Abstract: The invention provides a process for the production of shaped bodies and semi-finished products from polyolefins in the presence of crosslink-reinforcing coagents by addition of 0.01 to 1.0 wt % of at least one organic polymer-active radical forming agent, and brief heating with shaping before radiation to above the decomposition temperature of the radical forming agent until the radical forming agent decomposes.The process serves for the production of pipes, shaped sections and sheaths by extrusion, injection molding or extrusion pressing, especially for electric insulations, in particular for cables and lines.

Abstract: In a method for the manufacture of formed elongated articles of cross-linked polyethylene in which the polyethylene is shaped in the non-cross-linked condition and is subsequently cross-linked by the application of heat in the presence of organic radical-forming agents, the improvement wherein 0.1 to 20% by weight of polyethylene of a cross-link promoting coagent selected from the group consisting of 2,4-dienoxy-6-amino-alkyl(ene)-s-triazines and N,N'-bis-(2,4-dienoxy-s-triazine-6)-diamines, is admixed with the polyethylene and is thereafter shaped and continuously cross-linked by application of heating at about atmospheric pressure and at a temperature above about 150.degree.C. and below the decomposition temperature of the components of the mixture.