Breathable protective apparel

Patent metadata

Field	Value
Publication number	US-9809004-B2
Application number	US-201514797530-A
Country	US
Kind code	B2
Filing date	Jul 13, 2015
Priority date	Jul 18, 2014
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

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.

First claim

We claim:

1. 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.

2. The structure of claim 1 in which the adhesive is located at multiple discrete points on the plexifilamentary web.

3. The structure of claim 2 in which the adhesive comprises carbon based powders, micro-powders, nanotubes and carbon fiber fragment components, or any combination thereof.

4. The structure of claim 2 in which the adhesive comprises reactive tracers.

5. The structure of claim 1 in which the polyolefin polymer is selected from the group consisting of LDPE, LLDPE, HDPE, PP, and any combination thereof.

6. A protective garment comprising the structure of claim 1 .

Assignees

• Du Pont

Inventors

• Nowak Stephane
• Rebouillat Serge

Classifications

• B32B27/32

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title

• B32B27/12

  next to a fibrous or filamentary layer · CPC title

• B32B2262/0253

  Polyolefin fibres · CPC title

• B32B7/14 Primary

  applied in spaced arrangements, e.g. in stripes · CPC title

• B32B5/022

  Non-woven fabric · CPC title