Abstract: The present invention refers to a process for preparing cross-linked polyolefins, comprising the steps of adding a diazido compound of the formula (I) N?N?N—X—R—X—N?N=N wherein R represents an aryl, alkyl or aralkyl group having 3 to 20 carbon atoms and X stands for —CO—, —O—CO— —SO2—, —PO2—, —PO3—, or —Si (?O)—, and a peroxide compound of the general formula (II) R1—X1—OO—X2—R2 wherein R1 and R2 are the same or different and represent hydrogen, an aryl, alkyl or aralkyl group having 3 to 20 carbon atoms and optionally comprising further peroxide groups, wherein one of R1 and R2 can form a ring, and X1 and X2 are the same or different and stand for a direct bond, —CO2— or —CO— to a polyolefin in powder or pellet form; mixing the product to obtain a mixture; extruding the mixture in an extruder at a temperature above the decomposition temperature of the diazido compound of formula (I) and of the peroxide compound of formula (II).

Abstract: The present invention refers to a process for preparing cross-linked polyolefins, comprising the steps of adding a diazido compound of the formula (I) N?N?N—X—R—X—N?N=N wherein R represents an aryl, alkyl or aralkyl group having 3 to 20 carbon atoms and X stands for —CO—, —O—CO—SO2-, —PO2-, —PO3—, or -Si (?O)—, and a peroxide compound of the general formula (II) R1-X1-OO—X2—R2 wherein R1 and R2 are the same or different and represent hydrogen, an aryl, alkyl or aralkyl group having 3 to 20 carbon atoms and optionally comprising further peroxide groups, wherein one of R1 and R2 can form a ring, and X1 and X2 are the same or different and stand for a direct bond, —CO2— or —CO— to a polyolefin in powder or pellet form; mixing the product to obtain a mixture; extruding the mixture in an extruder at a temperature above the decomposition temperature of the diazido compound of formula (I) and of the peroxide compound of formula (II).