JPH0940900A - Golden ink for writing tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a golden ink for a writing tool showing metallic luster sufficient for handwriting in handwriting function even after long-term preservation, causing no blurring, etc., in handwriting function. SOLUTION: This golden ink for a writing tool comprises 10-40wt.% of a brass powder pigment, 5-40wt.% of a resin such as coumarone-indene resin and 1-50wt.% of an N-alkyl-2-pyrrolidone such as N-methyl-2-pyrrolidone, N- ethyl-2-pyrrolidone, N-propyl-2-pyrrolidone, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golden ink for a writing instrument, which is capable of excellent writing even after being stored for a long period of time, and which has a sufficient metallic luster in handwriting and which is excellent in gloss lasting. Is.

[0002]

2. Description of the Related Art A gold ink for writing instruments contains at least a gold pigment such as gold powder such as aluminum powder and brass powder, a resin and an organic solvent. As the organic solvent, aromatic hydrocarbons such as xylene and toluene have been widely used because of their low price and high solubility in resins. This ink has a large specific gravity of gold pigments such as gold powder and brass powder that are used in gold color, so that the pigments settle out during storage. Therefore, when using it for writing instruments, when filling the ink directly in the ink storage chamber of the writing instrument, fill it with a stirring ball for redispersion, shake the writing instrument before use, and re-settling the precipitated pigment. It was used dispersedly. by the way,
Since the aromatic hydrocarbons that have been conventionally used as described above have problems such as high odor and toxicity, in recent years, cycloaliphatic hydrocarbons such as methylcyclohexane and ethylcyclohexane, which have low odor and toxicity, have been used as ink solvents. Many have been suggested for use.

[0003]

The above-mentioned golden ink for a writing instrument, which uses an aromatic hydrocarbon as an organic solvent, may have a reduced metallic luster of the handwriting or become dark in color when stored for a long period of time. There was a problem of doing.
Further, the one using an alicyclic hydrocarbon as the organic solvent,
Due to the low solubility of alicyclic hydrocarbons in resin, when it is stored for a long period of time, ink viscosity increases, resin deposits, etc., causing scratches on the handwriting There was a problem that it could not be done.

[0004]

DISCLOSURE OF THE INVENTION The gist of the present invention is a gold ink for a writing instrument, which comprises at least a brass powder pigment, a resin, and N-alkyl-2-pyrrolidone.

The details will be described below. The brass powder pigment is a pigment made of a copper-zinc based metal alloy, and is used as a coloring material that gives a handwriting a golden color tone and a metallic luster. An example of a commercially available product is Bronze Powder Offset 3000 Super Rich Gold (manufactured by Degussa Japan Co., Ltd.) Bronze Powder No. 50, the same No. 60, the same No. 70, No. 70. 500, the same No. 600, same N
o. 700, the same No. 5000, the same No. 6000, the same No. 7,000, 3L5, 3L6, 3L7, 4
L5, 4L6, 4L7 (Fukuda Metal Foil Powder Co., Ltd.), brass powder BS-605, BS-607 (Toyo Aluminum Co., Ltd.), bronze powder P
-555, P-777 (Nakajima Metal Foil & Powder Industry Co., Ltd.)
Manufactured by Bronze Powder Offset 3000 Super Rich Gold, Bronze Powder No. 5000, the same No. 7000 can be preferably used from the viewpoint of imparting a strong metallic luster to handwriting.
The amount of the brass powder pigment used is preferably 10 to 40% by weight with respect to the total amount of the golden ink for writing instruments. If the amount used is less than 10% by weight, the density of handwriting tends to decrease, and if the amount used exceeds 40% by weight, the viscosity of the ink tends to be high and the ink ejection from the writing instrument tends to decrease.

The resin is used for improving the dispersibility of the brass powder pigment, improving the glossiness of the handwriting, and improving the fixability of the handwriting. Examples of the resin that can be used include coumarone resin, coumarone-indene resin, xylene resin, phenol resin, and ketone resin, and the amount thereof is preferably added in an amount of 5 to 40% by weight based on the total amount of the golden ink for writing instruments.
If the amount used is less than 5% by weight, the above effect tends to be small, and if it is more than 40% by weight, the viscosity becomes high and the ink ejection from the writing instrument tends to decrease.

N-alkyl-2-pyrrolidone, which is used as a solvent, is an excellent solvent that dissolves a resin well and does not adversely affect the brass powder pigment such as deterioration and corrosion after a lapse of time. Specifically, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, N-propyl-2-pyrrolidone, N-butyl-2-pyrrolidone, N-
Pentyl-2-pyrrolidone, N-hexyl-2-pyrrolidone, N-heptyl-2-pyrrolidone, N-octyl-
2-pyrrolidone, N-nonyl-2-pyrrolidone, N-decyl-2-pyrrolidone, N-dodecyl-2-pyrrolidone and N-ndecyl-2-pyrrolidone may be mentioned. These may be used alone or as a mixture of two or more, and it is preferable to add 1 to 50% by weight to the total amount of the golden ink for writing instruments. Incidentally, ethylene glycol dimethyl ether, ethylene glycol monomethyl ether acetate, ethylene glycol diacetate, propylene glycol dimethyl ether, propylene glycol monomethyl ether acetate, glycols such as propylene glycol diacetate, butyl acetate, esters such as amyl acetate, methyl ethyl ketone, methyl isobutyl. Ketones such as ketones, cycloaliphatic hydrocarbons such as cyclohexane, methylcyclohexane, ethylcyclohexane, and cyclopentane, and solvents such as aliphatic hydrocarbons such as normal heptane, normal octane, and mineral spirits are used to improve the drying resistance of the pen tip and handwriting. It may be used for adjusting the drying property. However, in that case, make sure that the metallic luster of the handwriting after storage for a long period of time does not decrease or the color does not darken, and that the solubility of the resin is not adversely affected. It is necessary to reduce the amount used, and depending on the type of solvent used, etc.,
Preferably, it is used in the range of 50% by weight.

Further, in addition to the above components, if necessary, various antiseptics, antifungal agents, wetting agents, drying inhibitors, viscosity modifiers, freeze stabilizers, defoaming agents, surfactants and the like. It is also possible to appropriately select and use the additive of.

The golden ink for a writing instrument can be obtained by stirring and mixing the above components with a conventionally known stirrer and dissolving them uniformly.

[0010]

The gold ink for a writing instrument according to the present invention has a sufficient golden metallic luster for handwriting even after being stored for a long time.
Moreover, although it is not clear whether or not the handwriting is blurred, it is presumed as follows. The decrease in gloss and discoloration after long-term storage may be due to the deterioration of the brass powder pigment due to the organic solvent, the deterioration of the brass powder pigment due to the resin, or the deterioration of only the resin in the ink to eliminate the gloss. However, most of the causes of the decrease in gloss are the interaction between the organic solvent and the brass powder, and the poor solubility of the organic solvent in the resin. In addition, the blur of the handwriting is the poor solubility of the organic solvent in the resin. The solubility of the organic solvent in the resin is improved when oxygen is present in the organic solvent molecule. However, when the oxygen in the organic solvent molecule is an alcoholic hydroxyl group, the organic solvent accelerates the alteration of the brass powder pigment. Since the oxygen in the molecule of the N-alkyl-2-pyrrolidone used in the present invention is carbonyl oxygen,
It is one of the few general-purpose solvents that has good solubility in resins and that does not alter the properties of brass powder pigments. Therefore, the gold ink for writing instruments has excellent handwriting even after long-term storage. Shows gloss and does not cause scratches on handwriting.

[0011]

The present invention will be described below in more detail with reference to examples. In the examples and comparative examples, the term "part" means "part by weight".

Example 1 Bronze powder offset 3000 Super Rich Gold (brass powder pigment, manufactured by Degussa Japan Co., Ltd.) 30 parts Esclon V120 (coumarone-indene resin, manufactured by Nippon Steel Chemical Co., Ltd.) 30 parts N-ethyl- 2-Pyrrolidone 40 parts The above components were stirred with a stirrer for 4 hours to obtain a golden metallic luster ink.

Example 2 Bronze powder offset 3000 Super Rich Gold (described above) 35 parts Escron T120 (Coumaron-indene resin, manufactured by Nippon Steel Chemical Co., Ltd.) 30 parts N-octyl-2-pyrrolidone 35 parts The above components were carried out. A gold metallic luster ink was obtained in the same manner as in Example 1.

Example 3 Bronze powder offset 3000 Super Rich Gold (described above) 30 parts Resin AP (ketone resin, manufactured by huls, Germany) 30 parts N-hexyl-2-pyrrolidone 40 parts The same components as in Example 1 Then, a golden metallic luster ink was obtained.

Example 4 Bronze powder offset 3000 Super Rich Gold (described above) 35 parts Esclone V120 (described above) 20 parts N-propyl-2-pyrrolidone 35 parts Ethylene glycol dimethyl ether 10 parts The same components as in Example 1 were used. A golden metallic luster ink was obtained.

Example 5 Bronze powder No. 7000 (Brass powder pigment, Fukuda Metal Foil Powder Co., Ltd.) 25 parts Escuron G90 (Coumaron-indene resin, manufactured by Nittetsu Chemical Co., Ltd.) 30 parts Propylene glycol monomethyl ether acetate 35 parts N-octyl-2-pyrrolidone 10 parts The same components as described in Example 1 were used to obtain a golden metallic luster ink.

Comparative Example 1 In Example 1, except for N-ethyl-2-pyrrolidone,
A golden metallic luster ink was obtained in the same manner as in Example 1 except that xylene was added in that amount.

Comparative Example 2 A golden metallic luster ink was obtained in the same manner as in Example 2 except that N-octyl-2-pyrrolidone was removed and methylcyclohexane was added in that amount.

Comparative Example 3 A golden metallic luster ink was obtained in the same manner as in Example 3, except that N-hexyl-2-pyrrolidone was removed and ethylene glycol monomethyl ether was added in that amount.

The golden inks for writing instruments obtained in Examples 1 to 5 and Comparative Examples 1 to 3 were used as raw writing ink instruments (containing a stirring ball) using pen nibs having a fiber core (Pentel White 100WM, Pentel). (Manufactured by Co., Ltd.) and tested for writing function and handwriting function before and after storage. The storage conditions are 6 months in a constant temperature and humidity chamber at a temperature of 50 ° C. and a humidity of 30%. The results are shown in Table 1.

[0021]

[Table 1]

Writing Function Writing was performed on a glass plate with the above-mentioned writing instrument filled with the golden ink, and the presence or absence of scratches on the handwriting was visually observed. Evaluation ○: No blurring ×: There is blurring

Handwriting function Writing on a glass plate with the writing instrument filled with the above gold ink, the glossiness of the handwriting was observed visually. Evaluation ⊚: Bright golden color with metallic luster. ◯: A color that looks golden, with metallic luster. Δ: Color similar to gold, no metallic luster. X: There is discoloration and no metallic luster.

[0024]

As described above in detail, the metallic luster ink for a writing instrument according to the present invention exhibits a sufficient golden metallic luster in the handwriting in the handwriting function even when stored for a long period of time, and the writing It is an excellent golden ink for writing instruments that does not cause blurring in function.

Claims (1)

[Claims] 1. A brass powder pigment, a resin, and an N-alkyl-
A golden ink for a writing instrument, which comprises at least 2-pyrrolidone.