Claims
- 1. 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)
- 2. The method according to claim 1, wherein the fluorescent dye based in pyrromethene difluoroborate complexes having the general formula (I) has been dissolved in octanoic acid.
- 3. The method according to claim 1, wherein the fluorescent dye based on pyrromethene difluoroborate complexes having the general formula (I) 4,4-difluoro-2,6-diethyl-1,3,5,7-tetramethyl-8-heptyl-4-bora-3a,4a-diaza-s-indacene is selected.
- 4. A fluorescent dye concentrate comprising at least one fluorescent dye based on pyrromethene difluoroborate complexes having the general formula (I)
- 5. The fluorescent dye concentrate according to claim 4, herein the concentration ratio of the fluorescent dye dissolved in octanoic acid is in the range from 150 g of the fluorescent dye in 100 g of octanoic acid to 350 g of the fluorescent dye in 100 g of octanoic acid.
- 6. The fluorescent dye concentrate according to claim 4, wherein the fluorescent dye based on pyrromethene difluoroborate complexes having the general formula (I) 4,4-difluoro-2,6-diethyl-1,3,5,7-tetramethyl-8-heptyl-4-bora-3a,4a-diaza-s-indacene is selected.
Priority Claims (1)
Number |
Date |
Country |
Kind |
101 42 121.4 |
Aug 2001 |
DE |
|
CROSS-REFERENCES TO RELATED APPLICATIONS
[0001] This application is a continuation of prior filed copending PCT International application No. PCT/EP02/09655, filed Aug. 29, 2002.
[0002] This application claims the priority of German Patent Application Serial No. 101 42 121.4, filed Aug. 30, 2001, pursuant to 35 U.S.C. 119(a)-(d), the subject matter of which is incorporated herein by reference.
Continuations (1)
|
Number |
Date |
Country |
Parent |
PCT/EP02/09655 |
Aug 2002 |
US |
Child |
10789419 |
Feb 2004 |
US |