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US 4,233,209 AGranted
Hindered phenol hydrazones and compositions stabilized therewith
AssigneeCiba-Geigy Corporation
InventorsMartin Dexter, David H. Steinberg
Life of this patent
Estimating the term…
Abstract
Hindered phenol hydrazones of the formula ##STR1## wherein R.sub.1 and R.sub.2 are alkyl of 1 to 8 carbons or R.sub.1 can also be hydrogen, n is 1 to 6, R' is hydrogen or alkyl, R.sub.3 is alkyl, phenyl, substituted phenyl, alkylenethioalkyl or alkylenethioether ester of a carboxylic acid or a group ##STR2## where T is a direct bond, alkylene, sulfur or oxygen interrupted alkylene or phenylene, said compounds being useful as diene rubber stabilizers.
Claims16
A hindered phenol hydrazone of the formula ##STR9## wherein R.sub.1 is hydrogen of a straight or branched chain alkyl of 1 to 8 carbon atoms,
- R.sub.2 a straight or branched chain alkyl of 1 to 8 carbon atoms,
- n is an integer of 1 to 5,
- R.sup.1 is hydrogen or alkyl of 1 to 8 carbon atoms,
- R.sub.3 is an alkyl of 1 to 18 carbon atoms, phenyl or phenyl substituted with 1 to 3 alkyl groups of 1 to 4 carbon atoms, or selected from an interrupted alkyl group of the formulae ##STR10## where p and t are independently integers of 1 to 18, R.sub.4 is an alkyl group of 1 to 17 carbon atoms or an olefinic group of the formula --(CH.sub.2)--CH.dbd.CH(CH.sub.2).sub.y CH.sub.3 where z and y are independently integers of 1 to 12, or R.sub.3 is the group ##STR11## where T is a direct bond, alkylene of 1 to 6 carbon atoms, phenylene, alkylene interrupted with sulfur or oxygen of the formula --C.sub.a H.sub.2a --X--C.sub.a H.sub.2a -- where X is sulfur or oxygen and a is an integer of 1 to 6.
1 more element
Dependencies are inferred from the claim text.