US4208508A
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Semipermeable membranes of polyaryl ether sulfones
Assignee: Asahi Kasei Corp
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Filing: 1978-07-07
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Granted: 1980-06-17
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Expires: 1998-07-07
Abstract
Abstract A semipermeable membrane of a polyaryl ether sulfone having repeating units of the formula, ##STR1## wherein Ar 1 and Ar 2 independently represent ##STR2## wherein X, Y and Z independently represents an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a chlorine atom or a bromine atom; and l, m and n independently represent zero or an integer of 1 to 4, and having a contact angle of its surface to water of at most 65°.
Inventors
- 👤 Yasuo Hashino
- 👤 Fusakazu Hayano
- 👤 Kenji Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:27
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/66; B01D71/68; B01D67/00; B01D67/0002; B01D67/0009; B01D67/0011; B01D69/00; B01D69/08; C; C08; C08G; C08G75/00; C08G75/20; C08G75/23
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
85 words
A semipermeable membrane of a polyaryl ether sulfone having repeating units of the formula, ##STR8## wherein Ar 1 and Ar 2 independently represent ##STR9## wherein X, Y and Z independently represent an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a chlorine atom or a bromine atom; and l, m and n independently represent zero or an integer of 1 to 4, and having a contact angle of its surface to water of at most 65°.
Claim 2
Dependent Claim
85 words
A semipermeable membrane of a polyaryl ether sulfone having repeating units of the formula, ##STR8## wherein Ar 1 and Ar 2 independently represent ##STR9## wherein X, Y and Z independently represent an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a chlorine atom or a bromine atom; and l, m and n independently represent zero or an integer of 1 to 4, and having a contact angle of its surface to water of at most 65°.
Claim 3
Dependent Claim
26 words
The semipermeable membrane as claimed in claim 1, wherein the polyaryl ether sulfone has a number average molecular weight of from about 5,000 to about 50,000.
Claim 4
Dependent Claim
20 words
The semipermeable membrane as claimed in claim 1, wherein the polyaryl ether sulfone has repeating units of the formula, ##STR10##
Claim 5
Dependent Claim
20 words
The semipermeable membrane as claimed in claim 1, wherein the polyaryl ether sulfone has repeating units of the formula, ##STR11##
Claim 6
Dependent Claim
26 words
The semipermeable membrane as claimed in claim 4, wherein the polyaryl ether sulfone has a number average molecular weight of from about 10,000 to about 30,000.
Claim 7
Dependent Claim
16 words
The semipermeable membrane as claimed in claim 1, wherein the semipermeable membrane is a flat membrane.
Claim 8
Dependent Claim
16 words
The semipermeable membrane as claimed in claim 1, wherein the semipermeable membrane is a hollow fiber.
Claim 9
Dependent Claim
128 words
A process for preparing a semipermeable membrane as claimed in claim 1 which comprises shaping a casting solution containing a polar organic solution of a polyaryl ether sulfone having repeating units of the formula ##STR12## wherein Ar 1 and Ar 2 independently represent ##STR13## wherein X, Y and Z independently represents an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a chlorine atom or a bromine atom; and l, m and n independently represents zero or an integer of 1 to 4, and an aqueous solution of an electrolyte into a membrane and contacting the membrane with a liquid which is miscible with the polar organic solvent but is a non-solvent for the polyaryl ether sulfone to effect coagulation.
Claim 10
Dependent Claim
31 words
The process as claimed in claim 8, wherein the polyaryl ether sulfone has repeating units of the formula, ##STR14## and a number average molecular weight of about 5,000 to about 50,000.
Claim 11
Dependent Claim
31 words
The process as claimed in claim 8, wherein the polyaryl ether sulfone has repeating units of the formula, ##STR15## and a number average molecular weight of about 10,000 to about 30,000.
Claim 12
Dependent Claim
29 words
The process as claimed in claim 8, wherein the polar organic solvent is at least one member selected from the group consisting of dimethyl sulfoxide, N,N-dimethylacetamide, N,N-dimethylformamide and N-methyl-2-pyrrolidone.
Claim 13
Dependent Claim
26 words
The process as claimed in claim 11, wherein the polar organic solvent is dimethyl sulfoxide or a mixture of dimethyl sulfoxide with N,N-dimethylacetamide, N,N-dimethylformamide or N-methyl-2-pyrrolidone.
Claim 14
Dependent Claim
38 words
The process as claimed in claim 8, wherein the electrolyte is at least one member selected from the group consisting of metal salts of inorganic acids, metal salts of organic acids, high molecular weight electrolytes and ionic surfactants.
Claim 15
Dependent Claim
13 words
The process as claimed in claim 13, wherein the electrolyte is sodium nitrate.
Claim 16
Dependent Claim
13 words
The process as claimed in claim 8, wherein the coagulating liquid is water.
Claim 17
Dependent Claim
31 words
The process as claimed in claim 8, wherein the concentration of the polyaryl ether sulfone in the casting solution ranges from about 5 percent by weight to 35 percent by weight.
Claim 18
Dependent Claim
32 words
The process as claimed in claim 16, wherein the concentration of the polyaryl ether sulfone in the casting solution ranges from about 10 percent by weight to about 30 percent by weight.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-06-17 | 1983-12-17 | 1984-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-17 | 1987-12-17 | 1988-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-17 | 1991-12-17 | 1992-06-17 | $7700.00 | Window Closed / Lapsed |