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US 3,941,560 AGranted
Trisazo polyester materials
AssigneeAmerican Aniline Products, Inc.
InventorsEdgar E. Renfrew, Dominic A. Zanella
Life of this patent
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Abstract
Polyester fibers, particularly poly(ethylene terephthalate), is dyed in bright, fast shades with p,p'"-dihydroxytrisazo compounds.
Claims6
A aromatic polyester fabric material dyed with a compound of the formula ##SPC10##
- wherein each of R.sub.1, R.sub.2, R.sub.7 and R.sub.8 is independently hydrogen, lower alkyl, lower alkoxy, hydroxy, chlorine or bromine;
- and
- each of R.sub.3, R.sub.4, R.sub.5 and R.sub.6 is independently hydrogen, lower alkyl, lower alkoxy, chlorine or bromine.
Dependencies are inferred from the claim text.