Stabilized compositions containing hindered hydroxyalkanoates
AssigneeCiba-Geigy Corporation
InventorsMartin Dexter, David Herbert Steinberg
Life of this patent
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Abstract
The compounds are esters having the formula ##STR1## wherein R.sub.1 is alkyl, cycloalkyl, alkylthioethyl or alkylpolyoxyalkylene, Z is oxygen or sulfur, R.sub.2 is the group ##STR2## R.sub.3 is hydrogen, alkyl, cycloalkyl, or .alpha.-methylbenzyl, R.sub.4 is alkyl or cycloalkyl, R.sub.5 is hydrogen or alkyl, provided when R.sub.3 is hydrogen, R.sub.5 is alkyl and R.sub.4 is located on the carbon atom ortho to the hydroxyl group, and A is a covalent carbon bond or lower alkylene.
Claims12
A composition of matter comprising an organic material subject to degradation and from 0.01 to 5% by weight of a stabilizing compound of the formula ##STR15## wherein R.sub.1 is alkyl of 1 to 30 carbon atoms, cycloalkyl of 5 to 12 carbon atoms, alkylthioethyl of 4 to 27 atoms in the chain or alkylpolyoxyalkylene of 4 to 27 atoms in the chain,
- Z is oxygen or sulfur,
- R.sub.2 is the group ##STR16## R.sub.3 is hydrogen, alkyl of 1 to 8 carbon atoms, cycloalkyl of 5 to 6 carbon atoms or .alpha.-methylbenzyl,
- R.sub.4 is alkyl of 1 to 8 carbon atoms or cycloalkyl of 5 to 6 carbon atoms,
- R.sub.5 is hydrogen or lower alkyl of 1 to 4 carbon atoms, or R.sub.3 and R.sub.5 together form a butylene chain which, together with the phenyl ring, form a tetrahydronaphthyl group, and provided when R.sub.3 is hydrogen, R.sub.5 is alkyl and R.sub.4 is located on the carbon atom ortho to the hydroxyl group, and
- A is a covalent carbon bond or a straight or branched lower alkylene having 1 to 8 carbon atoms.
Dependencies are inferred from the claim text.