JPS6245675A - Recording ink - Google Patents

Abstract

PURPOSE:To obtain a recording ink having excellent quick-drying properties and water resistance, by solubilizing a soln., prepd. by dissolving an oil-soluble dye in a surfactant, in a hydrophilic org. solvent and/or aqueous solvent. CONSTITUTION:1pt. oil-soluble dye having excellent weather resistance (e.g., C.I. Solvent Black 31) is dissolved in 0.2-5pts. anionic or nonionic surfactant (e.g., polyoxyethylene alkylphenyl ether) to prepare a soln. The soln. is solubilized in a hydrophilic org. solvent (polyethylene glycol) and/or aqueous solvent. If necessary, a bactericide, deoxidant, sequestering agent, etc., are added thereto. Thus, there is obtd. a recording ink which exhibits excellent delivery stability, wettability on paper, quick-drying properties and water resistance. This ink can also be applied to plain paper and is suited for use in ink jet recording, writing utensil, recorder and stamp.

Description

DETAILED DESCRIPTION OF THE INVENTION (This invention can be used for 1 example, for inkjet recording, for common use with kuji, etc.)
Recording durability, quick drying after printing, especially as recording ink used for stamps, especially inkjet recording ink,
This relates to a 11d recording ink that has excellent water resistance.

(GE rice! ji, technique) The inkjet recording method is made to imitate the second record head, and from the mth point, the ink droplet is layered on the ml recorder, and the ink is absorbed. This method of recording is extremely popular, and it is easy to record at high speeds and in color, and it is also possible to use plain paper. , facsimile, etc., and its application and development are actively underway.

(Problems that the invention attempts to solve) Oil-based ink has a wide range of options for recording paper, and is quick-drying (
Water-based ink has advantages such as reduced nozzle clogging due to the water resistance of the recording paper (penetration and absorption into paper), water resistance of recording paper, etc. On the other hand, water-based ink has low ejection quality and stability (flash point, toxicity The inkjet recording inks known in Japan are those in which an oil-based dye is dissolved in an oil-based refrigerant, or an aqueous dye is dissolved in an aqueous heating medium. In these inks, the dye evaporates inside the nozzle or on the nozzle surface, and the dye solidifies or evaporates at the nozzle opening, causing the ink to be no longer ejected. I have a point.

To solve this problem, if a bath agent such as polyhydric alcohol is used to prevent evaporation drying, ink drying on the recording paper will be slow, so in order to improve the appearance of the recording paper, If you don't use paper with good penetration and absorption properties, you won't be able to use Kubana P).

Therefore, this invention was developed as a special paper for Einkjet.
Records can also be recorded on commonly available old-fashioned paper.
Moreover, it is an object of the present invention to provide a recording ink yIl which is water resistant and has good luck.

(Problem?!/Means for Solving the Problem) In order to solve the above problems, the present invention uses a bath liquid containing a mophilous dye as a surfactant to create a water-viewable bath and/or Recording ink y made by solubilizing in a water solvent
1'.

The oil-soluble dye that can be used for this @light is not limited, but it is preferable to use a dye that is resistant to narrow pouring during use, such as C, 1,5olvent Black 3, 7
+4+J4c,! ;OC,1,5olvent Bts
g/I1. lJ*J! ! ,'lt, /(MC,
1, Sojwast Yellow, 7, /'i
, /4m33m56C・1. Solsee%tktad
/l, Lda, near, /u, m, etc., and it is also possible to mix and use water-based dyes within a range of L to determine the properties as a recording ink during long-term printing.

A surfactant is a general understanding of the above-mentioned 783m family, and if it does not impair the performance as a jet ink, it is not considered a super-class, but from the point of view of dissolving power, anionic or nonionic interfaces are used. Activators are effective, specifically polyoxyethylene alkyl phenol ether, polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene alkyl ether, polyoxyethine polyoxychloropylene ether condensate, norbitane ester, alkylbenzene Sulfonate, alkyl sulfonate salt, polyoxyethylene alkyl ether ester salt, alkyl sulfodisuccinate, fiI! i class 7 #: r -A/billion haester salt, sorbitan sword d
Yobo ester, castor h + flc modified τ out, alcohol phosphoric acid diester term, chrycerin fat f11j free ester, shoto fat & Ij1a! Is it convenient to use Esther's 100 million or more V-engines or more?

In addition, as organic baths for water cultivation, ethyl glycol, di- or tri- or polyethylene glycol, propylene glycol, di- or tripropylene glycol, glycerin,
Polyglycerin, hexine/glycol, methyl selon, ethyl selon, probile/cellosolve, phthyl selon, ethyl acetate, butyl acetate, and other polyalcohols and their ethers and acetates,
One or more types of supporting compounds such as N-methy/l/-2-pyrrolidone and 1,6-dimethylimidazolidino 7 may be used in combination.

What about the V4 advantages of ink mentioned in this invention, such as oil-soluble dyes and surfactants? This bath 1ej is used to solubilize it in a water-producing compound and/or an aqueous solvent.

2. If the surfactant to be used is hostile, it is preferable to disperse it into the above solvent by mixing it with a mineral bath and allowing it to soften at °C. However, in the case of a solid surfactant, After mixing the oil-soluble dye by heating the active agent, it is solubilized in the solvent, or after the surfactant is dissolved in a hydrophilic organic bath medium, the oil-soluble dye is mixed in the solvent. make it possible for you to do so.

In addition, the toilet volume of yl-face-activating injection should be 2 parts or more per 1 volume of oil bath injection, and the range of 0.5 to 6 parts is suitable.

Further, the ink according to the present invention may contain a lethal agent, a disassociating agent, and a metal capping agent to an extent that does not impede the timeliness.

(Young Fruit of the Invention) The ink and "L old bath dye according to the present invention is subjected to a nearly monomolecular reaction using a surfactant, and the aqueous organic bath medium and/or relatives are converted into an OT bath in an aqueous solvent. Therefore, it does not cause clumping, and therefore, even when used as an ink for inkjet recording, the amount of ink liquid ejected from the nozzle does not deteriorate.

In addition, since the present invention is based on an aqueous bath medium, the ejection quality is still high, and the oil bath medium is not included in the aqueous bath medium. Because it is aged, it is not as good in wet writing, continuous drying, and water resistance on paper, and it also has a wide selection of recording paper, and can be used with commonly available Shintong paper.

Therefore, the ink according to the present invention is not limited to inkjet recording, but is also used for both I&Japan and Japan, recording, recording, tagging, etc. ! It can be used as a recording ink.

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

(1) A dye bath solution was prepared by dissolving v4 of the dye for toilet use in the following oil-soluble dye Yn-surface active pouring agent.

Example 1 Dyeing agent 13wt% ethylene glycol monobutyl ether 12wt%N-
Methi N-2 pyrrolidone 25wt% polyethylene glycol Luna 201J 55wt
% water 20
wt% Example 2 Dye bath solution B 1uwt thidiethylene glycol heptanoethyl ether acetate 50wt
% diethylene glycol-k 20w
t% water 40
wt% Example 6 Dye bath 1g 1C 15wt% Ethylene/Glycol 7-ethyl ether 15
%vt%N-methyA/-2-pyrrolid 7
1uwt% polyetere/glycoluna 60 (15wt%
Ethylene glycol 2uwt% Water 35wt%
Example 4 Dye bath solution D 10wt butyl hexamer 10wt% ethyl acetate 15wt% diethylene glycol 15wt% ethylene glycol 10wt whisper water
40vt% above bath liberator~D? The compositions of Examples 1 to 4 were filtered under suction using a membrane filter with a pore size of 0.45 μm, and degassed under reduced pressure to obtain an ink of 14 ml.

If14! I used an L inkjet printer, and this is Kf! Registered sister in use and publicly available pp
When printing was carried out for 24 hours using C paper, printing was possible without any clogging 9 or any disturbance in the printing.

(1) llt water test test A printed sample was exposed to 60C water for 1 µm, and a water resistance test was conducted using the following 5-level measurement method.

(α) 5-point rating 5: No change at all 4: The color has faded a little 6: The discoloration is clearly visible 2: The color has faded considerably 1: Most of the color has faded 1 (6) Trial #! Inclination evaluation example 15 *Example 25 Example 64 Example 44 Commercially available water-based ink 6 (2) Etiquette test Inkjet recording paper and single writing paper that meets JIS P6201, using an inkjet printer.
The printer was set so that each line was printed for 5 seconds using a hard disk, and printing was performed for 1 minute (12 lines).

After 10 minutes, put the same page of paper together for printing, place the glass plate on it, match the glass plate with a weight, press the two papers together with T500gr and let it rest for 1 minute. When the two papers were separated, the printing was transferred to the overlapped paper.5
I observed that.

In Examples 1 to 4, no transfer was observed on inkjet recording paper and writing paper.

On the other hand, similar observation results using commercially available water-based ink showed no transfer on inkjet recording paper, but transfer was observed on single-print paper, and transfer was also observed 1 minute after printing. Ta.

From the above results, the recording ink of the present invention can be used as an ink for stingrays and jets, and it satisfies the requirements of ℃. It is a good recording ink because there is no vertical flow, and the fast and dry ink for the lumberjack is the same as above, and the old bath-related Toryo solidifies on the paper and its water resistance deteriorates. becomes.

Claims (1)

[Claims] 1. A recording ink comprising a solution of an oil-soluble dye dissolved in a surfactant and solubilized in a hydrophilic organic solvent and/or an aqueous solvent.