E.i. Dupont De Nemours and Company

Dupont Safety & Construction, Inc.

Joseph Mathieu

Serge Rebouillat

Noel Stephen Brabbs

Corneille Schmitz

Jan Van Meerveld

Orest Skoplyak

Christine Lemoine

A sheet comprising a plexifilamentary film-fibril network consisting essentially of high density polyethylene in an overlapping multi-directional configuration, the sheet, as-produced from a spin cell, having a normalized Frazier air permeability of between 0.002 and 0.2 m/m·minute at 50 gsm, a BET surface area of between 9 and 20 m/gm, and a normalized hydrohead of between 150 and 250 cm at 50 gsm, wherein the plexifilamentary film-fibril network in an overlapping multi-directional configuration is flash-spun from a spin fluid comprising polymer and spin agent, the spin fluid temperature being 190° C. or greater, the spin agent comprising dichloromethane, the spin fluid having a polymer concentration of 12 to 14 weight percent.

Plexifilamentary sheets

A sheet having a plexifilamentary structure with a normalized Frazier air permeability of between 0.002 and 0.2 (m/m&#xb7;minute)@50 gsm, and a normalized hydrohead of between 150 and 250 centimeters@50 gsm.

A flash-spun plexifilamentary fiber strand having a BET surface area of less than 12 m/g, a crush value of at least 0.9 mm/g wherein said fiber strand comprises predominantly fibers formed from polyethylene, said fibers having a total crystallinity index of less than 55%, said fiber strand having an elongation at break greater than 55% and sheets made thereof.

Flash spun plexifilamentary strands and sheets

A flash-spun plexifilamentary fiber strand having a BET surface area of less than 12 m/g, a crush value of at least 0.9 mm/g wherein said fiber strand comprises predominantly fibers formed from polyethylene, said fibers having a total crystallinity index of less than 55%, and sheets made thereof.

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Esch-sur-Alzette, Luxembourg

Joseph Mathieu