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.
Claims20
A fluorinated dye comprising:
- a fluorescing coumarin-derived moiety connected to an oligomer of hexafluoropropylene oxide via a non-fluorinated divalent linking group.
A method for detecting leaks in a refrigeration system comprising (a) introducing a fluorinated dye comprising a fluorescing coumarin-derived moiety connected to an oligomer of hexafluoropropylene oxide via a non-fluorinated divalent linking group within a refrigeration system comprising a refrigerant composition comprising a fluorinated fluid, (b) operating the refrigeration system for a sufficient time to allow for thorough mixing of the fluorinated dye and the refrigerant composition;
- and (c) determining the presence of a leak in the refrigeration system by directing an ultraviolet light at the refrigeration system and subsequently detecting a fluorescing color.
Dependencies are inferred from the claim text.