CS254624B1 - The phthalocyanine-based pigment preparation and the process for its production - Google Patents

Abstract

Pigment preparation based on beta-modified copper phthalocyanine containing by weight 67.5 to 95.9% of beta-modified copper phthalocyanine, 4.0 to 30.0% of a compound or mixture of compounds of the general formula RCONH(CH2)nOH (I), 0.05 to 1.0% of a compound or mixture of compounds of the general formula RCOO(CH2)nNH2 (II) and 0.05 to 1.5% of an acid of the general formula RCOOH (III), where R represents an aliphatic saturated or unsaturated radical with 8 to 24 carbon atoms and n = 2 to 4.

Description

BACKGROUND OF THE INVENTION The present invention relates to a copper phthalocyanine pigment preparation with beta modification and excipients, and to a process for the preparation of the preparation.

For printing purposes, i.e. especially for offset and gravure printing, colors pigmented with preparations based on copper phthalocyanine beta modification (C.I. Pigment Blue 15: 3) are used. There are very strict requirements for the products intended for intaglio inks. Only highly dispersed pigment may be used for pigmentation of paints, which must not contain larger and hard aggregates, so as not to damage the mold roll when wiping off excess paint.

The product must not excessively increase the viscosity of the ink, since it must fill the printing cells easily and perfectly. The amount of color that is transferred from the tiny cells to the substrate (paper) is very small, but the differences in this amount must still reflect the full scale of tones. The pigment must therefore be abundant so that the ink can also be used for modern high-speed printing machines. The pigment must be resistant to solvents, i.e. especially aromas. Only this last condition is met for copper phthalocyanine, as it is determined by the chemical structure of the pigment. Other requirements can only be met by micronizing the copper phthalocyanine to the required degree and then by using auxiliaries modifying the surface properties of the pigment particles so as to avoid particle re-aggregation and the product having an oleophilic character.

Micronization of copper phthalocyanine beta modification can be carried out by milling in aqueous suspensions (US Pat. 2 816 115, 2 999 862), in organic liquids (US Pat. 2 556 726), using bead mills optionally in the presence of surfactants (US Pat. .

775,149), or in a variety of kneading devices (US Pat. 2,982,666), by malexing with salts and glycols (U.S. Pat. No. 232,848), etc.

Micronization increases the color strength of copper phthalocyanine, but on the other hand, reducing the particle size of the pigment leads to an undesirable increase in ink viscosity. Moreover, as the average particle size decreases, their free surface energy increases, resulting in the formation of secondary particles - aggregates that must not be in intaglio ink. Existing methods for treating phthalocyanine pigment, such as those disclosed in Brit. U.S. Pat. 900 757,

978,242, 1,100,103, US Pat. 2,305,379, 3,775,149, etc. only partially eliminate these difficulties: either a satisfactory ink viscosity is achieved and aggregate formation is not prevented, or vice versa.

The pigment preparation according to the invention meets the requirements for pigment preparations intended for printing purposes, in particular for gravure printing. This preparation contains 67.5 to 95.9% by weight of the composition. % copper phthalocyanine beta modification, 4.0 to 30 wt. compounds or mixtures of compounds of the general formula

RCONH (CH ₂ ) _n OH (I)

0.05 to 1.0 wt. compounds or mixtures of compounds of the general formula

% RCOO (CH ₂ ) _n NH ₂ , (II) and 0.05 to 1.5 wt. acids of formula (III)

RCOOH (III) wherein in formulas (I) and (II) and (III), R is aliphatic saturated and / or unsaturated having a carbon number of 8 to 24 and n is 2 to 4. The pigment preparation of the present invention is produced by grinding copper phthalocyanine beta modification in aqueous suspension at 20 to 80 ° C and to the ground copper phthalocyanine dispersion, compounds (or a mixture thereof) of the general formulas (I), (II) and (III) are added at pH 1-8, at 20-100 ° C, after which the product is separated, washed and dried after recovery.

Copper phthalocyanine beta modification produced by a solvent or solvent-free process is used to produce the pigment preparation of the invention. The copper phthalocyanine is converted to the pigment form by milling in an aqueous suspension, e.g. in bead mills, at a temperature of 20 to 80 ° C, optionally in the presence of anionic and / or nonionic surfactants. Purified copper phthalocyanine having a copper phthalocyanate content greater than 96% by weight may be used as a raw material for grinding and further treating pigment particles. An advantage of the process according to the invention is that copper phthalocyanine, crude from continuous solvent-free technology containing less than 90% phthalocyanine, can also be used for processing into said pigment preparation.

The aqueous dispersion of copper phthalocyanine is adjusted to a pH of 1 to 8, preferably 2 to 6, wherein the acidification is carried out, for example, with hydrochloric acid, sulfuric acid, acetic acid and the like. ), (IX) and (III) either as such or as solutions, for example, in ethanol, acetic acid, etc., optionally in the form of an aqueous emulsion. It is preferred to add the appropriate compounds to the copper phthalocyanine dispersion only after the mixture has been heated to 40-100 ° C. The mixture is then stirred for, for example, 0.5 to 10 hours, after which the product is separated, for example, by filtration, washed with water and dried in an oven, for example, vortex, spray, belt or hazel.

Example 1

A suspension containing 0.8 kg of crude copper phthalocyanine of 78% by weight. phthalocyanine,

1.05 L of water and 0.05 kg of sodium sulfosuccinate were pre-milled on a corundum rotor flow mill. The pre-milled slurry was diluted with 1.2 L of water and then milled in a 0.6 L continuous horizontal mill filled with 0.48 L of 0.75 mm diameter glass beads, the peripheral speed of the discs was 15 ms. The mill was flushed with 2 L of water, which have been added to the ground dispersion. The dispersion was heated to 70 ° C and then an emulsion of 1.3 L of water, 1.6 g of palmitic acid, stearic acid and oleic acid (in a ratio of about 1: 1: 1.3) was allowed to stir with stirring for 30 minutes. 1.4 g of aminoethyl esters and 71 g of ethanolamides of these acids and 8 g of sodium di (2-ethylhexyl) sulfosuccinate. The mixture was then acidified with 30 ml conc. hydrochloric acid and stirred at 80 ° C for 60 minutes. After filtration, the product was washed with water to remove the reaction to chloride ions and dried at 90 ° C.

The product produced should be evaluated in gravure color. The paint had good flow properties and test proofs were of good quality.

Example 2

The pigment preparation prepared as in Example 1, but using a mixture of propanolamides, aminopropyl esters and free palmitic, stearic, oleic, linoleic and linolenic acids, has similar properties to that of Example 1.

Claims (2)

SUBJECT OF THE INVENTION A copper phthalocyanine beta modification pigment composition comprising 67.5 to 95.9% by weight of a copper phthalocyanine beta modification, 4.0 to 30.0% of a compound or mixture of compounds of formula RCONH (CH ₂ ) _n OH (I) 0.05 to 1.0 4 compounds or mixtures of compounds of formula RCOO (CH ₂ ) _n NH ₂ (II) and 0.05 to 1.5% of an acid of formula RCOOH (III) wherein in formulas (I), (II) and (III), R is an aliphatic saturated or unsaturated radical having a carbon number of 8 to 24 and n = 2 to 4. 2. A process for the preparation of the pigment preparation according to item 1 by grinding copper phthalocyanine in aqueous suspension at a temperature of 20 to 80 [deg.] C. and treating the obtained dispersion with excipients, characterized in that compounds of formula (I), (II) and (III) at 20 to 100 C and ^U at pH 1-8 and, after the mixture is mixed off product is separated, washed and dried. Severography, n. P., MOST Price 2,40 Kčs