Liquid water resistant and water vapor permeable garments comprising hydrophobic treated nonwoven made from nanofibers

A technology of nanofibers and nanofiber layers, which can be used in non-woven fabrics, protective clothing, textiles and papermaking, and can solve problems such as low air permeability and discomfort

Active Publication Date: 2010-01-13
DUPONT SAFETY & CONSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Microporous films have been used in barrier materials to achieve extremely high hydrostatic head barrier performance, but at the expense of breathability, making them unacceptably low, resulting in fabrics containing such films that are uncomfortable for the wearer. feel unwell

Method used

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  • Liquid water resistant and water vapor permeable garments comprising hydrophobic treated nonwoven made from nanofibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0034] hydrostatic head or "Static Head" (ISO 811) is a convenient measure of a fabric's ability to penetrate water against water. It is expressed in centimeters of water column (cmwc) required to force liquid water through the fabric. It is known that the static head depends on the inverse of the pore diameter. Smaller pore sizes produce higher static head, while larger pore sizes produce lower static head. In the following measurements, a ramp rate of 60 cmwc per minute was used.

[0035] Fraser air permeability It is measured according to ASTM D737. In this measurement, 124.5 N / m is applied to a properly clamped fabric sample 2 (0.5 inches of water column) pressure difference, the resulting air flow rate is measured and expressed in m 3 / min / m 2 Make a note.

[0036] moisture vapor transmission rate ("MVTR") is measured in accordance with ASTM E96 B and is expressed in units of g / m 2 / day for recording.

[0037] Contact angle Measured using a Video Contact A...

Embodiment 1

[0044] Prepare the nanofiber layer in the same manner as above and use 7040, the difference is that melamine formaldehyde resin ( 2003 from Bercen, Inc., Cranston, Rhode Island). The ratio of 7040 to melamine formaldehyde resin is about 3:1.

[0045] The treated nanofiber layer was placed in a test fixture, and then the properties were measured according to the method in Comparative Example 1. The static pressure head, Frazier air permeability and moisture vapor transmission rate of the nanofiber layer were measured, and the measurement results are shown in Table 1.

[0046] Two samples of the nanofibrous layer were prepared, and then three contact angle measurements were made for each sample according to the method in Comparative Example 1. The measurement results are shown in Table 1.

[0047] Table 1

[0048] Example

[0049] As can be seen from the data, the treatment bath containing melamine formaldehyde resin significantly increased the hydrostatic he...

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Abstract

A water resistant garment is disclosed having regions of high MVTR while maintaining water resistance. The garment has a fabric layer adjacent one major surface of a nanofiber layer. The surface of the nanofibers are coated with a coating containing a fluorocarbon polymeric moiety and a resin binder or extender which is soluble in water and / or other solvents. The coated nanofiber layer has a contact angle of greater than 145 DEG . The garment optionally includes a second fabric layer adjacent the other major surface of the nanofiber layer. The garment has regions having a Frazier air permeability of between about 0.5 m<3> / min / m<2 >and about 8 m<3> / min / m<2>, an MVTR of greater than about 500 g / m<2> / day and a hydrostatic head of at least about 50 cmwc.

Description

field of invention [0001] The present invention relates to garments with controlled moisture vapor and liquid water management capabilities. The invention as claimed and disclosed has particular application in waterproof garments. Background of the invention [0002] Protective clothing worn in rain and other wet conditions should be able to keep the wearer dry by preventing moisture from penetrating into the garment (i.e. "waterproof") and by allowing sweat to evaporate from the wearer to the atmosphere (i.e. "breathable") . [0003] Fabrics treated with silicones, fluorocarbons, and other water repellents generally allow perspiration to evaporate but have limited repellency; water penetrates these fabrics at very low pressure and often leaks spontaneously when rubbed or mechanically flexed. Raincoats must be able to withstand the brunt of rain and storms, and withstand the stresses created in the folds and creases of clothing. [0004] It is widely recognized that comfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A41D31/02D04H13/00D04H1/72D04H1/728
CPCA41D2500/30A41D2400/20A41D31/02D04H13/002A41D2400/22A41D31/102Y10T442/2139A41D31/145B32B3/26
Inventor R·A·马林J·A·孔利F·T·威尔逊
Owner DUPONT SAFETY & CONSTR INC
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