US4775655A
Expired / Lapsed
US
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Porous carbon structures and methods for their preparation
Assignee: Unilever Patent Holdings BV
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Filing: 1986-11-17
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Granted: 1988-10-04
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Expires: 2006-11-17
Abstract
Abstract This invention relates to the production of a novel, porous, carbon structure. A stabilised porous polymer comprising cavities joined by interconnecting pores is heated in an inert atmosphere to yield a stable, porous, carbon structure having the inherent structure of the original stabilised polymer.
Inventors
- 👤 Christopher J. C. Edwards
- 👤 David A. Hitchen
- 👤 Martin Sharples
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:02
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/524; C04B38/00; C04B38/0022
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
64 words
A porous carboniferous structure consisting of concave surfaces and having at least 80% voids and comprising cavities joined by interconnecting pores and having a density of less than 0.5 g/cm 3 , the carboniferous structure being derived from a porous cross-linked polymer formed by polymerising monomer and cross-linking agent as a continous phase of a high internal phase emulsion having an aqueous discontinuous phase.
Claim 2
Dependent Claim
64 words
A porous carboniferous structure consisting of concave surfaces and having at least 80% voids and comprising cavities joined by interconnecting pores and having a density of less than 0.5 g/cm 3 , the carboniferous structure being derived from a porous cross-linked polymer formed by polymerising monomer and cross-linking agent as a continous phase of a high internal phase emulsion having an aqueous discontinuous phase.
Claim 3
Dependent Claim
24 words
A porous carboniferous structure as claimed in claim 1 having at least 90% voids and a density of less than 0.25 g/cm 3 .
Claim 4
Dependent Claim
56 words
A process for the manufacture of a porous carbon structure comprising heating a stabilised, cross-linked, porous polymer in an inert atmosphere to a temperature of at least 500° C., the cross-linked porous polymer being formed by polymerising monomer and cross-linking agent as a continuous phase of a high internal phase emulsion having an aqueous discontinous phase.
Claim 5
Dependent Claim
56 words
A process for the manufacture of a porous carbon structure comprising heating a stabilised, cross-linked, porous polymer in an inert atmosphere to a temperature of at least 500° C., the cross-linked porous polymer being formed by polymerising monomer and cross-linking agent as a continuous phase of a high internal phase emulsion having an aqueous discontinous phase.
Claim 6
Dependent Claim
16 words
A process as claimed in claim 3 in which the porous polymer is a sulphonated polystyrene.
Claim 7
Dependent Claim
25 words
A process as claimed in claim 4 in which at least 20% of the polymer is cross-linked and 50% of the cross-linked polymer is sulphonated.
Claim 8
Dependent Claim
16 words
A process as claimed in claim 3 in which the cross-linked polymer is an alkyl acrylonitrile.
Claim 9
Dependent Claim
15 words
A process as claimed in claim 3 in which the cross-linked polymer is a polychlorostyrene.
Claim 10
Dependent Claim
17 words
A process as claimed in claim 7 in which the degree of cross-linking is greater than 20%.
Claim 11
Dependent Claim
40 words
A process as claimed in claim 3 in which the porous polymer is a flexible polymer and is modified by the incorporation of a resin to coat the interior surfaces of the polymer, prior to heating to carbonise the polymer.
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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) | 1991-10-04 | 1992-04-04 | 1992-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-04 | 1996-04-04 | 1996-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-04 | 2000-04-04 | 2000-10-04 | $7700.00 | Window Closed / Lapsed |