Surface modified hollow microspheres
US4340642A · kind A · utility
33Cited by
4References
5Claims
0Family size
Assignee
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Key dates
| Filing date | Jun 20, 1980 |
| Grant date | Jul 20, 1982 |
| Priority date | — |
| Expiry date | Jun 20, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2996
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Non-fused hollow glass microspheres that consist primarily of silicate are rendered more water-resistant by treatment with multivalent metals. The hollow microspheres are slurried with water and then a solution of a multivalent metal salt such as Al.sub.2 (SO.sub.4).sub.3 is added to the slurry. The rate of the addition is controlled so that the pH can be regulated. Separating, washing and drying complete the preparation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.