Use of organic oxyimides as radical generators in plastics, method for generating radicals in plastics and use of said method

A method of incorporating a radical generator into a plastic material comprising incorporating into said plastic material an organic oxyimide having the structural element of formula I

• wherein the radical generator is activated thermally or by irradiation,
• wherein the activation is accomplished during shaping of the plastic material or shaping of a moulding compound comprising the plastic material,
• wherein the thermal activation is accomplished at a temperature of 240° C. or more,
• said method resulting in a modification of the plastic material, wherein the modification is increasing the molecular weight of the plastic material, branching or crosslinking of the plastic material, molecular weight decrease of the plastic material, influencing a molecular weight distribution of the plastic material, and/or grafting of an unsaturated monomer onto the plastic material.