JPS5915455A - Pigment composition - Google Patents

Abstract

PURPOSE:To provide a pigment compsn. which has high gloss, gravure printability and excellent stability with time and transparency, by blending a higher fatty acid-modified silicone oil with a pigment in a specified ratio. CONSTITUTION:0.01-1wt% higher fatty acid-modified silicone oil is blended with a pigment. Examples of pigments are org. pigments such as azo pigment, condensed azo pigment and phthalocyanine pigment and inorg. pigments such as carbon black, titanium oxide, chrome yellow and zinc oxide. Examples of the higher fatty acid-modified silicone oils are silicon oil modified with higher fatty acids such as palmitic or stearic acid. When the amount of the oil is less than 0.01wt%, little effect can be obtd., while the amount exceeds 1wt%, there are disadvantages that the tinting power and degree of color development are reduced and the fitness as the ink is lost.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pigment composition that has high gloss, excellent stability over time, and transparency, and is suitable for gravure printing.

Conventionally, to improve the abrasion resistance of printed matter, polyethylene waxes are generally added in an amount of 1 to 3% by weight based on the pigment in the ink, but although this method improves the abrasion resistance compared to products without additives, , the gloss is significantly reduced, the tinting power is reduced,
It has the disadvantage that the degree of color development also decreases.

In addition, the most effective way to significantly improve the gloss of gravure ink, which is one of the printing inks, is to
Processed pigments called chips are used by kneading nitrocellulose or polyamide resin and pigments in the presence of a small amount of plasticizer and aromatic or aliphatic solvent using a powerful dispersion machine such as a roll mill or dough mixer. Often.

However, the disadvantage of this method is that it requires chipping and inking processes, and the operations are complicated.In particular, the chipping process requires a long time for the powerful kneading process, which increases work and energy costs. There was also the problem that the price was high, and that nitrocellulose chips had a very high risk of catching fire during kneading.

As a way to overcome these drawbacks, the present inventor has conducted intensive research to utilize various surface treatment agents such as organic titanium compounds, silane coupling agents, surfactants, and modified silicone oils for the surface treatment of pigments, and has developed a special method. By applying an appropriate amount of modified silicone oil to the face 1, we succeeded in developing an excellent pigment composition for use in gravure inks, etc., which has extremely excellent gloss, transparency, and stability over time without reducing fastness to friction.

That is, pigments treated with 0.01-11-1 parts by weight or 0.05-0.5% by weight of higher fatty acid-modified silicone oil such as oleic acid or stearic acid can be dispersed using a normal ball mill, sand mill, etc. By simply converting it into ink using a machine, it is possible to obtain excellent gravure ink, etc., which has extremely high gloss, transparency, stability over time, good dispersibility, and density that is equivalent to or better than that obtained using conventional chips. I discovered that it can be done.

According to the present invention, a high-quality pigment that can replace expensive chips can be easily produced at a low cost, which is extremely advantageous industrially.

Pigments used in the present invention include soluble and insoluble azo pigments, condensed azo pigments, phthalocyanine pigments, quinacridone pigments, isoindolinone pigments, perylene/perinone pigments, dioxazine pigments, vat dye pigments, and base pigments. Examples include organic pigments such as color dye pigments, and inorganic pigments such as carbon blank, titanium oxide, yellow lead, cadmium yellow, cadmium red, Bengara, iron black, zinc white, navy blue, and ultramarine blue.

The higher fatty acid-modified silicone oil according to the present invention is a silicone oil modified with higher fatty acids such as palmitic acid, stearic acid, oleic acid, linoleic acid, and lylunic acid, and fl is KF910. X-22-800,
FX-3935 (modified silicone oil manufactured by Shin-Etsu Chemical)
etc. can be used. The higher fatty acid-modified silicone oil is used in an amount of 0.01 to 1% by weight based on the pigment. 0.01% by weight
If it is less than 1% by weight, the effect of the higher fatty acid-modified silicone oil will be small, and if it exceeds 1% by weight, disadvantages such as a decrease in coloring power and degree of color development and loss of ink suitability will occur.

If you use normal silicone oil or modified silicone oil other than higher fatty acids instead of strained higher fatty acid-modified silicone oil, it is difficult to obtain a good pigment composition because thickening, color development damage, coloring, and kinging occur significantly.

In the present invention, an example of the method of adding and treating the modified silicone oil is as follows.

In other words, the method of addition is to spread the higher fatty acid modified Noricon oil as it is, dilute it with a solvent, and add water little by little in the presence of a surfactant while stirring at high speed to emulsify the pigment. Added during manufacturing. At the time of pigment production, for example, in the case of an azo pigment, it may be added to the coupler solution or diazo solution before the coupling reaction,
It may be added to the slurry after coupling. Practically speaking, it is desirable to add it to the pigment slurry after the reaction.

As a treatment method, for example, a pigment thriller containing higher fatty acid-modified silicone oil is used at 40 to 90°C for 0.5~
Heat and stir for 1 hour.

As mentioned above, one example of the addition and treatment method of the modified silicone oil has been shown, but the method is not limited to this, and it can also be added during, during, or after the production of ink or paint.

Other additives and the like can be added to the pigment composition of the present invention, if necessary.

The pigment composition of the present invention is useful as coating materials for printing inks and paints, and provides coating materials with high gloss, excellent stability over time, and transparency. Furthermore, by applying the pigment composition of the present invention to an aqueous coating material, such as an aqueous gravure ink, an aqueous coating material excellent in stability over time, transparency, hiding power, etc. can be obtained.

Next, the present invention will be specifically explained with reference to Examples. In the text, "1 part" and "%" indicate parts by weight.

Example 1 25.3 parts of 3.3-dichlorobenzidine was tetrazotized by a known method, and this was added to an aqueous solution containing 35.5 parts of acetoacetanilide to perform a coupling reaction, resulting in a suspension containing 1263 parts of Pigment Yellow. I got it.

Add higher fatty acid denatured silicone oil (X
-22-800 (manufactured by Shin-Etsu Chemical Co., Ltd.), 2 parts of a nonionic surfactant (HLB 14 or higher) was added, and 48 parts of water was gradually poured in while stirring with a high-speed stirrer to create a 2% emulsion 6. Add .2 parts (0.2% of active ingredient based on pigment). Thereafter, the water-containing cake was left at 40°C for 1 hour, filtered and washed in a conventional manner, and the resulting water-containing cake was dried at 60 to 70°C and pulverized to form the pigment composition 6 of the present invention.
I got 3 copies.

Using the obtained pigment composition, an ink was formed and tested as described below.

[Example of ink formulation]

10 2-inch steel balls in a 1-ton porcelain pocket
0 and mixture A in Table 1, dispersed for 20 hours (confirm with a tube gauge that the coarse particles are 20μ or less), added formulation B, and mixed for another 1 hour. did.

In addition, the higher fatty acid modified Noricon oil of Example 1 was not used, but 0.41% of polyethylene wax (PW2010 manufactured by Toyo Petrolite Co., Ltd.) was added to the pigment and kneaded.
An ink was prepared in the same manner using a pigment composition prepared in the same manner as Reference Example 1. Furthermore, an ink was prepared using a chip formed from the pigment composition of Reference Example 1 using a two-roll mill, and Reference Example 2 And so.

Table 1 [Ink formulation] The dark color ink obtained as described above was adjusted under certain conditions and printed on treated OPP film using a gravure printing machine. The items were evaluated.

-! In addition, the dark ink is stored separately under certain conditions,
The stability of the viscosity over time was also compared.

Table-〇Evaluation Results Example 2 1)-) 19 parts of luidine m-sulfonic acid was diazotized by a known method, and this was added to an aqueous alkaline solution of beta-acrylic acid and 19 parts of phthoic acid to perform a coupling reaction. , add calcium chloride water solution to make a lake, Big X Trend 57:14
A suspension containing 2.4 parts was obtained.

42.5 parts of a pigment composition was treated in the same manner as in Example 1 by adding 4.2 parts of a two-thick emulsion of higher fatty acid-modified silicone oil prepared in advance (0.2% in terms of active ingredient based on the pigment). I got it.

When the obtained pigment composition was tested in the same manner as in Example 1, it was found to be excellent in color development, gloss, transparency, stability over time, etc.

Example 3 100 parts of crude copper phthalocyanine blue was dissolved in concentrated sulfuric acid (concentration 7
8%), poured into 10,000 parts of water, filtered and washed with water, and finely dispersed the resulting water-containing cake in water using a high-speed stirrer.
9. 2% emulsion (manufactured by Shin-Etsu Chemical Co., Ltd.) containing 2 parts.
2 parts (0.2% in terms of active ingredient based on the pigment) were added and treated in the same manner to obtain 92 parts of a pigment composition. When the obtained pigment composition was tested in the same manner as in the examples, good results were obtained.

Example 4 100 parts of crude copper 7 talocyanine bull was ground in a test kneader at 110 to 110°C for 5 hours with 1000 parts of common salt as a grinding agent and 110 parts of polyethylene glycol as a grinding aid. After purifying the dough with diluted hydrochloric acid and hot water, the water-containing cake is finely dispersed in water using a high-speed stirrer.
A suspension containing 92 parts of ρ type steel phthalocyanine blue was obtained. In the same manner as in Example 1, 9.2 parts of a 2% emulsion of higher fatty acid-modified silicone oil prepared in advance (0.2% as an active ingredient based on the pigment) was added and treated in the same manner, resulting in 92 parts of a pigment composition. I got it. The obtained pigment composition was prepared in Example 1.
When tested in the same manner as above, good results were obtained.

Dissolve 100 parts of crude steel phthalocyanine green in 1000 parts of sulfuric acid (98 parts%) and add
The mixture was poured into 100 parts of water, filtered and washed with water, and the resulting water-containing cake was finely dispersed in water using a high-speed stirrer to obtain a suspension containing 100 parts of copper phthalocyanine green. This suspension was treated in the same manner as in Example 1 to obtain 100 parts of a pigment composition. When the obtained pigment composition was tested in the same manner as in Example 1,
Good results were obtained.

Example 6 A suspension of a water-containing cake containing 100 parts of a commercially available titanium dioxide pigment was finely dispersed in water using a high-speed stirrer, and 2 parts of higher fatty acid-modified silicone oil prepared in advance in the same manner as in Example 1 was added.
% emulsion 10 parts (active ingredient equivalent to pigment 0.2
%) and treated in the same manner to obtain 100 parts of a pigment composition. When the obtained pigment composition was tested in the same manner as in Example 1, good results were obtained.

Patent applicant: Toyo Ink Manufacturing Co., Ltd.

Claims (2)

[Claims] (1) Consists of pigment and higher fatty acid-modified silicone oil, with 0.0% higher fatty acid-modified silicone oil per pigment.
A pigment composition characterized in that it is used in an amount of 1 to 1% by weight. (2) The pigment composition according to claim 1, wherein the pigment is an organic pigment.