CS261798B1 - Intaglio printing pigment - Google Patents

Abstract

Pigment preparation based on copper beta phthalocyanine Modification containing „„ 68 to 89.5% by weight of copper beta phthalocyanine ΛΗ2υΗ2^ modification, 0.5 to 7.0% by weight of the compound FCM-(CH,-N^ R) I of the general formula I where FCM is a copper phthalocyanine residue, R is CH,, O or NH and n is 1.5 to 2.5 and 10 to 25% by weight of the compound of the general formula II where R is a saturated or unsaturated, linear or branched aliphatic residue with a number of carbon atoms of 12 to 20 and m is 2 to 4.

Description

(54) Pigment preparation for gravure printing

Pigment preparation based on copper beta phthalocyanine Modification containing „„ to 89.5·% by weight of copper beta phthalocyanine Λ ^Η 2 ^υΗ 2^ modification, 0.5 to 7.0% by weight of the compound FCM-(CH,-N^ R) I of the general formula I where ^FCM is the residue of copper phthalocyanine, R is CH,, O or NH and n is 1.5 to

2.5 and 10 to 25 wt. % of a compound of general formula II where R is a saturated or unsaturated, linear or branched aliphatic radical with 12 to 20 carbon atoms and m is 2 to 4.

R-COHN(CH-)OH, ^1:1

2. m

The invention relates to a pigment preparation for gravure printing made using a beta modification of copper phthaloxycyanine, an aliphatic acid alkylolamide and a substituted copper phthalocyanine.

In the production of intaglio printing inks, pigment preparations based on beta-modified copper phthalocyanine (C. I. Pigment Blue 15:3) are used. These preparations contain various auxiliaries intended to prevent the formation of secondary particles that impair the dispersibility of the pigment in the application medium. A number of auxiliaries used for these purposes are described, for example, in British Pat. 900 757, 978 242, 1 100 103, US Pat. 2 305 379, 3 755 149, Jap. Pat. 45-20 991, 46-32 343, 48-1821. A disadvantage of intaglio printing pigment preparations produced by existing processes is that the dispersions of these preparations in the application medium have a high apparent viscosity. Poor flow properties of dispersions cause difficulties both in the production of gravure inks and in the printing process itself.

Research has now found that the above shortcomings can be eliminated by using a pigment preparation containing 68 to 89.5% by weight of beta-modified copper phthalocyanine, 0.5 to 7.5% by weight of a compound of the general formula

CH.CH,

FCM-(CH,N^ (I)

CH ₂ CH ₂ ^/ where FCM is a copper phthalocyanine residue, R is CH ₂ , O or NH and n is 1.5 to 2.8 and 10 to 25 wt. % of the compound of the general formula

R-CONH (CH ₂ ) _m OH (II) where R is a saturated or unsaturated, linear or branched aliphatic radical with a number of carbon atoms of 12 to 20 and m is 2 to 4.

The pigment preparation according to the invention contains 68 to 89.5 wt. % of beta-modified copper phthalocyanine, preferably with a mean primary particle size of 0.01 to 0.1 µm. The desired particle size can be achieved by micronizing raw or purified copper phthalocyanine, e.g. by grinding in bead mills or kneading in a malaxer. It is suitable to carry out the micronization of copper phthalocyanine in the presence of a compound of general formula I, i.e. substituted copper phthalocyanine, which binds to the surface of the copper phthalocyanine particles during the micronization process.

Compounds of general formula I can be prepared by chloromethylation of copper phthalocyanine and subsequent condensation of the chloromethyl derivative of copper phthalocyanine with piperidine, morpholine or piperazine.

In the micronization of copper phthalocyanine, the compound of general formula I is applied in such an amount that the resulting product contains 0.5 to 7.0 wt. % of this compound.

After micronization of copper phthalocyanine to a primary particle size of 0.01 to 0.1 μm, the surface of the pigment particles is treated with a compound of general formula II, ethanolamide, propanolamide or butanolamide of myristic, pentadecanoic, palmitic, heptadecanoic, becenoic, tricosanic, oleic, linoleic, stearic, nonadecanoic, arachidic, heneicosanic acids, etc. These compounds are applied in the form of a solution in a polar solvent miscible with water, such as ethanol, acetone, etc. or as an aqueous emulsion prepared using a suitable emulsifier.

Compounds of general formula II, like compounds I, bind to the surface of pigment particles. Both of these substances prevent the formation of secondary particles, i.e. difficult-to-disperse aggregates, and at the same time significantly increase the affinity of the particles for the solvent molecules used in the production of intaglio printing inks. The solvent molecules associate on the surface of the particles, resulting in advantageous rheological properties, i.e. low apparent viscosity of the dispersion of the preparation in the application environment.

The examples show the possibilities of preparing the pigment preparation according to the invention and present the properties found.

Example 1

A suspension containing 1.2 kg of copper phthalocyanine (97%), 1.8 l of water, 0.07 kg of sodium di(2-ethylhexyl)sulfosuccinate, and 0.025 kg of the compound ch ₂ ch ₂ fcm-(ch ₂ n^ \ _C h ₂ ) ₁₍₉ ^C »2 ^CH 2 ^X was ground in a KDL Special 0.6 W'. A. Bachofen bead mill filled with 0.48 l of glass beads with a diameter of 0.75 mm. The grinding was carried out at a peripheral speed of 15 ms and a suspension flow rate of 5 l/h. The suspension was ground in two passes through the mill, after which it was diluted with 8 l of water.

A solution of 0.15 kg of stearic acid ethanolamide in 2 l of ethanol was added to the obtained dispersion with stirring. The mixture was heated to 70 °C, adjusted to pH 4 with hydrochloric acid and stirred for 60 minutes. The mixture was then filtered while hot and the filter cake was washed with water until the Cl reaction in the filtrate disappeared. The product was dried at 90 °C and ground in an Alpíne LU-100 mill at a power input of 35%.

A gravure printing ink was produced using the preparation. The test prints with this ink were of good quality, the determined yield, shade and dispersion hardness were the same as for the comparative print produced using ink pigmented with previous preparations. The apparent viscosity of the preparation in toluene (concentration 30% by weight) at a shear rate of 10 s ^- ^ and at 25 °C was 0.8 Pas, the comparative dispersion had an apparent viscosity of 6.3 Pas. The pigment preparation according to the present invention therefore has better rheological properties.

Example 2

Using the procedure as in Example 1, a pigment preparation was produced containing 80.0% by weight of beta-modified copper phthalocyanine with an average primary particle size of 0.045 μm, 3.0% by weight of the compound

FCM-( _CH2N ^/ ^O >2.6'

CH ₂ CH^ % by weight of oleic acid ethanolamide and 8% of palmitic acid ethanolamide. The preparation had good coloristic properties, the apparent viscosity of the pigment dispersion in toluene was 1.2 Pas, i.e. only 20% of the comparative value.

Example 3

Similar properties to those in Examples 1 and 2 were possessed by pigment preparations containing

FCM-(CH ₂ n or

CH _O CH _O ²

FCM~(CH _O N - O)o/:

From above

CH ₂ CH ₂ ·^ or

FCM-( _CH2N

CH.CH, ^CH 2 ^CH 2 ^/

NH)

2,5’ and ethanolamide, propanolamide or butanolamide of arachidic, behenic, oleic or linoleic acids.

Claims (2)

SUBJECT yYN&LEZU Pigment preparation for intaglio printing based on beta-modified copper phthalocyanine, characterized in that it contains 68 to 89.5 wt. % of beta-modified copper phthalocyanine, 0.5 to 7.0 wt. % of a compound of the general formula FCM-tCH.N^ \r)„ ² \ / ^{n X} CH ₂ CH ₂ ^ where FCM is the residue of the general formula of copper phthalocyanine, R is CH ₂ 0 or NH and n is 1.5 to 2.5 parts by weight of the compound R-CONH(CH-)OH, 2 m where R is a saturated or unsaturated, linear or branched aliphatic radical having 12 to 20 carbon atoms and m is 2 to 4.