A composite membrane includes a filtration membrane with a surface; and a layer on the surface of the filtration membrane. The layer includes a polymer including a poly(ethylene glycol) moiety cross-linked with an ammonium salt or a precursor of an ammonium salt....http://www.google.com.au/patents/US8011517?utm_source=gb-gplus-sharePatent US8011517 - Composite membranes with performance enhancing layers
