Process for the preparation of concentrated solutions of fluorin

Details Process for the preparation of concentrated solutions of fluorin Process for the preparation of concentrated solutions of fluorin

1975-09-22

1978-03-28

Evans, Joseph E.

Compositions

Preservative agents

Anti-corrosion

260534S, 260561S, 260609B, 260609R, B01F 1728

Patent

active

040813991

ABSTRACT:
The invention is directed to a process for the preparation of concentrated solutions of fluorinated surfactants of the formula ##STR1## wherein R.sub.f is a perfluoroalkyl or perfluoroalkoxy-perfluoroalkyl group, R.sup.1 is a branched or straight chain alkylene, alkylenethioalkylene, alkyleneoxy-alkylene or alkyleneiminoalkylene group, X is oxygen or an amino group, Q is an organic group containing at least one amino group and y is zero or 1, said process comprising (a) reacting an aqueous solution of an amine with an anhydride previously dissolved in an anhydrous water miscible organic solvent, dissolved in an anhydrous water miscible organic solvent, and (b) reacting the intermediate obtained from the first reaction with an R.sub.f -thiol in the presence of a non-reactive water miscible thiol solvent.

REFERENCES:
patent: 2368067 (1945-01-01), Lynch
patent: 3003954 (1961-10-01), Brown
patent: 3172910 (1965-03-01), Bruce
patent: 3211747 (1965-10-01), Johnson
patent: 3759981 (1973-09-01), Hager et al.
patent: 3833651 (1974-09-01), Ouchi et al.
patent: 3947493 (1976-03-01), Balme et al.
patent: 3950542 (1976-04-01), Kalopissis et al.
Riddick et al., "Organic Solvents", 3rd ed. (1970), also Techniques of Chemistry, vol. II, pp. 446, 447, 467, 460, 6.
Monick, "Alcohols", 1968, pp. 282, 283, 284, 285, 286, 306.

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