IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0465848
(2006-08-21)
|
등록번호 |
US-8701441
(2014-04-22)
|
발명자
/ 주소 |
- Kramlich, David C.
- Vandenberg, John L.
- Frey, Matthew H.
- Culler, Scott R.
- Schakel-Carlson, Kathleen M.
|
출원인 / 주소 |
- 3M Innovative Properties Company
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
41 |
초록
▼
A process for making inorganic, metal oxide spheres that includes exposing solidified, molded microparticles that include a glass precursor composition to a temperature sufficient to transform the molded microparticles into molten glass and cooling the molten glass to form inorganic, metal oxide sph
A process for making inorganic, metal oxide spheres that includes exposing solidified, molded microparticles that include a glass precursor composition to a temperature sufficient to transform the molded microparticles into molten glass and cooling the molten glass to form inorganic, metal oxide spheres.
대표청구항
▼
1. A process for making inorganic, metal oxide spheres, the process comprising: forming a glass precursor composition comprising glass precursor particles dispersed in a vehicle such that the composition forms a dispersion, the vehicle including at least one of water, an organic liquid, and a binder
1. A process for making inorganic, metal oxide spheres, the process comprising: forming a glass precursor composition comprising glass precursor particles dispersed in a vehicle such that the composition forms a dispersion, the vehicle including at least one of water, an organic liquid, and a binder;filling a plurality of mold cavities with the glass precursor composition;solidifying the glass precursor composition in the mold cavities to form solidified, molded microparticles;demolding the solidified, molded microparticles from the plurality of mold cavities, the molded microparticles each having a volume of no greater than 8,000,000,000 μm3;exposing the solidified, molded microparticles, after demolding, to a temperature sufficient to transform the molded microparticles into homogeneous molten glass; andcooling the homogeneous molten glass to form inorganic, metal oxide spheres. 2. The process of claim 1, wherein the inorganic metal oxide spheres comprise glass. 3. The process of claim 1, wherein the molded microparticles comprise binder and particulate. 4. The process of claim 3, wherein the binder comprises at least one of cellulose, polymer, and actinic radiation curable resin. 5. The process of claim 1, wherein the exposing comprises: passing the molded microparticles through a chamber having a temperature sufficient to melt the solidified, molded microparticles;melting the molded microparticles; andrendering the melted particles substantially spherical. 6. The process of claim 1, further comprising maintaining the homogeneous molten glass at or above the transforming temperature for a sufficient period of time such that the homogeneous molten glass forms into spherical molten droplets. 7. The process of claim 1, wherein the exposing comprises exposing the molded microparticles to a temperature of at least 2000 K. 8. The process of claim 1, wherein the demolding comprises exposing the molded microparticles to at least one of emissions from a sonic horn and sonic energy. 9. The process of claim 1, wherein solidifying the glass precursor composition includesexposing the composition to an energy source to at least partially solidify the composition. 10. The process of claim 1, wherein the vehicle comprises a binder comprising at least one of cellulose, thermoplastic polymer, and actinic radiation curable resin. 11. The process of claim 1, wherein each mold cavity defines a volume no greater than about 880,000,000 cubic micrometers. 12. The process of claim 1, wherein each mold cavity defines a shape comprising at least one of polyhedron, parallelpiped, cylinder, arcuate, arcuate terminated cylinder, hemisphere, gumdrop, bell, cone, and frusto-conical cone. 13. The process of claim 1, wherein the plurality of mold cavities is present on a three-dimensional body having at least one continuous surface comprising a plurality of openings at least some of which provide access to the mold cavities, the mold cavities extending into the three-dimensional body. 14. The process of claim 13, wherein the three-dimensional body comprises polymer, metal, ceramic or a combination thereof. 15. The process of claim 1, wherein the plurality of mold cavities is present on a belt, a web, a cylindrical coating roll, a sheet, a sleeve, or a combination thereof. 16. The process of claim 1, wherein the plurality of mold cavities further comprises a release agent. 17. The process of claim 1, wherein the glass precursor comprises particles comprising oxides of at least one of silicon, aluminum, zirconium, titanium, boron, lanthanum, sodium, potassium, calcium, magnesium, and barium. 18. The process of claim 1, wherein the inorganic, metal oxide spheres have an average cross-sectional dimension no greater than about 500 micrometers. 19. The process of claim 1, wherein the inorganic, metal oxide spheres have an average cross-sectional dimension no greater than 100 micrometers. 20. The process of claim 1, wherein the inorganic, metal oxide spheres have an average cross-sectional dimension no greater than 60 micrometers. 21. The process of claim 1, wherein the molded microparticles exhibit a shape comprising at least one of polyhedron, parallelpiped, diamond, cylinder, arcuate, arcuate terminated cylinder, sphere, hemisphere, gumdrop, bell, cone, and frusto-conical cone. 22. The process of claim 1, wherein the inorganic, metal oxide spheres are hollow, transparent or a combination thereof 23. The process of claim 1, wherein the resulting spheres formed by the process have a mean sphere diameter, and wherein the resulting spheres exhibit an average absolute deviation from the mean sphere diameter of less than 20% prior to a screening step. 24. The process of claim 1, wherein the resulting spheres formed by the process have a mean sphere diameter, and wherein the resulting spheres exhibit an average absolute deviation from the mean sphere diameter of less than 10% prior to a screening step. 25. The process of claim 1, wherein the resulting spheres formed by the process have an index of refraction of at least about 1.2. 26. A process for making glass microspheres, the process comprising: forming a glass precursor composition comprising glass precursor particles dispersed in a vehicle such that the composition forms a dispersion, the vehicle including at least one of water, an organic liquid, and a binder;filling a plurality of mold cavities with the glass precursor composition;solidifying the glass precursor composition in the mold cavities to form solidified, molded microparticles;demolding the solidified, molded microparticles from the plurality of mold cavities, the molded microparticles each having a volume of no greater than 8,000,000,000 μm3;exposing the solidified, molded microparticles, after demolding, to a temperature sufficient to transform the molded microparticles into homogeneous molten glass droplets;maintaining the homogeneous molten glass droplets at or above the transforming temperature for a sufficient period of time such that the droplets form into spheres; andcooling the homogeneous molten glass droplets to form glass microspheres. 27. The process of claim 26, wherein the glass microspheres comprise microbubbles. 28. The process of claim 26, wherein the glass microspheres comprise microbeads. 29. The process of claim 1, wherein the plurality of mold cavities is formed in a production tool, and wherein the production tool is formed of a polyolefin, a polyamide, a polyimide, a metal, a ceramic, or a combination thereof. 30. The process of claim 1, wherein the vehicle is present in the glass precursor composition in an amount of from about 20% by weight. 31. The process of claim 1, wherein each mold cavity has a volume V according to the following equation: V=4/3(π)(D/2)3÷(% solids)÷(% densification)where D is the desired diameter of the inorganic, metal oxide spheres, % solids refers to the % solids present in the glass precursor composition, and % densification is the amount of volume shrinkage expected from the glass precursor composition.
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