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US 12,227,653 B2Granted
Fluorinated coumarins
Assignee3M Innovative Properties Company
InventorsNicholas L. Untiedt, Paul B. Armstrong, Patricia M. Savu, Phillip E. Tuma
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Abstract
Described herein is fluorinated dye comprising: a fluorescing coumarin-derived moiety connected to an oligomer of hexafluoropropylene oxide via a non-fluorinated divalent linking group. Such fluorinated dyes are soluble in fluorinated fluids and may be used to detect leaks in various systems such as refrigerant, air conditioning and/or heat transfer systems.
Claims12
A fluorinated dye comprising:
- a fluorescing coumarin-derived moiety connected to an oligomer of hexafluoropropylene oxide via a non-fluorinated divalent linking group, wherein the fluorinated dye is
- where R1 is H or methyl;
- Z is a —C(═O)— or —S(═O)2—;
- Rf is a perfluorinated alkyl group comprising 1 to 20 carbon atoms and optionally comprising at least one catenated in-chain oxygen atom;
- n is greater than 2;
- R2 is H or methyl, and OHFPO is an oligomer of hexafluoropropylene oxide connected together via ring opening of the oligomerization.
3 more elements
Dependencies are inferred from the claim text.