JPS62121775A - Water-base recording ink - Google Patents

Abstract

PURPOSE:To widen the range of selection of recording paper to be used, to improve the quick drying properties after recording, and to eliminate clogging of a nozzle, by incorporating a specified alkyl glycidyl ether sulfonate into a water-base recording ink. CONSTITUTION:A compound of the formula (wherein R is 3-12C alkyl; M is an alkali metal, ammonia, alkoxyl or amine) is incorporated into a water-base recording ink which contains a water-soluble dye, a water-soluble organic solvent and water as essential components. The amount of the compound to be incorporated is preferably 0.1-5wt%.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of application on seating) This invention is a water-based ink suitable for inkjet recording, writing instruments, AD recording, stamps, etc. The present invention relates to an aqueous recording ink that does not cause nozzle clogging, has excellent quick drying properties after printing, and can expand the selection range of recording paper.

(Prior art) Recording using the inkjet recording method has low noise.
In addition, it is easy to record at high speed and in color, and it has the advantage of being able to use plain paper, so it has been actively developed and applied to various printers, facsimile machines, etc. in recent years.

As an inkjet recording method, a variety of unique recording methods have been proposed using various combinations of ink droplet control methods and ejection methods.The inks used for these methods are also oil-based and water-based, and water-based recording inks are widely used. The essential components used are water-soluble dyes, water-soluble organic solvents, and water.

(Problems to be Solved by the Invention) However, even in the above-mentioned inkjet recording method, the ink must be continuously and stably ejected as a uniform liquid portion from a small nozzle orifice, and therefore, the above-mentioned aqueous recording Another issue that needs to be resolved regarding the ink used is nozzle clogging.

As a solution to this problem, a water-based cod ink composition containing a water-soluble dye, a water-soluble organic solvent, and water as essential ingredients is used to prevent the precipitation of moisturizers and dyes to prevent dryness inside the nozzle and at the nozzle tip. Dye dissolving agents and fungicidal agents to prevent the growth of mold are often added.

However, it is necessary to quickly dry the ink particles ejected from the nozzle orifice after being deposited on the recording paper, which is contrary to the requirement of 5 m that the nozzle tip should not be dried. If a formulation that does not dry at the nozzle tip is adopted, the quick drying properties on the recording paper will be impaired.

In addition, in order to solve the problem of quick drying on recording paper, when using SCC recording in which ink rapidly permeates and dries, the range of options for recording paper to be used is limited. Water-based recording ink can be used to record not only on inkjet recording paper but also on ordinary paper that is generally coated with a layer (car recorder paper, recorder paper, and copy paper), and it dries quickly after recording. The purpose of this invention is to provide characteristics that prevent clogging and the like in the nozzle.

(Means for Solving the Problems) In order to solve the above objects, the present invention uses an aqueous recording ink containing a water-soluble dye, a water-soluble organic solvent, and water as essential components. Glycyl ether sulfonate HzOR HOH CkbSOsM (wherein, 8 is an alkyl group of 6 to 12 carbon atoms, M is sodium, potassium chloride alkali, ammonia group,
This paper proposes an aqueous recording ink having 1 kir (indicating an alkoxyl group or an amine group).

Among direct dyes and acid dyes, the water-soluble dyes that can be used in the present invention are preferably dyes that have good solubility in water and water bathing organic solvents (dyes that improve the water resistance and disease resistance of recorded images, such as C, 1, Threat Blaa ni 7, na 19
, na3t, suiog, φ131C, 1,1v+id B
lack nako, naku, ≠37. ≠9 da, na1jI
C, 1, Direct Bhb-Nako, Na6, Na41◆
qt, ψ/9'lC, 1,7v+id Blu-Φri,
Na9.4100. +/47. ≠ko3daC,1,Di
rsct Rad *8st, 4th - 4th 9
9C, 1, hcid Nd 4/g, Su! &+9'A, ≠ call, Nayu 59C, 1, IJ
direct Yellow ≠t1 Nacos Sus
tr, φza6.4ia2C,1, Aeid Yal
lOu) ψ7. +/7, Nadako, NaAj, Su/
Is it possible to solve the problem by considering the dissolution and precipitation of the dye after processing the iron? It is desirable to make it less than wt.

In addition, examples of water bath/EE bath agents include ethylene glycol, di- or V-nitri or V-epolyethylene glycol,
Polyhydric alcohols such as propylene glycol, diglopylene 7/I)col, siglopylene glycol, hexylene glycol, glycerin, polyglycerin, ethylene glycol motsubutyl ether, ethylene glycol monoethyl ether, ethylene glycol motsubutyl ether, diethylene glycol monoethyl glycol, diethylene glycol monoethyl glycol, diethylene glycol, diethylene glycol dimethyl ether,
Triethyl L/7 glycol monoethyl ether, glopylene glycol monomethyl ether, glopylene glycol heptanoethyl ether, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, diethylene glycol monoethyl ether acetate, glycerin heptanoacetate Alkyl ethers of polyhydric alcohols, their acetates, or air amino alcohols can be used alone or in combination of two or more, and the additive 21Ot improves the ejection stability and low-temperature stability of the ink after addition. Considering g～lI
A range of wt is desirable.

The alkyl glycyl ether sulfonate added to the water-based recording ink containing the above water bath dye, water-soluble organic solvent, and water as essential components is an anionic surfactant represented by the above structural formula, and has alkali resistance and oxidation resistance. However, according to the research conducted by the inventor of the present invention, the present invention has three advantages: it has excellent penetrating power and promotes the solubility of dyes. The above alkyl glycyl ether sulfone &l is used as a penetrant and dye dissolution aid in aqueous recording inks.
It adds 1 gv. 1 Jat is 0, /- as a penetrant and dye solubilizer! rwt% or preferably;
Equipment in this range should be heated to 4°C! -/6 centipoise range to obtain ejection stability.

However, the amount of added violet is 0. /wt% or less, the penetration power to woodcutter is 959, and quick drying property after recording cannot be obtained.

Further, when the amount of KJ violet is 1 wt% or more, the drying bait is excellent, but the ink becomes highly viscous, which deteriorates the ejection stability of the ink.

Incidentally, the ink according to the present invention may contain an antifungal agent such as dioxane, sodium dehydroacetate, and sodium benzoate for long-term storage without impairing its properties.

(Function) The aqueous first recording ink according to the present invention can be used to record not only on inkjet recording paper but also on commonly available plain paper, and has excellent quick drying properties after recording.
Furthermore, no clogging or the like occurs in the nozzle.

In other words, inkjet recording chess is designed to improve the appearance of drying when the ink and counterfeit impinge on the paper surface from the nozzle orifice of the inkjet recording device and are absorbed. , the size of plain paper.

Penetration and absorption properties change depending on water absorption, Sorahara Taku, air permeability, and smoothness. As a four-drying ink that can respond to such changes in the nature of chess, the ink itself is dry.
! l Penetration power '9r: It is essential to have this, but according to the research of the present inventors, the above-mentioned furkyl glycyl ether sulfone T [ is an excellent penetrant, and by adding it, it is possible to penetrate the ink. It is possible to apply force, promote the dissolution of the dye, and eliminate problems such as nozzle clogging.

That is, this alkyl glycyl ether sulfonate t,
When a small quantity was added to an aqueous recording ink containing a water-soluble dye, a water-soluble organic solvent, and water as essential components, and a small amount was dropped onto various paper surfaces, the drying time was less than 3 seconds on any paper surface. It exhibits sufficient drying properties, and prints well with an inkjet printer. Therefore, when using the ink according to the present invention, it is possible to expand the selection range of recording paper.

(Examples) Examples of the present invention will be shown below, but the present invention is of course not limited to these examples.

Arrangement example 1 C, 1, Direct Black/9
2. ! rvrt96 glycerin 8.0 #diethylene glycol
! ,0 Sodium dehydroacetate
0. l Octyglycyl ether sulfonic acid potassium 0.41 ion exchange water
7 &, t #Combination example 2 C, 1, Ar1d Blueφup a
, Owt% PEG Su JOO/! , 0 1 diethylene glycol 7-noethyl ether yo, O〃dehyde ctrn#1. soda
0. / #Butylglycide, sodium ether sulfonate o, sl ion exchange water 7
ri, 4c 1 Formulation example 3 C, L Direct Yallo+-su/f co
Da, Owt% ethylene glycol / co, 0 PEG ◆3
00 10.0 #Sodium dehydroacetate 0. / 1 nonyl glycyl ether sulfone related soda 0.1
1 Ion-exchanged water 7J, / ”Combination example 4 C, L Aρid Red Nayu S de
3. Yo wt tiglycerin! !・O" triethylene glycol monomethyl ether 6. O Sodium dehydroacetate 0. / II Sodium dodecyl glycyl ether sulfonate 1. ON ion exchange water
7-tei・da I comparative formulation example 1 C, 1, Direct Blackφ/9
λ, j wt% glycerin/to, 0
1 Diethylene glycol 1.0 7 Sodium dehydroacetate θ, ll Ion exchange water
77, da I comparative formulation example 2 C, 1, Ac1d Bl gain, υ da
λ、Owtchi PEG Su JOO/! , 0 # diethylene glycol monoether ether,
0 〃Sodium dehydrobutyrate OJ N ion exchange water Kuku・9 〃Above combination side 1
~4 and the composition of Comparative Formulation Example 1.2 were mixed, and the pore size O,
The ink was adjusted by passing suction F through a membrane filter of <tSμ, BR under reduced pressure, and air purging.

The obtained ink was recorded using a drop-on-demand type inkjet recording device rIt at a frequency of KHz and a pulse RT.
Each recording test was conducted under the conditions of kE 10 V and a nozzle diameter of 60 μm, and the following properties 113 to (3) were tested.

11J Continuous discharge stability However, a continuous discharge test was conducted for an hour at 5°C, &C, and q°C under ambient conditions.

Stable and clear records were obtained for all Song cases.

(2) Discharge response We performed intermittent discharge every 13 minutes and discharge immediately after constant release at 4°C, but in both cases, the initial record was maintained without any modification to the nozzle clogging. A stable and clear record that is exactly the same as the J method was observed.
i-writing paper A (JRS-P62A1 standard desk note paper), writing paper B (office 7 yen according to JIS P52o2 standard), writing paper C (JIS P3203
The drying properties were compared using the following tests using notebook paper (according to the standards of 1999).

(a) Transfer one line on the above paper using an inkjet printer.
Set to 5 to print at second intervals for 1 minute + nJ (/-
line) printed. Place this printed paper on a glass plate,
After 10 dollars, I placed a sheet of paper of the same quality on the printing surface, placed a glass plate and a weight on top of it, placed the shoji lingzoo f on it, crushed the ryogi, stood still for 1 minute, and when I let go of the ryogi, IL The results of the test are shown in Table 1. In addition, if the printing time is 70 seconds or less, no printing will be transferred at all in practical terms. Does this mean that if the printing time is longer than 1 minute, all of the letter J has been transferred? :;t! Ki
do.

(b) Friction test method Immediately after recording with an inkjet printer on the above paper (7 to 2 seconds after printing the record), after rubbing the face of the letter with a finger,
I celebrated the evil of the seal. The results are shown in Table 2.

Table 2 Evaluation method ○: No change at all Δ: Slightly rubbed and stained 4) Letters were blurred G'4I for inkjet recording: It dries quickly only when used, and the range of usable recording paper is limited.
The aqueous TIR2 cod ink of the present invention rich in the alkyl glycyl ether sulfone or gIL can be applied not only to inkjet recording paper but also to Umbrella at2M papers A, B, and C.
It was observed that it had a faster drying property than the other one.

(Children of the Invention-4,) From the above, it is clear that the Ki water-free recording ink of the present invention satisfies various characteristics as an inkjet recording ink, provides particularly clear recordings, and is compatible with conventional inkjet recording inks. It is an excellent water-based recording ink that does not cause the nozzle clogging that occurs with other inks, and the quick drying properties of this water-based ink make it possible to record on commonly available writing papers. The range of recording paper that can be used is widened, and the speed of inkjet recording devices can be further increased.The aqueous recording ink according to the present invention is not limited to inkjet printing, but can also be used for dovetail printing, recording needles, etc. For stamps 4
? Can be used as Tanizashi's water-soluble recording ink.

Procedural amendment (1 ship) December 24, 1985

Claims (1)

[Scope of Claims] In water-based recording ink containing a water-soluble dye, a water-soluble organic solvent, and water as essential components, a compound represented by the following general formula ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (In the formula, R is An aqueous recording ink characterized by containing an alkyl group having 3 to 12 carbon atoms, M represents an alkali metal, an ammonia group, an alkoxyl group, or an amine group.