this invention pertains to cross - linked hydrophilic polymeric films , the process of making such films , and their use . the films of this invention are produced by solubilizing a water - soluble polymer with a photosensitive or light degradable catalyst , optionally drying said solution , and exposing the solution to an energy source , particularly light . these films are suitable for use as a carrier for biologically active agents , such as pharmaceuticals , both human and veterinary , insecticides , and fertilizers ; as hydrophilic membranes for separation processes ; as bandages for wound treatment ; as body implants or as coatings for such implants ; and as coatings on glass , metal , wood or ceramics .