Metal oxide/silica sols
US4613454A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 27, 1984 |
| Grant date | Sep 23, 1986 |
| Priority date | — |
| Expiry date | Sep 27, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/80
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A stable aqueous acidic metal oxide/silica sol which contains from 5-40% by weight SiO.sub.2, from 1-10.5% by weight of metal oxide, and a water-soluble anionic stabilizing compound selected from the group consisting of water-soluble anionic surfactants having an HLB greater than 8 and water-soluble carboxylic acid polymers with the ratio of metal oxide to water-soluble anionic stabilizing compound being within the range of 0.3:1 to 15:1. Also claimed is a composition and method of producing a stable alkaline metal oxide/aqueous colloidal silica sol which comprises the steps of: PA0 (a) forming a reaction mixture by mixing an hydrolyzable metal compound with an acidic, substantially ion-free collodial silica sol which contains at least 5% by weight of silica in the presence of an anionic water-soluble stabilizing compound from the group consisting of anionic water-soluble surfactants and water-soluble carboxylic acid polymers whereby the formation of metal oxide is substantially prevented and the amount of hydrolyzable metal compound is sufficient to produce at least 0.5% by weight of metal oxide based upon silica content; and PA0 (b) adjusting the pH of the reaction mixture betwee…
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