The invention relates to pH modulated films and methods of their preparation. The film compositions include at least one component having a non-neutral pH when combined with water; and a pH modulated polymer system selected to reduce or prevent synerisis when combined with the non-neutral component in...http://www.google.com.au/patents/US7910641?utm_source=gb-gplus-sharePatent US7910641 - PH modulated films for delivery of actives
