Patent ID: 6534673
Filing Date: 2003-03-18
Classification: C07F

Abstract:
A process for preparing salts of dialkylphosphinic of acids, which comprisesa) reacting alkylphosphonous and/or hypophosphorous acid and/or alkali metal salts thereof with olefins, wherein the olefins are ethylene, n-propylene, isopropylene, u-butene, n-pentene, isopentene, n-hexene and/or isohexene, in the presence of a free-radical initiator, wherein the free radical initiator is an azo compound to give dialkylphosphinic acids and/or alkali metal salts thereof and b) reacting the dialkylphosphinic acids and/or alkali metal salts thereof obtained according to a) with metal compounds of Mg, Ca, Al, Sb, Sn, Ge, Ti, Zn, Fe, Zr, Ce, Bi, Sr, Mn, Li, Na and/or K to give the metal dialkylphosphinate salts.