Akzo N.v.

Malcolm Mellor

Peter Hope

Novel organotin compounds of the formula: ##STR1## wherein q is 1 or 2; m is 1,2 or 3; R.sub.6 is an alkyl group having from 1 to 18 carbon atoms, a cycloalkyl group having from 3 to 6 carbon atoms, an aryl group, an aralkyl group, and alkaryl group having up to 30 carbon atoms, or a group of the formula: ##STR2## wherein R.sub.7, R.sub.8, R.sub.9 and R.sub.10 are each independently an alkyl group having from 1 to 18 carbon atoms, an oxygen-containing hydrocarbon group or a hydrogen atom, with the proviso that at least one of R.sub.7 and R.sub.8 contains, adjacent to the HC grouping, a carbonyl group which forms part of an acid group, an ester group, and acid halide group, a ketone group or an aldehyde group; when q=1, R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5, are, each independently, a hydrogen atom, an alkyl or alkoxy group having from 1 to 14 carbon atoms, a cycloalkyl or cycloalkoxy group, having from 3 to 6 carbon atoms, a nitro group or a halogen atom; and when q=2, m=1, and the two structural units in the para position are interlinked directly or by way of an oxygen atom, a methylene group, an SO.sub.2 group of an isopropylidene group and R.sub.1 R.sub.2 R.sub.4 and R.sub.5 are each as defined above, and a process for making the same. The compounds may be formulated into stabilizer compositions and used to stabilize polyvinyl chlorides and polyvinylidene chloride against heat and light deterioration. They may be used with 2,4,6-trisubstituted phenolic antioxidants, and mono or di-alkyl or ester tin sulphides.

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St. Helens, United Kingdom

Malcolm Mellor