Heat-recoverable composition and article
AssigneeTyco Electronics Corporation
InventorsSirarpi Bicakci-Jenkins, Abboud L. Mamish
Life of this patent
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Abstract
Disclosed is an adhesive composition suitable for bonding to a polymeric material and steel. The composition comprises specified proportions of a maleic anhydride-modified propylene-ethylene copolymer resin, a maleic anhydride-modified polyethylene, a polyisobutylene, a terpolymer comprising ethylene, propylene and a non-conjugated diene, and a hydrocarbon resin tackifier. The composition is useful in preparing a heat-recoverable article that is used to provide a protective coating on the joints of a steel pipeline. Also provided is a single sleeve or two-sleeve system for application to the joints of a coated steel pipeline operating at temperatures up to 120° C.
Claims16
An adhesive composition suitable for sealing to a substrate selected from the group consisting of polymeric materials and steel, said composition comprising
- (a) An amount of from about 20 to about 60% by weight of a maleic anhydride-modified propylene-ethylene copolymer resin;
- (b) An amount of from about 15 to about 40% by weight of a maleic anhydride-modified polyethylene;
- (c) An amount of from about 5 to about 20% by weight of a polyisobutylene;
- (d) An amount of from about 5 to about 20% by weight of a terpolymer comprising ethylene, propylene and a non-conjugated diene;
- and
- (e) An amount of from about 10 to about 30% by weight of an inert thermoplastic hydrocarbon resin tackifier formulated from a mixture of aromatic and aliphatic feedstocks.
An assembly comprising:
- (a) a substrate that is a steel pipe partially coated with a polypropylene;
- (b) at least one first layer bonded to at least the polypropylene coating of the polypropylene-coated steel pipe, said first layer comprising a first polymeric backing and a second layer thereon comprising a first adhesive composition, said second layer comprising the first adhesive composition bonded to the polypropylene coating;
- and
- (c) at least one third layer bonded to the first polymeric backing of the first layer and bonded to the steel pipe that is not coated with the polypropylene, the third layer comprising a second polymeric backing and a fourth layer comprising a second adhesive composition on the second polymeric backing, said fourth layer comprising the second adhesive composition bonded to the first polymeric backing of the first layer and to the steel pipe that is not coated with the polypropylene.
Dependencies are inferred from the claim text.