| abstract |
Derivatives of 4-hydroxy-methyl-piperidine having general formula:wherein: R<sub>1</sub>, R<sub>2</sub>, R<sub>3</sub> and R<sub>4</sub> may be alkyl or may form, with the carbon they are bound to, a cycloalkyl group or the groupwith R<sub>6</sub>, R<sub>7</sub>, R<sub>8</sub> and R<sub>9</sub> being hydrogen or alkyl;R<sub>5</sub> may be H, alkyl, aryl, alkenyl, etc.;Y may be an organic or inorganic group or atom having avalence from 1 to 4 andn 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. |