A multi-layer film includes a structural layer of water-soluble film, and a barrier layer. The barrier layer is affixed to spaced apart discrete areas of the structural layer. The barrier layer has insufficient structural integrity and strength to contain a bag's contents once the structural layer has...http://www.google.com.au/patents/US6509072?utm_source=gb-gplus-sharePatent US6509072 - Multi-layer film with periodic barrier coating and methods of making and using such film
