Ethylene copolymer-modified polyamide product
View Patent ↗Disclosed are films, tapes, and melt-spun fibers comprising or prepared from a composition comprising (a) at least one polyamide polymer; and (b) from about 0.1 to 20 weight % of at least one ethylene copolymer such as ethylene/vinyl acetate dipolymers, ethylene/vinyl acetate terpolymers, ethylene/alkyl (meth)acrylate dipolymers, ethylene/alkyl (meth)acrylate terpolymers, functionalized ethylene copolymers, ethylene/acid copolymers, and salts thereof. The films, tapes and fibers exhibit improved tensile properties such as tensile strength and elongation at break compared to nonmodified polyamide compositions. Also disclosed are nonwoven textiles comprising or prepared from the oriented melt-spun fibers.
1. An article comprising, or prepared from, a composition which comprises (a) at least one polyamide polymer; and (b) at least one E/X/Y copolymer wherein
the article is an oriented film or an oriented fiber that has been drawn at a temperature below the melting point of the polyamide polymer to a draw ratio greater than 10:1;
the amount of the E/X/Y copolymer is from 0.1 to 20 weight %, based on the total weight of the composition;
E represents copolymerized residues of ethylene;
X represents conolymerized residues of at least one comonomer selected from the group consisting of vinyl acetate and alkyl (meth)acrylic esters;
Y represents copolymerized residues of one or more comonomers selected from the group consisting of carbon monoxide, sulfur dioxide, acrylonitrile, maleic anhydride, maleic acid diesters, (meth)acrylic acid, maleic acid, maleic acid monoesters, itaconic acid, fumaric acid, fumaric acid monoesters, and salts thereof, glycidyl acrylate, glycidyl methacrylate, and glycidyl vinyl ether; and
the amount of X is from 0 to 50 weight % and the amount of Y is from 0 to 35 weight %, based on the total weight of the E/X/Y copolymer, the weight % of X and Y cannot both be 0, and the remainder of the E/X/Y copolymer comprises copolymerized ethylene E.
2. The article of claim 1 wherein the amount of the at least one E/X/Y copolymer is from 0.5 to 10 weight %, based on the total weight of the composition, and further wherein the at least one E/X/Y copolymer comprises an ethylene/alkyl acrylate copolymer.
3. The article of claim 2 wherein the ethylene/alkyl acrylate copolymer comprises from about 5 to about 35 weight % of copolymerized alkyl acrylate residues, based on the total weight of the ethylene/alkyl acrylate copolymer.
4. The article of claim 2 wherein the ethylene/alkyl acrylate copolymer cormprises from about 10 to about 30 weight % of copolymerized alkyl acrylate residues, based on the total weight of the ethylene/alkyl acrylate copolymer.
5. The article of claim 2 wherein the alkyl acrylate comprises one or more comonomers selected from the group consisting of methyl acrylate, ethyl acrylate, and butyl acrylate.
6. The article of claim 5 wherein the alkyl acrylate comprises methyl acrylate.
7. A tape comprising or produced by slitting an oriented film of claim 6 .
8. An oriented fiber prepared by hot-drawing and, optionally, annealing a tape of claim 7 .
9. A nonwoven, woven, or knitted textile comprising, or prepared from, an oriented fiber of claim 6 .
10. The article of claim 2 wherein the ethylene/alkyl acrylate copolymer is produced in a tubular reactor.
11. A tape comprising or produced by slitting an oriented film of claim 10 .
12. An oriented fiber prepared by hot-drawing and, optionally, annealing a tape of claim 11 .
13. A tape comprising or produced by slitting an oriented film of claim 2 .
14. An oriented fiber prepared by hot-drawing and, optionally, annealing a tape of claim 13 .
15. A nonwoven, woven, or knitted textile comprising, or prepared from, an oriented fiber of claim 2 .
16. The article of claim 1 further comprising (c) from 0.01 to 20 weight %, based on the total weight of the composition, of at least one additional component selected from the group consisting of fillers, delustrants, thermal and ultraviolet stabilizers, ultraviolet absorbers, antistatic agents, terminating agents, fluorescent whitening agents, pigments, and other additives.
17. The article of claim 16 wherein component (b) is present in an amount of from 0.1 to 15 weight %, based on the total weight of the composition.
18. A tape comprising or produced by slitting an oriented film of claim 17 .
19. An oriented fiber prepared by hot-drawing and, optionally, annealing a tape of claim 18 .
20. A nonwoven, woven, or knitted textile comprising, or prepared from, an oriented fiber of claim 17 .
21. The article of claim 16 wherein component (b) is present in an amount of from 1 to 7 weight %, based on the total weight of the composition.
22. The article of claim 1 wherein the polyamide polymer comprises polyepsiloncaprolactam, polyhexamethylene adipamide, or both polyepsiloncaprolactam and polyhexamethylene adipamide.
23. The article of claim 22 being a biaxially oriented film, wherein the polyamide polymer comprises polyepsiloncaprolactam and the at least one E/X/Y copolymer comprises at least one ethylenelalkyl acrylate copolymer.
24. A tape comprising or produced by slitting an oriented film of claim 23 .
25. An oriented fiber prepared by hot-drawing and, optionally, annealing a tape of claim 24 .
26. A tape comprising or produced by slitting an oriented film of claim 1 .
27. An oriented fiber prepared by hot-drawing and, optionally, annealing a tape of claim 26 .
28. An oriented fiber of claim 1 that is a melt spun fiber.
29. The oriented fiber of claim 28 wherein Y represents copolymerized residues of one or more comonomers selected from the group consisting of maleic anhydride, maleic acid, a diester or monoester of maleic acid, a salt of maleic acid and a salt of a monoester or diester of maleic acid.
30. The oriented fiber of claim 28 , wherein the polyamide polymer comprises nylon 6, nylon 66, nylon 612, nylon 11, nylon 12, or a blend of two or more thereof.
31. The article of claim 1 wherein the amount of the E/X/Y copolymer is from 0.1 to 15, weight %, based on the total weight of the composition.