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US5182016A
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Polymer-coated carbon-clad inorganic oxide particles
Assignee: University of Minnesota System
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Filing: 1991-09-18
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Granted: 1993-01-26
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Expires: 2011-09-18
Abstract
Abstract Polymer-coated carbon-clad inorganic oxide particles are disclosed which are useful in sorbent applications, particularly as packing materials for High Performance Liquid Chromatography (HPLC). A method for the preparation of a chromatographic support material is also disclosed which comprises coating carbon-clad inorganic oxide particles with a monomer or oligomer and cross-linking the monomer or oligomer.
Inventors
- 👤 Eric F. Funkenbusch
- 👤 Peter W. Carr
- 👤 Douglas A. Hahggi
- 👤 Thomas P. Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:41
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/30; B01J20/32; B01J20/3202; B01J20/3204; B01J20/02; B01J20/06; B01J20/281; B01J20/286; B01J20/3231; B01J20/3234; B01J20/324; B01J20/3242; B01J20/3268; B01J20/327; B01J20/3272; B01J20/3274; B01J20/328; B01J20/3282; B01J20/3289
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
37 words
A particle comprising an inorganic oxide core, a carbon cladding on said core, and a cross-linked polymer coating on said carbon cladding, wherein said inorganic oxide core has a diameter of about 1μ to about 1 cm.
Claim 2
Dependent Claim
37 words
A particle comprising an inorganic oxide core, a carbon cladding on said core, and a cross-linked polymer coating on said carbon cladding, wherein said inorganic oxide core has a diameter of about 1μ to about 1 cm.
Claim 3
Dependent Claim
9 words
The particle of claim 1 which is a spherule.
Claim 4
Dependent Claim
14 words
The spherule of claim 2 wherein the polymer coating comprises a hydrophobic polymer coating.
Claim 5
Dependent Claim
12 words
The spherule of claim 3 wherein the hydrophobic polymer coating comprises polybutadiene.
Claim 6
Dependent Claim
14 words
The spherule of claim 2, wherein the polymer coating comprises a hydrophilic polymer coating.
Claim 7
Dependent Claim
33 words
The spherule of claim 5 wherein the hydrophilic polymer coating comprises a hydrophilic polymer selected from the group consisting of polyvinylalcohol, poly(ethylene glycol), polyvinylpyrollidone, polyethyleneimine, poly(butadiene maleic acid), polysiloxane, and poly-l-histidine, and dextran.
Claim 8
Dependent Claim
13 words
The particle of claim 1 which has a diameter of about 2-1000 microns.
Claim 9
Dependent Claim
16 words
The particle of claim 1 which has a surface area of about 2-80 m 2 /g.
Claim 10
Dependent Claim
17 words
The particle of claim 1 which is porous and has a pore size of about 50-1000 Å.
Claim 11
Dependent Claim
24 words
The particle of claim 1 wherein said inorganic oxide is selected from a group consisting of Group II, Group III and Group IV metals.
Claim 12
Dependent Claim
35 words
The particle of claim 10 wherein said inorganic oxide is selected from the group consisting of HfO 2 , ZrO 2 , SiO 2 , Al 2 O 3 , TiO 2 , and MgO.
Claim 13
Dependent Claim
13 words
The particle of claim 11 wherein said inorganic oxide is ZrO 2 .
Claim 14
Dependent Claim
20 words
The particle of claim 12 wherein said ZrO 2 core has a surface area of about 5-300 m 2 /g.
Claim 15
Dependent Claim
20 words
The particle of claim 13 wherein said ZrO 2 core has a surface area of about 15-100 m 2 /g.
Claim 16
Dependent Claim
21 words
The particle of claim 12 wherein said ZrO 2 core is porous and has a pore size of about 20-5,000 Å.
Claim 17
Dependent Claim
18 words
The particle of claim 15 wherein said ZrO 2 core has a pore size of about 60-1,000 Å.
Claim 18
Dependent Claim
16 words
The particle of claim 12 wherein said ZrO 2 core has a diameter of about 1-500μ.
Claim 19
Dependent Claim
16 words
The particle of claim 17 wherein said ZrO 2 core has a diameter of about 2-50μ.
Claim 20
Dependent Claim
21 words
The particle of claim 12 wherein said carbon-clad ZrO 2 core has a surface area of about 5-300 m 2 /g.
Claim 21
Dependent Claim
21 words
The particle of claim 19 wherein said carbon-clad ZrO 2 core has a surface area of about 15-100 m 2 /g.
Claim 22
Dependent Claim
22 words
The particle of claim 12 wherein said carbon-clad ZrO 2 core is porous and has a pore size of about 20-5,000 Å.
Claim 23
Dependent Claim
19 words
The particle of claim 21 wherein said carbon-clad ZrO 2 core has a pore size of about 60-1,000 Å.
Claim 24
Dependent Claim
17 words
The particle of claim 12 wherein said carbon-clad ZrO 2 core has a diameter of about 1-500μ.
Claim 25
Dependent Claim
17 words
The particle of claim 23 wherein said carbon-clad ZrO 2 core has a diameter of about 2-50μ.
Claim 26
Dependent Claim
19 words
The particle of claim 1 wherein said carbon cladding has a thickness which does not exceed about 20 Å.
Claim 27
Dependent Claim
26 words
A packing material useful as a stationary phase in a liquid chromatography column, comprising a plurality of the polymer-coated carbon-clad inorganic oxide particles of claim 1.
Claim 28
Dependent Claim
24 words
A particle comprising an essentially non-porous inorganic oxide core, a carbon cladding on said core, and a crosslinked polymer coating on said carbon cladding.
Claim 29
Dependent Claim
24 words
A particle comprising an essentially non-porous inorganic oxide core, a carbon cladding on said core, and a crosslinked polymer coating on said carbon cladding.
Claim 30
Dependent Claim
9 words
The particle of claim 1 which is a spherule.
Claim 31
Dependent Claim
14 words
The particle of claim 1 wherein the inorganic oxide core is ZrO 2 .
Claim 32
Dependent Claim
17 words
A particle according to claim 1 wherein said inorganic oxide core has a diameter of about 0.4-7μ.
Claim 33
Dependent Claim
20 words
The particle of claim 1 wherein said inorganic oxide core has a surface area of about 0.1-3 m 2 /g.
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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) | 1996-01-26 | 1996-07-27 | 1997-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-01-26 | 2000-07-27 | 2001-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-01-26 | 2004-07-27 | 2005-01-26 | $7700.00 | Window Closed / Lapsed |