US4329478A
Expired / Lapsed
US
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Cyclic perfluoroaliphaticdisulfonic acid anhydrides
Assignee: 3M Co
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Filing: 1981-01-30
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Granted: 1982-05-11
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Expires: 2001-01-30
Abstract
Abstract Cyclic perfluoroaliphaticdisulfonic acid anhydrides, sulfonamide derivatives thereof, a process for making the same, curable compositions containing cyclic perfluoroaliphaticdisulfonic acid anhydrides or sulfonamide derivatives thereof and cationically-sensitive monomers, and a process for using cyclic perfluoroaliphaticdisulfonic acid anhydrides or sulfonamide derivatives thereof as catalysts for the cure of cationically-sensitive monomers.
Inventors
- 👤 Fred E. Behr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:03
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/26; C08G65/2642; C08G65/2669; C08G65/2675; C07; C07D; C07D327/00; C08G59/00; C08G59/18; C08G59/68; C08G59/687; C08G65/04; C08G65/06; C08G65/08; C08G65/10; C08G65/105; C08G65/2681; C08G65/2684; C08K; C08K5/00; C08K5/36; C08K5/45; C08K5/46
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
63 words
Cyclic anhydrides of perfluoroaliphaticdisulfonic acids, having the formula: ##STR11## wherein R f is perfluoroalkylene having 2 to 5 catenary carbon atoms or perfluorocycloalkylene having 4 to 7 ring atoms, R f optionally being substituted by one or more straight chain, branched, or cyclic perfluoroalkyl groups of 1 to 12 carbon atoms, with R f having a total of up to 14 carbon atoms.
Claim 2
Dependent Claim
63 words
Cyclic anhydrides of perfluoroaliphaticdisulfonic acids, having the formula: ##STR11## wherein R f is perfluoroalkylene having 2 to 5 catenary carbon atoms or perfluorocycloalkylene having 4 to 7 ring atoms, R f optionally being substituted by one or more straight chain, branched, or cyclic perfluoroalkyl groups of 1 to 12 carbon atoms, with R f having a total of up to 14 carbon atoms.
Claim 3
Dependent Claim
38 words
Compounds according to claim 1, wherein R f is perfluoroalkylene having 2 to 5 catenary carbon atoms, R f optionally being substituted by one or more straight chain or branched perfluoroalkyl groups of 1 to 4 carbon atoms.
Claim 4
Dependent Claim
19 words
Compounds according to claim 1, wherein R f is --CF 2 -- m and m is 2 to 4.
Claim 5
Dependent Claim
10 words
A compound according to claim 3, wherein m is 2.
Claim 6
Dependent Claim
10 words
A compound according to claim 3, wherein m is 3.
Claim 7
Dependent Claim
10 words
A compound according to claim 3, wherein m is 4.
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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) | 1985-05-10 | 1985-11-09 | 1986-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-10 | 1989-11-09 | 1990-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-10 | 1993-11-09 | 1994-05-11 | $7700.00 | Window Closed / Lapsed |