Patent ID: 7056987

Claim:
An extrudate which is obtained by the process consisting essentially of the steps of: (a) adding a diazido compound of the formula (I) N═N═N—X—R—X—N═N═N (I), wherein R represents an aryl, alkyl or aralkyl group having 4 to 20 carbon atoms and X stands for —CO—, —O—CO—, —SO 2 —, —PO 2 — or —Si (═O)—; and a peroxide compound of the general formula (II) R 1 —X 1 —OO—X 2 —R 2 (II) wherein R 1 and R 2 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 R 1 and R 2 is not hydrogen and wherein R 1 and R 2 can form a ring, and X 1 X 2 are the same or different and stand for a direct bond, —CO 2 —, or —CO—, to a polyolefin, the ratio of the diazido compound to the peroxide compound, wherein the diazido compound and the peroxide compound are expressed in ppm relative to the polyolefin, is within the range of 1.0 to 4.0; (b) mixing the components of step (a) to obtain a mixture; (c) extruding the mixture obtained in step (b) in an extruder at a temperature above the decomposition temperature of the diazido compound of formula (I) and above the decomposition temperature of the peroxide compound of formula (II).