DE2165427A1 - Process for the production of black printing ink - Google Patents

Description

DR. BERG DIPL.-ING. STAPF

PATENT LAWYERS
8 MUNICH 8O. MAUERKIRCHERSTR. 45

Dr. Berg Dipl.-Ing. Stapf, 8 Munich 80, Mauerkircherstraße 45

Your reference your letter Our reference date

Dec 29, 1971

Attorney file 21 917
Be / Ro

AKZO N.V.

Arnhem, the Netherlands

"Process for the production of black printing ink"

This invention relates to a process for preparing a black ink having improved properties, the lamp black (in Jflngl. Ü'urnace carboxylic .Black) (J) ¹ Ou) as pigment. The invention relates in particular to a method for controlling the viscosity of such printing inks.

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gla / nVi BERGSTXPF

98 82 72/48 70 43 (98 70 43) 48 33 10 (Λ3Τ107 ^w Tlfegranimti BÜRGSTAPFPATENT Munich TELEX 05 24 5 «BERG d Bank ι Bayerisch · Vtrcinibank MOnchtn 453100 Poitichecki Munich 653 43

It is known (furnace) soot or lamp soot (soot black) to be used as a black pigment in printing inks. A black printing ink should take into account various conditions correspond to their blackness, gloss, flow, viscosity and the flow value (expansiveness), i.e. a color must also have good rheological properties in addition to good color properties. Numerous types of carbon black are already there known, which are also used as black pigments in the printing ink industry. Depending on the specific Every type has properties of carbon black, such as surface, pore volume and the content of volatile substances carbon black has a special field of application in which it is most satisfactory with regard to its color pigment properties is working. The requirements for high-quality pigments for printing inks for offset and letterpress printing are different compared to pigments for printing inks for newspaper rotary printing. The flame black (FCB) used as color pigments are used, generally have a surface between

2
see 25 and 15o m / g, a particle size of 15 to 50 mu and an oil absorption between 0.5 and 1.5 cm / g.

In the case of printing inks with a high carbon black content (up to 2o to 25 wt / S), which are used in particular as printing inks for the Offset and letterpress printing are used and where color blackness, gloss and flow are of great importance the soot should preferably have a large surface area

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(75 to 150 m / g), a low ul absorption value (0.5 up to 0.8 cm / g) and a large number of surface groups (high, volatile material content). In the event of of printing inks with a low carbon black content (8 to 12 weight fo), where such printing inks are used, inter alia, for the rotary printing of newspapers, the viscosity is the printing ink is of particular importance »

It is generally known that the pigment properties of carbon black by suitable selection of the reaction conditions in a given process can be changed in terms of quality can. Processes have already been proposed by which certain printing ink pigment properties are post-treated can be improved by soot.,

In contrast, it has been found that in this way it is generally possible to obtain only one or a few ink pigment properties significant change. It is often the case that carbon blacks are used, some of which are used the most essential color pigment properties for a given Purpose are satisfactory while other significant properties are lacking. For example, are flame blacks (FGB) known that, for example, printing inks for newspaper rotary printing have sufficient injectability and ink coverage and provide gloss, but in view of the low pigment concentration of about 10% by weight,

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commonly found in these inks have deficiencies in their ability to use these inks to give sufficiently high viscosity.,

It has now been found that the viscosity of printing inks based on flame soot (FCB), which have good coloring properties, but too low viscosity for certain purposes, for example newspaper rotary printing in the case of lower Rigment concentrations have a desired high viscosity value can be awarded if part of the flame black (FCB) in the printing ink system is replaced by gas black (im Engl. "Gasification Garbon") (GC), replaces that as a by-product in the known process for the production of a gas mixture containing carbon monoxide and hydrogen, obtained by pyrogenic decomposition of hydrocarbons by means of oxygen-containing gases at high temperatures will ο

The lower limit for replacing the amount of flame black (FCB) with gas black (GC) is approximately 0.5% by weight. Above this percentage occurs a marked increase in the viscosity one "It is generally not necessary ew about 20 to replace> because more than 20 percent. Fo the viscosity has such a high level that it is undesirable for practical use. In general, it is preferable to replace 2-12% by weight of flame black (FCB) with gas black (GC).

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Carbon black (G-O) is a by-product of non-catalytic processes Gasification processes, such as the Shell gasification process and the Texaco gasification process.

These processes are for example in hydrocarbon processing, Volume 46, Number 11 (The 1967 Petrochemical Handbook Issue), November 1967, page 227 (Shell gasification process) and in "Industrial and Engineering Chemistry", vol 48, number 7, pages 1118 to 1122 (Texaco gasification process) described. Also in British Patents 649 645, 734 475, 755 946, 780 120, 834 940, 834 989 and 995 764 and in the ÜS patent documents 2 582 938, 2 665 980 and 2 914 418. A comparative study of some known gasification processes can be found in "Advances in Petroleum Chemistry and Refining ", Volume 10, Chapter 4, pages 123-189 (Interscience Publishers, New York, 1965).

The carbon produced by this well-known process is commonly known as carbon black (GC) and its surface, determined by the BET method is 300 to 1500 m / g, and it has a micropore volume (Np method) of 1.0 to 3.0 cm / g, a macropore volume (Hg porosimeter) of 2.0 up to 4.0 cm / g, an oil absorption of 2.5 to 5 »5 cm / g, a volatile matter content of 0.1 to 6.0% by weight, and an ash content of 0.5 to 10.0% by weight

By introducing carbon black in the quanti-

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did in the printing ink can affect the viscosity of the printing system increased by a factor of 2-3.

Since the viscosity can also be increased beyond the practically desired value, it can be concluded that in some cases it is sufficient to use a lower pigment concentration than usual in the printing ink, and this can be economically advantageous in those cases where binders are relatively cheaper than pigments.

The gas black (GC) can of course be premixed with the flame black (FCB), and then the mixture can be used in the paint binder be dispersed. The carbon black (GC) can also be added to an aqueous suspension of the carbon black (FCB) and this suspension can then be spray-dried to give the spray-dried, intimate mixture of To disperse flame black (FCB) and gas black (GC) in the color binder.

The following examples illustrate the invention.

example 1

A printing ink was made from the following components:

Io parts by weight of flame black (FCB) with a BET-N ₂ ~ upper

2
area of loo m / g and an oil absorption (dibutylphtha-

lat) of 1.05 cm / g were in a three-roller printing ink 209831/1074

Beninese in 90 weight percent printing ink binder (708 g / M, manufactured by Chemische Fabriek Gembo N.V.) mixed.

More 4 ink mixtures were prepared in the same manner in which fo 1 wt., 2 wt. "/>, 4 wt. $ And 8 wt. ° ß> of lamp black (FCB) by a corresponding percentage of carbon black (GC) with a BET-Ng surface area of 1200 m ² / g and an oil absorption (DBP) of 3 »80 cnr / g was added.

The viscosity of the dispersion after grinding four times and the blackness on paper were measured for the following 5 color mixtures. The results are given in Table A. The details of a known, commercially available product are given for comparison purposes (Printex U, produced by Degussa with a ΒΕΤ-Ν, -, - Oberfiäche of 108 m / g and an oil absorption of 1.28 cnr / g _o The table header ( O), (1), (2), (4) and (8) indicate the percentage of lampblack (FCB) that is replaced by carbon black (GC) ο

Tabel A. (2) U) (8th) Printex U (0) (D 201
7th 222
7th 266
7th 264
6th 180
5 192
7th

Dispersion / U (b)

Blackness (c) 1.11 1.11 1.11 1.12 1.10 1.05

(a) Determined with "Brockfield Synchrolectric viscosimeter" at 20 rpm after 2 minutes «

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(b) Determined after the last run on a three-roller mixer using the NPIRI grindometer or ^f5 ink fineness meter "(Hegman type) according to the IiPIRI standard investigation method 1949/1955 - Dl.

(c) Determined with the "Baldwin Densitometer", the printing ink blackness being measured by means of a test layer which is measured with the IG-T device (type Ap) with a layer thickness of 9.6 / U ₀

The details in the table show that the unsuitable, low viscosity of a flame black (POB) with excellent blackening can be increased to a practically acceptable level if some of the carbon black is passed through Carbon black (G-G) replaced, the excellent blackening properties of printing inks as well as the dispersion properties of the pigment being retained.

Example 2

A lamp black (FGB) with a BET-Hg surface area of 106 m ² / g and an oil absorption (dibutyl phthalate) of 1.2 cm / g was treated with a gas black (GC) amount (BET! ^ - surface area 1200 m ² / g DBP absorption 3.8 cm ^ / g) mixed so that the mixture contained 2% by weight of carbon black (GG). This pigment mixture was dispersed in water to form a suspension which contained 10% by weight of pigment. The suspension was passed through a colloid mill (35 / u setting) and then several times

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spray dried in a spray dryer (, nozzles ITR. 55/21, manufactured by "Spraying Systems Go." Illo, U.SoAo) was equipped with a pressure atomizer, wherein a pressure of 105 atm, a drying gas inlet temperature of 45O ⁰ G, a Exit temperature of 135 ⁰ G and a drying gas suspension weight ratio of 9 was used "

Another 5 commercial pigments were made in the same way produced, but 3 ffewo / », 4 wt. $, 6 wt. $, 8 wt. $ and 12% by weight of flame black (FOB) have been replaced by gas black (GC) »

The spray-dried products were incorporated into inks for newspaper rotary printing according to the following formulation :

12 parts by weight of pigment, 44 parts by weight of lacquer (M 708, manufactured by Chemische Fabriek Gembo Itf.V) and 44 parts by weight share "Fusus" oil A (Shell).

Processing: 13 minutes in a "cowless dissolver" 3000 rpm and then three times through a colloid mill »

The properties determined for these printing inks are given in Table B, which also contains details for flame black (FCB) (O) and for a commercially available product (Printex V, manufactured by Degussa, BET-Ng-Oberflache, 110 m / g DBP -Absorption 1.28 cm / g) stated β ind ο

-10-

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Table B.

(O) (2) (3) (4) (6) (ö) (12) Printex

Viscosity ρ (a) - at 10 rpm 94

at 20 rpm 52

Dispersion / U (b) according to 2'Sana Mill 13

112 126 134 146 176 216
62 68 73 79 96 115

12th

9 9 after 4'Sand Mill <5 45 <5 <5 C3 <5 <5 Blackness (c) 0.95 0.96 0.96 0.97 0.97 0.97 0.97 0.91

9
<5

10

140 76

(a) Determined with "Brookfield Synchrolectric Viscometer" after 2 minutes at 10 or 20 rpm.

(b) Determined after 2 and 4 minutes of grinding in the "Sand Mill" with the NP IR I grinder or printing ink unit knife (Type Hegman) according to the NPIRI standard test procedure 1949/1955 - Dl.

(c) Determined using the "Baldwin Densitizer" with which the printing ink blackness was measured on a test film which was _{applied to paper with an IG-T device (type A 2} ) with a layer thickness of 4.8 / u ο

The details given in the table show that the viscosity of a flame black (FCB) based printing ink with excellent blackening properties can be brought to a desired viscosity if one Part of the pigment replaced by carbon black (G-C).

Claims ι

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Claims (4)

- 11 patent claims: 1. Process for controlling the viscosity of black printing ink, the furnace carbon black as a pigment contains, characterized. that in addition to the flame black (FCB) in the printing ink Gas soot (G-asification Carbon) introduces, which is a by-product of the known processes for the production of a gas mixture containing carbon monoxide and hydrogen, by pyrogenic decomposition of hydrocarbons by means of oxygen-containing ones Gas is obtained at high temperatures, the amount of carbon black in the range between 0.25 wt. ^, Based on the total weight of the pigment. 2. The method according to claim 1 characterized in that the amount of carbon black (GC) is between 2 and 12 wt.%, Based on the total weight of the pigment _s. 3. The method according to claim 1 or 2, characterized that the total black pigment content in the printing ink is between 8 and 12% by weight. 4. Printing ink, provided it is produced by the method according to one of the preceding claims. 209831/1074