Multilayered barrier structures
AssigneeMinnesota Mining and Manufacturing Company
InventorsDebra L. Wilfong, Richard J. Rolando
Life of this patent
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Abstract
Multilayered barrier structures comprising a gas barrier layer of a non-chlorine containing organic polymer which is substantially impermeable to oxygen gas and a moisture barrier layer of a mesophase propylene-based material are provided. These structures are environmentally compatible and radiation resistant, and exhibit one or more additional properties, including gas barrier properties, moisture barrier properties, toughness, heat sealability, softness, and quietness during wrinkling. Also provided are methods of preparing and using such multilayered barrier structures, and articles, such as films, pouches, and tubings, formed from these structures.
Claims55
A multilayered structure comprising:
- (a) a gas barrier layer having opposing sides, and comprising a non-chlorine containing organic polymer which is substantially impermeable to oxygen gas;
- and
- (b) at least one moisture barrier layer comprising a mesophase propylene-based material contacting at least one of the sides of the gas barrier layer.
A radiation resistant article formed from a multilayered structure comprising:
- (a) a gas barrier layer having opposing sides, and comprising a non-chlorine containing organic polymer which is substantially impermeable to oxygen gas;
- and
- (b) at least one moisture barrier layer comprising a mesophase propylene-based material contacting at least one of the sides of the gas barrier layer, wherein the article is quenched immediately after being melt extruded.
A multilayered structure comprising:
- a gas barrier layer having opposing sides, and comprising a non-chlorine containing organic polymer selected from the group consisting of ethylene vinyl alcohol copolymer, poly(vinyl alcohol) copolymer, polyacrylonitrile, polystyrene, polyester, nylon, and combinations thereof, wherein the non-chlorine containing organic polymer exhibits a permeability to oxygen gas of less than about 150 cc/m.sup.2 /d-atm at 25.degree. C. and 0% relative humidity;
- and
- at least one moisture barrier layer comprising a mesophase propylene-based material selected from the group consisting of mesomorphous polypropylene, a mesopolymer blend, a mesocopolymer, and combinations thereof, contacting at least one of the sides of the gas barrier layer.
A multilayered structure comprising:
- a gas barrier layer having opposing sides, and comprising a non-chlorine containing organic polymer selected from the group consisting of ethylene vinyl alcohol copolymer, poly(vinyl alcohol) copolymer, polyacrylonitrile, polystyrene, polyester, nylon, and combinations thereof, wherein the non-chlorine containing organic polymer exhibits a permeability to oxygen gas of less than about 100 cc/m.sup.2 /d-atm at 25.degree. C. and 0% relative humidity;
- and
- at least one moisture barrier layer comprising a mesophase propylene-based material selected from the group consisting of mesomorphous polypropylene, a mesopolymer blend, a mesocopolymer, and combinations thereof, wherein the gas barrier layer and moisture barrier layer are coextruded as a multilayered film or tube.
Dependencies are inferred from the claim text.