US4054707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulphonated polyaryl-ether-sulphones and membranes thereof
Assignee: Rhone Poulenc Industries SA
•
Filing: 1975-12-23
•
Granted: 1977-10-18
•
Expires: 1995-12-23
Abstract
Abstract Novel sulphonated polyaryl-ether-sulphone resins are described which are particularly suitable for producing semi-permeable membranes, in particular for reverse osmosis. These resins consist essentially of a plurality of units of the formula: ##STR1## and, optionally, a plurality of units of the formula: ##STR2## in which A 1 , A 2 , A 3 , A 4 and A 5 each represents a phenylene radical at least one of which is substituted by an optionally salified sulpho (--SO 3 H) radical, the relative proportions of units of formula (I) and (II) and the degree of substitution by sulpho radicals being such that the number of sulpho groups is from about 0.1 to about 5 milliequivalents per gram of dry resin.
Inventors
- 👤 Jean-Pierre Quentin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:27
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/66; B01D71/68; B01D69/00; B01D69/12; C; C08; C08G; C08G65/00; C08G65/34; C08G65/48; C08G75/00; C08G75/20; C08G75/23; C08G2650/00; C08G2650/02; C08G2650/20; C08G2650/62; C08G2650/64; C08L; C08L2312/00; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24992; Y10T428/31504; Y10T428/31533
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
103 words
A sulphonated polyaryl-ether-sulphone resin which consists essentially of a plurality of units of the formula: ##STR6## and, optionally, a plurality of units of the formula: ##STR7## in which A 1 , A 2 , A 3 , A 4 and A 5 each represents a phenylene radical at least one of which is substituted by a sulpho (--SO 3 H) or salified sulpho radical, the relative proportions of units of formula (I) and (II) and the degree of substitution by sulpho radicals being such that the number of sulpho groups is from about 0.1 to about 5 milliequivalents per gram of dry resin.
Claim 2
Dependent Claim
103 words
A sulphonated polyaryl-ether-sulphone resin which consists essentially of a plurality of units of the formula: ##STR6## and, optionally, a plurality of units of the formula: ##STR7## in which A 1 , A 2 , A 3 , A 4 and A 5 each represents a phenylene radical at least one of which is substituted by a sulpho (--SO 3 H) or salified sulpho radical, the relative proportions of units of formula (I) and (II) and the degree of substitution by sulpho radicals being such that the number of sulpho groups is from about 0.1 to about 5 milliequivalents per gram of dry resin.
Claim 3
Dependent Claim
24 words
A sulphonated polysulphone according to claim 1 which contains from about 0.6 to about 2 milliequivalents of sulpho radicals per gram of dry resin.
Claim 4
Dependent Claim
16 words
A sulphonated polysulphone according to claim 1 which is in the form of the free acid.
Claim 5
Dependent Claim
23 words
A sulphonated polysulphone according to claim 1 which is in the form of an ammonium or alkali metal or alkaline earth metal salt.
Claim 6
Dependent Claim
22 words
A sulphonated polysulphone according to claim 1 having a total number of units of formula (I) and (II) from 18 to 30.
Claim 7
Dependent Claim
15 words
A sulphonated polysulphone according to claim 1 which is in the form of a membrane.
Claim 8
Dependent Claim
37 words
A sulphonated polysulphone according to claim 6 which is in the form of an anisotropic membrane possessing a) a thin dense or micro-porous layer and b) a relatively thick layer which is more porous than layer a).
Claim 9
Dependent Claim
34 words
A sulphonated polysulphone according to claim 6 which is in the form of a composite membrane, the resin being in the form of a thin dense or microporous layer deposited on a porous support.
References Cited (Backward Citations)
US3709841A
Cited
US3554972A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-17 | 1981-04-18 | 1981-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-17 | 1985-04-18 | 1985-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-17 | 1989-04-18 | 1989-10-18 | $7700.00 | Window Closed / Lapsed |