JP3391046B2 - Monoazo lake pigments and pigment dispersions - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monoazo lake pigment which is useful as a pigment for various applications, especially for printing inks and paints , and a pigment dispersion containing the pigment. More specifically, it relates to a monoazo lake pigment having improved mechanical dispersibility and dispersibility such as wetting , and a pigment dispersion using the pigment.

[0002]

2. Description of the Related Art Monoazo lake pigments obtained by coupling an aromatic amine having a soluble group as a diazo component and β-oxynaphthoic acid, β-naphthol, etc. as a coupler component are used for coloring printing inks, paints and plastics. Widely used for various purposes such as. These monoazo lake pigments have been treated with rosin in order to make the color tone transparent and clear and to improve the dispersibility.
This rosin treatment is usually carried out by adding an alkali salt solution of rosin (so-called rosin soap) to a coupler component or a dye, and then adding a metal salt for lakes such as calcium chloride to the rosin as an insoluble rosin lake metal salt. It is a method of precipitating.

The above-mentioned rosin treatment has the excellent effects of finely controlling the particle shape of the pigment, improving the transparency and sharpness, and suppressing the aggregation as a coating material for the pigment to improve the dispersibility. . However, it cannot be said that the conventional treatment methods are sufficiently effective. In particular, powder powder for offset uses a large amount of rosin of 10 to 30 wt% with respect to the pigment in order to improve dispersibility. However, the use of a large amount of rosin is accompanied by many harmful effects such as a decrease in the coloring power of the ink, a decrease in the fluidity, and a decrease in printability due to poor water resistance.

[0004]

Therefore, there has been a demand for a surface treatment technique for efficiently coating a pigment with a small amount of rosin.
The present invention provides a monoazo lake pigment having excellent dispersibility even with a small amount of rosin treatment, a method for producing the same, and a pigment dispersion.

[0005]

The present invention is directed to a monoazo lake pigment obtained by lake-forming an azo dye obtained by coupling a diazonium salt of an aromatic amine having a soluble group and a coupler component, and a rosin coating the monoazo lake pigment. and hydrolysis of sulfosuccinates represented by the following formula 1
It is composed of decomposition products , and the amount of rosin is based on the azo dye.
3 to 30% by weight of the sulfosuccinate
The amount of degradants is 1 to 15% by weight, based on the above azo dye, for the coated monoazo lake pigment. The present invention further relates to a pigment dispersion comprising the above coated monoazo lake pigment and a vehicle. Formula 1

[Chemical 2] (Wherein, R is an alkyl group of C ₈ ~C _18, X is Na, K,
Indicates NH ₄ . )

The monoazo lake pigment of the present invention is obtained by lakeizing a dye obtained by coupling a diazo component obtained by diazotizing an aromatic amine with a coupler component. In the present invention, as the aromatic amine having a soluble group,
For example, 1-amine-4-methylbenzene-2-sulfonic acid (p-toluidine-m-sulfonic acid), 1-amino-4-methyl-5-chlorobenzene-2-sulfonic acid,
1-amino-4-chloro-5-methylbenzene-2-sulfonic acid, 1-amino-4-methylbenzene-3-sulfonic acid, 1-amino-3-methylbenzene-4-sulfonic acid and the like are exemplified. .

[0007] The coupler component is typically β-oxynaphthoic acid, but may be β-naphthol or acetoacetanilide. Further, it may be a derivative of the above coupler component, for example, a compound substituted with a lower alkyl group, an alkoxy group or a halogen atom.

The monoazo lake pigment of the present invention can be carried out according to a conventionally known method for producing a monoazo lake pigment.
That is, an aromatic amine having a soluble group is diazotized, while a coupling liquid is prepared from a coupler component, both are mixed and coupled, and a metal salt is added to the obtained dye to form a lake. Alternatively, a metal for lake formation may be added in advance to the diazo component and / or the coupler component for coupling. Examples of the lake metal include calcium, barium, strontium, manganese and the like.

The present invention is characterized in that a sulfosuccinate is dispersed in a water-soluble salt of rosin and added to the rosin to efficiently coat the surface of the pigment. Further, the scan Ruhokohaku salt you Yes <br/> characterized in that the removal by alkaline hydrolysis. The sulfosuccinate may be previously dispersed in a water-soluble salt of rosin, such as sodium salt, potassium salt, or ammonium salt, and added to the coupler component, the dye, or the pigment. Sulfosuccinates of the present invention are those represented by the following formula 1.

Equation 1

[Chemical 3] (Wherein, R is an alkyl group of C ₈ ~C _18, X is Na, K,
Indicates NH ₄ . )

In the coated monoazo lake pigment of the present invention, for example, a sulfosuccinate is added to a water-soluble salt of rosin, and the mixture is stirred and dispersed in a temperature range of 20 to 40 ° C., and this dispersion is dispersed in a monoazo lake dye. In addition, a rake metal is added in the temperature range of 10 to 90 ° C. to form a lake. Since sulfosuccinates reduces significantly the surface tension when the remaining, 50 ° C. at pH12.0 more
As described above, the mixture is heated and stirred to carry out alkali hydrolysis to deactivate it.
The amount of rosin used is 3 to 30% by weight, preferably 10 to 25% by weight, based on the dye. The amount of sulfosuccinate used is 1 to 15% by weight, preferably 3 to
It is 10% by weight. Sulfosuccinates are
It is added in the range of 5 to 100% by weight, preferably 10 to 100% by weight.

The present invention provides a pigment dispersion in which a pigment is dispersed in a vehicle for printing ink, a vehicle for paints and the like. Vehicles for printing inks are, for example, rosin-modified phenolic resins, petroleum resins, alkyd resins for offset inks,
Alternatively, 20 to 50 parts by weight of a resin such as a dry oil modified resin, 0 to 30 parts by weight of a vegetable oil such as linseed oil, tung oil, soybean oil, n-paraffin, isoparaffin, aromatech,
It comprises 10 to 60 parts by weight of a solvent such as naphthene or α-olefin. This offset ink vehicle is blended with the coated monoazo lake pigment of the present invention, and other known ink solvents, dryers, leveling improvers, thickeners and other known additives are appropriately blended to obtain a printing ink composition. It

Vehicles for gravure ink include, for example, gum rosin, wood rosin, tall oil rosin, calcified rosin, lime rosin, rosin ester, maleic acid resin,
Gilsonite, dammar, shellac, polyamide resin,
Vinyl resin, nitrocellulose, cyclized rubber, chlorinated rubber,
Ethyl cellulose, cellulose acetate, ethylene-vinyl acetate copolymer resin, urethane resin, polyester resin,
Resins such as alkyd resins or mixtures thereof 10-50
30 parts by weight of solvent such as n-hexane, toluene, ethanol, methanol, acetone, ethyl acetate, ethyl lactate, cellosolve, diacetone alcohol, chlorobenzene, ethyl ether, acetal ethyl ether, ethyl acetoacetate, butyl cellosolve acetate. Consists of parts. 3 to 35 parts by weight of the monoazo lake pigment of the present invention, barium sulfate, barium carbonate,
Calcium carbonate, gypsum, white alumina, clay, silica,
0 to 20 parts by weight of extender pigment such as silica white, talc, calcium silicate, and precipitated magnesium carbonate is added, and other auxiliary agents such as a plasticizer, a UV inhibitor, an antioxidant and an antistatic agent are appropriately added. A gravure ink composition.

The vehicle for paint is, for example, acrylic resin, alkyd resin, epoxy resin, chlorinated rubber, vinyl chloride, synthetic resin emulsion, silicone resin, water-soluble resin, polyurethane, polyester, melamine resin, urea resin or a mixture thereof 80. .About.20% by weight and 60 to 10% by weight of a solvent such as hydrocarbon, alcohol, ketone, ether alcohol, ether, ester and water. A paint is prepared by adding 0.1 to 15% by weight of the pigment of the present invention and 0 to 30% by weight of other auxiliary agents and extender pigments to 99.9 to 55% by weight of the vehicle for coating material.

[0015]

The present invention will be described in more detail based on the following examples. In the examples, "parts" means "parts by weight" and "%" means "% by weight" unless otherwise specified. Example 1 (Reference Example) 1-Amino-4-methylbenzene-2-sulfonic acid 9
0.6 parts, 2.9 parts of 1-amino-4-methylbenzene-3-sulfonic acid and 1.8 parts of 2-aminonaphthalene-1-sulfonic acid were added to a solution consisting of 1500 parts of water and 20 parts of sodium hydroxide. Dissolve. To this, 124 parts of 35% hydrochloric acid is added, and after acid precipitation, 1000 parts of ice is added and cooled to 0 ° C. Water 10
Add a solution consisting of 0 part and 35 parts sodium nitrite and add 3 parts.
The mixture was stirred for 30 minutes at a temperature of not higher than 0 ° C to obtain a diazo component.

95 parts of β-oxynaphthoic acid was added to 3000 parts of water.
And a solution of 51 parts of sodium hydroxide,
What was cooled to 15 ° C was used as the coupler component. The diazo component was added dropwise to the coupler component over 20 minutes, the coupling reaction was allowed to proceed, and the dye was obtained by stirring for 30 minutes. Next, equation 1
10.6 parts (5% based on the dye) of sulfosuccinate lipase 870P (manufactured by Lion Corp.) corresponding to 8% of 25% rosin soap (10% based on the dye) was added and dispersed at 40 ° C. This sulfosuccinic acid-rosin dispersion was added to the above dye and the pH was adjusted to 11.5 with 1% sodium hydroxide. To this, 300 parts of 35% calcium chloride aqueous solution was added, and stirring was continued for 1 hour to complete the lake formation reaction. The pH at this time was 11.0. This was heated to 80 ° C., filtered, washed with water, dried and pulverized to obtain 250 parts of a monoazo lake pigment.

Example 2 4.0 was added to the slurry after the lake reaction in Example 1 was completed.
PH of 12.2 by adding sodium hydroxide in parts,
A monoazo lake pigment was obtained in the same manner as above.

Comparative Example 1 For comparison, 2 was used instead of the sulfosuccinic acid-rosin dispersion.
127.2 parts of 5% rosin soap (15% based on the dye) was used to obtain a monoazo lake pigment which was operated in the same manner as in Example 1.

An offset ink test of the pigments obtained in Examples 1 and 2 and Comparative Example 1 was carried out. The vehicle used is 200 parts of linseed oil 20 parts and No. 5 solvent (Nippon Oil Co., Ltd. ink solvent) to 50 parts of Tamanol 361 (Arakawa Chemical Co., Ltd. rosin modified phenolic resin),
It was heated to 0 ° C. and dissolved. The following test was carried out by adding 2 parts of aluminum octylate to 98 parts of this vehicle to prepare a vehicle for offset ink.

70 parts of a vehicle for dispersible offset ink is put in a paper cup,
20 parts of each pigment was added to this, and mixed and stirred so as to be uniform to prepare a premix ink. When this premixed ink is continuously rolled with three rolls, the pigment of Comparative Example 1 becomes 3
Coarse particles disappeared in the pass, whereas coarse particles disappeared in the two passes in the pigments of Examples 1 and 2. This means that the dispersibility was improved. In addition, the transparency of these inks showed almost no difference by visual judgment.

Clarity 0.5 g of the three-roll continuous color dark ink was mixed with 2.0 g of white ink containing titanium oxide to prepare a light color ink.
When color measurement was performed with a color machine, the Munsell C value was 11.96 in Comparative Example 1, while 12.3 in Example 1.
5 and Example 2 were 12.26. This means that the sharpness is improved.

Gloss when the ink adjusted to have a gloss tack of 9.0 to 9.5 is color-printed on art paper, the gloss of the pigment of Example 1 is + 5.2% as compared with the pigment of Comparative Example 1, and Example 2 Pigment is + 4.7%
And had a high gloss.

Offset printability test An ink extraction water containing a water-soluble component obtained by emulsifying the ink in water was prepared, and the surface tension was measured. The pigment of Comparative Example 1 was 63.8 dyne / cm. The pigment of Example 1 is 4
The surface tension was greatly reduced to 3.3 dyne / cm. This is due to the remaining sulfosuccinate. On the other hand, the pigment of Example 2 had an improved surface tension of 71.4 dyne / cm. This means that the sulfosuccinate was alkali-hydrolyzed and inactivated by the heat treatment at 80 ° C. at pH 12.0. Example 2 is preferred for offset printing.

[0024]

[0025]

[0026]

[0027]

[0028]

[0029]

Since the monoazo lake pigment of the present invention is coated with rosin and sulfosuccinate, the color vividness is improved, and the dispersibility in various vehicles is improved as compared with the conventional pigment coated with only rosin. Also improves the gloss of the film. Furthermore, the sulfosuccinate hydrolyzed and coated with rosin improves the hydrophobicity of the pigment surface in addition to the above effects, and when used as an offset ink, emulsifies in fountain solution. Since there is little tendency to do so, printed matter without printed stains can be produced.

─────────────────────────────────────────────────── --Continued from the front page (56) Reference JP-A-48-79832 (JP, A) JP-A-2-132161 (JP, A) JP-A-3-163169 (JP, A) JP-A-63- 120764 (JP, A) JP 61-272271 (JP, A) JP 2-294363 (JP, A) JP 51-116827 (JP, A) JP 63-225668 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) C09B 67/00

Claims (2)

(57) [Claims] 1. A monoazo lake pigment prepared by lakeizing an azo dye obtained by coupling a diazonium salt of an aromatic amine having a soluble group and a coupler component, a rosin coating the monoazo lake pigment, and a rosin represented by the following formula 1.
It consists hydrolyzate of sulfosuccinic acid salt, the LOGIS
The amount of the amine is 3 to 30% by weight based on the above azo dye.
The amount of sulfosuccinate hydrolyzate is
1 to 15% by weight of coated monoazo lake pigment. Formula 1 (Wherein, R is an alkyl group of C ₈ ~C _18, X is Na, K,
Indicates NH ₄ . ) 2. A pigment dispersion comprising the coated monoazo lake pigment obtained in claim 1 and a vehicle.