Composite sheet and cargo container comprising same

1. A non-rigid composite sheet comprising in order

(i) a first component having an areal weight of from 88 to 678 gsm comprising a first fabric of continuous filament yarns, the yarns having a tenacity of at least 11 g/dtex and a first polymeric layer,

(ii) a second component comprising at least one second fabric of continuous filament glass yarns, the second fabric being a woven fabric having an areal weight of from 170 to 339 gsm and adjacent to the first fabric of the first component, and

(iii) a third component comprising a second polymeric layer,

 wherein

(a) the first fabric is a woven fabric having an areal weight of from 70 to 508 gsm comprising yarns of aromatic polyamide, aromatic copolyamide, glass fiber or carbon fiber,

(b) the polymer of the first and second polymeric layers is polyurethane, polyethylene, polypropylene, polyethylenenaphthalate, polyacrylonitrile, fluoropolymer, polyimide, polyketone, polyimide, polysulfone, polyarlene sulfide, liquid crystal polymer, polycarbonate or an ionomer, and

(c) when the second fabric is free of a polymeric coating, the fabric has a flame barrier cover of at least 90% when measured over a minimum area of 645 sq. mm. of fabric surface, an areal weight of at least 136 gsm and the fabric comprises fiber having a nominal filament tensile strength of at least 3.4 GPa, or when the second fabric further comprises a polymeric coating on the surface of, or impregnated into the fabric, the coated fabric has a flame barrier cover of at least 90% when measured over a minimum area of 645 sq. mm. of fabric surface, an areal weight of at least 30 gsm and the fabric comprises fiber having a having a nominal filament tensile strength of at least 3.4 GPa and the polymeric coating is present in an amount of from 20 to 50 weight percent of the fabric weight with the proviso that, when the fabric prior to coating has a flame barrier cover of less than 90% and/or the fabric weight prior to coating is less than 135 gsm, then the coating weight is at least 50 gsm.

2. The composite of claim 1 wherein the polymer of the polymer coating of the second component is polyureasilazane, polycarbosilane, polysilazane, polysiloxane or silicon-carboxyl resin.

3. The composite of claim 1 wherein the third component further comprises a third woven fabric of continuous filament yarns having a yarn tenacity of at least 11 g/dtex, the third fabric being adjacent to the second fabric of the second component, the third fabric further having an areal weight of from 70 to 508 gsm and comprises yarns of aromatic polyamide, aromatic copolyamide, glass fiber or carbon fiber.

4. The composite of claim 1 , wherein second component further comprises an inorganic refractory material on the surface of, or impregnated into, the second fabric, the refractory material being present in an amount of from 3 to 10 weight percent of the second fabric.

5. The composite of claim 1 , wherein the sheet can withstand a flame temperature of 927 degrees C. for 5 minutes without burn-through penetration.

6. The composite of claim 1 , wherein the sheet can withstand a flame temperature of 927 degrees C. for 5 minutes without burn-through penetration and the temperature 101 mm away from the side of the sheet remote from the flame does not exceed 204° C.

7. The composite of claim 1 , wherein the composite sheet has a break strength of at least 350 N/cm (200 lb. per in.).

8. The composite of claim 1 wherein the fluoropolymer of the first or second polymeric layer is polyvinyl fluoride.

9. The composite of claim 1 , wherein the first fabric has an areal weight from 101 to 170 gsm and the third fabric has an areal weight from 170 to 270 gsm.

10. The composite of claim 9 , wherein the first fabric has an areal weight from 101 to 373 gsm.

11. A cargo container comprising a frame assembly, a plurality of side walls, a ceiling and a floor wherein the sidewalls and ceiling comprise the non-rigid composite sheet of claim 1 .

12. A fire-resistant cover, separator, blanket or liner comprising the non-rigid composite sheet of claim 1 .

13. A non-rigid composite sheet comprising in order

(i) a first component having an areal weight of from 88 to 678 gsm comprising a first fabric of continuous filament yarns, the yarns having a tenacity of at least 11 g/dtex and a first polymeric layer, the first fabric being bonded to the first polymeric layer,

(ii) a second component comprising at least one second fabric of continuous filament glass yarns, the second fabric being a woven fabric having an areal weight of from 170 to 339 gsm and adjacent to and bonded to the first fabric of the first component, and

(iii) a third component comprising a second polymeric layer, the second polymeric layer being bonded to the second fabric,

 wherein

(a) the first fabric is a woven fabric has an areal weight of from 70 to 508 gsm and comprises yarns of aromatic polyamide, aromatic copolyamide, glass fiber or carbon fiber,

(b) the polymer of the first and second polymeric layers is polyurethane, polyethylene, polypropylene, polyethylenenaphthalate, polyacrylonitrile, fluoropolymer, polyimide, polyketone, polyimide, polysulfone, polyarlene sulfide, liquid crystal polymer, polycarbonate or an ionomer, and

(c) when the second fabric is free of a polymeric coating, the fabric has a flame barrier cover of at least 90% when measured over a minimum area of 645 sq. mm. of fabric surface, an areal weight of at least 136 gsm and the fabric comprises fiber having a nominal filament tensile strength of at least 3.4 GPa, or when the second fabric further comprises a polymeric coating on the surface of, or impregnated into the fabric, the coated fabric has a flame barrier cover of at least 90% when measured over a minimum area of 645 sq. mm. of fabric surface, an areal weight of at least 30 gsm and the fabric comprises fiber having a having a nominal filament tensile strength of at least 3.4 GPa and the polymeric coating is present in an amount of from 20 to 50 weight percent of the fabric weight with the proviso that, when the fabric prior to coating has a flame barrier cover of less than 90% and/or the fabric weight prior to coating is less than 135 gsm, then the coating weight is at least 50 gsm.

14. A non-rigid composite sheet comprising in order

(i) a first component having an areal weight of from 88 to 678 gsm comprising a first fabric of continuous filament yarns, the yarns having a tenacity of at least 11 g/dtex and a first polymeric layer, the first fabric being bonded to the first polymeric layer,

(ii) a second component comprising at least one second fabric of continuous filament glass yarns, the second fabric being a woven fabric having an areal weight of from 170 to 339 gsm and adjacent to and bonded to the first fabric of the first component, and

(iii) a third component comprising a third fabric of continuous filament yarns having a tenacity of at least 11 g/dtex, the third fabric being adjacent to and bonded to the second fabric, and a second polymeric layer, the second polymeric layer being bonded to the third fabric,

 wherein

(a) the first and third fabric is a woven fabric has an areal weight of from 70 to 508 gsm and comprises yarns of aromatic polyamide, aromatic copolyamide, glass fiber or carbon fiber,

(b) the polymer of the first and second polymeric layers is polyurethane, polyethylene, polypropylene, polyethylenenaphthalate, polyacrylonitrile, fluoropolymer, polyimide, polyketone, polyimide, polysulfone, polyarlene sulfide, liquid crystal polymer, polycarbonate or an ionomer, and

(c) when the second fabric is free of a polymeric coating, the fabric has a flame barrier cover of at least 90% when measured over a minimum area of 645 sq. mm. of fabric surface, an areal weight of at least 136 gsm and the fabric comprises fiber having a nominal filament tensile strength of at least 3.4 GPa, or when the second fabric further comprises a polymeric coating on the surface of, or impregnated into the fabric, the coated fabric has a flame barrier cover of at least 90% when measured over a minimum area of 645 sq. mm. of fabric surface, an areal weight of at least 30 gsm and the fabric comprises fiber having a having a nominal filament tensile strength of at least 3.4 GPa and the polymeric coating is present in an amount of from 20 to 50 weight percent of the fabric weight with the proviso that, when the fabric prior to coating has a flame barrier cover of less than 90% and/or the fabric weight prior to coating is less than 135 gsm, then the coating weight is at least 50 gsm.

15. The composite sheet of claim 13 or 14 wherein the fabrics and polymeric layers are bonded by an adhesive.