Patent US4025709A successfully refreshed from Google Patents.
US4025709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the polymerization of vinylidene fluoride
Assignee: Produits Chimiques Ugine Kuhlmann
•
Filing: 1975-09-22
•
Granted: 1977-05-24
•
Expires: 1995-09-22
Abstract
Abstract A process for the polymerization of vinylidene fluoride H 2 C=CF 2 using a novel class of fluorinated emulsifiers having the general formula: R.sub.f --C.sub.2 H.sub.4 --SO.sub.3 M wherein R f is a perfluorinated radical having 4 to 10 carbon atoms and M is an alkali metal such as lithium, sodium or potassium or an ammonium radical NH 4 .
Inventors
- 👤 Jean Blaise
- 👤 Edouard Grimaud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:21
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/18; C08F14/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
102 words
Process for the homopolymerization of vinylidene fluoride or the copolymerization of vinylidene fluoride with less than about 10% by weight based on the vinylidene fluoride of an ethylenically unsaturated comonomer known to be copolymerizable therewith, which comprises polymerizing the vinylidene fluoride alone or together with said comonomer in an aqueous medium in the presence of a peroxide initiator and between about 0.2% and 0.5% based on the weight of the water of a water-soluble salt of a compound corresponding to the formula R.sub.f --C.sub.2 H.sub.4 SO.sub.3 H in which R f is a perfluoroalkyl radical containing from 4 to 10 carbon atoms.
Claim 2
Dependent Claim
102 words
Process for the homopolymerization of vinylidene fluoride or the copolymerization of vinylidene fluoride with less than about 10% by weight based on the vinylidene fluoride of an ethylenically unsaturated comonomer known to be copolymerizable therewith, which comprises polymerizing the vinylidene fluoride alone or together with said comonomer in an aqueous medium in the presence of a peroxide initiator and between about 0.2% and 0.5% based on the weight of the water of a water-soluble salt of a compound corresponding to the formula R.sub.f --C.sub.2 H.sub.4 SO.sub.3 H in which R f is a perfluoroalkyl radical containing from 4 to 10 carbon atoms.
Claim 3
Dependent Claim
31 words
Process according to claim 1 in which the water-soluble salt is a metal salt selected from the group I metals of the Mendeleev Periodic Table Of Elements or an ammonium salt.
Claim 4
Dependent Claim
14 words
Process according to claim 2 in which the water-soluble salt is a sodium salt.
Claim 5
Dependent Claim
27 words
Process according to claim 1 in which the amount of peroxide initiator is between about 0.005% and 0.5% by weight based on the weight of the monomer.
Claim 6
Dependent Claim
37 words
Process according to claim 1 in which the comonomer is ethylene, hexafluoropropene, tetrafluoroethylene, trifluorochloroethylene or ethylenically unsaturated compounds having 2 and 3 carbon atoms in which the hydrogen is at least partially substituted by chlorine or fluorine.
Claim 7
Dependent Claim
43 words
Process according to claim 1 in which the emulsifying agent is a water-soluble salt of CF 3 (CF 2 ) 5 -C 2 H 4 -SO 3 H or of CF 3 (CF 2 ) 7 C 2 H 4 SO 3 H.
References Cited (Backward Citations)
US3475396A
Cited
US3600369A
Cited
US3616371A
Cited
US3640985A
Cited
US3798265A
Cited
US3780007A
Cited
US3803108A
Cited
US3781265A
Cited
US3857827A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |