US4387187A
Expired / Lapsed
US
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Compatible polymer blend compositions
Assignee: Imperial Chemical Industries Ltd
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Filing: 1981-03-10
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Granted: 1983-06-07
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Expires: 2001-03-10
Abstract
Abstract A polymer composition in the form of a film which composition comprises a compatible blend of an alkylene oxide polymer such as polyethylene oxide and an aromatic polyethersulphone.
Inventors
- 👤 Alan B. Newton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:39
CPC Classifications
C; C08; C08L; C08L71/00; C08L71/02; A; A61; A61K; A61K9/00; A61K9/20; A61K9/28; A61K9/2806; A61K9/2833; A61K9/2853; B; B01; B01D; B01D71/00; B01D71/06; B01D71/52; B01D71/522; B01D71/66; B01D71/68; C08L81/00; C08L81/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
67 words
A polymer composition in the form of a film which composition comprises a compatible blend of an alkyl oxide polymer not containing units derived from a cyclic ester and an aromatic polyethersulphone, wherein said alkylene oxide polymer is an ethylene oxide homopolymer or copolymer containing only ethylene oxide and one or more different alkylene oxide units, has a molecular weight of at least 100,000, and is water-soluble.
Claim 2
Dependent Claim
67 words
A polymer composition in the form of a film which composition comprises a compatible blend of an alkyl oxide polymer not containing units derived from a cyclic ester and an aromatic polyethersulphone, wherein said alkylene oxide polymer is an ethylene oxide homopolymer or copolymer containing only ethylene oxide and one or more different alkylene oxide units, has a molecular weight of at least 100,000, and is water-soluble.
Claim 3
Dependent Claim
21 words
A polymer composition according to claim 1, wherein the alkylene oxide polymer contains at least 50 mole of ethylene oxide units.
Claim 4
Dependent Claim
28 words
A polymer composition according to claim 1 wherein the polyethersulphone has the repeat unit ##STR6## or the repeat unit ##STR7## alone or in conjunction with other repeat units.
Claim 5
Dependent Claim
30 words
A polymer composition according to claim 1 wherein the compatible blend has a composition of 5-95 weight % of alkylene oxide polymer and correspondingly 95-5 weight % of aromatic polyethersulphone.
Claim 6
Dependent Claim
30 words
A polymer composition according to claim 1 wherein the compatible blend has a composition of 2-25 weight % of alkylene oxide polymer and correspondingly 98-75 weight % of aromatic polyethersulphone.
Claim 7
Dependent Claim
14 words
A polymer composition according to claim 1 in the form of a transparent film.
Claim 8
Dependent Claim
21 words
A polymer composition according to claim 1 wherein the film has a contact angle of its surface to water of ≦60°.
Claim 9
Dependent Claim
16 words
A polymer composition according to claim 1 in the form of a porous or semi-permeable film.
Claim 10
Dependent Claim
45 words
A polymer composition according to claim 8 in the form of a porous or semi-permeable film used in a membrane separation system or as the encapsulating membrane in a system for the sustained and/or predictable release of a biologically active species in unit dosage form.
Claim 11
Dependent Claim
91 words
A process for the production of a polymer composition in the form of a film according to claim 8 which process comprises forming a film by solvent casting a composition comprising a blend of the alkylene oxide polymer not containing units derived from a cyclic ester and an aromatic polyethersulphone but allowing some of the solvent casting medium to remain in the film, and leaching the film with a liquid which is miscible with at least one component of the solvent casting medium and is also a non-solvent for the polymers.
References Cited (Backward Citations)
US3629170A
Cited
FR2176118A1
Cited
GB1416643A
Cited
GB1416144A
Cited
US4208508A
Cited
GB2020299B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-06 | 1986-12-06 | 1987-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-06 | 1990-12-06 | 1991-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-06 | 1994-12-06 | 1995-06-07 | $7700.00 | Window Closed / Lapsed |