Patent ID: 7935757

Claim:
A process for making an aqueous coating composition comprising a cationic vinyl oligomer comprising the following steps: I. preparation of a cationic vinyl oligomer by solution or bulk polymerisation of components comprising: i) 2 to 50 wt % of vinyl monomers bearing amine functional groups selected from the group consisting of non-ionic amine functional groups (a), permanent quaternary ammonium functional groups (b), neutralised amine functional groups (c) and mixtures thereof; ii) 20 to 98 wt % of C 1 to C 18 alkyl (meth)acrylates; iii) 0 to 30 wt % of styrene based monomers; iv) 0 to 15 wt % of vinyl monomers bearing hydroxyl functional groups; and v) 0 to 15 wt % of vinyl monomers different from those from i), ii), iii) and iv); where i), ii), iii), iv) and v) add up to 100%; and II. dispersion of the cationic vinyl oligomer in an aqueous medium and neutralisation of non-ionic amine functional groups.