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MERCK PATENT GMBH

作者:ihpa.net 发布时间:2018-02-14

The present invention relates to pigments based on multicoated flake-form substrates which are distinguished by the fact that they have at least 8 layers on the surface, and to the use thereof, inter alia in paints, surface coatings, printing inks, plastics and in cosmetic formulations.

Multilayered pigments are employed as lustre or effect pigments in many areas of industry, in particular in decorative coating, in plastics, in paints, surface coatings, printing inks and in cosmetic formulations. Pigments which exhibit an angle-dependent colour change between a plurality of interference colours are, owing to their colour play, of particular interest for automotive paints, counterfeiting-proof documents of value and in decorative cosmetics. Interference pigments generally consist of flake-form supports which are coated with thin metal-oxide layers. The optical effect of these pigments is based on the directed reflection of light at the flakes, which are predominantly aligned in parallel. Reflection of the light at the interfaces of layers of different refractive index gives rise to interference colours (G. Pfaff in High Performance Pigments, Wiley-VCH Verlag, Weinheim, 2002, Chap. 7, Special Effect Pigments).

The prior art discloses processes for the preparation of multilayered pigments with the aid of which alternating layers of high and low refractive index can be applied to finely divided substrates. Pigments of this type based on multicoated flake-form substrates are known, for example, from U.S. Pat. No. 4,434,010, JP H7-759, U.S. Pat. No. 3,438,796, U.S. Pat. No. 5,135,812, DE 44 05 494, DE 44 37 753, DE 195 16 181 and DE 195 15 988, DE 196 18 565, DE 197 46 067 and from the literature, for example from EURO COSMETICS, 1999, No. 8, p. 284.

However, the multilayered pigments known from the prior art have the disadvantage that they are generally insufficiently opaque.

The object of the present invention is therefore to provide multilayered pigments which do not have the above-mentioned disadvantage.

Surprisingly, multilayered pigments based on flake-form substrates have now been found which exhibit significantly improved properties with respect to their colouristic properties, but also their applicational properties, in particular relatively high hiding power together with high reflectivity, compared with the multilayered pigments from the prior art. This has been achieved by internal structuring of at least 6 high-refractive-index layers on the substrate.

The invention therefore relates to multilayered pigments based on multi-coated flake-form substrates which have at least 8 layers [layers (A)-(H)] on the substrate, where an SiO2 layer (=layer A) is located directly on the surface of the substrate.

The multilayered pigments according to the invention are distinguished over the multilayered pigments from the prior art by

significantly increased luminance and thus high reflectivity,

higher gloss,

a very good skin-adhesion capacity,

a higher hiding power.

The pigments according to the invention are significantly superior to the multilayered pigments from the prior art not only with respect to their optical properties, such as gloss and colour strength, but also in their applicational properties, such as, for example, mechanical stability and photostability.

The invention furthermore relates to the use of the pigments according to the invention in paints, surface coatings, in particular automobile paints, powder coatings, printing inks, security printing inks, plastics, ceramic materials, glasses, paper, in toners for electrophotographic printing processes, in seed, in greenhouse sheeting and tarpaulins, as absorbers in the laser marking of paper and plastics, and in cosmetic formulations. The pigments according to the invention are furthermore also suitable for the preparation of pigment pastes with water, organic and/or aqueous solvents, pigment compositions and for the preparation of dry preparations, such as, for example, granules, chips, pellets, briquettes, etc. The dry preparations are particularly suitable for printing inks and in cosmetics.

Suitable base substrates for the pigments according to the invention are colourless or selectively or non-selectively absorbent flake-form substrates. Suitable substrates are, in particular, phyllosilicates, such as natural and/or synthetic mica, talc, kaolin, flake-form iron or aluminium oxides, glass flakes, SiO2 flakes, TiO2 flakes, graphite flakes, synthetic support-free flakes, titanium nitride, titanium silicide, liquid crystal polymers (LCPs), holographic pigments, BiOCl and flake-form mixed oxides, or mixtures thereof. Particularly preferred substrates are glass flakes, natural or synthetic mica flakes and Al2O3 flakes.

Particular preference is given to glass flakes owing to their particularly smooth surface and their very high reflection capacity.

Suitable glasses are all glasses known to the person skilled in the art, for example silicate glasses, such as soda-lime glass, borosilicate glass, aluminosilicate glass, lead crystal glass, E, A, C or ECR glass, Duran glass, window glass, laboratory glass, etc. Glasses of this type are produced from sand, lime, clay, boron compounds, potash, soda, etc. and allowed to solidify in a shaped state. Suitable glass flakes preferably consist of C, E, ECR or borosilicate glass. It is of course also possible to employ mixtures of different glass flakes which only differ in the glass composition. Particular preference is given to substrate flakes comprising calcium aluminium borosilicate or ECR glass.

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