Process for preparing electrically conductive pigments
AssigneeMerck Patentgesellschaft Mit Beschrankter Haftung
InventorRalf Glausch
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Abstract
The invention relates to a process for preparing electrically conductive pigments based on F−- and/or PO43−-doped tin mixed oxides applied as an electrically conductive layer to a substrate, in which, first of all, SnO2-coated substrates are prepared by precipitation and subsequent calcining and then, in further process steps, this SnO2 layer is converted into a tin mixed oxide layer doped with F− and/or PO43−. The invention further relates to electrically conductive pigments prepared by the process of the invention, to the use of these pigments for pigmenting lacquers, printing inks, plastics systems or coatings, and to lacquers, printing inks, plastics systems or coatings pigmented with an electrically conductive pigment prepared by the process of the invention.
Claims13
Process for preparing electrically conductive pigments based on F−- and/or PO43−-doped tin mixed oxides applied as an electrically conductive layer to a substrate, characterized
- in that, first of all, a substrate coated with tin(IV) oxide hydrate is prepared by adding a hydrolysable tin(IV) compound to an aqueous solution containing the substrate in suspended form, at a pH and temperature which permit complete hydrolysis of the tin(IV) compound, and this substrate is separated from the suspension and, if desired, washed and dried, and is subsequently calcined at a temperature between 600 and 1000° C. to form a substrate coated with SnO2, and
- in that, subsequently, in further process steps, this SnO2 layer is converted into a tin mixed oxide layer doped with F− and/or PO43−.
Dependencies are inferred from the claim text.