JPH0948940A - Metallic-luster color ink - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a metallic-luster color ink which retains good writing functions even after a long storage by compounding a metal powder pigment, a resin, and a specific solvent such as methoxy-2-propanone or propylene glycol dimethoxymethyl ether. SOLUTION: This ink is prepd. by compounding a metal pigment powder, a resin, and a compd. represented by formula I (wherein R<1> and R<2> are each CH3 or COCH3 and R<3> is H or CH3 ) and/or a compd. represented by formula II (wherein X is a group represented by formula III, etc.) pref. in an amt. of 5-90wt.%. These compds. are solvents and neither degrade nor corrode a metal powder, examples being methoxy-2-propanone, ethylene glycol dimethoxymethyl ether, and propylene glycol monomethyl ether acetate. The ink retains a metallic luster for a long term even when stored in a writing utensil and does not cause blur in written lines.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink having an excellent gloss lasting property, in which a sufficient metallic luster appears in a handwriting even after being stored for a long time, and an excellent metallic luster that can be written well even for a writing instrument. It concerns color inks.

[0002]

2. Description of the Related Art A metallic luster color ink contains at least a metallic powder pigment, 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. In this ink, since the specific gravity of the metal powder pigment used is large, the pigment will settle during storage. Therefore, when using it as a writing instrument, the ink storage chamber was directly filled with an agitator (such as a metal ball) for redispersing the settled metal powder pigment and the ink, and the writing instrument was shaken to settle before use. The metal powder pigment was redispersed and used. By the way, since the aromatic hydrocarbon-based organic solvents 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 have low odor and toxicity. It has been proposed in many cases to use as a solvent for ink.

[0003]

The above metallic luster color ink has a problem that the metallic luster decreases with time or the color changes to blackish due to discoloration. When an alicyclic hydrocarbon is used as the solvent, this solvent has poor solubility of the resin, and particularly when used in a writing instrument, the ink does not run out well, or after a long period of storage, blurring occurs or is remarkable. In many cases, there were many problems such as writing being impossible.

[0004]

DISCLOSURE OF THE INVENTION The gist of the present invention is a metallic luster color ink characterized by containing at least a metallic powder pigment, a resin, and a compound represented by Chemical formula 3 and / or Chemical formula 4. is there.

[0005]

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[0006]

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The details will be described below. The metal powder pigment is used as a coloring material that imparts a metallic luster to the handwriting, and includes brass powder and aluminum powder. 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, same N
o. 500, the same No. 600, the same No. 700, same N
o. 5000, the same No. 6000, the same No. 7,000,
Same 3L5, same 3L6, same 3L7, same 4L5, same 4L6,
4L7 (Fukuda Metal Foil & Powder Co., Ltd.), brass powder BS-605, BS-607, Alpaste 240
T, same as 241M (above, manufactured by Toyo Aluminum Co., Ltd.),
Examples thereof include bronze powder P-555 and P-777 (manufactured by Nakajima Metal Foil & Powder Industry Co., Ltd.). Bronze powder offset 3000 Super Rich Gold,
Bronze powder No. 5000, the same No. 7000, Alpaste 240T and 241M can be preferably used from the viewpoint of imparting a strong metallic luster to handwriting. The amount of the metallic powder pigment added is 10 to 40 with respect to the total amount of the metallic luster color ink.
% By weight is preferred. When the amount used is less than 10% by weight, the density of the handwriting tends to decrease, and when the amount used is more than 40% by weight, the viscosity of the ink becomes high and the ink ejection from the pen tip tends to decrease when used as a writing instrument. It is in.

The resin is used to improve the dispersibility of the metal powder pigment, the glossiness of the handwriting, and the fixing property of the handwriting. Examples of the resin that can be used include coumarone resin, xylene resin, phenol resin, and ketone resin, and the amount thereof is preferably 5 to 40% by weight based on the total amount of the metallic luster color ink. 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 when used as a writing instrument, ink ejection from the pen tip tends to decrease.

The compounds represented by Chemical formulas 3 and 4 are used as a solvent, and are excellent solvents which dissolve the resin well and do not adversely affect the metal powder pigment such as deterioration and corrosion after aging. Specifically, methoxy-2-propanone, 4-methoxy-2-butanone, 4-methoxy-2-
Pentanone, 4-methoxy-4-methyl-2-pentanone, ethylene glycol dimethyl ether, ethylene glycol monomethyl ether acetate, ethylene glycol diacetate, propylene glycol dimethyl ether, propylene glycol monomethyl ether acetate, propylene glycol diacetate. These may be used alone or as a mixture of two or more, and it is preferable to add 5 to 90% by weight to the total amount of the metallic gloss color ink. In addition, esters such as butyl acetate and amyl acetate, ketones such as methyl ethyl ketone and methyl isobutyl ketone, alicyclic hydrocarbons such as cyclohexane, methyl cyclohexane, ethyl cyclohexane, and cyclopentane, normal heptane, normal octane, mineral spirits, etc. A solvent such as an aliphatic hydrocarbon may be used for improving the nib dry resistance and adjusting the handwriting dryness. 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 it depends on the type of solvent used and the like, but it is preferable to use it in the range of 0 to 40% by weight based on the total amount of the metallic luster color ink.

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

The metallic luster color ink of the present invention can be obtained by stirring and mixing the above components with a conventionally known stirrer and dissolving them uniformly.

[0012]

It is not clear why the metallic luster color ink according to the present invention improves the luster persistence after aging, but it is presumed as follows. The deterioration of gloss and discoloration after long-term storage are due to the deterioration of the metal powder pigment due to the organic solvent, the deterioration of the metal powder pigment due to the resin, and the deterioration of only the resin in the ink to lose the gloss. It is considered that there are many causes of the decrease in gloss due to the interaction between the organic solvent and the metal 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. Solubility of organic solvent in resin is
The presence of oxygen in the organic solvent molecule improves. However,
When oxygen in the organic solvent molecule is an alcoholic hydroxyl group, the organic solvent accelerates the alteration of the metal powder pigment. The compounds represented by Chemical formulas 3 and 4 used in the present invention have oxygen in the molecule which is carbonyl-based oxygen or ether-based oxygen.
It is one of the few general-purpose solvents that has good solubility in resins and can satisfy the two requirements of not degrading the metal powder pigment. Therefore, the present metallic luster color ink exhibits excellent metallic luster even after being stored for a long period of time, and does not cause blurring in the handwriting.

[0013]

The present invention will be described below in more detail with reference to examples. Example 1 Bronze powder offset 3000 Super Rich Gold (brass powder pigment, manufactured by Degussa Japan Co., Ltd.) 25 parts by weight Esclon V120 (coumarone-indene resin, manufactured by Nippon Steel Chemical Co., Ltd.) 30 parts by weight 4-methoxy-4 -Methyl-2-pentanone 45 parts by weight The above components were stirred with a stirrer for 4 hours to obtain a golden metallic luster color ink.

Example 2 Bronze powder offset 3000 Super Rich Gold (described above) 30 parts by weight Escron T120 (Coumaron-indene resin, manufactured by Nippon Steel Chemical Co., Ltd.) 20 parts by weight Ethylene glycol monomethyl ether acetate 28 parts by weight Normal heptane 22 By weight The above components were treated in the same manner as in Example 1 to obtain a golden metallic luster color ink.

Example 3 Bronze powder offset 3000 Super Rich Gold (described above) 25 parts by weight Resin AP (ketone resin, manufactured by Huls, Germany) 30 parts by weight Dipropylene glycol diacetate 45 parts by weight In the same manner, a golden metallic luster color ink was obtained.

Example 4 Bronze Powder Offset 3000 Super Rich Gold (described above) 15 parts by weight Esclone V120 (described above) 20 parts by weight Methylcyclohexane 15 parts by weight 4-Methoxy-4-methyl-2-pentanone 50 parts by weight The above components were carried out. In the same manner as in Example 1, a golden metallic luster color ink was obtained.

Example 5 Bronze powder No. 7000 (brass powder pigment, manufactured by Fukuda Metal Foil Powder Co., Ltd.) 25 parts by weight Escron G90 (coumarone-indene resin, manufactured by Nippon Steel Chemical Co., Ltd.) 30 parts by weight 4-methoxy-2-butanone 35 parts by weight Mineral Spirit 10 parts by weight The above components were treated in the same manner as in Example 1 to obtain a golden metallic luster color ink.

Example 6 Bronze Powder Offset 3000 Super Rich Gold (previously mentioned) 25 parts by weight Esclone V120 (previously mentioned) 30 parts by weight Propylene glycol dimethyl ether 45 parts by weight The above ingredients were stirred for 4 hours with a stirrer to give a golden metallic luster color ink. Got

Example 7 Bronze Powder Offset 3000 Super Rich Gold (described above) 30 parts by weight Escron T120 (described above) 20 parts by weight Propylene glycol monomethyl ether acetate 28 parts by weight Normal heptane 22 parts by weight Same as Example 1 A golden metallic luster color ink was obtained.

Example 8 Bronze Powder Offset 3000 Super Rich Gold (above) 25 parts by weight Resin AP (above) 30 parts by weight Ethylene glycol diacetate 25 parts by weight Ethylene glycol monomethyl ether acetate 20 parts by weight The above components were the same as in Example 1. Then, a golden metallic luster color ink was obtained.

Example 9 Bronze Powder Offset 3000 Super Rich Gold (described above) 15 parts by weight Esclone V120 (described above) 20 parts by weight Methylcyclohexane 15 parts by weight 4-Methoxy-2-butanone 50 parts by weight The above components are the same as in Example 1. Then, a golden metallic luster color ink was obtained.

Example 10 Bronze powder No. 7000 (previously mentioned) 25 parts by weight Eskron G90 (previously mentioned) 30 parts by weight 4-methoxy-4-methyl-2-pentanone 20 parts by weight ethylene glycol dimethyl ether 20 parts by weight mineral spirit 5 parts by weight The above components were prepared in the same manner as in Example 1. To obtain a golden metallic gloss ink color.

Example 11 Bronze Powder Offset 3000 Super Rich Gold (previously mentioned) 25 parts by weight Esclone V-120 (previously mentioned) 30 parts by weight Propylene glycol monomethyl ether acetate 45 parts by weight The same components as in Example 1 were used to prepare a golden metal. A glossy color ink was obtained.

Example 12 Bronze powder offset 3000 Super Rich Gold (described above) 35 parts by weight Escron T120 (described above) 30 parts by weight Ethylene glycol diacetate 40 parts by weight The same components as in Example 1 were used to prepare a golden metallic luster color ink. Got

Example 13 Bronze powder offset 3000 Super Rich Gold (previously mentioned) 30 parts by weight Resin AP (previously mentioned) 30 parts by weight Ethylene glycol monomethyl ether acetate 40 parts by weight The same components as in Example 1 were used to obtain a golden metallic luster color. I got ink.

Example 14 Bronze Powder Offset 3000 Super Rich Gold (above) 35 parts by weight Esclone V-120 (above) 20 parts by weight Propylene glycol monomethyl ether acetate 35 parts by weight Ethylene glycol dimethyl ether 10 parts by weight The above components were combined with Example 1 In the same manner, a golden metallic luster color ink was obtained.

Example 15 Bronze powder No. 7000 (previously described) 25 parts by weight Escron G90 (previously described) 30 parts by weight propylene glycol monomethyl ether acetate 35 parts by weight ethylene glycol dimethyl ether 10 parts by weight The above components were treated in the same manner as in Example 1 to obtain a golden metallic luster color ink.

Example 16 Alpaste 240T (aluminum powder pigment, manufactured by Toyo Aluminum Co., Ltd.) 25 parts by weight Esclone V-120 (described above) 20 parts by weight 4-methoxy-4-methyl-2-pentanone 30 parts by weight methylcyclohexane 25 parts by weight The above components were treated in the same manner as in Example 1 to obtain a silver metallic luster color ink.

Example 17 Alpaste 241M (aluminum powder pigment, manufactured by Toyo Aluminum Co., Ltd.) 30 parts by weight Esclone V-120 (described above) 25 parts by weight propylene glycol monomethyl ether acetate 25 parts by weight mineral spirits 10 parts by weight normal heptane 10 Parts by weight The above components were treated in the same manner as in Example 1 to obtain a silver metallic luster color ink.

Example 18 Alpaste 240T (described above) 30 parts by weight Resin AP (described above) 20 parts by weight Propylene glycol monomethyl ether acetate 10 parts by weight 4-methoxy-2-pentanone 10 parts by weight Methylcyclohexane 30 parts by weight The above components were carried out. A silver metallic luster color ink was obtained in the same manner as in Example 1.

Example 19 Alpaste 240T (previously described) 25 parts by weight Esclone V-120 (previously described) 30 parts by weight Ethylene glycol monomethyl ether acetate 30 parts by weight 4-methoxy-2-butanone 15 parts by weight In the same manner, a silver metallic luster color ink was obtained.

Comparative Example 1 A gold metallic luster color ink was obtained in the same manner as in Example 1 except that 4-methoxy-4-methyl-2-pentanone was removed and xylene was added in that amount. .

Comparative Example 2 A gold metallic luster color ink was obtained in the same manner as in Example 2 except that ethylene glycol monomethyl ether was removed and methylcyclohexane was added in that amount.

Comparative Example 3 A gold metallic luster color ink was obtained in the same manner as in Example 11 except that propylene glycol monomethyl ether acetate was removed from Example 11 and ethylene glycol monomethyl ether was added in that amount.

Comparative Example 4 The procedure of Example 12 was repeated except that ethylene glycol diacetate was removed and methylcyclohexane was added in that amount.
In the same manner as in Example 12, a golden metallic luster color ink was obtained.

Comparative Example 5 A silver metallic luster color ink was obtained in the same manner as in Example 16 except that 4-methoxy-4-methyl-2-pentanone was removed from Example 16 and xylene was added in that amount. .

Comparative Example 6 A silver metallic luster color ink was obtained in the same manner as in Example 17, except that propylene glycol monomethyl ether acetate was removed from Example 17 and mineral spirit was added.

Using the metallic luster color inks obtained in Examples 1 to 19 and Comparative Examples 1 to 6 above, a raw ink type (with stirring ball) writing instrument (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.

[0039]

[Table 1]

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

Handwriting Function Writing on a glass plate with a writing instrument filled with the above metallic luster color ink, and visually observing the glossiness of the writing. Evaluation ⊚: Vivid gold or silver with metallic luster. ◯: A color that looks golden or silver, and a metallic luster. Δ: A color similar to gold or silver, no metallic luster. X: There is discoloration and no metallic luster.

[0042]

As described above in detail, the metallic luster color ink according to the present invention shows sufficient metallic luster in handwriting in the handwriting function even when stored for a long time, and also in the writing function. It is an excellent metallic gloss ink that does not cause blurring.

Claims (1)

[Claims] 1. A metal powder pigment, a resin, and And / or A metallic luster color ink containing at least the compound shown in.