Claims
- 1. In a process for forming hollow microspheres from glass particles whose dimensions are less than 50 micrometers by grinding the glass particles, suspending these particles in a gas current, passing said suspended particles through burner means and recovering the formed micropheres, the improvement which comprises mixing a fluidizing agent with the glass particles prior to passing said particles through the burner means, said fluidizing comprising an organic compound having a first part which exhibits an affinity for glass and a second part which promotes the independence of the particles, said organic compound added in an amount sufficient to reduce the forces of attraction of the particles but less than that which would reduce the fluidity of the mixture.
- 2. The process of claim 1 wherein the fluidizing agent organic compound comprises a polar part exhibiting an affinity for glass and nonpolar part.
- 3. The process of claim 2, wherein the polar part comprises amino and/or hydroxyl groups.
- 4. The process of claim 3, wherein the fluidizing agent is an alkanolamine or alkylene glycol.
- 5. The process of claim 1 wherein the fluidizing agent is mixed with glass particles in proportions not exceeding 0.5% by weight.
- 6. The process of claim 1, wherein at least 90% by weight of the treated glass particles have a granulometry of less than about 35 micrometers.
- 7. The process of claim 6, wherein at least 90% by weight of the particles have a granulometry of less than about 20 micrometers.
- 8. The process of claim 1, wherein the fluidizing agent is introduced during the grinding of the glass particles.
- 9. ln a process for forming hollow microspheres from glass particles whose dimensions are less than 50 micrometers by grinding the glass particles, suspending these particles in a gas current, passing said suspended particles through burner means and recovering the formed microspheres, the improvement which comprises mixing a fluidizing agent of an organic compound with the glass particles prior to passing said particles through the burner means, said fluidizing agent organic compound comprising a polar part exhibiting an affinity for glass and a nonpolar part and added in an amount sufficient to reduce the forces of attraction of the particles but less than that which would reduce the fluidity of the mixture.
- 10. The process of claim 9, wherein the polar part comprises amino and/or hydroxyl groups.
- 11. The process of claim 9, wherein the fluidizing agent is an alkanolamine or alkylene glycol.
- 12. The process of claim 9, wherein fluidizing agent is mixed with glass particles in proportions not exceeding 0.5% by weight.
- 13. The process of claim 9, wherein at least 90% by weight of the treated glass particles have a granulometry of less than about 35 micrometers.
- 14. The process of claim 9, wherein at least 90% by weight of the particles have a granulometry of less than about 20 micrometers.
- 15. The process of claim 9, wherein the fluidizing agent is introduced during the grinding of the glass particles.
- 16. In a process for forming hollow microspheres from glass particles whose dimensions are less than 50 micrometers by grinding the glass particles, suspending these particles in gas current, passing said suspended particles through burner means and recovering the formed microspheres, the improvement which comprises mixing a fluidizing agent with the glass particles prior to passing said particles through the burner means, said fluidizing agent comprising an organic compound having a polar part exhibiting an affinity for glass and a nonpolar part, wherein the polar part comprises amino and/or hydroxyl groups, said organic compound added in an amount sufficient to reduce the forces of attraction of the particles but less than that which would reduce the fluidity of the mixture.
- 17. The process of claim 16 wherein the fluidizing agent is an alkanolamine or alkylene glycol.
- 18. The process of claim 17, wherein fluidizing agent is mixed with glass particles in proportions not exceeding 0.5% by weight.
- 19. The proeess of claim 18, wherein at least 90% by weight of the treated glass particles have a granulometry of less than about 35 micrometers.
- 20. The process of claim 19, wherein at least 90% by weight of the particles have a granulometry of less than about 20 micrometers.
- 21. The process of claim 20, wherein the fluidizing agent is introduced during the grinding of the glass particles.
- 22. The process of claim 1 wherein said hollow microspheres are formed with a distribution average corresponding to dimensions that are not greater than 20 micrometers.
- 23. The process of claim 1 wherein said hollow microspheres are formed with distribution average corresponding to dimensions that are not greater than 10 micrometers.
- 24. The process of claim 1 wherein said hollow microspheres are formed with a real density of greater than 0.4 g/cc.
- 25. The process of claim 1 wherein said hollow microspheres are formed with a density of less than 2.2 g/cc.
- 26. The process of claim 1 wherein said hollow microspheres are formed with a density of less than 1.2 g/cc.
- 27. The process of claim 9 wherein said hollow microspheres are formed with a distribution average corresponding to dimensions that are not greater than 20 micrometers.
- 28. The process of claim 9 wherein said hollow microspheres are formed with a distribution average corresponding to dimensions that are not greater than 10 micrometers.
- 29. The process of claim 9 wherein said hollow microspheres are formed with a real density of greater than 0.4 g/cc.
- 30. The process of claim 9 wherein said hollow microspheres are formed with a density of less than 2.2 g/cc.
- 31. The process of claim 9 wherein said hollow microspheres are formed with a density of less than 1.2 g/cc.
- 32. The process of claim 16 wherein said hollow microspheres are formed with a distribution average corresponding to dimensions that are not greater than 20 micrometers.
- 33. The process of claim 16 wherein said hollow microspheres are formed with a distribution average corresponding to dimensions that are not greater than 10 micrometers.
- 34. The process of claim 16 wherein said hollow microspheres are formed with a real density of greater than 0.4 g/cc.
- 35. The process of claim 16 wherein said hollow microspheres are formed with a density of less than 2.2 g/cc.
- 36. The process of claim 16 wherein said hollow microspheres are formed with a density of less than 1.2 g/cc.
Priority Claims (2)
Number |
Date |
Country |
Kind |
84 09736 |
Jun 1984 |
FRX |
|
86 02921 |
Mar 1986 |
FRX |
|
CROSS REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of application Ser. No. 747,141, filed June 20, 1985, now U.S. Pat. No. 4,661,137, granted Apr. 28, 1987.
US Referenced Citations (8)
Foreign Referenced Citations (5)
Number |
Date |
Country |
2249585 |
May 1975 |
FRX |
2318123 |
Feb 1977 |
FRX |
2524610 |
Nov 1983 |
FRX |
2529879 |
Jan 1984 |
FRX |
960902 |
Jun 1984 |
GBX |
Non-Patent Literature Citations (2)
Entry |
Chopinet et al., Factors Determining the Residual Sulfate Content of Glass; Glasstechniche Berichte, vol. 56, pp. 596-601 (1983). |
Glass Microbaloon Particles for Construction Materials Alford Ceramic Age, Apr. 1962, pp. 55, 56, & 58. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
747141 |
Jun 1985 |
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