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US4882113A
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Heterogeneous elastomeric compositions containing a fluoroelastomer and PTFE and methods for manufacturing said compositions
Assignee: Edwards Lifesciences Corp
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Filing: 1989-01-26
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Granted: 1989-11-21
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Expires: 2009-01-26
Abstract
Abstract A composition comprising a homogenous mixture of unsintered porous fluoropolymer particles and fluoroelastomers, processes for manufacturing the composition, and devices made from the composition.
Inventors
- 👤 Roger Tu
- 👤 Wilfred F. Mathewson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:25
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/12; C08L27/18; Y; Y10; Y10S; Y10S521/00; Y10S521/919
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
57 words
A process for manufacturing an article from a heterogeneous composition of unsintered porous polytetrafluoroethylene (PTFE) particles and a fluoroelastomer, comprising: (a) mixing particulate unsintered porous PTFE particles and fluoroelastomer to form a heterogenous mixture wherein the unsintered porous PTFE particles have become substantially saturated with the tetrafluoroethylene/propylene copolymer fluoroelastomer; (b) forming the article from the heterogenous mixture.
Claim 2
Dependent Claim
57 words
A process for manufacturing an article from a heterogeneous composition of unsintered porous polytetrafluoroethylene (PTFE) particles and a fluoroelastomer, comprising: (a) mixing particulate unsintered porous PTFE particles and fluoroelastomer to form a heterogenous mixture wherein the unsintered porous PTFE particles have become substantially saturated with the tetrafluoroethylene/propylene copolymer fluoroelastomer; (b) forming the article from the heterogenous mixture.
Claim 3
Dependent Claim
71 words
The process of claim 1 further including the steps of: (a) mixing said mixture with a liquid lubricant to form a paste; (b) compression molding the paste into a billet; (c) extruding the billet into an extrudate; (d) stretching the extrudate at an elevated temperature at a rate of at least about 10% per second to form an expanded article; and (e) sintering the expanded article at an elevated sintering temperature.
Claim 4
Dependent Claim
20 words
The process of claim 1, wherein the PTFE particles have an average diameter of about 50 to about 1000 microns.
Claim 5
Dependent Claim
28 words
The process of claim 1, wherein the ratio of unsintered porous PTFE particles to fluoroelastomer ranges from about 7:3 to about 1:99 on a weight to weight basis.
Claim 6
Dependent Claim
28 words
The process of claim 1, wherein the ratio of unsintered porous PTFE particles to fluoroelastomer ranges from about 1:3 to about 1:20 on a weight to weight basis.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-20 | 1993-05-22 | 1993-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-20 | 1997-05-22 | 1997-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-20 | 2001-05-22 | 2001-11-21 | $7700.00 | Window Closed / Lapsed |