US5356668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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 21:05
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.
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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 |