Soft material gasket and method of manufacture

Details Soft material gasket and method of manufacture Soft material gasket and method of manufacture

1989-07-05

1991-03-19

Bell, Janyce

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

277235B, 277DIG6, 427302, 427303, 427387, 428137, 428447, 428698, B32B 516

Patent

active

050010077

ABSTRACT:
Soft material flat gasket useful as an exhaust flange gasket, a cylinder head gasket or a secondary gasket for internal-combustion engines includes a porous soft material and a crosslinked impregnating agent included in the porous soft material. The crosslinked impregnating agent is comprised of a silicone resin and is the crosslinked product of at least one liquid polysiloxane having reactive hydrogen groups. Crosslinking of the at least one liquid polysiloxane proceeds in the presence of an effective amount of a catalyst, which catalyst is introduced into the porous soft material prior to introduction therein of the at least one liquid polysiloxane according to the inventive method of manufacture. Introduction of catalyst prior to polysiloxane impregnation results in the catalyst being finely distributed throughout the soft material so that subsequent crosslinking of the impregnating agent results in products that are saturated to such a degree that the impregnating agents crosslink substantially in the surface regions and the finished gaskets no longer stick to packaging material used in storage, shipping and handling, or cling to sealing faces of, for example, internal-combustion engines, after installation.

REFERENCES:
patent: 3708324 (1973-01-01), Stebleton
patent: 3749593 (1973-07-01), Keiser
patent: 3970322 (1976-07-01), Stecher et al.
patent: 4220342 (1980-09-01), Shah
patent: 4483539 (1984-11-01), Bindel et al.
patent: 4499135 (1985-02-01), Mitchell et al.
patent: 4500100 (1985-02-01), Bindel

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