Hindered piperidine carboxylic acids, metal salts thereof and stabilized compositions

Abstract From the Canadian patent

A compound of the formula I, wherein, R1 are same and stand for hydrogen or alkyl having from 1 to 6 carbon atoms, R2 is hydrogen alkyl having 1 to 12 carbon atoms, alkenyl having 3 to 4 carbon atoms propargyl, benzyl, alkyl, substituted benzyl aliphatic acyl having 1-4 carbon atoms C2-C21 alkoxyalkyl or oxyl, R3 is straight-chain alkenylene of 2 to 4 carbon atoms, 1,2-cycloalkylene or 1,2-cycloalkenylene having 4 - 1 -, to 6 carbon atoms, 2,3-bicycloalkylene or 2,3-bicycloalkenylene having 7 or 8 carbon atoms or 1,2- 1,3-, or 1,4-, phenylene or straight-chain alkylene of 1 to 4 carbon atoms substituted by alkyl or alkenyl of 1 to 18 carbon atoms provided that said straight-chain alkylene …