Patent ID: 9567476
Date: 2017-02-14
CPC Classifications: C08F,C08L,C09D

Claim:
1. A process for obtaining a water borne non-biologically active crosslinkable block copolymer-polymer composition comprising a crosslinkable block copolymer comprising at least blocks [A] x [B] y , a polymer P, and a separate crosslinking agent, wherein the block copolymer-polymer composition has an acid value ≦150 mg KOH per g of block copolymer-polymer, wherein the process comprises: (a) subjecting at least one ethylenically unsaturated monomer by a controlled radical polymerization via a reversible addition-fragmentation chain transfer (RAFT) mechanism in solution in the presence of a control agent selected from the group consisting of dithioesters, thioethers-thiones, trithiocarbonates, dithiocarbamates, xanthates and mixtures thereof, and in the presence of a source of free radicals to obtain at least blocks [A] and [B], wherein a first block [A] is prepared followed by the polyemerisation of at least a second block [B] or wherein a first block [B] is prepared followed by the polymerization of at least a second block [A], thereby obtaining the block copolymer; wherein the wt % of blocks [A][B] together is in the range of from 0.5 to 50% based on the weight of the blocks [A][B] and the polymer P; and wherein block [A] comprises: block [B] comprises: (b) conducting an emulsion polymerization process in the presence of the block copolymer obtained according to step (a) to obtain the polymer P, wherein the polymer P comprises: (c) combining the crosslinkable copolymer-polymer with a separate crosslinking agent to obtain the water-borne non-biologically active crosslinkable copolymer-polymer composition.