Patent US5268218A successfully refreshed from Google Patents.
US5268218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resin-impregnated plexifilamentary sheet
Assignee: EIDP Inc
•
Filing: 1993-02-26
•
Granted: 1993-12-07
•
Expires: 2013-02-26
Abstract
Abstract Sheets of flash-spun polyolefin plexifilamentary film-fibril strands are subjected to impact-energy by columnar jets of water and are then impregnated with organic resin to provide sheet of high abrasion resistance and a wide range of desirable porosity.
Inventors
- 👤 Dimitri P. Zafiroglu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:05
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/44; D04H1/46; D04H1/48; D04H1/49; Y; Y10; Y10T; Y10T442/00; Y10T442/20; Y10T442/273; Y10T442/2861; Y10T442/291
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
83 words
A resin-impregnated nonwoven sheet comprising a nonwoven layer of flash-spun polyolefin plexifilamentary film-fibril strands which has been water jet impacted and impregnated with an organic resin, the nonwoven layer being in the range of 10 to 70% of the total weight of the resin-impregnated sheet and the resin being in the range of 90 to 30% of the total weight of the resin-impregnated sheet, the total weight of the resin-impregnated sheet being in the range of 50 to 500 grams per square meter.
Claim 2
Dependent Claim
83 words
A resin-impregnated nonwoven sheet comprising a nonwoven layer of flash-spun polyolefin plexifilamentary film-fibril strands which has been water jet impacted and impregnated with an organic resin, the nonwoven layer being in the range of 10 to 70% of the total weight of the resin-impregnated sheet and the resin being in the range of 90 to 30% of the total weight of the resin-impregnated sheet, the total weight of the resin-impregnated sheet being in the range of 50 to 500 grams per square meter.
Claim 3
Dependent Claim
65 words
A resin-impregnated nonwoven sheet in accordance with claim 1 wherein resin-impregnated sheet has a total weight in the range of 60 to 200 g/m 2 , a thickness in the range of 0.15 to 0.50 mm, a water-vapor permeability in the range of 10 to 1500 grams per day per square meter, and a Wyzenbeek abrasion wear is of no more than 0.2 mm/1000 cycles.
Claim 4
Dependent Claim
33 words
A resin-impregnated nonwoven sheet in accordance with claim 2 wherein the permeability is in the range of 500 to 1200 g/d/m 2 and the abrasion wear is no more than 0.1 mm/1000 cycles.
Claim 5
Dependent Claim
134 words
A process for preparing a resin-impregnated nonwoven sheet of flash-spun polyolefin plexifilamentary film-fibril strands comprising preparing a lightly consolidated nonwoven sheet of flash-spun polyolefin plexifilamentary film-fibril strands, the sheet weighing in the range of 25 to 150 g/m 2 , supporting the nonwoven sheet on a foraminous member, advancing the supported sheet underneath columnar jets of water, said jets being supplied to orifices at a pressure in the range of 1,380 to 20,700 KPa and providing a total impact energy of at least 0.02 megaJoule-Newtons per kilogram to open the sheet structure, impregnating the sheet with a solution of resin in a solvent which is a non-solvent for the polyolefin, the resin amounting to 30 to 90 percent of the total weight of the dry resin-impregnated sheet evaporating the solvent from the impregnated sheet.
Claim 6
Dependent Claim
134 words
A process for preparing a resin-impregnated nonwoven sheet of flash-spun polyolefin plexifilamentary film-fibril strands comprising preparing a lightly consolidated nonwoven sheet of flash-spun polyolefin plexifilamentary film-fibril strands, the sheet weighing in the range of 25 to 150 g/m 2 , supporting the nonwoven sheet on a foraminous member, advancing the supported sheet underneath columnar jets of water, said jets being supplied to orifices at a pressure in the range of 1,380 to 20,700 KPa and providing a total impact energy of at least 0.02 megaJoule-Newtons per kilogram to open the sheet structure, impregnating the sheet with a solution of resin in a solvent which is a non-solvent for the polyolefin, the resin amounting to 30 to 90 percent of the total weight of the dry resin-impregnated sheet evaporating the solvent from the impregnated sheet.
Claim 7
Dependent Claim
21 words
A process in accordance with claim 4 wherein the impact energy product is in the range of 0.04 to 0.16 MJN/Kg.
References Cited (Backward Citations)
US3169899A
Cited
US3532589A
Cited
US3403862A
Cited
US3485706A
Cited
US4152389A
Cited
US5023130A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-12-06 | 1997-06-07 | 1997-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-06 | 2001-06-07 | 2001-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-06 | 2005-06-07 | 2005-12-07 | $7700.00 | Window Closed / Lapsed |