Shawcor Ltd.

Amarjit Tathgur

Dilip K Tailor

Peter Jackson

Robert Edward Steele

Marcus P Heydrich

David Seepersaud

Robert E Steele

A method of applying or repairing a coating on a substrate by inductive heating. A susceptor element is applied on the coating and the element and the substrate are inductively energized to cause the substrate and the coating to be heated. The susceptor element is removed from the heated coating before applying the coating or applying a patch to the coating.

Method for applying or repairing a coating on a substrate by inductive heating

A crosslinked, predominantly polypropylene-based article comprises a silane-modified ethylene-based polyolefin, at least 50 percent by weight of a non silane-modified polypropylene, and a silane condensation catalyst. The article is moisture crosslinked to a sufficient degree that it possesses thermoset properties such that, when the article is heated to a temperature above the crystalline melting point of the non silane-modified polypropylene, it is softened but does not become liquid. The article preferably comprises a heat-shrinkable sleeve for a high-temperature transmission pipeline.

Crosslinked, predominantly polypropylene-based compositions

A moisture-crosslinkable polyolefin material, comprising a silane-grafted polyolefin blend, and coatings or insulations, including heat-shrinkable coatings and insulations, prepared therefrom. The coating material is formed by a process comprising: (a) reacting a pre-blended mixture of polyolefin and polypropylene, or higher polyolefin, resins and optional compatibilizing agent, with an appropriate silane and silane-grafting initiator to produce a silane-modified polyolefin blend composition; (b) forming the coating or insulating material by melt processing the composition produced in step (a) with a silanol condensation catalyst; and (c) crosslinking the formed coating or insulating material by exposing it to moisture, preferably at an elevated temperature.

Crosslinked compositions containing silane-modified polypropylene blends

A moisture-crosslinkable polypropylene material, comprising silane-grafted polyolefin or olefin-silane copolymer and non silane-modified polypropylene homopolymer or copolymer; and coatings or insulations, including heat-shrinkable coatings and insulations, prepared therefrom. The coating material is formed by a process comprising: (a) reacting polyolefin with a silane in the presence of a free-radical initiator to form a silane-grafted polyolefin, or copolymerizing a polyolefin with silane; (b) preparing a mixture of the silane-modified polyolefin prepared in (a) with polypropylene homopolymer or copolymer, and a silanol condensation catalyst; (c) forming the coating or insulating material by melt processing the mixture formed in step (b); and (d) crosslinking the coating or insulating material by exposing it to moisture, preferably at an elevated temperature.

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Brampton, Canada

Amarjit Tathgur