| abstract |
Derivatives of 4-hydroxy-methyl-piperidine having general formula: <IMAGE> (I) wherein: R1, R2, R3 and R4 may be alkyl or may form, with the carbon they are bound to, a cycloalkyl group or the group <IMAGE> with R6, R7, R8 and R9 being hydrogen or alkyl; R5 may be H, alkyl, aryl, alkenyl, etc.; Y may be an organic or inorganic group or atom having a valence from 1 to 4 and n is an integer from 1 to 4. The use of the derivatives of the alkyl-substituted 4-hydroxy-methyl-piperidine of formula (I) as stabilizers of polymeric substances, and polymeric compositions stabilized with said piperdine derivatives. This invention relates to new derivatives of alkyl-substituted 4-hydroxy-methyl-piperidine, to the use thereof as stabilizers of polymeric substances usually subject to worsening owing to thermal and/or photo-oxidation, and to the polymeric compositions stabilized with said derivatives. |