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US4356291A
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Purification and polymerization of hexafluoropropylene oxide
Assignee: EIDP Inc
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Filing: 1981-04-03
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Granted: 1982-10-26
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Expires: 2001-04-03
Abstract
Abstract Purified hexafluoropropylene oxide is produced by scrubbing to remove impurities that inhibit polymerization of hexafluoropropylene oxide, thus permitting the preparation of polymers having a degree of polymerization of more than 200, including end-capped and chain-extended derivatives thereof.
Inventors
- 👤 Thomas R. Darling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:08
CPC Classifications
C; C07; C07D; C07D303/00; C07D303/02; C07D303/48; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/22; C08G65/223; C08G65/226
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
101 words
A polymer of hexafluoropropylene oxide of the formula ##STR3## wherein X is COF, COOR, CONR 2 , H, F, CN, Br, I, CH 2 OH, CH 2 NR 2 , C(CH 3 ) 2 OH, COO - M + , or CF 2 --O--CF 2 CF 2 I, R is hydrogen, alkyl, aryl, or cycloalkyl, M + is a mono-, di-, tri- or tetra-valent metal ion, R f is the initiator residue and can be monofunctional or difunctional, m is an integer greater than 200, and n is 1 if R f is monofunctional and 2 if R f is difunctional.
Claim 2
Dependent Claim
101 words
A polymer of hexafluoropropylene oxide of the formula ##STR3## wherein X is COF, COOR, CONR 2 , H, F, CN, Br, I, CH 2 OH, CH 2 NR 2 , C(CH 3 ) 2 OH, COO - M + , or CF 2 --O--CF 2 CF 2 I, R is hydrogen, alkyl, aryl, or cycloalkyl, M + is a mono-, di-, tri- or tetra-valent metal ion, R f is the initiator residue and can be monofunctional or difunctional, m is an integer greater than 200, and n is 1 if R f is monofunctional and 2 if R f is difunctional.
Claim 3
Dependent Claim
9 words
A polymer of claim 1 wherein X is COF.
Claim 4
Dependent Claim
44 words
A process of preparing a polymer of claim 2 which comprises reacting purified hexafluoropropylene oxide containing less than 0.1 ppm hydrogen fluoride, less than 0.2% acid fluorides, less than 0.01% hexafluoroacetone and less than 1 ppm water with an alkali metal perfluoroalkoxide polymerization initiator.
Claim 5
Dependent Claim
10 words
The process of claim 3 wherein the initiator is difunctional.
Claim 6
Dependent Claim
15 words
The process of claim 4 wherein the initiator is a compound of the formula: ##STR4##
Claim 7
Dependent Claim
15 words
The process of claim 3 wherein the reaction mixture is maintained as a single phase.
Claim 8
Dependent Claim
15 words
The process of claim 5 wherein the reaction mixture is maintained as a single phase.
Claim 9
Dependent Claim
43 words
A polymer of claim 1 wherein X is COOR, CONR 2 , H, F, Br, I, CN, CH 2 OH, CH 2 NR 2 , C(CH 3 ) 2 OH, COO - M + , or CF 2 --O--CF 2 CF 2 I.
Claim 10
Dependent Claim
27 words
A polymer of claim 5 wherein X is COOH, H, F, Br, I, CN, COO - M + , or CF 2 --O--CF 2 CF 2 I.
Claim 11
Dependent Claim
31 words
A process of preparing a polymer of claim 1 where X is F comprising hydrolyzing the corresponding polymer where X is COF, and then simultaneously halogenating and decarboxylating the hydrolyzed product.
Claim 12
Dependent Claim
28 words
A process for preparing a polymer of claim 1 where X is H comprising pyrolysis of a hydrogen containing derivative of the corresponding polymer where X is COF.
Claim 13
Dependent Claim
35 words
A process of preparing a polymer of claim 1 where X is H comprising reacting a monovalent metal acid salt of the corresponding polymer where X is COF with a solvent containing an active hydrogen.
Claim 14
Dependent Claim
26 words
A process of preparing a polymer of claim 1 where X is COOR and R is hydrogen comprising hydrolyzing the corresponding polymer where X is COF.
Claim 15
Dependent Claim
24 words
A process of preparing a polymer of claim 1 where X is CN comprising dehydrating the corresponding polymer where X is CONH 2 .
Claim 16
Dependent Claim
36 words
A process of preparing a polymer of claim 1 where X is COO - M + comprising mixing the corresponding polymer where X is COOH with an aqueous dispersion of a metal hydroxide or metal oxide.
Claim 17
Dependent Claim
25 words
A process of preparing a polymer of claim 1 where X is Br comprising reacting the silver acid salt of the corresponding polymer with bromine.
Claim 18
Dependent Claim
25 words
A process of preparing a polymer of claim 1 where X is I comprising reacting the silver acid salt of the corresponding polymer with iodine.
Claim 19
Dependent Claim
47 words
A process of preparing a polymer of claim 1 where X is CF 2 --O--CF 2 --CF 2 I comprising reacting the corresponding acid fluoride end-capped polymer with a mixture of tetrafluoroethylene, potassium fluoride and a compound selected from the group consisting of iodine and iodine chloride.
Claim 20
Dependent Claim
5 words
Chain-extended polymers of claim 1.
Claim 21
Dependent Claim
24 words
A polymer of claim 19 wherein the chain extension agent is selected from the group consisting of glycols, polyamines, metal hydroxides and metal oxides.
Claim 22
Dependent Claim
27 words
A polymer of claim 19 wherein the coupling moeity is selected from the group consisting of benzoxazole, triazine, isoxazole, oxadiazole, siloxane, diurethane, triurethane, diimide, cyanurate, diamide, triamide.
Claim 23
Dependent Claim
57 words
A polymer of claim 19 wherein the coupling moiety is a carbon-carbon covalent bond joining polymer segments of the formula ##STR5## where R f is the initiator residue and can be monofunctional or difunctional, m is an integer greater than 200, and n is 1 if R f is monofunctional and 2 if R f is difunctional.
References Cited (Backward Citations)
US3242218A
Cited
US3342875A
Cited
US3250807A
Cited
US3250808A
Cited
US3412148A
Cited
US3600409A
Cited
US3555100A
Cited
US3595925A
Cited
US3660315A
Cited
US3681292A
Cited
US3733349A
Cited
US4102872A
Cited
US4142037A
Cited
US4140727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-25 | 1986-04-26 | 1986-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-25 | 1990-04-26 | 1990-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-25 | 1994-04-26 | 1994-10-26 | $7700.00 | Window Closed / Lapsed |