Methine dyes
AssigneeLANXESS Deutschland GmbH
InventorsSabine Schmauser, Sr., Frank Linke, Hans-Ulrich Borst
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Abstract
The present invention relates to novel methine dyes, methods for the preparation thereof and use thereof for dyeing plastics, especially polyamides, so as to obtain yellow to orange colourings with improved light fastness and improved thermal stability. Such dyes include a dye of the formula (I) in which R1 is hydrogen, halogen, COOH or COOR11, R2 is hydrogen, halogen, COOH, COOR12 or CN, R3 is alkyl or phenyl, R4 and R5 are each independently alkyl, R6, R7, R8, R9 and R19 are each independently hydrogen, halogen, alkyl, alkoxy or COOR13, and R11, R12 and R13 are each independently alkyl.
Claims15
A dye of the formula (I)
- in which
- R1 is COOCH3,
- R2 is hydrogen,
- R3 is methyl,
- R4 and R5 are each methyl, and
- R6, R7, R8, R9 and R10 are each independently hydrogen, methyl, methoxy, ethoxy or chlorine.
Dependencies are inferred from the claim text.