US4714725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Membranes
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1987-04-06
•
Granted: 1987-12-22
•
Expires: 2007-04-06
Abstract
Abstract Solutions of sulphonated polyaryletherketones in a solvent mixture of at least three liquids or low melting solids which are non-solvents or poor solvents for the polymer, can be used to produce asymmetric semi-permeable membranes. The polymer may be a polymer of (Ph.sup.1 --O--Ph.sup.2 --O--Ph.sup.1 --CO) and optionally (Ph.sup.1 --O--Ph.sup.1 --CO) and (Ph.sup.1 --O--Ph.sup.1 --O--Ph.sup.1 --CO) wherein Ph 1 and Ph 2 are respectively unsulphonated and sulphonated phenylene residues. The components of the solvent mixture have specified solubility parameters. A suitable solvent mixture is one formed from water, 1,4-dioxane and acetonitrile.
Inventors
- 👤 Brian N. Hendy
- 👤 John W. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:15
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/091; B; B01; B01D; B01D67/00; B01D67/0002; B01D67/0009; B01D67/0011; B01D67/0016; B01D69/00; B01D69/02; B01D71/00; B01D71/06; B01D71/52; B01D71/522; B01D71/5221; B01D2325/00; B01D2325/02; B01D2325/022; C08J2371/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
151 words
A solution comprising a sulphonated polyaryletherketone and a solvent mixture which contains at least three components each of which is a non-solvent or poor solvent for the sulphonated polyaryletherketone and which are (a) a liquid or a low melting solid containing at least one hydroxylic group and having a delta-H with a value of at least 8; (b) a liquid or a low melting solid having a delta-D with a value of at least 8 and a delta-P with a value of not more than 3; and (c) a liquid or a low melting solid having a delta-P with a value of at least 8.5 and a delta-H with a value of not more than 3; wherein the solvent mixture forms a single liquid phase and none of the components of the solvent mixture reacts or complexes with another of the components of the solvent mixture or with the sulphonated polyaryletherketone.
Claim 2
Dependent Claim
151 words
A solution comprising a sulphonated polyaryletherketone and a solvent mixture which contains at least three components each of which is a non-solvent or poor solvent for the sulphonated polyaryletherketone and which are (a) a liquid or a low melting solid containing at least one hydroxylic group and having a delta-H with a value of at least 8; (b) a liquid or a low melting solid having a delta-D with a value of at least 8 and a delta-P with a value of not more than 3; and (c) a liquid or a low melting solid having a delta-P with a value of at least 8.5 and a delta-H with a value of not more than 3; wherein the solvent mixture forms a single liquid phase and none of the components of the solvent mixture reacts or complexes with another of the components of the solvent mixture or with the sulphonated polyaryletherketone.
Claim 3
Dependent Claim
50 words
The solution of claim 1 wherein the sulphonated polyaryletherketone contains repeat units of the formula (Ph--O).sub.m Ph--CO] I wherein Ph represents a phenylene residue wherein at least some of the groups are sulphonated; and m is 1 or 2 and the value of m can differ along the polymer chain.
Claim 4
Dependent Claim
52 words
The solution of claim 2 wherein the sulphonated polyaryletherketone is a material in which the value of m is only one or is only two or is a material in which the value of m differs along the polymer chain and is both one and two at various points along the chain.
Claim 5
Dependent Claim
83 words
The solution of claim 1 wherein the sulphonated polaryletherketone is the product obtained by sulphonating a polymer having the repeat units of the formula (Ph.sup.1 --O--Ph.sup.1 --O--Ph.sup.1 --CO) IA and optionally also including comonomer units of the formula (Ph.sup.1 --O--Ph.sup.1 --Y) II or comonomer units of the formula (Ph.sup.1 --O--Ph.sup.1 --O--Ph.sup.1 --SO.sub.2) III wherein Ph 1 is a phenylene residue; and; Y is a --CO-- or --SO 2 -- group, and the nature of Y in the units of formula II may vary.
Claim 6
Dependent Claim
90 words
The solution of claim 1 in which component (a) of the solvent mixture has a delta-H of at least 8, a delta-D of not more than 8 and a delta-P of at least 6; component (b) of the solvent mixture has a delta-D of at least 8, a delta-P of not more than 3 and a delta-H of not more than 4; and component (c) of the solvent mixture has a delta-P of at least 8.5, a delta-H of not more than 3 and a delta-D of at least 7.5.
Claim 7
Dependent Claim
45 words
The solution of claim 5 wherein the solvent mixture contains at least 20% by weight of 1,4-dioxane, at least 10% by weight of acetonitrile and not more than 40% by weight of water, the total amounts of the three components aggregating to 100% by weight.
Claim 8
Dependent Claim
26 words
The solution of claim 1 wherein at least one component of the solvent mixture is volatile and evaporates, at least partially, during casting of the solution.
References Cited (Backward Citations)
US4008203A
Cited
US3855122A
Cited
US3875096A
Cited
US4029582A
Cited
US4268650A
Cited
US4419486A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-21 | 1991-06-22 | 1991-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-21 | 1995-06-22 | 1995-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-21 | 1999-06-22 | 1999-12-22 | $7700.00 | Window Closed / Lapsed |