Hindered phenyl phosphites

Abstract

Compounds of the formula ##STR1## WHEREIN R.sub.1 and R.sub.2 are independently alkyl or hydrogen, provided only one of R.sub.1 and R.sub.2 is hydrogen, R.sub.3 is --(A).sub.q --COOR.sub.4 or CN, where A is alkylene, R.sub.4 is alkyl, phenyl or alkyl substituted phenyl, q is 0 or 1, m and n are each 1 or 2, the values of m and n being such that the trivalent state of P is satisfied, R is (a) halogen, (b) hydroxyl, provided that n is 1 when R is hydroxyl, (c) --XR.sub.5 wherein X is S or O, and R.sub.5 is alkyl, phenyl, alkyl substituted phenyl, or when X is O, R.sub.5 is alkanoyl, benzoyl, or alkyl substituted benzoyl, (d) a group of the formula ##STR2## wherein R.sub.6 is phenylene, alkyl substituted phenylene, or alkylene, X is as defined above, and m and n are each 1, (e) a group of the formula ##STR3## wherein R.sub.7 is hydrocarbyldiacyl, R.sub.1, R.sub.2 and R.sub.3 are as defined above, and m is 2 and n is 1, or (f) a group of the formula ##STR4## wherein R.sub.1, R.sub.2 and R.sub.3 are as defined above, and m and n are each 1, are suitable for stabilizing organic material against thermal, oxidative and ultraviolet light degradation.

Dependencies are inferred from the claim text.