Method for preparing elongated-shaped silica sol
US5597512A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 14, 1994 |
| Grant date | Jan 28, 1997 |
| Priority date | — |
| Expiry date | Oct 14, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J13/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for preparing a silica sol having an elongated shape comprising a step (a) where an aqueous solution containing a water-soluble calcium salt or a water-soluble magnesium salt or a mixture of the water-soluble calcium salt or the water-soluble magnesium salt is mixed with an aqueous colloidal solution of an active silicic acid; a step (b) where an alkaline substance is mixed with the aqueous liquid obtained in the step (a); a step (c) where a part or the whole of the mixture obtained in the step (b) is heated at 60.degree. C. or higher to obtain a heel solution and a feed solution is prepared by a part of the mixture obtained in the step (b) or a mixture separately prepared by the step (b) and the feed solution is added to the heel solution; and a step where water is evaporated during said addition step so that SiO.sub.2 concentration is concentrated to 6 to 30% by weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.