| abstract |
The present invention relates to halogen-free, oligomeric or polymeric phosphonic acids made up of units of the general formula (I) n —[(O) m —{R 1 (X) n (Y) o } p R 1 (X) q ] r —[(O) s —R 5 (X) t ] v — (I), n where: n X is —P═O(OH) 2 , Y is carbonyl or sulfonyl, R 1 , R 5 are, independently of one another, divalent or polyvalent, substituted or unsubstituted, heteroatom-free or heteroatom- comprising aromatic radicals, m, o, s are each, independently of one another, 0 or 1, n, q, t are each, independently of one another, 0 or an integer from 1 to 8, with n and s not simultaneously being 0, r, v are each, independently of one another, from 0 to 1, with the sum of r and v being from 0.95 to 1.05, and p is 0 or an integer ≧1, nwhere the radicals X are substituents on R 1 and R 5 and the radicals Y are parts of polymer or oligomer chain, to a process for preparing these compounds and also to halogen-free mixtures comprising one or more compounds of the general formula (I) and a nitrogen-free solvent having a boiling point of >150° C. |