JPS58201865A - Aqueous ink for ball point pen - Google Patents

Abstract

PURPOSE:An aqueous ink for ball point pens, prepared incorporating a specific alkyl acid amide with an aqueous ink, having improved abrasion preventing effects between metallic balls and tips and lubricity, and capable of giving smooth writing conditions. CONSTITUTION:An aqueous ink prepared incorporating preferably 0.01-3wt% alkyl acid amide of formulas I and/or II (R is 8-16C alkyl; M is H, NH4 or alkali metal), e.g. octylsulfamidoacetic acid (salt) or caprylic acid amidoacetic acid (salt), with an aqueous ink. Preferably, the aqueous ink consists of 0.5- 30wt% water-soluble dye, e.g. an acid dye or direct dye, 10-40wt% water- soluble organic solvent, e.g. ethylene glycol and 28-89.5wt% water. EFFECT:Improved abrasion resistance even with tips made from a synthetic resin, e.g. polycarbonate, other than metal and remarkably extended writing distances.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water-based ink for a ballpoint pen, and more particularly to a water-based ink for a ballpoint pen that has excellent lubricity and has a smooth writing feel.

Conventional water-based inks for ballpoint pens use glycol solvents, glycol ether solvents, and glycol ether ester solvents as evaporation inhibitors.

A water-soluble dye such as a direct dye, an acid dye, or a basic dye is dissolved in an aqueous solution of a water-soluble organic solvent such as an amine solvent, and a preservative and an anion are added as appropriate.

Or low viscosity water-based inks containing nonionic surfactants, but these water-based inks lack lubricity and cause large friction between the ball and the chip. Abrasion has caused the ball to wobble, resulting in blurred handwriting and an inability to write smoothly.
When writing, abrasion occurs between the ball and the tip.

There was a problem that the writing quality was not smooth.

The inventors of the present invention have completed two inventions as a result of intensive research to solve the problems mentioned above. That is, 2
The present invention provides water-based ink with the following general formula (I) and/or (
The gist of this invention is a water-based ink for ballpoint pens containing an alkylamide acetic acid represented by IT).

R-'S"02NHOH2,000M...
...(I3n-00,NH1OH2・C00M...
...(II) Although it is not clear why the water-based ink of the present invention has excellent lubricity and is effective in preventing friction between the ball and the chip and preventing wear of the chip, 1 It is assumed as follows.

Since the alkylamide acetic acid represented by the general formula (1) or (n) has a sulfonyl group and a carbonyl group in its structure, the terminal carboxylic acid group has polarity.
Especially the affinity with metal increases.

Strongly adsorbs to metal.

On the other hand, because the alkyl group is relatively long (8 to 18 carbon atoms)
), it exhibits hydrophobicity, and as a result, a thin film is formed on the metal surface, which is thought to lower the coefficient of friction between the tip and ball and have a lubricating effect.

Hereinafter, one aspect of the present invention will be explained in detail.

The alkylamide acetic acid represented by the general formula (1) or (II) is produced by reacting the corresponding alkylamide with monochloroacetic acid.

Furthermore, alkylamide acetic acid having an alkyl group having 8 to 1 carbon atoms has a particularly remarkable lubricating effect. That is, a material with a small number of carbon atoms lacks hydrophobicity, and a material with a large number of carbon atoms becomes poorly soluble in water.

Specific examples of those represented by general formula (1) include:

Octyl sulfamide acetic acid, nonyl sulfamide acetic acid,
decanyl sulfamide acetic acid, lauryl sulfamide acetic acid, tridecanyl sulfamide acetic acid, tetradecanyl sulfamide acetic acid, pentadecanyl sulfamide acetic acid, hexadecanyl sulfamide acetic acid, heptadecanyl sulfamide acetic acid, octadecanyl sulfamide acetic acid Rufamide acetic acid or their ammonium salts or alkali metal salts.

Specific examples of those represented by general formula (II) include:

Caprylic amide acetic acid, caprylic amide acetic acid.

These are lauric acid amide acetic acid, myristic acid amide acetic acid, palmitic acid amide acetic acid, stearic acid amide acetic acid, oleic acid amide acetic acid, or their ammonium salts and alkali metal salts.

These things can be used alone or in combination,
The amount used is 0.01% by weight based on the total amount of water-based ink.
If the amount is less than 3 weight, the effect will not be significant, and if it is more than 3 weight, insoluble matter may remain in the ink, the viscosity will be high, and ink discharge will be poor, so a range of 0.01 to 3 weight is preferable.

As water-soluble dyes used in the present invention, most of the acid dyes and direct dyes that are normally used in water-based inks can be used. Specific examples include Mitsui Nylon Black 0L. (C
, 1, 15711) + Water Black + 21
(mixed dye of 0,1,15985,42090°42745)
420), :c, iSynFA (0,I.

45380), 1Jxo (0, I.

45430), Daiwata Drazine ('O,I.

19140), Fukinn PB (c, L4s4
10).

Suminol Milling Yellow MR (・O, T.

22910), Brilliant Blue F'OF (0,
1,42090), Tsurufurufuru o B O(0
, 1,42755), and direct dyes include Kayaras Black G conc, (0,I, 35255).
), Direct Deep Black EX (0,1,3
0235), Direct First Black con
c, (0,1,27720), Direct First Black B (0,1,35435).

Diamond First Orange W S (0, I.

6-29156), Direct Blue 2 B (0,I
.

22610), Phthalocyanine Blue G Conch (0
, 1, 22311), Direct Sky Blue 5
B (0, 1, 24400), etc., and these can be used alone or in combination.

Preferable results can be obtained when these water-soluble dyes are used in an amount of 0.5 to 60% by weight based on the total amount of the ink. This is because if the ink is less than 0.05 weight, the ink density cannot be achieved, and if it is more than 60 weight, the ink viscosity is too high and the ink discharge may be poor when filled into a ballpoint pen.

Next, water-soluble organic solvents used in the present invention include ethylene glycol, fluoropylene gelicol, diethylene glycol, triethylene glycol, thiodiethylene glycol, 1,3-butanediol, glycerin, ethylene glycol monomethyl ether, and ethylene glycol. Glycol monoethyl ether, diethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol diethyl ether, ethylene glycol monoethyl ether acetate, formamide,
Examples include sulfolane, sorbitan, acetin, etc., and one or more of these may be used. Therefore, the amount of these water-soluble organic solvents used is 10 to 10% of the total amount of ink.
Suitable results are obtained when using a weight ratio of 40%.

Also, water is the main solvent, and how much should it be used?

The weight ratio is preferably 28 to 895 based on the total amount of ink. If necessary, penetrating agents such as anionic or nonionic surfactants, preservatives such as sodium pentachlorophenol, phenol, and polymerine, and water-soluble polymers for adjusting viscosity may be appropriately selected and used. .

Hereinafter, the present invention will be explained in more detail according to Examples, and in the Examples, the term ``1 part'' indicates ``part by weight.''

Example 1 Eiseneosin GH (0,1,45380)
4.0 parts Ethylene glycol 500 parts Ballmitutil Vechst 1.0 part (mixture of alkyl sulfamide acetic acid having 8 to 18 carbon atoms, manufactured by Hoechst) Pentachlorophenol 0.2 parts Neugen P 01 part (Daiichi Kogyo Seiyaku) (Nonionic Surfactant Co., Ltd.) Water
64.7 parts While heating the water and ethylene glycol in the above ingredients to 50 to 60°C, add Eiseneosin GH.

Kistoyopentachlorophenol and Neugen P were sequentially added to Paul Mitsutil, and after stirring for 2 hours, the mixture was filtered to obtain a red water-based ink.

Comparative example 1 Except for Bohrmittel-Hoechst in Example 1.

A red water-based ink was obtained in the same manner as in Example 1, except that water was added in the same amount.

=91 Example 2 Kayaras Black G Conch
70 copies < c: ■, 35225. Manufactured by Nippon Kayaku 1)
Propylene glycol 1' 0.0 part Thiodiglycol 10.0 part Lauryl sulfamide Sodium acetate 0.2 part A water-based ink was obtained.

Comparative Example 2 A black water-based ink was obtained in the same manner as in Example 2, except that water was added instead of sodium lauryl sulfamide acetate.

Example 3 Example 1 except that Sarkosil O (a mixture of alkylcarboxylic acid amide acetic acid having 8 to 18 carbon atoms, Geigy Co., Ltd.) was added in place of Ball Mitsutil Hoechst in Example 1.
A black water-based ink was obtained in the same manner as above.

10- Example 4 Soluble Blue Daiwatadrazine (0.1.19140, l
3.0 parts stearic acid amide acetic acid
0.5 parts oleic acid amide amsonium acetate 1.5 parts ethylene glycol
20.0 parts sulfolane
10.0 parts water
A green water-based ink was obtained using 62.0 parts of the above components in the same manner as in Example 2.

Example 5 0.5 part of stearamide acetic acid of Example 4 was changed to 2.5 parts. A green water-based ink was obtained in the same manner as in Example 4, except that 60.0 parts of water was changed from 62.0 parts.

The inks obtained in Examples 1 to 5 and Comparative Examples 1 and 2 were applied to commercially available metal tip ballpoint pens (tip material: true,
Pole material: steel containing tungsten carbide, ball diameter 0. Table 1 shows the results of testing the writing distance and the presence or absence of unpleasant sounds when writing after filling the tube into a tube (6 m) and leaving it in a constant temperature room at 70° C. with a cap for 10 days.

Table-1 *1. Writing distance: Using a commercially available self-rotating continuous writing force measuring device (screw tightening device), writing speed 7''/s e C, load 100.!i'.

The writing distance was measured by continuous writing at an angle of 70° until blurring occurred.

*2 Unpleasant sound when written on paper. Cases in which an unpleasant sound occurred were judged as ``present,'' and cases in which no unpleasant noise occurred were judged as ``absent.''

As described above, when the ink of the present invention is used in a water-based ballpoint pen. It has excellent abrasion prevention effect and lubricity between the metal ball and the tip, and even when the tip is made of synthetic resin such as polycarbonate instead of metal, it has excellent abrasion resistance, and as a result, it has a long writing distance that allows smooth writing. This is a water-based ink for ballpoint pens that has significantly extended the

Patent applicant: Pentel Co., Ltd. 1 3-

Claims (1)

[Scope of Claims] A water-based ink for a ballpoint pen, comprising a water-based ink blended with an alkylamide acetic acid represented by the following general formula (I) and/or (I). R-802NHOH2・000M・・・・・・・・・
...(I)R-Co, NH, OH2・000M
・・・・・・(It)