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US 9,809,004 B2Granted
Breathable protective apparel
AssigneeE. I. Du Pont de Nemours and Company
InventorsStephane Nowak, Serge Rebouillat
Life of this patent
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Abstract
A laminated structure containing a microporous film bonded in a face to face relationship with a plexifilamentary nonwoven web with an adhesive layer situated in contact with a least a portion of both the microporous film and the nonwoven web. The adhesive may contain reactive tracers.
Claims6
A laminated structure consisting of a microporous film bonded in a face to face relationship with a plexifilamentary nonwoven web with an adhesive layer situated in contact with a least a portion of both the microporous film and the nonwoven web, wherein;
- the film contains filler consisting of calcium carbonate, clay, titanium dioxide, barium sulfate or any combination thereof in an amount between 30% and 50% by weight of the total film weight, and between 40% and 90% of polyolefin polymer by weight of the total film weight,
- the film has a thickness of between 12 and 25 microns,
- the film is bonded to the plexifilamentary web by adhesive,
- the laminated structure has a water vapor transmission rate (WVTR) as measured by the EN ISO 12572 Climate C method of greater than or equal to 1000 g/m2/day,
- the basis weight of the laminated structure is at least 55 g/m2,
- the tensile strength of the laminated structure according to EN ISO 13934-1 is at least 35 Newtons in the machine direction,
- the tensile elongation of the laminated structure according to EN ISO 13934-1 is at least 8% in the machine direction,
- the tensile strength of the laminated structure according to EN ISO 13934-1 is at least 35 Newtons in the cross direction,
- the tensile elongation according to EN ISO 13934-1 is at least 15% in the cross direction, and
- the laminated structure has a hydrohead according to EN 20811 of at least 200 cm of water.
7 more elements
Dependencies are inferred from the claim text.