Abstract: Improved liquid stabilizers consisting of a metal halide and an ethoxylated alkylphenol are provided to impart superior thermal stability to PVC resins while minimizing early color formation. The stabilizers may optionally contain a polyglycerol partial ester and/or liquid fatty acid.

Abstract: Novel hindered zinc organic phosphites are produced by the reaction of zinc carboxylic acid salts and organic phosphites. The hindered zinc organic phosphites are excellent sources for zinc in vinyl halide resin stabilizers to prevent resin degradation by heat and light. Vinyl halide resin compositions containing the hindered zinc organic phosphites in relatively large amounts of divalent zinc can be processed under elevated temperatures over extended periods of time without undergoing catastrophic degradation.The hindered zinc organic phosphites are characterized by the formulas: ##EQU1## Where R' is either an alkyl, aryl, aralkyl, or alkaryl radical with the proviso that at least one R' radical is aryl or alkaryl; and R" is aryl or alkaryl.