Octyl tin mercaptides

Poly(vinyl chloride) or a chlorinated pol5rvinyl chloride is stabilized with composition comprising either methyl, butyl or octyl tin mercaptide stabilizer and salt of a polymeric polyacid material in the solid form. The last improves performance of tin stabilizer, especially if the moisture level in composition is higher than 0.52 wt%. 

Food packaging film Mercaptides Calendered sheet Methyl/octyl tin mercaptides 0.8-1.4 16-19 8.00-11.00... 

Among these heat stabilisers, those containing tin (such as tin mercaptides, and tin carboxylates or maleates) are considered to be the most efficient, and can be used in a wide variety of applications. Metallic tin is harmless but there are suspicions that organotin-compounds can be toxic to the central nervous system and the liver. However, tin stabilisers have a low capacity for migrating, and hence they are still considered to be safe. Tin stabilisers such as methyl and octyl tins are used in food contact applications. For PVC, it is believed that tin stabilisers act as HCl scavengers (generating tin chloride) as well as an antioxidant. Thio-tin compounds (preferred for rigid pipe extrusions and profiles (for window frames) of PVC) may develop an odd odour due to sulfur. 

Tin stabihzers are commonly used. There are many types in use but generally they are monoalkyl or dialkyl tin esters or mercaptides. Common alkyl groups are methyl, butyl, and octyl. Alkyl tin thioglycolates are effective heat stabilizers and are commonly used. 

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