JP3104413B2 - Water-based pigment ink for writing instruments - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has an ink container,
The present invention relates to a water-based pigment ink for a writing implement used for a writing implement in which the ink in the ink storage unit can be visually recognized from the outside. In particular, it is suitable for a raw ink type ballpoint pen, marking pen and the like.

[0002]

2. Description of the Related Art Conventionally, a writing implement has a so-called ink in which a pen tip is attached to one end of a shaft cylinder which is a writing instrument main body, an ink accommodating portion is formed inside the shaft cylinder, and ink in the ink accommodating portion is led out to the pen tip. A so-called refill type, in which a built-in writing instrument or a barrel having an ink container inside and a pen tip attached to one end (so-called refill) is inserted into and fixed to the barrel as the writing instrument body. Something like a writing instrument.

[0003] In the above-mentioned writing implement, the barrel of the writing implement main body and the barrel of the refill are formed of a transparent or translucent material, or one of the barrels, so that the remaining ink amount can be checked from the outside. A transparent or translucent part is known.

[0004] Aqueous ink used for such writing instrument, what as a colorant using a dye, as a main component and a dye and water, those using pigments, and water pigment and dispersant The main component. Furthermore, when the writing implement to be used is a raw ink type ballpoint pen, a polymer substance for viscosity adjustment (thickening) is an essential component.

When a dye is used as a coloring material, light incident on the liquid ink in the ink storage unit is absorbed by the dye. For this reason, when viewed from the outside of a writing instrument, for example, blue, green, yellow-green, sky blue, purple, and brown inks are hard to distinguish from black inks, and orange and pink inks are distinguished from red inks. It is hard to stick.

[0006] Even when a pigment is used as a coloring material,
Depending on the type of pigment, the absorption of incident light is greater than reflection,
The color of the ink in the ink container may be very different from the handwriting. This is remarkable when a phthalocyanine-based blue pigment is used. Therefore, the color of the ink is displayed by making the tail plug, the cap, and the like the same color as the handwriting, and the color of the ink is not displayed by the color of the ink in the ink storage unit.

[0007]

However, in particular,
The barrel of the writing instrument body and the barrel of the refill are made of a transparent or translucent material, or a part of the barrel is made transparent or translucent so that the remaining amount of ink can be checked from the outside. When the above-described ink is used for a writing instrument, even if the colors of the inks in the ink storage section are different, it is difficult to distinguish the inks from each other, resulting in poor aesthetic appearance and low display effect at a store or the like. In addition, there is a problem that the tail plugs and caps must be arranged in each color, which tends to increase the cost.

Accordingly, an object of the present invention is to provide a water-based pigment ink for writing implements in which the color of the ink in the ink storage section looks almost the same as the handwriting from the outside.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a water-based pigment ink for a writing implement used for a writing implement which has an ink storage section and in which the ink in the ink storage section can be visually recognized from the outside. Ink pigment is benign
It consists of Ginello G and phthalocyanine blue
The weight ratio of Benzidine Yellow G and phthalocyanine blue 3: 7 to 7: 3 Der is, furthermore, the amount of pigment is writing instrument
The writing instrument aqueous pigment ink according to claim 14 to 16 wt% der Rukoto against water base pigment ink total amount it is an gist.

The details will be described below. The writing implement having an ink storage section and allowing the ink in the ink storage section to be visually recognized from the outside is a so-called ink built-in type in which the ink storage section is formed directly in the shaft cylinder that is the writing tool main body as described above. Alternatively, a so-called refill type in which the inside of the barrel is an ink storage portion, and a refill having a pen tip attached to one end is inserted and fixed in the barrel, which is the writing instrument body, may be used. Furthermore, an ink storage body such as a fiber converging body may be arranged in the ink storage unit. In order to make the ink in the ink storage unit visible from the outside of the writing instrument, it is necessary to form the main body barrel with a transparent or translucent material in the case of the so-called ink built-in type, and in the case of the refill type ,
It is necessary to form the refill and the writing instrument body with a transparent or translucent material. Of course, only a part of the refill or the writing instrument body may be transparent or translucent.

The transparent or translucent material includes polypropylene, polystyrene, methacrylic resin, polyethylene, polyphenylene ether resin, polyphenylene sulfide resin, polycarbonate, polybutadiene,
Ionomer resin, vinyl chloride resin, cellulose acetate resin,
Polysulfone resin, polymethylpentene, polyethylene terephthalate, polyamide, polybutylene terephthalate, ethylene vinyl acetate copolymer, acrylonitrile
Butadiene / styrene copolymer resin, acrylonitrile /
Transparent or translucent thermoplastic resins such as styrene copolymer resins and fluororesins can be used.

The refill and the barrel of the writing instrument main body may have not only a circular cross section but also an irregular shape such as an ellipse or a square.

[0013] Used in the aqueous pigment ink for writing implementsPigment
IsBenzidine Yellow GWhenPhthalocyanine blueAnd heavy
Mixed in a ratio of 3: 7 to 7: 3 by volumeThe writing implement for water
14 to 16% by weight based on the total amount of the pigment ink.
If the mixing ratio is outside the above range, the ink in the ink
Since the color of the handwriting differs greatly from the color of the handwriting,
Can not achieve the purpose.

Water is used as a medium for the ink. That
The amount used is 40 to 100% of the total amount of the aqueous pigment ink for writing implements.
95% by weight is preferred.

[0015] The dispersant disperses the pigment in the ink.
A conventionally known low molecular weight anionic or
Nonionic surfactant and styrene-acrylic acid copolymer
Soluble in solids, styrene-maleic acid copolymer
Metal salt, ammonium salt, amine salt of type polymer
Can be used. The amount used is water-based for writing instruments
0.1 to 10% by weight based on the total weight of the ink
No.

[0016] In addition to the above essential components, moisturizing or freezing prevention
For methanol, ethanol, propano
Alcohols such as toluene and isopropanol, ethylene glycol
Coal, diethylene glycol, triethylene glycol
, Propylene glycol, 1,3-butylene glycol
, Glycols such as thiodiglycol, ethylene glycol
Coal monomethyl ether, ethylene glycol monoe
Tyl ether, ethylene glycol monobutyl ether
, Ethylene glycol monomethyl ether acetate
G, diethylene glycol monomethyl ether, diethyl
Lenglycol monoethyl ether, N-methyl-2-
Pyrrolidone, sorbit, sorbitan, acetin, gly
Water-soluble organic solvents such as serine alone or as a mixture of two or more
Can be used.

Further, urea, thiourea, ethylene urea and
Are known moisturizing aids such as these derivatives, methylcell
Loin, carboxymethylcellulose, hydroxyethyl
Rucellulose, hydroxypropylcellulose, pullula
, Xanthan gum, tragacanth gum, guar gum, ara
Water-soluble natural polymer such as bia rubber, polyvinyl alcohol
Tools, sodium polyacrylate, polyacrylamide,
Water-soluble synthetic polymer materials such as ethylene oxide
Viscosity modifier, aqueous resin emulsion, aqueous resin microphone
You can use handwriting protectants such as
You.

Others, preservative, fungicide, rust inhibitor, pH control
Additives such as stabilizers, fragrances, defoamers, etc.
May be used as a mixture of two or more.

The aqueous pigment ink for a writing instrument of the present invention
Various methods for producing known aqueous pigment inks may be employed.
Can be. For example, use a ball mill,
Kisa, sand grinder, speed line mill, three
By mixing and grinding with a disperser such as a roll mill
Easily obtained.

[0020]

[ Function ] Benzidine yellow G is the ratio of absorbing incident light.
The ratio of reflection is higher. Therefore, incident on the ink
Light is reflected by Benzidine Yellow G,
As it rises, phthalocyanine has a high ratio of absorbing incident light
Excellent color visibility when viewed from the outside, even when mixed with Ninblue
It is presumed that the ink has been used.

[0021]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples.
However, in the Examples and Comparative Examples, the term "parts"
Part).

Example 1 Phthalocyanine Blue 4.2 parts Benzidine Yellow G 9.8 parts Ammonium salt of styrene-acrylic acid copolymer 8.0 parts Ethylene glycol 15.0 parts Glycerin 5.0 parts Guar gum (viscosity modifier) 0.5 part Benzotriazole (rust inhibitor ) 0.2 part Proxel GXL (preservative) 0.1 part Sodium hydroxide (pH adjuster) 0.3 part Water 56.9 parts Of the above components, other than guar gum Mix ingredients and bowl
Disperse in a mill for 24 hours. In addition, guar gum
And the dispersion process is performed again for 3 hours. Then fill
Coarse particles are removed with a filter or the like, and the viscosity is set to 245 cps (25
C) of a green pigment-based water-based pigment ink for a writing instrument.

Example 2 phthalocyanine blue 9.8 parts Benzidine yellow G 4.2 parts Styrene-acrylic acid copolymer ammonium salt 8.0 parts Ethylene glycol 15.0 parts Glycerin 5.0 parts Guar gum (viscosity modifier) 0.5 parts of benzotriazole (rust) 0.2 parts proxel GXL (preservative) 0.1 part of sodium hydroxide (pH adjustment agent) 0.3 parts water 56.9 parts the above components as in example 1 Similarly, the viscosity is 260c
ps (25 ° C) green pigment-based water-based pigment ink
Was.

Example 3 Phthalocyanine Blue 7.0 parts Benzidine Yellow G 7.0 parts Ammonium salt of styrene-acrylic acid copolymer 8.0 parts Ethylene glycol 15.0 parts Glycerin 5.0 parts Guar gum (viscosity modifier) 0.5 parts of benzotriazole (rust) 0.2 parts proxel GXL (preservative) 0.1 part of sodium hydroxide (pH adjustment agent) 0.3 parts water 56.9 parts the above components as in example 1 Similarly, the viscosity is 250c
ps (25 ° C) green pigment-based water-based pigment ink
Was.

Example 4 Phthalocyanine Blue 8.0 parts Benzidine Yellow G 8.0 parts Ammonium salt of styrene-acrylic acid copolymer 6.0 parts Ethylene glycol 17.0 parts Glycerin 6.0 parts Benzotriazole (rust inhibitor) 0.2 part Proxel GXL (preservative) 0.1 part Sodium hydroxide (pH adjuster) 0.3 part Water 54.4 parts The above components were mixed and dispersed in a ball mill for 24 hours.
Perform After that, remove coarse particles with a filter etc.
4.5-cps (25 ° C) green water-based writing implement
A pigment ink was obtained.

Comparative Example 1 Phthalocyanine Blue 2.8 parts Benzidine Yellow G 11.2 parts Ammonium salt of styrene-acrylic acid copolymer 8.0 parts Ethylene glycol 15.0 parts Glycerin 5.0 parts Guar gum (viscosity modifier) 0.5 parts of benzotriazole (rust) 0.2 parts proxel GXL (preservative) 0.1 part of sodium hydroxide (pH adjustment agent) 0.3 parts water 56.9 parts the above components as in example 1 Similarly, the viscosity is 240c
ps (25 ° C) green pigment-based water-based pigment ink
Was.

Comparative Example 2 Phthalocyanine Blue 11.2 parts Benzidine Yellow G 2.8 parts Ammonium salt of styrene-acrylic acid copolymer 8.0 parts Ethylene glycol 15.0 parts Glycerin 5.0 parts Guar gum (viscosity modifier) 0.5 parts of benzotriazole (rust) 0.2 parts proxel GXL (preservative) 0.1 part of sodium hydroxide (pH adjustment agent) 0.3 parts water 56.9 parts the above components as in example 1 Similarly, the viscosity is 265c
ps (25 ° C) green pigment-based water-based pigment ink
Was.

Comparative Example 3 Phthalocyanine Blue 3.2 parts Benzidine Yellow G 12.8 parts Ammonium salt of styrene-acrylic acid copolymer 6.0 parts Ethylene glycol 17.0 parts Glycerin 6.0 parts Benzotriazole (rust inhibitor) 0.2 part of Proxel GXL (preservative) 0.1 part Sodium hydroxide (pH adjuster) 0.3 part Water 54.4 parts The above components were made in the same manner as in Example 1, and the viscosity was 4.3 c.
ps (25 ° C) green pigment-based water-based pigment ink
Was.

Comparative Example 4 Phthalocyanine Green 14.0 parts Ammonium salt of styrene-acrylic acid copolymer 8.0 parts Ethylene glycol 15.0 parts Glycerin 5.0 parts Guar gum (viscosity modifier) 0.5 part Benzotriazole ( Rust inhibitor ) 0.2 part Proxel GXL (preservative) 0.1 part Sodium hydroxide (pH adjuster) 0.3 part Water 56.9 parts Among the above components, components other than guar gum are mixed, and ball
Disperse in a mill for 24 hours. In addition, guar gum
And the dispersion process is performed again for 3 hours. Then fill
Removes coarse particles with a tar, etc., and is an aqueous pigment for green writing instruments.
An ink was obtained.

The above Examples 1 to 3 and Comparative Examples 1, 2, and 4
The ink obtained in the above is a commercially available ball which is a refill type writing instrument.
Pen (hybrid, product code: K105, Pentel
Co., Ltd., ink storage material is polypropylene, body shaft
The cylinder material is acrylonitrile-styrene copolymer resin.
And both are transparent. ) And filled in Example 4 and ratio
The water-based ink obtained in Comparative Example 3 is a writing instrument with a built-in ink.
Commercially available aqueous fluorescent marker (Exo Data Checker,
Product code: SL25, manufactured by Pentel Co., Ltd., ink storage unit
Material: transparent with polypropylene).

From the appearance, the color tone of the ink was visually checked.
Was. Examples 1-4: The color tone was the same as that of handwriting. Comparative Examples 1 and 3: Handwriting color is the color of the ink in the ink storage unit
Yellowish color is stronger than. Comparative Example 2: The color of the ink in the ink storage unit was compared to the color of the handwriting.
It is blackish. Comparative Example 4: The color of the ink in the ink storage unit is black compared to the handwriting
It looks like.

[0032]

As described in detail above, the present invention
Water-based pigment ink for writing implements allows the ink to be viewed from outside
When used for a good raw ink type writing instrument,
The color of the ink and the color of the handwriting are very similar. Follow
The ink in the ink container has the color display function of the writing implement.
As well as excellent ink color visibility
And if the display effect at the store is high and the aesthetic appearance is good
It has such advantages.

[0033]

[0034]

[0035]

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) C09D 11/00-11/20 CA (STN)

Claims (1)

(57) [Claims] 1. A water-based pigment ink for a writing instrument used for a writing instrument having an ink storage section and allowing the ink in the ink storage section to be visually recognized from the outside, wherein the pigment of the water-based pigment ink for a writing instrument is benzidine yellow G. Phthalocyan
Made of Ninblue , this benzidine yellow G and lid
The weight ratio of the Russian Nin blue is 3: 7 to 7: are three der,
Furthermore, the amount of the pigment is in proportion to the total amount of the aqueous pigment ink for writing instruments.
Writing instrument aqueous pigment ink according to claim 14 to 16 wt% der isosamples to.