| abstract |
The present invention relates to certain 1-alkoxy-2,2-diethyl-6,6-dimethylpiperidine derivatives and 1-alkoxy-2,6-diethyl-2,3,6-trimethylpiperidines substituted at the 4-position by an atom of oxygen or nitrogen; a polymerizable composition comprising a) at least one ethylenically unsaturated monomer and b) said piperidine derivatives. Other aspects of the present invention relate to a process for the polymerization of ethylenically unsaturated monomers and the use of 1-alkoxy-2,2-diethyl-6,6-dimethylpiperidine derivatives and 1-alkoxy-2,6 diethyl-2,3,6-trimethylpiperidines substituted in the 4-position by an oxygen or nitrogen atom for controlled polymerization. N-oxyl intermediates, compositions of the N-oxyl derivatives with ethylenically unsaturated monomers and a free radical initiator, as well as a polymerization process are also objects of the present invention. |