Flash spun plexifilamentary strands and sheets
AssigneeE. I. Du Pont de Nemours and Company
InventorsJan Van Meerveld, Corneille Schmitz, Joseph Mathieu, Noel Stephen Brabbs, Orest Skoplyak, Christine Lemoine, Serge Rebouillat
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Abstract
A flash-spun plexifilamentary fiber strand having a BET surface area of less than 12 m2/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.
Claims3
A thermally or mechanically consolidated sheet comprising a flash-spun plexifilamentary fiber strand comprising fibers having a total crystallinity index of less than or equal to 55%, the flash-spun plexifilamentary fiber strand having a BET surface area of less than or equal to 12 m2/g and a crush value of greater than or equal to 0.9 mm/g,
- wherein said fiber strand comprises predominantly said fibers, and said fibers are formed from homopolymers of ethylene and have a monoclinic and orthorhombic structure as determined by X-ray characterization and a crystallinity index of the monoclinic structures is higher than 1%;
- the sheet resulting from a flash spinning process utilizing a spin agent medium comprising a mixture of i) and ii), wherein
- i) is dichloromethane or trans-1,2-dichloroethylene;
- and
- ii) is 2,3-dihydrodecafluoropentane, 1,1,1,2,2,3,3,4,4,5,5,6,6-tridecafluorohexane, 1,1,2,2,3,3,4,4,5,5,6,6-dodecafluorohexane, or a hydrofluoroether.
Dependencies are inferred from the claim text.