Back to results
US 2004/0203159 A1Published application
Use of fluorescent dyes based on pyrromethene difluoroborate complexes for the fluorescent marking of lubricants and for the determination of leakages in lubricant systems and a corresponding fluorescent dye concentrate
AssigneeCertus Dur GmbH
InventorsChristoph Zander, Birgitt Zander, Rene Puschl
Life of this patent
Estimating the term…
Abstract
Use of fluorescent dyes based on pyrromethene difluoroborate complexes is disclosed for use in fluorescent marking of lubricants and fro the determination of leakages in lubricant systems and a corresponding fluorescent dye concentrate.
Claims6
A method for the detection of leakage in lubricant systems comprising the steps of:
- marking a lubricant with a fluorescent dye based on pyrromethene difluoroborate complexes having the general formula (I)
- 3
- where R1, R2, R3, R5, R6 and R7 are independently hydrogen or straight-hain or branched-chain C1-C4-alkyl radicals or the R1 and R2 and the R6 and R7 pairs are part of a fused aromatic ring system and R4 is a straight-chain or branched-chain C1-C10-alkyl radical, and detecting the fluorescence by detection means.
A fluorescent dye concentrate comprising at least one fluorescent dye based on pyrromethene difluoroborate complexes having the general formula (I)
- 4
- where R1, R2, R3, R5, R6 and R7 are independently hydrogen or straight-chain or branched-chain C1-C4-alkyl radicals or the R1 and R2 and the R6 and R7 pairs are part of a fused aromatic ring system and R4 is a straight-chain or branched-chain C1-C10 alkyl radical, and octanoic acid solvent.
Dependencies are inferred from the claim text.