Thick shrink film having high oxygen transmission rate

• Main Authors: WILBURN, DANIEL S, KENDRICK, CLIFFORD A
• Format: Patent
• Language: English
• Published: 24.12.2008
• Edition: 7
• Subjects: ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; BLASTING; CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS,e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES,DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; CONVEYING; DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS ORMACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS,CLIPS, WEDGES, JOINTS OR JOINTING; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HANDLING THIN OR FILAMENTARY MATERIAL; HEATING; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; LIGHTING; MECHANICAL ENGINEERING; PACKAGES; PACKAGING ELEMENTS; PACKING; PERFORMING OPERATIONS; STORING; THERMAL INSULATION IN GENERAL; TRANSPORTING; WEAPONS

A multilayer film that is particularly suited for the packaging of fresh seafood is disclosed, which comprises: (A) a first layer which is a first outer film layer and which serves as a heat seal layer, the first layer comprising a first polymer, the first layer having a thickness of from 2 to 20 percent of a total thickness of the multilayer film; and (B) at least one second layer which serves as a high oxygen transmission layer, the at least one second layer comprising at least one member selected from the group consisting of: (i) ethylene/butyl acrylate copolymer; (ii) homogeneous ethylene/alpha-olefin copolymer having a density of from 0.86 to 0.91 g/cc; (iii) heterogeneous ethylene/alpha-olefin copolymer having a density of from 0.89 to 0.91 g/cc; (iv) ethylene/methyl acrylate copolymer having a methyl acrylate mer content of from 20 to 24 mole percent; (v) ethylene/vinyl acetate copolymer having a vinyl acetate mer content of from 10 to 30 mole percent; (vi) styrene butadiene block copolymer; and the at least one second layer having a thickness of from 80 to 98 percent of the total thickness of the multilayer film; wherein the total thickness of the multilayer film being at least 1.5 mils (38 microns), and the film having an oxygen transmission rate of at least 10,000 cc/m2/24 hr at STP. The disclosure also pertains to a bag made from the film, as well as a packaged product utilizing the film.