Process for the production of vermiculite foil

Details Process for the production of vermiculite foil Process for the production of vermiculite foil

2008-01-22

2008-01-22

Cain, Edward J. (Department: 1714)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C524S444000, C524S445000, C524S448000, C524S450000

Reexamination Certificate

active

07321009

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.

REFERENCES:
patent: 4762641 (1988-08-01), Denton et al.
patent: 5336348 (1994-08-01), Mindler
patent: 2122699 (1984-01-01), None
patent: WO 98/53022 (1998-11-01), None
patent: WO 01/51834 (2001-07-01), None

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