Red metallic latex articles

Abstract

The present application describes a latex or latex article having a red metallic surface finish, wherein the red metallic surface finish comprises (a) one or more metallic fillers comprising metal and / or metal oxide particles and (b) one or more red, violet and / or orange color absorption pigment particles, imbedded in the latex or latex article at least in the surface thereof, wherein the metallic surface finish has a red metallic effect with the following characteristics: a* = 25-80 at 45°; b* = 10-40 at 45°; Flop Index (FI) according to Formula (1) of FI ≥ 9.0.

Description

[0001]Sun Chemical Corporation C-1326 CE17216PC 1 Red Metallic Latex Articles DESCRIPTION The present invention relates to a latex article having a red metallic surface finish and a process for producing it. BACKGROUND OF THE INVENTION Latex article manufacturers desire to differentiate their products, e.g. gloves, balloons and other elastomeric consumer products, for decorative or functional purposes. In many of these latex articles, having a metallic appearance is particularly desirable, and in many latex articles, the metallic appearance is available in many different colors. These colors are achieved by combining an aluminum pigment with an absorption pigment. The preferred process is to blend an organic pigment dispersion of the target color with a preparation of the aluminum pigment in the latex vat, which is then used in the typical formation process for the desired latex articles. The resulting latex article maintains the metallic reflectance with the absorption color once it is completely cured. However, this does not work for shades of red where the blue reflectance of the aluminum shifts the color to very blue shades of red with the result leading to a magenta appearance regardless of the pigment shade. In order to achieve true red shades, latex article manufacturers must make a two-layer article, with the inner layer being the aluminum metallic layer and the outer layer being a red layer, which minimizes the blue reflections and allows to achieve true red colors. Such processes, however, impose more complexity, longer production times and higher costs on for latex article manufacturers than the single layer process. One particular area where this problem is prevalent is in the manufacture and decoration of latex balloons, though the present application is suitable for use in other latex articles as well. Other applications for the present invention include latex articles such as erasers, condoms and diaphragms, rubber household gloves, medical gloves, beach toys and other novelties, catheters, dental products (wedges, orthodontic rubber bands), elastic in clothing, etc. US2019 / 0192984 discloses an inflatable balloon made from a latex composition Sun Chemical Corporation C-1326 CE17216PC 2 comprising latex and passivated flakes made of metal such as aluminum, nickel, iron, copper, lead, zinc, chromium, tin or metal alloys, and a metal chelate complex. Until now, achieving a true red color with aluminum was not possible in a latex article. To solve this issue, we found that using iron oxide coated aluminum in combination with red pigments gives a true red metallic effect. The current application provides formulations that result in a true red color with the metallic appearance that is desired by latex article manufacturers. The invention thus relates to a latex article having a red metallic surface finish, wherein the red metallic surface finish comprises one or more metallic fillers comprising (a) metal and / or metal oxide particles and (b) one or more red, violet and / or orange color absorption pigment particles, imbedded in the latex article at least in the surface thereof, wherein the metallic surface finish has a red metallic effect with the following characteristics: a* = 25-80 at 45° b* = 10-40 at 45° Flop Index (FI) according to Formula (1) of FI ≥ 9.0 in which L* 15, L* 110 and L* 45 are color measurements under the respective viewing angles and a*and b* are color dimensions of the Lab color space at 45°. A Lab color space is a color-opponent space with dimension L for lightness and a* and b* for the color-opponent dimensions of redness–greenness and blueness– yellowness, respectively. L* 15, L* 110 and L* 45 are color measurements under the respective viewing angles and are measured by „BYK-mac i“, and the FI value is automatically calculated using the above indicated formula. The BYK-mac i objectively measures color under different viewing angles as well as Sun Chemical Corporation C-1326 CE17216PC 3 sparkle and graininess. Additionally, it detects and quantifies fluorescent light in the visible range and has the following features: Total color impression: - 5-angle color measurement for light / dark travel evaluation: 15° / 25° / 45° / 75° / 110° - Additional color measurement behind the gloss for color flop analysis: -15° - Sparkle and graininess measurement for flake characterization - Detection and quantification of fluorescent light excited in the visible range (Intensity Emission) Color Measurement: • Color Geometry 45° illumination; -15°, 15°, 25°, 45°, 75°, 110° aspecular viewing • Measuring Area 23 mm diameter • Spectral Range Colorimetric 400 - 700 nm, 10 nm resolution • Measurement Range 0 to 600 % reflectance • Repeatability Color 0.01 ΔE* (10 consecutive measurements on white) • Reproducibility Color Grey BCRA II tiles: avg. ΔE* < 0.10 Chromatic BCRA II tiles: avg. ΔE* < 0.25 • Color Scales ΔE*; ΔE CMC; ΔE 94; ΔE 2000; ΔE 99; ΔE DIN6175-2019 and customer specific scales • Color Indices Flop, Int-Em • Illuminants A; C; D50; D65; F2; F7; F11; F12; CIE 015:2018 LED illuminants • Observer 2°; 10° Effect Measurement: • Effect Geometry 15°, 45°, 75° and diffused illumination; perpendicular viewing with camera • Effect Parameters ΔS; ΔS_a; ΔS_i; ΔG • Repeatability Effect S_a / S_i: 5% or > 0.50 / G = ± 0.05 • Reproducibility Effect S_a / S_i: 10% or > 1.00 / G = ± 0.15 Sun Chemical Corporation C-1326 CE17216PC 4 The object is furthermore achieved by a process for producing the latex article of any preceding claim having a red metallic surface finish, by mixing a liquid or fluid natural and / or synthetic latex with the red metallic surface finish comprising one or more metallic fillers (a) comprising metal and / or metal oxide particles and one or more red, violet and / or orange color absorption pigment particles (b), or with a particle composition containing (a) and (b), and forming a latex article from the so obtained mixture, so that the red metallic surface finish is imbedded in the latex article at least in the surface thereof and has a red metallic effect, or by first forming a latex article from a liquid or fluid natural and / or synthetic latex and thereafter coating the dried article with a mixture of a liquid or fluid natural and / or synthetic latex and the red metallic surface finish comprising one or more metallic fillers (a) comprising metal and / or metal oxide particles and one or more red, violet and / or orange color absorption pigment particles (b), or with a particle composition containing (a) and (b), and forming a latex coating from the mixture on the latex article, so that the red metallic surface finish is imbedded in the latex article in the surface thereof and has a red metallic effect. Preferably, the liquid or fluid latex and / or the particle composition containing (a) and (b) contain water and one or more adjuvants, selected from the group consisting of non- silicone defoamer, polyalkylene glycol, non-ionic surfactant, preferably alcohol ethoxylate, rheology modifier, preferably acrylic polymer and / or acrylic copolymer emulsion, preferably in water. The object is furthermore achieved by a red metallic latex article resulting from the above process. The object is furthermore achieved by a particle composition, comprising (a) one or more metallic fillers comprising metal and / or metal oxide particles, as defined in one of claims 1 to 11, and (b) one or more red, violet and / or orange color absorption pigment particles, as defined in one of claims 1 to 11, Sun Chemical Corporation C-1326 CE17216PC 5 wherein the particle composition produces a red metallic surface finish in latex articles containing the particle composition, at least in the surface thereof, wherein in the latex articles the metallic surface finish has a red metallic effect with the following characteristics: a* = 25-80 at 45° b* = 10-40 at 45° Flop Index (FI) according to Formula (1) of FI ≥ 9.0 in which L* 15, L* 110 and L* 45 are color measurements under the respective viewing angles and a*and b* are color dimensions of the Lab color space at 45°. The object is furthermore achieved by the use of the particle composition as a red metallic surface finish for latex articles at least in the surface thereof, wherein in the latex articles the metallic surface finish has a red metallic effect with the above characteristics, and by the use of a particle or pigment dispersion as defined above for coloring a photosensitive resist formulation for manufacturing a color filter, a printing ink, a liquid ink, a coating composition, a paint, plastics, a film or a fiber. The object is furthermore achieved by a particle or pigment dispersion comprising a particle composition as defined above, and further comprising a polymeric dispersant. There are 2 types of aluminum flake in the Paliocrom line-up. One of them is „corn flake type“ and the other is „Silver dollar type“. Regarding the particle size, D50 is from 10 to 22 micron and preferably 20 micron. The particle size of PALIOCROM GOLD L2158 (NV 72.5%), D50 is from 17 micron and the composition of the paste is Aluminum (approx. 28%), Silicon dioxide (approx. 13%) and Iron oxide(approx.32%) plus solvent (approx.27%). Sun Chemical Corporation C-1326 CE17216PC 6 DETAILED DESCRIPTION The present inventors discovered that by changing the shade of the metallic color from a silver color aluminum pigment to a, preferably multilayer, metallic pigment that is in the gold, red, or orange color space, a true red can be achieved with a single layer latex material . Such pigments, component (a) metal and / or metal oxide particles according to the present invention, are preferably designed with or comprise a substrate material that is coated with one or more metal oxides having refractive indices which preferably are different from the refractive index of the substrate. For example, an aluminum substrate can be coated with iron oxide (Fe2O3) with a resulting black, brown, gold, red, orange, or yellow color of the particle (a). There can alternatively, or preferably additionally, be one or more other coating layers such as SiO2, TiO2, SnO2, ZnO, Al2O3, and / or other metal oxides known to one skilled in the art. Other substrates may also be used, such as mica, glass, Al2O3, copper, silver, nickel, stainless steel, alloys of various metals, such as zinc and copper. The coatings preferably amount to 5 to 95, more preferably 10 to 80, most preferably 20 to 70 wt%, based on the coated pigment (a) or alternatively based on the substrate of coated pigment (a). The shape of the pigment (a) can be freely chosen. Preferably, the pigment is thinner in one room direction than in the other two: Preferably, the shape is sheet-, coin-, (corn) flake-, or confetti-like. Preferred are silver-dollar-type and (corn) flake-type. The particle size, D50, is preferably from 5 to 100, more preferably 10 to 50, most preferably 10 to 35 micron, for example from 10 to 22 micron and preferably 15 to 22, most preferably 17 to 20 micron (micrometer). Latex manufacturing for balloons, gloves, and other products is typically carried out in a waterborne latex tank. The pigments must be fully dispersed in the latex tank before the latex article is formed on a mold by dipping the mold into the latex solution. The color of the pigments in the latex solution must remain stable for an extended period of time. As such, pigments are provided as preparations to maximize the color value of the final latex product. Sun Chemical Corporation C-1326 CE17216PC 7 Pigments (a) of the type described above must be compatible with the latex solution and other components in the tank. Additionally, the pigment should maintain the color value once added to the tank. For this purpose, the pigment is preferably surface treated with a stabilizer to extend the stability in the latex solution. Such stabilizer surface treatments include, but are not limited to, polymer encapsulation, silica encapsulation, passivation, e.g. with molybdenum acid, vanadium, chromium, phosphate esters, phosphonic acid, and other chemistries known to one skilled in the art. Other useful passivating chemistries include amines, carboxylic acids, or organophosphates, and polymers with groups that complex with iron oxide. Optionally, the pigment can be provided as a prefabricated preparation or concentrate. A pigment preparation can be a solid or liquid with the preferred form being a liquid dispersion of the pigment, preferably in water. A liquid preparation can be prepared with the additional use of a dispersing agent such as non-ionic surfactants, anionic surfactants, or polymeric dispersants or mixtures thereof. Combinations of surfactants or surfactants and polymers may also be used in said preparations. Examples of surfactants are alcohol ethoxylates, fatty acid ethoxylates, polyglycol ethers, alkylbenzene sulfonates, Thus, the pigment (a) dispersion preferably comprises the pigment (a), a liquid dispersing medium, preferably water, and at least one dispersant, preferably selected from the group consisting of non-ionic surfactants, anionic surfactants, or polymeric dispersants or mixtures thereof. The amount of dispersant preferably is 0.1 to 10, more preferably 0.5 to 5, most preferably 0.5 to 3 wt%, based on the pigment (a) dispersion. Alternatively, a solid preparation that is easily dispersed or stirred into water is also acceptable. Such solid preparations include the pigment (a) and a solid carrier that is compatible with a waterborne system. Carriers include phosphates, phosphate ester, phosphonic acids, which have some hydrophilic nature that allows for the products to be easily incorporated into a waterborne solution of latex. The pigment concentration is typically in a range of 40% to 95% by weight. The carrier is typically present in a concentration of 5% to 60% by weight. Sun Chemical Corporation C-1326 CE17216PC 8 The process to make latex articles consists of a pre-dispersion process, dispersion process, and a molding process including a dry process. In the pre-dispersion process, pH adjusted pigment (a) dispersion and natural latex are mixed well together. Additional natural latex and color pigment (b) are added into the pre-dispersion and mixed well. Molds, e.g. for ballons or gloves are dipped into a coagulator such as calcium nitrate and dried. The dried molds are dipped into the natural latex solution and afterwards baked, at 60 to 120°C preferably at 80 to 100 °C until cured. In the present invention, 1-5 wt% of iron oxide coated metallic pigments (a) such as Paliocrom (from Sun Chemical), Stellar (from CQV), Zenexo (from Schlenk), Meoxal (from Merck) etc., preferably aluminum; and 0.1-5.0 wt% of organic pigments (b) are combined in natural latex to obtain a red metallic target color of: a* = 25-80 at 45° b* = 10-40 at 45° Flop Index (FI) according to Formula (1) = ≥ 9.0 in which L* 15, L* 110 and L* 45 are color measurements under the respective viewing angles and a*and b* are color dimensions of the Lab color space at 45°. Flop is a change in the value, hue or chroma of a dried ink, paint, or otherwise colorized finish when it is viewed from different angles. For example, viewed head on, a color may be a good match with a test panel, but when you move 45 or 60 degrees to the left or right, the color changes. There are 2 types of aluminum flakes in Paliocrom’s line-up. One of them is „corn flake type“ and the other is „Silver dollar type“. Regarding the particle size, D50 is from 10 to 22 micron and preferably 20 micron. Sun Chemical Corporation C-1326 CE17216PC 9 Table 1: Amount of Iron oxide vs substrate in various iron oxide metallic effect pigments Fe2O3% Composition Appearance description Al Mica TiO2Fe2O3vs Al / Pearl D5020 micron, PALIOCROM Iron oxideGOLD L2024goldcoated42 15 36%aluminum flake D5017 micron, PALIOCROM Iron oxideGOLD L2158goldcoated28 31.5 113%aluminum flake D5017 micron, PALIOCROM Iron oxide RED L3258Redcoated19 43 226%aluminum flake Sun MICA D5020 micron, Gold 284- gold Iron oxide 19 co59 18 24 31%12 ated pearlescent flake The particle size of PALIOCROM GOLD L2158 (NV 72.5%), D50 is 17 micron and the composition of the paste is Aluminum (approx.28%), Silicon dioxide (approx. 13%) and Iron oxide(approx.32%) plus solvent (approx.27%). The red, violet and / or orange color absorption pigment particles (b) reflect a red, violet and / or orange color .The, preferably red, absorption pigment (b) can be an inorganic or preferably an organic pigment or a mixture of two or more thereof. Preferably it is selected from the group consisting of quinacridone, diketopyrolopyrollidone, azo red, azo orange, dioxazine, naphthol, diarylide, perylene, disazo orange, benzimidazolone, pyrazolone, perinone, azomethine, anthraquinone, triarylcarbonium, thioindigo, isoindoline, including substitutions of the general chemical structures, inorganic mixed metal and mixed metal oxide red pigments, and blends thereof. More preferably, the red absorption pigment is selected from the group consisting of Pigment Red 122, Pigment Red 202, Pigment red 188, Pigment Red 269, Pigment Red 254, Pigment Red 57:1, Pigment Red 48:2, Pigment Violet 23, and blends thereof. The average particle size of the red, violet and / or orange color absorption pigment Sun Chemical Corporation C-1326 CE17216PC 10 particles (b) can be freely chose, but often is in the nanometer range. The particles may have an average diameter from 0.1 nanometers to 200 nanometers, or from 0.1 nanometers to 15 nanometers in other embodiments. Particle sizes may be measured with a camsizer or other optical instrument. The amounts and weight ratio of components (a) and (b) in the latex or latex article can be freely chosen, depending on the desired final color effect and color depth or density. The amount of component (a) in the latex is preferably 0.1 to 20, more prefereably,0.5 to 10, most preferably 1 to 5 wt%, based on the final latex, which is 100 wt%. The amount of component (b) in the latex is preferably 0.01 to 20, more prefereably 0.1 to 10, most preferably 0.25 to 7.5 wt%, based on the final latex, which is 100 wt%. Suitable or preferred weight ratios of pigment (b) to (a) are evident from the examples below. Citation or identification of any document in this application is not an admission that such represents prior art to the present invention. EMBODIMENTS The present invention is further illustrated by the following set of paragraphs or embodiments and combinations of paragraphs or embodiments resulting from the dependencies and back-references as indicated. In particular, it is noted that in each instance where a range of embodiments is mentioned, for example in the context of a term such as "The process of any one of embodiments 1 to 5", every embodiment in this range is meant to be explicitly disclosed for the skilled person, i.e. the wording of this term is to be understood by the skilled person as being synonymous to " The process of any one of embodiments 1, 2, 3, 4 and 5". Further, it is explicitly noted that the following set of paragraphs and embodiments is not the set of claims determining the extent of protection, but represents a suitably structured part of the description directed to general and specific aspects of the present invention. Sun Chemical Corporation C-1326 CE17216PC 11 1. A process for providing a latex article with a red metallic finish, comprising a printing ink having one or more metallic fillers and one or more red, violet or orange absorption pigments, wherein the metallic finish has a red metallic effect with the following characteristics: a* = 25-80 at 45° b* = 10-40 at 45° Flop Index (FI) according to Formula (1) = ≥ 9.0 2. The process of embodiment 1, wherein the metallic fillers comprise one or more layers of metal or metal oxide. 3. The process of embodiment 2, wherein the weight of metallic fillers is 0.5 – 10 % by weight. 4. The process of any one of embodiments 1 to 3, wherein the metallic filler comprises 1 or more layers of metal or metal oxide and one or more layers of iron oxide. 5. The process of embodiment 4, wherein the metallic filler of claim comprises 30- 250 times (weight) iron oxide versus metal or metal oxide substrate. 6. The process of any one of embodiments 1 to 5, wherein the red absorption pigment is selected from the group consisting of quinacridone, diketopyrolopyrollidone, azo red, azo orange, dioxazine, naphthol, diarylide, perylene, disazo orange, benzimidazolone, pyrazolone, perinone, azomethine, anthraquinone, triarylcarbonium, thioindigo, isoindoline, including substitutions of the general chemical structures, inorganic mixed metal and mixed metal oxide red pigments, and blends thereof. 7. The process of any one of embodiments 1 to 6, wherein the red absorption pigment is selected from the group consisting of Pigment Red 122, Pigment Red 202, Pigment red 188, Pigment Red 269, Pigment Red 254, Pigment Red 57:1, Pigment Red 48:2, Pigment Violet 23, and blends thereof. 8. The process of any one of embodiments 1 to 7, wherein the latex article is selected from the group consisting of balloons, gloves and erasers. 9. A red metallic latex article, obtainable or obtained by the process of any one or more of embodiments 1 to 7. 10. A latex or latex article having a red metallic surface finish, wherein the red metallic surface finish comprises Sun Chemical Corporation C-1326 CE17216PC 12 (a) one or more metallic fillers comprising metal and / or metal oxide particles and (b) one or more red, violet and / or orange color absorption pigment particles, imbedded in the latex or latex article at least in the surface thereof, wherein the metallic surface finish has a red metallic effect with the following characteristics: a* = 25-80 at 45° b* = 10-40 at 45° Flop Index (FI) according to Formula (1) of FI ≥ 9.0 in which L* 15, L* 110 and L* 45 are color measurements under the respective viewing angles and a*and b* are color dimensions of the Lab color space at 45°. 11. The latex or latex article of embodiment 10, wherein the metallic fillers (a) comprise one or more surface layers (a2) of metal and / or metal oxide. 12. The latex or latex article of embodiment 10 or 11, wherein the amount of metallic fillers (a) in the latex or latex article is 0.5 – 10 % by weight, based on the latex or latex article having the red metallic surface finish. 13. The latex or latex article of any one of embodiments 10 to 12, wherein the metallic filler (a) comprises a metal oxide, preferably selected from the group consisting of mica, glass, Al2O3, and / or a metal, preferably selected from the group consisting of aluminium, copper, silver, nickel, zinc, stainless steel or alloys of two or more of these metals, as substrate (a1). 14. The latex or latex article of embodiment 13, wherein the metallic filler (a) comprises one or more surface layers (a2), selected from the group consisting of one or more surface layers of metal or metal oxide different from iron oxide and / or one or more surface layers of iron oxide on the substrate (a1), wherein the metal and metal oxide are different from the metal and metal oxide of the substrate. 15. The latex or latex article of embodiment 14, wherein the metallic filler (a) comprises a weight amount of iron oxide in the surface layer (a2) that is 30-250 times the weight amount of metal and / or metal oxide substrate (a1). 16. The latex or latex article of any one of embodiments 10 to 15, wherein the red color absorption pigment (b) is selected from the group consisting of quinacridone, Sun Chemical Corporation C-1326 CE17216PC 13 diketopyrolopyrollidone, azo red, azo orange, dioxazine, naphthol, diarylide, perylene, disazo orange, benzimidazolone, pyrazolone, perinone, azomethine, anthraquinone, triarylcarbonium, thioindigo, isoindoline, including substitutions of the general chemical structures of the foregoing, inorganic mixed metal and / or mixed metal oxide red color pigments, and blends thereof. 17. The latex or latex article of any one of embodiments 10 to 16, wherein the red color absorption pigment (b) is selected from the group consisting of Pigment Red 122, Pigment Red 202, Pigment red 188, Pigment Red 269, Pigment Red 254, Pigment Red 57:1, Pigment Red 48:2, Pigment Violet 23, and blends thereof. 18. The latex or latex article of any one of embodiments 10 to 17, wherein the latex is selected from the group consisting of natural rubber latex and / or synthetic rubber latex. 19. The latex or latex article of any one of embodiments 10 to 18, wherein the latex article is selected from the group consisting of balloons, gloves, preferably selected from the group consisting of rubber household gloves and medical gloves, condoms and diaphragms, beach toys, catheters, dental products, preferably selected from the group consisting of wedges and orthodontic rubber bands, and elastic for clothing. 20. The latex or latex article of any one of embodiments 10 to 19, wherein the red metallic surface finish comprising one or more metallic fillers (a) comprising metal and / or metal oxide particles and one or more red, violet and / or orange color absorption pigment particles (b) is part of a printing ink employed for giving the latex or latex article the red metallic surface finish 21. A process for producing the latex article of any one of embodiments 10 to 20 having a red metallic surface finish, comprising mixing a liquid dispersion natural and / or synthetic latex with the red metallic surface finish comprising one or more metallic fillers (a) comprising metal and / or metal oxide particles and one or more red, violet and / or orange color absorption pigment particles (b), and forming a latex article from the mixture, so that the red metallic surface finish is imbedded in the latex article at least in the surface thereof and has a red metallic effect, or first forming a latex article from a liquid dispersion natural and / or synthetic latex and thereafter coating the dried article with a mixture of a liquid dispersion natural / and / or synthetic latex with the red metallic surface finish comprising one or Sun Chemical Corporation C-1326 CE17216PC 14 more metallic fillers (a) comprising metal and / or metal oxide particles and one or more red, violet and / or orange color absorption pigment particles (b), and forming a latex coating from the mixture on the article, so that the red metallic surface finish is imbedded in the latex article at least in the surface thereof and has a red metallic effect. 22. The process of embodiment 21, wherein the latex and / or the mixture contain water and one or more adjuvants, selected from the group consisting of non-silicone defoamer, polyalkylene glycol, non-ionic surfactant, preferably alcohol ethoxylate, rheology modifier, preferably acrylic polymer and / or acrylic copolymer emulsion, preferably in water. 23. A red metallic latex article, obtainable or obtained by a process of embodiment 21 or 22. 24. A particle composition, comprising (a) one or more metallic filler particless comprising metal and / or metal oxide particles and (b) one or more red, violet and / or orange color absorption pigment particles, as defined in any one of embodiments 10 to 20, wherein the particle composition produces a red metallic surface finish in latex articles containing the pigment composition, at least in the surface thereof, wherein in the latex articles the metallic surface finish has a red metallic effect with the following characteristics: a* = 25-80 at 45° b* = 10-40 at 45° Flop Index (FI) according to Formula (1) of FI ≥ 9.0 in which L* 15, L* 110 and L* 45 are color measurements under the respective viewing angles and a*and b* are color dimensions of the Lab color space at 45°. 25. The use of a particle composition, comprising (a) one or more metallic fillers comprising metal and / or metal oxide particles and Sun Chemical Corporation C-1326 CE17216PC 15 (b) one or more red, violet and / or orange color absorption pigment particles, as defined in one of embodiments 10 to 20, as a red metallic surface finish for latex articles at least in the surface thereof, wherein in the latex articles the metallic surface finish has a red metallic effect with the following characteristics: a* = 25-80 at 45° b* = 10-40 at 45° Flop Index (FI) according to Formula (1) of FI ≥ 9.0 in which L* 15, L* 110 and L* 45 are color measurements under the respective viewing angles and a*and b* are color dimensions of the Lab color space at 45°. The particle (pigment) composition of the invention may be suitably dispersed with a polymeric dispersant to form a pigment dispersion. Accordingly, in a further aspect the invention relates to 26. A particle or pigment dispersion comprising a particle composition, as defined in embodiment 24, and a polymeric dispersant. It is also possible to add two or more polymeric dispersants. Suitable polymeric dispersants improve pigment dispersion and reduce interparticulate attraction within that dispersion. The improved dispersion means a small average particle size (or particle size reduction achieved in a shorter milling time) with a narrower particle size distribution. Dispersions are significantly more stable to flocculation and agglomeration than those produced by conventional means. Suitable polymeric dispersants possess a two-component structure comprising a polymeric chain and an anchoring group. The particular combination of these leads to their effectiveness. Sun Chemical Corporation C-1326 CE17216PC 16 The polymeric dispersant may be a statistical (for example, random), alternating, gradient, graft or block copolymer. The polymeric dispersant is generally added in an amount of from 1 to 50 wt%, preferably at most 35 wt% based on particles (a) and pigment (b) and optionally further pigments. Suitable polymeric dispersants copolymers are, for example, cationic copolymers, anionic copolymers, amphoteric copolymers, or non-ionic copolymers. Copolymers can have, for example, repeating units that are derived from polymerisable or polycondensable acids, esters, glycols, nitriles, amides, imides, olefins, epoxides or aziridines, such as acrylic or methacrylic acid or their esters, amides or nitriles, terephthalic acid esters, caprolactam, ethylene, propylene, isobutylene, styrene, ethylene oxide or ethyleneimine. Preferred are graft and block copolymers. As cationic, anionic, amphoteric or non-ionic copolymer there may be used those, for example, available under the trade name Disperbyk®111, 160, 161, 162, 163, 164, 166, 170, 171, 182, 2000, 2001, 2070, 2150, 2163; EFKA®PX 4300, PX 4310, PX 4320, PX 4330, PX 4340, PX 4350, PA 4400, PA 4401, PA 4402, PA 4403, PA 4450, PX 4700, PX 4701, PX 4731, PX 4732, Dispex®Ultra 4585, Solsperse®24000, 32550, Ajisper®PB-821, PB-822, PB-823 and combinations thereof. The polymeric dispersant usually affects the viscosity of the pigment dispersion. Preference is therefore given to using a polymeric dispersant which result in the Particle / pigment dispersion having a low viscosity, for example amphoteric or, especially, cationic copolymers. The particle or pigment dispersion may be prepared by a variety of methods. For example, the pigment composition, a solvent and the polymeric dispersant and optionally a further pigment synergist, may be dispersed in predetermined amounts through a dispersion step. The dispersion step may be carried out using a paint conditioner, sand grinder, ball mill, roll mill, stone mill, jet mill or homogenizer. If present, further colorants may also be added. If desired, other suitable additives or a binder resin of the composition to be used for final applications may be present during Sun Chemical Corporation C-1326 CE17216PC 17 dispersion step. The binder resin may be added partially or completely. Dispersion time may be suitably adjusted corresponding to the equipment used. Dispersion temperature can be varied, for example from 0°C or more, at room temperature or up to 100 °C. The particle / pigment composition or the particle / pigment dispersion of the invention may be used in various applications, for example for coloring any organic material of natural or synthetic origin, for example, a photosensitive resist formulation for manufacturing a color filter, a printing ink, a liquid ink, a coating composition, a paint, plastics, a film or a fiber. Accordingly, in a further aspect the invention relates to: 27. The use of a particle composition, as defined in embodiments 24, or of a particle or pigment dispersion as defined in embodiments 26 for coloring a photosensitive resist formulation for manufacturing a color filter, a printing ink, a liquid ink, a coating composition, a paint, plastics, a film or a fiber. Based on the organic material to be colored the particle / pigment composition is usually used in an amount of from 0.01 to 30 wt%. The present invention has been described in detail, including various embodiments thereof. However, it will be appreciated that those skilled in the art, upon consideration of the present disclosure, may make modifications and / or improvements on this invention that fall within the scope and spirit of the invention. EXAMPLES The invention is further described by the following non-limiting examples which further illustrate the invention, and are not intended, nor should they be interpreted to, limit the scope of the invention. The following compositions were used in the examples: Compal WS4468 (Al 88.0%): D5015μm PR122 dispersion Sunsperse QPD0122 (40.2wt.% PR122) Sun Chemical Corporation C-1326 CE17216PC 18 PR269 dispersion RPD-2690 (37.61wt.% PR269 PR57:1 dispersion RFD-9587 (38.0wt.% PR57:1) PR254 dispersion RFD-0254 (48.10wt.% PR254) PV23 dispersion VFD-1157 (46.90wt.% PV23) Compal WS4468 metallic effect pigment (SunChemical) (Al 88.0%) All of the following examples are prepared stepwise as described. Inventive Example 1 - Dispersion & Latex solution 1. Weigh PALIOCROM GOLD L2024 (non-volatiles (NV) = 60.0%) 502.4g; non- silicone defoamer 136.7g; polypropylene glycol 23.9g; deionized (DI) water 215.3g; and alcohol ethoxylate non-ionic surfactant 17.9g in 2L beaker and stir for 30 min. 2. Add acrylic emulsion 102.53 and stir for 30 min 3. In a separate vessel, weigh natural latex 89.3g; rheology modifier (acrylic copolymer emulsion in water) 0.7g; and Paliocrom dispersion 10.0g (from step 1) and stir for 30min. 4. To the #3 mixture, add PR122 dispersion Sunsperse QPD0122 (40.2wt.% PR122) in the amounts shown in Table 2. Mix at 3000RPM for 3min by Speed Mixer DAC 150 FVZ-K (Flack Tec., Inc) to provide the final mixture. Inventive Example 2 - Dispersion & Latex solution 1. Weigh PALIOCROM GOLD L2024 (NV 60.0%) 502.4g; non-silicone defoamer 136.7g; polypropylene glycol 23.9g; DI water 215.3g; and alcohol ethoxylate non- ionic surfactant 17.9g in 2L beaker and stir for 30 min. 2. Add acrylic emulsion 102.53 and stir for 30 min. 3. In a separate vessel, weigh latex 89.3g; rheology modifier (acrylic copolymer emulsion in water) 0.7g; and Paliocrom dispersion 10.0g (from step 1) and stir for 30min. 4. To the #3 mixture, add PR269 dispersion RPD-2690 (37.61wt.% PR269) in the amounts shown in Table 2. 5. Mix at 3000RPM for 3min by Speed Mixer DAC 150 FVZ-K (Flack Tec., Inc) to provide the final mixture. Sun Chemical Corporation C-1326 CE17216PC 19 Inventive Example 3 - Dispersion & Latex solution 1. Weigh PALIOCROM GOLD L2024 (NV 60.0%) 502.4g, non-silicone defoamer 136.7g; polypropylene glycol 23.9g; DI water 215.3g and alcohol ethoxylate non- ionic surfactant 17.9g in 2L beaker and stir for 30 min. 2. Add Acrylic emulsion 102.53 and stir for 30 min. 3. In a separate vessel, weigh natural latex 89.3g; rheology modifier (acrylic copolymer emulsion in water) 0.7g; and Paliocrom dispersion 10.0g (from step 1) and stir for 30 min. 4. Add PR57:1 dispersion RFD-9587 (38.0wt.% PR57:1) in the amounts shown in Table 2. 5. Mix at 3000RPM for 3min by Speed Mixer DAC 150 FVZ-K (Flack Tec., Inc) to provide the final mixture. Inventive Example 4 - Dispersion & Latex solution 1. Weigh PALIOCROM GOLD L2024 (NV 60.0%) 502.4g; non-silicone defoamer 136.7g; polypropylene glycol 23.9g; DI water 215.3g; and alcohol ethoxylate non- ionic surfactant 17.9g in 2L beaker and stir for 30 min. 2. Add acrylic emulsion 102.53 and stir for 30min. 3. In a separate vessel, weigh natural latex 89.3g; rheology modifier (acrylic copolymer emulsion in water) 0.7g; and Paliocrom dispersion 10.0g (from step 1) and stir for 30min. 4. To the #3 mixture, add PR254 dispersion RFD-0254 (48.10wt.% PR254) in the amounts shown in Table 2. 5. Mix at 3000RPM for 3min by Speed Mixer DAC 150 FVZ-K (Flack Tec., Inc) to provide the final mixture. Inventive Example 5 - Dispersion & Latex solution 1. Weigh PALIOCROM GOLD L2158 (NV 72.5%) 415.8g; non-silicone defoamer 136.7g; polypropylene glycol 32.6g; DI water 293.3g; and alcohol ethoxylate non- ionic surfactant 17.9g in 2L beaker and stir for 30 min. 2. Add Acrylic emulsion 102.53g and stir for 30min. Sun Chemical Corporation C-1326 CE17216PC 20 3. In a separate vessel, weigh natural latex 89.3g; rheology modifier (acrylic copolymer emulsion in water) 0.7g; and Paliocrom dispersion 3.1g (from step 1) and stir for 30min. 4. To the #3 mixture, add PR57:1 dispersion RFD-9587 (38.0wt.% PR57:1) in the amounts shown in Table 2. 5. Mix at 3000RPM for 3min by Speed Mixer DAC 150 FVZ-K (Flack Tec., Inc) to provide the final mixture. Inventive Example 6 - Dispersion & Latex solution 1. Weigh PALIOCROM GOLD L2158(NV 72.5%) 415.8g; non-silicone defoamer 136.7g; polypropylene glycol 32.6g; DI water 293.3g; and alcohol ethoxylate non- ionic surfactant 17.9g in 2L beaker and stir for 30 min. 2. Add Acrylic emulsion 102.53g and stir for 30min. 3. In a separate vessel, weigh natural latex 89.3g; rheology modifier (acrylic copolymer emulsion in water) 0.7g; and Paliocrom dispersion 3.1g (from step 1) and stir for 30min. 4. To the #3 mixture, add PR269 dispersion RPD-2690 (37.61 wt% PR269) in the amounts shown in Table 2. 5. Mix at 3000RPM for 3min by Speed Mixer DAC 150 FVZ-K (Flack Tec., Inc) to provide the final mixture. Inventive Example 7 - Dispersion & Latex solution 1. Weigh PALIOCROM GOLD L2158 (NV 72.5%) 415.8g; non-silicone defoamer 136.7g; polypropylene glycol 32.6g; DI water 293.3g; and alcohol ethoxylate non- ionic surfactant 17.9g in 2L beaker and stir for 30 min. 2. Add acrylic emulsion 102.53g and stir for 30min. 3. In a separate vessel, weigh natural latex 89.3g; rheology modifier (acrylic copolymer emulsion in water) 0.7g; and Paliocrom dispersion 10.0g (from step 1) and stir for 30min. 4. To the #3 mixture, add PR122 dispersion QPD-0122 (40.2 wt% PR-122) in the amounts shown in Table 2. 5. Mix at 3000RPM for 3min by Speed Mixer DAC 150 FVZ-K (Flack Tec., Inc) to provide the final mixture. Sun Chemical Corporation C-1326 CE17216PC 21 Inventive Example 8 - Dispersion & Latex solution 1. Weigh PALIOCROM GOLD L2158 (NV 72.5%) 415.8g; non-silicone defoamer 136.7g; polypropylene glycol 32.6g; DI water 293.3g; and alcohol ethoxylate non- ionic surfactant 17.9g in 2L beaker and stir for 30 min. 2. Add Acrylic emulsion 102.53g and stir for 30min. 3. In a separate vessel, weigh natural latex 89.3g; rheology modifier (acrylic copolymer emulsion in water) 0.7g; and Paliocrom dispersion 10.0g (from step 1) and stir for 30min. 4. To the #3 mixture, add PR57:1 dispersion RFD-9587 (38.0wt. % PR57:1) in the amounts shown in Table 2. 5. Mix at 3000RPM for 3min by Speed Mixer DAC 150 FVZ-K (Flack Tec., Inc) to provide the final mixture. Inventive Example 9 - Dispersion & Latex solution 1. Weigh PALIOCROM GOLD L2158(NV 72.5%) 415.8g; non-silicone defoamer 136.7g; polypropylene glycol 32.6g; DI water 293.3g; and alcohol ethoxylate non- ionic surfactant 17.9g in 2L beaker and stir for 30 min. 2. Add Acrylic emulsion 102.53g and stir for 30min. 3. In a separate vessel, weigh natural latex 89.3g; rheology modifier (acrylic copolymer emulsion in water) 0.7g; and Paliocrom dispersion 10.0g (from step 1) and stir for 30min. 4. To the #3 mixture, add PR269 dispersion RPD-2690 (37.61wt.% PR269) in the amounts shown in Table 2. 5. Mix at 3000RPM for 3min by Speed Mixer DAC 150 FVZ-K (Flack Tec., Inc) to provide the final mixture. Inventive Example 10 - Dispersion & Latex solution 1. Weigh PALIOCROM GOLD L2158 (NV 72.5%) 415.8g; non-silicone defoamer 136.7g; polypropylene glycol 32.6g; DI water 293.3g; and alcohol ethoxylate non- ionic surfactant 17.9g in 2L beaker and stir for 30 min. 2. Add Acrylic emulsion 102.53g and stir for 30min. Sun Chemical Corporation C-1326 CE17216PC 22 3. In a separate vessel, weigh natural latex 53.6g; rheology modifier (acrylic copolymer emulsion in water) 0.4g; and Paliocrom dispersion 10.8g (from step 1) and stir for 30min. 4. To the #3 mixture, add PR57:1 dispersion RFD-9587 (38.0wt.% PR57:1) in the amounts shown in Table 2. 5. Mix at 3000RPM for 3min by Speed Mixer DAC 150 FVZ-K (Flack Tec., Inc) to provide the final mixture. Inventive Example 11 - Dispersion & Latex solution 1. Weigh PALIOCROM GOLD L2158(NV 72.5%) 415.8g; non-silicone defoamer 136.7g; polypropylene glycol 32.6g; DI water 293.3g; and alcohol ethoxylate non- ionic surfactant 17.9g in 2L beaker and stir for 30 min. 2. Add Acrylic emulsion 102.53g and stir for 30min. 3. In a separate vessel, weigh natural latex 53.6g; rheology modifier (acrylic copolymer emulsion in water) 0.4g; and Paliocrom dispersion 10.8g (from step 1) and stir for 30min. 4. To the #3 mixture, add PR269 dispersion RPD-2690 (37.61wt.% PR269) in the amounts shown in Table 2. 5. Mix at 3000RPM for 3min by Speed Mixer DAC 150 FVZ-K (Flack Tec., Inc) to provide the final mixture. Inventive Example 12 - Dispersion & Latex solution 1. Weigh PALIOCROM RED L3258 (NV 74.3%) 405.7g; non-silicone defoamer 136.7g; polypropylene glycol 41.2g; DI water 302.3g; and alcohol ethoxylate non- ionic surfactant 17.9g in 2L beaker and stir for 30 min 2. Add acrylic emulsion 102.53 and stir for 30min. 3. In a separate vessel, weigh natural latex 89.3g; rheology modifier (acrylic copolymer emulsion in water) 0.7g; and Paliocrom dispersion 3.1g (from step 1) and stir for 30min. 4. To the #3 mixture, add PR57:1 dispersion RFD-9587 (38.0wt. % PR57:1) in the amounts shown in Table 2. 5. Mix at 3000RPM for 3min by Speed Mixer DAC 150 FVZ-K (Flack Tec., Inc) to provide the final mixture. Sun Chemical Corporation C-1326 CE17216PC 23 Inventive Example 13 - Dispersion & Latex solution 1. Weigh PALIOCROM RED L3258 (NV 74.3%) 405.7g; non-silicone defoamer 136.7g; polypropylene glycol 41.2g; DI water 302.3g; and alcohol ethoxylate non- ionic surfactant 17.9g in 2L beaker and stir for 30 min. 2. Add acrylic emulsion 102.53 and stir for 30min. 3. In a separate vessel, weigh natural latex 89.3g; rheology modifier (acrylic copolymer emulsion in water) 0.7g; and Paliocrom dispersion 3.1g (from step 1) and stir for 30min. 4. To the #3 mixture, add PR269 dispersion RPD-2690 (37.61wt.% PR269) in the amounts shown in Table 2. 5. Mix at 3000RPM for 3min by Speed Mixer DAC 150 FVZ-K (Flack Tec., Inc) to provide the final mixture. Inventive Example 14 - Dispersion & Latex solution 1. Weigh PALIOCROM RED L3258 (NV 74.3%) 405.7g; non-silicone defoamer 136.7g; polypropylene glycol 41.2g; DI water 302.3g; and alcohol ethoxylate non- ionic surfactant 17.9g in 2L beaker and stir for 30 min. 2. Add acrylic emulsion 102.53 and stir for 30min. 3. In a separate vessel, weigh natural latex 89.3g; rheology modifier (acrylic copolymer emulsion in water) 0.7g; and Paliocrom dispersion 10.0g (from step 1) and stir for 30min. 4. To the #3 mixture, add PR122 dispersion QPD-0122 (40.2wt.% PR122) in the amounts shown in Table 2. 5. Mix at 3000RPM for 3 min by Speed Mixer DAC 150 FVZ-K (Flack Tec., Inc) to provide the final mixture. Inventive Example 15 - Dispersion & Latex solution 1. Weigh PALIOCROM RED L3258 (NV 74.3%) 405.7g; non-silicone defoamer 136.7g; polypropylene glycol 41.2g; DI water 302.3g; and alcohol ethoxylate non- ionic surfactant 17.9g in 2L beaker and stir for 30 min. 2. Add acrylic emulsion 102.53 and stir for 30min. Sun Chemical Corporation C-1326 CE17216PC 24 3. In a separate vessel, weigh natural latex 89.3g; rheology modifier (acrylic copolymer emulsion in water) 0.7g; and Paliocrom dispersion 10.0g (from step 1) and stir for 30min. 4. To the #3 mixture, add PR269 dispersion RPD-2690 (37.61wt.% PR269) in the amounts shown in Table 2. 5. Mix at 3000RPM for 3min by Speed Mixer DAC 150 FVZ-K (Flack Tec., Inc) to provide the final mixture. Inventive Example 16 - Dispersion & Latex solution 1. Weigh PALIOCROM RED L3258 (NV 74.3%) 405.7g; non-silicone defoamer 136.7g; polypropylene glycol 41.2g; DI water 302.3g; and alcohol ethoxylate non- ionic surfactant 17.9g in 2L beaker and stir for 30 min 2. Add acrylic emulsion 102.53 and stir for 30min. 3. In a separate vessel, weigh natural latex 89.3g; rheology modifier (acrylic copolymer emulsion in water) 0.7g; and Paliocrom dispersion 10.0g (from step 1) and stir for 30min. 4. To the #3 mixture, add PR57:1 dispersion RFD-9587 (38.0wt.% PR57:1) in the amounts shown in Table 2. 5. Mix at 3000RPM for 3min by Speed Mixer DAC 150 FVZ-K (Flack Tec., Inc) to provide the final mixture. Inventive Example 17 - Dispersion & Latex solution 1. Weigh PALIOCROM RED L3258 (NV 74.3%) 405.7g; non-silicone defoamer 136.7g; polypropylene glycol 41.2g; DI water 302.3g; and alcohol ethoxylate non- ionic surfactant 17.9g in 2L beaker and stir for 30 min. 2. Add acrylic emulsion 102.53 and stir for 30min. 3. In a separate vessel, weigh natural latex 89.3g; rheology modifier (acrylic copolymer emulsion in water) 0.7g; and Paliocrom dispersion 10.0g (from step 1) and stir for 30min. 4. To the #3 mixture, add PR254 dispersion RFD-0254 (48.10wt.% PR254) in the amounts shown in Table 2. 5. Mix at 3000RPM for 3min by Speed Mixer DAC 150 FVZ-K (Flack Tec., Inc) to provide the final mixture. Sun Chemical Corporation C-1326 CE17216PC 25 Inventive Example 18 - Dispersion & Latex solution 1. Weigh PALIOCROM RED L3258 (NV 74.3%) 405.7g; non-silicone defoamer 136.7g; polypropylene glycol 41.2g; DI water 302.3g; and alcohol ethoxylate non- ionic surfactant 17.9g in 2L beaker and stir for 30 min. 2. Add acrylic emulsion 102.53 and stir for 30min. 3. In a separate vessel, weigh natural latex 89.3g; rheology modifier (acrylic copolymer emulsion in water) 0.7g; and Paliocrom dispersion 10.0g (from step 1) and stir for 30min. 4. To the #3 mixture, add PV23 dispersion VFD-1157 (46.90wt.% PV23) in the amounts shown in Table 2. 5. Mix at 3000RPM for 3min by Speed Mixer DAC 150 FVZ-K (Flack Tec., Inc) to provide the final mixture. Inventive Example 19 - Dispersion & Latex solution 1. Weigh PALIOCROM RED L3258 (NV 74.3%) 405.7g; non-silicone defoamer 136.7g; polypropylene glycol 32.6g; DI water 293.3g; and alcohol ethoxylate non- ionic surfactant 17.9g in 2L beaker and stir for 30 min. 2. Add acrylic emulsion 102.53g and stir for 30min. 3. In a separate vessel, weigh natural latex 53.6g; rheology modifier (acrylic copolymer emulsion in water) 0.4g; and Paliocrom dispersion 10.8g (from step 1) and stir for 30min. 4. To the #3 mixture, add PR122 dispersion QPD-0122 (40.2wt.% PR122) in the amounts shown in Table 2. 5. Mix at 3000RPM for 3min by Speed Mixer DAC 150 FVZ-K (Flack Tec., Inc) to provide the final mixture. Inventive Example 20 - Dispersion & Latex solution 1. Weigh PALIOCROM RED L3258 (NV 74.3%) 405.7g; non-silicone defoamer 136.7g; polypropylene glycol 32.6g; DI water 293.3g; and alcohol ethoxylate non- ionic surfactant 17.9g in 2L beaker and stir for 30 min. 2. Add Acrylic emulsion 102.53g and stir for 30min. Sun Chemical Corporation C-1326 CE17216PC 26 3. In a separate vessel, weigh natural latex 53.6g; rheology modifier (acrylic copolymer emulsion in water) 0.4g; and Paliocrom dispersion 10.8g (from step 1) and stir for 30min. 4. To the #3 mixture, add PR269 dispersion RPD-2690 (37.61wt.% PR269) in the amounts shown in Table 2. 5. Mix at 3000RPM for 3min by Speed Mixer DAC 150 FVZ-K (Flack Tec., Inc) to provide the final mixture. Inventive Example 21 - Dispersion & Latex solution 1. Weigh SunMICA gold 284-1219 301.4g; non-silicone defoamer 136.7g; polypropylene glycol 44.0g; DI water 396.2g; and alcohol ethoxylate non-ionic surfactant 17.9g in 2L beaker and stir for 30 min. 2. Add Acrylic emulsion 102.53g and stir for 30min. 3. In a separate vessel, weigh natural latex 89.3g; rheology modifier (acrylic copolymer emulsion in water) 0.7g; and SunMICA dispersion 10.0g (from step 1) and stir for 30min. 4. To the #3 mixture, add PR122 dispersion QPD-0122 (40.2wt.% PR122) in the amounts shown in Table 2. 5. Mix at 3000RPM for 3min by Speed Mixer DAC 150 FVZ-K (Flack Tec., Inc) to provide the final mixture. Inventive Example 22 - Dispersion & Latex solution 1. Weigh SunMICA gold 284-1219 301.4g; non-silicone defoamer 136.7g, polypropylene glycol 44.0g; DI water 396.2g; and alcohol ethoxylate non-ionic surfactant 17.9g in 2L beaker and stir for 30 min. 2. Add Acrylic emulsion 102.53g and stir for 30min. 3. In a separate vessel, weigh natural latex 89.3g; rheology modifier (acrylic copolymer emulsion in water) 0.7g; and SunMICA dispersion 10.0g (from step 1) and stir for 30min. 4. To the #3 mixture, add PR269 dispersion RPD-2690 (37.61wt.% PR269) in the amounts shown in Table 2. 5. Mix at 3000RPM for 3min by Speed Mixer DAC 150 FVZ-K (Flack Tec., Inc) to provide the final mixture. Sun Chemical Corporation C-1326 CE17216PC 27 Comparative Example 23 - Dispersion & Latex solution (does not contain iron oxide) 1. Weigh Compal WS4468 metallic effect pigment (SunChemical) (Al 88.0%) 25.0g; and DI water 50.0g in 100ml beaker and stir for 30 min. 2. pH adjusted 9.2 using a buffer system. 3. In a separate vessel, weigh natural latex 78.6g; rheology modifier (acrylic copolymer emulsion in water) 10.0g; and premix Compal WS446810.5g (from step 1) and stir for 30min. 4. To the #3 mixture, add PR122 dispersion QPD-0122 (40.2wt.% PR122) in the amounts shown in Table 3. 5. Mix at 3000RPM for 3min by Speed Mixer DAC 150 FVZ-K (Flack Tec., Inc) to provide the final mixture. Comparative Example 24 - Dispersion & Latex solution (does not contain iron oxide) 1. Weigh Compal WS4468(Al 88.0%) 25.0g; and DI water 50.0g in 100ml beaker and stir for 30 min. 2. pH adjusted 9.2 using a buffer system. 3. In a separate vessel, weigh natural latex 78.6g; rheology modifier (acrylic copolymer emulsion in water) 10.0g; and premix Compal WS446810.5g (from step 1) and stir for 30min. 4. To the #3 mixture, add PR269 dispersion RPD-2690 (37.6wt.% PR269) in the amounts shown in Table 3. 5. Mix at 3000RPM for 3min by Speed Mixer DAC 150 FVZ-K (Flack Tec., Inc) to provide the final mixture. Comparative Example 25 - Dispersion & Latex solution (does not contain iron oxide) 1. Weigh Compal WS4468 (Al 88.0%) 25.0g; and DI water 50.0g in 100ml beaker and stir for 30 min. 2. pH adjusted 9.2 using a buffer system. 3. In a separate vessel, weigh natural latex 78.6g; rheology modifier (acrylic copolymer emulsion in water) 10.0g; and premix Compal WS446810.5g (from step 1) and stir for 30min. Sun Chemical Corporation C-1326 CE17216PC 28 4. To the #3 mixture, add PR57:1 dispersion RFD-9587 (38.0wt.% PR57:1) in the amounts shown in Table 3. 5. Mix at 3000RPM for 3min by Speed Mixer DAC 150 FVZ-K (Flack Tec., Inc) to provide the final mixture. Comparative Example 26 - Dispersion & Latex solution (does not contain iron oxide) 1. Weigh Compal WS4468 (Al 88.0%) 25.0g; and DI water 50.0g in 100ml beaker and stir for 30 min. 2. pH adjusted 9.2 using a buffer system. 3. In a separate vessel, weigh natural latex 78.6g; rheology modifier (acrylic copolymer emulsion in water) 10.0g; and premix Compal WS446810.5g (from step 1) and stir for 30min. 4. To the #3 mixture, add PR254 dispersion RFD-0254 (48.1wt.% PR254) in the amounts shown in Table 3. 5. Mix at 3000RPM for 3min by Speed Mixer DAC 150 FVZ-K (Flack Tec., Inc) to provide the final mixture. Drawdowns of each example were made onto a primer coated aluminum panel (4×6 inches) using 25 mil applicator and baked for 30min at 80℃. Color measurement using BYK-mac i F-index (FI value). Calculate FI value following formula (1) Table 2: Color Measurements for Inventive (Inv.) Examples, employing Filler (a) and Pigment (b) wt. % Filler (a) Pigment (b) pigment FI a*45 b*45 (b)*Paliocrom Gold 0.77% 13.32 26.73 23.09 PR122 Inv. Ex.1 L2024 1.08% 12.8 29.05 22.1 Sun Chemical Corporation C-1326 CE17216PC 29 3wt% in Natural 2.09% 12.09 33.39 18.69 latex 2.61% 11.73 35.56 17.45 4.07% 10.71 36.53 14.7 5.03% 10.57 38.18 14.9 7.09% 9.81 38.73 13.71 0.72% 13.26 30.02 24.21 1.96% 11.84 36.52 23.83 PR269 Inv. Ex.2 3.80% 10.69 37.89 25.93 6.63% 10.25 39.21 28.59 0.20% 13.79 24.99 30.07 PR57:1 Inv. Ex.3 0.72% 12.76 32.2 26.15 2.01% 10.51 37.14 25.06 PR254 Inv. Ex.4 0.72% 9.38 30.93 33.66 Paliocrom Gold R57:1 Inv. Ex.5 0.63% 11.64 34.94 26.52 L2158 1wt% in Natural R269 Inv. Ex.6 0.48% 13.21 36.72 27.9 latex 0.40% 15.83 27.83 32.33 0.79% 14.96 31.91 27.95 PR122 Inv. Ex.7 2.28% 12.36 37 20.27 3.70% 11.1 38.69 17.96 Paliocrom Gold 0.17% 15.45 30.15 34.88 L2158 0.39% 14.89 33.47 33.08 3wt% in Natural PR57:1 Inv. Ex.8 0.79% 13.9 36.2 32.2 latex 2.16% 10.84 40.07 31.91 3.49% 9.38 40.91 30.51 0.37% 14.71 30.75 28.77 PR269 Inv. Ex. 2.13% 11.05 36.4 26.64 3.44% 10.16 37.35 28.05 Paliocrom Gold R57:1 Inv. Ex.10 3.45% 10.48 41.13 33.16 L2158 5wt% in Natural R269 Inv. Ex.11 3.41% 11.6 40.69 32.38 latex Paliocrom Red R57:1 Inv. Ex.12 0.93% 9.6 33.59 23.25 L3258 1wt% in Natural R269 Inv. Ex.13 0.75% 12.89 37.88 24.16 latex 0.09% 17.15 32.12 24.2 Paliocrom Red PR122 Inv. Ex.14 0.19% 17.06 32.98 22.63 L3258 0.44% 15.85 35.31 20.67 Sun Chemical Corporation C-1326 CE17216PC 30 3wt% in Natural 0.88% 14.46 36.72 17.96 latex 1.71% 13.1 37.43 15.21 0.08% 16.97 33.46 23.58 0.18% 16.79 34.76 22.95 PR269 Inv. Ex.15 0.42% 15.34 36.27 22.92 0.86% 13.72 37.83 24.7 1.59% 12.02 38.58 26.6 0.10% 11.27 36.49 25.23 0.20% 13.5 36.25 25.37 PR57:1 Inv. Ex.16 0.45% 15.17 36.1 25.75 0.87% 16.93 35.45 26.4 1.72% 17.41 34.62 27.25 0.10% 14.22 33.86 28.77 PR254 Inv. Ex.17 0.19% 12.43 35.72 29.77 0.44% 9.78 38.46 31.88 0.05% 17.81 28.3 19.73 PV23 Inv. Ex.18 0.17% 18.94 24.39 11.83 Paliocrom Red R57:1 Inv. Ex.19 0.76% 14.78 36.83 26.22 L3258 5wt% in Natural R269 Inv. Ex.20 0.77% 14.68 36.18 22.34 latex SunMICA Gold 0.18% 13.44 29.76 12.31 PR122 Inv. Ex.21 284-1219 2.06% 9.21 45.18 10.79 3wt% in Natural 0.18% 13.07 33.42 12.29 PR269 Inv. Ex.22 latex 0.73% 10.21 44.89 18.48 *wt.% red pigment refers to the amount of actual pigment in each example, not the amount of pigment dispersion (e.g. Inventive Example 1 at 0.77 wt.% red pigment requires 1.74 parts of Sunsperse QPD0122.40.2 x 1.74 = 0.77 red pigment) Table 2 shows that all inventive examples meet the red metallic color targets. Table 3: Color Measurements for Comparative (Comp.) Examples Filler wt. % PR Pigment (b)*FI a*45 b*45 comparative pigment 0.19% 13.52 4.07 -3.78 Aluminum 0.77% 14.06 12.23 -8.07 3wt% in Natural PR122 Comp. Ex.23 1.08% 13.98 15.45 -9.41 latex 2.11% 13.94 22.7 -11.85 Sun Chemical Corporation C-1326 CE17216PC 31 2.57% 13.54 25.47 -12.6 4.09% 13.49 31.11 -13.09 5.02% 13.31 33.54 -12.93 7.08% 12.64 38.09 -11.99 0.19% 13.79 5.3 -5.45 0.73% 14.11 16.97 -11.59 1.01% 13.97 21.67 -13.12 1.99% 13.52 31.26 -13.32 PR269 Comp. Ex.24 2.65% 12.93 34.83 -12.01 3.79% 12.49 40.5 -10.33 4.70% 11.99 40.89 -6.88 6.45% 12.08 42.54 -3.72 0.22% 13.64 10.88 -5.5 0.71% 13.76 18.99 -8.49 PR57:1 1.60% 13.36 26.63 -9.65 Comp. Example 25 2.94% 12.84 33.7 -8.41 5.06% 11.3 39.7 -4.14 0.25% 12.88 5.44 -1.1 0.87% 12.33 14.76 0.09 PR254 Comp. Ex.26 2.02% 11.17 25.37 3.73 3.70% 9.3 33.96 8.72 *wt.% red pigment refers to the amount of actual pigment in each example, not the amount of pigment dispersion (e.g. Inventive Example 1 at 0.77 wt.% red pigment requires 1.74 parts of Sunsperse QPD0122.40.2 x 1.74 = 0.77 red pigment) Table 3 shows that the comparative examples do not meet the red metallic color targets.

Claims

Sun Chemical Corporation C-1326 CE17216PC 32 CLAIMS 1. A latex or latex article having a red metallic surface finish, wherein the red metallic surface finish comprises (a) one or more metallic fillers comprising metal and / or metal oxide particles and (b) one or more red, violet and / or orange color absorption pigment particles, imbedded in the latex or latex article at least in the surface thereof, wherein the metallic surface finish has a red metallic effect with the following characteristics: a* = 25-80 at 45° b* = 10-40 at 45° Flop Index (FI) according to Formula (1) of FI ≥ 9.0in which L* 15, L* 110 and L* 45 are color measurements under the respective viewing angles and a*and b* are color dimensions of the Lab color space at 45°.

2. The latex or latex article of claim 1, wherein the metallic fillers (a) comprise one or more surface layers (a2) of metal and / or metal oxide.

3. The latex or latex article of claim 1 or 2, wherein the amount of metallic fillers (a) in the latex or latex article is 0.5 – 10 % by weight, based on the latex or latex article having the red metallic surface finish.

4. The latex or latex article of any one of claims 1 to 3, wherein the metallic filler (a) comprises a metal oxide, preferably selected from the group consisting of mica, glass, Al2O3, and / or a metal, preferably selected from the group consisting of aluminium, copper, silver, nickel, zinc, stainless steel or alloys of two or more of these metals, as substrate (a1).

5. The latex or latex article of claim 4, wherein the metallic filler (a) comprises one or more surface layers (a2), selected from the group consisting of one or more surface layers of metal or metal oxide different from iron oxide and / or one or more surfaceSun Chemical Corporation C-1326 CE17216PC 33 layers of iron oxide on the substrate (a1), wherein the metal and metal oxide are different from the metal and metal oxide of the substrate.

6. The latex or latex article of claim 5, wherein the metallic filler (a) comprises a weight amount of iron oxide in the surface layer (a2) that is 30-250 times the weight amount of metal and / or metal oxide substrate (a1).

7. The latex or latex article of any one of claims 1 to 6, wherein the red color absorption pigment (b) is selected from the group consisting of quinacridone, diketopyrolopyrollidone, azo red, azo orange, dioxazine, naphthol, diarylide, perylene, disazo orange, benzimidazolone, pyrazolone, perinone, azomethine, anthraquinone, triarylcarbonium, thioindigo, isoindoline, including substitutions of the general chemical structures of the foregoing, inorganic mixed metal and / or mixed metal oxide red color pigments, and blends thereof.

8. The latex or latex article of any one of claims 1 to 7, wherein the red color absorption pigment (b) is selected from the group consisting of Pigment Red 122, Pigment Red 202, Pigment red 188, Pigment Red 269, Pigment Red 254, Pigment Red 57:1, Pigment Red 48:2, Pigment Violet 23, and blends thereof.

9. The latex or latex article of any preceding claim, wherein the latex is selected from the group consisting of natural rubber laxtex and / or synthetic rubber latex.

10. The latex or latex article of any one of claims 1 to 9, wherein the latex article is selected from the group consisting of balloons, gloves, preferably selected from the group consisting of rubber household gloves and medical gloves, condoms and diaphragms, beach toys, catheters, dental products, preferably selected from the group consisting of wedges and orthodontic rubber bands, and elastic for clothing.

11. The latex or latex article of any one of claims 1 to 10, wherein the red metallic surface finish comprising one or more metallic fillers (a) comprising metal and / or metal oxide particles and one or more red, violet and / or orange color absorptionSun Chemical Corporation C-1326 CE17216PC 34 pigment particles (b) is part of a printing ink employed for giving the latex or latex article the red metallic surface finish.

12. A process for producing the latex article of any one of claims 1 to 11, having a red metallic surface finish, comprising the steps of mixing a liquid or fluid natural and / or synthetic latex with the red metallic surface finish comprising one or more metallic fillers (a) comprising metal and / or metal oxide particles and one or more red, violet and / or orange color absorption pigment particles (b), or with a particle composition containing (a) and (b), and forming a latex article from the so obtained mixture, so that the red metallic surface finish is imbedded in the latex article at least in the surface thereof and has a red metallic effect, or by first forming a latex article from a liquid or fluid natural and / or synthetic latex and thereafter coating the dried article with a mixture of a liquid or fluid natural and / or synthetic latex and the red metallic surface finish comprising one or more metallic fillers (a) comprising metal and / or metal oxide particles and one or more red, violet and / or orange color absorption pigment particles (b), or with a particle composition containing (a) and (b), and forming a latex coating from the mixture on the latex article, so that the red metallic surface finish is imbedded in the latex article in the surface thereof and has a red metallic effect.

13. The process of claim 12, wherein the liquid or fluid latex and / or the particle composition containing (a) and (b) contain water and one or more adjuvants, selected from the group consisting of non-silicone defoamer, polyalkylene glycol, non-ionic surfactant, preferably alcohol ethoxylate, rheology modifier, preferably acrylic polymer and / or acrylic copolymer emulsion, preferably in water.

14. A red metallic latex article, obtainable or obtained by a process of claim 12 or 13.

15. A particle composition, comprising (a) one or more metallic fillers comprising metal and / or metal oxide particles, as defined in any one of claims 1 to 11, andSun Chemical Corporation C-1326 CE17216PC 35 (b) one or more red, violet and / or orange color absorption pigment particles, as defined in any one of claims 1 to 11, wherein the particle composition produces a red metallic surface finish in latex articles containing the particle composition, at least in the surface thereof, wherein in the latex articles the metallic surface finish has a red metallic effect with the following characteristics: a* = 25-80 at 45° b* = 10-40 at 45° Flop Index (FI) according to Formula (1) of FI ≥ 9.0in which L* 15, L* 110 and L* 45 are color measurements under the respective viewing angles and a*and b* are color dimensions of the Lab color space at 45°.

16. The use of a particle composition, comprising (a) one or more metallic fillers comprising metal and / or metal oxide particles as defined in any one of claims 1 to 11, and (b) one or more red, violet and / or orange color absorption pigment particles, as defined in any one of claims 1 to 11, as a red metallic surface finish for latex articles at least in the surface thereof, wherein in the latex articles the metallic surface finish has a red metallic effect with the following characteristics: a* = 25-80 at 45° b* = 10-40 at 45° Flop Index (FI) according to Formula (1) of FI ≥ 9.0in which L* 15, L* 110 and L* 45 are color measurements under the respective viewing angles and a*and b* are color dimensions of the Lab color space at 45°.Sun Chemical Corporation C-1326 CE17216PC 36 17. A particle or pigment dispersion, comprising a particle composition as defined in claim 15, and further comprising a polymeric dispersant.

18. The use of a particle composition, as defined in claim 15, or of a particle or pigment dispersion as defined in claim 17, for coloring a photosensitive resist formulation for manufacturing a color filter, a printing ink, a liquid ink, a coating composition, a paint, plastics, a film or a fiber.

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