| abstract |
The invention relates to a process for polymerization or copolymerization. According to the invention at least one polymerizable or copolymerizable monomer is polymerized or copolymerized by the radical route in the presence of a stable free radical and of an initiator of formula in which each of R1 and R2, which may be the same or different, represent an alkyl, aryl, alkylaryl or aralkyl radical comprising, for example, from up to 20 carbon atoms. The process is fast, allows the initiator to act more efficiently and results in polymers or copolymers of low yellowing index. |