Composition for dyeing a substrate, and use of same

Abstract

The present invention relates to a composition for dyeing a substrate. The invention also relates to a method for producing a dyed substrate. The invention also relates to the use of the composition for dyeing a substrate to produce a fully or partly alkaline-soluble film on a substrate.

Description

[0001] Composition for coloring a substrate and use thereof

[0002] Field of the invention

[0003] The present invention relates to a composition for coloring a substrate.

[0004] The invention further relates to methods for producing a colored substrate. The invention also relates to the use of the composition for coloring a substrate to produce a completely or partially alkali-soluble film on a substrate.

[0005] Background of the invention

[0006] Aqueous inks are well known in the art and typically contain water as the solvent and pigments or water-soluble dyes as the colorant. They also typically contain other additives, such as surfactants, emulsifiers, preservatives, or humectants.

[0007] Pigmented inks (paints) have been known for many years, particularly for artistic applications (painting, drawing, etc.). These are often formulated with polymer dispersions as binding agents and / or with wetting agents. After the ink has dried on a substrate, the color coatings exhibit water permanence, meaning they remain largely intact even after contact with water. This is due to the fact that the pigments are inherently water-insoluble and, in addition, migrate along with the binding agent into the absorbent substrate, making them difficult to remove again.

[0008] For many artistic applications, however, the use of watercolor techniques is desirable or necessary. This involves blending different layers of paint applied side by side or on top of each other to create smooth transitions between the layers. This is not possible, or only insufficiently, with paints that are highly resistant to water.

[0009] According to the current state of the art, sugar, sugar alcohols, or corresponding derivatives are often added to binder-based paints. This can improve watercolorability.

[0010] EP 3 613 814 Bi describes, for example, a writing, marking and / or drawing fluid, in particular an aqueous, pigmented and / or water-based writing, marking and / or drawing fluid, which contains an aqueous pigment preparation, a binder, a base, sugar or sugar alcohols and a dispersing wetting agent, wherein an aqueous solution of a modified polymer with pigment-affinic groups is contained as the dispersing wetting agent.

[0011] However, the improved watercolorability achieved in this way comes with disadvantages. In the art sector, two different product lines are generally required: the first product line comprises watercolorable and thus water-sensitive inks, while the second product line provides permanent inks that dry to become water-resistant even on non-absorbent substrates. It is not uncommon for each product line to offer more than 60 different color shades. Developing and providing two different product lines therefore involves high costs and effort for the manufacturer. The end user is also often forced to limit themselves to one product line for cost reasons.

[0012] A further disadvantage is that the smear produced with coloring compositions according to the state of the art easily dissolves when painted over with a different color and smears it or the dissolved color soils the tip of the pen.

[0013] Object of the invention

[0014] It is therefore the object of the present invention to provide a composition for coloring a substrate which overcomes the disadvantages of the prior art, in particular to provide a coloring composition which is adjustable in water resistance and water-soluble, ie which combines the described advantages of both ink classes and avoids the disadvantages.

[0015] Disclosure of the invention

[0016] This object is achieved according to the subject matter of the independent claims. Preferred embodiments emerge from the subclaims and the following description.

[0017] The object is achieved in particular by a composition for coloring a substrate, comprising:

[0018] - 20 to 80 wt% water;

[0019] - 0.025 to 12.5% ​​by weight of a colorant; and

[0020] - 5 to 45% by weight of a binder; each based on the total weight of the composition; wherein the binder has an acid number of at least 40 mg KOH / g dry substance; and the composition has a pH of at most 7.5.

[0021] The object is further achieved by a method for producing a colored substrate, comprising:

[0022] - Providing a substrate; - Applying the composition for coloring a substrate according to the present invention to at least a portion of at least one surface of the substrate and optionally drying the composition to obtain a first film;

[0023] - Providing a watercolor composition comprising:

[0024] - 40 to 99.5 wt% water; and

[0025] - 0.5 to 10% by weight of base, based on the total weight of the watercolor composition;

[0026] - applying the watercolor composition to at least part of the first film to obtain an at least partially dissolved first film;

[0027] - watercolouring the at least partially dissolved first film to obtain a watercoloured film; and

[0028] - Drying the watercolored film to obtain a second film.

[0029] Finally, the object is achieved by the use of the composition for coloring a substrate according to the present invention for producing a completely or partially alkali-soluble film on an absorbent substrate.

[0030] Composition for coloring a substrate

[0031] The composition according to the present invention is suitable and preferably intended for coloring a substrate.

[0032] dyeing

[0033] Coloring preferably includes or consists of writing, drawing, painting, printing or a combination of two or more of these.

[0034] Substrat

[0035] The substrate is preferably an absorbent substrate, for example an absorbent writing support, more preferably drawing board or paper, particularly preferably watercolor paper, or a non-absorbent substrate, for example a plastic substrate, particularly preferably a plastic film, or a mixed media substrate, i.e., a combination of different absorbent and non-absorbent materials, or a canvas. Any other suitable substrate, such as wood, stone, eggshells, etc., may also be provided. Water

[0036] The composition according to the invention for coloring a substrate contains water in an amount of 20 to 80% by weight, based on the total weight of the composition. It is preferred that deionized or demineralized water be used as the water. This makes it possible to avoid the introduction of unwanted contaminants, such as hardness-forming substances like calcium and magnesium, or similar.

[0037] The composition may contain water as the predominant solvent, preferably in an amount of at least 90% by weight, based on the total amount of solvent in the composition. It is particularly preferred that the composition contains water as the sole solvent.

[0038] It is preferred that the composition contains water in an amount of at least 25% by weight, more preferably at least 30% by weight, most preferably at least 35% by weight, in each case based on the total weight of the composition.

[0039] It is preferred that the composition contains water in an amount of at most 75% by weight, further preferably at most 70% by weight, further preferably at most 65% by weight, more preferably at most 60% by weight, most preferably at most 55% by weight, for example at most 52.15% by weight, in each case based on the total weight of the composition.

[0040] It is preferred that the composition contains water in an amount of 25 to 75 wt.%, more preferably 30 to 60 wt.%, most preferably 35 to 55 wt.%, in each case based on the total weight of the composition.

[0041] With the specified preferred amounts of water in the composition, an optimized coloration on the one hand and applicability on the other hand could be achieved.

[0042] Additional solvent

[0043] It may be provided that water is the only solvent in the composition according to the invention for dyeing a substrate. Alternatively, it may be provided that the composition according to the invention for dyeing a substrate comprises another solvent in addition to water.

[0044] It can be provided that the composition for coloring a substrate contains the further solvent in an amount of at least 1 wt.%, particularly preferably at least 5 wt.%, most preferably at least 10 wt.%, in each case based on the total weight of the composition.

[0045] It is preferred that the composition for coloring a substrate contains the further solvent in an amount of at most 40 wt.%, further preferably at most 35 wt.%, further preferably at most 30 wt.%, more preferably at most 20 wt.%, most preferably at most 15 wt.%, in each case based on the total weight of the composition. It is preferred that the composition for coloring a substrate contains the further solvent in an amount of 1 to 40 wt.%, further preferably 5 to 20 wt.%, most preferably 10 to 15 wt.%, in each case based on the total weight of the composition.

[0046] It is preferred that the further solvent is a water-soluble organic solvent, further preferably an alcohol, furthermore preferably a polyhydric alcohol, most preferably glycerol or a glycol, e.g. 1,2-propanediol.

[0047] By adding the additional solvent to the composition according to the invention, improved solubility behavior for substances, such as pigments or other colorants, which are poorly soluble in water can be achieved.

[0048] Colorants

[0049] The composition according to the invention for coloring a substrate contains a colorant in an amount of 0.025 to 12.5% ​​by weight, based on the total weight of the composition.

[0050] It is preferred that the colorant is a dye, a pigment or a mixture of two or more thereof.

[0051] As dyes, in particular water-soluble dyes, preferably water-soluble dyes based on food dyes and / or acid dyes and / or basic dyes can be used.

[0052] The following dyes have proven to be particularly suitable:

[0053] Food colorings from the group: E 110, CI 15985, Food Yellow 3; E 104, CI 47005, Food Yellow 13; E 102, CI 19140, Food Yellow 4; E 124, CI 16255, Food Red 7; E 127, CI 45430, Food Red 14; E 133, CI 42090, Food Blue 2; E 131, CI 42051, Food Blue 3 and / or

[0054] Acid dyes from the group: Acid Yellow 23, CI 1910; Acid Red 18, CI 16255; Acid Red 51, CI 45430; Acid Orange 4, CI 16230; Acid Blue 93; Acid Blue 9, CI 42090; Acid Blue 104, CI 42735; Acid Violet 49, CI 42640.

[0055] Basic dyes, preferably dyes from the group of xanthene, coumarin and rhodamine dyes, for example Basic Violet 11, Basic Yellow 40, Basic Blue 3, Basic Blue 7, Basic Red 1, Basic Green 1

[0056] The pigments used can preferably be organic pigments, more preferably phthalocyanine, metal complex, quinacridone, quinophthalone, dioxazine, isoindoline, isoindolinone, benzimidazolone, anthraquinone, arylide, perinone, perylene, naphthol, diketopyrrolopyrrole, or azo pigments, and / or inorganic pigments, such as titanium dioxide, iron oxide, ultramarine, or carbon black. The colorants indicated as preferred can achieve particularly brilliant, intense, and durable coloration. It is preferred that the composition contain the colorant in an amount of at least 0.05% by weight, more preferably at least 0.075% by weight, in each case based on the total weight of the composition.

[0057] It is preferred that the composition contains the colorant (or colorant preparation) in an amount of at most 11.25 wt. %, further preferably at most 10 wt. %, further preferably at most 8.75 wt. %, more preferably at most 7.5 wt. %, most preferably at most 6.25 wt. %, for example at most 5 wt. %, in each case based on the total weight of the composition. It may be provided that the pigments are present and used as a component of a pigment preparation.

[0058] It is preferred that the composition contains the colorant in an amount of 0.025 to 10% by weight, more preferably 0.05 to 7.5% by weight, most preferably 0.075 to 5% by weight, in each case based on the total weight of the composition.

[0059] If the colorant is a dye, it is preferred that the composition contains the colorant in an amount of 0.025 to 3% by weight, more preferably 0.05 to 2% by weight, most preferably about 0.1 to 1% by weight, in each case based on the total weight of the composition.

[0060] If the colorant is a pigment, it is preferred that the composition contains the colorant in an amount of 0.25 to 10 wt.%, more preferably 1.25 to 7.5 wt.%, most preferably 2.5 to 5 wt.%, in each case based on the total weight of the composition.

[0061] For pastel shades, the pigment content can be reduced to 0.025% by weight.

[0062] Optimal coloring can be achieved by using the preferred amounts of colorant.

[0063] binder

[0064] The composition according to the invention for coloring a substrate contains a binder in an amount of 5 to 45 wt.%, based on the total weight of the composition. The binder has an acid number of at least 40 mg KOH / g dry substance. The term "dry substance" refers to the dry substance of the binder, for example, when the binder is used in the form of an aqueous solution or dispersion. The acid number is determined according to DIN ISO EN 2114 in the version valid on the priority date.

[0065] It is preferred that the composition for coloring a substrate contains the binder in a total amount of at least 10 wt.%, particularly preferably at least 15 wt.%, further preferably at least 20 wt.%, furthermore preferably 25 wt.%, most preferably at least 28 wt.%, in each case based on the total weight of the composition. It is preferred that the composition for coloring a substrate contains the binder in a total amount of at most 40 wt.%, particularly preferably at most 35 wt.%, for example about 30 wt.%, in each case based on the total weight of the composition.

[0066] It is preferred that the composition for coloring a substrate contains the binder in a total amount of 10 to 45 wt.%, particularly preferably 20 to 40 wt.%, further preferably 25 to 35 wt.%, most preferably about 28 to 30 wt.%, for example about 36 wt.%, in each case based on the total weight of the composition.

[0067] The binder may preferably have an acid number of at least 50 mg KOH / g dry matter, more preferably at least 60 mg KOH / g dry matter, further preferably at least 70 mg KOH / g dry matter, more preferably at least 80 mg KOH / g dry matter, even more preferably at least 100 mg KOH / g dry matter, most preferably at least 110 mg KOH / g dry matter, for example about 120 mg KOH / g dry matter.

[0068] The binder may preferably have an acid number of at most 250 mg KOH / g dry matter, furthermore preferably of at most 220 mg KOH / g dry matter, furthermore preferably of at most 200 mg KOH / g dry matter, more preferably of at most 180 mg KOH / g dry matter, even more preferably of at most 170 mg KOH / g dry matter, most preferably of at most 160 mg KOH / g dry matter, for example about 130 mg KOH / g or 160 mg KOH / g dry matter.

[0069] The binder may preferably have an acid number of 50 to 250 mg KOH / g dry matter, more preferably 60 to 220 mg KOH / g dry matter, further preferably 70 to 220 mg KOH / g dry matter, more preferably 80 to 180 mg KOH / g dry matter, even more preferably 100 to 170 mg KOH / g dry matter, more preferably 100 to 160 mg KOH / g dry matter, most preferably 110 to 160 mg KOH / g dry matter, such as about 110 to 130 mg KOH / g dry matter, for example about 130 mg KOH / g dry matter or 160 mg KOH / g dry matter.

[0070] The binder can preferably be a polymeric binder. The binder can preferably be a polymer resin. It can be provided that the binder contains carboxyl groups and / or nitrile groups and / or sulfonyl groups, preferably carboxyl groups. This allows particularly good colorability, in particular with basic dyes, to be achieved. It is preferably provided that the binder is a polymer resin comprising carboxyl-containing monomer units. It is particularly preferred that the binder comprises or consists of a polyacrylate resin.

[0071] The binder can be used as a solid and / or as an aqueous binder preparation in the composition, i.e., it can be used in these forms to produce the composition. An aqueous binder preparation in this context is, in particular, a binder solution or a binder dispersion.

[0072] It is preferred that a binder dispersion be used to prepare the composition according to the invention. In such a case, the amount of binder in the composition is specified by reference to the total weight of the binder dispersion (including solvent, etc.).

[0073] It can be provided that the binder dispersion has a pH of at most 7.5, preferably of at most 7, further preferably from 1 to 5, further preferably from 1.5 to 3, most preferably from 1.9 to 2.5. It can be provided that the binder dispersion is a thin, white or translucent binder particle dispersion in acidic or neutral pH ranges (at pH < 7), wherein these binder particles increasingly dissolve at higher pH values ​​until a clear, transparent and highly viscous solution is formed.

[0074] It can be provided that the binder dispersion has a solids content of 30 to 60 wt.%, preferably 40 to 50 wt.%, particularly preferably 43 to 47 wt.%, most preferably 44 to 46 wt.%, in each case based on the total weight of the binder dispersion.

[0075] The binder dispersion may have a viscosity of 10 to 80 mPa-s. Viscosity can be determined according to ASTM-D2196 in the version valid on the priority date.

[0076] It can be provided that the binder dispersion has a density of 1 to 1.2 g / cm3, preferably 1.05 to 1.1 g / cm 3 , for example 1.08 g / cm 3 , has. The density can be determined according to ASTM D1475 in the version valid at the priority date.

[0077] The binder dispersion may have a minimum film-forming temperature of 40 to 70 °C, preferably 50 to 60 °C, particularly preferably 55 to 59 °C, most preferably 56 to 58 °C, for example, approximately 57 °C. The minimum film-forming temperature can be determined according to ASTM D2354-10 in the version valid on the priority date.

[0078] By using an appropriate binder dispersion to produce the composition according to the invention, advantageous mixing with the other components of the composition can be achieved.

[0079] The binder can be an alkali-soluble acrylate dispersion. The binder can be an alkali-soluble polyacrylate dispersion. The binder can be an acidic acrylate dispersion. The binder can be an acidic polyacrylate dispersion. The binder can be an ASE thickener. Commercially available examples of corresponding binders include Joncryl 142, 661, 662, 667 (BASF), Texicryl 13-812, 13-825 (Scott Bader), NeoCryl BT-9, BT-21, BT-24, BT-100, BT-107, BT-207 (DSM), NeoCryl XK-39 (DSM), GLASCOL LE510, LE520, etc. (BASF), or Lucidene 198 (Brenntag). With corresponding alkali-soluble polyacrylate dispersions, the most pronounced effects according to the invention were achieved, namely a particularly well-adjustable water resistance with, at the same time, good resolubility by means of the watercolor composition according to the present invention.It is preferred that the binder has a glass transition temperature of at least 50°C, preferably more than 50°C. The glass transition temperature can be determined by differential scanning calorimetry (DSC) according to ASTM-E1356 in the version valid on the priority date. Such a glass transition temperature leads to increased color stability in the colored substrate.

[0080] It can be provided that the binder, in particular the binder dispersion, comprises binder particles. It can be provided that the binder particles have an average particle diameter of at least 50 nm, preferably of at least 100 nm. The particle diameter can be determined by dynamic light scattering according to ASTM E 3247-20 in the version valid on the priority date. By appropriately large diameters of the binder particles, it can be ensured that the ink does not penetrate too deeply into the absorbent substrate, thereby improving the watercolorability, i.e., the subsequent paintability of the ink on the substrate. pH value

[0081] The composition for coloring a substrate according to the present invention has a pH of at most 7.5, preferably less than 7.5, more preferably at most 7.4, further preferably at most 7.3, further preferably at most 7.2, even more preferably at most 7.1, most preferably at most 7.0, at most 6.9, particularly preferably 6.7, for example at most 6.6, most preferably 6.5.

[0082] It is preferred that the composition for coloring a substrate has a pH of at least 1, more preferably at least 3, further preferably at least 4, furthermore preferably at least 5, more preferably at least 5.5, most preferably at least 6.

[0083] It is preferred that the composition for coloring a substrate has a pH of 4 to 7.5, more preferably 5 to 7.2, further preferably 5.5 to 7, most preferably 6 to 6.5. pH adjuster

[0084] It can be provided that the composition further comprises 0.01 to 3 wt. %, based on the total weight of the composition, of a pH adjuster, in particular a pH adjuster suitable for adjusting the pH of the composition for dyeing a substrate to a pH of at most 7.5, preferably of at most 7. The pH adjuster can be a base or a pH buffer. It is preferred that the pH adjuster is a base. The base used can preferably be an amine, particularly preferably a low-odor amine or an odorless amine, for example N-butylaminoethanol (Vantex®, Eastman), 2-butylaminoethanol (Advantex, Eastman), triethanolamine (CSC Jäklechemie), 2-amino-2-methylpropanol (AMP, Angus Chemie), or tris(hydroxymethyl)aminomethane (Merck).

[0085] It is preferred that the composition contains the pH adjuster in an amount of at least 0.1 wt.%, more preferably at least 0.3 wt.%, further preferably at least 0.5 wt.%, most preferably at least 0.6 wt.%, in each case based on the total weight of the composition.

[0086] It is preferred that the composition contains the pH adjuster in an amount of at most 2.5 wt.%, more preferably at most 2 wt.%, further preferably at most 1 wt.%, most preferably at most 0.75 wt.%, in each case based on the total weight of the composition.

[0087] It is preferred that the composition contains the pH adjuster in an amount of 0.1 to 3 wt.%, particularly preferably 0.3 to 2 wt.%, further preferably 0.5 to 1 wt.%, most preferably 0.6 to 0.75 wt.%, in each case based on the total weight of the composition.

[0088] By using appropriate pH adjusters in the appropriate quantities, the properties of the composition and the film produced with it can be specifically adjusted.

[0089] Preservative / Biocide

[0090] The composition may further comprise 0.01 to 0.5 wt.%, based on the total weight of the composition, of a preservative and / or a biocide. Preferred preservatives are, for example, a mixture of tert-butyl hydroperoxide and monophenyl glycol ether, particularly preferably a mixture of 12 to 60 wt.% tert-butyl hydroperoxide and 3 to 50 wt.% monophenyl glycol ether, or a mixture of i,6-dihydroxy-2,5-dioxahexane and tetramethylolacetylenediurea. Such a preservative is particularly suitable for aqueous solutions and emulsions. A preferred biocide, for example, is a mixture of 2-bromo-2-nitropropane-1,3-diol and 2-octyl-2H-isothiazol-3-one or a mixture of BIT (1,2-benzisothiazolin-3-one), MIT (2-methyl-4-isothiazolin-3-one), and OIT (2-octyl-2H-isothiazol-3-one), which particularly prevents microbial contamination. Another preferred biocide is a mixture of CIT / MIT in a weight ratio of 3:1.Another preferred biocide is 2-bromo-2-nitropropane-1,3-diol. Another preferred biocide is 2-octyl-2H-isothiazol-3-one. Another preferred biocide is phenoxyethanol.

[0091] It is preferred that the composition contains the preservative and / or the biocide in a total amount of at least 0.05 wt.%, particularly preferably at least 0.1 wt.%, further preferably at least 0.15 wt.%, most preferably at least 0.2 wt.%, in each case based on the total weight of the composition.

[0092] It is preferred that the composition contains the preservative and / or the biocide in a total amount of at most 0.4 wt.%, particularly preferably at most 0.3 wt.%, further preferably at most 0.25 wt.%, most preferably at most 0.2 wt.%, in each case based on the total weight of the composition.

[0093] It is preferred that the composition contains the preservative and / or the biocide in a total amount of 0.05 to 0.4 wt.%, particularly preferably 0.1 to 0.3 wt.%, further preferably 0.15 to 0.25 wt.%, most preferably about 0.2 wt.%, in each case based on the total weight of the composition.

[0094] Humectants

[0095] It may be provided that the composition further comprises 0.01 to 20% by weight, based on the total weight of the composition, of a humectant. The humectant is preferably an organic polyol and / or polyglycol and / or sugar and / or a sugar alcohol and / or a corresponding derivative, for example a sugar amine, particularly preferably selected from the group consisting of diethylene glycol, propylene glycol, 1,2-propanediol, glycerin, trimethylolpropane, di-trimethylolpropane, neopentyl glycol, erythritol, pentaerythritol, glucose, fructose, mannose, invert sugar, sucrose, sorbitol, xylitol, mannitol, and mixtures thereof, particularly preferably 1,2-propanediol. It is preferred that the composition contains the humectant in an amount of at least 1% by weight, particularly preferably at least 5% by weight, further preferably at least 7.5% by weight, most preferably at least 10% by weight, in each case based on the total weight of the composition.

[0096] It is preferred that the composition contains the humectant in an amount of at most 17.5 wt.%, particularly preferably at most 15 wt.%, further preferably at most 13.5 wt.%, in each case based on the total weight of the composition.

[0097] It is preferred that the composition contains the humectant in an amount of 1 to 17.5 wt.%, more preferably 5 to 15 wt.%, further preferably 7.5 to 14.5 wt.%, most preferably about 10 to 13.5 wt.%, in each case based on the total weight of the composition.

[0098] Appropriate humectants in appropriate concentrations improve the application properties of the composition. They also prevent the composition from drying out before use.

[0099] The humectant can also act as a film-forming agent and / or as a cap-off additive. A cap-off additive improves the cap-off time. "Cap-off time" is the time a writing instrument or writing system can remain open, i.e., unsealed, stored, or unused without drying out.

[0100] Improved film formation leads to more consistent and homogeneous smears.

[0101] Surfactant / surface-active substance

[0102] The composition may further comprise 0.01 to 7 wt.%, based on the total weight of the composition, of a surfactant and / or surface-active substance. The surfactant may be an emulsifier, a dispersant, a stabilizer, or a substrate wetting agent, preferably a silicone surfactant, a fatty alcohol ether sulfate, a fatty alcohol ether phosphate, a fatty alcohol phosphate ester, a sulfosuccinate, or the like.

[0103] The surfactant is preferably a non-ionic surfactant, an anionic surfactant or an amphoteric surfactant.

[0104] Stabilizers within the meaning of the present disclosure are, in particular, surface-active substances which stabilize the colloidal particle system against reagglomeration or coagulation by adsorption at the particle interfaces by means of steric, electrostatic or electrosteric interactions and thus prevent sedimentation, syneresis, and increases in grain size and viscosity.

[0105] Nonionic surfactants within the meaning of the present disclosure can be classified according to the following system. This is the "HLB system" (Hydrophilic-Lipophilic Balance) developed by Atlas Chemie. In the HLB system, each emulsifier is assigned a numerical value, called the HLB value. The HLB value indicates the hydrophilic-lipophilic balance.

[0106] All emulsifiers contain both hydrophilic and lipophilic groups. A lipophilic emulsifier has a low HLB value of less than 9.0, and a hydrophilic emulsifier has a high HLB value of more than 11.0. Emulsifiers with low HLB values ​​tend to be oil-soluble, while emulsifiers with high HLB values ​​are water-soluble. For example, a water-soluble emulsifier is used when the final product can be diluted with water. O / W emulsifiers have HLB values ​​between 8 and 18. Hydrophilic emulsifiers with a high HLB value favor the formation of an O / W emulsion.

[0107] In the composition according to the invention, commercially available emulsifiers can preferably be used as non-ionic solubilizers. These are available, for example, as viscous solutions and are prepared by reacting ethylene oxide with hydrogenated castor oil and can be composed, for example, of 90% by weight of hydrogenated castor oil, 5% by weight of 1,2-propylene glycol, and 5% by weight of water. Components of such emulsifiers can also be fatty acid glycerol polyethylene glycol esters and fatty acid polyethylene glycol esters. They represent the hydrophobic part of the products. The hydrophilic part can consist of polyethylene glycol and glycerol ethoxylate.

[0108] Possible emulsifiers that can be considered are preferably non-ionic emulsifiers from the following groups: alcohol fatty acid esters, ethylene fatty acid esters, polyethylene glycol fatty acid esters, glycerol or polyfatty acid esters, sorbitol fatty acid esters, pentaerythritol fatty acid esters, fatty acid esters of glycerol esters, sucrose fatty acid esters, alcohol polyglycol ethers, fatty acid polyglycol ethers, fatty acid ester polyglycol ethers, fatty amine polyglycol ethers, polyglycol ethers of fatty acid alkanolamides, polyglycol ethers of fats and oils, polypropylene glycol polyglycol ethers, lanolin polyglycol ethers, alcohol polypropylene glycol ethers, fatty acid polypropylene glycol ethers, polypropylene glycol ethers of fatty amines, lanolin polypropylene glycol ethers. It is preferred that the composition contains the surfactant and / or the surface-active substance in a total amount of at least 0.1% by weight, particularly preferably at least 1% by weight, further preferably at least 1.5% by weight, most preferably at least 2% by weight.- %, each based on the total weight of the composition.

[0109] It is preferred that the composition contains the surfactant and / or the surface-active substance in a total amount of at most 5 wt.%, particularly preferably at most 4 wt.%, further preferably at most 3 wt.%, most preferably at most 2.5 wt.%, in each case based on the total weight of the composition.

[0110] It is preferred that the composition contains the surfactant and / or the surface-active substance in a total amount of 0.1 to 5 wt.%, preferably 1 to 4 wt.%, furthermore particularly preferably 1.5 to 3 wt.%, most preferably 2 to 2.5 wt.%, for example 2.1 wt.%, in each case based on the total weight of the composition.

[0111] By using appropriate surfactants and / or surface-active substances in appropriate amounts, improved ink stability and wettability of the substrate to be colored can be achieved.

[0112] Oligomer / polymer with surface-active / pigment-affine groups

[0113] It may be provided that the composition further comprises a compound with surface-active and / or pigment-affinic groups, preferably an oligomer with surface-active and / or pigment-affinic groups and / or a polymer with surface-active and / or pigment-affinic groups in an amount of 0.01 to 5 wt.%, based on the total weight of the composition.

[0114] Pigment-affine groups within the meaning of the present disclosure are anchor groups which are selected depending on the type of pigment, for example whether it is organic or inorganic.

[0115] Surface-active groups within the meaning of the present disclosure are groups having an affinity to surfaces and interfaces, for example of glass, metal, plastic, air, binder particles (mineral or organic) or pigments (mineral or organic).

[0116] Particularly for use together with inorganic or mineral pigments (Ti02, iron oxide, etc.), compounds with anionic or cationic surface-active and / or pigment-affinic groups can be provided, in particular amino, phosphate, quaternary ammonium, sulfonate, sulfonamide, carboxylate groups, etc.

[0117] Unmodified organic pigments are usually nonpolar and do not carry any surface charges. Nonionic dispersants with hydrophilic and hydrophobic molecular segments are typically used here, with the nonpolar segments attaching to the pigment surface via van der Waals interactions (=> see HLB value). In this case, the corresponding nonpolar segments are considered pigment-affine groups. Examples of hydrophobic surface-active and / or pigment-affine groups include nonylphenol, isotridecyl, isotristyrene, C13 or other branched or linear fatty acid or fatty alcohol groups, siloxane, and novolak groups.

[0118] The addition of such compounds with surface-active and / or pigment-affine groups to the pigmented writing fluid has the effect of stabilizing it against agglomeration, sedimentation, syneresis, viscosity drift, color strength fluctuations, color tone changes and other aging effects, or of improving the compatibility between the binder and the colorant.

[0119] It is preferred that the composition contains the compound with surface-active and / or pigment-affine groups in a total amount of at least 0.1 wt.%, particularly preferably at least 0.5 wt.%, further preferably at least 0.75 wt.%, most preferably at least 1 wt.%, in each case based on the total weight of the composition.

[0120] It is preferred that the composition contains the compound with surface-active and / or pigment-affine groups in a total amount of at most 5 wt.%, particularly preferably at most 2.5 wt.%, further preferably at most 1.5 wt.%, most preferably at most 1 wt.%, in each case based on the total weight of the composition.

[0121] It is preferred that the composition contains the compound with surface-active and / or pigment-affinic groups in a total amount of 0.1 to 5 wt.%, particularly preferably 0.5 to 2.5 wt.%, further preferably 0.75 to 1.5 wt.%, most preferably about 1 wt.%, in each case based on the total weight of the composition.

[0122] Other components

[0123] Furthermore, the addition of co-binders (e.g. acrylate polymers without acid number, etc.) and co-film-forming agents (Texanol, butyldiglycol, etc.) may be provided to further optimize the film properties and other application properties of the ink.

[0124] Likewise, the addition of waxes and other common additives may be intended, among other things, to improve scratch resistance.

[0125] Version sf arms

[0126] In one embodiment, the invention relates to a composition for coloring a substrate, comprising:

[0127] - 20 to 80 wt% water;

[0128] - 0.1 to 0.5% by weight of a biocide;

[0129] - 0.1 to 20% by weight of a humectant;

[0130] - 0.1 to 3% by weight of a pH adjuster; - 0.1 to 7% by weight of a surfactant and / or surface-active substance;

[0131] - 0.1 to 50% by weight of a colorant; and

[0132] - 5 to 45% by weight of a binder; each based on the total weight of the composition; wherein the binder has an acid number of at least 40 mg KOH / g dry substance; and the composition has a pH of at most 7.5.

[0133] In one embodiment, the invention relates to a composition for coloring a substrate, comprising:

[0134] - 25 to 75 wt% water;

[0135] - 0.1 to 0.5% by weight of a biocide;

[0136] - 2 to 18% by weight of a humectant;

[0137] - 0.1 to 4% by weight of a pH adjuster;

[0138] - 0.1 to 7% by weight of a surfactant and / or a surface-active substance;

[0139] - 0.1 to 45% by weight of a colorant;

[0140] - 10 to 40% by weight of a binder; each based on the total weight of the composition; wherein the binder has an acid number of at least 50 mg KOH / g dry substance; and the composition has a pH of at most 7.5.

[0141] Preparation of the composition for coloring a substrate

[0142] The composition for dyeing a substrate can be prepared using mixing methods known from the prior art, for example, in a mixing vessel, into which the components of the composition for dyeing a substrate are added. The components are continuously and intensively mixed with one another using suitable stirring tools to ensure sufficiently uniform distribution. A method for producing a dyed substrate

[0143] The invention further relates to a method for producing a colored substrate.

[0144] Providing the substrate

[0145] In a first process step, a substrate is provided, preferably an absorbent substrate, for example an absorbent writing medium, more preferably drawing board or paper, particularly preferably watercolor paper, or a non-absorbent substrate, for example a plastic substrate, particularly preferably a plastic film, or a mixed media substrate, i.e., a combination of different absorbent and non-absorbent materials or a canvas. Any other suitable substrate, such as wood, stone, eggshells, etc., can also be provided.

[0146] The composition according to the invention can also be used, in particular, on non-absorbent substrates, i.e., it exhibits very good watercolorability even on such substrates. In contrast to prior art compositions, the composition according to the invention exhibits excellent water resistance, regardless of the absorbency of the substrate. In particular, rapid and smear-resistant drying of a smear obtained using the composition according to the invention can be achieved even on non-absorbent substrates.

[0147] Applying and optionally drying the composition for coloring a substrate

[0148] In a subsequent second process step, the composition according to the invention for coloring a substrate is then applied to the substrate.

[0149] The composition is applied to at least one surface of the substrate. The composition is applied to at least a portion of the corresponding surface. The application may comprise writing, drawing, painting, printing, spraying, or a combination of two or more thereof. The application may be carried out using a brush, a pen, in particular a watercolor pencil, a print head, a fountain pen, or any other conventional application device, or a combination of two or more thereof.

[0150] The application may also comprise a further step of applying a further color coating on and / or alongside the first coating, wherein, in particular, it may be provided that this further color coating comprises a colorant that is different from the colorant in the first film. The further color coating may be obtained by a second composition for coloring a substrate according to the present invention, wherein this second composition for coloring a substrate according to the present invention comprises a colorant that is different from the colorant in the first film. The first color coating and the optional further color coating are transferred into the first film as follows. After application, the applied composition may optionally be dried on the substrate (or partially within it, if part of the composition has penetrated into the absorbent substrate).Drying can be carried out at room temperature (23°C) under normal atmospheric pressure. Drying can be assisted by applying heat, passing a gas stream (air stream) past the composition to be dried, applying a vacuum, etc.

[0151] After drying, a first film is obtained on the substrate (or, if necessary, partially in the absorbent substrate, provided that part of the composition has penetrated the absorbent substrate). This first film is largely water-resistant, preferably waterproof, and can be painted over with other colors without smearing, i.e., without mixing with the other colors (other compositions for coloring a, preferably, substrate).

[0152] Alternatively, the first film can be obtained from the applied composition for coloring a substrate according to the invention without a drying step, which is then watercolored as described below. The method further comprises a step of providing a watercolor composition comprising 40 to 99.5 wt.% water and 0.5 to 10 wt.% base, each based on the total weight of the watercolor composition.

[0153] The watercolor composition can be provided by a manufacturer of the composition for coloring a substrate according to the invention and marketed together with the composition for coloring a substrate, for example in the form of a kit in which the composition for coloring a substrate and the watercolor composition are presented separately, for example in separate bottles or filled into an applicator. In such a case, amine-based bases are preferred in the watercolor composition. Alternatively, the manufacturer of the composition for coloring a substrate according to the invention can market only this composition, together with instructions for preparing a watercolor composition by the end user using commercially available means. In such a case, sodium bicarbonate or sodium carbonate, for example, are preferred bases.

[0154] Water

[0155] It is preferable to use deionized or demineralized water. This makes it possible to avoid unwanted impurities that could affect the stability and durability (hardening agents) of the watercolor composition.

[0156] It can be provided that the watercolor composition contains water as the predominant solvent, preferably in an amount of at least 90% by volume, based on the total amount of solvent in the watercolor composition. It is particularly preferred that the watercolor composition contains water as the exclusive solvent. It is preferred that the watercolor composition contains water in an amount of at least 50% by weight, particularly preferably at least 70% by weight, further preferably at least 80% by weight, furthermore preferably at least 90% by weight, most preferably at least 95% by weight, in each case based on the total weight of the

[0157] Watercolor composition, contains.

[0158] It is preferred that the watercolor composition contains water in an amount of at most 99% by weight based on the total weight of the watercolor composition.

[0159] It is preferred that the watercolor composition contains water in an amount of 50 to 99.5 wt.%, more preferably 90 to 99.5 wt.%, most preferably 95 to 99 wt.%, each based on the total weight of the watercolor composition. With the stated preferred amounts of water in the watercolor composition, optimized redissolution of the first film can be achieved.

[0160] base

[0161] The base can preferably be an amine, a low-odor amine, or an odorless amine, for example, N-butylaminoethanol (VantexT, Eastman), 2-butylaminoethanol (Advantex, Eastman), triethanolamine (CSC Jäklechemie), 2-amino-2-methylpropanol (AMP, Angus Chemie), or tris(hydroxymethyl)aminomethane (Merck). Sodium bicarbonate (baking powder, baking soda), sodium carbonate (soda), or ammonium bicarbonate (ammonium bicarbonate) can also be used as a base.

[0162] It is preferred that the watercolor composition contains the base in an amount of at least 0.1% by weight, particularly preferably at least 1% by weight, further preferably at least 2% by weight, most preferably at least 3% by weight, in each case based on the total weight of the watercolor composition.

[0163] It is preferred that the watercolor composition contains the base in an amount of at most 6% by weight, particularly preferably at most 5% by weight, further preferably at most 4% by weight, most preferably at most 3% by weight, in each case based on the total weight of the watercolor composition.

[0164] It is preferred that the watercolor composition contains the base in an amount of 0.1 to 6 wt.%, particularly preferably 1 to 5 wt.%, further preferably 2 to 4 wt.%, most preferably about 3 wt.%, in each case based on the total weight of the watercolor composition.

[0165] Preservative / Biocide

[0166] The watercolor composition may further comprise 0.01 to 0.5 wt.%, based on the total weight of the watercolor composition, of a preservative and / or a biocide. Preferred preservatives are, for example, a mixture of tert-butyl hydroperoxide and monophenyl glycol ether, particularly preferably a mixture of 12 to 60 wt.% tert-butyl hydroperoxide and 3 to 50 wt.% monophenyl glycol ether, or a mixture of 1,6-dihydroxy-2,5-dioxahexane and tetramethylolacetylenediurea. Such a preservative is particularly suitable for aqueous solutions and emulsions. A preferred biocide is, for example, a mixture of 2-bromo-2-nitropropane-i,3-diol and 2-octyl-2H-isothiazol-3-one or a mixture of BIT (i,2-benzisothiazolin-3-one), MIT (2-methyl-4-isothiazolin-3-one) and OIT (2-octyl-2H-isothiazol-3-one), which in particular prevents contamination.Another preferred biocide is a mixture of CIT / MIT in a weight ratio of 3:1. Another preferred biocide is 2-bromo-2-nitropropane-1,3-diol. Another preferred biocide is 2-octyl-2H-isothiazol-3-. Another preferred biocide is phenoxyethanol.

[0167] It is preferred that the watercolor composition contains the preservative and / or the biocide in a total amount of at least 0.05 wt.%, particularly preferably at least 0.1 wt.%, further preferably at least 0.15 wt.%, most preferably at least 0.2 wt.%, in each case based on the total weight of the

[0168] Watercolor composition, contains.

[0169] It is preferred that the watercolor composition contains the preservative and / or the biocide in a total amount of at most 0.4 wt.%, particularly preferably at most 0.3 wt.%, further preferably at most 0.25 wt.%, most preferably at most 0.2 wt.%, in each case based on the total weight of the watercolor composition.

[0170] It is preferred that the watercolor composition contains the preservative and / or the biocide in a total amount of 0.05 to 0.4 wt.%, particularly preferably 0.1 to 0.3 wt.%, further preferably 0.15 to 0.25 wt.%, most preferably about 0.2 wt.%, in each case based on the total weight of the watercolor composition.

[0171] binder

[0172] It may be provided that the watercolor composition further comprises 0.1 to 50 wt.% of a binder.

[0173] It is preferred that the binder is an alkali-stable binder. The binder may be gum arabic, a wax, for example beeswax, or a synthetic polymeric binder, preferably a polyacrylate, a polyurethane, a polyester, a sulfopolyester, a maleate resin, or a copolymer of two or more thereof, a polyvinyl alcohol, polyvinylpyrrolidone, etc. For example, the binder may be Acronal 12DE (dispersion of an acrylonitrile-acrylic acid ester copolymer, BASF), Neocryl XK166N (dispersion of an acrylostyrene copolymer, Covestro), NeoRez R-3972 (polyurethane dispersion, Covestro), Eastek 1000 (colloidal solution of a sulfopolyester, Eastman), or

[0174] Mowiol 4-88 (polyvinyl alcohol solid resin, Kuraray).

[0175] It is preferred that the watercolor composition contains the binder in a total amount of at least 1% by weight, particularly preferably at least 5% by weight, further preferably at least 10% by weight, most preferably at least 20% by weight, in each case based on the total weight of the watercolor composition.

[0176] It is preferred that the watercolor composition contains the binder in a total amount of at most 45% by weight, more preferably at most 40% by weight, particularly preferably at most 30% by weight, for example about 28% by weight, in each case based on the total weight of the watercolor composition.

[0177] It is preferred that the watercolor composition contains the binder in a total amount of 1 to 45 wt.%, particularly preferably 5 to 40 wt.%, further preferably 10 to 35 wt.%, most preferably about 20 to 30 wt.%, for example about 28 wt.%, in each case based on the total weight of the watercolor composition.

[0178] Surfactant / surface-active substance

[0179] It may be provided that the watercolor composition further comprises 0.01 to 7% by weight, based on the total weight of the watercolor composition, of a surfactant and / or a surface-active substance.

[0180] The surfactant may be an emulsifier, a dispersant, a stabilizer or a substrate wetting agent, preferably a silicone surfactant, a fatty alcohol ether sulfate, a fatty alcohol ether phosphate, a fatty alcohol phosphate ester, a sulfosuccinate, a sugar surfactant or the like.

[0181] The surfactant is preferably a non-ionic surfactant, an anionic surfactant or an amphoteric surfactant.

[0182] Stabilizers within the meaning of the present disclosure are, in particular, surface-active substances which stabilize the colloidal particle system against reagglomeration or coagulation by adsorption at the particle interfaces by means of steric, electrostatic or electrosteric interactions and thus prevent sedimentation, syneresis, and increases in grain size and viscosity.

[0183] Nonionic surfactants within the meaning of the present disclosure can be classified according to the following system. This is the "HLB system" (Hydrophilic-Lipophilic Balance) developed by Atlas Chemie. In the HLB system, each emulsifier is assigned a numerical value, called the HLB value. The HLB value indicates the hydrophilic-lipophilic balance.

[0184] All emulsifiers contain both hydrophilic and lipophilic groups. A lipophilic emulsifier has a low HLB value of less than 9.0, and a hydrophilic emulsifier has a high HLB value of more than 11.0. Emulsifiers with low HLB values ​​tend to be oil-soluble, while emulsifiers with high HLB values ​​are water-soluble. For example, a water-soluble emulsifier is used when the final product can be diluted with water. O / W emulsifiers have HLB values ​​between 8 and 18. Hydrophilic emulsifiers with a high HLB value favor the formation of an O / W emulsion. In the watercolor composition according to the invention, commercially available emulsifiers can preferably be used as non-ionic solubilizers, which are available, for example, as viscous solutions and which have been prepared by reacting ethylene oxide with hydrogenated castor oil and can be composed, for example, of 90% by weight of hydrogenated castor oil, 5% by weight of 1,2-propylene glycol and 5% by weight of water.Components of such emulsifiers can also include fatty acid glycerol polyethylene glycol esters and fatty acid polyethylene glycol esters. These represent the hydrophobic part of the products. The hydrophilic part can consist of polyethylene glycol and glycerol ethoxylate.

[0185] Possible emulsifiers that can be considered are preferably non-ionic emulsifiers from the following groups: alcohol fatty acid esters, ethylene fatty acid esters, polyethylene glycol fatty acid esters, glycerol or polyfatty acid esters, sorbitol fatty acid esters, pentaerythritol fatty acid esters, fatty acid esters of glycerol esters, sucrose fatty acid esters, alcohol polyglycol ethers, fatty acid polyglycol ethers, fatty acid ester polyglycol ethers, fatty amine polyglycol ethers, polyglycol ethers of fatty acid alkanolamides, polyglycol ethers of fats and oils, polypropylene glycol polyglycol ethers, lanolin polyglycol ethers, alcohol polypropylene glycol ethers, fatty acid polypropylene glycol ethers, polypropylene glycol ethers of fatty amines, lanolin polyglycol ethers.

[0186] It is preferred that the watercolor composition contains the surfactant and / or the surface-active substance in a total amount of at least 0.1% by weight, particularly preferably at least 1% by weight, further preferably at least 1.5% by weight, most preferably at least 2% by weight, in each case based on the total weight of the watercolor composition.

[0187] It is preferred that the watercolor composition contains the surfactant and / or the surface-active substance in a total amount of at most 5% by weight, particularly preferably at most 4% by weight, further preferably at most 3% by weight, most preferably at most 2.5% by weight, in each case based on the total weight of the

[0188] Watercolor composition, contains.

[0189] It is preferred that the watercolor composition contains the surfactant and / or the surface-active substance in a total amount of 0.1 to 5 wt.%, preferably 1 to 4 wt.%, furthermore particularly preferably 1.5 to 3 wt.%, most preferably 2 to 2.5 wt.%, for example 2.1 wt.%, in each case based on the total weight of the watercolor composition.

[0190] By using appropriate surfactants and / or surface-active substances in appropriate quantities, improved ink stability and wettability of the substrate to be watercolored can be achieved.

[0191] Applying and watercoloring

[0192] The provided watercolor composition is applied to at least a portion of the first film. Application can be effected using a brush, a pen, in particular a watercolor pencil, a print head, a fountain pen, or other conventional application device, or a combination of two or more thereof. By applying the watercolor composition to the first film, the first film is at least partially "dissolved," i.e., at least a portion of the solid from the composition for coloring a substrate, which is contained in the first film upon drying, in particular corresponding portions of the colorant and the binder with an acid number of at least 40 mg KOH / g, is dissolved in the watercolor composition.Due to the acid number of at least 40 mg KOH / g of the binder contained in the composition for dyeing a substrate, the solid components of the composition deposited together with this binder are far more soluble or redispersible in basic (pH > 7) than in neutral or acidic (pH < 7) media. The base contained in the watercolor composition therefore supports the "dissolving" process. The existing carboxyl groups of the acidic polymer are completely neutralized by the base of the watercolor composition, thereby achieving or significantly increasing the polymer's water solubility.

[0193] Watercolor painting is understood here as the mixing of different layers of paint (of the same or different colors) applied next to or on top of each other in order to achieve smooth transitions between the layers of paint.

[0194] The steps (1) of applying the watercolor composition to at least a portion of the first film to obtain an at least partially dissolved first film; and (2) of watercoloring the at least partially dissolved first film to obtain a watercolored film can at least partially overlap, i.e., occur at least partially simultaneously. This means, in particular, that the thus partially dissolved film can be watercolored even during the application of the watercolor composition.

[0195] Dry

[0196] After the watercolor application, the watercolored film is dried on the substrate (or partially within it, if some of the composition has penetrated the substrate). Drying can take place at room temperature (23°C) under normal atmospheric pressure. Drying can be assisted by applying heat, passing a gas stream (air stream) over the composition to be dried, applying a vacuum, etc.

[0197] If an amine compound, in particular a highly volatile amine compound, is used as a base in the watercolor composition, the drying step leads to a reprotonation of the binder with an acid number of at least 40 mg KOH / g dry substance, since the amine compound is released again in the drying step from the ammonium compound, which is obtained by reaction of the amine compound with a proton of the binder with an acid number of at least 40 mg KOH / g dry substance during the application of the watercolor composition to at least part of the first film, and evaporates or volatilizes.

[0198] If a different base is used in the watercolor composition, such as a semi-volatile or non-volatile base such as an alkali hydroxide, an additional fixing step may be required after drying. This step could involve applying an acidic aqueous solution, for example, using a "fixing spray," to the watercolored film.

[0199] Alternatively, a varnishing process can be carried out using an appropriate aqueous solution of polyvalent metal salts (salts of zinc, aluminum, iron, magnesium, calcium, etc.), which form poorly soluble compounds with the acidic binder of the watercolor composition.

[0200] The second film thus obtained, which can in particular have smooth color transitions, can again be waterproof.

[0201] Use of the composition for coloring a substrate

[0202] The invention further relates to the use of the composition for coloring a substrate according to the present invention for producing a completely or partially alkali-soluble film on a substrate.

[0203] The use according to the invention can in particular comprise the provision of a substrate, preferably an absorbent substrate, for example an absorbent writing support, more preferably drawing board or paper, particularly preferably watercolor paper, or a non-absorbent substrate, for example a plastic substrate, particularly preferably a plastic film, or a mixed media substrate, i.e., a combination of different absorbent and non-absorbent materials or a canvas. Any other suitable substrate, such as wood, stone, eggshells, etc., can also be provided.

[0204] It can be provided that the composition according to the invention for coloring a substrate is then applied to the substrate.

[0205] The composition is applied to at least part of the corresponding surface. The application may involve writing, drawing, painting, printing, spraying, or a combination of two or more thereof. The application may be carried out using a brush, a pen, in particular a watercolor pencil, a print head, a fountain pen, or another conventional application device (e.g., an airbrush), or a combination of two or more thereof.

[0206] The application may also comprise a further step of applying a further color coating on and / or alongside the first coating, wherein, in particular, it may be provided that this further color coating comprises a colorant that is different from the colorant in the first film. The further color coating may also be obtained by a composition for coloring a substrate according to the present invention, wherein this further color coating comprises a colorant that is different from the colorant in the first film. The first color coating and the optional further color coating are transferred into the first film as follows.

[0207] After application, the applied composition can be dried on the substrate (or partially within it, if part of the composition has penetrated the substrate). Drying can take place at room temperature (23°C) under normal atmospheric pressure. Drying can be assisted by applying heat, passing a gas stream (air stream) over the composition to be dried, applying a vacuum, etc.

[0208] Effect of the invention

[0209] The composition according to the invention for coloring a substrate is surprisingly adjustable in water resistance and watercolorability, ie it has both the advantages of water-resistant, binder-containing inks and the advantages of easily watercolorable inks while avoiding their disadvantages.

[0210] With the help of the composition according to the invention and its use, particularly in the process according to the invention, the two different ink types can be combined without diminishing the advantages of both groups. It is possible to produce a single product range, leaving it up to the end customer to decide for which painting technique or application they ultimately want to use the product. Furthermore, even after completing their work of art, the user can still decide whether they want to subsequently process it using watercolor techniques.

[0211] Another advantage is that such a watercolor remains water-resistant.

[0212] Another advantage is that multiple layers of color can be applied on top of each other without smearing the underlying layers. This allows, for example, outlines to be drawn with a dark color, which can then be colored with light colors without blurring the contours (e.g., a combination of yellow and black). This is not possible with state-of-the-art compositions. Another advantage is that when painting over dried layers of color, the tip of the writing instrument no longer becomes dirty and therefore does not require laborious cleaning.

[0213] General definitions

[0214] Unless expressly stated otherwise, a feature stated in the singular (a, an...) also includes the plural. For example, if it is stated that the composition according to the invention contains a dye, this also includes the case where the composition contains a mixture of several dyes.

[0215] Unless expressly stated otherwise, terms such as “comprising”, “containing”, etc. include the meanings “essentially comprising”, “essentially containing” or “consisting of”.

[0216] The amounts specified for the composition according to the invention for coloring a substrate add up to a total of 100 wt.% and thus constitute the total amount of the composition. Unless expressly stated otherwise, the term "composition" as used herein refers to the "composition according to the invention for coloring a substrate."

[0217] Examples of implementation

[0218] Recipe example 1 (black ink):

[0219] 35.0 g water

[0220] 0.2 g mixture of 2.5 wt% BIT / 4 wt% MIT / 1 wt% OIT (biocide)

[0221] 10.0 g 1,2-propanediol

[0222] 4.0 g sorbitol

[0223] 0.60 g triethanolamine

[0224] 1.0 g Ci2-Ci5 alcohol ethoxylate phosphoric acid ester, DMEA neutralized (compound with surface-active and / or pigment-affinic groups)

[0225] 0.60 g BYK-348 from BYK-Chemie (silicone surfactant)

[0226] 20.0 g carbon black pigment

[0227] 28.6 Neocryl XK-39 from Covestro (alkali-soluble polyacrylate dispersion => acid number (AN) = 130 mg KOH / g dry substance) pH value of the total composition = 6.6

[0228] Recipe example 2 (magenta ink):

[0229] 52.15 g water

[0230] 0.2 g mixture of 2.5 wt% BIT / 4 wt% MIT / 1 wt% OIT (biocide)

[0231] 12.0 g 1,2-propanediol

[0232] 3.0 g xylitol

[0233] 0.75 g triethanolamine

[0234] 1.0 g Disponil FES 77 from Cognis (Ci2-Ci4 fatty alcohol ether sulfate sodium salt (30 EO) (compound with surface-active and / or pigment-affinic groups) 0.60 g Tego Wet KL 245, Evonic (silicone surfactant)

[0235] 0.30 g dye “Basic Violet 11:1”

[0236] 30.0 g Joncryl 661, BASF (alkali-soluble polyacrylate dispersion with SZ = 154 mg KOH / g dry substance) pH of the total composition = 6.5

[0237] Watercolor composition

[0238] 60.0% water

[0239] 0.1% mixture of 2.5 wt% BIT / 4 wt% MIT / 1 wt% OIT (biocide)

[0240] 7.5% glycerin

[0241] 28% Acronal 12DE (binder)

[0242] 3.0% Advantex (base)

[0243] 1.4% Disponil OC 25 (oleyl cetyl ethoxylate (C16 / C18) (25 EO)) (surfactant)

[0244] Experimental examples and implementation

[0245] Substrate: Paper, Hahnemühle, watercolor paper 450g / m 2 , Ref. No.: 10628410

[0246] Applicator: Pentel. “Aqua Brush Water Tank Brush Broad”

[0247] Contact weight: 70g

[0248] Colorimeter: PANTONE CAPSURE

[0249] Procedure: First, six 1 mm wide lines of the watercolorable ink were drawn on the substrate according to Recipe Example 1 above, spaced 3 mm apart (base smear). These smears were dried for 1 hour under standard conditions (defined according to DIN EN ISO 139 => 23°C, 50% relative humidity).

[0250] This base coat was then painted over twice in quick succession using the applicator described above, either with water or with the watercolor composition specified above. Experimental Example i:

[0251] Applicator filled with water

[0252] Experimental example 2:

[0253] Applicator filled with the watercolor composition according to the invention.

[0254] Evaluation:

[0255] Determination of the color strength of the unpainted space between the colored lines with an assumed color strength of 0%. In comparison, the assumed color strength of the colored lines is 100%.

[0256] Table i: Presentation of the test results

[0257] As shown in Table i, the color intensity of the spaces after treatment with tap water is unchanged at 0%.

[0258] The color strength of the spaces after treatment with the watercolor composition is about 40%.

[0259] The features of the invention disclosed in the above description and in the claims may be essential both individually and in any combination for the realization of the invention in its various embodiments.

Claims

Patent claims 1. A composition for coloring a substrate, comprising: - 20 to 80 wt% water; - 0.025 to 12.5% ​​by weight of a colorant; and - 5 to 45% by weight of a binder; each based on the total weight of the composition; wherein the binder has an acid number of at least 40 mg KOH / g dry substance; and the composition has a pH of at most 7.

5.

2. A composition for coloring a substrate according to claim 1, wherein the coloring is writing, drawing, painting, printing, spraying, or a combination of two or more thereof.

3. Composition for coloring a substrate according to claim 1 or 2, wherein the substrate is an absorbent writing support, preferably drawing board or paper, or a non-absorbent substrate, preferably a plastic film or a plastic film, a mixed media substrate or a canvas.

4. A composition for coloring a substrate according to any one of the preceding claims, wherein the colorant is a dye, a pigment or a mixture of two or more thereof.

5. A composition for coloring a substrate according to any one of the preceding claims, wherein the binder has an acid number of at least 80 mg KOH / g dry substance.

6. A composition for coloring a substrate according to any one of the preceding claims, wherein the binder comprises binder particles, the binder particles preferably having an average particle diameter of at least 50 nm, more preferably at least 100 nm.

7. A composition for coloring a substrate according to any one of the preceding claims, wherein the binder comprises a polyacrylate resin, preferably polyacrylate resin particles.

8. A composition for coloring a substrate according to any one of the preceding claims, wherein the composition has a pH in a range of 5.5 to 7.

0.

9. A composition for coloring a substrate according to any one of the preceding claims, wherein the composition further comprises 0.01 to 3% by weight, based on the total weight of the composition, of a pH adjuster.

10. A composition for coloring a substrate according to claim 9, wherein the pH adjusting agent is a base.

11. A composition for coloring a substrate according to any one of the preceding claims, wherein the composition further comprises 0.01 to 0.5% by weight, based on the total weight of the composition, of a preservative and / or a biocide.

12. A composition for coloring a substrate according to any one of the preceding claims, wherein the composition further comprises 0.01 to 20% by weight, based on the total weight of the composition, of a humectant.

13. A composition for coloring a substrate according to any one of the preceding claims, wherein the composition further comprises 0.01 to 7% by weight, based on the total weight of the composition, of a surfactant.

14. A method for producing a colored substrate, comprising: - Providing a substrate; - applying the composition for coloring a substrate according to any one of claims 1 to 13 to at least a part of at least one surface of the substrate and optionally drying the composition to obtain a first film; - Providing a watercolor composition comprising: - 40 to 99.5 wt% water; and - 0.5 to 10% by weight of base, based on the total weight of the watercolor composition; - applying the watercolor composition to at least part of the first film to obtain an at least partially dissolved first film; - watercolouring the at least partially dissolved first film to obtain a watercoloured film; and - Drying the watercolored film to obtain a second film.

15. Use of the composition for coloring a substrate according to any one of claims 1 to 13 for producing a completely or partially alkali-soluble film on a substrate.

Images