Microspheres of acrolein homopolymers and co-polymer with hydrophillic comonomers such as methacrylic acid and/or hydroxyethylmethacrylate are prepared by cobalt gamma irradiation of dilute aqueous solutions of the monomers in presence of suspending agents, especially alkyl sulfates such as sodium dodecyl...http://www.google.fr/patents/US4413070?utm_source=gb-gplus-shareBrevet US4413070 - Polyacrolein microspheres
