Dyestuffs for perfluoropolyoxyalkylenes and compositions based on perfluoropolyoxyalkylenes containing such dyestuffs
AssigneeAusimont S.p.A.
InventorsEzio Strepparola, Piero Gavezotti, Giovanni Gavazzi
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Abstract
1. Dyestuffs for cyclic or straight polyfluoropolyoxyalkylenes, of general formula: Q[B--(A).sub.s ].sub.t (III) or [(Q).sub.s --B].sub.2 A (IV) where: Q=an organic group containing a chromophore group, free from free or salified sulphonic and/or carboxylic groups, and/or sulphon-amidic groups; A=a perfluorooxyalkylene chain, which is monovalent in formula (II) and divalent in formula (III); B=an organic at least divalent group; s, t=1 or 2, respectively. 2. Compositions comprising cyclic or straight polyfluoropolyoxyalkylenes and at least a dyestuff of formula (III) or (IV) dissolved therein.
Claims3
A dyestuff for polyfluoropolyoxyalkylenes, said dyestuff having the formula:
- Q[B--(A).sub.S ].sub.t or [(Q).sub.S --B].sub.2 A
- wherein:
- Q is selected from the group consisting of azo, stilbene, diphenylmethane, triarylmethane, xanthen, acridine, quinoline, methine, polymethine, indamine, indophenol, azinic, oxazine, thiazine, and anthraquinone dyestuffs;
- A is a perfluoroxyalkylene polymer chain having perfluoroxyalkylene units having the formulas:
- ##STR38## where X=F or CF.sub.3, said perfluorooxyalkylene polymer chain having the formula:
- ##STR39## wherein said units are randomly arranged and wherein z=an integer from 1 to 3;
- m, n and p=integers ranging from 0 to 50, the sum of which is at least 2;
- k=1 when said dyestuff has the formula Q[B--(A).sub.s ].sub.t and 0 when said dyestuff has the formula [(Q).sub.s --B].sub.2 A, the average molecular weight of A ranging from 500 to 15,000;
- B is an organic group which is at least divalent;
- t=1 or 2;
- s=1 or 2.
Dependencies are inferred from the claim text.