JPS60124670A - Ink - Google Patents

Abstract

PURPOSE:To provide a water ink which has excellent long-term stability, water resistance, dye developability and dry resistance when left standing in air over a long period of time, by blending a specified tert, amine compd. or a triazine derivative with an aq. soln. of a water-soluble dye. CONSTITUTION:A compd. of formula I (wherein 1<=a<=5; 1<=b<=5; 1<=c<=5) or a compd. of formula II (wherein 1<=n<=5) and optionally a solvent such as polyhydric alcohol, glycol, or glycol ether, a preservative, etc. are blended with an aq. soln. of a dye such as a water-soluble acid dye, direct dye or basic dye to obtain the desired ink. An example of the compd. of formula I is a compd. of formula III. An example of the compd. of formula II is a compd. of formula IV. These compds. are used in a quantity of pref. 0.5-3wt% based on that of the ink.

Description

[Detailed Description of the Invention] It relates to ink, and more specifically, it has good stability over time, good water resistance, improved color development of the dye, and good drying resistance (evaporation stability) even when left in the air for a long period of time. Regarding excellent water-based inks.

Conventional ink for writing instruments has disadvantages such as when the cap of the writing instrument is removed and left in the air for a long period of time, the dye precipitates on the tip of the pen, causing scum, discoloration, and the inability to write. If the stand is left with its lid open, dyes, etc. will precipitate on the surface of the board, resulting in uneven printing and discoloration.The present invention solves these shortcomings and provides an ink with excellent stability over time, dryness resistance, and water resistance. It provides:

That is, the gist of the present invention is an ink characterized by blending (A) or (B) represented by the following general formula into an aqueous solution of a water-soluble dye.

Next, each component of the water-based ink of the present invention will be explained in detail.

As the water-soluble dye, dyes such as water-soluble acid dyes, direct dyes, and basic dyes can be used.

For example, acid dyes include C1, Ac1d Oren
ge (C1, 15575), C1, Ac1d Re
d27 (C1, 16185), C1, Ac1d Bl
ue93 (C1,42780), Direct Fast BIackD (C1,2
7700), C1, Direct BIack19 (C
1,35255), Direct Sky B1ue6
B (C1,24410), as a basic dye, C
I, Ba5ic Red 1 (C1,45160
), C1,Ba5ic Blue 7 (C1,42
595), CI Ba5ic Yellow 2 (C
1,41,000), these can be used alone or in combination with other water-soluble dyes. These dyes may be varied depending on the purpose, but best results are obtained when they are used in an amount of 2% to 30% (by weight) of the ink.

Next, the compounds represented by the general formulas (A) and (B) are changed depending on the purpose of use, but 0.5% to
The best results can be obtained when using 3.0% (by weight). The effects of adding the compounds represented by the general formulas (A) and (B) are as follows.

Since the solubility of dyes can be increased, dyes that were previously difficult to use (especially direct dyes) can now be used, and ink with good water resistance can be obtained. In addition, it improves the color development of the dye and
Since it is a high boiling point compound, it prevents ink evaporation and eliminates dye precipitation, making it possible to replace ink with good stability over time and excellent drying resistance.

Further, if necessary, solvents such as polyhydric alcohol-based melts, glycol-based melts, and glycol ether-based solvents, as well as preservatives, antifungal agents, surfactants, and the like can be used as appropriate. This will be explained below using examples.

Example 1 Ink for writing instruments (unit: parts by weight)・C1,D
direct Black19 1fi(C1,3525
5) - Water 50 (a=b=c=l in the general formula) CI, CI-1, OH 1 (n-1 in the general formula) - Thiodiglycol 2.5 - Phenol 0.5 - Ethylene glycol 20 - Diethylene glycol 10 The above water, compounds (A) and (B), and ethylene glycol and diethylene glycol were mixed to completely dissolve the dye, and then the remaining components were added, mixed and stirred to obtain a black ink.

Example 2 Stamp ink C1, Direct B1ack51 20 (C1,
27720) ・Glycerin 56 ・Water 20 Sodium dodecylbenzenesulfonate 1 (surfactant) (CHLCH,O), H 1 (n=2 in the general formula) Mixture of the above water, compounds (A) and CB), and glycerin After the dye was completely dissolved in the liquid, the remaining components were added, mixed and stirred to obtain a black stamp ink.

Example 3 Ink for writing instruments C1, Ac1d Red87 10 (C1,45380) Water 6゜ Ethylene glycol 28 Sodium benzoate (preservative) I CH, CH.

(In the general formula, a=b=2, c=1) (C1CH2O), H 7 (n=2 in the general formula) The above components were completely dissolved to obtain red ink.

Example 4 Ink for writing instruments C1, Ba5ic B1ue9 15 (C1,52015) Water 50 Ethylene glycol 22 Diethylene glycol 11 Sodium benzoate (preservative) I CH□CH3 (In the general formula, a=b=l, c=2) CH, CH, OH ♂ (n=1 in the general formula) A blue ink was obtained by completely melting each of the above components.

Even after filling a writing instrument similar to a commercially available felt-tip pen with the ink of Example 1.3.4 and leaving it at room temperature for 3 weeks with the cap removed, the dye did not precipitate on the pen tip, and writing did not cause smudging. There wasn't. Furthermore, there was no change in color development, and the color tone was the same as that of the initial writing line.

When a commercially available stamp pad was filled with the ink of Example 2 and stamped with a rubber stamp, a clear stamp was obtained and the water resistance was also good.

that's all

Claims (1)

[Scope of Claims] In an aqueous solution of a water-soluble dye, (A) or (
Ink C11, CH characterized by containing B). (1≦a≦5) (l≦b≦5) (1≦C≦5) (C
H, CI, O), H 1 (1≦n≦5)