US4000356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of thermoplastically workable fluoro-olefin polymers
Assignee: Dynamit Nobel AG
•
Filing: 1975-06-18
•
Granted: 1976-12-28
•
Expires: 1995-06-18
Abstract
Abstract An improvement in a process for the preparation of thermoplastically workable fluoro-polyolefins and their copolymers wherein a fluorine containing olefin is polymerized or copolymerized in the aqueous phase in the presence of a water-soluble, radical-forming catalyst and a polymerization regulator, the improvement residing in employing as the polymerization regulator a halogenated hydrocarbon having from one to three carbon atoms and at least three halogen atoms of which at least one is a fluorine atom and at least one is a bromine or iodine atom.
Inventors
- 👤 Gregor Weisgerber
- 👤 Werner Trautvetter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:04
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/18; C08F2438/00; C08F2438/01
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
86 words
In a process for the preparation of thermoplastically workable fluoro-polyolefins and their copolymers by polymerization or copolymerization of fluorine-containing olefins in the aqueous phase in the presence of a water-soluble radical-forming catalyst and a polymerization regulator, the improvement which comprises employing as such regulator a halogenated hydrocarbon having one carbon atom and having at least three halogen atoms of which at least one is fluorine and at least another is bromine or iodine, said regulator being employed in an amount between 0.05 and 10% by weight.
Claim 2
Dependent Claim
86 words
In a process for the preparation of thermoplastically workable fluoro-polyolefins and their copolymers by polymerization or copolymerization of fluorine-containing olefins in the aqueous phase in the presence of a water-soluble radical-forming catalyst and a polymerization regulator, the improvement which comprises employing as such regulator a halogenated hydrocarbon having one carbon atom and having at least three halogen atoms of which at least one is fluorine and at least another is bromine or iodine, said regulator being employed in an amount between 0.05 and 10% by weight.
Claim 3
Dependent Claim
41 words
A process according to claim 1 wherein the regulator is selected from the group consisting of CHFBr 2 , CF 2 Br 2 , CHF 2 Br, CBr 3 F, CHFI 2 , CHFBrCl, CFBrCl 2 , and CFBr 2 Cl.
Claim 4
Dependent Claim
14 words
A process according to claim 1 wherein said polymerization regulator is CF 2 BrCl.
Claim 5
Dependent Claim
12 words
A process according to claim 1 wherein said polymerization regulator is dibromodifluoromethane.
References Cited (Backward Citations)
GB883850A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-28 | 1980-06-28 | 1980-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-28 | 1984-06-28 | 1984-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-28 | 1988-06-28 | 1988-12-28 | $7700.00 | Window Closed / Lapsed |