MXPA99012001A - Pigment mixture - Google Patents

Abstract

La presente invención se refiere a las mezclas de pigmento que contienen al menos dos componentes, el componente A que son hojuelas de A1203 recubiertas con uno o más metales,óxidos metálicos y/o Sulfuros metálicos, y el componente B que son pigmentos de efecto especial, y a su uso en barnices, pinturas, tintas de impresión, lotes maestros, plásticos y formulaciones cosméticas.

Description

PIGMENT MIX DESCRIPTION OF THE INVENTION The present invention relates to pigment mixtures containing at least two components, component A which are leaflets of A1203 coated with one or more metals, metal oxides and / or metal sulfides, and component B which are pigments of special effect , and its use in varnishes, paints, inks for printing, plastics and cosmetic formulations. With the lamella-shaped pigments, the hiding power and luster are often difficult to perform simultaneously to a satisfactory degree. For example, Si02 flakes or mica flakes coated with one or more thin metal oxide layers characterize interference colors and a high luster but at the same time, due to the transparent substrate, they characterize a high transparency and therefore a power of comparatively poor hiding. In this way, European Patent EP 0,562,329 describes a pigment mixture comprising Si02 flakes coated with oxide of REF .: 31907 iron, in combination with mica pigments coated with iron oxide. German Patent DE-A-42 40,511 discloses a pigment mixture which consists of an interference pigment and a color pigment in the form of a lamella. The interference pigment comprises mica flakes coated with metal oxide or SiO2 flakes, and the color pigment may be uncoated, colored SiO2 flakes. This pigment mixture is incorporated into coating materials, printing inks or plastics. The object of the present invention is to provide a pigment mixture that is notable for its relatively high hiding power and which lends itself well to incorporation into the respective system in which it is used, and for which it is widely discarded at the same time. time a pigment / dye separation in the system. Surprisingly, a pigment mixture has now been found which does not have any of the disadvantages indicated above. The pigment mixture of the invention consists of at least two components, component A which are leaflets of A1203 coated with one or more metals, metal oxides - ^^ • ^ itiißa? Dí-i? I -? - iÉu - and / or metal sulphides, and component B which is one or more special effect pigments. The mixture of pigments with special effect to the leaflets of coated A1203 is able to give the systems in which they are used, a multiple scintillation, the color effect is intensified, and new color effects are achieved. The invention thus provides a pigment mixture containing at least two components, component A which are leaflets of A1203 coated with one or more metals, metal oxides and / or metal sulfides, and component B which is one or more pigments of special effect. The invention also provides formulations, such as paints, varnishes, printing inks, plastics, agricultural films and cosmetic formulations, which comprise the pigment mixture of the invention. The coated A1203 flakes can be mixed in any proportion with the special effect pigments. The ratio of component A to component B is preferably from 1:10 to 10: 1, in particular from 3: 1 to 5: 1.

Aluminum oxide coated in a flake form is commercially available for example from Merck KGaA under the trade name Xirallic®. a-Al203 in the hexagonal flake forge having a particle diameter greater than 10 μm and a ratio between dimensions (particle diameter / thickness) of 5-10, is known from the Patent Japanese JP-111239/1982 (Open to the Public No.). Japanese Patent Publication No. 72527/1991 discloses α-Al203 in the form of flakes having an average particle diameter of 0.5-3 μm. Japanese Patent JP-39362 / I 992 (Open to the Public No.) discloses A1203 in the form of fine particles in the form of plates of a system of hexagonal crystals with the plane perpendicular to the axis c developed on a plate. The preferred A1203 flakes are flakes composed of aluminum oxide (as a major constituent) and titanium dioxide (as a minor constituent) which are known from U.S. Patent No. 5,702,519.

These A1203 flakes are prepared from a uniform aqueous solution of water-soluble aluminum salt and titanium salt, by hydrolysis with an aqueous solution of alkali carbonate in the presence of an aqueous solution containing an alkali metal salt such as sulfate. of alkali metal and phosphoric acid or phosphate, which is dried by evaporation (dehydration by heating), and treatment of the molten salt. The leaflets of A1203 are provided with one or more layers of metal oxide. Examples of suitable metal oxides or metal oxide mixtures are titanium dioxide, zirconium oxide, zinc oxide, iron oxides (Fe203 and / or Fe304) and / or chromium oxide, especially Ti02 and / or Fe203. The leaflets of A1203 can be coated in the same way as the pigments with pearl luster. Coatings with a metal oxide can be obtained by any known methods, such as hydrolysis of a metal salt by heating or alkali, which deposits the metal oxide hydrate, followed by calcination. The leaflets of A1203 can also be coated with one or more layers of a metal or metal alloy selected for example from chromium, nickel, silver, bismuth, copper, tin, or nickel-iron-molybdenum alloy. The leaflets of A1203 coated with a metal sulphide are coated with sulfides, for example tungsten, molybdenum, cerium, lanthanum or rare earth elements. The leaflets of A1203 can be coated by wet chemical coating, through CVD or PVD processes. The components B suitable for the pigment mixture of the invention are all special effect pigments familiar to those with experience in the field of effect pigments, examples being metallic effect pigments, such as aluminum, copper, zinc and its alloys. Aluminum and gold-bronze alloys are preferably mentioned, especially those having a particle size of 2 to 40 μm. The pigment mixtures of the invention preferably comprise iron oxide in the form of lamellae, coated or uncoated, aluminum flakes or coated aluminum flakes. Special effect pigments of this type are marketed by BASF under the name Paliocrom®, by Eckart-Werke under the name Stapa®, and by Flex Company under the name ChromaFlair®. The following pigments should also be mentioned: pearlescent luster pigments, Ti02 flakes or Si02 flakes coated with one or more metal oxides, such as Ti02 or Fe203, for example, graphite lamellae, BiOCl or glass flakes coated with one or more metal oxides, liquid crystal polymer particles (LCP), holographic pigments and multilayer pigments. The pearlescent luster pigments, mica flake pigments coated with one plus metal oxides are obtainable, for example, from Merck KGaA, Darmstadt, under the trade names Iriodin®, Afflair® and Timiron®. The last pigments are known, for example, from the German Patents and German Patent Applications 14 67 468, 19 59 998, 20 09 566, 22 14 545, 22 15 191, 22 44 298, 23 13 331, 25 22 572, 31 37 808, 31 37 809, 31 51 343, 31 51 354, 31 51 355, 32 11 602 and 32 53 017. The mica pigments coated with Ti02 and / or Fe203 are used in particular. Like the filosilicato, natural mica and synthetic mica are suitable. In addition, the pigment mixture of the invention may contain organic or inorganic colorants, thixotropic agents, wetting agents, dispersing agents, water, organic solvent or solvent mixtures, etc. The pigment mixture of the invention is simple and easy to handle. The pigment mixture can be incorporated into the system in which it is used by simple agitation. No laborious grinding and dispersion of the pigments is necessary. The pigment mixture of the invention can be used to pigment coating materials, printing inks, plastics, agricultural films, button pastes, for the coating of seeds, for the coloration of food, coatings of medicines or cosmetic formulations. The concentration of the pigment mixture in the system in which it will be used for pigmenting is generally between 0.01 and 50% by weight, preferably between 0.1 and 5% by weight, based on the total solids content of system. This concentration is generally dependent on the specific application. Plastics comprising the pigment mixture of the invention in amounts of 0.1 to 50% by weight, in particular 0.5 to 7% by weight, are frequently notable for a mirroring effect as particularly sparks. In the field of coatings, especially in automotive finishes, the pigment mixture is used in amounts of 0.5-10% by weight. The proportion in which the A1203 flakes are mixed with the B component, especially the coated Si02 flakes or the coated mica flakes, depends on the desired effect. The leaflets of A1203 are preferably used with component B in a ratio of 1:10 to 10: 1, in particular of 3: 1. In the coating material, the pigment mixture of the invention has the advantage that the effect scintillation desired color by coating single layer (systems a single coating or as a basecoat in a two coatings is obtained ). This color scintillation is extremely pronounced even under diffuse light. Compared with coatings comprising an interference pigment instead of the coated A1203 flakes, the coatings with the pigment mixture of the invention show a marked depth effect and a luster or glow effect and also a color scintillation strong. In the pigmentation of binder systems, for example for paints and printing inks for gravure printing, transfer printing or screen printing, the pigment mixtures consisting of flakes A1203 ^ ¡^ Coated with Stapa® aluminum and Ecart-erke gold-bronze pastes, have proven to be particularly suitable. The pigment mixture is incorporated into the printing ink in amounts of 2-50% by weight, preferably 5-30% by weight and in particular, 8-15% by weight. The mixing ratio of component A to component B is preferably in the range of 1:10 to 10: 1. The printing inks comprising the pigment mixture of the invention show more pure shades and are of improved printing capacity due to the good viscosity values. The invention likewise provides pigment preparations comprising coated A1203 flakes, effect pigments, binders and, if desired, additives, said preparations being in the form of free-flowing granules, substantially free of solvent. Such granules contain up to 95% by weight of the pigment mixture. A pigment preparation in which the pigment mixture of the invention is formed into paste with a binder and with water and / or with an organic solvent, with or without additives, and the paste is subsequently dried and brought into a compact particulate form , for example, granules, pellets, briquettes, a batch HMlíriMillMÉÉÍ-iÉil-É ~ J * aS &? .. ..-. ~. master or tablets, is particularly suitable as a precursor for printing inks. The present invention thus also provides formulations containing the pigment mixture of the invention. It is intended that the following examples illustrate the invention however, without limiting it.

Eg emplos Example 1: Painting Formulations that consist of 2. 50% A1203 flakes coated with Fe203 having a particle size of 5-60 μm (Merck KGaA) 1.50% Green monastral 6Y spec. (Zeneca) 0.50% Yellow cappoxyt 4214 (Capelle) 0.03% Carbon black grade pigment FW 200 (Degussa) 0. 40% Dollaraluminum Alpate 7620 NS (Alean Toyo Europe) The rest: Base for paint with a solids content of 19% (acrylate-melamine) and diluent mixture.

Example 2: Printing for rotogravure Printing ink consisting of 70 g binder based on Gebruder nitrocellulose Schmidt, 95MB011, with a solids content of approximately 20% 30 g Pigment, for example, 15 g of Chromal IV (Eckart) AL 14-18 μm and 15 g of flakes of A1203 coated with Fe203 of particle size from 5 to 60 μm 30 g l-ethoxy-2-propanol Example 3: Plastic 1 kg of polystyrene granules were wetted uniformly in a drum mixer with 5 g of adhesion agent. Then add 35 g of A1203 flakes coated with Fe203 of particle size from 5 to 60 μm and 7 g of Iriodin® 121 (mica prigrid coated with Ti02 from Merck KGaA, Darmstadt, Federal Republic of Germany, with particle size from 5 to 20 μm) and the components are mixed for 2 minutes. These granules are processed under customary conditions in a molding machine > ^ Uf by injection to dct small scale-like plates measuring 4 x 3 x 0.5 cm. The small scale-like plates are remarkable for their ^ ustre. Example 4: Eyeshadow Phase A . 00% A1203 flakes coated with Ti02 with a particle size of 5-60 μm (Merck KGaA) 15.00% Timiron® Super Blue (mica coated with Ti02 with a particle size of 10 to 60 μm Merck KGaA) 49.50% Talc 7.50% Solanum Tuberosum (potato starch) 2.50% Magnesium stearate Phase B 9. 14% Isopropyl Stearate 0.53% Cetyl Palmitate 0.53% Petrolatum 0.21% Fragrance 0.11% Conservative The constituents of Phase A are combined and formed in a premix. The molten phase B is then added dropwise with stirring to the powder mixture. The powders are pressed at 40-50 bar.

Example 5: Bath gel Phase A 0. 10% A1203 flakes coated with Ti02 particle size from 5 to 60 μm (Merck KGaA) 0.10% Timiron® Super Blue (mica coated with Ti02 particle size from 10 to 60 μm Merck KGaA) 0.75% Xanthan gum add water up to 100.00% 10 Phase B . 00% decyl glucoside 6.65% Texapon ASV Lauret-sodium sulfate Lauret-magnesium sulfate Lauret-8-sodium sulfate Lauret-8-magnesium sulfate Olet-sodium sulfate - -'- --- ^ fe- * "- '•• | iHf'? R? - r ni n"? F i - ~ ¥ *? ¡Rf, irrf -i 0.20% Conservative 0.50% fragrance Phase C 0. 15% Citric acid 10.00% Water For Phase A, the pigments are stirred in water. The xanthan gum is slowly dispersed with stirring and the mixture is stirred until the gum has dissolved. Phases B and c succession are added, and slow agitation is continued until all the components are homogeneously distributed.

It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention.

Claims (7)

CLAIMS Having described the invention as above, the content of the following claims is claimed as property:

1. A pigment mixture, characterized in that it contains at least two components, component A which are leaflets of A1203 coated with one or more metals, metal oxides and / or metal sulfides, and component B which are special effect pigments.

2. The pigment mixture according to claim 1, characterized in that component A comprises leaflets of A1203 coated with Ti02 and / or Fe203.

3. The pigment mixture according to claim 1 or 2, characterized in that the component B comprises metal flakes coated with one or more metal oxides, graphite flakes, aluminum flakes, phyllosilicates, flakes of Fe203, Si02, or Ti02 uncoated or Coated with one or more oxides - ^ ^ ^ ^ ^ Metallic sy, glass lamellae and / or ceramic lamellae.

4. The pigment mixture according to any of claims 1 to 3, characterized in that component A and component B are mixed in a ratio of 10: 1 to 1:10.

5. The use of the pigment mixture according to claim 1, in paints, varnishes, printing inks, powder coating materials, master batches, plastics, for coloring seeds, in cosmetic formulations and for improving foods.

6. The formulations, characterized in that they contain a pigment mixture according to claim 1.

7. The pigment preparation, which contains a pigment mixture according to claim 1 and a binder, characterized in that it is in the form of free-flowing granules, substantially free of solvent. fe ^^^^ g ^ *