SOLVENT BORNE CROSSLINKABLE BLOCK COPOLYMERS OBTAINED USING RAFT

摘要

There is disclosed a process for obtaining a solvent-borne crosslinkable block copolymer comprising at least blocks [A]x[B]y[C]z, said block copolymer having an acid value < 20 mgKOH/g, where at least blocks [A][B][C] are obtained by a controlled radical polymerisation of at least one ethylenically unsaturated monomer via a reversible addition-fragmentation chain transfer (RAFT) mechanism in solution in the presence of a control agent and a source of free radicals; where blocks [A] and [C] may be the same or different; [A] has an average degree of polymerisation (DP) of x, where x is an integer from 3 to 40 (inc.); [B] has an DP of y, where y is an integer > 5; [C] has an DP of z, where z is an integer > 3 and each of the blocks [A], [B] and [C] are solvent soluble.