Bis(substituted thioalkyl)hydroxylamines and stabilized polyolefin compositions
AssigneeCiba-Geigy Corporation
InventorsRamanathan Ravichandran, John D. Spivack
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Abstract
Bis(substituted thioalkyl)hydroxylamine derivatives are effective in stabilizing polyolefin compositions containing a stabilizer or mixture of stabilizers selected from the group consisting of the phenolic antioxidants, the hindered amine light stabilizers, the alkylated hydroxybenzoate light stabilizers, the ultraviolet light absorbers, the organic phosphorus compounds, the alkaline metal salts of fatty acids and the thiosynergists, against degradation upon high temperature extrusion, exposure to the combustion products of natural gas, gamma irradiation or upon storage for extended periods.
Claims28
A compound of formula I ##STR6## wherein R.sub.1 and R.sub.2 are independently ##STR7## R.sub.4 and R.sub.5 are independently alkyl of 1 to 18 carbon atoms, cycloalkyl of 5 to 6 carbon atoms, phenyl, alkaryl of 7 to 18 carbon atoms or aralkyl of 7 to 9 carbon atoms, and R.sub.3 is hydrogen or alkyl of 1 to 12 carbon atoms.
A composition, stabilized against degradation, which comprises
- (a) a material subject to oxidative, thermal or light-induced degradation, and
- (b) a stabilizing amount of a compound of formula A ##STR8## wherein T.sub.1 and T.sub.2 are indpendently alkyl of 1 to 18 carbon atoms, cycloalkyl of 5 to 6 carbon atoms, phenyl, alkaryl of 7 to 18 carbon atoms, aralkyl of 7 to 9 carbon atoms or ##STR9## where T.sub.4 and T.sub.5 are independently alkyl of 1 to 12 carbon atoms, cycloalkyl of 5 to 6 carbon atoms, phenyl, alkaryl of 7 to 18 carbon atoms or aralkyl of 7 to 9 carbon atoms;
- or
- T.sub.1 and T.sub.2 together are alkylene of 2 to 3 carbon atoms;
- and
- T.sub.3 is hydrogen or alkyl of 1 to 12 carbon atoms.
A compound of formula A ##STR11## wherein T.sub.1 and T.sub.2 are independently alkyl of 8 to 18 carbon atoms, and
- T.sub.3 is hydrogen or alkyl of 1 to 12 carbon atoms.
Dependencies are inferred from the claim text.