Polymerizable compositions containing alkoxyamine compounds derived from nitroso- or nitrone compounds

A polymerizable composition which consists essentially of

• (a) at least one ethylenically unsaturated monomer or oligomer, and
• (b) an initiator compound of formula I
• wherein
• n is 0,
• R1, R2 and R3 are each independently of one another NO2, cyano, —C(O)—R7, —OR8, unsubstituted C1-C12alkyl or phenyl, which is unsubstituted or substituted by C1-C4alkyl, C1-C4alkoxy, cyano, hydroxy, carboxy, C1-C4alkylamino or di(C1-C4alkyl)amino;
• or
• R2 and R3, together with the linking carbon atom, form a C5-C7cycloallyl radical;
• R7 is C1-C8alkyl or phenyl;
• R8 is C1-C8alkyl or C2-C8alkyl which is substituted by at least one hydroxy group;
• and
• R10 is C4-C18alkyl bound via a tertiary C-atom to the nitrogen atom, phenyl or C9C11phenyl-alkyl;
• or
• when n is 1;
• R11 is C1-C12alkyl;
• or
• R10 and R11 together for a C2-C6alkylene bridge which is unsubstituted or substituted with C1-C4alkyl;
• and
• R12 is hydrogen, unsubstituted C1-C4alkyl or phenyl.