Process for the production of vermiculite foil
US7321009B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 3, 2002 |
| Grant date | Jan 22, 2008 |
| Priority date | — |
| Expiry date | Aug 18, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2200/0612
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention is concerned with gasket sealing foils having a sealing layer with enhanced properties which is based upon chemically exfoliated vermiculite. The method of producing a sealing foil for gaskets is described. The method comprises the steps of: (a) the application of a wet sealing foil material to a forming sheet to form a layer, (b) partially drying the said wet sealing foil layer on the forming sheet; (c) removing the said layer from the forming sheet to form a core free gasket sealing foil; and (d) forming, preferably cutting, the layer into at least one suitable shape for use in the formation of a gasket The sealing foil comprises a resilient material, which comprises a CEV component in a proportion of at least 25% w/w of the sealing foil, the CEV component being at least partially derived from dry CEV. The sealing foil layer may be combined with a gasket support layer prior to or after the cutting step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.