| abstract |
The novel organotin compounds contain:n (a) at least one tin atom linked to one or two groups (G) chosen from hydrocarbyl groups or substituted hydrocarbyl groups, the group (G) or each group (G) being bonded to Sn through C;n (b) at least one mercaptoalkanol residue bonded to Sn through the S atom of the said residue, the O atom of the said residue being bonded to one of:n H, optionally substituted hydrocarbyl, the residue obtained by removal of the OH portion of one -COOH group of a polycarboxylic or hydroxypolycarboxylic acid, Al, B, P, Si or Ti or the residue of a compound of Al, B, P, Si or Ti that contains at least one group capable of displacing the H atom of an OH group bonded to a C atom, with the proviso that the moiety of any polycarboxylic acid so used is bonded to at least two mercaptoalkanol residues through an O atom of the said residues and a -CO- group of said polycarboxylic acid moiety;n (c) up to 52% by weight of tin, andn (d) up to 63% by weight of sulphur. n<??>The compounds are useful stabilizers for resins or polymers, especially halogen-containing resins or polymers such as P.V.C. which can be heat stabilized therewith. |