Patent US2871883A successfully refreshed from Google Patents.
Patent US4762680A successfully refreshed from Google Patents.
Patent US4808651A successfully refreshed from Google Patents.
US4808651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solutions of fluoropolymers, and their use
Assignee: Hoechst AG
•
Filing: 1987-09-15
•
Granted: 1989-02-28
•
Expires: 2007-09-15
Abstract
Abstract The invention relates to solutions of fluoropolymers which preferably contain carbonate groups, in solvents of the general formula (I) <IMAGE> (I) These solutions are suitable, in particular, for the production of membranes for liquid permeation processes, such as electrolysis.
Inventors
- 👤 Peter Blickle
- 👤 Klaus Hintzer
- 👤 Gernot Lohr
- 👤 Werner Schwertfeger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:20
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; C08J5/2231; C08J5/2237; B; B01; B01D; B01D65/00; B01D65/10; B01D65/106; B01D65/108; B01D67/00; B01D67/0002; B01D67/0009; B01D67/0011; B01D67/00111; B01D71/00; B01D71/06; B01D71/30; B01D71/32; C08J3/00; C08J3/02; C08J3/09; C08J3/091; C08J3/095; B01D2323/00; B01D2323/12; C08J2327/00; C08J2327/02; C08J2327/12
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
156 words
A solution of a fluoropolymer in a halogen-containing solvent, wherein the solvent has the formula (I) ##STR26## in which R f denotes F or perfluoroalkyl having 1-3 carbon atoms, X denotes hydrogen, F, Cl, Br or I, n denotes an integer from 0-10, m denotes a number from 0-5, and R f ' equals --CF 2 --O--CFY--CF 2 Y, --CFY--CF 2 Y or --CF 2 Y, or denotes ##STR27## in which R f ", n' and m' have the same meaning as R f , n and m, X' denotes hydrogen, Cl, Br or I, and Y denotes Cl or Br, with the proviso that the boiling point of this solvent at atmospheric pressure is at most 190° C. if at least one of the radicals X, X' or Y does not represent hydrogen, and with the further proviso that, where R f ' equals --CFY--CF 2 Y or CF 2 Y, m denotes only 0.
Claim 2
Dependent Claim
156 words
A solution of a fluoropolymer in a halogen-containing solvent, wherein the solvent has the formula (I) ##STR26## in which R f denotes F or perfluoroalkyl having 1-3 carbon atoms, X denotes hydrogen, F, Cl, Br or I, n denotes an integer from 0-10, m denotes a number from 0-5, and R f ' equals --CF 2 --O--CFY--CF 2 Y, --CFY--CF 2 Y or --CF 2 Y, or denotes ##STR27## in which R f ", n' and m' have the same meaning as R f , n and m, X' denotes hydrogen, Cl, Br or I, and Y denotes Cl or Br, with the proviso that the boiling point of this solvent at atmospheric pressure is at most 190° C. if at least one of the radicals X, X' or Y does not represent hydrogen, and with the further proviso that, where R f ' equals --CFY--CF 2 Y or CF 2 Y, m denotes only 0.
Claim 3
Dependent Claim
19 words
A solution as claimed in claim 1, wherein X in the formula (I) denotes hydrogen, F, Cl or Br.
Claim 4
Dependent Claim
25 words
A solution as claimed in claim 1, wherein n represents an integer from 0 to 6 and m represents an integer from 0 to 3.
Claim 5
Dependent Claim
16 words
A solution as claimed in claim 1, wherein R f ' has the meaning of ##STR28##
Claim 6
Dependent Claim
19 words
A solution as claimed in claim 1, wherein the boiling point of the solvent is at most 180° C.
Claim 7
Dependent Claim
20 words
A solution as claimed in claim 1, wherein the solids content of the fluoropolymer is 0.5 to 30% by weight.
Claim 8
Dependent Claim
63 words
A solution as claimed in claim 1, wherein the fluoropolymer contains at least repeating units (C) ##STR29## in which u denotes 0, 1 or 2, v denotes 0 or 1, w denotes 1 to 7, A' and B', independently of one another, denote F or CF 3 and D denotes hydrogen, Cl, Br or --COOR where R denotes C 1 -C 10 -alkyl.
Claim 9
Dependent Claim
33 words
A solution as claimed in claim 7, wherein u is at least equal to 0 and/or v is equal to 1 and wherein the content of units (C) is 10 to 50 mol-%.
Claim 10
Dependent Claim
52 words
A solution as claimed in claims 1, wherein the fluoropolymer also contains repeating units (D) --CF.sub.2 --CFE (D) where E represents Cl, F, R f or OR f , and R f denotes the CF 3 radical or a C 2 -C 8 -perfluoroalkyl radical which is optinally interrupted by oxygen atoms.
Claim 11
Dependent Claim
52 words
A solution as claimed in claim 1, wherein the fluoropolymer comprise the repeating unit (C) ##STR30## and the repeating unit (D) --CF 2 --CF 2 -- in the case of bipolymers or --CF 2 --CF 2 -- and --CF--CFE-- (E=the above meaning with the exception of F) in the case of terpolymers.
Claim 12
Dependent Claim
21 words
A solution as claimed in claim 1, wherein the molecular weight (number average) of the fluoropolymers is between 50,000 and 1,000,000.
Claim 13
Dependent Claim
35 words
A solution as claimed in claim 1, wherein the fluoropolymer contains groups of the formula (A) and/or (B) --SO.sub.2 F (A) --CG (B) where G represents OOR where R equals C 1 -C 10 -alkyl.
Claim 14
Dependent Claim
10 words
Membrane produced from a solution as claimed in claim 1.
Claim 15
Dependent Claim
14 words
Membrane as claimed in claim 13 for liquid permeation processes or ion exchange processes.
Claim 16
Dependent Claim
21 words
Membrane as claimed in claim 14, wherein the liquid permeation process is electrolysis, in particular electrolysis of aqueous sodium chloride solution.
Claim 17
Dependent Claim
15 words
Membrane as claimed in claim 14, wherein the liquid permeation process is hyper- or ultrafiltration.
Claim 18
Dependent Claim
11 words
Repaired membrane obtained with a solution as claimed in claim 1.
Claim 19
Dependent Claim
14 words
Coatings on intert base materials prepared from a solution as claimed in claim 1.
Claim 20
Dependent Claim
21 words
A wettable surface obtained by treatment of a substrate containing a non-wettable surface with a solution as claimed in claim 12.
Claim 21
Dependent Claim
24 words
A solution as claimed in claim 1, wherein R f ' is --CF 2 --O--CFY--CF 2 Y, --CFY--CF 2 Y, or --CF 2 Y.
Claim 22
Dependent Claim
19 words
A solution as claimed in claim 1, wherein X denotes hydrogen, Cl, or Br, and R f denotes F.
Claim 23
Dependent Claim
12 words
A solution as claimed in claim 1, wherein R f is ##STR31##
Claim 24
Dependent Claim
11 words
A solution as claimed in claim 22, wherein m' is zero.
Claim 25
Dependent Claim
14 words
A solution as claimed in claim 22 wherein X and X' are both hydrogen.
Claim 26
Dependent Claim
14 words
A solution as claimed in claim 23, wherein X and X' are both hydrogen.
References Cited (Backward Citations)
US3740369A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-28 | 1992-08-29 | 1993-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-28 | 1996-08-29 | 1997-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-28 | 2000-08-29 | 2001-02-28 | $7700.00 | Window Closed / Lapsed |