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US 5,308,598 AGranted
Plexifilamentary fibers from pitch
AssigneeE. I. Du Pont de Nemours and Company
InventorDon M. Coates
Life of this patent
Estimating the term…
Abstract
A process is provided for flash-spinning plexifilamentary fiber from pitch. The fibers can be stabilized and graphitized. The flash-spinning requires polyethylene amounting to 0.3 to 3.5% of the spin mixture (4 to 20% in the resultant fiber) for satisfactory plexifilament formation.
Claims5
A process for preparing fibers from pitch comprising
- forming a mixture comprising 7 to 22% by weight pitch, 0.3 to 3.5% polyethylene and 74.5 to 92.7% of organic liquid,
- dispersing the polyethylene and pitch in the organic liquid,
- heating the dispersed mixture to a temperature in the range of 130.degree. to 225.degree. C. while under pressure sufficient to prevent boiling,
- adjusting the pressure to at least 7,000 kPa and
- passing the mixture through an orifice into a region of lower temperature and much lower pressure to cause flash-evaporation of the solvent and formation of a flash-spun plexifilamentary fiber comprising at least 4 and no more than 20% by weight of polyethylene and 96 to 80% pitch.
2 more elements
A graphitized flash-spun plexifilamentary fiber.
Dependencies are inferred from the claim text.