Adhesive in capsule coated gasket

Claim 2

A gasket as set forth in claim 1 wherein said wet tacky sealant is a viscous material which flows under pressure and which is resistant to water, oil and anti-freeze materials used in the cooling systems of internal combustion engines.

Claim 3

A gasket as set forth in claim 1 wherein said layer is about 0.005 inch thick.

Claim 4

A gasket as set forth in claim 1 wherein said capsules range in size from about 10 microns to 100 microns.

Claim 5

A gasket as set forth in claim 1 wherein said capsules have a maximum size of about 100 microns and have a size distribution of at least 90 percent less than 80 microns and at least about 50 percent between 35 and 55 microns.

Claim 6

A gasket as set forth in claim 6 wherein each capsule comprises about 10 percent wall material and 90 percent wet sealant.

Claim 7

A gasket as set forth in claim 1 wherein said coating is capable of withstanding a compressive load of about 1,000 p.s.i. before said capsules burst to release said sealant.

Claim 8

A gasket as set forth in claim 1 wherein said coating includes a thixotropic agent upon application.

Claim 9

A gasket for sealing the confronting faces of a pair of metal members having passageways therethrough comprising a gasket having openings therein which register with said passageways when placeD between said faces, said gasket having a coating thereon comprising a uniform dispersion of capsules in a dry adherent layer of a vehicle-binder, each of said capsules having a pressure rupturable outer wall formed of a gelled film-forming colloid material deposited around a necleus of wet tacky sealing material by coacervate forces, said capsules extending to the surface of said coating and being retained in situ by said adherent layer of vehicle-binder, said capsules being present in such abundance as to burst and thereby permit said wet tacky sealant to flow throughout the surface of the gasket when subjected to the predetermined compressive load.

Claim 10

A gasket as set forth in claim 10 wherein said layer is between 0.001 and 0.005 inch thick, said capsules range in size from 10 to 100 microns and a size distribution of at least 90 percent less than 80 microns and at least 50 percent between 35 and 55 microns, each capsule comprises approximately 10 percent wall material and 90 percent wet sealant by weight, and said coating includes a thixotropic agent upon application.