Method to create an environmentally resistant soft armor composite
View Patent ↗Fibrous substrates and articles that retain their superior ballistic resistance performance after exposure to liquids such as sea water and organic solvents, such as gasoline and other petroleum-based products. The fibrous substrates are coated with a multilayer polymeric coating including at least two different polymer layers wherein at least one of the layers is formed from a fluorine-containing polymer.
1. A ballistic resistant fibrous composite comprising at least one fibrous substrate having a multilayer coating thereon, wherein said fibrous substrate comprises one or more fibers having a tenacity of about 7 g/denier or more and a tensile modulus of about 150 g/denier or more; said multilayer coating comprising a first polymer layer on a surface of said one or more fibers, said first polymer layer comprising a first polymer, and a second polymer layer on said first polymer layer, said second polymer layer comprising a second polymer, wherein the first polymer and the second polymer are different, and wherein at least the first polymer comprises fluorine.
2. The ballistic resistant fibrous composite of claim 1 wherein the first polymer comprises fluorine and the second polymer is substantially absent of fluorine.
3. The ballistic resistant fibrous composite of claim 1 wherein the first polymer comprises fluorine and the second polymer comprises fluorine.
4. The ballistic resistant fibrous composite of claim 1 wherein at least one of the first polymer and the second polymer comprises a polychlorotrifluoroethylene homopolymer, a chlorotrifluoroethylene copolymer, an ethylene-chlorotrifluoroethylene copolymer, an ethylene-tetrafluoroethylene copolymer, a fluorinated ethylene-propylene copolymer, perfluoroalkoxyethylene, polytetrafluoroethylene, polyvinyl fluoride, polyvinylidene fluoride, fluorocarbon-modified polyethers, fluorocarbon-modified polyesters, fluorocarbon-modified polyanions, fluorocarbon-modified polyacrylic acid, fluorocarbon- modified polyacrylates, fluorocarbon-modified polyurethanes, or copolymers or blends thereof.
5. The ballistic resistant fibrous composite of claim 1 wherein the second polymer comprises a polyurethane polymer, a polyether polymer, a polyester polymer, a polycarbonate resin, a polyacetal polymer, a polyamide polymer, a polybutylene polymer, an ethylene-vinyl acetate copolymer, an ethylene-vinyl alcohol copolymer, an ionomer, a styrene-isoprene copolymer, a styrene-butadiene copolymer, a styrene-ethylene /butylene copolymer, a styrene-ethylene/propylene copolymer, a polymethyl pentene polymer, a hydrogenated styrene-ethylene/butylene copolymer, a maleic anhydride functionalized styrene-ethylene/butylene copolymer, a carboxylic acid functionalized styrene-ethylene/butylene copolymer, an acrylonitrile polymer, an acrylonitrile butadiene styrene copolymer, a polypropylene polymer, a polypropylene copolymer, an epoxy resin, a novolac resin, a phenolic resin, a vinyl ester resin, a silicone resin, a nitrile rubber polymer, a natural rubber polymer, a cellulose acetate butyrate polymer, a polyvinyl butyral polymer, an acrylic polymer, an acrylic copolymer, an acrylic copolymer incorporating non-acrylic monomers or combinations thereof.
6. The ballistic resistant fibrous composite of claim 1 wherein said fibrous substrate comprises one or more polyolefin fibers, aramid fibers, polybenzazole fibers, polyvinyl alcohol fibers, polyamide fibers, polyethylene terephthalate fibers, polyethylene naphthalate fibers, polyacrylonitrile fibers, liquid crystal copolyester fibers, glass fibers, carbon fibers, rigid rod fibers comprising pyridobisimidazole-2,6-diyl (2,5-dihydroxy -p-phenylene),or a combination thereof.
7. The ballistic resistant fibrous composite of claim 1 which comprises a plurality of fibers in the form of a ballistic resistant fabric.
8. A ballistic resistant article formed from the ballistic resistant fabric of claim 7 .