Abstract: Polymeric ink binders are described that comprise two parts A and B (optionally particles having a core B and shell A): where part A is an oligomer of: A-I a ureido monomer (e.g. N-(2-methylacryloyloxyethyl)ethylene urea, MEEU)?0.01% w/w; A-I1a C1-8(meth)acrylate (e.g. n-butyl acrylate, BA), methyl methacrylate, MMA), <96.99% w/w; and A-III is a (meth)acrylic acid (e.g. methacrylic acid, MAA)?0.01% w/w, where the part A is obtained by emulsion polymerisation in the presence of a C6-20alkylmercaptan as a chain transfer agent (CTA) and/or a C6-20 alkylsulphate salt as a surfactant; and part B is a polymer of: B-I a ureido monomer (e.g. N-(2-methylacryloyloxyethyl)ethylene urea, MEEU)?0.01% w/w; and B-I 1 a C1-8(meth)acrylate (e.g. butyl acrylate, BA, methyl methacrylate, MMA)<96.99% w/w. Use of ureido monomers to prepare ink binders having improved chemical resistance is also described.