| 摘要 |
<p>1533430 Lustrous pigments MERCK PATENT GmbH 18 May 1976 [22 May 1975] 20491/76 Heading C4A Lustrous pigments consisting essentially of mica flakes coated with a plurality of metal oxide layers, the metal oxide layers being alternatingly arranged and comprising at least the succession rutile/stannic oxide/rutile, a layer of rutile with a thickness of at most 25 nm. lying on the mica may be produced by a process wherein mica flakes coated with a thin titanium dioxide hydrate layer are at least once first provided with a stannic oxide hydrate layer by deposition thereof from a stannous salt solution in the presence of an oxidation agent, followed by deposition of a titanium dioxide hydrate layer from a titanium salt solution, whereafter the product obtained is washed and calcined.</p> |
