Composite comprising a nonwoven vapor permeable sheet

Patent metadata

Field	Value
Publication number	US-10895036-B2
Application number	US-201716086388-A
Country	US
Kind code	B2
Filing date	May 11, 2017
Priority date	May 18, 2016
Publication date	Jan 19, 2021
Grant date	Jan 19, 2021

Abstract

A composite laminate comprising at least one moisture vapor permeable nonwoven sheet having first and second surfaces and a fluorinated polymeric coating on the first surface of the sheet wherein (i) the fluorinated polymeric coating is present in an amount such that the total fluorine content of the coated non-woven sheet is 0.05 to no greater than 0.4 gsm, and (ii) the composite laminate, after exposure to wet timber, exhibits a retained hydrohead of at least 60 percent.

First claim

What is claimed is:

1. A composite laminate comprising at least one moisture vapor permeable nonwoven sheet having first and second surfaces and a fluorinated continuous polymeric coating on the first surface of the sheet wherein
(i) the fluorinated polymeric coating is present in an amount such that the total fluorine content of the coated non-woven sheet is from 0.05 gsm to no greater than 0.4 gsm, and
(ii) the composite laminate, after exposure to wet timber, exhibits a retained hydrohead of at least 60 percent when tested according to Test Method A.

2. The nonwoven sheet of claim 1 wherein the sheet comprises plexifilamentary polyolefin fibers.

3. The nonwoven sheet of claim 2 wherein the polyolefin is polyethylene or polypropylene.

4. The composite laminate of claim 1 further comprising a layer of metal intermediate between the first surface of the polyolefinic sheet and the fluorinated continuous polymeric coating, the laminate having an emissivity no greater than 0.25.

5. The composite laminate of claim 4 wherein the metal is aluminum, tin, zinc, titanium nickel, gold, silver, lead, copper or alloys thereof.

6. The composite laminate of claim 4 wherein the metal is aluminum.

7. The composite laminate of claim 4 further comprising an anticorrosion layer deposited between the metal layer and the fluorinated continuous polymeric coating.

8. A building structure comprising a wall or roofing system comprising wooden sheet board or planks and a composite laminate of claim 1 wherein the polymeric coating is in contact with the wooden board or planks.

Assignees

• Dupont Safety & Construction Inc

Inventors

• Brabbs Noel Stephen
• Huebsch Eric
• Frey Norbert

Classifications

• D06N2209/123

  Breathable · CPC title

• B32B5/022

  Non-woven fabric · CPC title

• E04D13/16

  Insulating devices or arrangements in so far as the roof covering is concerned, {e.g. characterised by the material or composition of the roof insulating material or its integration in the roof structure} · CPC title

• E04B1/625

  Sheets or foils allowing passage of water vapor but impervious to liquid water; house wraps · CPC title

• Y10T428/24917

  including metal layer · CPC title