US4990338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antimicrobial superabsorbent compositions and methods
Assignee: Dow Silicones Corp
•
Filing: 1988-05-09
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Granted: 1991-02-05
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Expires: 2008-05-09
Abstract
Abstract An antimicrobial superabsorbent composition of a cross-linked hydrophilic sodium salt form of a partially neutralized acrylic acid-based polymer gel having covalently bonded thereto a silane. The composition can be in the form of flakes, strips, powders, filaments, fibers, or films, and may be applied to a substrate in the form of a coating.
Inventors
- 👤 Lynne M. B. Blank
- 👤 Thomas D. Boyce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:28
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; A01; A01N; A01N25/00; A01N25/08; A01N25/10; A01N55/00; A61L15/20; A61L15/46; A61P; A61P17/00; A61L2300/00; A61L2300/20; A61L2300/204; A61L2300/208; A61L2300/40; A61L2300/404
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
183 words
An antimicrobial superabsorbent composition comprising a water absorbing cross-linked hydrophilic sodium salt form of a partially neutralized acrylic acid-based polymer gel having covalently bonded thereto an organosilane, the organosilane being present in an amount to prevent hydrophobing and reduction of the absorbent capacity of the polymer gel, the organosilane having the general formula selected from the group consisting of ##STR4## wherein, in each formula, R is an alkyl radical of 1 to 4 carbon atoms or hydrogen; a has a value of 0, 1 or 2; R' is a methyl or ethyl radical; R" is an alkylene group of 1 to 4 carbon atoms; R'", R"" and R v are each independently selected from a group consisting of alkyl radicals of 1 to 18 carbon atoms, --CH 2 C 6 H 5 , --CH 2 CH 2 OH, --CH 2 OH, and --(CH 2 ) x NHC(O)R vi , wherein x has a value of from 2 to 10 and R vi is a perfluoroalkyl radical having from 1 to 12 carbon atoms; and X is chloride, bromide, fluoride, iodide, acetate or tosylate.
Claim 2
Dependent Claim
183 words
An antimicrobial superabsorbent composition comprising a water absorbing cross-linked hydrophilic sodium salt form of a partially neutralized acrylic acid-based polymer gel having covalently bonded thereto an organosilane, the organosilane being present in an amount to prevent hydrophobing and reduction of the absorbent capacity of the polymer gel, the organosilane having the general formula selected from the group consisting of ##STR4## wherein, in each formula, R is an alkyl radical of 1 to 4 carbon atoms or hydrogen; a has a value of 0, 1 or 2; R' is a methyl or ethyl radical; R" is an alkylene group of 1 to 4 carbon atoms; R'", R"" and R v are each independently selected from a group consisting of alkyl radicals of 1 to 18 carbon atoms, --CH 2 C 6 H 5 , --CH 2 CH 2 OH, --CH 2 OH, and --(CH 2 ) x NHC(O)R vi , wherein x has a value of from 2 to 10 and R vi is a perfluoroalkyl radical having from 1 to 12 carbon atoms; and X is chloride, bromide, fluoride, iodide, acetate or tosylate.
Claim 3
Dependent Claim
21 words
The composition of claim 1 wherein the organosilane is represented by the formula (CH.sub.3 O).sub.3 Si(CH.sub.2).sub.3 N.sup.+ (CH.sub.3).sub.2 C.sub.18 H.sub.37 Cl.sup.-
Claim 4
Dependent Claim
20 words
The composition of claim 1 wherein the organosilane is represented by the formula (CH.sub.3 O).sub.3 Si(CH.sub.2).sub.3 N.sup.+ (C.sub.10 H.sub.21).sub.2 (CH.sub.3)Cl.sup.-
Claim 5
Dependent Claim
15 words
The composition of claim 1 in the form of flakes, strips, powders, filaments, or fibers.
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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) | 1994-02-04 | 1994-08-06 | 1995-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-04 | 1998-08-06 | 1999-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-04 | 2002-08-06 | 2003-02-05 | $7700.00 | Window Closed / Lapsed |