Patent ID: 7767748

Claim:
An aqueous polymer dispersion obtained by emulsion polymerization of ethylenically unsaturated monomers in an aqueous medium in the presence of at least one free radical polymerization initiator and at least one stabilizer; wherein: the at least one stabilizer is employed before, during or after polymerization; the at least one stabilizer comprises at least one amphiphilic polymer comprising one or more hydrophobic units A and one or more hydrophilic units B; the one or more hydrophobic units A are formed from a polyisobutene block, at least 50 mol % of polyisobutene macromolecules of the polyisobutene block having terminally arranged double bonds, based on a total number of polyisobutene macromolecules; the one or more hydrophilic units B are formed from at least one alkylene oxide selected from the group consisting of monoaminoethylene oxide, monothioethylene oxide, and diaminoethylene oxide; and the at least one amphiphilic polymer has an ABA structure.