Patent US5393798A successfully refreshed from Google Patents.
US5393798A
Expired / Lapsed
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Hydrogel material and method of preparation
Assignee: Bank of America NA
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Filing: 1992-06-05
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Granted: 1995-02-28
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Expires: 2012-06-05
Abstract
Abstract Hydrogel materials suitable for use in bandages and the like have been made from modified copolymers of poly(methyl vinyl ether/maleic anhydride). The modifying groups are three to seven carbon amines, amides or alcohols having a terminal vinyl group which may crosslink to other such modifiers or to intermediary difunctional coagents. A method for REDOX initiated crosslinking and continuous casting of the hydrogel, on a support material suitable for employment in a bandage, is also disclosed.
Inventors
- 👤 Fredric J. Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:17
CPC Classifications
C; C08; C08F; C08F222/00; C08F222/04; C08F222/06; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/24; A61L15/42; A61L15/60; C08F216/00; C08F216/12; C08F216/14; C08F216/16; C08F216/18; C08F8/00; C08F8/14; C08F8/30; C08F8/32; C08F2810/00; C08F2810/30
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
133 words
A hydrogel material comprising crosslinked copolymer chains of alkyl vinyl ether and maleic anhydride wherein said copolymer chains comprise the repeated structural unit: ##STR5## wherein n is an integer greater than one representing the number of said structural units in each of said copolymer chains, Y is an alkyl group having one to three carbon atoms, and wherein R is a modifying group selected from the group consisting of -NH--(CH 2 ) 1-5 --CH═CH 2 and ##STR6## Z is selected from one bivalent oxygen atom, two hydroxyl groups or one hydroxyl group and one R group, and wherein one of said copolymer chains is crosslinked to another of said copolymer chains via linkage of an R group of one of said copolymer chains with an R group of another of said copolymer chains.
Claim 2
Dependent Claim
133 words
A hydrogel material comprising crosslinked copolymer chains of alkyl vinyl ether and maleic anhydride wherein said copolymer chains comprise the repeated structural unit: ##STR5## wherein n is an integer greater than one representing the number of said structural units in each of said copolymer chains, Y is an alkyl group having one to three carbon atoms, and wherein R is a modifying group selected from the group consisting of -NH--(CH 2 ) 1-5 --CH═CH 2 and ##STR6## Z is selected from one bivalent oxygen atom, two hydroxyl groups or one hydroxyl group and one R group, and wherein one of said copolymer chains is crosslinked to another of said copolymer chains via linkage of an R group of one of said copolymer chains with an R group of another of said copolymer chains.
Claim 3
Dependent Claim
12 words
The hydrogel material of claim 1 wherein Y is --CH 3 .
Claim 4
Dependent Claim
16 words
The hydrogel material of claims 1 or 2 wherein R is --NH--CH 2 --CH═CH 2 ).
Claim 5
Dependent Claim
11 words
The hydrogel material of claims 1 or 2 wherein R ##STR7##
Claim 6
Dependent Claim
29 words
The hydrogel material of claim 1 wherein from about 15% to about 100% of the maleic anhydride portion of said copolymer are modified by reaction with said modifying group.
Claim 7
Dependent Claim
119 words
A hydrogel material comprising crosslinked copolymer chains of alkyl vinyl ether and maleic anhydride, each of said copolymer chains comprises the repeated structural unit: ##STR8## wherein n is an integer greater than one representing the number of said structural unit in each of said copolymer chains, Y is an alkyl group having one to three carbon atoms, Z is selected from one bivalent oxygen atom, two hydroxyl groups or one hydroxyl group and one R group, R is an unsaturated alcohol radical, and wherein one of said copolymer chains is crosslinked to another of said copolymer chains via linkage of an R group of one of said copolymer chains with an R group of another of said copolymer chains.
Claim 8
Dependent Claim
119 words
A hydrogel material comprising crosslinked copolymer chains of alkyl vinyl ether and maleic anhydride, each of said copolymer chains comprises the repeated structural unit: ##STR8## wherein n is an integer greater than one representing the number of said structural unit in each of said copolymer chains, Y is an alkyl group having one to three carbon atoms, Z is selected from one bivalent oxygen atom, two hydroxyl groups or one hydroxyl group and one R group, R is an unsaturated alcohol radical, and wherein one of said copolymer chains is crosslinked to another of said copolymer chains via linkage of an R group of one of said copolymer chains with an R group of another of said copolymer chains.
Claim 9
Dependent Claim
19 words
The hydrogel material of claim 6 wherein said unsaturated alcohol radical is --O--(CH 2 ) 1-5 --CH═CH 2 .
Claim 10
Dependent Claim
16 words
The hydrogel material of claim 7 wherein said unsaturated alcohol radical is allyl alcohol or 3-butene-1-ol.
Claim 11
Dependent Claim
25 words
The hydrogel material of claim 5, wherein about 40%-100% of the maleic acid portion of said copolymer is modified by reaction with said modifying group.
Claim 12
Dependent Claim
25 words
The hydrogel material of claim 6, wherein about 40%-100% of the maleic acid portion of said copolymer is modified by reaction with said modifying group.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1998-02-27 | 1998-08-29 | 1999-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-27 | 2002-08-29 | 2003-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-27 | 2006-08-29 | 2007-02-28 | $7700.00 | Window Closed / Lapsed |