Patent US5356668A successfully refreshed from Google Patents.
US5356668A
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Fluorinating polymer surfaces
Assignee: Vascutek Ltd
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Filing: 1991-12-09
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Granted: 1994-10-18
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Expires: 2011-12-09
Abstract
Abstract Surfaces of polymers, particularly polyesters, can be fluorinated by deposition of a fluorocarbon from solution. The fluorocarbon may be an amorphous fluoropolymer, such as the copolymer of tetrafluoroethylene and bis-2,2-trifluoromethyl-4,5-difluoro-1,2-dioxole sold under the trademark TEFLON AF®, which is soluble in fluorinated alkanes and other fluorinated liquids such as those sold under the trademark FLUORINERT®. Surface-fluorinated polyesters, particularly in knitted fabric form, are useful as vascular grafts: the fluorinated surface reduces thrombogenicity and complement activation. The disadvantages of known surface fluorination methods, such as the cold plasma or glow discharge process, are avoided.
Inventors
- 👤 Duncan M. Paton
- 👤 Timothy R. Ashton
- 👤 Roshan Maini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:00
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/091; A; A61; A61L; A61L33/00; A61L33/0076; A61L33/0082; A61L33/06; A61L33/064; B; B05; B05D; B05D7/00; B05D7/02; C08J7/00; C08J7/04; C08J7/0427; D; D06; D06M; D06M15/00; D06M15/19; D06M15/21; D06M15/244; D06M15/256; D06M23/00; D06M23/10; B05D2201/00; B05D2201/02; B05D2401/00; B05D2401/10; B05D2506/00; B05D2506/10; C08J2327/00; C08J2327/02; C08J2327/12; C08J2427/00; D06M2101/00; D06M2101/16; D06M2101/30; D06M2101/32
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
67 words
A process for forming a fluorinated surface on a polymer, the process comprising the steps of: a) forming a solution of perfluorocarbon in a solvent for the perfluorocarbon wherein the solvent is selected from the group consisting of perfluoroalkanes, perfluorocycloalkanes and mixtures thereof; b) bringing the solution into contact with the polymer surface; and c) removing the solvent from the solution in contact with the polymer surface.
Claim 2
Dependent Claim
67 words
A process for forming a fluorinated surface on a polymer, the process comprising the steps of: a) forming a solution of perfluorocarbon in a solvent for the perfluorocarbon wherein the solvent is selected from the group consisting of perfluoroalkanes, perfluorocycloalkanes and mixtures thereof; b) bringing the solution into contact with the polymer surface; and c) removing the solvent from the solution in contact with the polymer surface.
Claim 3
Dependent Claim
16 words
The process as claimed in claim 1, wherein the solvent additionally contains a tertiary amine function.
Claim 4
Dependent Claim
16 words
The process as claimed in claim 1, wherein the solvent additionally contains a tertiary ether function.
Claim 5
Dependent Claim
60 words
A process for forming a fluorinated surface on a polymer, the process comprising the steps of: a) forming a solution of an amorphous fluorinated copolymer of tetrafluoroethylene and bis-2,2-trifluoromethyl-4,5-difluoro-1,2-dioxole, in a solvent for the amorphous fluorocarbon; b) bringing the solution into contact with the polymer surface; and c) removing the solvent from the solution in contact with the polymer surface.
Claim 6
Dependent Claim
60 words
A process for forming a fluorinated surface on a polymer, the process comprising the steps of: a) forming a solution of an amorphous fluorinated copolymer of tetrafluoroethylene and bis-2,2-trifluoromethyl-4,5-difluoro-1,2-dioxole, in a solvent for the amorphous fluorocarbon; b) bringing the solution into contact with the polymer surface; and c) removing the solvent from the solution in contact with the polymer surface.
Claim 7
Dependent Claim
18 words
A process as claimed in claim 1, wherein the polymer is in the form of a surgical graft.
Claim 8
Dependent Claim
18 words
A process as defined in claim 1, wherein the polymer is in the form of a vascular graft.
Claim 9
Dependent Claim
29 words
A process as claimed in claim 1, wherein the polymer is in the form of a surgical graft and wherein said graft is sealed after forming the fluorinated surface.
Claim 10
Dependent Claim
32 words
A process as claimed in claim 1, wherein the polymer is in the form of a surgical graft and wherein said graft is sealed with a gelatin after forming the fluorinated surface.
References Cited (Backward Citations)
US3839743A
Cited
US4167045A
Cited
US4153745A
Cited
US4414280A
Cited
US4470859A
Cited
US4391844A
Cited
US4413074A
Cited
US4902290A
Cited
US4981727A
Cited
US4985280A
Cited
US5171611A
Cited
US5061738A
Cited
US5242995A
Cited
US5246451A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-10-17 | 1998-04-18 | 1998-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-17 | 2002-04-18 | 2002-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-17 | 2006-04-18 | 2006-10-18 | $7700.00 | Window Closed / Lapsed |