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 Organotin compounds are excellent heat stabilizers and are used world
wide in almost all PVC processing techniques: calendering, rigid and flexible
extrusion for indoor and outdoor use, blow molding and injection molding.
The nature of the alkyl group R (methyl, butyl, octyl, dodecyl) and the
ligand X attached to the tin atom makes it possible to obtain different
performance levels. Specific requirements such as transparency and outdoor
weatherability are achievable by changing the nature of the anionic ligand.
The use of tin in PVC heat stabilizers represents about 3.5 percent of
the global production of tin. The European consumption of organotin PVC
stabilizers in 1995 was approximately 15.000 metric tons, accounting for
6 - 8 percent of the total use of stabilizers for PVC. A typical application
level for organotin stabilizers is up to 2 percent of the plastic weight.
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