Patent · US Active

Methine dyes

US11193023B2 · kind B2 · utility

0Cited by

4References

15Claims

0Family size

Assignee

LANXESS Deutschland GmbH · DE

Inventors

Sabine Schmauser, Sr. · Leverkusen, DE
Frank Linke · Recklinghausen, DE
Hans-Ulrich Borst · Elsdorf, DE

Key dates

Filing date	Oct 9, 2018
Grant date	Dec 7, 2021
Priority date	—
Expiry date	Nov 23, 2038

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08K5/0041
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

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 whichR1 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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.