Low temperature expandable vermiculite and intumescent sheet material containing same
US5079280A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1989 |
| Grant date | Jan 7, 1992 |
| Priority date | — |
| Expiry date | Nov 15, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/0081
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of decreasing the expansion temperature and improving the expansion characteristics of vermiculite ore comprising subjecting vermiculite ore containing interlamellar cations to a potassium nitrate solution for a time interval sufficient to ion-exchange interlamellar cations within said ore with potassium ions. Subsequent to this ion exchange the low temperature expandable vermiculite may be expanded by heating in an oven, or incorporated in an intumescent material and heat expanded in situ, or expanded by other heating means. An intumescent sheet is provided which may be used for mounting automotive catalytic converter monoliths comprising an unexpanded vermiculite produced by the method of the invention; an inorganic fibrous material; and a binder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.