| 摘要 |
A soft material, flat gasket having a release coating adhered thereto prepared by a process which includes: perparing a release coating composition which is a suspension including: from 69.5 to 93 parts by weight of an oil having a viscosity in excess of 100 m Paxs and a fire point in excess of 230 DEG C., which oil is one of a mineral oil, a nonreactive silicone oil, and a mixture thereof; from 5 to 20 parts by weight of a polytetrafluoroethylene powder which has a particle size of less than 5 mu ; from 0.5 to 10 parts by weight of an aqueous latex; and from 0.5 to 2 parts by weight of a wetting agent; and applying the release coating composition by coating at least a predetermined portion of at least one surface of the soft material, flat gasket therewith. In spite of the notoriously poor bonding capability of PTFE materials, the release coatings produced in this manner exhibit unexpectedly good adhesion to the gasket so that the gaskets do not release PTFE and give off their color when handled, do not loose their non-stick properties when stored over long periods of time, and can be stacked harmlessly on top of one another immediately after application of the coating.
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