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US 5,350,622 AGranted
Multilayer structure for a package for scavenging oxygen
AssigneeW. R. Grace & Co.-Conn.
InventorsDrew V. Speer, Charles R. Morgan, William P. Roberts, Andrew W. VanPutte
Life of this patent
Estimating the term…
Abstract
Products and film structures using the oxygen scavengers, are disclosed. Such products demonstrate enhanced shelf stability of foodstuffs and reduced sensitivity to humidity and temperature changes.
Claims17
A multilayer structure for a package comprising
- (a) a oxygen barrier layer or layers having an oxygen transmission rate less than or equal to 500 cc/(m.sup.2 .multidot.atm.multidot.day) at 25.degree. C., and
- (b) an oxygen scavenging layer or layers comprising an oxygen scavenging system consisting essentially of an ethylenically unsaturated hydrocarbon and a transition metal catalyst having a rate of oxygen scavenging in the presence or absence of (a) which is at least 5 cc oxygen per square meter per day at 25.degree. C., and
- wherein the multilayer structure is flexible, has a thickness of about 5 to 400 microns, and has an oxygen transmission of less than 0.5 cc O.sub.2 /(m.sup.2 .multidot.day.multidot.atm).
Dependencies are inferred from the claim text.