JPS638464A - Fluorescent aqueous ink - Google Patents

Abstract

PURPOSE:The titled ink well coloring in fluorescence, not erasing halograph on non-carbon paper, not causing change in color on heat-sensitive paper, containing specific dye, sorbitan and water. CONSTITUTION:The aimed ink consisting of (A) preferably 0.05-1.00wt% dye shown by the formula (A is Na, K, monoethanolamine, diethanolamine or triethanolamine), (B) preferably 1.0-50wt% sorbitan and (C) water.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a fluorescent water-based ink. More specifically, the present invention relates to a fluorescent water-based ink that exhibits good fluorescent color development, does not erase handwriting on non-carbon paper, and does not cause discoloration on thermal paper.

(Prior Art) Fluorescent water-based inks with bright colors have been known for use in so-called underline markers. Products containing polyethylene glycol as a coloring agent are known.

<General formula> ○ o3A (Problems to be solved by the invention) However, such fluorescent water-based inks do not provide sufficient fluorescence, and due to the action of polyethylene glycol used as a fluorescent coloring material.

Handwriting on non-carbon paper may disappear.

There was a problem that discoloration occurred with thermal paper.

(Means for Solving the Problems) Therefore, the present inventor has completed the present invention as a result of intensive research in order to solve the above problems. That is, one aspect of the present invention is a fluorescent aqueous ink containing at least a dye represented by the following general formula, sorbitan, and water.

General formula The present invention will be explained in detail below.

The dye represented by the above general formula is used as a coloring agent, and the amount used is preferably 0.05 to 1, D 0% by weight for a so-called underline marker ink.

Sorbitan is used as a fluorescent coloring agent for dyes represented by the above general formula, and the amount used is 1.0 to 50
Weight percent is preferred.

In addition, other acidic and/or direct dyes may be added to obtain colors other than red as fluorescent inks, water-soluble surfactants may be used as penetrants, and ethylene glycol, diethylene glycol, or urea may be used as pen nib desiccant agents. Alternatively, it is possible to select and add a urea derivative as appropriate.

(Function) The reason why the fluorescent aqueous ink of the present invention provides sufficient fluorescence and does not erase handwriting on non-carbon paper or cause discoloration on thermal paper is surmised as follows.

In other words, sorbitan has a stronger action of promoting the lake formation of the dye represented by the above general formula on the paper surface than polyethylene glycol, so it can provide sufficient fluorescence and, like polyethylene glycol, can be used on non-carbon paper and thermal paper. Since it does not affect the color former, it is presumed that it will not erase handwriting or cause discoloration.

(Examples) The present invention will be explained in more detail below using examples. In the examples, "parts" indicate "parts by weight."

Example 1 ■ SO3 east sorbitan 30.0 parts ethylene glycol 10.0 parts water
599
The above components were mixed and stirred at 40 to 60°C for 2 hours to obtain a red fluorescent water-based ink.

Comparative Example 1 A red fluorescent water-based ink was obtained in the same manner as in Example 1 except that sorbitan was removed from Example 1 and ethylene glycol was added accordingly.

Sorbitan of Example 2 25.0 parts Methanol 5.0 parts Water
698 parts The above components were mixed and the same procedure as in Example 1 was carried out to obtain a red fluorescent water-based ink.

Comparative Example 2 Sorbitan was removed from Example 2, and 5.0 parts of polyethylene glycol $1000 and 20.0 parts of water were added thereto.
Other procedures were the same as in Example 2 to obtain a red fluorescent water-based ink.

Example 3 SO, K C, I Ac1d Blue 9 0.
05 parts Sorbitan 5.0
Part Score Roll 900 (Non-ionic interface 0.5 parts activator, manufactured by Kao Atlas ■) Diethylene glycol 20.0 parts Water
74
35 parts The above components were mixed and the same procedure as in Example 1 was carried out to obtain a purple fluorescent water-based ink.

(Effect of the invention) Examples 1 to 3. A commercially available underline marker (Pentel Signal S 510, manufactured by Pentel ■) was filled with the inks of Comparative Examples 1 and 2, and a test was conducted. The results are shown in the table.

Table (Rice 1) Fluorescent chrominance degree The degree of chrominance of fluorescent light left on the writing paper marks on JISP32o1 writing paper A was visually determined.

◯: Good color development Δ: Poor color development ×: No color development 2) Erasability It was coated on copied characters on non-carbon paper, and the erasability of the copied characters was visually judged.

○：Do not remove γ ×: Deleted (Rice 3) Discoloration The information was written on fax paper, and the presence or absence of discoloration was visually determined.

O: No discoloration ×: Discoloration As explained above, the fluorescent water-based ink according to the present invention has good fluorescent color development, does not erase handwriting on non-carbon paper, and does not cause discoloration on thermal paper. This ink has excellent performance.

Claims (1)

[Scope of Claims] A fluorescent water-based ink containing at least a dye represented by the following general formula, sorbitan, and water. <General formula> ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (A is sodium, potassium, monoethanolamine,
Indicates either diethanolamine or triethanolamine. )