| abstract |
Biphosphites of formula I <IMAGE> (I) wherein m is 0, 1 or 2, n is 1 to 4 or 6, R1 is hydrogen or C1-C4alkyl and, if m=2, the radicals R1 are identical or different, and A is the radical of an at least n-hydric alcohol or phenol, which radical is attached to the P atom or atoms through the alcoholic or phenolic O atom or atoms, obtainable by reacting a compound of formula II <IMAGE> (II) wherein m is 0, 1 or 2, R1 is hydrogen or C1-C4alkyl and, if m=2, the radicals R1 are identical or different and R2' is phenyl, C1-C12alkylphenyl or C1-C4alkyl, with a polyether polyol or polyether/ester polyol, the hydroxy functions of said polyether polyol or polyether/ester polyol being partially or completely esterified with the <IMAGE> are suitable for use as stabilizers, especially processing stabilizers, for organic polymers, preferably PVC resins, high density polyethylene and propylene. |