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US 6,150,306 AGranted
Fluorescent tracer dyes
AssigneeMorton Internatioanl Inc.
InventorMichael R. Friswell
Life of this patent
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Abstract
A dye composition has the formula: ##STR1## where R.sup.1 and R.sup.2 are the same or different and are selected from (A) C.sub.2 -C.sub.12 alkyloxyalkyl, and (B) C.sub.9-12 alkyl, (A) comprising from about 30 to 80 mole % of the R groups, (B) comprising 20 to about 70 mole % of the R groups. The dye composition is useful as a fluorescent tracer in refrigerant lubricants of the polyol ester types used in non-Freon refrigerants.
Claims5
A dye composition comprising a mixture of dye compounds having the formulae:
- ##STR5## wherein R.sup.1 and R.sup.2 are the same or different and are selected from (A) C.sub.2 -C.sub.12 alkyloxyalkyl, and (B) C.sub.9-12 alkyl, wherein from about 30 to 80 mole percent of the R.sup.1 and R.sup.2 groups in the composition are C.sub.2 -C.sub.12 alkyloxyalkyl and from about 20 to 70 mole percent of the R.sup.1 and R.sup.2 groups in the composition are C.sub.9 -C.sub.12 alkyl.
Dependencies are inferred from the claim text.