Process for repairing plastic coatings on metal pipes

Details Process for repairing plastic coatings on metal pipes Process for repairing plastic coatings on metal pipes

C - Chemistry, Metallurgy

08

L

C08L 23/14 (2006.01) C08F 210/06 (2006.01) F16L 58/10 (2006.01)

Patent

CA 2099411

Parts of coatings made of plastic material on metal pipes, that have either been removed or damaged, are repaired by using one or more segments of a hollow cylinder having an inside radius equal to the outside radius of the metal pipe and an outside radius equal to the sum of the outside radius of the metal pipe plus a length from 80% to 120% of the thickness of the coating, said hollow cylinder segments being made up of a polymer composition, preferably foamed, comprising (percentages by weight): A) from 92% to 100% of a thermoplastic polymer selected from polypropylene; crystalline copolymers of propylene containing from 2% to 25% in moles of ethylene and/or C4- C10 .alpha.-olefins; heterophasic compositions comprising said polypropylene or crystalline copolymers of propylene in combination with one or more elastomeric olefin copolymers; B) from 0% to 8% of a filler having the function of blocking UV radiation.

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