AQUEOUS INK JET INK
The invention concerns a Inkjet-ink, which contains contains a yellow dye, a magenta dye or a cyan dye, wherein said ink further an organic solvent, surfactant, humectant and optionally conventional additives. The ink jet printing or also Inkjet-pressure is a non-contact, direct Immediately-printing method without creating material printing form is based on thermal or electrophysical principles. The Transferring information to be printed in the form of individual ink drops onto a print medium, usually paper,. When continuous Jet-process is conducted from a continuous inkjet drop the, the exits with a static overpressure from a nozzle. Inspired, for example by means of a [...] , then the ink jet disintegrates into droplets of defined size & Nkulengu rail; e, under the action of a magnetic or electrostatic field, depending on the type of ink the in the desired manner are placed on the printing medium. Not drops are deflected into a required field Ink recirculation system. When drop "on-demand" with respect thereto, the drop on demand-process is conducted, i.e. by targeted electrical impulse control , a drop generator, the thereby enable an ink droplet from a nozzle. As drop generators serve as a rule, piezoelectric transducers, electromagnetic or electrostrictive transducer. The so-called bubble jet method adopts a position One particular a. This drop in the ink is effected by brief overheating a thermally The arranged heating element. The resulting vapor bubble displaces in a pulse-like manner over the heating element and leads the ink from the associated nozzle thereby for exit of a drop, which in turn is placed on the printing medium. Opposite the aforementioned method accounts for mechanically moving components during the bubble jet method. Since printheads with electrothermal transducers can be made so that, as a rule, smaller and cheaper than those having electromechanical transducer elements, to become more widespread in the market today have found-Printer bubble Jet. The in the paints used are periodically to & Nkulengu rail Inkjet-pressure; ig applying inks to water-or solvent-base having a viscosity of about 1 to 30 MPa [...] . They contain in addition to the particularly during bubble Jet-pressure for the vaporisation when substantial component water periodically to & Nkulengu rail; ig a mixture of different organic solvents (partly up to eight components for controlling the drying time), in particular (predominantly methyl ethyl ketone) ketones, acetates, glycol ether, pyrrolidones, glycols, glycerol and alcohols (e.g. ethanol). The solvent portion generally is in the drop on demand technology about 15 to 60 wt- %. When continuous Inkjet-procedure can be up to 98 wt % of the solvent content. The colorant, the periodically to & Nkulengu rail; ig an amount of about 2 to 6 wt. - % of the make up Inkjet-ink, are predominantly soluble dyes with high light fastness and thermostability, and partly insoluble pigments a [...] & Nkulengu rail; e below about 3 µm, in particular below 1 µm. It Is required, adjust an electrical conductivity is then periodically to & Nkulengu rail; ig a conductive salt as possible in order to achieve an electrical conductivity of more than 10 omega & 4 ;-1 cm-1 used. Sleeping the ink in the nozzles over time neither exsiccate still is to become incrusted. Generally the Ink Jet be added-inks for adjusting a sufficient Preservation Biocidal, so that they can be infected, for example, not of bacteria or mold. The Inkjet-inks must with the materials of the ink container, the be compatible ink inlet and the writing head; they must not be corrosive and, therefore, contain for example corrosion inhibitors. Other important parameters of the inks for the ink jet process are the viscosity, the surface tension and the pH value. Depending on the system that the environment in the physical values must be adapted to the requirements of the individual case the Inkjet-ink. It itself has shown that the known inks meet the above mentioned requirements not desirable, if they are used in ink containers or in cartridges. So it is desirable, the stability of the ink jet ink in the ink container or respectively of the cartridge to increase the flow of Inkjet-inks from the ink containers and or [...] . Cartridges with prevention of striation to improve. Moreover, the compatibility is to be improved with the residual ink of the ink container or respectively of the cartridge the ink. While there are proposals, here an improvement thereby to be achieved, by the proportion of the surfactants in the Inkjet-inks can be tendered is lifted so far, until these from the cartridges well. A to high proportion of surfactants has the disadvantage that is generally undesirably high foam formation occurs. So-called "fish eyes" At the same time, form, has what are present that interfering insoluble proportions. In particular, the problems are not remedied, when in the cartridge or the ink container is a sponge, of the bubbles can occur, the lead to a deteriorated expression. The invention was therefore based on the problem, the abovementioned problems raised with regard to the desirable flow of the inks from [...] ink containers or. Cartridges as well as to improve the stability of the ink in the cartridge or the ink container and to increase the compatibility of the respective ink in particular, when it is refilled, with the residual ink. It & Nkulengu rail; this problem is solved by an aqueous Inkjet-ink, the contains a yellow dye contains contains has, a magenta dye or a cyan dye, wherein the Inkjet-ink further an organic solvent and surfactants and optionally conventional additives, characterized, since & Nkulengu rail; the Inkjet-ink at least two surfactants different HLB value, wherein an HLB value of more than about at least one surfactant A 15 and at least one surfactant B of a HLB value from about 1 to 14, as well as a humectant. The term of the HLB value is known to the person skilled in the art. This has become a Ma & Nkulengu rail; for the [...] . Predominantly nonionic surfactants and emulsifiers constitute oil solubility of (of english. : hydrophilic-lipophilic-balance). The HLB value can be, for example, by determining the dielectric constants or colorimetrically determine (by gas chromatography). The HLB value of a from the values of its components additively [...] emulsifier-mixture can be calculated. The HLB value of 9.0 7.0 and lies generally between wetting agents, O/W emulsions between 8.0 and 18.0 from, 12.0 13.0 15.0 and from solubilizers between and between of surfactants and 18.0 (cf. [...]chemistry encyclopedia , [...] 9 ., 3 [...] , p. 1812, r. Sp., to p. 1813, [...] ). Core of the invention is that the [...] & Nkulengu rail; e Inkjet-ink contains at least two surfactants, in other words at least one surfactant A of a HLB value of greater than about 15 and at least one surfactant B of a HLB value from about 1 to 14. The surfactant having an HLB value of more than about 15 met A substantially the function that the surface tension in the desirable degree and lowered into the cartridge or the ink container in incorporating this saturated sponge. As a result, one prevents that the further surfactant is adsorbed in undesirably high proportion in the sponge B. The surfactant B having an HLB value of about 1 to 14 ensures that the Inkjet-ink according to & Nkulengu rail; of the invention in the application smoothly from the sponge or the Inkjet-nozzles [...] & Nkulengu rail; t. Otherwise undesirable strips on the printed image would occur. This phenomenon is being pushed back by the incorporated surfactant A further. The above advantageous results are achieved in particular then, when the HLB of the surfactant is greater than about 17 A, in particular between approximately 15 and 25 lies, during the HLB of the surfactant is preferably between about 4 and 13 B. The surfactant A of the designated HLB value or range preferably in the form of a polyalkylene oxide modified polydimethylsiloxane before. A particularly advantageous this kind is polydimethylsiloxane (I) on faces linearly and the following general formula:2 2 with the meaning of PE =-2 O (EO) m CH ( PO) CHn Z CH, wherein EO is an ethyleneoxy group, 1.2-propyleneoxy group and Z is either hydrogen or a PO a low alkyl radical, in particular an alkyl radical of 1 to 10 carbon atoms, particularly from 1 to 4 carbon atoms. Among the preferred alkyl radicals include, in particular the methyl-, ethyl-, propyl-, pentyl residue [...] as well as their isomers. [...] & Nkulengu rail; en it is advantageous, if one forms the designated polyalkylene oxide-polydimethylsiloxane modified in a manner that it is branched and the following general formula (II) comprises : (MeSi) [(OSiMe 2)x/y O- PE] y -2y ( [...] &; & [...] ; & [...] ; (II) with the meaning of PE = - (EO)m ( PO)n R, in which the various substituents have the meanings given in connection with the above formula (I) apply and R a lower alkyl radical having 1 to 10 carbon atoms, in particular 1 to 4 carbon atoms, wherein the above remarks about the preferred specific alkyl group here too. It is the [...] aware that the above formulae (I) and (II) an indefinite size & Nkulengu rail; en in the form of, for example, m, n and have xandy. Here there should be a formula act, indicating a directive to the person skilled in the art, as it can determine the appropriate materials can determine, for example on the basis of simple experiments using what he sees as a probable parameters the respective advantageous polydimethylsiloxane. Also in the choice of the surfactant B not subjected to any substantial restraint is subject to the invention, provided that the HLB value is between about 1 and 14. From special advantage it is, when the surfactant in the form of an ethylene glycol-surfactant of the following general formula B (III) is present: wherein R1, R2, R3 and R4, each independently, represent between 0 and the sum of n + m a lower alkyl radical and 30, in particular between 5 and 15 lies. It is particularly preferably such surfactant B When using a, when the raised alkyl radical 1 to 10 carbon atoms, in particular 1 to 4 carbon atoms. By [...] a particularly optimum coordination of the individual parameters of the & Nkulengu rail; en Inkjet-ink can be advantageously control the dynamic surface tension. The optimizing the dynamic surface tension a result, takes place as has been mentioned that an optimal effluent the Inkjet-ink from sponge and/or nozzles of the cartridge and also occur in the printed image no striae. This technical success is achieved in particular then, when the 20 °C Inkjet-ink at a temperature of (as measured with the method of the maximum bubble pressure) a dynamic surface tension of less than about 35 mN/m, in particular of approximately 20 to 30 mN/m. A commercially available product, the falls under the above-described formula of the surfactant A increases, leads to the result that the surface tension of the ink jet ink is reduced up to 25 mN/m, wherein the surfactant A in the cartridge during about four weeks at room temperature (RC) of a bound-sponge, particularly of polyurethane, polyester and/or a melamine resin to a large extent and in individual cases completely (100%) is received, whereby the surface tension to on 30 mN/m. The inclusion of the surfactant A by the sponge effected is that this "softer". In other words the sponge is saturated by the surfactant prevents or slows down more or less and the inclusion of other surfactants A. This a constant and stable flow is through the sponge allows of the inks. This surfactant is Removes Inkjet-ink or it binds A from the not a, then enter other surfactants with higher HLB value strips on B when incorporated. We increase the concentration of surfactant A to strongly dignity, could be reduced so as to saturate the sponge with surfactants occurs shows, then that is the striation, but this then the disadvantage that a discharge & Nkulengu rail; strength foaming of the ink. The plurality of the surfactants has the disadvantage A, seethe that they in aqueous solution, in other words in the production of Inkjet-ink [...] of cartridges or, as well as the. Ink Container. Therefore it is, as it expresses the invention, necessary, other surfactants B having an HLB value of about 1 to 14 to use, which provide for, in this case that no foam occurs or they act as a defoaming agent. Deploying the surfactant is subject to no critical limitation with respect to the amount and said B A. It is preferably, at a concentration of about 0.01 to 1 when the surfactant A, 1% by weight, in particular approximately 0.05 to 0.7 wt- %, 0.01 to 1 and the surfactant at a concentration of about B, 1% by weight, in particular from about 0.1 to 0.7 wt. - % is present. Even over the content of organic solvents is subject to no substantial restriction the present invention. It is the usual solvent. Here as preferred examples are diethylene glycol, triethylene glycol, butyl diglycol, glycerol, 2-pyrrolidone, primary, secondary and tertiary alcohols, such as, in particular, 1.5-pentanediol, propanol, butanol, etc.. It & Nkulengu rail; it is necessary, of the claimed Inkjet-ink incorporating humectant. Humectant State sind of the Art removable the. The following is to be carried out here, however, : are particularly suitable glycols, such as diethylene glycol, triethylene glycol and diethylene glycol butyl ether, glycerin, and urea and/or [...] . A particularly favorable humectant is also 1.1,1- [...] . Part of the humectant, such as diethylene glycol, triethylene glycol, butyl diglycol and/or glycerol, can exert the function of a solvent in addition. As a further suitable humectant can be mentioned: ethylene oxide adducts of polyhydric alcohols, higher functional alcohols, as tetravalent alcohol, especially pentaerythritol, pentavalent alcohols ( [...] ), in particular arabitol, adonitol and xylitol, and also (hexitols) hexavalent alcohols, in particular sorbitol, mannitol and dulcite. From special advantage are urea and/or urea derivatives as a humectant, wherein among urea derivatives dimethylurea particularly is preferred. The desirable damp retaining effect is obtained preferably in a frame of about 3 to 35 wt. - %, in particular about 5 to 30 wt. - % humectant in the ink jet ink, most preferably in the frame of about 5 to 20 wt- %. A would not be sufficiently effective to small amount, while a 35 wt. - % would lead to an exceeding of the value of that would attach to the ink has a high viscosity. In the event that urea and/or a urea derivative is used as a humectant, these are located in the [...] & Nkulengu rail; en Inkjet-ink preferably in an amount of about 3 to 10 wt. - %, in particular about 3 to 7 wt. - %. The type of each case in the [...] & Nkulengu rail; en ink dyestuffs contained is not limited. It is usually containing Inkjet-inks used yellow colorants, magenta dyes as well as cyan dyes. It 143 and are preferably at the yellow dyes Direct Yellow Acid Yellow 23, wherein the magenta dyes Acid Red 52,23 and 27 and in the Reactive Red Acid Red cyan dyes Acid Blue Direct Blue 9 and it can also be an advantage. 199 In individual cases, in addition to the dyes to use ultra-fine pigments, in particular a [...] & Nkulengu rail; e of less than 500 nm. The Dyestuffs [...] & Nkulengu rail are in the; en Inkjet-ink quantity framework contained in the usual, in particular in an amount of about 1 to 5 wt- % and most of about 2 to 4,5% in weight. To [...] & Nkulengu rail is to be set to release the; formulated task particularly optimally, the pH value suitable advantageous. This lies between 5 and 10 is preferred, in particular between 6 to 9. That is, in particular that the above-mentioned problems are remedied and the involvement of corrosion inhibitors is not required the corrosiveness. To set the pH value are used in particular primary, secondary and/or tertiary amines, wherein the alkanolamine, especially triethanolamine is preferably. To set the pH value could also, for example, sodium hydroxide solution, any acids, buffer, such as ammonium acetate and the like are used. The person skilled in the art it is possible, the [...] & Nkulengu rail; e Inkjet-ink therethrough to improve, by further customary additives, depending on requirements profile, are used. It it can act, for example, stabilizers and/or preservatives. Ethylenediaminetetraacetic acid (EDTA), for example, counts the stabilizers To. Such preservatives may be indicated as particularly advantageous, the are to be assigned to the following groups: [...] Isothiazol compounds. It can also be favorable for the hoped-for outcome In individual cases that the aqueous Inkjet-ink contains a evaporation aid . This is a readily vaporizable liquid, the falls preferably is miscible with water and under the optional features "further additives". For example, it can act to lower alcohols, in particular those having about 1 to 4 carbon atoms. Are Preferably, methanol, ethanol, propanol, isopropanol, butanol, pentanol and their isomers. Especially advantageous is isopropanol. The related properties be found, in particular therein that the Inkjet-ink on the paper is more quickly dried and the improved smear resistance. The appropriate concentration is easily evaporation aid For the use of the adjusting person skilled in the art. However, generally includes exceeding a ceiling of about 10 to 12 wt. - % not to recommend. This can lead during [...] & Nkulengu rail; the ink from the nozzles to form undesirable satellite Satellites and hence to a reduction of the print quality, in particular the edge acuity and the printing contrast . Above to a Inkjet-ink also has been mentioned is contained in a cartridge or a cartridge, which contains additionally a sponge. This met among other things, a memory function. It has shown in practice that the [...] & Nkulengu rail; en Inkjet-inks and solve the formulated task are of particular advantage, when this sponge is not made of any material, but in particular of a material based on polyurethane, polyester and/or of a melamine resin. Such a sponge material a result that the formulated task in desirable degree is solved. It also has shown that the [...] & Nkulengu rail; en Inkjet-inks show a desirable stability of the surface tension. The same goes for the viscosity of the ink. The [...] & Nkulengu rail with the; en ink recoverable advantages are also to be seen therein that it to an improved flow from [...] cartridges or. Cartridges lead and prevent striation upon expression. Also it has been shown that then, when the cartridges or. Cartridges are newly filled after use, the filled ink residual ink shows an optimal compatibility with the. At worst can be the dye. In any event, it is readily apparent that the aqueous Inkjet-ink according to & Nkulengu rail; their implementation will take place in a cartridge with a sponge of the invention, wherein it is contained in the sponge. Therefore materialized the invention not only in the aqueous Inkjet-Ink and its use in a cartridge containing a sponge, wherein the sponge in particular based on polyurethane, polyester and/or of a melamine resin is based, but also in the designated cartridge with a sponge and therein contained Inkjet-ink. The invention is below with reference to various formulations, from which emerges the qualitative and quantitative composition, are explained in more detail: The preceding positions 1 to 14 are [...] & Nkulengu rail in the production of the; en Inkjet-ink in the above mentioned order and about 2 hours stirred added together. Afterwards is filtered. The Inkjet-ink is directly insertable. The preceding positions 1 to 14 are [...] & Nkulengu rail in the production of the; en Inkjet-ink in the above mentioned order and about 2 hours stirred added together. [...] & Nkulengu rail; end is filtered. The preceding positions 1 to 14 are [...] & Nkulengu rail in the production of the; en Inkjet-ink in the above mentioned order and about 2 hours stirred added together. [...] & Nkulengu rail; end is filtered. It is readily apparent to the person skilled in the art that the compilation the quantitative and qualitative material name The assemblage of the examples 1 to 3 represent a directive is to be only and not in a restrictive way. Aqueous ink-jet ink containing yellow, magenta or cyan dye, organic solvent and optionally other additives, contains at least two surfactants with different HLB values, comprising at least one surfactant (A) with an HLB value of more than 15 and at least one (B) with an HLB value of 1-14, plus a moisture-retention additive (C). An ink-jet print cartridge containing an aqueous ink-jet ink comprising a yellow dyestuff, a magenta dyestuff or a cyan dyestuff, an organic solvent, surfactants and other additives if required, characterised in that the ink-jet ink contains at least two surfactants with different HLB values and 1 to 10 wt.% urea and/or a urea derivative, wherein at least one surfactant A has an HLB value between 15 and 25 and at least one surfactant B has an HLB value of 1 to 14, the surfactant A is present in a concentration of 0.01 to 1.5 wt.% and the surfactant B is present in a concentration of 0.01 to 1 wt.%, the ink-jet ink has a pH of 5 to 10 and a dynamic surface tension of less than 35 mN/m at a temperature of 20°C and the cartridge contains a sponge for holding the ink-jet ink. A cartridge according to claim 1, characterised in that the ink-jet ink contains 3 to 7 wt.% urea and/or a urea derivative. A cartridge according to claim 1 or claim 2, characterised in that the HLB value of the surfactant B is between 4 and 13. A cartridge according to any of claims 1 to 3, characterised in that the ink-jet ink has a dynamic surface tension of 20 to 30 mN/m at a temperature of 20°C. A cartridge according to any of claims 1 to 4, characterised in that the surfactant A is polyalkylene oxide-modified polydimethyl siloxane. A cartridge according to at least one of the preceding claims, characterised in that the ink-jet ink contains the surfactant A in a concentration of 0.05 to 0.7 wt.% and/or the surfactant B in a concentration of 0.01 to 1 wt.%. A cartridge according to at least one of the preceding claims, characterised in that the ink-jet ink contains a moisture-retaining means in the form of diethylene glycol, butyl diglycol and/or glycerol. A cartridge according to at least one of the preceding claims, characterised in that the ink-jet ink has a pH of 6 to 9. A cartridge according to claim 8, characterised in that the ink-jet ink contains a primary, secondary and/or tertiary amine, especially an alkanolamine for adjusting the pH. A cartridge according to claim 9, characterised in that the alkanolamine is triethanolamine. A cartridge according to at least one of the preceding claims, characterised in that the ink-jet ink contains a stabiliser and/or a preservative. A cartridge according to at least one of the preceding claims, characterised in that the sponge material is based on polyurethane, polyester and/or a melamine resin.Example 1
1. demineralized water 52.65 2. Glycols (diethylene glycol and/or butyl diglycol) 10.0-20.0 3. Glycerol (99.5%) 3.0-9.0 4. Urea 2.0-10.0 5. Surfactant ( [...] & Pentium; 104 Pa) B acetylated glycol 0.15 6. Surfactant ( [...] & Pentium; 465) B 0.50 7. Surfactant ( [...] & Pentium; 440) B 0.10 8. Surfactant ( [...] L 7607) A 0.15 9. Triethanolamine 0.10 10. EDTA 0.05 11. Preservative ( [...] LA) (Biocide) 0.10 12. yellow dye (Direct Yellow 132) 0.2-2.0 13. yellow dye (Acid Yellow 23) 10.0-20.0 Example 2
1. demineralized water 31.26 2. Glycols (diethylene glycol and/or butyl diglycol) 10.0-20.0 3. Glycerol (99.5%) 3.0-9.0 4. Urea 2.0-10.0 5. Surfactant ( [...] & Pentium; 104 Pa) B acetylated glycol 0.15 6. Surfactant ( [...] & Pentium; 465) B 0.50 7. Surfactant ( [...] & Pentium; 440) B 0.10 8. Surfactant ( [...] L 7607) A 0.15 9. Triethanolamine 0.04 10. EDTA 0.20 11. Preservative ( [...] LA) (Biocide) 0.10 12. blue dye (Acid Blue 9) 0.5-2.0 13. blue dye (Direct Blue 196) 30.0-40.0 Example 3
1. demineralized water 31.26 2. Glycols (diethylene glycol and/or butyl diglycol) 10.0-20.0 3. Glycerol (99.5%) 3.0-9.0 4. Urea 2.0-10.0 5. Surfactant ( [...] & Pentium; 104 Pa) B acetylated glycol 0.15 6. Surfactant ( [...] & Pentium; 465) B 0.50 7. Surfactant ( [...] & Pentium; 440) B 0.10 8. Surfactant ( [...] L 7607) A 0.15 9. Triethanolamine 0.04 10. EDTA 0.20 11. Preservative ( [...] LA) (Biocide) 0.10 12. red dye (Acid Red 52) 0.1-0.8 13. red dye (Acid Red 27) 20.0-40.0