E.i. Dupont De Nemours and Company

Dupont Safety & Construction, Inc.

Reiyao H Zhu

Richard Hall Young

Vlodek Gabara

Christopher William Newton

Mark Theodore Aronson

Joseph D Trentacosta

Mark William Andersen

B Lynne Wiseman

Thomas Wayne Steinruck

Debbie Guckert

Susan L Lovasic

Larry John Prickett

Yves Bader

Michael W Cobb

Sharlene Renee Williams

Justin W Chan

Roger Parry

Andrew Tadros

Peter A Brown

Michael R Baron

Richard H Young

Mark Gary Weinberg

Richard Young

Processes for forming a yarn comprising a plurality of bicomponent filaments having a first region comprising a first polymer composition and a second region comprising a second polymer composition; the regions being distinct and present in the bicomponent filaments in a sheath-core structure or a side-by-side structure; wherein the first polymer composition comprises aramid polymer comprising 5 to 10 weight percent homogeneously dispersed discrete carbon particles and the second polymer composition comprises aramid polymer being free of discrete carbon particles and having at least one homogeneously dispersed masking pigment, the yarn having a total content of 0.5 to 5 weight percent discrete carbon particles.

Processes for forming carbon-containing aramid bicomponent filament yarns

A yarn comprising a plurality of bicomponent filaments having a first region comprising a first polymer composition and a second region comprising a second polymer composition, each of the first and second regions being distinct in the bicomponent filaments; each bicomponent filament comprising 5 to 60 weight percent of the first polymer composition and 95 to 40 weight percent of the second polymer composition; wherein the first polymer composition comprises aramid polymer containing 0.5 to 20 weight percent discrete homogeneously dispersed carbon particles and the second polymer composition comprises modacrylic polymer being free of discrete carbon particles; the yarn having a total content of 0.1 to 5 weight percent discrete carbon particles.

Process for forming a yarn comprising bicomponent filaments

A yarn comprising a plurality of bicomponent filaments having a first region comprising a first polymer composition and a second region comprising a second polymer composition; the regions being distinct and present in the bicomponent filaments in a sheath-core structure or a side-by-side structure; wherein the first polymer composition comprises aramid polymer containing 0.5 to 20 weight percent homogeneously dispersed discrete carbon particles and the second polymer composition comprises aramid polymer being free of discrete carbon particles and having at least one homogeneously dispersed masking pigment, the yarn having a total content of 0.5 to 5 weight percent discrete carbon particles.

Carbon-containing aramid bicomponent filament yarns

Carbon-containing modacrylic and aramid bicomponent filament yarns

An intimate blend of staple fibers, and a yarn, fabric, and article of clothing providing surprising arc performance; the intimate blend comprises 15 to 70 weight percent modacrylic fiber, 5 to 27 weight percent para-aramid fiber; and 3 to 80 weight percent meta-aramid fiber, wherein 25 to 100 parts of the meta-aramid fiber contains 0.5 to 20 weight percent discrete homogeneously dispersed carbon particles and 0 to 75 parts of the meta-aramid fiber free of discrete carbon particles, the intimate blend having a total content of 0.1 to 3 weight percent discrete carbon particles.

Carbon-containing fiber blends including aramid and modacrylic fiber

An article of thermal protective clothing suitable for use in arc protection comprising a woven fabric comprising yarns comprising modacrylic fiber and aramid fiber, wherein 25 to 100 parts of the aramid fiber contain 0.5 to 20 weight percent discrete homogeneously dispersed carbon particles and 0 to 75 parts of the aramid fiber are free of discrete carbon particles; the fabric having an ATPV of 10 cal/cmor greater at a basis weight of 6 ounces per square yard (203 grams per square meter) or less, and a total content of 0.1 to 3 weight percent discrete carbon particles.

Lightweight fabrics containing carbon-containing aramid fiber blend including modacrylic fiber

An intimate blend of staple fibers, and a yarn, fabric, and article of clothing providing surprising arc performance and coloration capability, comprising a mixture of a first staple fiber made from a flame resistant polymer that retains at least 90 percent of its weight when heated to 425 degrees Celsius at a rate of 10 degrees per minute and comprises 0.5 to 20 weight percent discrete homogeneously dispersed carbon particles; and either (a) a second staple fiber from a flame resistant polymer being free of discrete carbon particles and having an L* lightness coordinate of 70 or greater and being capable of accepting a dye or coloration, or (b) a second staple fiber blend being free of discrete carbon particles and comprising at least one second staple fiber from a flame resistant polymer and having an L* lightness coordinate of 70 or greater and being capable of accepting a dye or coloration; the mixture having a total content of 0.5 to 3 weight percent discrete carbon particles.

Intimate blends of carbon-containing and dyeable fibers

A woven fabric suitable for use in arc protection and article of thermal protective clothing comprising the fabric, the fabric having a warp yarn dissimilar to a fill yarn, wherein a majority of the a face of the fabric is a first yarn and a majority of the opposing face of the fabric is a second yarn, wherein the second yarn comprises 25 to 100 parts aramid fiber containing 0.5 to 20 weight percent discrete homogeneously dispersed carbon particles and 0 to 75 parts aramid fiber free of discrete carbon particles; and wherein the first yarn comprises aramid fiber being free of discrete carbon particles; the fabric having a total content of 0.5 to 3 weight percent discrete carbon particles.

Carbon-containing arc-resistant aramid fabrics from dissimilar yarns

This invention relates to an article of thermal protective clothing having fabric woven with a warp-faced or weft-faced twill weave that incorporates a first yarn forming the majority of the outer article surface that includes hydrophilic fiber and a first flame resistant fiber, with at least 25 weight percent of that first yarn being hydrophilic fiber; and a second yarn forming the majority of the inner article surface that includes at least 80 weight percent of a second flame resistant fiber that is hydrophobic. Alternatively, the first yarn forming the majority of the outer article surface can include a hydrophilic first flame resistant fiber.

Article of thermal protective clothing

This invention relates to a yarn having high moisture regain for use in arc and flame protection and fabrics and garments containing the yarn. The yarn has a blend of fibers which includes 10 to 40 weight percent meta-aramid fiber having a degree of crystallinity of at least 20%, 20 to 60 weight percent modacrylic fiber, 15 to 45 weight percent FR rayon fiber, and (d) 5 to 20 weight percent para-aramid fiber; based on the total weight of these components. If desired, 1 to 3 weight percent of the para-aramid fiber in the yarn can be replaced with an antistatic fiber as long as at least 5 weight percent para-aramid fiber is present.

High moisture regain yarn, fabrics, and garments having superior arc protection

This invention relates to a flame-resistant spun yarn, woven fabric, and protective garment, comprising a blend of 60 to 85 parts by weight of polyoxadiazole staple fiber and 15 to 40 parts by weight modacrylic staple fiber; based on 100 total parts of the polyoxadiazole staple fiber and modacrylic staple fiber in the yarn. This invention also relates to methods for making the yarn.

Yarns of polyoxadiazole and modacrylic fibers and fabrics and garments made therefrom and methods for making same

This invention relates to a flame-resistant spun staple yarns and fabrics and garments comprising these yarns and methods of making the same. The yarns have 20 to 50 parts by weight of a polymeric staple fiber containing a structure derived from a monomer selected from the group consisting of 4,4'diaminodiphenyl sulfone, 3,3&#x2032;diaminodiphenyl sulfone, and mixtures thereof; and 50 to 80 parts by weight of a rigid-rod staple fiber, based on 100 parts by weight of the polymeric fiber and the rigid-rod fiber in the yarn.

Spun staple yarns made from blends of rigid-rod fibers and fibers derived from diamino diphenyl sulfone and fabrics and garments made therefrom and methods for making same

A yarn, fabric, and garment suitable for use in arc and flame protection and having improved flash fire protection consisting essentially of from (a) 50 to 80 weight percent meta-aramid fiber having a degree of crystallinity of at least 20%, (b) 10 to 30 weight percent flame-retardant rayon fiber, (c) 10 to 20 weight percent modacrylic fiber, (d) 0 to 5 weight percent para-aramid fiber, and (e) 0 to 3 weight percent antistatic fiber based on the total weight of components (a), (b), (c), (d), and (e). In one embodiment, garments made from the yarn provide thermal protection such that a wearer would experience less than a 65 percent predicted body burn when exposed to a flash fire exposure of 4 seconds per ASTM F1930, while maintaining a Category 2 arc rating.

Crystallized meta-aramid blends for flash fire and arc protection having improved comfort

A yarn, fabric, and garment suitable for use in arc and flame protection and having improved flash fire protection, consisting essentially of (a) 50 to 60 weight percent meta-aramid fiber having a degree of crystallinity of at least 20%; (b) 31 to 39 weight percent modacrylic fiber; and (c) 5 to 15 weight percent para-aramid fiber; said percentages on the basis of components (a), (b), and (c). In some embodiments, 1 to 3 weight percent of the meta-aramid fiber is replaced with an antistatic fiber comprising carbon or metal with the proviso that at least 50 weight percent meta-aramid fiber is maintained. Garments made from the yarns provide thermal protection such that a wearer would experience less than a 65 percent predicted body burn when exposed to a flash fire exposure of 4 seconds per ASTM F1930, while maintaining a Category 2 arc rating per ASTM F1959 and NFPA 70E.

Crystallized meta-aramid blends for improved flash fire and superior arc protection

A yarn, fabric, and garment suitable for use in arc and flame protection comprising aramid fiber and modacrylic fiber wherein the modacrylic fiber has less than 1.5 percent antimony and is preferably antimony-free. In one embodiment, the yarn, fabric, and/or garments consist essentially of (a) 50 to 80 weight percent meta-aramid fiber having a degree of crystallinity of at least 20%, (b) 10 to 40 weight percent modacrylic fiber that is antimony-free, (c) 5 to 20 weight percent para-aramid fiber, and (d) 1 to 3 weight percent antistatic fiber, based on the total weight of components (a), (b), (c) and (d). In some embodiments, garments made from the yarns provide thermal protection such that a wearer would experience less than a 65 percent predicted body burn when exposed to a flash fire exposure of 4 seconds per ASTM F1930, while maintaining a Category 2 arc rating per ASTM F1959 and NFPA 70E.

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Midlothian, VA, United States of America

Reiyao H Zhu