Liquid stabilizer systems and vinyl halide resin compositions containing same

A heat and light stable resinous composition comprising a vinyl halide resin and 0.2 percent to 5 percent by weight, based on the weight of the vinyl halide resin, of a liquid stabilizer that comprises

• 40% to 90% by weight of an organotin ethanol mercaptide having the structural formula ##STR9## wherein each R represents an alkyl group having 1 to 8 carbon atoms;
• R' represents --SCH.sub.2 CH.sub.2 OH, --SCH.sub.2 COOR", or --SR";
• R" represents an alkyl group having 6 to 18 carbon atoms;
• a, b, m, and n each represents 1 or 2;
• X represents 0 or 1;
• when X is 0, m + n + b = 4;
• and
• when X is 1, m + n = 3 and a + b= 3;
• b. 10% to 60% by weight of a liquid alcohol component comprising a glycol having 2 to 10 carbon atoms;
• and
• c. 0.1% to 1% by weight of an alkyl acid phosphate selected from the group consisting of monoalkyl acid phosphates, dialkyl acid phosphates, and mixtures thereof, in which each alkyl group has from 1 to 10 carbon atoms.

An organotin ethanol mercaptide selected from the group consisting of

• a. compounds having the structural formula ##STR12## wherein R represents an alkyl group having 1 to 8 carbon atoms;
• R.degree. represents --SCH.sub.2 COOR" or --SR";
• R" represents an alkyl group having 6 to 18 carbon atoms;
• b, m, and n each represents 1 or 2;
• and
• m + n + b = 4;
• and
• b. compounds having the structural formula ##STR13## wherein R and R" have the aforementioned significance;
• R' represents --SCH.sub.2 CH.sub.2 OH, --SCH.sub.2 COOR", or --SR";
• a, b, m, and n each represents 1 or 2;
• a + b = 3;
• and
• m + n = 3.