Patent ID: 8728370

Claim:
A process for forming a pipe comprising the steps of: (i) forming a molding composition by admixing: (a) a thermoplastic polyolefin; (b) 0.01 to 1.0% by weight, based on the total weight of the molding composition, of an organic polyoxy compound having the chemical formula: R—[(CH 2 ) n —O] m —H wherein n is an integer in the range from 1 to 10, m is an integer in the range from 3 to 500 and R is a hydrogen atom, an OH group or an alkyl group wherein the alkyl group has from 1 to 10 carbon atoms and may bear further substituents selected from the group consisting of —OH, —COOH, —OCH 3 and —OC 2 H 5 , wherein the organic polyoxy compound has a mean molar mass in a range from 400 to 9000 g/mol; and (c) 0.1 to 5.0% by weight, based on the total weight of the molding composition, of an unsaturated aliphatic hydrocarbon compound selected from the group consisting of a polyisoprene, polyoctenamer and a polydecenamer; (ii) pelletizing the molding composition to form pellets; (iii) extruding the pellets in the form of a pipe; and (iv) crosslinking the pipe.