Patent US5037857A successfully refreshed from Google Patents.
US5037857A
Expired / Lapsed
US
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High-surface-area fiber
Assignee: Rohm and Haas Co
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Filing: 1989-08-28
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Granted: 1991-08-06
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Expires: 2009-08-28
Abstract
Abstract Polyaromatic fibers or microbeads which are swollen with solvent and crosslinked while swollen in such a way that the expanded, or macronet, structure of the swollen fiber or microbead is stabilized and retained even after drying exhibit high surface area and significant adsorptive capacity.
Inventors
- 👤 Stephen G. Maroldo
- 👤 Richard M. Kopchik
- 👤 Eric J. Langenmayr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:44
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/24; C08F; C08F8/00; C08J2325/00; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2967
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
20 words
A crosslinked polyaromatic polymer fiber having a macronet structure and a surface area of at least 100 m 2 /g.
Claim 2
Dependent Claim
20 words
A crosslinked polyaromatic polymer fiber having a macronet structure and a surface area of at least 100 m 2 /g.
Claim 3
Dependent Claim
33 words
The fiber of claim 1 wherein the polyaromatic polymer forms the matrix fiber of a heterogeneous polymer fiber, and wherein a plurality of fibers of polyolefin are imbedded longitudinally in the matrix fiber.
Claim 4
Dependent Claim
19 words
The fiber of claim 1 wherein the polyaromatic polymer is selected from the group consisting of poly(styrene) and poly(alpha-methylstyrene).
Claim 5
Dependent Claim
18 words
The fiber of claim 2 wherein the polyolefin is selected from the group consisting of polypropylene and polybutenes.
Claim 6
Dependent Claim
18 words
The fiber of claim 3 wherein the fiber possesses chemical functionality suitable for adsorptive, organic-reactive or ion-exchange phenomena.
Claim 7
Dependent Claim
11 words
The fiber of claim 5 wherein the functionality is ion-exchange functionality.
Claim 8
Dependent Claim
11 words
The fiber of claim 6 wherein the functionality is cation-exchange functionality.
Claim 9
Dependent Claim
12 words
The fiber of claim 7 wherein the functionality is sulfonic acid functionality.
Claim 10
Dependent Claim
67 words
A crosslinked polyaromatic polymer fiber having a macronet structure and a surface area of at least 100 m 2 /g, prepared by swelling the fiber in a swelling agent for the crosslinked polymer, which swelling agent is removable, does not deactivate Friedel-Crafts catalysts and does not interfere with the formation of a macronet structure, and subsequently introducing additional crosslinking into the polymer to stabilize its swollen structure.
Claim 11
Dependent Claim
67 words
A crosslinked polyaromatic polymer fiber having a macronet structure and a surface area of at least 100 m 2 /g, prepared by swelling the fiber in a swelling agent for the crosslinked polymer, which swelling agent is removable, does not deactivate Friedel-Crafts catalysts and does not interfere with the formation of a macronet structure, and subsequently introducing additional crosslinking into the polymer to stabilize its swollen structure.
Claim 12
Dependent Claim
17 words
The fiber of claim 9 wherein the swelling agent is removed subsequent to introducing the additional crosslinking.
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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) | 1994-08-05 | 1995-02-04 | 1995-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-05 | 1999-02-04 | 1999-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-05 | 2003-02-04 | 2003-08-06 | $7700.00 | Window Closed / Lapsed |