Patent ID: 8889772
Filing Date: 2014-11-18
Classification: C07F,C09K

Abstract:
1. A process for preparing mixtures of alkylphosphonous salts and dialkylphosphinic salts, comprising the steps of: a) reacting a phosphinic acid source (I) with ethylene in the presence of a catalyst A to give a mixture of alkylphosphonous acid (III) and dialkylphosphinic acid (IV) or salts or esters thereof where R b) reacting the mixture of alkylohosphonous acid (III) and dialkylphosphinic acid (IV) or salts or esters thereof with metal compounds of Mg, Ca, Al, Sb, Sn, Ge, Ti, Fe, Zr, Zn, Ce, Bi, Sr, Mn, Li, Na, K to give the mixtures of alkylphosphonous salt (V) and dialkylphosphinic salt (VI) of these metals, or a combination thereof where A and B are each ethyl and Y is Mg, Ca, Al, Sb, Sn, Ge, Ti, Fe, Zr, Zn, Ce, Bi, Sr, Mn, Li, Na, K, or a combination thereof and n is ¼, ⅓, ½, 1 and wherein the mixture of alkylphosphonous salt (V) and dialkylphosphinic salt (VI) comprises 3 to 30% by weight of alkylphosphonous salt (V) and 70 to 97% by weight of dialkylphosphinic salt (VI).