Method of forming 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 containing 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.
Claims15
A method for forming a multilayered structure comprising:
- coextruding a propylene-based material along with a nonchlorine containing organic polymer which is substantially impermeable to oxygen gas to form a multilayered extrudate;
- and
- quenching the multilayered extrudate immediately after extruding to provide a multilayered structure with a core layer of the non-chlorine containing organic polymer and at least one layer of a mesophase propylene-based material proximate the core layer.
A method for forming a multilayered structure comprising:
- coextruding a propylene-based material selected from the group consisting of mesomorphous polypropylene, a mesopolymer blend, a mesocopolymer, and combinations thereof along with a nonchlorine containing organic polymer which exhibits a permeability to oxygen gas of less than 100 cc/m.sup.2 /d-atm at 25.degree. C. and 0% relative humidity to form a multilayered extrudate;
- quenching the multilayered extrudate at a temperature of less than about 38.degree. C. immediately after extruding to provide a multilayered structure with a core layer of the non-chlorine containing organic polymer and at least one layer of a mesophase propylene-based material proximate the core layer;
- and
- affixing a fabric backing selected from the group consisting of a woven material, a nonwoven material, and combinations thereof to at least a portion of the multilayered structure;
- and
- assembling the multilayered structure into an ostomy pouch, wherein the fabric backing provides a comfortable surface for contacting the skin of a wearer of the ostomy pouch.
Dependencies are inferred from the claim text.