E.i. Dupont De Nemours and Company

Minshon J Chiou

Hung H Yang

Bryan Benedict Sauer

Kalika Ranjan Samant

Joseph D Trentacosta

Larry John Prickett

Leopoldo Alejandro Carbajal

Clifford K Deakyne

Louis H Miner

Nicolas A Van Zijl

Brian Emmett Foy

Patrick F Fitzgerald

James C Davis

Jianrong Ren

Louis Henry Miner

The invention concerns multiaxial fabrics comprising a first layer comprising a plurality of first yarns being substantially parallel in a first direction; a second layer comprising a plurality of second yarns being substantially parallel in a second direction and skew of off-set with respect to the first yarns; a third yarn layer comprising a plurality of third yarns being substantially parallel in a third direction and skew of off-set with respect to the first yarns and second yarns; a fourth yarn layer comprising a plurality of fourth yarns being substantially parallel in a fourth direction and skew of off-set with respect to the first, second and third yarns; at least one fiber network layer; and a transverse yarn interlaced transversely within the multiaxial fabric where each layer may be arranged in any sequential order and optionally coated with a high viscosity polymer that has a glass transition temperature Tg in the range of about &#x2212;40 to about 0&#xb0; C., and a zero shear melt viscosity of about 2&#xd7;10to about 10poise at 20&#xb0; C.

Multiaxial fabric for ballistic applications

This invention pertains to an article for use in body armor, comprising a plurality of discrete sheet subassemblies contoured to the shape of a female breast arranged in a stack, without bonding, such that the breast contours are positioned on top of each other, each of the subassemblies comprising at least two nonwoven layers of high tenacity yarns such as par-aramid, a binder and a resin.

Shaped body armor and method of making

The invention concerns multiaxial fabrics comprising a first layer comprising a plurality of first yarns being substantially parallel in a first direction, a second layer comprising a plurality of second yarns being substantially parallel in a second direction and skew or off-set with respect to the first yarns, transverse yarn interlaced transversely within the layers; wherein each layer is coated with a high viscosity polymer that has a Tg in the range of about &#x2212;40 to about 0&#xb0; C., and a zero shear viscosity of about 2&#xd7;10to about 10poise at 20&#xb0; C.

Multiaxial fabric with strain-responsive viscous liquid polymers

Provided is a multiaxial fabric comprising a first layer comprising a first layer comprising substantially parallel resin-free polyethylene yarns oriented in a first direction; a second layer comprising substantially parallel resin-free polyethylene oriented in a second direction, the first and second directions being skew with respect to each other; a layer, interposed between and in contact with each of the first and second layers, and comprising a thermoplastic or thermoset film; and a yarn interlaced transversely among each of the layers of the multiaxial fabric.

Multiaxial polyethylene fabric and laminate

Provided are non-woven constructions and fabrics comprising polypyridazole short fiber; the short fiber characterized by an average filament tenacity of at least 15 grams per denier; an average filament modulus of at least 500 grams per denier; an average filament density of at least 1.6 grams per cubic centimeter; an average filament length of 30 to 100 millimeters; and an average filament denier per filament of 0.1 to 10; wherein the construction is substantially free of matrix.

Matrix free non-woven layer of polypyridazle short fiber

The present invention relates to body armor articles for resisting ballistic objects. The articles comprise woven fabric layers and sheet layers. The woven fabric layers are made from yarns having a tenacity of at least 7.3 grams per dtex and a modulus of at least 100 grams per dtex. The sheet layers comprise non-woven random oriented fibrous sheets and/or non fibrous films. The woven fabric layers and the sheet layers are stacked together comprising a first core section which includes at least two repeating units of, in order, at least one of the woven fabric layers then at least one of the sheet layers. The sheet layers comprise 0.5 to 30 wt % of the total weight of the article.

Ballistic resistant body armor articles

A penetration resistant article with an area density less than 1.5 lb/ftmade of a plurality of fibrous fabric layers that have applied thereto about 1 to 8 percent by weight of a polymer having a glass transition temperature in the range of minus 40 to about 0&#xb0; C. and a zero shear melt viscosity 2&#xd7;10to about 10poise at 20&#xb0; C.

Fabrics with strain-responsive viscous liquid polymers

The invention concerns a penetration resistant article comprising a plurality of substantially planar elements; each element comprising at least one fibrous layer formed of multifilaments having a linear density of at least 200 dtex, a tenacity of at least 10 grams per dtex, and an elongation to break of at least 2%; and superposed upon at least one of the fibrous layers, a polymer layer comprising a thermoplastic polymer, a thermoset polymer, or a polymer having glass transition temperature of &#x2212;40&#xb0; C. to 0&#xb0; C., a molecular weight (Mw) of 20,000 to 100,000, and a viscosity of about 2&#xd7;10to about 10poise at 20&#xb0; C.; the polymer layer covering and being adhered to from 25% to 75% of the area of the fibrous layer, wherein the area not covered by the polymer layer comprises a plurality of discrete areas.

Flexible ballistic fabric and articles made therefrom

Multiaxial fabrics contain at least one layer of nonwoven fabric, thermoplastic film or thermoset film, a first layer containing a plurality of first yarns being substantially parallel in a first direction, a second layer containing a plurality of second yarns being substantially parallel in a second direction and skew or off-set with respect to the first yarns, and transverse yarn interlaced transversely within the layers wherein each layer may be arranged in any sequential order and optionally coated with a high viscosity polymer that has a Tg in the range of about &#x2212;40 to about 0&#xb0; C., and a zero shear melt viscosity of about 2&#xd7;10to about 10poise at 20&#xb0; C.

Multiaxial fabric

A process of treating a woven fabric by applying to the fabric a viscous polymer in a 5 to 40 wt % solution with a solvent, wherein the polymer has a Tin the range of about minus 40 to about 0&#xb0; C. and a zero shear melt viscosity of about 2&#xd7;10to about 10poise when measured at 20&#xb0; C. and then evaporating the solvent such that the polymer only partially penetrates the fabric and penetrates to in and between fiber bundles before the polymer solidifies.

Method for treating fabric with viscous liquid polymers

The invention relates to a flexible, penetration resistant article comprising a plurality of fibrous layers including continuous filament yarns, and having an areal density of less than about 4.4 kilograms per square meter. At least one of the plurality of fibrous layers has a fiber with a tenacity of at least about 30 grams per decitex and a continuous filament yarn having a linear density of less than about 1100 decitex.

Flexible penetration resistant article

An article is disclosed to protect a wearer from spike and ballistic threats that is made from a spike resistant panel and a ballistic resistant panel. Each panel is made from flexible fabric layers. The fabrics in the spike resistant panel are made from first yarns having a linear density of from 50 to 600, with a plurality of filaments. There are 40 to 100 first yarns per inch in both the warp and fill directions. The fabrics in the ballistic resistant panel are made from second yarns having a linear density of from 100 to no more than 840 denier with a plurality of filaments, which provide from 20,000,000 to no more than 90,000,000 filament crossovers per square inch. There are 5 to less than 40 second yarns per inch in both the warp and fill directions

Flexible spike/ballistic penetration-resistant articles

The present invention relates to penetration resistant life protection articles, including spike penetration resistant life protection articles, and preferably spike and ballistic projectile penetration resistant life protection articles.

Penetration resistant life protection articles

The present invention relates to multiple threat penetration resistant articles. The articles include, in order, fabric layers, polymer impregnated fabric layers, and woven fabric layers. The articles can additionally include tightly woven fabric layers which define the strike face of the article.

Multiple threat penetration resistant articles

A flexible ballistic resistant article is disclosed that includes a plurality of layers of fabric having an areal density of 2 to 10 kg/m , wherein at least two of the layers of fabric are loosely woven. The loosely woven fabric layers include fabric woven with a fabric tightness factor of 0.3 to 0.6 and are made using continuous filament yarns with a linear density of at least 200 dtex, a tenacity of at least 10 grams per dtex and a tensile modulus of at least 150 grams per dtex. Adjacent loosely woven fabric layers are joined together by means for securing the layers to restrict the movement of the loosely woven fabric layers relative to one another.

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Chesterfield, VA, United States of America

Minshon J Chiou