Intimate fiber blend of poly(m-phenylene isophthalamide) and poly(p-phenylene terephthalamide)
AssigneeE. I. Du Pont de Nemours and Company
InventorWilliam G. Burckel, deceased
Life of this patent
Estimating the term…
Abstract
This invention relates to fiber blends, yarns and fabrics for use in lightweight garments offering protection against brief exposure to extreme thermal fluxes, the fiber blend comprising a component that fuses within 10 seconds upon exposure to a heat flux of 2 cal./cm..sup.2 /sec. and a component that in fabric form exhibits a flame strength of at least 20 mg. per denier for at least 10 seconds during exposure to a heat flux of 2 cal./cm..sup.2 /sec.
Claims3
An intimate blend of organic staple fiber components comprising at least about 15% by weight of a first fiber component consisting of poly(m-phenylene isophthalamide) fibers which in fabric form will meld or fuse within 10 seconds during exposure to a heat flux of 2 cal./cm..sup.2 /sec. and from about 3-20% by weight of a second fiber component consisting of poly(p-phenylene terephthalamide) fibers which in fabric form exhibit a flame strength of at least 20 mg./den. for at least 10 seconds during exposure to a heat flux of 2 cal./cm..sup.2 /sec.
An intimate blend of organic staple fiber components comprising at least about 15% by weight of a first fiber component consisting of poly(m-phenylene isophthalamide) fibers which in fabric form will meld or fuse within 10 seconds during exposure to a heat flux of 2 cal./cm..sup.2 /sec. and from about 3-20% by weight of a second fiber component consisting of poly(p-benzamide) fibers which in fabric form exhibit a flame strength of at least 20 mg./den. for at least 10 seconds during exposure to a heat flux of 2 cal./cm..sup.2 /sec.
Dependencies are inferred from the claim text.