摘要 |
<p>Disclosed is a piperidine derivatives of a formula: <CHEM> wherein: R<0> indicates a hydrogen atom or a group <CHEM> where R is an alkyl, alkylene or arylene group capable of having 1 to 4 carboxylic group; R<1> indicates a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an acyl group having 2 to 7 carbon atoms, or an arylalkyl group having 7 to 10 carbon atoms; R<2> and R<2>' respectively indicate a hydrogen atom, or an alkyl group having 1 to 4 carbon atoms; R<3> and R<4> in combination indicate a group =CH-R<5>, or R<3> indicates a hydrogen atom and R<4> indicates either -CH2-R<5> wherein R<5> is a substituted or non-substituted phenyl group or a substituted or non-substituted cyclohexyl group the substituent being an alkyl having 1 to 4 carbon atoms, or a 2-furyl group or a tetrahydrofuryl group; and n indicates an integer of 1 to 4. The piperidine derivatives are improved photostabilizer to various organic materials including poly- alpha -olefins with least breeding out tendency.</p> |