AQUEOUS DISPERSIONS CONTAINING CRYSTALLISABLE BLOCK COPOLYMERS

摘要

An aqueous dispersion comprising a crystallisable vinyl block copolymer - polymer which comprises: i) a vinyl block copolymer comprising at least blocks [A]x [B] y , wherein at least a crystallisable block [A] is obtained by a controlled radical polymerisation of at least one vinyl 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; and wherein the vinyl block copolymer comprises 2 to 50 wt % of vinyl monomers bearing at least a crystallisable side chain by weight of the vinyl block copolymer - polymer; wherein crystallisable block [A] has an average degree of polymerisation x, wherein x is an integer in the range of from 3 to 80; wherein block [B] has an average degree of polymerisation y, wherein y is an integer = 3; and ii) a vinyl polymer [P] obtained by the free radical emulsion polymerisation of one or more vinyl monomers in the presence of the vinyl block copolymer; and wherein the block copolymer : polymer weight ratio is in the range of from 10:90 to 70:30.