Patent US4249000A successfully refreshed from Google Patents.
US4249000A
Expired / Lapsed
US
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Modified polymers
Assignee: Novartis Corp
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Filing: 1979-02-21
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Granted: 1981-02-03
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Expires: 1999-02-21
Abstract
Abstract Polymers from the group consisting of cellulose and its ester and ether derivatives, of polyvinyl alcohol and its ester derivatives, polymers with vinyl esters and homopolymers and copolymers of acrylates and methacrylates are modified with monofunctional or difunctional cyclic β-ketonic acids or their esters, in particular with succinylsuccinic acid or its ester derivatives. The modified polymers are particularly suitable for obtaining semi-permeable membranes for osmotic separation methods.
Inventors
- 👤 Hans Batzer
- 👤 Joel Sinnreich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:22
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/08; B01D71/12; B01D71/14; B01D71/18; B01D71/76; B01D71/82; C; C08; C08B; C08B13/00; C08B3/00; C08B3/16; C08F; C08F8/00; C08F8/14
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
66 words
A polymer selected from the group consisting of cellulose ester and cellulose ether derivatives, polyvinyl alcohol and ester derivatives thereof, copolymers of polyvinyl alcohol and vinyl esters, copolymers of vinyl esters with one or more α-olefin comonomers, and homopolymers and copolymers of acrylates and methacrylates, said polymer containing radicals of a cyclic monofunctional or difunctional β-ketonic acid or its esters which are bonded through ester groups.
Claim 2
Dependent Claim
66 words
A polymer selected from the group consisting of cellulose ester and cellulose ether derivatives, polyvinyl alcohol and ester derivatives thereof, copolymers of polyvinyl alcohol and vinyl esters, copolymers of vinyl esters with one or more α-olefin comonomers, and homopolymers and copolymers of acrylates and methacrylates, said polymer containing radicals of a cyclic monofunctional or difunctional β-ketonic acid or its esters which are bonded through ester groups.
Claim 3
Dependent Claim
20 words
A polymer according to claim 1 which is selected from the group consisting of cellulose ester and cellulose ether derivatives.
Claim 4
Dependent Claim
19 words
A polymer according to claim 2 wherein the cellulose ester or cellulose ether derivative additionally contains free hydroxyl groups.
Claim 5
Dependent Claim
31 words
A polymer according to claim 1 wherein the radicals are derived from a cyclic β-ketonic acid selected from the group consisting of 1-carboxycyclopentan-2-one, 1,4-dicarboxycyclopentan-2,3-dione, 1,3-dicarboxycyclopentan-2,3-dione, 1,3-dicarboxycyclopentan-2,4-dione, 2,3-dicarboxycyclohexan-1,4-dione, 3,5-dicarboxycyclohexan-2,6-dione, 1-carboxycyclohexan-2-one or 3,6-dicarboxycyclohexan-1,4-dione.
Claim 6
Dependent Claim
129 words
A polymer according to claim 1 wherein the radicals of the cyclic β-ketonic acid are radicals of 3,6-dicarboxycyclohexan-1,4-dione or its ester derivatives of the formula ##STR2## wherein R represents alkylene, cycloalkylene, benzylene, xylylene, phenylene or cyclohexane-1,4-dimethylene, R' represents alkyl, hydroxyalkyl, cycloalkyl, aryl, alkaryl or aralkyl; and x in the case of cellulose derivatives, polyvinyl alcohol or derivatives is 0, and, in the case of acrylate or methacrylate homopolymers or copolymers is 1; and wherein the average number of radicals of the cyclic β-ketonic acid or its ester derivatives that is bonded to the cellulose polymer is up to 1 radical per cellulose monomer unit; or that is bonded to the vinyl alcohol, vinyl ester, acrylate or methacrylate homopolymer or copolymer is up to 1 radical per functional monomer unit.
Claim 7
Dependent Claim
28 words
A polymer according to claim 5 wherein R is linear or branched alkylene of 2 to 12 carbon atoms, or is cycloalkylene of 5 to 7 carbon atoms.
Claim 8
Dependent Claim
16 words
A polymer according to claim 6 wherein R is alkylene of 2 to 6 carbon atoms.
Claim 9
Dependent Claim
16 words
A polymer according to claim 7 wherein R is alkylene of 2 to 4 carbon atoms.
Claim 10
Dependent Claim
36 words
A polymer according to claim 5 wherein the average number of radicals of the cyclic β-ketonic acid or its ester derivatives bonded to the cellulose polymer is from 0.01 to 1 radical per cellulose monomer unit.
Claim 11
Dependent Claim
37 words
A polymer according to claim 9 wherein the average number of radicals of the cyclic β- ketonic acid or its ester derivatives bonded to the cellulose polymer is from 0.05 to 0.8 radical per cellulose monomer unit.
Claim 12
Dependent Claim
36 words
A polymer according to claim 10 wherein the average number of radicals of the cyclic β-ketonic acid or its ester derivatives bonded to the cellulose polymer is from 0.1 to 0.5 radical per cellulose monomer unit.
Claim 13
Dependent Claim
44 words
A polymer according to claim 5 wherein the average number of radicals of the cyclic β-ketonic acid or its ester derivatives bonded to the vinyl alcohol, vinyl ester, acrylate or methacrylate homopolymer or copolymer is from 0.01 to 1 radical per functional monomer unit.
Claim 14
Dependent Claim
44 words
A polymer according to claim 12 wherein the average number of radicals of the cyclic β-ketonic acid or its ester derivatives bonded to the vinyl alcohol, vinyl ester, acrylate or methacrylate homopolymer or copolymer is from 0.05 to 0.9 radical per functional monomer unit.
Claim 15
Dependent Claim
44 words
A polymer according to claim 13 wherein the average number of radicals of the cyclic β-ketonic acid or its ester derivatives bonded to the vinyl alcohol, vinyl ester, acrylate or methacrylate homopolymer or copolymer is from 0.1 to 0.5 radical per functional monomer unit.
Claim 16
Dependent Claim
18 words
A polymer according to claim 1 which is selected from the homopolymers and copolymers of acrylates and methacrylates.
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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) | 1984-02-03 | 1984-08-04 | 1985-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-03 | 1988-08-04 | 1989-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-03 | 1992-08-04 | 1993-02-03 | $7700.00 | Window Closed / Lapsed |