US4419486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulphonated polyaryletherketones
Assignee: North West Water Group PLC
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Filing: 1981-05-26
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Granted: 1983-12-06
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Expires: 2001-05-26
Abstract
Abstract A polyaryletherketone polymer which is a hydrophilic sulphonated polymer derived by controllably sulphonating a copolymer having the repeat unit of formula ##STR1## together with the repeat unit of formula ##STR2## at least 70% (preferably substantially all) of the units A being sulphonated after sulphonation and substantially all the units B remaining non-sulphonated after sulphonation. The sulphonation may be effected using 98% w/w concentrated sulphuric acid at an elevated temperature.
Inventors
- 👤 John B. Rose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:04
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/48; B; B01; B01D; B01D71/00; B01D71/06; B01D71/52; B01D71/522; B01D71/5222; C08G61/00; C08G61/12; C08G61/127
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
82 words
A polyaryletherketone copolymer which is a hydrophilic sulphonated copolymer derived by controllably sulphonating a copolymer with concentrated sulfuric acid (98% w/w) at ≧50° C., said copolymer having repeat units of formula ##STR10## together with repeat units of formula ##STR11## at leat 70% of the units A being sulphonated after sulphonation and substantially all the units B remaining non-sulphonated after sulphonation, the control being effected by varying the proportion of the repeat units B in the copolymer of repeat units A and B.
Claim 2
Dependent Claim
82 words
A polyaryletherketone copolymer which is a hydrophilic sulphonated copolymer derived by controllably sulphonating a copolymer with concentrated sulfuric acid (98% w/w) at ≧50° C., said copolymer having repeat units of formula ##STR10## together with repeat units of formula ##STR11## at leat 70% of the units A being sulphonated after sulphonation and substantially all the units B remaining non-sulphonated after sulphonation, the control being effected by varying the proportion of the repeat units B in the copolymer of repeat units A and B.
Claim 3
Dependent Claim
18 words
A polyaryletherketone copolymer according to claim 1 in which substantially all the units A are sulphonated after sulphonation.
Claim 4
Dependent Claim
34 words
A polyaryletherketone copolymer according to claim 1 wherein the copolymer which is sulphonated has 5 to 80 mole % of repeat units A and correspondingly 95 to 20 mole % of repeat units B.
Claim 5
Dependent Claim
29 words
A polyaryletherketone copolymer according to claim 1 having a hydrophilicity corresonding to a water absorption capacity at ambient temperature of 2 weight % water to complete solubility in water.
Claim 6
Dependent Claim
26 words
A polyaryletherketone copolymer according to claim 4 having a hydrophilicity corresponding to a water absorption capacity at ambient temperature of 5 to 30 weight % water.
Claim 7
Dependent Claim
37 words
A polyaryletherketone copolymer according to claim 1 in which the sulphonyl groups on the copolymer have the formula --SO 2 OY where Y is H, an alkali metal, or NR 4 where R is an alkyl group.
Claim 8
Dependent Claim
14 words
A polyaryletherketone copolymer according to claim 1 in the form of a membrane material.
Claim 9
Dependent Claim
87 words
A process for the production of a hydrophilic sulphonated polyaryletherketone copolymer which comprises controllably sulphonating using concentrated sulphuric acid (98% w/w) at ≧50° C. a copolymer having repeat units of formula ##STR12## together with repeat units of formula ##STR13## to produce a sulphonated copolymer in which at least 70% of the repeat units A are sulphonated and substantially all the repeat units B are non-sulphonated, the control being effected by varying the proportion of the repeat units B in the copolymer of repeat units A and B.
Claim 10
Dependent Claim
87 words
A process for the production of a hydrophilic sulphonated polyaryletherketone copolymer which comprises controllably sulphonating using concentrated sulphuric acid (98% w/w) at ≧50° C. a copolymer having repeat units of formula ##STR12## together with repeat units of formula ##STR13## to produce a sulphonated copolymer in which at least 70% of the repeat units A are sulphonated and substantially all the repeat units B are non-sulphonated, the control being effected by varying the proportion of the repeat units B in the copolymer of repeat units A and B.
Claim 11
Dependent Claim
22 words
A process according to claim 8 wherein a sulphonated copolymer in which substantially all the repeat units A are sulphonated is produced.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |