13-06-2013 дата публикации
Номер: US20130150528A1
There is disclosed a process for obtaining a water-borne crosslinkable composition comprising a block copolymer comprising at least blocks [A][B](where x is an integer from 3 to 80 (inc.), where y is an integer ≧10 and where y>x) and a polymer P, the block copolymer-polymer having an acid value ≦150 mg KOH per g of block copolymer-polymer, where at least block [A] and [B] is 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; and where polymer P is obtained in the presence of blocks [A][B]by an emulsion polymerisation process. 1. A process for obtaining a water-borne non-biologically active crosslinkable composition comprising a block copolymer comprising at least blocks [A][B]and a polymer P , the block copolymer-polymer composition having an acid value ≦150 mg KOH per g of block copolymer-polymer , where at least block [A] and [B] is 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 block [A] comprises:i) 0 to 50 mol % of ethylenically unsaturated monomer units bearing crosslinking functional groups;ii) 50 to 100 mol % ethylenically unsaturated monomer units bearing water-dispersing functional groups;{'sub': '1-18', 'iii) 0 to 50 mol % of ethylenically unsaturated monomers units selected from Calkyl(meth)acrylate monomers and styrenic monomers;'}iv) 0 to 35 mol % of ethylenically unsaturated monomers units different from those from i), ii)+iii); block [A] has a Hansch parameter<1.5; and', 'block [A] has an average degree of polymerisation x, where x is an integer from 3 to 80;, 'where i), ii), iii)+iv) add up to 100%;'}where block [B] comprises:i) 5 to 80 mol % of ...
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