Block oligomers containing 2,2,6,6-tetramethyl-4-piperidyl groups as stabilizers for organic materials

摘要

Compounds of the formula (I)in which the polydispersity {overscore (M)}w/{overscore (M)}n is 1; n is 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 or 15; the radicals R1 are for example hydrogen or C1-C8alkyl; R2 is for example C2-C12alkylene; the radicals A are independently of one another -OR3, -N(R4)(R5) or a group of theR3, R4 and R5, which are identical or different, are for example hydrogen or C1-C18alkyl, or -N(R4)(R5) is additionally a group of the formulawith Y being -O-, -CH2-, -CH2CH2- or N-CH3; X is -O- or N-R6; R6 is for example hydrogen or C1-C18alkyl; R is preferably a group of the formulaand the radicals B have independently of one another one of the definitions given for A; with the proviso that in the individual recurrent units of the formula (I), each of the radicals B, R, R1 and R2 has the same or a different meaning, are useful as light stabilizers, heat stabilizers and oxidation stabilizers for organic materials, in particular synthetic polymers.