US4244891A
Expired / Lapsed
US
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Preparation of hexafluoroisobutylene
Assignee: Honeywell International Inc
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Filing: 1979-12-21
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Granted: 1981-01-13
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Expires: 1999-12-21
Abstract
Abstract The process for preparing hexafluoroisobutylene which comprises reacting, at elevated temperatures, ketene or a ketene-generating compound with hexafluorothioacetone. Hexafluoroisobutylene is a known valuable monomer, which forms polymers of exceptional thermal, chemical and mechanical properties, particularly when copolymerized, such as with vinylidene fluoride.
Inventors
- 👤 Michael Van Der Puy
- 👤 Louis G. Anello
- 👤 Bernard Sukornick
- 👤 Richard F. Sweeney
- 👤 Robert A. Wiles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:38
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/26
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
18 words
The process for preparing hexafluoroisobutylene which comprises reacting, at elevated temperatures, ketene or a ketene-generating compound with hexafluorothioacetone.
Claim 2
Dependent Claim
18 words
The process for preparing hexafluoroisobutylene which comprises reacting, at elevated temperatures, ketene or a ketene-generating compound with hexafluorothioacetone.
Claim 3
Dependent Claim
13 words
The process according to claim 1 in which hexafluorothioacetone is reacted with ketene.
Claim 4
Dependent Claim
14 words
The process according to claim 1 in which the ketene-generating compound is acetic anhydride.
Claim 5
Dependent Claim
13 words
The process accroding to claim 1 in which the ketene-generating compound is diketene.
Claim 6
Dependent Claim
16 words
The process according to claim 1 in which the elevated temperatures are from about 300°-800° C.
Claim 7
Dependent Claim
16 words
The process according to claim 1 in which the elevated temperatures are from about 300°-650° C.
Claim 8
Dependent Claim
16 words
The process according to claim 1 in which the elevated temperatures are from about 400°-600° C.
Claim 9
Dependent Claim
16 words
The process according to claim 4 in which the elevated temperatures are from about 300°-800° C.
Claim 10
Dependent Claim
15 words
The process according to claim 8 which the elevated temperatures are from about 300°-650° C.
Claim 11
Dependent Claim
16 words
The process according to claim 9 in which the elevated temperatures are from about 400°-600° C.
References Cited (Backward Citations)
US3894097A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-13 | 1984-07-14 | 1985-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-13 | 1988-07-14 | 1989-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-13 | 1992-07-14 | 1993-01-13 | $7700.00 | Window Closed / Lapsed |