Patent ID: 8449984
Filing Date: 2013-05-28
Classification: B32B,Y10T

Abstract:
1. A thermoformable coextruded breathable packaging non-oriented film comprising: (a) at least a first polymeric layer, a second polymeric layer, a third polymeric layer, a fourth polymeric layer, a fifth polymeric layer and a sixth polymeric layer; (b) wherein said first polymeric layer is an outermost exterior-film layer and comprises a polyester selected from the group consisting of aliphatic polyesters, cycloaliphatic polyesters, polyethylene terephthalate (PET), polyethylene terephthalate glycol (PETG), polypropylene terephthalate (PPT), polybutylene terephthalate (PBT) and blends thereof; (c) wherein said second polymeric layer is directly contacting said first and third polymeric layers and comprises a polyalkyl acrylate copolymer or blend thereof; (d) wherein said third polymeric layer is directly contacting said second and fourth polymeric layers and comprises either a polypropylene or cross-linked polyethylene; (e) wherein said fourth polymeric layer is directly contacting said third and fifth polymeric layers and consisting essentially of polyethylene; (f) wherein said fifth polymeric layer is directly contacting said fourth and sixth layers and consisting essentially of polypropylene; (g) wherein said sixth polymeric layer is an innermost exterior-filer layer and comprises a heat-sealable polyolefin; (h) wherein said film has an oxygen transmission rate at 73° F. (23° C.) and 0% R.H. of between 32-1000 cm (i) wherein said film comprises an unrestrained linear thermal shrinkage at 80° C. of 0-5% in both the machine and transverse direction as measured in accordance with ASTM D-2732-96 test method.