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US 2001/0012899 A1Published application
Oligomeric methine dyes
AssigneeClariant Finance (BVI) Limited
InventorJurgen Geiwiz
Life of this patent
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Abstract
Oligomeric methine dye compounds obtainable from a reaction of a diamine with the substances mentioned in the claims, a storage-stable formulation thereof, their use for dyeing organic substrates and substances dyed with such dyes.
Claims10
Compounds or their mixtures obtainable by a diamine being reacted
- in a first step with at least 2.5 equivalents of a compound containing two leaving groups or groups capable of N-alkylation,
- in a second reaction step with an aromatic N-containing heterocyclic compound or a nucleophilic compound or a mixture thereof,
- in a third reaction step with an aldehyde and finally admixed in a fourth reaction step with an inorganic or organic acid.
Dependencies are inferred from the claim text.