Patent ID: 6632895
Filing Date: 2003-10-14
Classification: C07D,C08F

Abstract:
A process for the preparation of mono- and difunctional alkoxyamine initiators of the formula (I) whereinR1, R2 and R3 are the same or different and represent H, C1-C20-(cyclo)alkyl, C6-C24-aryl, halogen, CN, C1-C20-(cyclo)alkyl ester or -amide or C6-C24-aryl ester or -amide, and R4 and R5 are the same or different and represent aliphatic, cycloaliphatic or mixed aliphatic/aromatic radicals having 1 to 24 carbon atoms, which can also be part of a 4- to 8-membered ring, wherein the carbon atom of the radicals R4 and R5 directly adjacent to the alkoxyamine nitrogen atom is in each case substituted by 3 further organic substituents (i.e. not hydrogen) or a double-bonded carbon, oxygen, sulfur or nitrogen atom and a further organic substituent (not hydrogen), and wherein at least one of the radicals R4 and R5 can contain a functional group Y selected from the group consisting of hydroxy, primary amine, secondary amine and epoxide, wherein A) a monomer which can be polymerized by free radicals, of the formula (M) HR1C&boxH;CR2R3, â€ƒis reacted with B) a system, which produces free radicals, of B1) a compound having a reducing action, B2) a compound which can be split into one or more free radicals by the action of component B1, B3) a cyclic or acyclic nitroxide of the formula (N) R4R5NO â€ƒin a solvent.