The method of obtaining ink

 

(57) Abstract:

Describes how to obtain elektronoprovodyaschego ink from elektronoprovodyaschego coloring particles and elektronoprovodyaschego liquid media. The method includes the steps of applying to the surface elektronoprovodyaschego coloring particles of insulating material having high electrical resistivity, for imparting to the particles of higher specific surface resistance and mixing the treated dye particles with the conductive media. Insulating material selected from polymers, waxes, organic pigments and dyes, and coloring particles of carbon black, magnetic iron oxide, or metal powder. 3 C. and 20 C.p. f-crystals, 1 table.

The invention relates to the field of ink, in particular ink for ink-jet printing devices, and also relates to a method of obtaining pigments for such ink.

New technology inkjet ink printing is described in WO-A-9311866 (Research Laboratories of Australia Pty Limited) and published on 24 June 1993. This method provides for obtaining droplets of variable size, which contain a high concentration of specific veshecco microns while using pigments as coloring material. This is because the droplet size controls the first voltage magnitude at the point of injection, and the ability of the particles to be charged, and therefore the droplet size is not limited by the size of the injection nozzle. In addition, the coloring material is concentrated on the emitted droplets. Consequently, you can obtain high-resolution images with high density-based particles, resistant to light and water.

It is known that to improve the performance characteristics of the ink used in the above ink-jet ink printing device must have a specific volume resistance of more than 109OSM to provide a mechanism drop. In addition, the conductivity of the emitted particles must be sufficiently low in order to have a sufficiently high resistivity ink. Inks that contain a large number of conductive particles, it is difficult to use for the printing process, and they do not provide high printing stability. I believe that this is mainly due to the fact that high local concentrations of these conductive particles may form in the system prostranstvenny system.

There are several important industrial marking particles, which have high conductivity, and therefore not very suitable for optimal process inkjet ink printing, which is described in WO-A-9311866. The most important of these particles are particles of carbon black, magnetic iron oxide, metal powders, however, the invention is not limited to the above substances and their use as a pigment for ink.

In standard printing device as a black pigment most commonly used carbon black (pigment black 7, CI). The pigments on the basis of technical carbon is produced by the incomplete combustion of organic (carbon-based) fuels. This pigment usually consists of elemental carbon in combination with residual volatile substance in an amount up to 20%, with the exact composition depends on the type of fuel, the method and conditions for obtaining the composition. It is established that the surface characteristics of carbon black, including the conductivity or the resistivity of the particles, mainly depend on the number and type of volatile substances present.

Carbon black has with what honostly to acids, alkaline soap and solvent, has a high siteproject and relatively low cost.

These properties make carbon black suitable for use as a marking particles in many printing technologies, however, carbon black has an inherent high specific conductivity, and therefore, the use of ink on the basis of the above-mentioned printing technology is not the optimal solution.

Magnetic iron oxide occurs in nature as the mineral magnetite. Alternative it can be synthesized in various ways, such as the precipitation of hydrated ferric oxide (III) from a solution of iron salts with subsequent dehydration and reduction with hydrogen. This substance is for the black pigment is characterized by a strong permanent magnetism. Industrial use of magnetic iron oxide includes the manufacture of magnetic ink for printing RSMC information (character recognition magnetic ink).

These particles of magnetic iron oxide have a high conductivity and therefore, although they are used as marking particles, their use in the above-mentioned technologies ink page the Examples are CI Metallic pigment 2, which is an alloy of copper and zinc, Metal and CI pigment 1, which is powdered aluminum. The use of metal powders for printing includes a decorative marking and printing of conductive targets. Of course it should be borne in mind that the metal powders are inherently electrically conductive, and therefore do not provide optimal printing in the case of the above-mentioned technology inkjet ink printing.

As mentioned previously, the present invention is not limited to these substances.

The objective of the invention is a method of reducing the magnitude of the conductivity of such pigment particles and obtaining ink using such particles with low specific conductivity or high resistivity.

Found that electrically conductive particles, such as particles of carbon black, magnetic iron oxide, metal powders, etc. can be modified to reduce the size of their conductivity. This is achieved by mixing a conductive pigment with a non-conductive material or an insulator. Composite marking particles thus obtained, have them form, although, perhaps this is not the only and most broad form, the invention is a method of obtaining particles having high resistivity or low electrical conductivity, for the use of this substance in the ink composition, and source particles have a low resistivity or high conductivity, the method includes the operation of applying to the surface of the particles of matter, which is an insulator.

In another embodiment, the present invention is a method of obtaining elektroprovoda ink, namely ink comprising coloring particles, and elektroprovodyashchie carrier liquid in which the coloring particle has a low electrical resistivity, and the method includes the steps of applying to the surface of the particles of material having high electric resistance, in order to give the particle a higher surface resistivity, and mixing the treated particles with a non-conductive carrier with the aim of obtaining a non-conductive ink.

Examples of insulating materials suitable for application to the surface of the conductive particles are poly is Ana for application to the surface of the electrically conductive pigments, are epoxy resins such as bisphenol-A-epoxy resin, Novolac epoxy resins and cycloaliphatic epoxy resins; acrylic resins, such as polymers and copolymers of acrylic acid and their esters, polymers and copolymers of methacrylic acid and their esters; vinyl resins such as polymers and copolymers comprising vinyl acetate, vinyl chloride, vinyl alcohol and vinylbital; alkyd resins, such as Alcide, modified oils, phenol or rosin, and finally, the modified esters of rosin, such as dimenisonal ester of pentaerythritol and rosin.

Examples of waxes that may be used for deposition on the surface of the electrically conductive pigments are natural waxes, such as shellac wax, beeswax, Carnauba wax and hydrogenated castor oil; petroleum waxes such as paraffin wax and microcrystalline wax; mineral wax such as Montan wax; synthetic waxes such as polyethylene wax, chlorinated hydrocarbon wax and amide wax.

Examples of dyes that can be used for deposition on the surface of the electrically conductive pigments are OS the CI Solvent black 29, CI Solvent Blue 49, CI Solvent red 7.

Examples of organic pigments that can be used for deposition on the surface of the electrically conductive pigments are CI Pigment Yellow 1, CI Pigment yellow 14, CI Pigment Red 48:2, CI Pigment Red 122, CI Pigment Blue 15:3, CI Pigment Blue 18.

An example of the effects of the range of values of the electrical resistivity on the productivity of printing is the fact that the change of resistivity of from 100 to 125 OSM leads to a significant improvement. The actual improvement in performance characteristics of individual substances may depend on the initial values of resistivity, the type of surface treatment or coating, and the desired final properties of these inks.

If particles obtained with modified resistivity or specific conductivity, ink for inkjet printing according to this invention can be obtained by dispersing the modified dye particles and other components in a non-conductive fluid. For this purpose, can be used in a variety of equipment such as ball mills, Burr mills, three-roll melinau may be any suitable liquid, possessing the characteristics mentioned above. Examples of such liquids are aliphatic hydrocarbons such as hexane, cyclohexane, sodacan, Isopar (a mixture isoparaffins with a boiling range 160-174oC and a flash point 41oWith) (production echop) and Shellsol T (a mixture isoparaffins with a boiling range 187-213oC and a flash point of 60o(C) (manufactured by Shell); aromatic hydrocarbons, such as xylene, toluene, and Solvesso 100 (mixture of aromatic hydrocarbons with a boiling range 163-180oC and a flash point 49oWith) (production echop); chlorinated solvents such as chloroform and diethylaniline; silicone fluid or oil, such as dimethylpolysiloxane, such as DC 200 (manufactured by Dow Corning), cyclic dimethylpolysiloxane, for example DC 345 (manufactured by Dow Corning) and vegetable oils such as olive oil, safflower oil, sunflower oil, soybean oil or linseed oil.

Other components that can be added to the ink, are binders, stabilizers, viscosity agents, charging particles and other such components.

The actual method of applying an insulating material on a surface of the colorant, it can be dissolved in such a solvent, in which particles, the surface of which is required to process, insoluble, and the mixture is dissolved dye and pigment particles can be mixed, for example, in a roll mill or similar equipment up until the dye not adsorbed on the surface of the pigment particles. The solvent can then be removed from the particles by obtaining a dispersion agent with a modified surface, which can be used to obtain ink.

If the insulating material is a wax, dye particles can be mixed with molten wax dispersion particles in the wax, then the dispersion is cooled and returned to the solid state, and the obtained solid material can be crushed to obtain a fine substance, which then can be used to prepare an ink in accordance with this invention. Clear wax will not affect the acquired color of the obtained particles.

In the case of organic pigments two materials can be subjected to joint grinding to obtain composite particles having the desired high insulation properties.

In the case of polymers, these materials and cooling becomes covered at least partially. In addition, the pigment particles can be mixed monomers of the polymer, followed by polymerization of the coating.

In each of these cases, the degree of canopy condition may be such so as not to affect the desired properties such as color, but at the same time to affect the bulk conductivity of the pigment particles and the total value of volume resistivity of the obtained ink.

It is obvious that this invention receive particles from the surface electrical properties that are modified to such an extent that the particles can be used as colorants in the non-conductive ink for the above-mentioned technology of inkjet printing.

It generally describes the invention but to facilitate understanding of the following examples, in which is shown a modification of the properties of carbon black, as well as getting ink on the basis of such modified pigment particles. Of course, it should be understood that similar methods may be used for other electrically conductive particles, such as particles of magnetic oxide of iron and metal powders.

EXAMPLES

Technical carbon particles were treated so, for the 300 - 15

Reflex blue 3G - 3

Denatured methylated spirits - 150

The ingredients are placed in a 500 ml dryer and mixing in a ball mill for 3 hours. Pour the open tray and drying the suspension to air-dry state.

Modification of pigment 2, g

Mentakab 300 - 50

Polyethylene as 6 - 50

Polyethylene wax heated to melting (100oC). Add mentakab and stirred in a disperser for 15 min, then cooled to return to the solid state.

Modification of pigment 3, g

Example 1 (coloured pigment) - 45

Irgolic blue LGLD - 15

Polyethylene as 6 - 40

Polyethylene wax heated to melting (100oC). Add the ingredients of the pigment and stir in the disperser for 15 min, then cooled to return to the solid state.

The results of determination of the bulk resistivity of these particles compared to the control data for carbon black is shown in the table.

On the basis of modified pigments, prepared as above, were obtained ink according to the examples below.

The ink formulations, g

Ink 1 (control)

T who're asked in a ball mill for 72 hours

Ink 2

Modification of pigment 1 - 25

Araldit GT 6084 - 25

FOA-2 - 5

DC 344 - 420

6% Zirconium Nuxtra - 25

All the ingredients are mixed in a ball mill for 72 hours

Ink 3

Modification of pigment 2 - 25

Araldit GT 6084 - 25

FOA-2 - 5

DC 344 - 420

6% Zirconium Nuxtra - 25

All the ingredients are mixed in a ball mill for 72 hours

Ink 4

Modification of pigment 3 - 25

Araldit GT 6084 - 25

FOA-2 - 5

DC 344 - 420

6% Zirconium Nuxtra - 25

All the ingredients are mixed in a ball mill for 72 hours

All ink formulations were tested in the jet ink printing device described in WO-A-9311866, to produce images of bond paper. Ink 1 showed an uneven emission of drops and poor stability of droplet sizes. In addition, it was found that the particles cover the injection tip, causing the termination of ejection in a few minutes.

Ink (2), (3) and (4) showed similar improved results: the injection tip was not observed buildup emitted jet was uniform and regulated.

Mentakab 300 is a carbon black pigment black 7, CI, production Cabo this pigment blue 15:3 production Ciba Geigy.

AC-6 is a polyethylene wax production Allied Signal.

Araldit GT 6084 - it epoxy resin production Ciba Geigy.

FOA-2 - this oil additive manufacturing DuPont.

6% Zirconium Nuxtra is the solution octanoate Zirconia in white-spirit, manufacturing Huls America Inc.

DC 344 is a silicone fluid of Dow Corning.

This description describes the various instructions relating to the scope of the present invention, but the invention is not limited to any one of them, but may include two or more of them taken together. Examples are given only for illustration and not for limitation.

In the description and the subsequent formula, if the context is not referring to something else, the words "include" or "including" should be understood as the inclusion of this component or group of components, and not the exclusion of any component or group of components.

1. The method of obtaining elektronoprovodyaschego coloring particles for use in elektronoprovodyaschego ink for inkjet printing, comprising the operation of applying to the surface of the electroconductive particles of insulating material selected from the group comprising polymers, waxes, organic pigments Oia elektronoprovodyaschego coloring particles and mixing these particles with electronproton liquid carrier, characterized in that elektronoprovodyaschie coloring particles obtained by coating an insulating material on the surface of the electroconductive particles for imparting these particles with higher specific surface resistance.

3. The method of obtaining elektronoprovodyaschego ink on p. 2, in which the insulating material is selected from the group comprising polymers, waxes, organic pigments and dyes.

4. The method of obtaining elektronoprovodyaschego ink on p. 3, wherein the polymer is selected from the group comprising epoxy resin, acrylic, vinyl, alkyd and modified esters of rosin.

5. The method of obtaining elektronoprovodyaschego ink on p. 4, in which the epoxy resin is selected from the group comprising bisphenol-A-epoxy resin, Novolac epoxy resin and a cycloaliphatic epoxy resin; acrylic resin selected from the group comprising polymers and copolymers of acrylic acid and their esters, polymers and copolymers of methacrylic acid and their esters; vinyl resin selected from the group comprising polymers and copolymers comprising vinyl acetate, vinyl chloride, vinyl alcohol and vinylbital; alkyd resin selected from the group on predstavljaet dimenisonal ester of pentaerythritol and rosin.

6. The method of obtaining elektronoprovodyaschego ink on p. 3, wherein the wax is selected from the group including natural waxes, petroleum, mineral and synthetic.

7. The method of obtaining elektronoprovodyaschego ink on p. 6, in which a natural wax selected from the group including waxes, shellac, beeswax, Carnauba and hydrogenated castor oil; petroleum wax selected from the group comprising paraffin wax and microcrystalline wax; mineral wax is a Montan wax, and synthetic wax selected from the group including polyethylene waxes, chlorinated hydrocarbon and amide.

8. The method of obtaining elektronoprovodyaschego ink on p. 3, in which the dyes are selected from the group comprising basic dyes and soluble in organic solvents dyes.

9. The method of obtaining elektronoprovodyaschego ink on p. 8, in which the basic dye is a CI Basic blue 26, and soluble in organic solvents, the dye is selected from the group comprising CI Solvent Black 29, CI Solvent Blue 49, CI Solvent Red 7.

10. The method of obtaining elektronoprovodyaschego ink on p. 3, in which an organic pigment selected from the group vkluchaya the t Blue 18.

11. The method of obtaining elektronoprovodyaschego ink on p. 3, in which the value of the specific electrical resistance of the coloring particles is increased by at least 25 ASM.

12. The method of obtaining elektronoprovodyaschego ink on p. 2, in which a non-conductive carrier liquid selected from the group including aliphatic hydrocarbons, aromatic hydrocarbons, chlorinated solvents, silicone fluids or oil and vegetable oil.

13. The method of obtaining elektronoprovodyaschego ink on p. 12, in which the aliphatic hydrocarbon is selected from the group comprising hexane, cyclohexane, sodacan, Isopar and Shellsol T; aromatic hydrocarbon selected from the group including xylene, toluene, and Solvesso 100; chlorinated solvent selected from the group comprising chloroform and diethylaniline; silicone fluid or oil selected from the group including dimethylpolysiloxane and cyclic dimethylpolysiloxane; vegetable oil selected from the group including olive oil, safflower, sunflower, soybean or linseed.

14. The method of obtaining elektronoprovodyaschego ink on p. 13, in which dimethylpolysiloxane is DC 200, and cyclic dimethylpolysiloxane - DC 345.

15. Poverennye from the group containing binders, stabilizers, viscosity agents, charging particles, and preservatives.

16. The method of obtaining elektronoprovodyaschego ink on p. 3, in which the insulating material is non-conductive colorant, which includes operations of the dissolution of the dye in the solvent in which the particles, the surface of which is required to process, insoluble, mixing the dissolved dye and pigment particles in a roll mill up until the dye not adsorbed on the surface of the pigment particles, and removing the solvent to obtain particles with a modified surface, which then is mixed with a non-conductive liquid carrier.

17. The method of obtaining elektronoprovodyaschego ink on p. 3, in which the insulating material is a wax, comprising the operations of melting wax, mixing wax with dye particles for dispersion of the particles in the wax, cooling the dispersion to return to the solid state and grinding the mixed materials to obtain particles with a modified surface, which then is mixed with a non-conductive liquid carrier.

18. The method of obtaining elektronoprovodyaschego ink on p. 3, in which isolation the ment with the coloring particles to obtain particles with a modified surface, who then is mixed with a non-conductive liquid carrier.

19. The method of obtaining elektronoprovodyaschego ink on p. 3, in which the insulating material is a polymer, which includes operations of the dissolution of the polymer in the solvent in which insoluble particles, the surface of which need to be processed, the particles are mixed with the resulting solution, and the surface of the particles becomes at least partially coated with the polymer, and removing the solvent to obtain particles with a modified surface, which then is mixed with a non-conductive liquid carrier.

20. The method of obtaining elektronoprovodyaschego ink on p. 3, in which the insulating material is a polymer, which includes operations of the melting point of the polymer, mixing the polymer melt with the coloring particles for dispersion of the particles in the polymer, cooling the dispersion to return to the solid state and grinding the mixed material to obtain particles with a modified surface, which then is mixed with a non-conductive liquid carrier.

21. The method of obtaining elektronoprovodyaschego ink on p. 3, in which the insulating material is a polymer derived from monomer during his Nan which need to be processed, particles are mixed with the resulting solution, and the surface of the particles becomes at least partially covered by the monomer, solvent removal and curing of the monomer in the polymer to obtain particles with a modified surface, which then is mixed with a non-conductive liquid carrier.

22. The method of obtaining elektronoprovodyaschego ink on p. 2, in which the dye particles consist of a material selected from the group comprising carbon black, magnetic iron oxide and metal powder.

23. Elektronoprovodyaschie ink, including elektronoprovodyaschie coloring particles and elektronoprovodyaschie carrier, characterized in that elektronoprovodyaschie coloring particles obtained by the method according to p. 1.

 

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