초록 ▼

Disclosed are rigid or semi-rigid multilayer structures that provide high oxygen permeability values comprising metallocene polyethylene, ethylene/vinyl acetate copolymers or highly neutralized blends of ethylene acid copolymers, organic acid salts and optionally one or more ethylene-containing poly

Disclosed are rigid or semi-rigid multilayer structures that provide high oxygen permeability values comprising metallocene polyethylene, ethylene/vinyl acetate copolymers or highly neutralized blends of ethylene acid copolymers, organic acid salts and optionally one or more ethylene-containing polymers or silicon-containing polymers. Such structures have improved oxygen permeability and are useful in packaging food products such as case ready meat, fish, sausage, fresh produce, and the like that require breathable packages.

대표청구항 ▼

The invention claimed is: 1. An article comprising a multilayer film or sheet which comprises a structure layer, an oxygen permeable layer, and optionally an additional polymer layer whereinthe article is permeable to oxygen;the structure layer is a rigid or semi-rigid layer and the oxygen permeable

The invention claimed is: 1. An article comprising a multilayer film or sheet which comprises a structure layer, an oxygen permeable layer, and optionally an additional polymer layer whereinthe article is permeable to oxygen;the structure layer is a rigid or semi-rigid layer and the oxygen permeable layer comprises or is produced from one or more E/X/Y copolymers or ionomers of the E/X/Y copolymers, one or more organic acids, and optionally one or more ethylene-containing polymers, one or more silicon-containing polymers, or combinations of two or more thereof;E is derived from ethylene, X is derived from at least one C3 to C8 α, β-ethylenically unsaturated carboxylic acid, and Y is an optional comonomer and is derived from a softening comonomer including alkyl acrylate, alkyl methacrylate, or combinations thereof; the alkyl group has from 1 to 8 carbon atoms;the organic acid is an aliphatic acid or salt thereof each having fewer than 36 carbon atoms;the acid moieties in the E/X/Y copolymer and organic acid are nominally neutralized;the structure layer includes cellulose, cellulose derivative, polymer resin, or combinations of two or more thereof;the cellulose derivative is in the form of paper, paperboard, cardboard, pulp-molded shape, or combinations of two or more thereof; andthe polymer resin is in the form of an open-cell foam, melt bonded non-woven porous sheet, or combinations of two or more thereof.