JPH0267379A - Screen printing ink - Google Patents

Abstract

PURPOSE:To prepare a screen printing ink which does not form bubbles even when passing through a mesh and which gives an even, uniform printed surface, by compounding a vehicle compsn. contg., as main constituents, a carboxylic acid (ester) of a terpenoid and an ammonium or amine salt of a carboxylic acid. CONSTITUTION:A vehicle compsn. contg., as main constituents, a carboxylic acid (ester) of a terpenoid (e.g., rosin) and an ammonium or amine salt of an aliphatic carboxylic acid of the formula CnH2n+1COOH (n is 1,2,3...) (e.g., ammonium decanoate) is used.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to screen printing inks containing a vehicle composition.

Conventional technology Compositions of carboxylic acids and their esters belonging to terpenoids include rosin, guaiac, Canadian balsam,
It is known as dammaru, a natural resin produced by plants. These have traditionally been used as paints in the form of varnishes, and their performance has received a certain level of praise, and they are widely used on an industrial scale. It is also contained as a vehicle and is mainly used in high-temperature baking inks for screen printing inks due to its good printability and good compatibility with pigments and solvents.

Problems to be Solved by the Invention Carboxylic acids and their esters belonging to terpenoids, which are commercially available and can be used, or their compositions have problems that are caused by bubbles generated when ink passes through the mesh of a screen plate during printing. However, there was a problem in that it was very difficult to obtain a smooth and even printed film surface.

Means for Solving the Problems In the present invention, a vehicle of the general formula CnH is added to a terpenoid carboxylic acid, its ester, or a composition thereof.
2n+1Cool (n='+, 2, 3.・----
The above-mentioned problem is solved by mixing the ammonium salt of the aliphatic carboxylic acid represented by -) or the salt with an amine.

Effect 1 shipman CnH,, n+1 COOH (n= 1.2.3
Ammonium salts of aliphatic carboxylic acids or salts with amines represented by , . Most of it dissolves, but a small portion precipitates in the form of very fine particles, giving the composition the effect of containing a pigment. This imparts thixotropic properties to the ink, allowing it to be transferred onto the printing substrate without generating bubbles even when the ink passes through the mesh during printing.

Therefore, it is possible to obtain a very smooth and even printed film surface.

Example First, an overview of the present invention will be explained.

Terpenoid carboxylic acids that can be used in the present invention include those contained in natural resins, such as abietic acid and its derivatives, such as pimaric acid, neoabietic acid, and levopimaric acid, as well as guaiaconic acid and its derivatives, guaiacic acid, These include lupenic acid. Furthermore, dammarolic acid and its derivatives, urnolic acid, oleanolic acid, betulinic acid, etc. contained in dammar gum can also be used.

Most monoterpenoid carboxylic acids are liquid at room temperature, so they cannot be used alone, but they may be used if mixed with the aforementioned diterpenoid or triterpenoid carboxylic acids. These are generally difficult to obtain purified and separated and are expensive, so natural resins containing them such as rosin, guaiac, Canadian balsam, dammar, copal, etc. can be used. Natural resins such as these can be used without any problem for the purpose of the present invention, although their components vary widely depending on the region of production and manufacturer, and they may contain components other than carboxylic acids. As these esters, abietic acid esters can mainly be used, and any type of rosin ester that is generally commercially available may be used.

One shipman CnH2n10, C0OH (n = 1.2, 3.
The ammonium salts of aliphatic carboxylic acids or the salts with amines represented by the above formula can be synthesized by neutralizing these acids with ammonia or amines. There is also no particular limit to the value of n. However, if an acid with a short alkyl group, such as acetic acid, is used, the number of carbon atoms in the amine to be reacted with it must be increased, or conversely, if an acid with a long alkyl group is used, the number of carbon atoms in the amine to be reacted with it must be decreased. It is necessary to This means that it gives salt both inorganic salt properties and organic properties. Therefore, for amines, all types of primary, secondary, and tertiary, as well as aliphatic and aromatic.

Although any type of heterocyclic compound can be used, it is desirable to take this into consideration when determining the number of carbon atoms contained in the alkyl group.

Next, specific examples will be described.

(Example 1) 10C1 of vehicles were prepared with the composition shown in Table 1, and 10C of a mixture of indium 2-ethylhexanoate and tin 2-ethylhexanoate in a weight ratio of 96=4 was added. Then, 30g of tetralin was added as a solvent and kneaded.
Screen printing inks for forming transparent electrodes of various compositions were manufactured. These inks were applied onto a glass substrate in a size of 1010 mm using a 250 mesh screen plate with an emulsion thickness of 16 μm.
Printing was performed on a rectangular pattern of x30. This printing material was dried at 150'C for 30 minutes, and the surface of the printed film was evaluated. The evaluation was based on two points: the presence or absence of unevenness on the film surface, the sagging of the pattern edges, and the presence or absence of bubbling during printing.

These evaluation results are also shown in Table 1. As can be seen, when the ink contains an ammonium salt of aliphatic carboxylic acid or a salt with an avant, there is no bubbling during printing, resulting in a good printed film surface. The composition in which this effect appears varies depending on the type and composition of the terpenoid carboxylic acid used, but from the results in Table 1, the minimum amount of these salts necessary to obtain a good ink is ammonia, It can be seen that primary amines, secondary amines, and tertiary amines increase in this order, and tend to increase as the number of carbon atoms in the amine increases.〇 (Example 2) Table 2 shows that Prepare a vehicle with the following composition, add 13F of a mixture of lead 2-ethylhexanoate and tetra-n-butyl titanate in a molar ratio of 1:1, add 3Of of α-terpineol as a solvent, and knead. Then, inks for forming lead titanate thin films having various compositions were manufactured. The results of evaluating these inks in the same manner as in Example 1 are also shown in Table 2. From this, it can be seen that, as in Example 1, the ink with the vehicle containing the ammonium salt of aliphatic carboxylic acid or the salt with amines gives a good film surface. It can also be seen from Table 2 that the minimum amount of these salts that must be included in the vehicle to obtain a good printing ink increases as the number of carbon atoms in the amine increases.

(Left below) (Example 3) 10 oy of vehicle was prepared with the composition shown in Table 3, and cadmium 2-ethylhexanoate and tin 2-ethylhexanoate were mixed in a molar ratio of 1:1. 15g of the same were added, and 3Of of butyl cellosolve was added as a solvent and kneaded to produce inks for forming transparent electrodes of various compositions. The results of evaluating these inks using the same method as in Example 1 are also shown in Table 3. From this it can be seen that an ink with a vehicle containing ammonium salts of aliphatic carboxylic acids or salts with amines gives a good printing surface, and the minimum amount of these salts that should be contained in the vehicle to obtain a good printing ink. is found to increase as the number of carbon atoms in the aliphatic carboxylic acid increases.

(Left below) (Example 4) 100g of vehicle was prepared with the composition shown in Table 4, and 1(l) of a mixture of indium nitrate and soot chloride in a molar ratio of 93=7 was added. 3.Of butyl cellosolve was added as a solvent and kneaded to produce inks for forming transparent electrodes of various compositions.The results of evaluating these inks using the same method as in Example 1 are also shown in Table 4. Similarly to the above-mentioned examples, it was found that an ink with a vehicle containing an ammonium salt of an aliphatic carboxylic acid or a salt with an amine gave a good printed film surface.

(Left below) (Example 5) A vehicle of 100 dah was prepared with the same composition as in Example 1, and ruthenium 2-ethylhexanoate and barium 2-ethylhexanoate were mixed in a molar ratio of 1:1. 3 CI of acetophenone as a solvent was added and kneaded to produce inks for forming resistors of various compositions. These inks were evaluated using the same method as in Example 1, and the results are shown in Table 6.

As in the above-mentioned examples, it was found that ink with a vehicle containing an ammonium salt of an aliphatic carboxylic acid or a salt with an amine gave a good printed film surface, demonstrating its effectiveness.

(Left below) (Example 6) A vehicle 1oof was prepared with the same composition as in Example 2, and iron loacetylacetonate and cobalt (II) acetylacetonate were mixed in a molar ratio of 1:1. 12
Then, 30 Da of isophorone was added as a solvent and kneaded to produce inks for forming magnetic thin films of various compositions. When these inks were evaluated in the same manner as in Example 1, the results shown in Table 6 were obtained. As in the above-mentioned examples, it was found that ink with a vehicle containing an ammonium salt of an aliphatic carboxylic acid or a salt with an amine gave a good printed film surface, demonstrating its effectiveness.

(Margin below) As can be seen from the above examples, the pigment-free screen printing ink containing the vehicle composition of the present invention greatly improves the properties of the printed film surface, and the amount of fat to be added is The amount of ammonium salt of group carboxylic acid or salt with amine varies depending on the metal compound contained as a film-forming agent, but if this amount is appropriately adjusted, a good screen printing ink can be obtained regardless of the combination of compounds. This is the result.

Effects of the Invention As can be seen from the above examples, the screen printing ink containing the vehicle composition of the present invention can provide an even and smooth printed film surface, and has great industrial effects. .

Claims (1)

[Claims] terpenoid carboxylic acid or their ester and the general formula C_nH_2_n_+_1COOH (n=1,
A screen printing ink comprising a vehicle composition whose main component is an ammonium salt of an aliphatic carboxylic acid or a salt with an amine represented by 2, 3, ...).