EP0202849A2
Expired / Lapsed
EP
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Solution of polymeric material
Assignee: Imperial Chemical Industries Ltd
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Filing: 1986-05-13
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Granted: —
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Expires: 2006-05-13
Abstract
Abstract A polymer solution contains a sulphonated polyarylethersulphone in a solvent mixture containing at least two components, one of which is a hydroxy group containing compound selected from water, an alkanol or a glycol and the other of which is a ketone. The solvent mixture typically has a delta-H in the range from 3 to 8.5; a delta-P in the range from 4 to 8 and a delta-D in the range 7.2 to 9.5. Each component of the solvent mixture is a liquid or low melting solid which is a non-solvent or poor solvent for the sulphonated polyarylethersulphone. Solvent mixtures which may be used include water and methyl ethyl ketone; water and acetone and ethylene glycol and acetone. The solutions can be used to produce an asymmetric membrane.
Inventors
- 👤 Peter Townsend Cardew
- 👤 David Robert Holmes
- 👤 John William Smith
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 21:11
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/091; B; B01; B01D; B01D67/00; B01D67/0002; B01D67/0009; B01D67/0011; B01D67/0013; B01D67/0016; B01D67/00165; B01D71/00; B01D71/06; B01D71/66; B01D71/68; B01D2325/00; B01D2325/02; B01D2325/022; B01D2325/04; C08J2381/00; C08J2381/06
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
67 words
A solution of a sulphonated polyarylethersulphone in a solvent mixture wherein the solvent mixture contains at least two components, each of which is a liquid or a low melting solid which is a non-solvent or poor solvent for the sulphonated polyarylethersulphone, and one of which is a hydroxy group containing compound selected from water, an alkanol or a glycol and the other of which is a ketone.
Claim 2
Dependent Claim
67 words
A solution of a sulphonated polyarylethersulphone in a solvent mixture wherein the solvent mixture contains at least two components, each of which is a liquid or a low melting solid which is a non-solvent or poor solvent for the sulphonated polyarylethersulphone, and one of which is a hydroxy group containing compound selected from water, an alkanol or a glycol and the other of which is a ketone.
Claim 3
Dependent Claim
40 words
A solution as claimed in claim 1 wherein the solvent mixture has a delta-H in the range from 3 to 8.5; a delta-P in the range from 4 to 8 and a delta-D in the range from 7.2 to 9.5.
Claim 4
Dependent Claim
54 words
A solution as claimed in either claim 1 or claim 2 wherein, at least in the presence of the sulphonated polyarylethersulphone, the solvent mixture forms a single liquid phase and none of the components of the solvent mixture reacts or complexes with any other component of the solvent mixture or with the sulphonated polyarylethersulphone.
Claim 5
Dependent Claim
35 words
A solution as claimed in any one of claims I to 3 wherein the solvent mixture consists of one component which is the hydroxy group containing compound and a second component which is the ketone.
Claim 6
Dependent Claim
62 words
A solution as claimed in claim 4 wherein the solvent mixture consists of two components which are such that a) one component has a delta-P of less than 6 and the other component has a delta-P of at least 6; and/or b) one component has a delta-H of less than 5 and the other component has a delta-H of at least 5.
Claim 7
Dependent Claim
23 words
A solution as claimed in claim 5 wherein the solvent mixture consists of two components which satisfy both of conditions (a) and (b).
Claim 8
Dependent Claim
51 words
A solution as claimed in any one of claims 4 to 6 wherein one component of the solvent mixture has a delta-P of less than 6 and a delta-H of less than 5 and the other component has a delta-P of at least 6 and a delta-H of at least 5.
Claim 9
Dependent Claim
29 words
A solution as claimed in any one of claims 1 to 7 wherein each component of the solvent mixture has a TLV of not less than about 100 ppm.
Claim 10
Dependent Claim
31 words
A solution as claimed in any one of claims 1 to 8 wherein the solvent mixture consists of methyl ethyl ketone and water; acetone and water; or ethylene glycol and acetone.
Claim 11
Dependent Claim
56 words
A solution as claimed in any one of claims 1 to 9 wherein the sulphonated polyarylethersulphone has repeating units of the formula I wherein Ph represents a phenylene residue wherein at least some of the groups Ph are sulphonated; and n is 1 or 2 and the value of n can differ along the polymer chain.
Claim 12
Dependent Claim
110 words
A solution as claimed in claim 10-wherein the sulphonated polyarylethersulphone is a material having repeat units of the formula together with repeat units of the formula and optionally units of the formula wherein 1 Ph represents a phenylene residue; 2 Ph represents a phenylene residue having one or two groups - SO M; 3 M is a hydrogen atom, a metal atom and/or a group NR , 4 wherein the groups M may be the same or different and the proportion of the groups M is sufficient to combine with the unsatisfied valencies of the group - SO 3 ; and R is a hydrogen atom or an alkyl group
Claim 13
Independent Claim
81 words
A method for the production of an asymmetric semi-permeable membrane which method comprises forming a solution of a sulphonated polyarylethersulphone in a solvent mixture, casting the solution on a support to form a film on the support, immersing, in a coagulation bath, the cast film of the solution on the support and recovering a membrane from the coagulation bath, wherein the solution of the sulphonated polyarylethersulphone in the solvent mixture is as claimed in any one of claims 1 to 11.
Claim 14
Dependent Claim
21 words
A method as claimed in claim 12 wherein the coagulation bath is water or an aqueous solution of a metal salt.
Claim 15
Dependent Claim
23 words
An asymmetric semi-permeable membrane of thickness 50 up to 250 micrometres whenever obtained by the method of either claim 12 or claim 13.
Claim 16
Dependent Claim
48 words
A process for the desalination of sea water or for the - purification of water including brackish waters or industrial effluents by effecting reverse osmosis or ultrafiltration using a membrane as claimed in claim 14 or as obtained by the process of either claim 12 or claim 13.
References Cited (Backward Citations)
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