JPH0826267B2 - Dye ink for writing instruments - Google Patents

Description

TECHNICAL FIELD The present invention relates to a dye ink for a writing instrument which has good ink ejection and a long writing distance.

(Prior Art) In recent years, writing instruments have been required to have fine handwriting, and both writing instruments that use water-based ink and writing instruments that use oil-based ink tend to have smaller diameter nibs.

(Problems to be Solved by the Invention) However, when the pen tip is made thin in order to obtain a fine handwriting, there is a problem that ink ejection is reduced and blurring easily occurs, resulting in a shorter writing distance. did. Therefore, various surfactants have been tried to be added in order to increase the ejection amount of the ink, but none of them have been sufficiently satisfactory.

(Means for Solving the Problems) The present invention provides a dye ink for a writing instrument characterized by containing at least a dye excluding a basic dye, a solvent, and a substance represented by the following general formula. is there.

_{(Formula) R-O- (CH 2 CH} 2 O) n -CH 2 COOX The present invention will be described below.

Dyes excluding basic dyes are used as colorants, and water-soluble dyes in which dye molecules such as acid dyes and direct dyes become anions, and oil-soluble dyes that do not ionize in a solvent can be used.

In the case of a water-based ink, the solvent may be ethylene glycol, glycols such as propylene glycol, alkanolamines such as monoethanolamine, cellsolves such as ethylene glycol monoethyl ether, alone or in combination, in addition to water. In the case of oil-based ink, alcohols such as ethanol, ketones such as methyl ethyl ketone, esters such as ethyl acetate, aromatics such as benzene and xylene, and cellosolves such as ethylene glycol monoethyl ether may be used alone or in combination. it can.

The substance represented by the following general formula is used as an ink discharge improver, and its amount is 0.1% with respect to the total amount of ink.
~ 10 wt% is preferred. Note that n is 1 to 10
This is because if n is 11 or more, the desired ink ejection improving property is significantly reduced or cannot be obtained.

_{(Formula) R-O- (CH 2 CH} 2 O) n -CH 2 COOX When using the substance represented by the above general formula in water-based ink,
As X, alkali metals such as Na and K, ammonium, alkanolamines such as monoethanolamine, diethanolamine, triethanolamine, and dimethylethanolamine can be used.

When used for oil-based ink, it is preferable that n is 1 or 2 and R is an alkyl group having 10 to 17 carbon atoms.

In addition to the above components, various additives used for writing instruments can be used. Examples thereof include preservatives, rust preventives, antifungal agents, surfactants, natural resins, and resins such as rosin-based resins, phenol resins, and synthetic resins such as polyvinyl butyral.

The method for preparing the dye ink for a writing instrument can be easily obtained by stirring and mixing the above components using a conventionally known stirrer.

(Function) In the dye ink for a writing instrument according to the present invention, the substance represented by the general formula improves the wettability of the ink to the nib member, so that the ejection of the ink is improved, and therefore, the blurring is less likely to occur. , It is estimated that the writing distance will be longer.

(Example) Example 1 CI Direct blak 38 (direct dye) 8.5 parts by weight of _{C 17 H 35 -O- (CH 2} CH 2 O) 4 -CH 2 COOK 0.2 parts by weight of ethylene grayed reel 19.0 parts by weight of water 72.3 parts by weight The above Each component was heated to 40 to 50 ° C. and stirred for 2 hours to obtain a black aqueous dye ink.

Comparative Example 1 Black aqueous dye ink was obtained in the same manner as in Example 1 except that C ₁₇ H ₃₅ —O— (CH ₂ CH ₂ O) ₄ —CH ₂ COOK was removed from Example 1 and the amount of water was increased. Got

Example 2 CI Acid BLUE 90 (acid dye) 6.0 parts by weight of _{C 20 H 41 -O- (CH 2} CH 2 O) 10 - CH 2 COONa 0.2 parts by weight of ethylene glycol 20.0 parts Glycerin 10.0 parts Formalin (preservative) 63.1 By weight Each of the above components was heated to 40 to 50 ° C. and stirred for 2 hours to obtain a blue aqueous dye ink.

Example 3 CI Solvent Red 81 (manufactured by phenolic resin, Hitachi Chemical Co., Ltd.) (oil soluble dye) 6.0 parts by weight of _{C 17 H 35 -O- (CH 2} CH 2 O) 2 -CH 2 COOH 0.2 part by weight Hitanoru 1501 5.6 Parts by weight Ethylene glycol monomethyl ether 88.6 parts by weight By stirring the above components for 2 hours, a red oil dye ink was obtained.

Comparative Example 2 Same as Example 3 except that C ₁₇ H ₃₅ —O— (CH ₂ CH ₂ O) ₂ —CH ₂ COOH was removed from Example 3 and ethylene glycol monomethyl ether was increased by that amount, and red was obtained. An oil dye ink was obtained.

(Effect of the Invention) The inks of Examples 1 and 2 and Comparative Example 1 were used as Super Balls.
BH16 (made by Pentel Co., Ltd.) was filled with 2.4 g, and a quality test was conducted. The results are shown in Table 1.

The inks of Example 3 and Comparative Example 2 were used to sign Pentel S570.
(Pentel Co., Ltd.) was filled with 1.4 g, and a quality test was conducted. Table 2 shows the results.

As described above, the dye ink for a writing instrument according to the present invention has excellent properties such that the ink discharge amount is good and the writing distance is long.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-51-31526 (JP, A) JP-A-62-116678 (JP, A) JP-A-62-201980 (JP, A) JP-B 5- 40795 (JP, B2) Japanese Patent Publication 6-47661 (JP, B2)

Claims (1)

[Claims] 1. A dye ink for a writing instrument, comprising at least a dye other than a basic dye, a solvent, and a substance represented by the following general formula. _{(Formula) R-O- (CH 2 CH} 2 O) n -CH 2 COOX