Plexifilamentary sheets
US-10920028-B2 · Feb 16, 2021 · US
Plexifilamentary sheets
US11866558B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11866558-B2 |
| Application number | US-202117145626-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 11, 2021 |
| Priority date | Jun 18, 2014 |
| Publication date | Jan 9, 2024 |
| Grant date | Jan 9, 2024 |
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Abstract
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A sheet comprising a plexifilamentary film-fibril network consisting essentially of high density polyethylene in an overlapping multi-directional configuration, the sheet, as-produced from a spin cell, having a normalized Frazier air permeability of between 0.002 and 0.2 m 3 /m 2 ·minute at 50 gsm, a BET surface area of between 9 and 20 m 2 /gm, and a normalized hydrohead of between 150 and 250 cm at 50 gsm, wherein the plexifilamentary film-fibril network in an overlapping multi-directional configuration is flash-spun from a spin fluid comprising polymer and spin agent, the spin fluid temperature being 190° C. or greater, the spin agent comprising dichloromethane, the spin fluid having a polymer concentration of 12 to 14 weight percent.
First claim
Opening claim text (preview).
We claim: 1. A sheet comprising a plexifilamentary film-fibril network consisting essentially of high density polyethylene in an overlapping multi-directional configuration, the sheet, as-produced from a spin cell, having a normalized Frazier air permeability of between 0.002 and 0.2 m 3 /m 2 ·minute at 50 gsm, a BET surface area of between 9 and 20 m 2 /gm, and a normalized hydrohead of between 150 and 250 cm at 50 gsm, wherein the plexifilamentary film-fibril network in an overlapping multi-directional configuration is flash-spun from a spin fluid comprising polymer and spin agent, the spin fluid temperature being 190 to 195° C., the spin agent comprising a mixture of processing media comprising dichloromethane, the spin fluid having a polymer concentration of 12 to 14 weight percent. 2. The sheet of claim 1 wherein the sheet as-produced from the spin cell has a normalized Frazier air permeability of less than or equal to 0.09 m 3 /m 2 ·minute at 50 gsm. 3. The sheet of claim 1 wherein the sheet as-produced from the spin cell has a Frazier air permeability of greater than or equal to 0.0075 m 3 /m 2 ·minute at 50 gsm. 4. The sheet of claim 1 wherein the sheet as-produced from the spin cell has a normalized hydrohead of between 165 and 208 centimeters at 50 gsm. 5. The sheet of claim 1 wherein the sheet as-produced from the spin cell has a basis weight of greater than or equal to 30 grams per square meter. 6. A multilayer structure comprising a multiplicity of two or more sheets wherein at least one sheet is a sheet according to claim 1 . 7. A thermally consolidated sheet made from sheet according to claim 1 . 8. A multilayer structure comprising a multiplicity of two or more sheets wherein at least one sheet is a sheet according to claim 7 .
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- What does patent US11866558B2 cover?
- A sheet comprising a plexifilamentary film-fibril network consisting essentially of high density polyethylene in an overlapping multi-directional configuration, the sheet, as-produced from a spin cell, having a normalized Frazier air permeability of between 0.002 and 0.2 m 3 /m 2 ·minute at 50 gsm, a BET surface area of between 9 and 20 m 2 /gm, and a normalized hydrohead of between 150 and 250…
- Who is the assignee on this patent?
- Dupont Safety & Construction Inc
- What technology area does this patent fall under?
- Primary CPC classification C08J5/18. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jan 09 2024 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).