MXPA99004926A - Mix of pigme - Google Patents

Abstract

The present invention relates to pigment mixtures consisting of at least two components, component A being SiO2 flakes coated with one or more metal and / or metal oxides, and component B being platelet, acicular or spherical dyes or fillers, and their use in particular in varnishes, paints, printing inks, powder coating materials, plastics and cosmetic formulations

Description

MIXTURE. OF PIGMENT DESCRIPTION OF THE INVENTION The present invention relates to pigment mixtures consisting of at least two components, the component A being flakes of SIOO2 coated with one or more metal oxides and / or metals and the component B which is a dye in the form of platelet, acicular or spherical, or a filler, and its use in varnishes, paints, inks for printing, plastics, powder coating materials and cosmetic formulations. With platelet-shaped pigments, it is sometimes difficult to achieve hiding and luster capacity simultaneously to a satisfactory degree. For example, SÍO2 flakes or mica platelets coated with one or more thin layers of metal oxide, have characteristics of interference colors and a high luster, but at the same time, due to the transparent substrate, they have a high characteristic transparency and thus a comparatively deficient hiding capacity. German Patent DE-A-42 40 511 discloses a pigment mixture which is composed of an interference pigment and a platelet-shaped color pigment. The interference pigment comprises mica flakes u ref .; 30338 SÍO2 flakes coated with metallic oxides and the colored pigment can be made of colorful SÍO2 flakes.

This pigment mixture is incorporated into coating materials, printing inks or plastics. An object of the present invention is to provide a pigment mixture which is remarkable for a comparatively high hiding capacity, which has a good incorporation in the respective system in which it is used and which at the same time substantially excludes 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 present invention consists of at least two components, component A being SiO2 flakes coated with one or more metal oxides and / or metals, and component B being a platelet, acicular or spherical dye. , or a filler. By mixing the colorant with the coated SiO2 flakes, it is possible to give the systems in which it is being used a multiple inversion, the color effect intensifies and new color effects are achieved. Thus, the present invention provides a pigment mixture consisting of at least two components, component A being SiO2 flakes coated with one or more metal oxides and / or metals, and component B being platelet-like dyes, acicular or spherical, or fillers. Similarly, the present invention provides the formulations, such as paints, varnishes, printing inks, plastics, powder coating materials and cosmetic formulations, which comprise the pigment mixture of the present invention. The coated SiO2 flakes can be mixed with the colorant in any ratio. Preferably, the ratio of component A to component B is from 1:10 to 10: 1, in particular from 1: 2 to 2: 1. The SiO2 flakes produced in a continuous web according to International Publication WO 93/08237, are based on a transparent, colorless or colorless platelet matrix and generally have a thickness between 0.1 and 5 μm, in particular between 0.2 and 2.0 μm. The other two dimensions generally fall between 1 and 250 μm, preferably between 2 and 100 μm and, in particular, between 5 and 40 μm. SÍO2 flakes have one or more metallic layers and / or metal layers. Examples of suitable metal oxides or mixtures of metal oxides are titanium dioxide, zirconium oxide, zinc oxide, iron oxides and / or chromium oxide, especially TiO 2 and / or Fe 2 O 3. The SiO2 flakes can be coated, for example, in the manner described in International Publication WO 93/08237 (wet chemical coating) or in German Patent DE-A 196 14 637 (CVD process). Instead of the outer metal oxide layer, it is possible to use a semitransparent metallic layer. The metals suitable for this purpose are, for example, Cr, Ti, Mo, W, Al, Cu, Ag, Au and Ni. Preferred pigments have the following layer structure: flakes of SÍO2 + metal + SÍO2 + metallic oxide. In order to achieve special color effects, it is possible to introduce, additionally, fine particles in the nanometer size range, to the high or low refractive metal oxide layers. Examples of pigments suitable for this purpose are finely divided TiO2 or finely divided carbon (carbon black), with particle sizes in the range of 10 to 250 nm. By the light scattering properties of such particles, it is possible to exert a controlled influence on the luster and the hiding ability. Preferably, the SIOO2 flakes are coated with one or more metal oxides. The dyes suitable as component B for the pigment mixture of the present invention are all acicular and spherical dyes which are known to those skilled in the art and have a particle size of 0.001 to 10 μm, preferably 0.01 to 1. μm. The pigment mixtures of the present invention preferably comprise, as dyes, absorption materials and fillers. Spherical dyes include, in particular, TiO 2, colorful SiO 2, CaS 4, iron oxides, chromium oxides, carbon black, organic colored pigments such as anthraquinone, quinacridone, diketopyrrolopyrrole, phthalocyanine, azo pigments and isoindoline. The acicular pigments preferably comprise BiOCl, colorful glass fiber, α-Fe3? , colorful organic pigments such as azo pigments, β-phthalocyanine blue Cl 15.3, Cromophtal Yello 8GN (Ciba-Geigy), Igalith Blue PD56 (Ciba-Geigy), copper complex and azomethine Cl Yellow 129, Irgazine Yellow 5GT (Ciba- Geigy). Cosmetic formulations (especially decorative formulations) preferably include not only colorants and flakes of SIO2, but also, additionally as an important component, fillers (one or more) or mixtures thereof, in amounts of 1 to 50%, especially from 1 to 30% and very particular preference from 1 to 15%. Suitable fillers are those such as mica, talcum, TiO2 and mica, TiO2 + BaS? + mica, mica + silica, silica, silica + Ti0 + Fe203, BiOCl, BiOCl + mica, BiOCl + talc. These products are obtained under the Merck KGaA trademarks: Ronasphere®, Ronasphere® LDP, Micronasphere® M, Silk Mica, Satin Mica, Naturaleaf Powder, Low Luster Pigment, Extender W, Talkum Feinst Gepulvert [finely divided talcum powder], Biron®, Bital® and Mibiron®, and also nylon-12 (from Elf Atochem), nylon-6 (from Elf Atochem), boron nitride, Nylon Powder from (Elf Atochem), polyamide 12 (from Kobo), polyethylene (from Kobo), PTFE (from Presperse), lauroi lysine (from Ikeda), polymethyl methacrylate (from Ikeda) and calcium and aluminum borosilicate (from Presperse). The pigment mixture of the present invention is simple and easy to handle. The pigment mixture can be incorporated into the system in which it is used, simply by stirring. No grinding and dispersion of the pigments is necessary. The pigment mixture of the present invention can be used to pigment coating materials, printing inks, plastics, agricultural films, seed coatings, food colors, button pastes, drug coatings or cosmetic formulations. The concentration of the pigment mixture in the system in which it will be used to pigment, is generally between 0.1 and 70% by weight, preferably between 0.1 and 50% by weight and, in particular, between 1.0 and 10%, based on the solids content of the system. Usually this depends on the specific application. The plastics comprising the pigment mixture of the present invention in amounts of 0.01 to 50% by weight, in particular from 0.1 to 7% by weight, are often notable for a particular sparking effect. In the coatings sector, especially in automotive finishes, the pigment mixture is used -for 3-layer systems as well- in amounts of 0.1 to 10% by weight, preferably 1 to 3% by weight. The proportion in which the S: 02 flakes coated with the component B are mixed depends on the desired effect. The SiO2 flakes are preferably used with component B in a ratio of 1: 4, in particular of 1: 3. In the coating material, the pigment mixture of the present invention has the advantage that the color inversion effect is achieved with a single-layer coating (single-layer system or base layer in a two-layer system). ). This inversion of color is extremely pronounced even under diffuse light.

Compared with coating systems comprising a mica-based interference pigment instead of coated SiO 2 flakes, the coating systems with the pigment mixture of the present invention exhibit a markedly deeper effect and a shimmering effect. The pigment mixture of the present invention can also be used in decorative cosmetology and personal grooming. The concentration of use and the mixing ratio of SiO2 flakes with component B, especially organic and inorganic colored pigments and dyes of natural or synthetic origin, such as chromium oxide, ultramarine or SIOO2 or TiO2 pigments with spherical shape , depend on the medium in which they are going to be used and the effect that they want to achieve. The SÍO2 flakes can be mixed with other pigments in any proportion, with a ratio of 1:10 to 10: 1 being preferred. The useful concentration ranges from 0.01% by weight in a shampoo to 70% by weight in a compact powder. In the case of a mixture of SiO2 flakes with spherical fillers, such as SIO2, the concentration in the formulation can be from 0.01 to 70% by weight. Cosmetic products such as nail varnishes, lipsticks, compact powders, shampoos, loose powders and gels, are notable for particularly interesting gloss effects and / or color effects. The gleaming effect on the nail varnish can be markedly increased in relation to conventional nail varnishes with the aid of the pigment mixtures of the present invention. In addition, the pigment mixture of the present invention can be used in bath products, toothpastes and to improve the appearance of foods, for example as dyes for dough or coatings. In the pigmentation of binder systems, for example for paints and inks for rotogravure printing, offset printing or screen printing, or as a precursor for printing inks, in the form, for example, of highly pigmented pastes, granules, pellets, etc., mixtures of pigment, especially those consisting of SiO2 flakes coated with spherical dyes such as TiO2, carbon black, chromium oxide, iron oxide and also organic colored pigments, have been found particularly suitable. The pigment mixture is generally incorporated in the printing ink in amounts of 2 to 35% by weight, preferably 5 to 25% by weight and in particular 8 to 20% by weight. Offset printing inks may comprise the pigment mixture in an amount of up to 40% by weight or more. The precursors for preparing inks for printing in the form, for example, of granules, pellets, briquettes, etc., contain up to 95% by weight of the pigment mixture of the present invention in addition to the binder and the additives.

The mixing ratio of component A with respect to component B is preferably in the range of 1:10 a : 1 The printing inks comprising the pigment mixture of the present invention exhibit more pure dyes and their printing characteristics are better due to the good viscosity values. Thus, the present invention also provides formulations comprising the pigment mixture of the present invention. The following Examples are intended to illustrate the present invention, without limiting it. EXAMPLES Example 1 Printing ink The pigment was incorporated in the binder containing the solvent, by stirring at 600 r.p.m. and printing inks were subsequently coated with a knife on black and white cards. Ink No. 1: 88.0 g of Gebr. Sch idt, 95 MB 011 TW 10.0 g of SiO2 flakes coated with Fe2? 3 with a particle size of 5 to 40 μm 2.0 g of Gebr. Schmidt, 95 MB 022-TW (green) Ink No. 2: Comparison 88.0 g of Gebr. Schmidt, 95 MB 011 TW 10.0 g of mica coated with Fß2? 3 with a particle size of 10 to 60 μm 2.0 g of Gebr. Schmidt, 95 MB 022-TW (green) The color card with the No. 1 ink exhibits, in visual terms, a markedly better color reversal than the colored cards with the comparison ink No. 2. Example 2: - Automotive finishing 2.0 g of SiO2 flakes coated with Fe2? 3 with a particle size of 5 to 40 μm 1.5 g of Heliogen Blue L 6930 0.2 g of Hostaperm Green 8G 0.05 g of carbon black grade pigment FW 200 66.6 g of coating base (A4) MP system (FK = 19%) 29.65 g of diluent mixture A dye was achieved with a very pronounced inversion of blue to green and golden highlights, which has the ability to change even deep violet. Example 3: - Plastic Granules of the polypropylene PP Stamylan PPH10 (from DSM) and polystyrene 143E (from BASF) were mixed, in each case with a) 1% of SiO2 flakes coated with Fß2? 3 with a particle size of 5 to 40 μm b) a mixture of 1% of SiO2 flakes coated with Fß2? 3 with a particle size of 5 to 40 μm and 0.1% of PV Fast Blue B2G01 (Pigment Blue 15.3 of Clariant) c) 1% mica coated with Fß2? 3 with a particle size of 10 to 60 μm d) a mixture of 1% mica coated with Fe2Ü3 with a particle size of 10 to 60 μm and 0.1% of PV Fast Blue B2G01 (Pigment Blue 15.3 from Clariant) The pigmented granules were subsequently processed in an injection molding machine to form small staggered plates. The differences between the two plastics are slight, so that in the Table presented below, only a qualitative statement is made for both materials: The combination of a blue pigment with, in each case, a pigment with luster (SÍO2 or based on mica) emphasizes very well how different is the inversion of color of the two pigments with luster. Example 4: - Shade for eyelids Phase A 5.00% of Ronasphere® (Merck KGaA silica) 25.00% of SiO2 flakes coated with TiO2 with a particle size of 5 to 40 μm (from Merck KGaA) . 00% of green pigment Cl Pigment Green 18 (CI77289) 47.42% of talc 7.18% of Solanum Tuberosum (potato starch) 2.40% of magnesium stearate Phase B 6.96% of isopropyl stearate 0.40% of cetyl palmitate 0.40% of pertrolate 0.08% preservative The components of phase A were combined and a premix was formed. Then, the melted B phase was added, dropwise and with stirring, to the powder mixture. The powders were compressed at 40-50 bar. Example 5: - Lipstick Phase A 8.25% wax alba 4.95% ceresin, copernica cerifera 3.30% lanolin oil 5.28% isopropyl myristate 1.98% mineral oil 0.03% tocopherol, ascorbyl palmitate, ascorbic acid, acid citric, polyethylene glycol PEG-8 0.06% preservative 0.50% aroma 1.00% Lithol rubine BK, red pigment CI Pigment Red 57: 1 (Cl 15850) c.b.p. 100.0% Ricinus Communis (20% castor oil) Phase B 2.00% Ronasphere® (Merck KGaA silica) 15.00% SiO2 flakes coated with iron oxide with a particle size of 5-40 μm (from Merck) KGaA) The components of phase A were heated to 75 ° C and melted. The pigments of phase B were added and the whole batch was stirred well. Subsequently, the composition of the lipstick was stirred for 15 minutes in the casting apparatus, which had been preheated to 65 ° C. The homogenous melt was emptied into molds that had been preheated to 65 ° C. Subsequently, the molds were cooled and the cold molded mass was removed. 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 (1)

CLAIMS Having described the invention as an antecedent, the content of the following claims is claimed as property: 1. A pigment mixture characterized in that it comprises at least two components, the component A being SiO2 flakes coated with one or more metal oxides and / or metals, and component B which is platelet-shaped, acicular or spherical, or fillers. 2. The pigment mixture according to claim 1, characterized in that component A comprises SiO2 flakes coated with TiO2 and / or Fe2 33. 3. The pigment mixture according to any of claims 1 or 2, characterized in that the component B comprises colored glass particles, carbon black, silica, colorful organic pigments and / or inorganic colored pigments. . 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 varnishes, paints, especially automotive finishes, printing inks, plastics, powder coating materials, seed coloring, in cosmetic formulations and to improve the appearance of food . 6. Formulations characterized in that they comprise a pigment mixture according to claim

1.