Food-grade vinyl halide polymer compositions stabilized with monoalkyltin compounds
AssigneeM&T Chemicals Inc.
InventorWilliam A. Larkin
Life of this patent
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Abstract
Monoalkyl tin derivatives of mercaptoacetic acid esters, such as mono-n-octyltin-S,S', S"-tris(isooctyl mercaptoacetate), are useful as food-grade stabilizers for vinyl halide polymers.
Claims25
A stabilized vinyl halide polymer composition suitable for contact with food containing more than 0.15 parts per 100 parts of polymer of monoalkyltin compounds of formula:
- n--C.sub.8 H.sub.17 Sn(SCH.sub.2 COOR).sub.3
- where R is a linear or branched alkyl group of 8 carbon atoms.
A stabilized vinyl halide polymer composition suitable for contact with food containing more than 0.15 and up to 5 parts per 100 parts of polymer of monoalkyltin compounds of formula
- n--C.sub.8 H.sub.17 Sn(SCH.sub.2 COOR).sub.3
- where R is a linear or branched alkyl group of 8 carbon atoms, said monoalkyltin compound being characterized by:
- (a) an acute toxicity value for rats and dogs, expressed as LD.sub.50, greater than about 1.00 gram per kilogram of body weight,
- (b) an extractability from polyvinyl chloride by heptane of not more than 0.05 milligram per square decimeter of exposed surface, and
- optionally containing a dialkyltin compound of formula
- (n--C.sub.8 H.sub.17).sub.2 Sn(SCH.sub.2 COOR').sub.2
- where R' is a linear or branched alkyl group of 8 carbon atoms.
A method of stabilizing a vinyl halide polymer composition intended for contact with food which comprises incorporating therein more than 0.15 parts per 100 parts of polymer of monoalkyltin compounds of formula
- n--C.sub.8 H.sub.17 Sn(SCH.sub.2 COOR).sub.3
- where R is a linear or branched alkyl group of 8 carbon atoms.
Dependencies are inferred from the claim text.