| abstract |
Mixtures of at least one diphosphinic acid of the formula (I) ** Formula wherein R 1, R 2 are the same or different and denote H, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, tert-butyl, butyl, n-pentyl, iso-pentyl, n-hexyl and / or iso-hexyl, R5 means ethylene, butylene, hexylene or octylene, with at least one alkylphosphinic acid of the formula (II) ** Formula ** where R3, R4 are the same or different and denote, independently of R1 and R2, ethyl, n-propyl, iso-propyl, n-butyl, isobutyl, tert-butyl, n-pentyl, iso-pentyl, n-hexyl and / or iso- hexyl, and the mixtures containing 0.1 to 99.9% by weight of diphosphinic acid of the formula (I), and 99.9 to 0.1% by weight of alkylphosphinic acid of the formula (II). |