Zinc oxide and a process of making it
US5876688A · kind A · utility
21Cited by
7References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 6, 1996 |
| Grant date | Mar 2, 1999 |
| Priority date | — |
| Expiry date | Mar 6, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K3/22
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A process for preparing zinc oxide comprises introducing, into an atmosphere, an aqueous solution of a zinc salt that is thermally decomposable to zinc oxide, the atmosphere having a temperature sufficient to decompose the salt to the oxide, and recovering zinc oxide. The zinc oxide so-prepared is in the form of discrete particles which can have an average particle size of 0.08 .mu.m or less in diameter and a surface area of at least 12.5 m.sup.2 /g and which is also free of zinc metal. The small particle size zinc oxide is particularly useful as a UV absorbing/scattering additive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.