US4414280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Membranes and composites from fluoropolymer solutions
Assignee: EIDP Inc
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Filing: 1981-12-03
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Granted: 1983-11-08
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Expires: 2001-12-03
Abstract
Abstract Solutions and membranes formed therefrom are disclosed with solvents having completely halogenated, saturated, hydrocarbon backbones and solubility parameters within a particular range. Preferred solvent have at least one ether linkage. An exemplary solvent is ##STR1## wherein X is F, Cl, Br, and I; n is 0, 1, and 2; m is 1, 2, and 3; and Y is COOCH 3 and SO 2 F. The solutions include perfluorinated copolymers having high equivalent weight which have been prepared from tetrafluoroethylene and perfluorinated sulfonyl fluoride- or carboxyl-containing vinyl monomers.
Inventors
- 👤 Raimund H. Silva
- 👤 Paul R. Resnick
- 👤 Roger A. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:11
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/30; B01D71/32; B01D67/00; B01D67/0002; B01D67/0009; B01D67/0011; B01J; B01J31/00; B01J31/02; B01J31/06; B01J31/08; B01J31/10; C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/091; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; C08J5/2231; C08J5/2237; B01J2231/00; B01J2231/40; C08J2327/00; C08J2327/02; C08J2327/12; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
125 words
A membrane for use in liquid permeation processes made from a solution of fluoropolymer in halogenated solvent wherein: the fluoropolymer is present in an amount greater than 0.5 percent, by weight, of the solution at 25° C.; the solvent is a perhalogenated, saturated liquid having at least one alkyl segment, at least one alkyl ether segment, and at least one terminal polar group wherein the halogens in the liquid are selected from the group consisting of F, Cl, Br, and I, the alkyls have one to three carbon atoms, and the polar groups are either alkyl carboxyl ester or sulfonyl fluoride; and the fluoropolymer is a copolymer of tetrafluoroethylene and perfluorinated sulfonyl fluoride- or carboxyl-containing vinyl monomer having an equivalent weight of greater than 1000.
Claim 2
Dependent Claim
125 words
A membrane for use in liquid permeation processes made from a solution of fluoropolymer in halogenated solvent wherein: the fluoropolymer is present in an amount greater than 0.5 percent, by weight, of the solution at 25° C.; the solvent is a perhalogenated, saturated liquid having at least one alkyl segment, at least one alkyl ether segment, and at least one terminal polar group wherein the halogens in the liquid are selected from the group consisting of F, Cl, Br, and I, the alkyls have one to three carbon atoms, and the polar groups are either alkyl carboxyl ester or sulfonyl fluoride; and the fluoropolymer is a copolymer of tetrafluoroethylene and perfluorinated sulfonyl fluoride- or carboxyl-containing vinyl monomer having an equivalent weight of greater than 1000.
Claim 3
Dependent Claim
19 words
The membrane of claim 1 wherein the sulfonyl fluoride- or carboxyl-containing vinyl component of the fluoropolymer has been hydrolyzed.
Claim 4
Dependent Claim
123 words
An inert support material coated by fluoropolymer from a solution of fluoropolymer in halogenated solvent wherein: the fluoropolymer is present in an amount greater than 0.5 percent, by weight, of the solution at 25° C.; the solvent is a perhalogenated, saturated liquid having at least one alkyl segment, at least one alkyl ether segment, and at least one terminal polar group wherein the halogens in the liquid are selected from the group consisting of F, Cl, Br, and I, the alkyls have one to three carbon atoms, and the polar groups are either alkyl carboxyl ester or sulfonyl fluoride; and the fluoropolymer is a copolymer of tetrafluoroethylene and perfluorinated sulfonyl fluoride- or carboxyl-containing vinyl monomer having an equivalent weight of greater than 1000.
Claim 5
Dependent Claim
123 words
An inert support material coated by fluoropolymer from a solution of fluoropolymer in halogenated solvent wherein: the fluoropolymer is present in an amount greater than 0.5 percent, by weight, of the solution at 25° C.; the solvent is a perhalogenated, saturated liquid having at least one alkyl segment, at least one alkyl ether segment, and at least one terminal polar group wherein the halogens in the liquid are selected from the group consisting of F, Cl, Br, and I, the alkyls have one to three carbon atoms, and the polar groups are either alkyl carboxyl ester or sulfonyl fluoride; and the fluoropolymer is a copolymer of tetrafluoroethylene and perfluorinated sulfonyl fluoride- or carboxyl-containing vinyl monomer having an equivalent weight of greater than 1000.
Claim 6
Dependent Claim
25 words
The support material of claim 23 wherein the sulfonyl fluoride- or carboxyl-containing vinyl component of the fluoropolymers has been hydrolyzed to the free acid form.
References Cited (Backward Citations)
US3170954A
Cited
US3250808A
Cited
US3282875A
Cited
GB1286859A
Cited
US3692569A
Cited
US3859330A
Cited
DE2510071A1
Cited
US4065366A
Cited
US4065366B1
Cited
US4038213A
Cited
US4188354A
Cited
US4259226A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-07 | 1987-05-09 | 1987-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-07 | 1991-05-09 | 1991-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-07 | 1995-05-09 | 1995-11-08 | $7700.00 | Window Closed / Lapsed |