JPS6076575A - Water-based pigment ink - Google Patents

Abstract

PURPOSE:To provide a water-based pigment ink having excellent dispersion stability and drying resistance, and suitable for the use in the state of low viscosity, e.g. for writing utensils, by adding a resin acid and a specific aminopropanol derivative to a water-based pigment ink. CONSTITUTION:The objective ink can be produced by mixing, grinding and dispersing (A) a pigment, (B) an aminopropanol derivative of formula (R is H, CH3, OH or CH2OH; n is 1-20), (e.g. 2-amino-2-methyl-1-propanol), (C) a resin acid such as shellac, (D) a water-soluble organic solvent such as glycol solvent, etc., and (E) water, etc. using a pigment dispersion machine. The preferable weight ratios of A:B:C:D:E are (5-20%):(0.1-20%):(1-30%):(10-30%):(70-40%). If necessary, the ink may be incorporated with 0.1-1% surfactant. USE:Writing utensils, fountain pen, recorder pen, printing, etc. using fiber tips, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an aqueous pigment ink, and more particularly to an aqueous pigment ink having excellent dispersion stability and drying resistance.

Since then, it has been excellent in water quality and has been used for various purposes.

However, when used at a low viscosity such as ink for writing instruments, the dispersibility of a single pigment is unstable and agglomeration tends to occur.

There was a problem that Yuki could no longer be played.

Therefore, it is used as a dispersant to disperse one ingredient at a time.

Various surfactants have been used, but they are not yet sufficient, and in recent years emulsions such as acrylic acid copolymers, amines and ammonium salts of acrylic acid copolymers have also been used. However, because Emulna 1-N dries quickly, there are frequent problems such as the tip of the 8-pin brush drying out, and the LD emulsion being destroyed by the solvent.

Furthermore, as the ink is used for writing and writing, it is necessary to prevent drying at the pen tip as much as possible.

As a result of various studies as an agent for improving the dispersibility and drying resistance of the above-mentioned aqueous pigment ink, the present inventors found that the combination with a resin acid and an aminopropanol derivative improves the dispersibility and drying resistance of the water-based pigment ink. The present invention was completed based on the discovery that it is superior to vermilion.

That is, the gist of the present invention is an aqueous pigment ink characterized by containing a resin acid and an aminopropanol derivative represented by the following general formula.

General formula % formula %: Resin acids have been used in pigment inks for a long time, but this takes advantage of the film-forming ability of resin acids.
When a large amount of it is used in a writing instrument, there is a problem that if it dries at the nib, it becomes impossible to write or the writing taste becomes poor.

Therefore, in the present invention, a resin acid is used as a dispersant and a salt is formed with the resin acid.

The above-mentioned problems are solved by using an aminopropanol derivative that prevents resin acid from forming a film and has an effect on drying resistance.

Two aspects of the present invention will be described in detail below.

Examples of resin acids include shellac such as general shellac, dewaxed shellac, bleached shellac, and bleached shellac, humic acid,
Examples include rosin.

The aminopropanol derivatives represented by the general formula are:
2-amino-2-methyl-1-propyl, 2-amino-2-ethyl-1-ph.

Panol, 2-amino-2-methyl-13-propanfol. Examples include 2-amino-2-ethyl-15-propanediol and 1 to 20 mole ethylene oxide adducts thereof.

As the pigment, all commercially available oils can be used, examples of which are listed below.

Carbon black, 7 talon anine blue (0, T, 7
4160), phthalocyanine green ((E, 1.
74260), Hansa Yellow 30 (C, L1167
0)l Disazo Yellow OR (0, T, 21% is preferred.

Incidentally, the proportion of each type of pigment to be used is selected as appropriate.

As the solvent, not only water but also water-soluble organic solvents such as glycol solvents, glycol ether solvents, glycol ether ester g agents, glycerin, and pyrrolidone can be used.

In addition, antiseptic fungicides such as 1,2-benzisothiazolin-3one, pentachlorophenol, and cresolate, lubricants such as water-soluble silicone oil, and various surfactants can be appropriately selected and used.

The manufacturing method of water-based pigment ink is as follows: 5 to 20% by weight of pigment, 7% of water.
0 to 40% by weight, water-soluble organic enhancer 10 to 30% by weight, and resin acid 1 to 30% by weight.

(In order to improve pigment wetting, add a surfactant of 01 to 1
Weight percentages may also be used. ], and 01 to 20% by weight of an aminopropanol derivative.

Mixing using a pigment dispersion machine such as a ball mill, roll mill, -9° mill, super mill, tights mill, or AI lighter. Grind and disperse.

The aqueous pigment ink obtained from Samurai has unprecedented dispersion stability.

Hereinafter, the present invention will be explained in detail based on Examples.
In the examples, "parts" indicate "parts by weight."

Implementation ψ111 Carbon black 100 parts Propylene glycol 5.0 parts Ethylene glycol 150 parts Shellac 2.0 parts 2-amino-2-methyl-1-propatol 200 parts Lavelin (manufactured by Daiichi Kogyo Seiyaku ■, anionic surfactant) 01 Part Emulgen 931 (dead weight Atlas (manufactured by Kiki, nonionic surfactant) 01 part Sodium pentachlorophenol (preservative) 01 part Water 4 7.7 parts Among the above ingredients, water and 2-amino-2-methyl-1 -Add shellac to a solution of glopanol and stir at room temperature to dissolve.Next, add Emuldan 931.ethylene glycol and the remaining ingredients, premix for 2 hours using a fjl stirrer, and then use a ball mill for 20 minutes. Sa, who wasted time.
Remove coarse particles by filtration or the like.

The black water-based pigment ink obtained by this process was suction-filtered for 100 d with Toyo Roshi Ji 5 C, and the result was 30
The entire amount passes through the filter paper within seconds.

Almost no residue was observed on the filter paper.

Father, I put this ink in a centrifuge.5. O00rpm, 3
Although the treatment was carried out for 0 minutes, sedimentation of the pigment was observed.

Furthermore, this ink may be filled into a cotton ball type container, the cap removed and left in a constant temperature and humidity chamber Vci O at a temperature of 20'C and a humidity of 65% for O days.

The pen tip did not dry out and writing was possible.

Comparative Example 1 A water-based pigment ink was obtained in the same manner as in Example 1 except that shellac was removed and water was added. This ink has many coarse particles.

I couldn't pass 1 bij in Toyo L Prisoner 5c.

Example 2 8181 Phthalocyanine Blue 150 parts Ethylene glycol 150 parts Propylene glycol 50 parts Decolorized shellac 1.0 parts 2-Amino-2-methyl-13-propanediol 100 parts Broxel G B

11 horn preservative) 01 part Water 539 parts As in Example 1, premix after adjustment.

Mixed and ground for 10 hours in a Sanodom mill.

Coarse particles were removed to obtain a blue water-based pigment ink.

When this ink was subjected to ioo+iff suction IjIl with Toyo Roshi A 5 C, the entire amount passed through the I filter paper within 30 seconds, and no residue was observed on the filter paper.

In addition, this ink was heated to 5.00 Orpm using a separator.
Although the treatment was carried out for 30 minutes, no sedimentation of the pigment was observed.

Fill a ballpoint pen with this ink in a furnace.JVi l
- Even if you remove the cap and leave it in a constant temperature and humidity room at 20'C and 65% humidity for 10 days.

The pen tip did not dry out and writing was possible.

Comparative Example 2 Example 2 Smell 2-amino-2-methifle 1 remaining
A water-based ftM*') ink was obtained in the same manner as in Example 2, except that propane, chlorine, and chlorine were added to 7. The pen tip of this ink dried in one day under the same conditions as in Example 2.

Example 3 Copper phthalocyanine blue - 40.1 parts Disazo yellow 50 parts Glycerin 20 parts Ethylene glycol 20.0 parts Humic acid 20 parts Additive of 110 moles of ethylene oxide to 2-amino-2-methyl-1-probatool 100 parts Emalgeno A-60 (manufactured by chemical soap lPt1, nonionic surfactant) 01 parts water 5 0. 9 *Ij A green water-based pigment ink was obtained in the same manner as in Example 1.

When this ink was filtered with IO(]mJ suction using Toyo Ikushi & 5c, it completely passed through Ikkushi within 30 seconds.
Almost no residue was observed on the filter paper.

My father, put this ink in a centrifuge at 5,000 rpm+.
Although the treatment was carried out for 30 minutes, no sedimentation of the pigment was observed.

Furthermore, fill this ink into a padded ballpoint pen J&+L
Even if you remove the cap and leave it in a constant temperature and humidity room at 20°C and 65% humidity for 10 days.

The pen tip did not dry out and writing was possible.

As explained above, resin acids and aminopropanol KN
The aqueous pigment ink of the present invention using the 4 pigments has excellent 9-dispersion and 1-dispersion stability, and has good drying resistance, so it can be particularly used as a low viscosity ink.

Specifically, fiber, felt, monofilament 1 Fumikawa's writing instruments, capillary type writing instruments such as Mannensha, (il+
It can be suitably used for rod-type and ball-point type writing instruments, and can also be applied to recorders, printing, stamps, jet printers, etc.

Claims (1)

[Claims] A water-based pigment ink comprising a resin acid and an aminopropanol derivative represented by the following general formula.