Process for the preparation of offset printing inks

The invention relates to a single step process for the preparation of Offset printing inks or their flowable concentrates for a Step process.

Inks are usually produced by solids, as color pigments and additives, by means of dissolvers and Stirred media / three-roll mill aggregates in binders and liquids such as oils, are dispersed, wherein the Binder solutions previously by boiling resins and various Aggregates are obtained in oils. This Druckfarbenherstellprozeß is technically very complex, lengthy and energy intensive.

According to the known prior art is as a feedstock for the manufacture of printing inks at least one, but usually several Binders certain rheology required. To prepare the Binder is a resin, but often a plurality of different resins, in an oil mixture for several hours at temperatures around 180 ° C under Stirring heated. The energy input is usually a Thermal oil, which in a separate gas-or oil-fired plant is heated, and the process is rendered inert. After cooling, is temporarily stored until the Weitervararbeitung. to adequately to be able to deliver, keep the ink manufacturer necessary for the specific delivery assortment binder in front. Storage is usually in storage tanks for Maintaining the pumpability of the binders are heated. Alternatively, in containers, eg 200 l drums, stored whose Content prior to use in a heat chamber to improve flowability is heated. Upon storage, depending on time, temperature and composition of the gas overlay Changes related. The set during production Rheology result.

Further processing for printing ink is then as described above.

There has been many attempts to shorten this production process and to simplify. For example, in the EP 0022746-A1 describes a method in which pigments and certain thermoplastic resins in the melt, or with the addition of mixed by again to remove solvents together are to pigmented resins as a raw material for printing inks receive; the process of color production from these pigmented Resins itself is not described. In the EP 0290108-B1, the pigmentation of thermoplastic binders above in an extruder at temperatures the melting point of the binder resin and adding a liquid Diluent shortly before or after leaving the extruder, described for the preparation of a printing ink base stocks.

CH 678 333 A5 discloses a process for the production of printing inks, wherein the binder and other components of the metered ink such as pigments in an extruder are mixed therein and intensively with one another. For the However, procedures are finished binder as raw materials used, the above-described production of Binders of binder resins, oils and additives must still take place in a separate, preliminary step.

The object of the present invention is to provide a method was, which allows the preparation of offset printing inks, without any adverse effect on their quality to further simplify, and in certain cases even improved quality to achieve.

Surprisingly, this task can be carried to the invention solve one-step process.

The present invention is a one step process for the production of offset printing inks or their concentrates that is characterized in that for the individual components the Bindeimttel and other solid and liquid components of Ink pooled together in a mixer and is directly are processed for offset printing ink or to concentrate.

In the one-step process according to the invention, the product obtained at the processing temperatures of at least 70 ° C, the majority of the necessary energy for heating in Form is introduced mechanical energy.

The viscosity of the inventively obtained offset printing ink and the concentrate is generally between 10 and 300 Pas.

In the invention procedure is to separate production the binder completely eliminated. The Gesamtherstellprozess is seen so time is much shorter and the Reproducibility of the process due to the elimination of some Process steps and intermediate storage greatly improved.

The pigments can be used as dry pigments or pigment precursors are registered or in the form of a paste into the mixer.

The single step process according to the invention for the preparation of Offset printing inks can be much easier and more economical perform than the processes of the known art. Moreover, drawing the produced according to the invention Inks by improved quality, for example, be in a reduction of Bronciereffektes (color change depending on incident light) shows.

For the inventive process is to be executed, the following details.

Among offset printing inks according to the invention are used for the usual offset printing process such as sheet-offset, i Roller offset, fast-offset, continuous and sheet printing usual understood, the composition and combination of the raw materials are widely variable. This also applies to the Inks underlying solid and liquid components. The individual solid components can in powder or be introduced granular form or as a paste.

Suitable pigments are usually suitable for offset printing suitable, for example, pigment black, phthalocyanine (CI 15) Rubin Toner (CI 57: 1), diaryl (CI 12 / CI 13) and the in Spot color range conventional pigments. Further, fillers, such as calcium carbonate and inorganic pigments are used.

As hard resins, for example, used in particle sizes <1 cm can, for example, are rosins, hydrocarbon resins, modified rosins, example such which are modified with acrylic acid or maleic acid, modified Hydrocarbon resins, for example those with the Rosin or phenol resin are modified, acrylic resins, coumarone resins, Indene resins, cyclic rubber and mixtures of such resins,

The additives are the customary thixotropic and thickening agents to call, such as bentonite and / or silica, gelling agents, for example aluminum (= polymeric organic aluminum complex, dissolved in Dibutylphthahalat and mineral oil), wetting agents, such as soya lecithin, fatty acid ester or Polyhydroxysterinsäure; Desiccants, such as cobalt and manganese compounds and lubricants such as customary for offset inks waxes.

As liquid components of the ink may be mentioned vegetable Oils and derived polyesters (alkyds), ​​for example on Based on linseed oil, soybean oil, sunflower oil, corn oil, grapeseed oil, Safflower oil, tall oil, cottonseed oil, castor oil, tung oil, oiticica oil, Perilla oil, and mineral oils, and organic solvents such as for example, aliphatic and / or aromatic hydrocarbons with a boiling range between 150 and 400 ° C, for example, printing inks oil (= Mainly paraffinic hydrocarbon mixture of 67% Paraffins, 25% naphthenes and 8% aromatics with a boiling range 260-290 ° C eg Mihagan 26/29 B), as well as plasticizers, for example esters of adipic acid and citric acid, as Dinonyl, isotridecyl and optionally antioxidants (Eg 2,6-di-tert.butylkresol).

The liquid and solid components are in the for Ink usual proportions in a mixer combined and reports directly to the offset printing ink or to Concentrate processed. The mixers are continuously or batch-type mixer, for example, with a power of about 60 KW / m³ operate. Suitable mixers include Doppelwellendissolver, Laboratory Blender (the Messrs. Waring Commercial) etc.

It is important that sufficient mechanical energy added becomes. The process can by additional introduction of heat get supported. In certain cases it can, however, also necessary be that incurred during insertion of the mechanical energy dissipate heat by suitable cooling.

A continuous mixer can therefore expediently be sectionally heated and cooled, while not continuous mixer both heating and can have cooling.

The process may be carried out under air. In particular Cases it may also be advantageous, under an inert atmosphere to work so as to avoid air pockets. Next, it may be in some cases beneficial, contained to remove gas bubbles by applying a vacuum. But it is also possible for the product by subsequent passage over to vent a three-roll mill.

The hard resins, coloring pigments and solid excipients entered in powder form or as granules. The energy is required for the comminution of the granules, must of course are additionally introduced.

For certain reasons, which are not due to the process, there is often a desire to certain components, such as coloring Pigments or surcharges to bring in the form of pastes. This procedure is also possible without disadvantage.

In particular, very temperature sensitive Recipe ingredients it may be advantageous, as these ingredients in a paste-like Form only after cooling the batch critical under the interfere temperature.

The inventive method allows an astonishing variability. Thus, for example in the production of offset inks the Desiccant added and miteingemischt already in the first step will. According to circumstances, the user can also the desiccant are mixed into the finished product. It's the same with other recipe ingredients. It is therefore also possible to use a produce printing ink concentrate and to dilute this later, an approach that provide certain logistical advantages can.

The parts mentioned in the examples and comparative examples and percentages are, unless otherwise indicated, parts by weight and percent by weight.

example 1

In a laboratory mixer (manufacturer: Waring) are to 52 parts of Mixture of:<tables><table><tgroup cols="2"><tbody><row><entry align="left">29.9 parts</entry><entry align="left">Printing ink oil (boiling range 260 ° to 290 ° C)</entry></row><row><entry align="left">11,77Teilen</entry><entry align="left">linseed oil</entry></row><row><entry align="left">4.9 parts</entry><entry align="left">castor oil and</entry></row><row><entry align="left">3.6 parts</entry><entry align="left">a mixture of</entry></row><row><entry align="left" /><entry align="left">- 20% Ditertiärbutylkresol</entry></row><row><entry align="left" /><entry align="left">- 10% dinonyl</entry></row><row><entry align="left" /><entry align="left">and 70% Printing ink oil (boiling range 260 ° C to 290 ° C)</entry></row><row><entry align="left">0.3 parts</entry><entry align="left">isotridecylalcohol </entry></row><row><entry align="left">1.5 parts</entry><entry align="left">long oil linseed oil and</entry></row><row><entry align="left">0.03 parts</entry><entry align="left">aluminum chelate</entry></row></tbody></tgroup></table></tables>48.0 parts of a in a laboratory mill (manufacturer: Ika) pre-shredded Mixture of:<tables><table><tgroup cols="2"><tbody><row><entry align="right">30.8 parts</entry><entry align="left">rosin phenolic resin</entry></row><row><entry align="right">and 16.7 parts</entry><entry align="left">Pigment Red 57 and</entry></row><row><entry align="right">0.5 parts</entry><entry align="left">PTFE wax</entry></row></tbody></tgroup></table></tables>and stirred for 5 minutes. The temperature of the batch increases in the mixing process at 123 ° C.

By stirring of 2% and 4% isotridecylalcohol inks oil the desired rheology is adjusted. Subsequently, a passage on a three-roll mill.

Comparative example

A mixture of<tables><table><tgroup cols="2"><tbody><row><entry align="left">16.7 parts</entry><entry align="left">Pigment Red 57,</entry></row><row><entry align="left">0.5 parts</entry><entry align="left">PTFE wax and</entry></row><row><entry align="left">2.9 parts</entry><entry align="left">a mixture of</entry></row><row><entry align="left" /><entry align="left">- 20% Ditertiärbutylkresol</entry></row><row><entry align="left" /><entry align="left">- 10% dinonyl</entry></row><row><entry align="left" /><entry align="left">and 70% Printing ink oil (boiling range 260 ° C to 290 ° C)</entry></row><row><entry align="left">3.5 parts</entry><entry align="left">linseed oil</entry></row><row><entry align="left">2.0 parts</entry><entry align="left">Printing ink oil (boiling range 260 ° C to 290 ° C)</entry></row><row><entry align="left">4.9 parts</entry><entry align="left">castor oil</entry></row><row><entry align="left">62.2 parts</entry><entry align="left">A binder</entry></row><row><entry align="left">7.3 parts</entry><entry align="left">binder B</entry></row></tbody></tgroup></table></tables>is pre-dispersed using a dissolver. After further Dispersion in an agitator ball mill is carried out by stirring of isotridecyl and ink oil (eg Mihagan 26/29 B) an adjustment of the rheology to the values ​​of the example 1. Finally, again takes place through a triple-roll mill.

Binder A was prepared by heating for two hours with stirring to 180 ° C a mixture of<tables><table><tgroup cols="2"><tbody><row><entry align="left">38.2 parts</entry><entry align="left">Kolophoniummodifiziertem phenolic resin</entry></row><row><entry align="left">in 15.2 parts</entry><entry align="left">linseed oil </entry></row><row><entry align="left">13.6 parts</entry><entry align="left">Printing ink oil (boiling range 260 ° C to 290 ° C) and</entry></row><row><entry align="left">0.3 parts</entry><entry align="left">a mixture of</entry></row><row><entry align="left" /><entry align="left">- 20% Ditertiärbutylkresol</entry></row><row><entry align="left" /><entry align="left">- 10% dinonyl</entry></row><row><entry align="left" /><entry align="left">and 70% Printing ink oil (boiling range 260 ° C to 290 ° C) and</entry></row><row><entry align="left">20.0 parts</entry><entry align="left">long oil linseed.</entry></row></tbody></tgroup></table></tables>

After the addition of<tables><table><tgroup cols="2"><tbody><row><entry align="left">2.3 parts</entry><entry align="left">Printing ink oil (boiling range 260 ° C to 290 ° C) and</entry></row><row><entry align="left">0.4 parts</entry><entry align="left">aluminum chelate</entry></row></tbody></tgroup></table></tables>the temperature for another 30 min. maintained at 180 ° C. After adding<tables><table><tgroup cols="2"><tbody><row><entry align="left">10.0 parts</entry><entry align="left">linseed oil</entry></row></tbody></tgroup></table></tables>is filtered and cooled.

Binder B was prepared by heating for two hours at 190 ° C and stirring of a mixture of<tables><table><tgroup cols="2"><tbody><row><entry align="left">44.8 parts</entry><entry align="left">kolophoniummodifiziertem phenolic resin</entry></row><row><entry align="left">in</entry></row><row><entry align="left">10.7 parts</entry><entry align="left">linseed oil</entry></row><row><entry align="left">33.0 parts</entry><entry align="left">Printing ink oil (boiling range 260 ° C to 290 ° C)</entry></row><row><entry align="left">0.5 parts</entry><entry align="left">isotridecyl and</entry></row><row><entry align="left">1.0 parts</entry><entry align="left">a mixture of</entry></row><row><entry align="left" /><entry align="left">- 20% Ditertiärbutylkresol</entry></row><row><entry align="left" /><entry align="left">- 10% dinonyl and 70% Printing ink oil (boiling range 260 ° C to 290 ° C)</entry></row></tbody></tgroup></table></tables>

After the addition of<tables><table><tgroup cols="2"><tbody><row><entry align="left">10.0 parts</entry><entry align="left">Printing ink oil (boiling range 260 ° C bis290 ° C)</entry></row></tbody></tgroup></table></tables>was filtered and cooled.

example 2

Determination of Bronciereffekts(Instrument: Optronic Colour flash 45; D65 / 2 °)

The preparation method according to the invention surprisingly leads also to a reduction of the so-called Bronciereffektes (Color change depending on the incident light).

This disturbing effect as is in semi-opaque ruby ​​toners such as Litholrubin D 4560 DD (BASF) or Irgalithrubin LPBC (Ciba-Geigy) clearly recognizable. After coating with Dispersion varnish (or lamination) this optical disappears perfect impression.

Test colors of the same composition, the once conventional and be prepared to another according to the invention, were coated on printed paper in half and coated with emulsion paint. Since this property visible particularly on Black is a black ground was chosen. Thereafter, the Color difference of the respective print with and determined without polish.

The larger the color difference Δ E, the greater is the Bronciereffekt of unpainted pressure.

The 17% strength show with Litholrubin pigmented colors, provided they were prepared according to the inventive method, lower by 28% than corresponding conventional Bronciereffekt produced colors.