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US 6,469,147 B2Granted
Preparation of azo colorants in microreactors
AssigneeClariant Finance (BVI) Limited
InventorsUwe Nickel, Rüdiger Jung, Klaus Saitmacher, Leonhard Unverdorben
Life of this patent
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Abstract
Azo colorants are prepared by conducting the diazotization of aromatic or hetaromatic amines or the azo coupling reaction or the diazotization and the azo coupling reaction in a microreactor.
Claims17
A process for preparing azo colorants, which comprises conducting one or more of a) diazotization of aromatic or hetaromatic amines, b) azo coupling, c) laking and d) metal complexing in a microreactor.
Dependencies are inferred from the claim text.