IP Library Granted Patent US 8,980,773
Granted Patent B2
US 8,980,773 · App. 12/687,211 · Granted Mar 17, 2015

Shaped body armor and method of making

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Quick Facts
Patent No.
US 8,980,773
App. No.
12/687,211
Granted
Mar 17, 2015
Kind
B2
Abstract

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.

Claims (10)

1. 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 being a sheet comprising:

(i) at least two nonwoven layers, each of the layers comprising a plurality of nonwoven continuous multifilament polymeric yarns having a linear density of from 50to 4500 dtex, a tenacity of from 10 to 65 g/dtex, a modulus of from 150 to 2700g/dtex, and an elongation to break of from 1 to 8 percent, the yarns in the layers being arranged substantially parallel to each other with the proviso that the yarns in any one layer are offset in orientation with respect to the orientation of yarns of any other layer contacting the any one layer,

(ii) binder of thermoset or thermoplastic film or powder, and

(iii) resin coating not fully impregnating the yarns such that the weight percent of the binder and coating resin is in the range of from 0.5% to 30% when expressed as a percentage of the total weight of resin, binder plus yarn in one of the subassemblies, wherein the subassemblies are free of darts, seams or pleats, wherein

(a) binding threads are stitched through the nonwoven fabric layers of the subassembly, and

(b) the article maintains a depth retention of greater than 50% when a strip of article 254 mm long by 127 mm wide comprising a hemispherical shape having a radius of 51 mm is subjected to two pull stress cycles of up to 400 psi.

2. The article of claim 1 , wherein the yarn polymer is selected from the group consisting of polyamide, polyolefin, polyarenazole or combinations thereof.

3. The article of claim 2 , wherein the polyamide polymer is para-aramid.

4. The article of claim 1 , wherein the coating resin is selected from the group consisting of thermoset, thermoplastic resin or mixtures thereof.

5. The article of claim 1 , comprising from 4 to 60 discrete subassemblies.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 25, 2019
From: E. I. DU PONT DE NEMOURS AND COMPANY
To: DUPONT SAFETY & CONSTRUCTION, INC.
Reel/Frame 049582/0514 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 16, 2010
From: CHIOU, MINSHON J.; DEAKYNE, CLIFFORD K.
To: E. I. DU PONT DE NEMOURS AND COMPANY
Reel/Frame 025367/0095 →