Patent US5328939A successfully refreshed from Google Patents.
US5328939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rigid materials having high surface area and low density
Assignee: Honeywell UOP LLC
•
Filing: 1993-04-27
•
Granted: 1994-07-12
•
Expires: 2013-04-27
Abstract
Abstract This invention relates to highly porous, crosslinked bodies derived from nitrogen-containing polymers, and a process of producing the porous bodies which comprises dissolving a nitrogen-containing polymer to form a gel, ionically crosslinking the gel, and covalently further crosslinking the ionically crosslinked gel body.
Inventors
- 👤 Tammy Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:53
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; C08B; C08B37/00; C08B37/0006; C08B37/0024; C08B37/0027; C08B37/003; C12; C12N; C12N11/00; C12N11/02; C12N11/10; C08J2201/00; C08J2201/04; C08J2201/054; C08J2201/0542; C08J2201/0543; C08J2201/0545; C08J2201/0546; C08J2305/00; C08J2305/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
98 words
A crosslinked porous body comprising a nitrogen-containing polymer crosslinked with an anionic salt solution and further crosslinked with a covalent-crosslinking agent selected from the group consisting of dialdehydes, aromatic dihalides, formaldehyde, epichlorohydrin, imididates, disulfonyl chlorides, diacid halides, aliphatic dihalides, bisepoxides, diesters, diazides, carbodiimides, aromatic and aliphatic diisocyanates, aromatic and aliphatic diisothiocyanates, aromatic bis-azido compounds, 1-fluoro-2-nitro-4-azidobenzene, p-azidophenacyl bromide, N-(azidonitrophenyl)-γ-aminobutyrate hydroxysuccinimide ester, genipin, butene-3,4-oxide, pentafluorobenzaldehyde, chlorobenzaldehyde, fluorobenzaldehyde, and mixtures thereof, wherein said porous body has an apparent bulk density of equal to or less than about 0.6 g/cm 3 and a surface area of at least 5 m 2 /g.
Claim 2
Dependent Claim
98 words
A crosslinked porous body comprising a nitrogen-containing polymer crosslinked with an anionic salt solution and further crosslinked with a covalent-crosslinking agent selected from the group consisting of dialdehydes, aromatic dihalides, formaldehyde, epichlorohydrin, imididates, disulfonyl chlorides, diacid halides, aliphatic dihalides, bisepoxides, diesters, diazides, carbodiimides, aromatic and aliphatic diisocyanates, aromatic and aliphatic diisothiocyanates, aromatic bis-azido compounds, 1-fluoro-2-nitro-4-azidobenzene, p-azidophenacyl bromide, N-(azidonitrophenyl)-γ-aminobutyrate hydroxysuccinimide ester, genipin, butene-3,4-oxide, pentafluorobenzaldehyde, chlorobenzaldehyde, fluorobenzaldehyde, and mixtures thereof, wherein said porous body has an apparent bulk density of equal to or less than about 0.6 g/cm 3 and a surface area of at least 5 m 2 /g.
Claim 3
Dependent Claim
29 words
The crosslinked porous body of claim 1, wherein said nitrogen-containing polymer is selected from the group consisting of chitosan, poly(amino-styrene), poly(vinylpyridine), poly(diaminodiphenyl-methane), poly (aminoaniline), poly(ethylenimine), poly(vinylpyrrolidone) and mixtures thereof.
Claim 4
Dependent Claim
13 words
The crosslinked porous body of claim 1, wherein said nitrogen-containing polymer is chitosan.
Claim 5
Dependent Claim
35 words
The crosslinked porous body of claim 1, wherein said anionic salt is selected from the consisting of the ammonium, onium and metal salts of sulfate, phosphate, polyphosphate, tripolyphosphate, o-benzaldehyde sulfonate, pyrophosphate, trimetaphosphate and mixtures thereof.
Claim 6
Dependent Claim
31 words
The crosslinked porous body of claim 1, wherein said covalent-crosslinking agent is selected from the group consisting of glutaraldehyde, glyoxal, piperazine dicarboxaldehyde, succinic aidehyde, adipic aidehyde, maleic aidehyde, and mixtures thereof.
Claim 7
Dependent Claim
13 words
The crosslinked porous body of claim 1, wherein said covalent-crosslinking agent is glutaraldehyde.
Claim 8
Dependent Claim
46 words
A crosslinked porous body comprising chitosan crosslinked with a tripolyphosphate solution and further crosslinked with glutaraldehyde, wherein said porous body has an apparent bulk density of equal to or less than about 0.6 g/cm 3 and a surface area of at least 5 m 2 /g.
Claim 9
Dependent Claim
46 words
A crosslinked porous body comprising chitosan crosslinked with a tripolyphosphate solution and further crosslinked with glutaraldehyde, wherein said porous body has an apparent bulk density of equal to or less than about 0.6 g/cm 3 and a surface area of at least 5 m 2 /g.
References Cited (Backward Citations)
US4125708A
Cited
JPS5616532A
Cited
US4336070A
Cited
JPS5857401A
Cited
US4833237A
Cited
US4879340A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-11 | 1998-01-10 | 1998-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-11 | 2002-01-10 | 2002-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-11 | 2006-01-10 | 2006-07-12 | $7700.00 | Window Closed / Lapsed |