A process for producing water-absorbing polymer particles by polymerizing droplets of a monomer solution in a gas phase surrounding the droplets and postcrosslinking the polymer particles, wherein the postcrosslinked polymer particles are at least partly coated.本發明係關於一種藉由使單體溶液之小液滴在環繞該等小液滴之氣相中聚合且使聚合物顆粒後交聯來製造吸水聚合物顆粒的方法,其中該等後交聯聚合物顆粒為至少部分經塗佈的。