Goetze Ag

Franz-Josef Giesen

Klaus-Peter Majewski

Hans-Rainer Zerfass

Klaus Lonne

Karl-Heinz Maus

Heribert Bechen

Rudiger Voigt

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.

Soft material gasket and method of manufacture

A flat sealing gasket includes a mat of non-woven material having opposite faces; a polymerized impregnating agent distributed with the material and an overlay on at least one of the mat faces. The overlay which comprises a hardened, pressure-resistant polymer material is sunken into the mat to a substantial extent of the mat thickness.

Cylinder head gasket having overlays in end zones

A sealing ring, having a ring body made, for example, of high-temperature resistant compressed metal fibers includes a roughened surface adapted to be pressed against and displaced by sliding relative to a counter-face.

Sealing ring

A soft substance gasket material preferably made of a metal reinforced fiber mat is impregnated with a silicone impregnating agent comprising a mixture of a polysiloxane having reactive hydrogen groups such as a polyhydrogen siloxane, an addition cross-linking polysiloxane such as a methyl vinyl siloxane, and cross-linking catalysts, preferably in the form of only one organic metal compound. In spite of having small quantities of addition cross-linking polysiloxane and cross-linking catalysts, the impregnated seals are not tacky after cross-linking, they are easy and inexpensive to manufacture, and they evidence improved functional characteristics such as improved resistance to hot media, temperature and aging when compared with seals impregnated with only one type of polysiloxane.

Impregnated soft substance gasket

An impregnated, soft, flat sealing gasket and a method of manufacturing same which includes the steps of impregnating a fiber mat with a liquid, cross-linkable silicone impregnating agent which includes a cross-linking agent which forms radicals under the influence of heat; heating the silicone-impregnated fiber mat to cause at least partial cross-linking of the silicone impregnating agent; and irradiating the impregnated fiber mat with high energy radiation to cause cross-linking of the silicone impregnating agent present therein, whereby the silicone impregnating agent present in surface regions of the flat sealing gasket is cross-linked to a greater degree than obtainable by thermal treatment alone.

Impregnated, soft, flat gasket and manufacturing method

An impregnated soft, flat sealing gasket made by a process including the consecutive steps of preparing a gasket material selected from the group consisting of organic fibers, inorganic fibers, synthetic fibers and mixtures thereof and a binder; forming a fiber mat from the gasket material; impregnating the fiber mat with a cross-linkable impregnating agent and at least partly cross-linking the impregnating agent in the fiber mat; and adding to the fiber material, in a fine distribution therein, a duromer synthetic resin prior to the impregnating step and as early as simultaneously with the preparing step.

Impregnated soft, flat gasket and manufacturing method

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 Pa.times.s and a fire point in excess of 230.degree. 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.

Growing community of inventors

Odenthal, Germany

Franz-Josef Giesen