US3880798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorocarbon compounds
Assignee: Imperial Chemical Industries Ltd
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Filing: 1973-04-20
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Granted: 1975-04-29
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Expires: 1993-04-20
Abstract
Abstract Surface active derivatives of the TFE oligomers containing a fluorocarbon group of formula C2nF4n 1 and a phosphate group OPO3M2 (wherein M is hydrogen, alkali metal, ammonium or alkyl ammonium) are used in the preparation of composites with granular PTFE with fillers such as glass and metal.
Inventors
- 👤 William Roy Deem
- 👤 Keith Ogden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:17
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
61 words
A METHOD OF PREPARING A FILLED FLUOROCARBON POLYMER FROM A FILLER AND A GRANULAR FLUOROCARBON POLYMER, BOTH IN POWDER FORM, COMPRISING TREATING THE FILLER WITH A SURFACEACTIVE COMPOUND TO MAKE IT HYDROPHOBIC, AGGLOMERATING THE FILLER TOGETHER WITH THE POLYMER FROM AN AQUEOUS MEDIUM, REMOVING THE AGGLOMERATES FROM THE AQUEOUS MEDIUM AND DRYING THE AGGLOMERATES, WHEREIN THE SURFACE-ACTIVE COMPOUND HAS THE FORMULA:
Claim 2
Independent Claim
61 words
A METHOD OF PREPARING A FILLED FLUOROCARBON POLYMER FROM A FILLER AND A GRANULAR FLUOROCARBON POLYMER, BOTH IN POWDER FORM, COMPRISING TREATING THE FILLER WITH A SURFACEACTIVE COMPOUND TO MAKE IT HYDROPHOBIC, AGGLOMERATING THE FILLER TOGETHER WITH THE POLYMER FROM AN AQUEOUS MEDIUM, REMOVING THE AGGLOMERATES FROM THE AQUEOUS MEDIUM AND DRYING THE AGGLOMERATES, WHEREIN THE SURFACE-ACTIVE COMPOUND HAS THE FORMULA:
Claim 3
Dependent Claim
23 words
A method according to claim 1 wherein the surface active compound is in accordance with the formula C10F19 O C6H4SO2N(CH3)CH2CH2 O PO (OH)2.
Claim 4
Dependent Claim
36 words
A method according to claim 1 wherein the filler is treated with a solution of the surface active compound to render it hydrophobic prior to mixing and agitating it with granular polytetrafluoroethylene in an aqueous medium.
Claim 5
Dependent Claim
15 words
Filled granular polytetrafluoroethylene wherein the filler is coated with a fluorocarbon derivative having the formula:
Claim 6
Dependent Claim
15 words
Filled granular polytetrafluoroethylene wherein the filler is coated with a fluorocarbon derivative having the formula:
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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |