Metal salts of hindered piperidine carboxylic acids and stabilized compositions
AssigneeCiba-Geigy Corporation
InventorsChester E. Ramey, John J. Luzzi
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Abstract
Compounds having the formula ##EQU1## wherein R.sub.1 and R.sub.2 are lower alkyl or cycloalkyl, R.sub.3 is hydrogen, alkyl, methoxyethyl, alkenyl, propargyl, benzyl or alkyl substituted benzyl, R.sub.4 is lower alkylene, M is a metal, and z has a value of from 1 to 4, And good light stabilizers. The carboxylic acids are prepared, for example, from 2,2,6,6-tetramethyl-piperidin-4-ol and succinic acid to give o-mono(2,2,6,6-tetramethyl-piperidin-4-ol)succinate. The metal salts of the acids are readily prepared by reacting the acids or their salts with a reactive form of the metal or metal complex.
Claims10
A compound of the formula ##EQU7## wherein R.sub.1 and R.sub.2 independently of each other are straight or singly branched-chain alkyl of formula
- --CH.sub.2 (C.sub.n H.sub.2n.sub.+1)
- where n is 0 to 5, or together with the carbon to which they are bound form a cyclopentyl or cyclohexyl ring, which is unsubstituted or substituted with a methyl group,
- R.sub.3 is hydrogen, a straight-or singly branched-chain alkyl of formula
- --CH.sub.2 (C.sub.n H.sub.2n.sub.+1)
- where n is 0 to 11, .beta.-methoxyethyl, alkenyl having 3 or 4 carbon atoms, propargyl, benzyl or methyl substituted benzyl,
- R.sub.4 is straight- or branched-chain alkylene having 1 to 4 carbon atoms,
- M is a metal selected from the group consisting of nickel, manganese, zinc, iron, cobalt, tin and di-n-alkyl tin of up to 8 carbon atoms, and
- z has a value of from 1 to 4, the value of z being the same as the available valence of M.
Dependencies are inferred from the claim text.