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US 2002/0172833 A1Published application
Ultra high oxygen barrier films and articles made therefrom
AssigneeHoneywell International Inc.
InventorsMingliang L. Tsai, Murali K. Akkapeddi
Life of this patent
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Abstract
Oxygen barrier films exhibiting high oxygen scavenging capability suitable for extended shelf-life, packaging applications. These films comprise a polyamide homopolymer, copolymer, or blends thereof; an ethylene vinyl alcohol copolymer; an oxidizable polydiene; and at least one metal salt catalyst. These films are particularly suited to making high barrier, retortable packaging structures such as pouches, containers etc. Such articles are useful for packaging a variety of oxygen-sensitive foods, beverage, medical and health care products.
Claims37
An oxygen barrier film which comprises:
- a) a polyamide layer comprising a polyamide homopolymer, copolymer, or blends thereof;
- b) an ethylene vinyl alcohol copolymer layer attached to the polyamide layer;
- and
- c) an oxidizable polydiene and a metal salt catalyst present together in at least one of the polyamide layer and the ethylene vinyl alcohol copolymer layer.
1 more element
A multilayer article which comprises an oxygen barrier film comprising:
- A) a multilayer film comprising:
- a) a polyamide layer comprising a polyamide homopolymer, copolymer, or blends thereof;
- b) an ethylene vinyl alcohol copolymer layer attached to the polyamide layer;
- c) an oxidizable polydiene and a metal salt catalyst present together in at least one of the polyamide layer and the ethylene vinyl alcohol copolymer layer;
- and
- B) a thermoplastic polymer layer on one or both sides of the film.
3 more elements
A shaped article which comprises an oxygen barrier film comprising:
- a) a polyamide layer comprising a polyamide homopolymer, copolymer, or blends thereof;
- b) an ethylene vinyl alcohol copolymer layer attached to the polyamide layer;
- c) an oxidizable polydiene and a metal salt catalyst present together in at least one of the in at least one of the polyamide layer and the ethylene vinyl alcohol copolymer layer.
A process for producing an oxygen barrier film which comprises:
- a) separately melting a polyamide homopolymer, copolymer, or blends thereof;
- and an ethylene vinyl alcohol copolymer;
- b) blending an oxidizable polydiene, and a metal salt catalyst with either or both of the molten polyamide homopolymer, copolymer, or blend thereof;
- and the molten ethylene vinyl alcohol copolymer to thereby form an individual polyamide composition and an individual ethylene vinyl alcohol composition;
- c) extruding, casting or blowing the individual compositions into an individual polyamide film layer and an individual ethylene vinyl alcohol copolymer layer;
- d) cooling the polyamide layer and the ethylene vinyl alcohol copolymer layer;
- and
- e) attaching the polyamide layer and ethylene vinyl alcohol copolymer layer to each other.
5 more elements
A process for producing an oxygen barrier film which comprises:
- a) melting a polyamide homopolymer, copolymer, or blends thereof;
- and blending with an oxidizable polydiene and a metal salt catalyst therewith to form a polyamide composition and forming a polyamide film layer from the polyamide composition;
- b) melting an ethylene vinyl alcohol copolymer;
- and blending the copolymer with an oxidizable polydiene and a metal salt catalyst to form an ethylene vinyl alcohol composition, and forming an ethylene vinyl alcohol film layer from the an ethylene vinyl alcohol composition;
- and
- c) conducting step (i) or (ii) or (iii):
- (i) attaching the polyamide film layer to a neat ethylene vinyl alcohol copolymer film layer which is substantially free of oxidizable polydiene and metal salt catalyst;
- (ii) attaching the ethylene vinyl alcohol copolymer film layer to a neat polyamide film layer which is substantially free of oxidizable polydiene and metal salt catalyst;
- or
- (iii) attaching the polyamide film layer to the ethylene vinyl alcohol copolymer film layer.
7 more elements
A process for producing an oxygen barrier article which comprises:
- a) separately melting a polyamide homopolymer, copolymer, or blends thereof;
- and an ethylene vinyl alcohol copolymer;
- b) blending an oxidizable polydiene, and a metal salt catalyst with either or both of the molten polyamide homopolymer, copolymer, or blend thereof and the molten ethylene vinyl alcohol copolymer to thereby form an individual polyamide composition and an individual ethylene vinyl alcohol composition;
- c) conducting either step (i) or (ii) or (iii):
- (i) coextruding, casting, blowing, thermoforming, blow molding or coinjecting the polyamide composition with the ethylene vinyl alcohol copolymer composition to thereby form an oxygen barrier article;
- (ii) melting a neat polyamide homopolymer, copolymer, or blend thereof which is substantially free of oxidizable polydiene and metal salt catalyst to forma neat polyamide composition;
- and then coextruding, casting, blowing, thermoforming, blow molding or coinjecting the neat polyamide composition with the ethylene vinyl alcohol copolymer composition to thereby form an oxygen barrier article;
- (iii) melting a neat ethylene vinyl alcohol copolymer which is substantially free of oxidizable polydiene and metal salt catalyst to form a neat ethylene vinyl alcohol composition;
- and then coextruding, casting, blowing, thermoforming, blow molding or coinjecting the neat ethylene vinyl alcohol composition with the polyamide composition to thereby form an oxygen barrier article.
6 more elements
Dependencies are inferred from the claim text.