JPS5975967A - Fluorescent color ink for writing utensil - Google Patents

Abstract

PURPOSE:To provide the titled ink free from gelation and reactivity to copper metals, by incorporating aliphatic amides in a fluorescent pigment. CONSTITUTION:A fluorescent color ink for writing utensils which comprises fluorescent pigments [e.g.; Shinroihi Color FM11 (red-orange), 12 (green), or 13 (red)], aliphatic amides (e.g., Armide 18), resins (e.g., phenolic resin), and org. solvents (e.g., xylene) at the least. So far, when oily fluorescent color inks were charged in writing utensils in which copper or copper-contg. metal parts are used fluorescent pigments in the ink were apt to react with copper with the lapse of time to cause gelation of inks. By incorporating aliphatic amides, prevention of the gelation and excellent prolonged stability are achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluorescent ink for writing instruments, and more particularly to a fluorescent ink for writing instruments that is reactive with copper or metals containing copper.

In recent years, writing instruments filled with an oil-based fluorescent ink in which fluorescent pigments are dispersed in an organic solvent have attracted attention because of their water resistance and the ability to write on a wide variety of objects. or,
A writing instrument filled with an ink obtained by adding titanium oxide to the above-mentioned ink is attracting more attention because it has added concealability to the above-mentioned advantages. On the other hand, copper, or metals containing copper such as nickel silver and brass have been used as the material for the metal members used in the above-mentioned writing implements from the viewpoint of workability and cost. However, when the above-mentioned oil-based fluorescent ink is filled into a writing instrument that uses the above-mentioned copper or a metal member containing copper, the firefly/light pigment in the ink reacts with the copper over time, causing the ink to gel. It had problems such as storage.

The present inventors have conducted extensive research to solve the above problem, and have found that by adding an aliphatic amide to the oil-based fluorescent ink described above, the reactivity between copper and the fluorescent pigment is significantly reduced. Heading 1 completes the present invention. That is.

The gist of the present invention is a fluorescent ink for a writing instrument using copper or a metal member containing copper, which comprises at least a fluorescent pigment, an aliphatic amide, a resin, and an organic solvent.

It is not clear why the fluorescent ink for writing instruments of the present invention prevents gelation due to reaction with copper as much as possible, but it is speculated as follows.

A possible cause of the gelation of the ink is that the copper ions liberated in the ink and the basic dye, which is the main component of the fluorescent pigment, react in some way, causing the ink to gel. It is thought that the aliphatic amide used causes some kind of reaction with the liberated copper ions, and either prevents the copper ions from reacting with the basic dye, or has some kind of function to prevent copper ionization as much as possible. .

Each component of the present invention will be explained in detail below. Fluorescent pigments are used to give vivid color tones to handwriting, and a specific example is Shinroi Hika-5-FM11 (
red orange).

12 (green), 13 (red), 14 (orange), M2S (lemon yellow), 16 (orange yellow), 17 (pink).

Same 18 (Blue), Same 25 (Grinissinie U-),
Same 27 (Magenta), Same 1o3 (Red No.

104 (orange), 105 (lemon yellow)
, 106 (orange yellow), 107 (pink)
, 108 (sky blue) (and above).

made by Shinroihi ■), MPI50 (red-orange), MPI501 (made by
green), 5o3 (red), 5o4 (orange), 5o
o5 (yellow), 5o6 (yellow-orange).

There are 507 (pink), 508 (blue), and 5070 (pink) (manufactured by Nippon Hyouko Kagaku ■), and these can be used alone or in combination.

The amount used is preferably 1 to 50% by weight based on the total amount of ink, and from the viewpoint of one color tone and viscosity, 5 to 40% by weight is more preferable.

Aliphatic amide reduces the reactivity of fluorescent pigments with copper,
As a result, it is used for the purpose of preventing gelation of ink as much as possible, and a specific example is Aramide 18.
Same HT, Same C1 Same 0. Armowax EBS (and above)
Lion Armor (manufactured by ■), Killeslide C (manufactured by Killest Chemical ■), etc., and the amount used is preferably 0.01 to 5.0% by weight based on the total amount of ink, and less than 0.011% by weight. The effect is weak, and even if the amount is more than 5.0% by weight, no effect beyond that of keratosis can be observed, which is disadvantageous in terms of cost.

The resin is used to improve the fixation of handwriting and to adjust the viscosity of the ink, and various oil-soluble resins can be used; examples include:
Gum rosin, maleic acid resin, alkyd resin, phenolic resin.

There are ketone resins, acrylic resins, terpene resins, aromatic hydrocarbon resins, etc., and these can be used alone or in combination.The amount used varies depending on the type of resin 9 degree of polymerization, etc., but it is based on the total amount of ink. 1 to 50% by weight is preferred. If it is less than 1% by weight, the fixation of handwriting on the surface to be written will not be sufficient, and if it is more than 50% by weight, the viscosity of the ink will become high, which tends to cause blurred handwriting, clogging of the pen tip, etc.

5- The organic solvent can be selected as appropriate depending on the material used for the writing surface and other materials used, but examples include alcoholic solvents such as methyl alcohol, ethyl alcohol, isopropyl alcohol + n-butyl alcohol,
These include glycol ether solvents such as methyl cellosolve, ethyl cellosolve, inpropyl cellosolve, and butyl cellosolve, ester solvents such as ethyl acetate, butyl acetate, and amyl acetate, and aromatic solvents such as toluene and xylene. They can be used in combination, and the amount used is preferably 50 to 90% by weight based on the total amount of ink.

In addition to the above ingredients, white pigments such as titanium oxide can be added as necessary to increase the hiding power of handwriting, and other surfactants, rust preventives, complementary color dyes, etc. can also be used as appropriate. It is.

Next, the method for manufacturing the ink of the present invention will be briefly described6-1. Ru.

The ink of the present invention can be easily obtained by mixing the above-mentioned components in the required amounts (adding titanium oxide and other additives as necessary), stirring thoroughly with a dispersion machine such as a ball mill, and dispersing the mixture. can.

Hereinafter, the present invention will be explained in more detail with reference to Examples. In the examples, "parts" indicate "parts by weight."

Example 1 Nunroihikara-FM17 (Pink 1 pigment.

Shinroihi (stock system) 1
60 parts Killeslide C (aliphatic amide).

Chrest Chemical (Preparation)
05 parts Betsukosol 1308 (alkyd resin.

Oguchi Ink Chemical Industry Co., Ltd. 2. Q section Nitrocellulose'/8 (Cellulose 9 conductor.

HER, 0ULES IN 0ORPORATED) 30 parts Butyl acetate 5
8.0 parts Kinren 10.0
Titanium oxide A-220 (anatase type titanium oxide.

Ishihara Sangyo (production)
11.0 parts The above ingredients were placed in a small experimental ball mill and stirred at room temperature for 72 hours to disperse.

A pink fluorescent ink was obtained.

Comparative Example 1 Same as Example 1 except that Killeslide O was excluded from the ingredients in Example 1.
In the same manner as above, a pink fluorescent ink was obtained.

Comparative example 2 Among the components of Example 1, Killeslide C was excluded.

A pink fluorescent ink was obtained in the same manner as in Example 1, except that 13TL (benzotriazole, rust preventive) was added accordingly.

Example 2 MPI304 (orange fluorescent pigment.

Nippon Fluorochemicals (preparation) 1
60 parts aamide (aliphatic amide).

Lion Armor Co., Ltd. 1.0 part Malkidokai 2 (Malein iH1 fat) q,
o part Methyl isobutyl ketone 200 parts n-propyl alcohol 160 parts Kinren 200 parts Titanium oxide R.8
20H (Rutile type titanium oxide.

Ishihara Sangyo (production)
21.0 parts The above ingredients were placed in a small experimental ball mill and stirred and dispersed at room temperature for 72 hours to obtain an orange fluorescent ink.

Comparative Example 3 An orange fluorescent ink was obtained in the same manner as in Example 2, except that Aamide 18 was removed from the ingredients in Example 2.

Comparative example 4 Among the components of Example 2, Aamide 18 was excluded.

An orange fluorescent ink was obtained in the same manner as in Example 2, except that BTL was added accordingly.

9- Above, Examples 1 and 2. Table 1 shows the results of the reactivity test with metal parts for the inks obtained in Comparative Examples 1 to 4.

Table-1 *1. Reactivity test example 1.2 with metal members. A test tube with a stopper was filled with 10 g of the ink obtained in Comparative Examples 1 to 4.

A total of 18 pieces were made, 3 pieces each, each made of copper and nickel silver.

A brass metal member (a cylindrical piece with a diameter of 5 M and a height of 15 mm) was placed and left in a constant temperature bath at 70°C for 7 days. After 78 days, the state of the ink was visually observed, and it was compared with before and after aging. An item with no change was rated as ○, an item with a slight change compared to before aging was rated as △, and an item where the ink had gelled and completely changed color was rated as ×.

As described above, even when the fluorescent ink for writing instruments of the present invention is filled into a writing instrument made of copper or a metal member containing copper, the ink does not gel over time.

It has excellent stability over time.

Patent applicant: Pentel Co., Ltd. 11-

Claims (1)

[Claims] In a writing instrument using copper or a metal member containing copper,
A fluorescent ink for writing instruments comprising at least a fluorescent pigment, an aliphatic amide, a resin, and an organic solvent.