JPS60228579A - Water-based pigment ink - Google Patents

Abstract

PURPOSE:To provide ink which has excellent dispersibility and lubricity and can prevent the sinking of ball, the blurring of handwriting and squeaking when used as a ball piont pen ink, by incorporating an acrylic emulsion and a water-soluble amine salt of a high-molecular carboxylic acid in a water-based pigment ink. CONSTITUTION:A water-based pigment ink is obtd. by incorporating an acrylic emulsion (contg. carboxyl groups as hydrophilic group and having a carboxyl group content of 1.0-10.0wt%) and a water-soluble amine salt of a 10-20C carboxylic acid (e.g. diethanolamine salt of capric acid) in a water-based pigment ink. The pigment ink has excellent dispersibility and lubricity and can prevent the sinking of ball, the blurring of handwriting and squeaking when used as a ball point pen ink.

Description

Detailed Description of the Invention (Industrial Field 1.1) The present invention relates to an aqueous pigment ink used for writing instruments, recorders, stamps, jet printers, etc. .

(Prior art) Conventionally, when water-based ink is used for writing instruments, especially ballpoint pens, the ball does not rotate smoothly, and the handwriting tends to be blurred or make a raspy sound, resulting in poor writing quality. Ta.

Therefore, attempts have been made to prevent the above-mentioned tendency by adding a surfactant, but commercially available surfactants have a low HLB of 4 and are insoluble in water, making them difficult to use. Also, some species produce pigment berries on the contrary.

The same can be said of polymeric carboxylic acids, which also have lubricity.

Furthermore, although polymeric alcohols and metal soaps have lubricating properties, they also destabilize the pigment dispersion system in the water-based ink.

(Object of the invention) The present invention does not impair the dispersion stability of the pigment ink,
The purpose is to provide lubricity.

(Structure of the Invention) That is, the gist of the present invention is a water-based pigment ink characterized by containing an acrylic emulsion and a water-soluble amine salt of a carboxylic acid having 10 to 20 carbon atoms. It is.

The acrylic emulsion has a carboxyl group as a hydrophilic group, and the content of the carboxyl group is 10 to 10.
．． 0% by weight, preferably 1° to 50% by weight1
It's evil.

As the amine salt of a carboxylic acid having 10 to 20 carbon atoms, the following salts of carboxylic acid and amine are used in an amount of 01 to 10% by weight, preferably 0.1 to 5% by weight (as the amount of carboxylic acid).

Examples of carboxylic acids include capric acid, undenolic acid, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, liluin, timer, oleoyl sarcosone, naphthenic acid, nonylphenyl acetic acid, etc. Examples of water-soluble amines used include monoethanolamine, sietanolamine, triethanolamine, aminomethylpropatol, aminomethylpropanesiol, and ethylene oxide-added cationic surfactants.

In the above-mentioned salt of an acrylic emulsion, a carboxylic acid having 1 to 20 carbon atoms, and an amine, the resin component of the acrylic emulsion wraps around the pigment, and the hydrocarbon part of the carboxylic acid bonds to the hydrophobic part of the acrylic emulsion. , the amine, which is the water-soluble group of the amine salt of carboxylic acid, is on the outside (water 11
111) and maintains dispersion stability, and since the pigment is double and triple protected and wrapped in a film, it is presumed that lubricity is imparted.

As pigments, commonly available pigments can be used; examples include carbon fluff,
Phthalosoanine Blue (C, 1,74160), Phthalosoanine Green (C, 1,74260), High
Sae o 5 (J (C, I.

11670), Nsazo Yellow GR (C, 1,211
00), Permanentlet 4 R (C, 1, 1233
5), Priantocarmine 6 B (C, 1,1585
0), quinacridone red (C1■, 465°O), etc. can be used, and the amount used is 5 to 20% of the total amount of ink.
Weight percent is preferred.

Incidentally, the amount and ratio of the pigments to be used are selected as appropriate.

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

Preservatives and fungicides such as Sono et al., 1,2-benzisothiazolin-3one, pentachlorophenol, and kleol, anti-fIIA, and various surfactants for adjusting surface tension can be appropriately selected and used.

Especially for ballpoint pen ink, the surface tension is 50-4.
Suitable results are obtained at 5 dyn 7 cm and a viscosity of 3-10 cps (Type B viscometer at 25°C).

Pigment ink is dispersed using a dispersing machine such as a ball mill, roll mill, sand mill, super mill, Quinomil, Attritor, etc. to mix, grind, and disperse.

The thus obtained Mizu 11 Gan Honto ink, especially when used as an ink for a ballpoint pen, allows for smoother writing than ever before, and prevents the ball from sinking, the handwriting from becoming blurred, and the writing from making a bow sound.

(Example) Hereinafter, the present invention will be explained in detail based on Examples, in which "1 part" indicates "part by weight".

``LΔ'' - Carbon black 10.0 parts Ethylene glycol 200 parts Perex OT-P 1.0 parts (Kaoseki 1 Iso・Su), anionic surfactant Tsuno Yurimer ET-410 10.0 parts (Japan 41 Yaku (manufactured by ■, acrylic emulsion) Cera, Ri G S N 2.0 parts (Gifu shellac manufacturing required, shellac) Caustic sorter 01 parts Broxel G Water 5 6.4 + Small*O-ME 5.0 parts Among the above ingredients, dissolve caustic soda in water, then dissolve shellac GIN, Perex 0'r-P1 ethylene glycol, Jurimer BT-410, Broxel GXL,
Add carbon black and stir. After 1 hour, the mixture was ground and dispersed in a ball mill for 20 hours, O-ME was added, kneaded for another 1 hour, coarse particles were removed by filtration, etc.
The black water-based pigment ink is 11).

Example 2 Instead of 0-ME in Example 1, 5 parts of *O-'D g,
Example 1 except that 051 parts of Silicone L7600 (manufactured by Nippon Unicar Co., Ltd., 13, silicone surfactant) was used.
In the same manner as above, a black water-based pigment ink was obtained.

Example 6 Instead of 0-MB in Example 1, *5 parts of 0-TB,
7a-y -NFC-430 (Sumitomo 3M rumor/anti,
A black aqueous pigment ink was obtained in the same manner as in Example 1, except that 0.1 part of the fluorine-based surfactant was used.

Leaving JLI! L! A black water-based pigment ink was obtained in the same manner as in Example 1, except that 10 parts of *C, -M E were used in place of O-ME in Working Example IA1, and the amount of water was reduced by 5 parts.

Example 5 A black aqueous pigment ink was obtained in the same manner as in Example 1 except that 5 parts of *S-ME were used in place of 0-ME in Example 1, Row 1.

Example 6 KIT-Blank 210 (Nippon Kayaku/
A black water-based pigment ink was obtained in the same manner as in Example 1 except for the addition of ``C, 1, +5255'' (manufactured by Kiki Co., Ltd.).

Comparative Example 1 A black water-based pigment ink was obtained in the same manner as in Example 1, except that water was added in the same amount instead of 0-ME in Example 1.

1 animal knee steel Phthalonanine blue 8.0 parts Ethylene glycol 100 parts Propylene glycol 50 parts Jurimer 3EX-12510, [1 part (Japan pure type ■・
(odd, acrylic emulsion) Shellac G B N 1
．． 0 parts (manufactured by Gifu Shellac Manufacturing Co., Ltd., shellac) Broxel B D O, 5 parts (manufactured by Company C, I, preservative) Emulgen A-60 1.0 parts (manufactured by Kao Soap ■, nonionic surfactant A) Acetamide
100 parts Caustic sorter 0.2 parts Water 54.6 groups 0-ME 2.0 *lS A blue water-based pigment ink was obtained in the same manner as in Example 1.

Comparative Example 2 Example 7 except that water was added instead of 0-ME in Example 7.
In the same manner as above, a blue water-based ink was obtained.

Example 8 Brilliant Fart Scarlet 8.0 parts Ethylene Glycol 15.0 parts Tsuyu JJ-MaE 'I' 410 2.0 parts Sera, Ri G
BN 5.0 parts Urea 100 parts Caustic sorter 10 parts Water 590 parts *C-DE 5 parts A red water-based pigment ink was obtained in the same manner as in Example 1.

Comparative Example 6 Example 7 except that water was added instead of C-DB in Example 7.
A red aqueous pigment ink was obtained in the same manner as above.

*Amine salt of carboxylic acid (yi! light effect) The water-based pigment ink obtained in the Examples and Comparative Examples was filled into a ballpoint pen using a stainless steel tip and a carbide ball, and the ball sinking test and blurring test were conducted. are shown in Table-1.

Table-1 1) The hole sinks and the ball sinks at Rasentsuki (writing angle 70°, speed 7 m/
sec, load 710 of) and hit the ball for 200m, and the difference in the ball's appearance after that face was defined as the ball's sinking.

2) - Handwriting on high-quality paper (JIS P-1201 writing paper A) and sensory test.

As described above, the water-based pigment ink of the present invention has excellent dispersibility and lubricity, and is suitable for ballpoint pen inks such as ball sinking,
This prevents blurred handwriting and scratchy sounds.

Patent applicant: Bentel Co., Ltd.

Claims (1)

[Claims] A edema pigment ink comprising an aqueous M i4 ink containing an acrylic emulsion and an aqueous amine salt of a carboxylic acid having 10 to 20 carbon atoms.