Hoechst Aktiengesellschaft

Richard Broll

Heinrich Bathelt

Wolfgang Muller

Erich Schuierer

Roland Muller

Eckhard Weber

Johann Daimer

Process for separating fullerenes

New aqueous concentrates containing a fluorinated surfactant and a further foam producing component are disclosed. They contain of from 0.5 to 2.5% by weight a fluorinated phosphorous acid ester having the formula ##STR1## In this formula means R.sub.f a perfluoroalkyl radical with from 3 to 16 carbon atoms, m zero or 1, p an integer of from 1 to 4, R.sub.1 a hydrogen atom, a C.sub.1-4 alkyl radical, a cylcohexyl radical or a 2-hydroxyalkyl radical with from 2 to 6 carbon atoms, R.sub.2 a C.sub.1-4 alkyl radical, a cyclohexyl radical or a 2-hydroxyalkyl radical with 2 to 6 carbon atoms, or a radical of the formula R.sub.f --(CF.dbd.CH).sub.m --(CH.sub.2).sub.p, Q an alkylene radical with 2 to 4 carbon atoms, which may be substituted by phenyl groups. The aqueous concentrate when diluted with about 16 parts by volume of water gives a solution which can be foamed. The foam it capable of extinguishing liquid hydrocarbon fires.

Fire extinguishing agent

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Langen, Germany

Richard Broll