Water resistance of fine-vermiculite articles
US4915871A · kind A · utility
7Cited by
3References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 13, 1989 |
| Grant date | Apr 10, 1990 |
| Priority date | — |
| Expiry date | Apr 13, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B41/52
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Certain articles required to function in air at temperatures of 250.degree. C. or higher comprise very fine particles of vermiculite from which the interstitial magnesium ions have been at least partially removed and which has been swollen in water. These articles are not ordinarily exposed to water when in use, but if they are they are likely to disintegrate quickly because of the ready dispersibility of the vermiculite particles. By the invention, water-resistance is given to such articles by treating them with a solution of an aluminate salt e.g. NaAlO.sub.2 or a zirconyl salt e.g. ZrOCl.sub.2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.