Paste compositions (III)

Abstract

Paste compositions with a water content of no more than 2% by weight, containing and / or consisting of (a) at least one colour pigment and / or one filler, (b) at least one poloxamer and, if appropriate, (c) at least one dispersant.

Description

AREA OF INVENTION

[0001] The invention is in the field of paints and coatings and essentially relates to water- and solvent-free pigment paste formulations containing color pigments together with novel viscosity regulators. TECHNOLOGICAL BACKGROUND

[0002] Both professional painters and decorators, as well as DIY enthusiasts, enjoy the time-saving and highly precise method of achieving a desired color by mixing pigment pastes with base paints and varnishes. Hardware stores, in particular, utilize dispensing machines that contain a large number of color pastes. These machines allow users to quickly and consistently produce the desired color based on a formula database by selecting the appropriate pigment paste type and quantity, along with the corresponding base paints and varnishes.

[0003] With these so-called color mixing systems, two parameters are critical: firstly, the accuracy of color production depends on the number of pigment pastes available with different pigment types (color indices) and concentrations. The more different color pastes are available, the larger the achievable color gamut, but the more space is required on the system. Secondly, the pigment pastes are not all needed with the same frequency or in the same quantities, which means that some colors can remain in their containers for months, promoting bacterial growth and drying out of conventional pigment pastes.

[0004] To keep the amount of paste on the mixing machines low, highly concentrated pigment pastes are used, which contain as little water or solvent as possible and therefore require less storage space. However, as the amount of solvent decreases, the viscosity increases, which makes dosing more difficult or sometimes impossible.

[0005] While the problem of microbial contamination can be solved by eliminating water as a solvent, this necessitates either switching to solvent-based systems – which again requires more space and is undesirable from an ecotoxicological perspective – or adding biocides to the pigment pastes. However, biocide-containing systems are increasingly viewed critically by consumers and, in particular, cannot be awarded the "Blue Angel" ecolabel.

[0006] In aqueous systems, the drying out of pigment pastes is countered by the use of humectants, while in solvent-based pastes, solvents with a lower evaporation rate are used. RELEVANT STATE OF THE TECHNOLOGY

[0007] Monoepoxide monoamine adducts are known from WO 2018 184961 A1 (BYK) as dispersants and wetting agents for colour pigments.

[0008] Polyurethane-based copolymers are proposed in WO 2015 090811 A1 (BASF) for the same purpose.

[0009] The subject of WO 2018 157965 A1 (THOR) is the use of 5-chloro-2-methylisothiazolin as a biocide for the preservation of technical products including pigment pastes. TASK OF INVENTION

[0010] The object of the present invention was therefore to provide pigment pastes, preferably both water-free and solvent-free (so-called "100%") systems, which, despite the absence of solvents, exhibit a sufficiently low viscosity so that they are easily flowable and pumpable. Furthermore, the preparations should contain only essential components that meet the requirements of the RAL UZ 102 "Blue Angel" ecolabel for tinting products. These include, for example, the absence of biocides, plasticizers, substances of very high concern (SVHCs), and water-polluting substances. DESCRIPTION OF THE INVENTION

[0011] The invention relates to paste compositions containing and / or consisting of (a) at least one colour pigment and / or one filler, (b) at least one poloxamer, and where appropriate (c) at least one dispersant.

[0012] Surprisingly, it was found that poloxamers allow the production of free-flowing and pumpable pigment and filler pastes with a solids content of up to 80% by weight. Free-flowing and pumpable in this context means that the pastes have a viscosity (plate / plate, 20°C) of less than 1,000 mPas at a shear rate of 500 s and less than 20,000 mPas at 1 s. The pastes are considered anhydrous, containing at most up to 2% by weight of water, which is introduced via the pigments or, if applicable, the residual moisture of the alkoxylates and / or dispersants. They are also free of solvents and plasticizers. Since they meet the requirements of RAL UZ 102 for constitutional components of tinting products, the pigment preparations are highly suitable for tinting base paints and varnishes bearing the "Blue Angel" ecolabel. Paste compositions

[0013] The pastes may contain pigments, especially color pigments, or fillers, which can be of inorganic or organic origin; their selection is largely uncritical and depends solely on the intended use. They can be intended for later use in paints as well as varnishes. Examples of organic pigments are arylide yellow (CI 11741), phthalocyanine green (CI 74260), phthalocyanine blue (CI 74160), diketopyrrolopyrrole (CI 56110), and carbazole violet (CI 51319). The preferred inorganic pigments are titanium dioxide (CI 77891), iron oxide red (CI 77491), iron oxide yellow (CI 77492), and bismuth vanadate (CI 771740). In addition, carbon black (CI 77266) or other colored mixed metal oxides—provided they are toxicologically safe—may also be used. Examples of fillers used to adjust application-related properties such as density and viscosity include calcium carbonate (CI77220), barium sulfate (CI77120), and talc (CI77120).77718) or also Kaolin (CI77004) is used. Poloxamere

[0014] Poloxamers are block copolymers of ethylene oxide and propylene oxide, which schematically follow formula (III) in which a and b represent numbers from about 100 to about 500.

[0015] These polymers are low-foaming and foam-reducing nonionic surfactants used for dispersion and emulsification in the chemical and technical industries. The polyethylene oxide portion of the polymer is water-soluble, while the polypropylene oxide portion is not, resulting in amphiphilic properties. Depending on the degree of ethoxylation, poloxamers are liquid (L), pasty (P), solid (F), or powder. Poloxamers typically contain a central polypropylene glycol moiety and are characterized by a two- or three-digit number. These polymers were developed by BASF in the 1950s and have since been marketed under the brand name Pluronic.® distributed. The last digit, multiplied by a factor of 10, gives approximately the relative mass fraction of the ethylene oxide units in percent; the preceding digit(s), multiplied by a factor of 100, encodes the relative molecular mass of the polypropylene glycol block. Examples of particularly suitable poloxamers are: • Pluronic PE6400, • Pluronic 8100, • Pluronic RPE1740 and • Pluronic 3110.

[0016] Preferably, the poloxamers have molecular weights in the range of about 5,000 to about 20,000 and preferably about 7,500 to about 15,000. Amine compounds as dispersants

[0017] Although the addition of alkoxylated carboxylic acids alone reduces the viscosity of even highly concentrated pigment pastes so significantly that they become flowable and pumpable even in the absence of water or organic solvents, this effect can be further enhanced by using specific amine compounds as dispersants. The ratio of additive to co-additive can range from 50:50 to 95:5, and preferably from 80:20 to 90:10.

[0018] The amine compounds can be aliphatic, aromatic, or araliphatic in nature. The nitrogen can also be part of a ring. The compounds can be primary, secondary, or tertiary amines and have 1 to 20 carbon atoms per substituent on the nitrogen.

[0019] Suitable amine compounds follow in a first embodiment of formula (IV) in the R 3 for -(CHY) x (NH) y (CHY)z A, x and y each for integers from 1 to 10, preferably 1 to 5, y for 0 or 1, Y represents hydrogen or an alkyl group with 1 to 4 carbon atoms, A for hydrogen, a hydroxyl group, an amino group or an (OCH2CHY)p group P for integers from 1 to 10 and R 4 and R 5 independently of each other for hydrogen or R 1 stand.

[0020] Suitable examples are in particular the addition products of 1 to 25, preferably 2 to 5 mol of ethylene oxide and / or propylene oxide (in random or block distribution) to methylamine, dimethylamine, ethylamine, diethylamine, propylamine, dipropylamine, butylamine, dibutylamine, methylethylamine, diethyleneamine, dipropylenamine, ethanolamine, diethanolamine, triethanolamine and mixtures thereof. Pigment pastes

[0021] In a first preferred embodiment, paste compositions are preferred which (a) about 5 to about 80 wt.%, preferably about 10 to about 75 wt.% and in particular about 25 to about 60 wt.% color pigments and / or fillers and (b) about 20 to about 95 wt.%, preferably about 25 to about 90 wt.% and in particular about 40 to about 75 wt.% poloxamers with the stipulation that the quantities may be supplemented with further additives to reach 100% by weight.

[0022] A second embodiment prefers paste compositions which (a) about 5 to about 80 wt.%, preferably about 10 to about 75 wt.% and in particular about 25 to about 60 wt.% colour pigments and / or fillers; (b) about 20 to about 90 wt.%, preferably about 25 to 80 wt.% and in particular about 40 to 75 wt.% poloxamers as well as (c) containing about 1 to about 7 wt.%, preferably about 2 to about 5 wt.% dispersants, with the provision that the amounts may be supplemented with further additives to 100 wt.%.

[0023] To avoid any ambiguity, it should be noted that preparations derived from the specified quantity ranges, but which do not supplement each other to 100% by weight or exceed 100% by weight, are not covered by the invention. Within the specified ranges, a person skilled in the art can find suitable compositions that supplement each other to 10% by weight and fulfill the technical teaching without having to make an inventive step.

[0024] Preferably, the paste compositions according to the invention are anhydrous; however, they may have a total water content of a maximum of 2 wt.% and preferably a maximum of 1 wt.% if the color pigments and fillers used, as well as the alkoxylates and dispersants, have a residual water content.

[0025] The paste compositions according to the invention meet the requirements of RAL ZU 102 “Blue Angel” for tinting products. These include, for example, the absence of biocides, plasticizers, SVHCs and water-polluting substances. They also meet the requirements for classification in water hazard class (WGK) 1.

[0026] The paste compositions are further characterized by having a viscosity (plate / plate, 20 °C) of less than 1,000 mPas at a shear rate of 500 1 / s and less than 20,000 mPas at 1 1 / s. COMMERCIAL APPLICABILITY

[0027] Furthermore, a method for producing water- and solvent-free paste compositions is disclosed, comprising or consisting of the following steps: (a) Providing at least one inorganic or organic pigment or filler; (b) Provide at least one poloxamer; (c) where appropriate, providing at least one disperser; and (d) Homogenizing and dispersing components (a), (b) and, if applicable, (c).

[0028] The use of poloxamers, optionally in combination with dispersants, as additives for the production of water- and solvent-free pigment pastes is also disclosed. The poloxamers preferably have molecular weights of approximately 5,000 to approximately 20,000 Daltons. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] WO 2018 184961 A1

[0007] WO 2015 090811 A1

[0008] WO 2018 157965 A1

[0009]

Claims

[1] Paste compositions with a water content of not more than 2% by weight, containing and / or consisting of (a) at least one colour pigment and / or one filler, (b) at least one poloxamer and, if appropriate, (c) at least one dispersant. [2] Paste compositions according to claim 1, characterized by that they contain inorganic and / or organic color pigments and / or fillers. [3] Paste compositions according to claims 1 and / or 2, characterized by , that the poloxamers have molecular weights of approximately 5,000 to approximately 20,000 Daltons. [4] Paste compositions according to at least one of claims 1 to 3, characterized by , that they act as dispersants amine compounds of formula (IV) R 3 -N(R 4 )R 5 (IV) contained in the R 3 for -(CHY) x (NH) y (CHY) zA, x and y each represent integers from 1 to 10, preferably 1 to 5, y for 0 or 1, Y for hydrogen or an alkyl group with 1 to 4 carbon atoms, A for hydrogen, a hydroxyl group, an amino group or a (OCH2CHY)p group, P for integers from 1 to 10 and R 4 and R 5 independently of each other for hydrogen or R 1 stand. [5] Paste compositions according to at least one of claims 1 to 3, characterized by , that they contain amine compounds selected from the group formed by addition products of 1 to 25 mol of ethylene oxide and / or propylene oxide (in random or block distribution) to methylamine, dimethylamine, ethylamine, diethylamine, propylamine, dipropylamine, butylamine, dibutylamine, methylethylamine, diethyleneamine, dipropylenamine, ethanolamine, diethanolamine, triethanolamine and mixtures thereof. [6] Paste compositions according to at least one of claims 1 to 5, characterized bythat they (a) approximately 5 to approximately 80 wt.% colour pigments and / or fillers and (b) containing approximately 20 to approximately 95 wt.% poloxamers, provided that the amounts may be supplemented with other additives to reach 100 wt.%. [7] Paste compositions according to at least one of claims 1 to 6, characterized by that they (a) approximately 5 to approximately 80 wt.% colour pigments and / or fillers, (b) about 15 to about 90 wt% poloxamers as well as (c) containing approximately 1 to approximately 5 wt.% dispersants, provided that the amounts may be supplemented with further additives to 100 wt.%. [8] Paste compositions according to at least one of claims 1 to 7, characterized by that at 20°C they exhibit a plate / plate viscosity of less than 1,000 mPas when measured with a shear rate of 500 reciprocal seconds.