Polymer composition comprising phosphonate flame retardant

A composition comprising a polymer material and a halogen-free flame retardant contained and/or bound therein in a quantity of 1 to 40% by weight in relation to the entire composition, wherein the flame retardant is a compound of the formula (I), its corresponding ammonium salt, its corresponding phosphonate salt or a mixture of the aforementioned:

• wherein
• (N-i) R1 and R2 are identical or different substituents and are selected from the group consisting of linear, branched, or cyclic alkyls, alkenyls and alkinyls, unsubstituted and alkyl-substituted phenyls, mononuclear and multinuclear aromatics with up to 4 nuclei, mononuclear or multinuclear heteroaromatics with up to 4 nuclei, silyls, allyl, alkyl, or aryl alcohols, or
• (N-ii) R1 and R2 together, including the N atom, form a saturated or monounsaturated or polyunsaturated heterocycle with 4-8 ring atoms, selected from carbon, oxygen, sulfur, phosphorus, silicon, and nitrogen,
• and wherein —X— is an oxygen atom, —O—, or —X— is a single bond, and
• wherein R3, R4, R5 and R6 are identical or different substituents and are selected from
• (P-i) the group consisting of H, linear, branched, or cyclic alkyls, alkenyls and alkinyls, unsubstituted and alkyl-substituted phenyls, multinuclear aromatics having up to 4 nuclei, mononuclear or multinuclear heteroaromatics having up to 4 nuclei, silyls, allyl, alkyl or aryl alcohols, of the following structures (III) and (IV), where n=0 to 100,
• and cations wherein the cation is Na+, K+, Mg2+, Ca2+, B3+, Al3+, Zn2+, NH4+ or the ammonium ion of an amine compound, selected from the group consisting of melamine or its condensation products, urea, guanidine, morpholine, and piperazine, and/or
• (P-ii) when —X— is an oxygen atom, —O—, —OR3 and —OR4 together and/or —OR5 and —OR6 together and/or —OR3 and —OR5 together and/or —OR4 and —OR6 together, including the P atom of the phosphonate group, form a cyclic phosphonic acid ester or a cyclic phosphonic acid anhydride having a ring size of 4-10 atoms, and/or
• (P-iii) when —X— is a single bond, —R3 and —OR4 and/or —R3 and —OR5 together, including the P atom of the phosphinate group, form a cyclic phosphinic acid ester or a cyclic phosphinic acid anhydride having a ring size of 4-10 atoms and/or —OR5 and —OR6 and/or —OR4 and —OR6 together, including the P atom of the phosphonate group, form a cyclic phosphonic acid ester or a cyclic phosphonic acid anhydride having a ring size of 4-10 atoms, wherein
• A.) one of the substituents R1 to R6 or
• B.) one of the cycles formed when
• 1) The substituents R3-R6 form a cyclic phosphinic or phosphonic acid ester according to (P-ii) or (P-iii), or
• 2) The substituents R3-R6 form a cyclic phosphinic or phosphonic acid anhydride according to (P-ii) or (P-iii), or
• 3) The substituents R1 and R2 form a heterocycle according to (N-ii),
• has a first uncharged or negatively charged functional group that has a heteroatom selected from the group consisting of P, O, N, S, I, CI, Br, F,
• wherein the functional group is not-OH, and for the case that one of the cycles according to 1) to 3) has the functional group, the ring atoms of the cycles are substituted with the functional group or with a substituent that has the functional group, and
• wherein the term “halogen-free” means that the total halogen content is <1000 ppm by weight.