Flame resistant yarns and fabrics including partially aromatic polyamide fiber and other flame resistant fibers
View Patent ↗Disclosed are technical fibers and yarns made with partially aromatic polyamides and a fiber having vapor phase action such as an FR cellulosic fiber. Fabrics made from such fibers and yarns demonstrate superior flame retardancy over traditional flame retardant nylon 6,6 fabrics. Further, the disclosed fibers and yarns, when blended with other flame retardant fibers, do not demonstrate the dangerous “scaffolding effect” common with flame retardant nylon 6,6 blended fabrics.
1. An article exhibiting flame resistant or flame retardant property comprising a primary yarn; wherein said primary yarn comprises a flame resistant or flame retardant (FR) fiber having vapor phase action and a fiber different from said flame resistant or flame retardant fiber comprising a partially aromatic polyamide fiber; wherein said partially aromatic polyamide is spun into fiber without FR additives; and wherein said article is capable of self-extinguishing.
2. The article of claim 1 , wherein the partially aromatic polyamide comprises polymers or copolymers comprising monomers selected from the group consisting of aromatic diamine monomers, aliphatic diamine monomers, aromatic diacid monomers, aliphatic diacid monomers and combinations thereof.
3. The article of claim 2 , wherein the partially aromatic polyamide further comprises aromatic diamine monomers and aliphatic diacid monomers.
4. The article of claim 1 , wherein the partially aromatic polyamide is MXD6.
5. The article of claim 1 , wherein said partially aromatic polyamide fiber is in staple fiber form.
6. The article of claim 1 , wherein said partially aromatic polyamide fiber is in continuous filament form.
7. The article of claim 1 , wherein said partially aromatic polyamide fiber is a flat fiber.
8. The article of claim 1 , wherein said primary yarn is a twisted yarn or ply-twisted yarn.
9. The article of claim 1 , wherein said primary yarn is a textured yarn.
10. The article of claim 5 , wherein said primary yarn is a blended staple yarn.
11. The article of claim 1 , wherein said partially aromatic polyamide fiber is present in said primary yarn in an amount of about 5% to about 75% by weight of the primary yarn.
12. The article of claim 1 , wherein said partially aromatic polyamide fiber is present in said primary yarn in an amount of about 5% to about 60% by weight of the primary yarn.
13. The article of claim 11 , wherein said primary yarn includes only said partially aromatic fiber and said FR fiber.
14. The article of claim 1 , wherein said FR fiber having significant vapor phase action is selected from modacrylic fiber, FR cellulose fiber, and combinations thereof.
15. The article of claim 1 , wherein said primary yarn further includes an additional FR fiber selected from the group consisting of FR polyester, FR nylon, FR rayon, m-aramid, p-aramid, modacrylic, novoloid, melamine, poly(p-phenylene benzobisoxazole (PBO), polybenzimidazole (PBI), polysulphonamide (PSA), oxidized acrylic, partially oxidized acrylic, and combinations thereof.
16. The article of claim 1 , wherein said FR fiber comprises FR cellulose fiber wherein an FR treatment is selected from the group consisting of (a) application to said FR cellulose fiber, (b) incorporation into said FR cellulose fiber during fiber spinning and (c) topical application of an FR treatment to said article comprising untreated cellulosic fiber.
17. The article of claim 1 , further comprising an additional non-FR fiber.
18. The article of claim 1 , wherein said article is a yarn.
19. The article of claim 1 , wherein said article is a fabric.
20. The article of claim 1 , wherein said article is a garment.
21. The article of claim 1 , further comprising at least one additional yarn which is compositionally different from said primary yarn.
22. The article of claim 1 , further comprising at least two additional yarns which are compositionally different from each other and compositionally different from said primary yarn.
23. The article of claim 21 , wherein said additional yarn is an FR yarn.
24. The article of claim 21 , wherein said additional yarn is a non-FR yarn.
25. The article of claim 1 , wherein said article is a fabric capable of self-extinguishing and having an After Flame time of less than about 10 seconds in a vertical flammability test.
26. The article of claim 18 , wherein said article is dyed.
27. The article of claim 19 , wherein said article is dyed.
28. The article of claim 19 , wherein said article is printed.