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Patented Film and Film Structures with Improved Oxygen Permeability, Formability, and Puncture Resistance Patent Applicant Namur DuPont Company Principal Applicant Address Delaware State Inventor B.A. Morris; T.A. Libert; J. UraniÅ¡ek Application (Patent) No. 03814439.5 Date of Application 2003.04.17 Award Date Approval Notice No. 1662371 Audit Notice Date 2005.08.31 Instruction CD-ROM D0535 Main Classification Number B32B27/08 Classification Number B32B27/08; B65D75/58 division Original application No. 2002.4.19 US 60/373,798; 2003.4.16 US 10/414,608 Abstract A gas permeable membrane is disclosed comprising: at least one polymer layer, the layer being 100% And an ionomer containing sufficient aliphatic monofunctional organic acid salt to substantially increase the oxygen transmission value (OTV) by a factor of three; and/or at least one optionally mixed with low density polyethylene, and preferably with a Or a combination of multiple highly neutralized ionomers (eg, Surlyn #+[îˆ]) outer layer combined metallocene polyethylene (mPE) polymer layers. Such polymer films and polymer film structures have sufficient oxygen permeability, water vapor permeability, formability and structural strength for packaging foods that require breathable films, such as boxed cold cut meats, fish, sausages And fresh produce and so on. Sovereignty item 1. A packaged food product comprising a food product in an oxygen- and/or moist air sealed in a multilayer polymeric film selected from boxed cold cut meats, fish, sausages, and fresh produce , wherein at least one of the multilayer polymer films consists essentially of a blend of (a) one or more aliphatic monofunctional organic acids or salts thereof having less than 36 carbon atoms and (b) ) One or more E/X/Y copolymers, wherein E is derived from ethylene, X is derived from C3-C8 alpha, beta-ethylenically unsaturated carboxylic acid, and Y is derived from a plasticizing comonomer, or said E An ionomer of a /X/Y copolymer, wherein X is about 3-30 wt.% of the E/X/Y copolymer and Y is 0 to about 30 wt.% of the E/X/Y copolymer, And more than 90% of all the acid moieties of (a) and (b) are neutralized. International Application PCT/US2003/011877 2003.4.17 International Publication WO2003/089240 English 2003.10.30 Date of entry into the country Patent agency China Patent Agency (Hong Kong) Co., Ltd. Agency address Agent Zou Xuemei; Zhao Sulin