Hydrazino nickel thio-bis-phenolates and polyolefins stabilized thereby

Abstract

The disclosure relates to a new class of compounds useful in stabilizing organic materials against the effects of heat and light, such materials especially including polymers such as polyolefins. The new compounds are hydrazine complexes of nickel thio-bis-phenolates, where the thio-bis-phenol is of the formula, ##STR1## where R is selected from the group consisting of hydrogen, normal alkyl or normal alkenyl, and R.sub.1 is selected from the group consisting of a normal, secondary, tertiary or cyclic alkyl group. The hydrazines used in making the complexes are of the formula ##STR2## where R.sub.2, R.sub.3 and R.sub.4 are independently chosen from the group hydrogen and primary, secondary and tertiary alkyl groups consisting of 1 to 8 carbon atoms and R.sub.3 and R.sub.4 may be joined together to form a heterocyclic structure. The resulting nickel complexes have been found to function as superior stabilizers for organic polymers and for polyolefins in particular, and also to perform synergistically in combination with other stabilizers of the prior art.