Coating medical implants with antibacterial polymers may preventpostoperative infections which are a common issue for conventional titaniumimplants and can even lead to implant failure. Easily applicable diblockcopolymers are presented that form polymer brushes via “grafting to”mechanism on titanium and equip the modified material with antibacterialproperties. The polymers carry quaternized pyridinium units to combatbacteria and phosphonic acid groups which allow the linear chains to beanchored to metal surfaces in a convenient coating process. The polymers aresynthesized via reversible-addition-fragmentation-chain-transfer (RAFT)polymerization and postmodifications and are characterized using NMRspectroscopy and SEC. Low grafting densities are a major drawback of the“grafting to” approach compared to “grafting from”. Thus, the number ofphosphonic acid groups in the anchor block are varied to investigate andoptimize the surface binding. Modified titanium surfaces are examinedregarding their composition, wetting behavior, streaming potential, andcoating stability. Evaluation of the antimicrobial properties revealed reducedbacterial adhesion and biofilm formation for certain polymers, albeit the cellbiocompatibility against human gingival fibroblasts is also impaired. Thepresented findings show the potential of easy-to-apply polymer coatings andaid in designing next-generation implant surface modifications.