EP0448302A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Carbon-clad inorganic oxide particles and the same with a polymer coating thereon
Assignee: University of Minnesota Twin Cities
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Filing: 1991-03-15
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Granted: —
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Expires: 2011-03-15
Abstract
Abstract A porous zirconium oxide particle having a surface which is substantially covered by a carbon cladding. A carbon-clad zirconium or other inorganic oxide particle may have an outermost cross-linked polymer coating. Carbon-clad inorganic oxide particles may be formed by placing a plurality of the particles in a reaction chamber, elevating the temperature within the chamber, reducing the pressure within the chamber, and introducing into the chamber a vapor comprising carbon and thermally decomposing the vapor so as to deposit a cladding of carbon onto the particles. The carbon-clad particles may be coated with a monomer or an oligomer followed by cross-linking the monomer or oligomer to provide polymer-coated carbon-clad inorganic oxide particles.
Inventors
- 👤 Eric F. C/O Minnesota Mining And Funkenbusch
- 👤 Peter W. Carr
- 👤 Douglas A. C/O Minn.Min.And Manuf.Co. Hanggi
- 👤 Thomas P. Weber
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 18:33
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/06; B01J20/04; B01J20/041; B01J20/08; B01J20/10; B01J20/103; B01J20/20; B01J20/28; B01J20/28002; B01J20/28004; B01J20/28014; B01J20/28016; B01J20/28019; B01J20/28054; B01J20/28057; B01J20/28069; B01J20/28078; B01J20/28083; B01J20/28085; B01J20/281; B01J20/286; B01J20/30; B01J20/3078; B01J20/3092; B01J20/32; B01J20/3202; B01J20/3204; B01J20/3231; B01J20/3234; B01J20/324; B01J20/3242; B01J20/3268; B01J20/327; B01J20/3272; B01J20/3274; B01J20/328; B01J20/3282; B01J20/3289; B01J20/3291; B01J20/3293; B01J2220/00; B01J2220/50; B01J2220/54; B01J2220/58; B01J2220/80; B01J2220/82; B01J2220/825
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
16 words
A porous zirconium oxide particle having a surface which is substantially covered by a carbon cladding.
Claim 2
Dependent Claim
43 words
The carbon-clad zirconium oxide particle of claim 1 which is substantially spherical in shape and which comprises a zirconium oxide core having a diameter of about 1-500 microns, a surface area of about 5-300 m²/g, and a pore size of about 20-5000 Å.
Claim 3
Dependent Claim
23 words
The carbon-clad zirconium oxide particle of claim 1, wherein at least about 75% of the porous surface is covered by the carbon cladding.
Claim 4
Dependent Claim
11 words
A carbon-clad inorganic oxide particle having an outermost cross-linked polymer coating.
Claim 5
Dependent Claim
30 words
The particle of claim 4 which has a diameter of about 2-1000 microns, a surface area of about 2-80 m²/g, and a pore size of about 50 - 1000 Å.
Claim 6
Dependent Claim
30 words
The particle of claim 4 wherein the polymer coating is selected from the group consisting of polybutadiene, polyvinylalcohol, poly(ethylene glycol), polyvinylpyrollidone, polyethyleneimine, poly(butadiene maleic acid), polysiloxane, and poly-ℓ-histidine, and dextran.
Claim 7
Independent Claim
105 words
A method for forming carbon-clad inorganic oxide particles comprising the steps of: (a) placing a plurality of porous inorganic oxide particles having a surface, a diameter of about 1 - 500 microns, a surface area of about 5-300 m²/g, and a pore diameter of about 20 - 5000 Å within a reaction chamber; (b) elevating the temperature within the reaction chamber and reducing the pressure within the reaction chamber; and (c) introducing a vapor comprising carbon into the reaction chamber so as to thermally decompose the vapor and deposit a cladding of said carbon onto the porous particles, substantially covering the surface of the particles.
Claim 8
Dependent Claim
28 words
The method of claim 7, wherein the deposition is carried out for about 1 - 240 minutes and the pressure is reduced to less than about 60 Torr.
Claim 9
Dependent Claim
17 words
The method of claim 7, wherein the inorganic oxide is ZrO₂, HfO₂, Al₂O₃, TiO₂, MgO, or SiO₂.
Claim 10
Dependent Claim
38 words
The method of claim 7, further comprising a step of: (d) exposing the particles of said step (c) to a gaseous reducing mixture so as to cause reduction of polar functional groups on the surface of the particles.
Claim 11
Dependent Claim
28 words
The method of claim 7, further comprising agitating the particles during said step (c) so as to increase the uniformity of the carbon cladding deposited onto the particles.
Claim 12
Independent Claim
65 words
A method for forming a support material useful as a stationary phase in liquid chromatography, comprising the steps of: (a) providing a plurality of inorganic oxide particles comprising a surface which is substantially covered by a carbon cladding; (b) coating the carbon-clad particles with a monomer or oligomer; and (c) cross-linking the monomer or oligomer to form a plurality of polymer-coated carbon-clad inorganic oxide particles.
Claim 13
Dependent Claim
39 words
The method of claim 12, further comprising, prior to said step (b), a step of exposing the carbon-clad particles to a gaseous reducing mixture so as to cause reduction of polar oxygenated sites on the surface of the particles.
References Cited (Backward Citations)
No citation records indexed.
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