Properties for flash-spun products
AssigneeE. I. Du Pont de Nemours and Company
InventorsDavid Jackson McGinty, Hyunkook Shin, Young H. Kim
Life of this patent
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Abstract
This invention relates to flash spinning copolymers which provide softness and quietness to nonwoven sheet structures formed of plexifilamentary film-fibril material. In particular, flash spinning polyethylene with an ethylene copolymer provides a substantial improvement in softness and quietness.
Claims16
A soft polymeric flash-spun plexifilamentary material comprising an ethylene copolymer wherein the ethylene copolymer is made using single site catalysis and has a melt index from about 0.1 to about 50 g/10 min and a density of about 0.85 to about 0.95 g/cc and further wherein the flash-spun plexifilamentary material has a BET surface area of greater than 2 m.sup.2 /gm and molecular weight distribution of less than four.
A soft polymeric flash-spun plexifilamentary material comprising an ethylene copolymer blended with high density polyethylene polymer, wherein the ethylene copolymer has a melt index of between about 0.4 and about 10 g/10 min, a density between about 0.87 and about 0.93 g/cc, and a molecular weight distribution less than about 4, and wherein the plexifilamentary material has a BET surface area greater than about 8 m.sup.2 /gm.
A soft flash-spun nonwoven sheet material comprising an ethylene copolymer, wherein the ethylene copolymer is made using single site catalysis and has a density between about 0.85 to about 0.95 g/cc and a melt index between about 0.1 to about 50 g/10 min, and molecular weight distribution of less than four and wherein the flash spun nonwoven material has a BET surface area of greater than 2 m.sup.2 /gm and a breaking strength greater than 10 lb-yd.sup.2 /oz-in.
A soft polymeric flash-spun plexifilamentary material comprising an ethylene copolymer blended with high density polyethylene, wherein the ethylene copolymer has a melt index from about 0.1 to about 50 g/10 min and a density of about 0.85 to about 0.93 g/cc and further wherein the flash-spun plexifilamentary material has a BET surface area of greater than 2 m.sup.2 /gm.
A soft flash-spun nonwoven sheet material comprising an ethylene copolymer blended with high density polyethylene, wherein the ethylene copolymer has a density between about 0.85 to about 0.95 g/cc and a melt index between about 0.1 to about 50 g/10 min, and wherein the flash spun nonwoven material has a BET surface area of greater than 2 m.sup.2 /gm.
Dependencies are inferred from the claim text.