US4849140A
Expired / Lapsed
US
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Method for producing monosized ceramic particle through organometallic swollen latex particles
Assignee: Southwest Research Institute
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Filing: 1987-08-05
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Granted: 1989-07-18
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Expires: 2007-08-05
Abstract
Abstract Monosized ceramic particles produced through synergistic combination of monosized latex particles and organometallic reagents in a solvent system. By swelling a poly(vinyltoluene) or other monosized latex with an appropriate organometallic reagent, decomposing the organometallic to ceramic within the latex vehicle, and then removing the latex polymer through thermolysis, monosized ceramic particles are produced. The swelling of the monosized latex particles with the organometallic reagent requires the judicious selection of a solvent system specific to the latex polymer and organic being employed.
Inventors
- 👤 Stephen T. Wellinghoff
- 👤 Stuart T. Schwab
- 👤 Carlos D. Herrera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:36
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; C04B35/63408; C04B35/6325; C04B35/63444
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
100 words
A method for producing ceramic particles comprising the steps of: a. suspending polymer latex particles in a dilute solution of a first polymeric surfactant in a first highly polar solvent; b. adding to said latex suspension an emulsified organometallic ceramic precursor in a dilute solution of a second polymeric surfactant in a second highly polar solvent; c. mixing said latex-organometallic suspension such that said organometallic ceramic precursor is impregnated into said latex particle; d. adding sufficient water to said latex-organometallic suspension to produce metallic oxide particles in solution; e. removing said latex from said metallic oxide particle solution by thermolysis.
Claim 2
Independent Claim
100 words
A method for producing ceramic particles comprising the steps of: a. suspending polymer latex particles in a dilute solution of a first polymeric surfactant in a first highly polar solvent; b. adding to said latex suspension an emulsified organometallic ceramic precursor in a dilute solution of a second polymeric surfactant in a second highly polar solvent; c. mixing said latex-organometallic suspension such that said organometallic ceramic precursor is impregnated into said latex particle; d. adding sufficient water to said latex-organometallic suspension to produce metallic oxide particles in solution; e. removing said latex from said metallic oxide particle solution by thermolysis.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein said latex particles are poly(vinyltoluene).
Claim 4
Dependent Claim
12 words
The method of claim 2 wherein said organometallic presursor is tantalum ethoxide.
Claim 5
Independent Claim
108 words
A method of producing ceramic particles comprising the steps of: a. suspending poly(vinyltoluene) particles in a 0.01% poly(vinyl-N-pyrrolidone solution in dimethylsulfoxide; b. adding to said poly(vinyltoluene) suspension sufficient quantity of emulsified 10% tantalum ethoxide in a 0.05% poly(vinyl-N-pyrrolidone solution in dimethoylsulfoxide such that an approximate ten fold excess of tantalum ethoxide is present; c. mixing and ultrasonicating said poly(vinyltoluene)tantalum ethoxide suspension for approximately 12 hours at 50°C. such that a portion of said tantalum ethoxide is impregnated into said poly(vinyltoluene) particles; d. adding sufficient water to said poly(vinyltoluene)tantalum ethoxide suspension to oxidize said tantalum ethoxide to tantalum oxide; e. removing said poly(vinyltoluene) from said tantalum oxide by thermolysis.
Claim 6
Independent Claim
108 words
A method of producing ceramic particles comprising the steps of: a. suspending poly(vinyltoluene) particles in a 0.01% poly(vinyl-N-pyrrolidone solution in dimethylsulfoxide; b. adding to said poly(vinyltoluene) suspension sufficient quantity of emulsified 10% tantalum ethoxide in a 0.05% poly(vinyl-N-pyrrolidone solution in dimethoylsulfoxide such that an approximate ten fold excess of tantalum ethoxide is present; c. mixing and ultrasonicating said poly(vinyltoluene)tantalum ethoxide suspension for approximately 12 hours at 50°C. such that a portion of said tantalum ethoxide is impregnated into said poly(vinyltoluene) particles; d. adding sufficient water to said poly(vinyltoluene)tantalum ethoxide suspension to oxidize said tantalum ethoxide to tantalum oxide; e. removing said poly(vinyltoluene) from said tantalum oxide by thermolysis.
Claim 7
Dependent Claim
37 words
The method of claim 1 wherein said first polymeric surfactant is of the same composition as said second polymeric surfactant and said first highly polar solvent is of the same composition as said second highly polar solvent.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-07-17 | 1993-01-16 | 1993-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-17 | 1997-01-16 | 1997-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-17 | 2001-01-16 | 2001-07-18 | $7700.00 | Window Closed / Lapsed |