Manufacturing process for hollow microspheres
US4420442A · kind A · utility
134Cited by
7References
6Claims
0Family size
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Inventor
Key dates
| Filing date | Sep 21, 1982 |
| Grant date | Dec 13, 1983 |
| Priority date | — |
| Expiry date | Sep 21, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2982
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
More perfect, less porous hollow microspheres can be prepared by spray-drying dispersions of film-forming solids that contain certain organic solvents. The organic solvents are water-miscible and have boiling points of 100.degree. C. or more. The solvent is added just prior to spray drying and the resulting product has fewer cracks and/or holes. This improvement is especially beneficial to preparation systems involving alkali metal silicates and "polysalts."
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.