DE3715836C2 - - Google Patents

Description

Alkali blue toner are traded in four different forms: dry Alkaline Blue, Fluxed Alkali Blue (the pigment becomes dewatered by kneading with hydrophobic binder and converted into paste form), alkaline blue press cake and Alkali blue dispersed pulp. Of these four types of Alkaline blue toners become dry and flushed Alkali blue toner mainly for the production of Printing inks used. Be dry alkaline blue toner currently used only to a limited extent  in smaller quantities than whispered alkaline blue toner produced, because the coloring power of it only about 50 to 85% which is from whispered alkaline blue toners.

Dry alkaline blue is after the so-called grinding or Crushing methods are produced in which one has a Mixture of dried pigment and vehicle a three-roll mill finely ground and wherein the particles from the pigment due to the gravitational forces between the rollers be crushed.

On the other hand, liquefied alkaline blue is produced by a vehicle with undried pigment, which is always Still contains water, by means of a kneader, which as Flusher, mixed and thereby the pigment of the aqueous phase is converted into the vehicle phase. The Production can then be stopped by using the water Decanting removed.

The alkaline blue toner thus obtained becomes black Printing inks of the order of a few percent introduced to thereby deepen the blackness. The Toner is also used in ultramarine inks Order of a few percent introduced to the Make sound clearer.

However, alkaline blue is a pigment that is not easy Flushen can and therefore is the choice of Flushingvehikels and the surfactant of the utmost importance. Nevertheless, the prior art has high viscosity Flushing vehicle consisting of polymerized animal  or vegetable oils, such as fish oil, whale oil, linseed oil, and natural or synthetic oils used because it is primarily about the wettability of the alkali blue pigment and less about its printability. Consequently you need a strong dispersant for the production. In addition, those made as above Alkali blue toner of the prior art has the disadvantage that when incorporated into a black ink, they worsen the drying properties and one Metallic gloss, which is also called bronzing the surface denoted by the ink, resulting in the degree of Blackness is reduced. You can therefore only in apply to a very limited extent.

The object of the invention is to provide a To provide alkaline blue toner composition, which are well incorporated in a black ink leaves, has good drying properties and a high degree of blackness. This task is accomplished by a An alkaline blue toner composition according to claim 1 solved. The invention also relates to a method for Preparation of the alkaline blue toner composition according to to claim 2.  

The alkaline blue toner composition of the present invention can be obtained by adding a disperser with only low power because it is not necessary highly viscous vehicle, as in the case of Alkali blue toners of the prior art were needed, apply. The composition obtained shows not the "bronzing" phenomenon. By use a solvent, which has a wider range of choices gives as in Flushingvehikeln containing animal or vegetable oils, you can get that Alkali blue toner composition according to the invention numerous areas with increased flexibility for the goods to be used.

The main component in the hydrous Alkali blue pigment is a triphenylmethane dye or a mixture of them. Such Triphenylmethane compounds are commercially available, generally in paste form, usually containing 70 to 80% water.

Suitable triphenylmethane dyes are, for example:

Those used in the present invention Solvents are chosen among those which has a boiling point in the range of 150 to 400 ° C when distilled to 50% by volume. It can be either aliphatic or aromatic Be solvent or mixtures of one or be more of such solvents or from such solvents and natural and / or synthetic resins.

Those used in the present invention Surfactants may be anionic, cationic, non-ionic or amphoteric.

(I) Preparation of alkaline blue toners Preparation 1 (Toner A)

In a 1200 liter hydraulic reversing kneader were 350 kg a hydrous paste of an alkali blue pigment and 12 kg of the sodium salt of a dialkyl sulfosuccinate as a surface active Given funds. After 10 minutes of kneading gradually, 120 kg of an ink solvent (average molecular weight 236, aromatic Hydrocarbons 20% by weight, paraffinic hydrocarbons 47% by weight, naphthenic hydrocarbons 33% by weight)  admitted and the The resulting mixture was allowed to drain for about 30 minutes kneaded. In addition, 200 kg of alkaline blue added and the mixture was then 10 minutes kneaded. Subsequently, 50 kg of the previously mentioned Ink solvent and the resulting Mixture was another 10 minutes to obtain a kneaded further drainage. Then 20 kg of alkaline blue was added and the mixture was stirred for 10 minutes. Another 50 kg of the same solvent was added and the The resulting mixture was then allowed to stand for an additional 10 minutes Achieving a third drainage kneaded.

The resulting mixture was subjected to vacuum flushing a kneader at a pressure of 53.2 mbar (40 mm Hg) and a Temperature of 70 ° C over a period of 3 hours subjected to, wherein the water content in the mixture 0 to 2 wt.% Has been reduced. Another 188 kg of the same Printing ink solvent was added and the The resulting mixture was then kneaded until one received uniform product. The thus obtained Alkali blue toner was referred to as Toner A.

Preparation 2 and 3 (Toners B and C)

Toners B and C were used in the same way as in the Preparation 1, but with solvents, surfactant and the other ingredients were used in the amounts indicated in Table 1.  

Table 1

(Preparation of Toners A, B and C)

Preparation 4 (Toner D)

To a hydraulic reversing kneader with a volume of 1200 l was Alkaline blue (hydrous paste of alkali blue pigment), a Long oil alkyd resin vehicle and polyoxyethylene nonylphenyl ether in the following Quantities were added and the ingredients were effective of a phase transition kneaded. Excess water was then removed by decantation and after the Evaporation in vacuo gave a product with a Water content from 0 to 2%. This product is called Alkali blue vehicle toner D is designated.

Alkaline blue | 750 kg Long oil alkyd Verhikel 408 kg polyoxyethylenenonylphenyl 12 kg

(II) Pressure test (i) Test as a thermosetting printing ink (in the heat drying ink) (i-a) Preparation of the varnish A

In a dissolving tank, with a stoker was provided, 40 parts were one with a vegetable resin modified phenolic resin,  10 parts polymerized flaxseed oil, 5 parts alkyd resin, and 40 Parts of printing ink solvent (average molecular weight 200, Aromatics 17% by weight, paraffin 58% by weight, naphthenes 25% by weight). The Ingredients were added while stirring while about 30 minutes at a temperature of about 200 ° C solved. Then the solution was allowed to stand. If the temperature had dropped to 100 ° C a separately prepared mixture of 5 parts of ink solvent of the above composition and 1 part of aliphatic solvent added, giving a "paint A", having a viscosity of 25 Pa · s / 25 ° C (measured in a B-type viscometer (Brookfield viscometer)) would have.

(i-b) Production of Printing Inks A to D

Lacquer A and Alkaline Blue Toner A, B, C or D, prepared according to preparation 1, 2, 3 or 4, were in the quantities indicated below mixed and then put on a three-roll chair Addition of customization solvents up to a "tack" value of 9.0 (800 rpm, 30 ° C, 1 minute, measured according to JIS K 5701) ground, under Receipt of test ink A, B, C or D.

parts Carbon black (oil absorption 61 ml / 100 g volatile fraction 3.9%, pH 2.5) 18 Lacquer A 60 Toner A, B, C or D 10 wax compound 10 Printing ink solvent (average molecular weight 200, aromatics 17% by weight, paraffin 58% by weight, naphthenes 25% by weight) 2

(i-c) drying test

Test Ink A was measured by a tester on 90 kg of paper in a Amount of ink of 0.15 ml per 1/2 Cutting roll printed. The so printed Paper was held at 110 ° C Thermostats are inserted and the state of the Printing ink was spaced by finger 2 seconds checked. In the same way were examined the printing inks B, C and D. The The results obtained are shown below.

Test ink Drying time (sec) A 4 B 4 C 4 D 8th

It can be seen that the printing inks, at which alkaline blue toner according to the invention were used within a remarkable short time dried compared to Printing inks, which include alkaline blue toner, the obtained with the vehicle technique, used.

(ii) Test as "Sheet Fed Type Ink" (Printing Ink is dried by oxidative polymerization) (ii-a) Preparation of paint B

In a dissolving tank, with a stoker was equipped, were 40 parts Phenolic resin modified with a vegetable resin, and 30 parts polymerized flaxseed oil given. This mixture was at 220 ° C for about 1 hour touched. Subsequently, 30 parts Printing Ink Solvent 1 (see Table 1) to the mixture and stirring was continued until the resin had completely dissolved and the mixture then cooled. The resulting mixture (Paint B) had a viscosity of 35 Pa.s / 25 ° C (measured in a B-type viscometer).  

(ii-b) Preparation of Printing Inks E to H

Lacquer B and alkaline blue toner A, B, C or D, made in preparation 1, 2, 3 or 4, were mixed in the following quantities and on a three-roll chair with the addition of Adjustment solvent up to a "tack" value of 10.0 (400 rpm, 30 ° C, 1 minute, measured according to JIS K 5701) ground to obtain the Test ink E, F, G or H.

parts Carbon black (oil absorption 61 ml / 100 g, volatile content 3.9%, pH 2.5) 18 Paint B 60 Toner A, B, C or 10 Lacquer of 34 parts of rosin-modified phenolic resin, 24 parts of linseed oil, 42 parts of ink solvent and 1 part of gelling agent 5 Wax of 75 parts polyethylene wax and 75 parts linseed oil 5 cobalt 2

(ii-c) drying test

The drying properties of the printing inks E, F, G and H were examined by separating with the inks using an RI tester on 90 kg of paper with one Ink quantity of 0.15 ml per 1/2 cutting roller printed. The results achieved are described below shown.

Test ink Drying time (minutes) e 6 F 8th G 6 H 15

It can be seen that using the Alkali blue toner according to the invention, the drying times can significantly reduce, compared to printing inks, where alkaline blue toners were used under Application of the vehicle technology had been produced.

Claims (2)

1. Alkali blue toner composition, producible by Kneading and dispersing a water-containing alkali Blue pigment in the presence of a surfactant Means in an organic solvent with a Boiling point in the range of 150 to 400 ° C to the Time when it is distilled by 50 vol .-%. 2. Method for producing a Alkali blue toner composition, by characterized in that one hydrous alkali blue pigment in the presence of a surfactant in an organic Solvent with a boiling point in the range of 150 up to 400 ° C at the time when it is around 50% by volume distilled, kneaded and dispersed.