Patent EP0289869A2 successfully refreshed from Google Patents.
EP0289869A2
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EP
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Low equivalent weight sulfonic fluoropolymers
Assignee: Dow Chemical Co
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Filing: 1988-04-20
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Granted: —
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Expires: 2008-04-20
Abstract
Abstract The invention is a sulfonic fluoropolymer having a fluoropolymer backbone having pendant groups attached thereto and represented by the general formula: ZSO₂-(CF₂) a -(CFR f ) b -O- where: Z is selected from a halogen, an alkali metal, hydrogen, or OR; R is a branched or linear alkyl radical having from 1 to 10 carbon atoms or an aryl radical; a is 0-2; b is 0-2; provided a + b is not equal to 0; R f is selected from -F, -Cl, perfluoroalkyl radials having from 1 to 10 carbon atoms and fluorochloroalkyl radicals having from 1 to 10 carbon atoms, wherein the sulfonic fluoropolymer has an equivalent weight of less than 800, and a hydration product of less than 29,000.
Inventors
- 👤 Bobby R. Ezzell
- 👤 William P. Carl
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 23:12
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B27/28; B32B27/286; B32B27/322; C; C08; C08F; C08F214/00; C08F214/18; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31551; Y10T428/31573; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
122 words
A sulfonic fluoropolymer having a fluoropolymer backbone having pendant groups attached thereto and represented by the general formula: ZSO₂-(CF₂) a -(CFR f ) b -O- where: Z is selected from a halogen, an alkali metal, hydrogen, or OR; R is a branched or linear alkyl radical having from 1 to 10 carbon atoms or an aryl radical; a is 0-2; b is 0-2; provided a + b is not equal to 0; R f is selected from -F, -Cl, perfluoroalkyl radicals having from 1 to 10 carbon atoms and fluorochloroalkyl radicals having from 1 to 10 carbon atoms, wherein the sulfonic fluoropolymer has an equivalent weight of less than 800, and a hydration product of less than 29,000, when Z is hydrogen.
Claim 2
Dependent Claim
122 words
A sulfonic fluoropolymer having a fluoropolymer backbone having pendant groups attached thereto and represented by the general formula: ZSO₂-(CF₂) a -(CFR f ) b -O- where: Z is selected from a halogen, an alkali metal, hydrogen, or OR; R is a branched or linear alkyl radical having from 1 to 10 carbon atoms or an aryl radical; a is 0-2; b is 0-2; provided a + b is not equal to 0; R f is selected from -F, -Cl, perfluoroalkyl radicals having from 1 to 10 carbon atoms and fluorochloroalkyl radicals having from 1 to 10 carbon atoms, wherein the sulfonic fluoropolymer has an equivalent weight of less than 800, and a hydration product of less than 29,000, when Z is hydrogen.
Claim 3
Dependent Claim
117 words
The sulfonic fluoropolymer of Claim 1, wherein the sulfonic fluoropolymer is a copolymer represented by general formulas (I) and (II): (I) CF₂=CZZ′ where: Z and Z′ are independently selected from -H, -Cl, -F, or -CF₃, and (II) ZSO₂-(CF₂) a -(CFR f ) b -O-CF=CF₂ where: Z is selected from a halogen, an alkali metal, hydrogen, or OR; R is a branched or linear alkyl radical having from 1 to 10 carbon atoms or an aryl radical; a is 0-2; b is 0-2; provided a + b is not equal to 0; R f is selected from -F, -Cl, perfluoroalkyl radicals having from 1 to 10 carbon atoms or fluorochloroalkyl radicals having from 1 to 10 carbon atoms.
Claim 4
Dependent Claim
19 words
The sulfonic fluoropolymer of Claim 2, wherein R f is F; and a + b is 2 or 3.
Claim 5
Dependent Claim
12 words
The sulfonic fluoropolymer of Claim 3, wherein a + b is 2.
Claim 6
Dependent Claim
87 words
The sulfonic fluoropolymer of Claim 2, including a third monomer represented by the general formula: (III) Y-(CF₂) a′ -(CFR f ) b′ -CFR f′ -O-[CF(CF₂X)CF₂-O-]n-CF=CF₂ where: Y is selected from -F, -Cl or -Br; a′ and b′ are independently 0-3; n is 0-6; R f and R f′ are independently selected from -Br, -Cl, -F, perfluoroalkyl radicals having from 1 to 10 carbon atoms, or chloroperfluoroalkyl radicals having from 1 to 10 carbon atoms; and X is selected from -F, -Cl, -Br, or mixtures thereof when n>1.
Claim 7
Dependent Claim
33 words
The sulfonic fluoropolymer of any one of Claims 1 to 5, wherein the hydration product is from 29,000 to 15,000 when Z is hydrogen, and the equivalent weight is from 800 to 575.
Claim 8
Dependent Claim
34 words
A laminated composite film comprising a fluoropolymer film having sulfonic or carboxylic ion exchange active groups in one layer and, as the other layer, the sulfonic fluoropolymer of any one of the preceding claims.
References Cited (Backward Citations)
No citation records indexed.
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