Dialkylphosphinic salts, their use, and a process for their preparation

A diorganylphosphinic salt of the formula (I) a diorganyldiphosphinic salt of the formula (II), a polymer of the diorganylphosphinic salt of the formula (I), a polymer of the diorganyldiphosphinic salt of the formula (II), or a mixture thereof

• where
• R1 and R2 are identical or different and are C1-C6-alkyl, linear or branched, or aryl;
• R3 is C1-C10-alkylene, linear or branched, C6-C10-arylene, -alkylaryiene, or -alkylarylene;
• M is Mg, Ca, Al, Sb, Sn, Ge, Ti, Fe, Zr, Zn, Ce, Bi, Sr, Mn, Li, Na, K, a protonated nitrogen base or a mixture thereof;
• m is from 1 to 4;
• n is from 1 to 4;
• x is from 1 to 4,
• wherein there is at least one partially water-soluble, ionizable compound, wherein the total content of at least one partially water-soluble, ionizable compound and the water-soluble content of the at least one partially water-soluble, ionizable compound is from 8200 to 100 ppm, wherein the at least one partially water-soluble, compound is a sulfate and wherein the total content of sulfate is from 3800 to 100 ppm, and the content of water-soluble sulfate is from 1200 to 10 ppm.