 0.01-20wt% phthalimide deriv. as a dye solubilizer, a water-soluble dye such as direct dye, acid dye, disperse dye, etc. (e.g., C.I. direct yellow 8, C.I. direct red 4), water, necessary additives, and the like are mixed together to yield the intended water-based ink for ink jet printers. The resulting ink prevents nozzles from clogging caused by evaporation of water out of ink, variation in ambient temperatures, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an aqueous ink for inkjet printers that has excellent screen stability.

The inkjet recording method ejects ink droplets in a spiral manner from a nozzle with a small orifice diameter of 10 to 400μ.
Since it is a method of performing κW characters on the top of the rope, it is possible to record one record with low noise and high decipherability. 1! κ is also easy to colorize.

Although this recording method has such advantages, the nozzle used in this recording method is thin, so it is prone to clogging, and the reliability is severely degraded.

Nozzle clogging is likely to occur when the water in the ink emits S, and it is often prevented from drying by cooling the humectant in the ink. Yes. Generally towards the nozzle end when the printer is stopped! Although it is possible to prevent W clogging by sufficiently preventing the ink from drying by installing a Ya, 5
When exposed to a temperature of 11 mKtlk at a low temperature of 1 to 2 degrees Celsius, there were cases in which problems occurred in pasting after 1 to 2 cycles, even though water evaporation was unlikely.

Since the cause of clogging is the lack of solubility of the dye in water, the addition of dye solubilizing copper or dye 1ri dissolving agent has been recommended as a preventive measure against the problem. Ethyleneridone and its conductors, tetrahydrofurfural alcohol, 4-methoxy-4-methylpentan-2one, ethylene oxide adducts of p-toluenesulfonamide, thiogentanol, alkanolamines, and various other additives are known. However, the dissolution stability of dyes due to their addition is not necessarily sufficient.

Therefore, an object of the present invention is to provide an ink for inkjet recording that prevents nozzle clogging caused by factors such as evaporation of water in the ink and changes in environmental temperature.

The present invention provides, as such an ink, a water-based ink for inkjet printers containing water, a water-based dye, and a water-soluble phthalimide compound obtained by adding ethylene oxide or ethylene oxide and propylene oxide to phthalimide. It is something.

The phthalimide derivative used in the present invention has a general formula in which m is 0 or 1 to 2! ia, n4 is an integer from 1 to 13.

A water-soluble phthalimide derivative represented by is suitable.

The derivative of formula (1) tends to have poor foaming properties as n increases, so when n is 5 or more, m is 1 to 1.
6 is even more preferable. On the other hand, when n is 5 or less, it is more preferable that m is 0 or 1, since water bathing properties tend to weaken as the strength decreases. Forging is m
is 1, and n is 5 to 9. In this case, the ink has excellent stability and its foaming property is very high.
A stable jet of ink is a tool. Furthermore, if the printing drying time is shortened, iJa can provide excellent quality printing with less &C stains.

The content of the above-mentioned phthalimide derivative can be set to 1 to 20 liters of the total amount of ink depending on the type of dye used and the viscosity of the ink passed through the recording head, but it is usually 1 to 5 liters by weight of the total ink. suitable.

The water-based dye used in the present invention is a water-bathable direct dye.

C, 1, Direct Yellow 8.12.26.28.
44.50.86.98.142; C, 1, Acid Yellow 7.19.26.38.4
4.61.110.141.196; C, 1, Paysic Yellow 4.11.13.15.
21.28.32.51; C, 1, Deisno ζ-suie o-5, 51, 60, 64
, 76, 88, 186, 192; C, 1, Reactive Yellow 13.14.75.7
9, 114.115.116; C, 1, Direct Red 4.9.16.26.51
．． 79.81.86.240.241; C, 1, Acid Red 1.6.14.35.52.
88.111.151.249.274; C, 1, Paysic Red 14.15.18.27.
46:1.39:1.82.95; C, 1, Te 4 Hearth L/7)" 45.54.6
o, 65.75.88.92.135.189.19o
.

191.205.288.296; C, 1, Reactive L/7 Do 22.23.108.
109.11o.

111.114; C, 1, Direct Blue 1.2.15.22.25
．． 71.86.90.98.192; i C,1,7-/Radbruch, 40,62.78.85
, 92.112.126.129; C, 1, Paysic Blue 1.3.5.7.9.24
．． 25.26.28.47.129.165. 157; C, 1, Disperse Blue 26.54.56.60
．． 76.81.169.146.257.301; C, 1, rear knife pull-5, 15, 19, 21, 4
9,100°147.148; C01, Direct Pull-17,19,22,32,5
8,51,62,107,112,132,154;C
,1, Acid Blue 1.2.24.31.52.
58.60.107.109.155; C, 1, Paysic Black 2; , Su, 1. , :, ) C, 1, Disperse Black 1; ゛・□ -1... C, 1, Reactive Black 5
1, etc., but the dyes are not necessarily limited to these dyes.

These dyes can be used alone or in a mixture of two or more.

The ink according to the present invention may contain the above-mentioned components, and may further include a wetting agent, a pH 1#11 moderating agent, a sequestering agent, an antifungal agent, other dye dissolution aids, a water-bathable binder resin, etc. can contain.

Wetting agents that can be used as necessary in the present invention include ethylene glycol, diethylene glycol, glycerin, triethylene glycol, tetraethylene glycol, and polyethylene glycol + 200.600.4
00.600, polyalcohols such as polypropylene glycol; pyrrolidones such as N-vinylpyrrolidone, N-methylpyrrolidone, β-hydroxyethylpyrrolidone: monoethanolamine, jetanolamine, triethanolamine, N,N-dimethyl Ethanolamine 7, N, N-diethylethanolamine, N-methylgetanolamine, N-ethylgetanolamine, N
- amino alcohols such as propylgetanolamine, N-butylgetanolamine; formamide;
Amides such as N,N-dimethylformamide and N,N-dimethylacetamide may be mentioned.

pH1ll that can be used depending on the need for unconsciousness! Examples of 1-blocking agents include sodium Rr11, sodium borate, sodium Mizuki, and sodium chloride; examples of koji-chaining agents include EDT, glyconic acid sodium salt, or potassium salt; antiseptics include tehydro-11m. Sodium, 2
, 4.6-) lychlorphenol, dioxin, and sodium omadine.

Next, we will concretely explain the book: @ Ming by comparing the *1 example and the comparative example.

Examples 1 to 6 The components of each formulation shown in Table 1 were mixed, thoroughly stirred, and then filtered with a 15μ ball filter to remove the ink.
It was 11i.

The IiI'N6 stability and rejetting properties of each ink were repeatedly tested and the results are listed in Table 1.

Solution stability - ink was sealed in four Pyrex test tubes,
Precipitated at 5℃ and 50℃ after 14 days of electric discharge in the armpit.
Whether or not this occurs - Peta.

The amount of precipitation was expressed as follows.

O No precipitates at all 0 I don't know 〃 A small amount × 〃 A large amount Tan Ejectability Pour ink into the ink tank of an inkjet iron koji that has a glass nozzle with a single hole of 30 μm, eject once, then stop ejecting. However, the tumor remained as it was for 5 and 7 days.
After being left at room temperature for 14 days, 60 days, 60 days, and 90 days, the spray was sprayed again and the presence or absence of nozzle clogging was examined. The maximum number of days the nasal spray can be left unused without clogging is displayed.

In addition, in Table 1, phthalimide cap a) & j Phthalimide #S body (b) & end 11 ■ Phthalimide-4 body (C) & Hot Examples 4 to 8 From the ingredients of the formulation listed in Table 2 Inks were prepared in the same manner as in Examples 1 to 5, and the same tests were conducted for each ink.

Comparing the Examples and Comparative Examples shown in Table 11, the ink containing the phthalimide conductor according to the present invention was compared with the additive-free ink and the ink containing the conventionally known dye solubilizer. It will be appreciated that softening results in better results in dye dissolution stability and rejetability (anti-clogging properties).

Patent applicant Dainippon Ink and Chemicals Co., Ltd. Procedural amendment (method) % formula % 1. Indication of the case 1982 Patent Castle No. 47602 28 Name of the invention Water-based ink for inkjet printers 3. Person making the amendment Related Patent applicant: 3-35-58 Sakashita, Itabashi-ku, Tokyo 174, 1982
On June 11, 2015, in column 6 of the “Title of the Invention” of the specification subject to amendment, the content of the amendment [aqueous ink for in-jet printers] was
')X 7-□, L1971-Jlk"4>Iah1
m'f, .

To do.

-48(

Claims (1)

[Scope of Claims] 1. A water-based ink for inkjet 7'' non-termination that contains water-bathable 7-thalimide S-dimer which is obtained by adding ethylene oxide or ethylene oxide and globire oxide to phthalimide. 3. Claims in which phthalimide@conductor is a compound represented by the general formula lol! A paragraph 1-
teaching ink. 8. A 2-product ink in which the phthalimido compound is a compound of the general formula, where m is 1 and n is a number from 5 to 90.