Biphosphites

Abstract

Biphosphites of formula I ##STR1## wherein m is 0, 1 or 2, n is 1 to 4 or 6, R.sub.1 is hydrogen or C.sub.1 -C.sub.4 alkyl and, if m=2, the radicals R.sub.1 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 ##STR2## wherein m is 0, 1 or 2, R.sub.1 is hydrogen or C.sub.1 -C.sub.4 alkyl and, if m=2, the radicals R.sub.1 are identical or different and R.sub.2 ' is phenyl, C.sub.1 -C.sub.12 alkylphenyl or C.sub.1 -C.sub.4 alkyl, 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 ##STR3## are suitable for use as stabilizers, especially processing stabilizers, for organic polymers, preferably PVC resins, high density polyethylene and propylene.

Dependencies are inferred from the claim text.