Flexible hydrophilic gel film, process for its preparation and use

摘要

Flexible, hydrophilic gel film which is swellable, but not soluble, in water and comprises (a) 0.5 to 30 % by weight of at least one water-soluble polymer which is anion-active at neutral pH, (b) 0.5 to 50 % by weight of at least one water-soluble polymer which is cation-active at neutral pH, (c) 0.1 to 20 % by weight of at least one humectant, (d) 0.1 to 70 % by weight of water, (e) 0 to 75 % by weight of water-soluble or water-dispersible assistants, and (f) 0 to 50 % by weight of an active ingredient, a process for its preparation, and the use of this film for the production of a device for producing interactions between the gel film and a solid, liquid or gaseous substrate.