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US 2007/0190166 A1Published application
Processes for making selectively permeable laminates
AssigneeE. I. Du Pont de Nemours and Company
InventorsEdward Howard, Ralph Lloyd, Ronald McKinney, Bryan Sauer, Mark Weinberg
Life of this patent
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Abstract
Processes for fabricating selectively permeable laminates are provided. In various embodiments, the laminates are useful for fabrication as a protective article and are substantially impermeable to hazardous chemical and biological agents, but sufficiently permeable to water vapor that, if worn as protective apparel, it is both protective and comfortable to wear.
Claims18
A process for fabricating a selectively permeable laminate, comprising:
- (a) forming a solution of a chitosan moiety,
- (b) depositing a quantity of the chitosan solution sufficient to form a film on a substrate, wherein the substrate is essentially without protrusions above the plane of the substrate that are higher than the desired thickness of the coating of chitosan that will be transformed into the film;
- (c) drying the deposited chitosan solution on the substrate, thereby forming a chitosan film;
- (d) optionally, depositing an additional layer onto the chitosan film;
- and
- (e) forming a laminate comprising the substrate and the chitosan film and at least one layer of fabric.
3 more elements
A process for fabricating a selectively permeable laminate, comprising:
- (a) forming a solution of a chitosan;
- (b) depositing on a work device a quantity of such solution sufficient to form a film;
- (c) drying the deposit of chitosan solution on the work device, thereby forming a chitosan film;
- (d) optionally, depositing an additional layer onto the chitosan film;
- (e) removing the film from the work device;
- and
- (f) forming a laminate comprising the film and at least one layer of fabric.
4 more elements
Dependencies are inferred from the claim text.