| 简介 |
The invention relates to a method for producing dialkylphosphinic acid salts, characterised in that a) elemental yellow phosphor is reacted with alkyl halides in the presence of alkali or alkaline-earth hydroxide to form a mixture containing the salts of alkylphosphonous, phosphorous and hypophosphorous acids as the principal constituents; b) the mixture is adjusted to a pH of less than 7 and then reacted with olefins in the presence of a radical starter and c) the dialkylphosphinic acids and/or their alkali salts obtained according to b) are reacted with metal compounds of Mg, Ca, Al, Sb, Sn, Ge, Ti, Zn, Fe, Zr, Ce, Bi, Sr, Mn, Li, Na, and/or K to form dialkylphosphinic acid salts of the metals. The invention also relates to the use of the dialkylphosphinic acid salts of metals obtained according to the inventive method for producing flameproofing agents. |
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