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Chemical protective covering

A protective, covering technology, applied in the field of materials and products, can solve the problem of non-representation

Inactive Publication Date: 2003-08-06
WL GORE & ASSOC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the chemical permeability of each of these materials was evaluated at low relative humidity and is not representative of the wide range of conditions encountered in use

Method used

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  • Chemical protective covering
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] WVTR (g / (m 2 ·sky))

[0123] The sample adding the amine-acid moiety derived from sulfuric acid increased the water vapor transmission rate by a factor of 1.80 and decreased the permeability to 2CES at 80% relative humidity to 6.67 compared to the sample without the amine-acid moiety one-third. This is an example of achieving improved protection and improved breathability even at high relative humidity. The permeability to 2CES at 50% relative humidity was at or below the lower limit of detection for both samples.

Embodiment 2

[0125] WVTR (g / (m 2 ·sky))

[0126] The sample with added amine-acid moiety derived from phosphoric acid has a water vapor transmission rate of about 70% of that of the sample without the amine-acid moiety, while the permeability to 2CES drops to less than 1.5% of the sample without the amine-acid moiety. This is an example of a very significant improvement in protection even at high relative humidity with much less impairment of breathability. The permeability to 2CES at 50% relative humidity was at or below the lower limit of detection for both samples.

Embodiment 3

[0128] WVTR (g / (m 2 ·sky))

[0129] The sample adding the amine-acid moiety derived from sulfuric acid increased the water vapor transmission rate by a factor of 2.24 and decreased the permeability to 2CES at 80% relative humidity to 2.34 compared to the sample without the amine-acid moiety one-third. This is another example of improved protection while improving breathability. The permeability to 2CES at 50% relative humidity was at or below the lower limit of detection for both samples.

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Abstract

This invention provides a selectively permeable protective covering capable of transmitting high quantities of water vapor while also being capable of significantly restricting the passage of noxious or harmful chemicals even under conditions of high humidification. The material of this invention provides the basis for creating protective garments and accessories suitable for application in the broad range of conditions likely to be encountered in realistic use scenarios. In its broadest aspect, the protective and water vapor permeable covering of this invention comprises a sheet of a polyamine polymer wherein at least 10 % of the polyamine polymer amines are amine-acid moieties wherein the acidic species of said amine-acid moieties have a pKa less than 6.4.

Description

field of invention [0001] The present invention relates to chemical protective coverings. More particularly, the present invention relates to materials and articles that can be used to provide protection to the human body or contents from toxic or harmful chemicals in vapor, aerosol or particulate form. The chemical protective coverings provided by the present invention are particularly suitable for use in articles such as garments, tents, sleeping bags and the like. background of the invention [0002] Chemical protective coverings are used to prevent harmful amounts of chemicals present in the external environment from reaching the user or wearer of the material or the contents. [0003] Wear chemical protective clothing when the surrounding environment may present a potential hazard for exposing the individual to harmful or toxic chemicals. Historically, materials used in protective clothing have had to choose protection over comfort. That is, those materials that prov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A41D13/00A41D31/00A62D5/00B32B27/00
CPCA62D5/00Y10T428/249987Y10T428/8305Y10T428/249955Y10T428/249991Y10T428/249981Y10T428/249958
Inventor A·B·梅普尔斯
Owner WL GORE & ASSOC INC