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US 2008/0176468 A1Published application
Selectively permeable protective structure and articles therefrom
AssigneeE. I. Du Pont de Nemours and Company
InventorJohn Chu Chen
Life of this patent
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Abstract
An article comprising a selectively permeable membrane supported on a support is disclosed wherein the article has moisture vapor transmission rate of at least 1800 g/m2/24 h and the selectively permeable membrane comprises a composition comprising an organic acid-modified ionomer.
Claims21
An article comprising a substrate and a selectively permeable membrane wherein
- the article is selectively permeable to moisture having a moisture vapor transmission rate, measured according to ASTM F2298, of at least 1800 g/m2/24 h;
- the substrate comprises textile or porous sheet material;
- the membrane comprises or is produced from a composition that comprises or is produced from an organic acid-modified ionomer and optionally a non-ionomeric polymer;
- the organic acid-modified ionomer comprises one or more E/X/Y copolymers and an organic acid or salt thereof where E is derived from ethylene, X is derived from at least one C3-C8 α,β-ethylenically unsaturated carboxylic acid, and Y is derived from a softening comonomer;
- at least 60% of the acid moiety in the E/X/Y copolymer and organic acid is neutralized with an alkali metal;
- and
- the softening comonomer includes an alkyl (meth)acrylate.
4 more elements
An article comprises a substrate having impregnated therein, incorporated therein, or laminated thereon a selectively permeable composition or membrane wherein
- the composition or membrane is selectively permeable to moisture having a moisture vapor transmission rate, measured according to ASTM F2298, of at least 1.800 Kg/m2/24 h;
- the substrate comprises textile or porous sheet material;
- the composition or membrane comprises or is produced from a composition that comprises or is produced from an organic acid-modified ionomer and optionally a non-ionomeric polymer;
- the organic acid-modified ionomer comprises one or more E/X/Y copolymers and an organic acid or salt thereof where E is derived from ethylene, X is derived from at least one C3-C8 α,β-ethylenically unsaturated carboxylic acid, and Y is derived from a softening comonomer;
- at least 90% of the acid moiety in the E/X/Y copolymer and organic acid is neutralized with an alkali metal;
- and
- the softening comonomer includes an alkyl (meth)acrylate.
4 more elements
Dependencies are inferred from the claim text.