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US4746468A
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Method of preparing ceramic microspheres
Assignee: Mitsubishi Mining and Cement Co Ltd
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Filing: 1986-05-16
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Granted: 1988-05-24
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Expires: 2006-05-16
Abstract
Abstract A manufacturing method for ceramic microspheres including the steps of; forming a suspension of ceramic fine powders as a dispersed phase and water as a dispersion medium; dispersing the suspension as droplets in a high boiling point liquid which has substantially the same specific gravity as the suspension and which is immiscible with water and nonreactive with the ceramic fine powder to make spherical particles; and subjecting the resultant product to drying and calcination.
Inventors
- 👤 Yoshiharu Ozaki
- 👤 Mitsushi Wadasako
- 👤 Toshihiro Kasai
- 👤 Yoshinori Shinohara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:38
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/486; B; B01; B01J; B01J2/00; B01J2/02; B01J2/06; C04B35/10
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
70 words
A method for producing ceramic microspheres comprising in combination the steps of forming a mechanical suspension of a ceramic fine powder in water, dispersing said suspension in droplet form into a liquid medium which is immiscible with water, non-reactive with the fine powder, has substantially the specific gravity as the suspension, and has a boiling point higher than water, to form spherical particles and drying and calcining the resultant particles.
Claim 2
Independent Claim
70 words
A method for producing ceramic microspheres comprising in combination the steps of forming a mechanical suspension of a ceramic fine powder in water, dispersing said suspension in droplet form into a liquid medium which is immiscible with water, non-reactive with the fine powder, has substantially the specific gravity as the suspension, and has a boiling point higher than water, to form spherical particles and drying and calcining the resultant particles.
Claim 3
Dependent Claim
28 words
The method of claim 1 wherein the water is vaporized from the spherical particles by heating the liquid medium to a temperature from 70° C. to 80° C.
Claim 4
Dependent Claim
21 words
The method of claim 1 or 2 wherein the spherical particles are filtered from the liquid medium and washed with alcohol.
Claim 5
Dependent Claim
20 words
The method of claim 1 wherein the spherical particles are sintered at a temperature from 1,000° C. to 1300° C.
Claim 6
Dependent Claim
24 words
The method of claim 1 wherein the liquid medium is a mixture of ethyl phthalate and n-butyl phthalate, or ethyl phthalate and dioctyl phthalate.
Claim 7
Dependent Claim
16 words
The method of claim 1 wherein the suspension is dispersed in droplet form through an orifice.
Claim 8
Dependent Claim
21 words
The method of claim 6 wherein the diameter of the orifice is in the range from 0.3 mm to 1.10 mm.
Claim 9
Dependent Claim
22 words
The method of claim 1 wherein dispersing the droplets is carried out at a temperature ranging from 0° C. to 30° C.
Claim 10
Dependent Claim
15 words
The method of claim 1 wherein a surface active agent is added to the suspension.
Claim 11
Dependent Claim
16 words
The method of claim 1 or 9 wherein an organic binder is added to the suspension.
Claim 12
Dependent Claim
13 words
The method of claim 10 wherein the organic binder is a water-soluble binder.
Claim 13
Dependent Claim
28 words
The method of claim 10 wherein the amount of organic binder is in the range from 10 to 30% by weight based on the solids in the suspension.
Claim 14
Independent Claim
78 words
A method for the preparation of ceramic microspheres comprising in combination the steps of hydrolyzing metal alkoxide to produce a ceramic fine powder, forming a suspension thereof in water, dispersing the mechanical suspension in droplet form into a liquid medium which is immiscible in water, non-reactive with the fine powder, has substantially the same specific gravity as the suspension and has a boiling point higher than water to form spherical particles, and drying and calcining the resultant particles.
Claim 15
Independent Claim
78 words
A method for the preparation of ceramic microspheres comprising in combination the steps of hydrolyzing metal alkoxide to produce a ceramic fine powder, forming a suspension thereof in water, dispersing the mechanical suspension in droplet form into a liquid medium which is immiscible in water, non-reactive with the fine powder, has substantially the same specific gravity as the suspension and has a boiling point higher than water to form spherical particles, and drying and calcining the resultant particles.
Claim 16
Dependent Claim
28 words
The method of claim 13 wherein the water is vaporized from the spherical particles by heating the liquid medium to a temperature from 70° C. to 80° C.
Claim 17
Dependent Claim
19 words
The method of claim 13 wherein the spherical particles are filtered from the liquid medium and washed with alcohol.
Claim 18
Dependent Claim
22 words
The method of claim 13 or 15 wherein the spherical particles are sintered at a temperature from 1,000° C. to 1300° C.
Claim 19
Dependent Claim
24 words
The method of claim 13 wherein the liquid medium is a mixture of ethyl phthalate and n-butyl phthalate, or ethyl phthalate and dioctyl phthalate.
Claim 20
Dependent Claim
16 words
The method of claim 13 wherein the suspension is dispersed in droplet form through an orifice.
Claim 21
Dependent Claim
21 words
The method of claim 18 wherein the diameter of the orifice is in the range from 0.3 mm to 1.10 mm.
Claim 22
Dependent Claim
22 words
The method of claim 13 wherein dispersing the droplets is carried out at a temperature ranging from 0° C. to 30° C.
Claim 23
Dependent Claim
15 words
The method of claim 13 wherein a surface active agent is added to the suspension.
Claim 24
Dependent Claim
16 words
The method of claim 13 or 21 wherein an organic binder is added to the suspension.
Claim 25
Dependent Claim
13 words
The method of claim 22 wherein the organic binder is a water-soluble binder.
Claim 26
Dependent Claim
28 words
The method of claim 22 wherein the amount of organic binder is in the range from 10 to 30% by weight based on the solids in the suspension.
Claim 27
Dependent Claim
13 words
The method of claim 13 wherein the suspension is treated with ultrasonic waves.
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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) | 1991-05-24 | 1991-11-23 | 1992-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-24 | 1995-11-23 | 1996-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-24 | 1999-11-23 | 2000-05-24 | $7700.00 | Window Closed / Lapsed |