Sankyo Company, Limited

Hisayou Ohsawa

Takao Yoshioka

Tomoyuki Kurumada

Eiko Mori

Toshimasa Toda

Hideo Horiuchi

Susumu Higashida

Katsuaki Matsui

Syoji Morimura

Keisuke Murayama

Noriyuki Ohta

Noriyuki Ohata

Keisuku Murayama

Syoji Moriyama

Piperidine derivatives having the formula ##STR1## wherein R' represents an alkyl, an acyl, an alkoxycarbonyl, an amino or nitroso group;

Piperidine derivatives

A synthetic polymer composition stabilized against photo- and thermal-deterioration comprising a stabilizing amount of a compound having the formula ##STR1## wherein R' represents an alkyl, an acyl, an alkoxycarbonyl, an amino or nitroso group;

Polymer compositions containing piperidine derivatives as stabilizers

Piperidine-spiro-hydrantoin derivatives having the formula ##STR1## wherein X represents oxygen atom or sulfur atom; n is an integer of 1 to 4 inclusive; and

Piperidine-spiro-hydantoin derivatives

Piperidine-spiro-hydantoin derivatives having the formula ##SPC1## Wherein X represents oxygen atom or sulfur atom; n is an integer of 1 to 4 inclusive, and R represents various aliphatic or aromatic groups depending on the value of n. These compounds (I) are useful as stabilizers against photo and thermal deterioration of various synthetic polymers and can be prepared, for example, by reacting the corresponding 3-unsubstituted piperidine-spiro-hydantoin compound with the halide R-(X.sub.1).sub.n in which R and n are as defined herein and X.sub.1 is a halogen atom.

Piperidine-spiro-hydantoin derivatives and their use as stabilizers

Piperidine derivatives having the formula ##SPC1## Wherein

Piperidine derivatives and their use as stabilizers

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Hisayou Ohsawa