The present invention relates to weather-resistant pearlescent pigment, comprising a coated or uncoated platelet-shaped substrate which is selected from the group consisting of synthetic mica platelets, glass platelets, SiO.sub.2 platelets, Al.sub.2O.sub.3 platelets, synthetic boehmite platelets, BiOCl platelets and mixtures thereof, a chromophoric coating with at least one highly refractive metal oxide, and a top layer, wherein the top layer comprises the following layer sequence:
a) a first layer made of tin oxide and/or tin hydroxide and/or hydrated tin oxide, b) a second cerium-containing layer which comprises cerium oxide and/or cerium hydroxide and/or hydrated cerium oxide, c) an organic-chemical coating applied to the cerium-containing layer which contains oligomeric silanes or consists of them, wherein the oligomeric silanes have one or more amino groups and the oligomeric silanes are chemically bonded with the cerium-containing layer. The invention further relates to a process for the production and use of these pearlescent pigments.

The present invention relates to -Al.sub.2O.sub.3 flakes prepared by a process comprising (1) preparation of an aqueous solution of at least one water-soluble and/or insoluble aluminum salt which optionally contains at least one sulfate compound, (2) adding a basic solution and optionally at least one dopant to the aluminum salt solution (1), (3) drying of the obtained gel, followed by calcination to obtain Al2 03 flakes and alkali salts in a molten salt, and (4) removal of the water soluble parts of the calcined molten salt obtained in step (3).

Frits or frit mixtures with pearlescent pigments for materials, such as ceramic glazes, which are stable above 1000 C.

The present invention relates to pigments which comprise a substrate and an iron(II) silicate-containing coating applied thereto, to a process for the preparation of these pigments, and to the use thereof.

The present invention relates to a golden interference pigment which is suitable, in particular, for printing processes, to a process for the preparation of a pigment of this type, and to the use thereof.

The invention relates to a conductive elastomer provided and formed from a base elastomer and conductive solid particles that are distributed therein. The conductive particles used are: a) platelet-shaped conductive particles and/or b) dendritic conductive particles and/or c) other elongated conductive particles with a length:width ratio of greater than or equal to two. It has been seen that a combination of ball-shaped and platelet-shaped conductive particles is particularly advantageous. The particles can additionally be aligned by the pouring, application using a doctor blade, or drawing of the dissolved or not-yet cured mixture. The polymer is particularly suitable for medical electrodes for capturing and emitting signals. The material rennulus elastic, and conductive when stretched or bent.

A process for the production of flake-form, crystalline particles having an aurivillius structure, the use thereof as effect pigments or as substrates of effect pigments, furthermore, effect pigments which contain coated or uncoated flake-form, crystalline particles having an aurivillius structure as substrates, and the use thereof in various products.

Filler pigments based on platelet-shaped substrates, which are coated with barium sulfate and at least two metal oxides and/or metal hydroxides are highly suitable as filler pigments especially for cosmetic formulations.

A coating composition includes a binder component (A), a flake-like aluminum pigment (B) having an average particle diameter (d50) of 18 m to 25 m, and a flake-like pigment (C) being a flake-like pigment other than flake-like aluminum pigments and having an average particle diameter (d50) of 8 m to 30 m. A content of the flake-like aluminum pigment (B) is 10 parts by mass to 50 parts by mass and a content of the flake-like pigment (C) is 0.5 parts by mass to 10 parts by mass, based on 100 parts by mass of the binder component (A). A content ratio (B)/(C) of the flake-like aluminum pigment (B) to the flake-like pigment (C) is 2/1 to 50/1 in terms of a solid content mass ratio.

Pearlescent pigments with a superior flip flop effect which are based on defined Al.sub.2O.sub.3 flakes and the use thereof in paints, industrial coatings, automotive coatings, printing inks, cosmetic formulations and in particular as transparent substrate for effect pigments.