Abstract A gasket for effecting a liquid and/or a gas tight seal between two surfaces has at least one of two opposite surfaces coated with pressure-rupturable micro-capsules containing a liquid sealing composition. The capsules are ruptured by compression of the gasket between the two surfaces and the liquid sealing composition then hardens to form the seal. The sealing composition may consist of natural rubber, polyisoprene, polybutadiene, polybutadiene-styrene copolymer, polybutadieneacrylonitrile copolymer, polychloroprene, or a polysulphide, or the composition may consist of a polyester, a polyamide, an epoxy resin, an alkyd resin, a modified phenol-formaldehyde resin, a modified urea-formaldehyde resin, a modified melamineformaldehyde resin, a drying oil, or cashew nut oil.
A gasket as claimed in claim 1, in which the liquid sealing composition is selected from the group consisting of natural rubber, polyisoprene, polybutadiene, polybutadiene-styrene copolymer, polybutadiene-acrylonitrile copolymer, polychloroprene and polysulphide.
Claim 2
Dependent Claim
16 words
A gasket as claimed in claim 1, in which the liquid sealing composition is oxidised polybutadiene.
Claim 3
Dependent Claim
40 words
A gasket as claimed in claim 1, in which liquid sealing composition is selected from the group consisting of polyester, polyamide, epoxy resin, alkyd resin, modified phenol-formaldehyde resin, modified urea-formaldehyde resin, modified melamine-formaldehyde resin, drying oil and cashew nut oil.
Claim 4
Independent Claim
97 words
A method of producing a liquid and/or gas tight seal between two surfaces, comprising the steps of coating at least one of two opposite surfaces of a gasket with pressure-rupturable micro-capsules containing a sealing composition comprising a resin or rubber-like material which is liquid at normal ambient temperatures; positioning the coated gasket in facing relationship between said first mentioned two surfaces; and urging the said first mentioned two surfaces together thereby to rupture the micro-capsules and liberate the liquid sealing composition between the coated surface of the gasket and the first mentioned surface facing the coated surface.