US3758618A
Expired / Lapsed
US
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Production of tetrafluoroethylene oligomers
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1973-02-27
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Granted: 1973-09-11
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Expires: 1993-02-27
Abstract
Abstract Tetrafluoroethylene is advantageously oligomerized by interacting fluoride ions with tetrafluoroethylene in the presence of quaternary ammonium ions from the chloride, bromide or iodide salts. The preferred source of fluoride ions is potassium fluoride.
Inventors
- 👤 W Deem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:53
CPC Classifications
C; C09; C09K; C09K23/00; C09K23/007; C10; C10M; C10M105/00; C10M105/50; C10M105/52; C10M107/00; C10M107/38; C10M2211/00; C10M2211/04; C10M2211/044; C10M2211/06; C10M2213/00; C10M2213/02; C10M2213/06; C10M2213/062; C10M2219/00; C10M2219/04; C10M2219/044; C10N; C10N2040/00; C10N2040/08; C10N2040/14; C10N2040/16; C10N2040/17
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
16 words
A process as claimed in claim 1 wherein the quaternary ammonium ion is a tetraalkylammonium ion.
Claim 2
Dependent Claim
19 words
A process as claimed in claim 2 wherein the quaternary ammonium ion is the tetramethylammonium or the tetraethylammonium ion.
Claim 3
Dependent Claim
14 words
A process as claimed in claim 2 wherein the quaternary ammonium ion is methyl(triethyl)ammonium.
Claim 4
Dependent Claim
18 words
A process as claimed in claim 1 wherein the quaternary ammonium ion is the benzyl(trimethyl)ammonium or benzyl(triethyl)ammonium ion.
Claim 5
Dependent Claim
16 words
A process as claimed in claim 1, wherein the quaternary ammonium ion is an alkenyl(trialkyl)ammonium ion.
Claim 6
Dependent Claim
20 words
A process as claimed in claim 6 wherein the quaternary ammonium ion is the allyl(trimethyl)ammonium or the allyl(triethyl) ammonium ion.
Claim 7
Dependent Claim
26 words
A process as claimed in claim 1 wherein the polar aprotic solvent is dimethylformamide, N-methyl pyrrolidone, dimethylacetamide, dimethylether of ethylene glycol or dimethylether of diethylene glycol.
Claim 8
Dependent Claim
19 words
A process as claimed in claim 1 wherein the tetrafluoroethylene is reacted under a pressure of 100-400 lb/sq. inch.
Claim 9
Dependent Claim
24 words
A process as claimed in claim 1 wherein the oligomer of tetrafluoroethylene produced has the formula (C2F4)n wherein n is 4, 5 or 6.
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |