Mixed metal layered hydroxide/fumed silica adducts
US5273728A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 21, 1992 |
| Grant date | Dec 28, 1993 |
| Priority date | — |
| Expiry date | Jan 21, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/22
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Fine particle silica, especially fumed silica (FS), is interacted, in aqueous medium, with a substantially crystalline mixed metal layered hydroxide (MMLH) of the formula shown below to form a novel adduct, MMLH-SiO.sub.2, as an aqueous gell which is shear-thinning and which has rapid gelation times, the said MMLH comprising the general formula EQU Li.sub.m D.sub.d T(OH)(m+2d+3+n.a)(A.sup.n)a.qH.sub.2 O (I) where: m is from zero to about 1; D represents divalent metal ions; d is from zero to about 4; T represents trivalent metal ions; A represents monovalent or polyvalent anions or negative-valence radicals other than OH-ions; a is the number of ions of A; n is the valence of A; n-a is from zero to about -3; q is zero or more; (m+d) is greater than zero; and (m+2d+3+n.a) is equal to or greater than 3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.