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 ##STR1## 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, Are 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-tetramethylpiperidin-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.
Claims25
A compound of the formula ##STR8## wherein R.sub.1 and R.sub.2 independently of each other are straight- or branched-chain alkyl having from 1 to 6 carbon atoms, 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, alkyl having 1 to 12 carbon atoms, .beta.-methoxyethyl, alkenyl having 3 to 4 carbon atoms, propargyl, benzyl or alkyl 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 barium, magnesium, calcium, sodium, copper, and potassium, and the value of z is the same as the available valence of M.
Dependencies are inferred from the claim text.