Abstract: Novel compositions useful as stabilizers during the production of vinyl halide resins are disclosed which comprise pentavalent antimony mercaptides having the general formula: ##STR1## wherein K is 0 to 4;L is 0 to 1;M is 0 to 4;N is 0 to 4; andR is a primary alkyl, alkenyl, alkynyl having 1 to 18 carbon atoms and combinations thereof.Also disclosed is a novel method for synthesizing such compounds which comprises a single-reaction of a thiol, having the general formula HS-R, with sodium antimonate and concentrated hydrochloric acid whereby the pentavalent antimony mercaptide is obtained. The compositions of the present invention when used during vinyl halide resin processing retard discoloration and mechanical degradation at least as effectively as previously known antimony mercaptides while exhibiting shelf and light stabilities superior thereto.

Abstract: Novel compositions and use therefore as stabilizers during the production of vinyl halide resins are disclosed which comprise antimony mercaptides having the general formula: ##STR1## wherein K is 1 to 4;L is 0 to 1;M is 1 to 4;N is 1 to 4;X is oxygen or sulfur; andR is an alkyl, alkenyl, alkynyl having 1 to 18 carbon atoms and combinations thereof.Such compositions when used during vinyl halide resin processing retard discoloration and mechanical degradation at least as effectively as previously known antimony mercaptides while being more economical to produce.